CN110642481B - Domestic sewage integrated treatment system suitable for villages and treatment method thereof - Google Patents

Domestic sewage integrated treatment system suitable for villages and treatment method thereof Download PDF

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CN110642481B
CN110642481B CN201911066860.4A CN201911066860A CN110642481B CN 110642481 B CN110642481 B CN 110642481B CN 201911066860 A CN201911066860 A CN 201911066860A CN 110642481 B CN110642481 B CN 110642481B
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water
solid
artificial wetland
type artificial
liquid separation
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CN110642481A (en
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陈垚
朱嘉运
袁绍春
李迪
寇德会
冯力柯
成婷
叶利兰
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Chongqing Jiaotong University
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • C02F1/283Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/105Phosphorus compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/04Disinfection
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/32Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae

Abstract

The invention discloses a domestic sewage integrated treatment system suitable for villages, which comprises a feeding solid-liquid separation unit, wherein a feeding hole is formed in the feeding solid-liquid separation unit and is used for being connected with a sewage inlet pipeline; an anaerobic treatment unit is arranged at a corresponding position on the lower part of one side of the feeding solid-liquid separation unit, and the water inlet end of the anaerobic treatment unit is connected with the water outlet end of the feeding solid-liquid separation unit; a vertical undercurrent type artificial wetland and a horizontal undercurrent type artificial wetland are arranged over the anaerobic treatment unit, the water outlet end of the anaerobic treatment unit is connected with the water inlet end of the vertical undercurrent type artificial wetland through a pipeline and a suction device arranged on the pipeline, and the water outlet end of the vertical undercurrent type artificial wetland is connected with the water inlet end of the horizontal undercurrent type artificial wetland. The invention also discloses a domestic sewage treatment method suitable for villages; the invention has the advantage of improving the sewage treatment quality.

Description

Domestic sewage integrated treatment system suitable for villages and treatment method thereof
Technical Field
The invention belongs to the technical field of sewage treatment in the technical field of environmental protection, and particularly relates to a domestic sewage integrated treatment system suitable for villages and a treatment method thereof.
Background
With the development of economic society and the improvement of the living standard of people, the urbanization process of China is continuously accelerated, but the number of rural population is large, the water consumption in rural areas is also increased, the total discharge amount is large, and reports show that the total discharge amount of the rural sewage of China can reach nearly 300 hundred million tons in 2020. Urban areas are centralized in population, sewage can be uniformly collected and transported to a sewage treatment plant for treatment, but the mode relates to a large number of collecting pipe networks and is not suitable for rural areas with dispersed population and small domestic sewage amount. The rural distributed sewage has the characteristics of dispersed sources, small discharge amount, large change of water quality and water quantity of the sewage and the like, and the eutrophication of rivers and lakes can be easily caused if the rural distributed sewage is directly discharged due to higher ammonia nitrogen and organic matter content. Partial untreated rural domestic sewage is discharged randomly, various pollution accidents are caused, the good ecological environment of the rural area is damaged, and the drinking water source safety of rural population is more likely to be threatened, so that the decentralized sewage treatment of the rural area by utilizing the existing sewage treatment technology is urgent. The core of the 'toilet revolution' is the treatment of excrement, and the harmless treatment and resource utilization of the excrement are promoted.
Although the rural domestic sewage treatment technology has various forms and mature process, the purpose of controlling rural water pollution can be really achieved only by the sewage treatment technology which is suitable for local conditions. Rural sewage mainly has the following characteristics: the water is relatively dispersed and has small water amount. General rural farmers live more dispersedly, and the number of people of single family is relatively few, and the volume of domestic sewage that produces is also less, and the concentration of pollutant in domestic sewage is also lower. ② the coefficient of variation is large. Villagers have consistent life rules, the discharge amount of sewage is larger in the morning, at noon and at night than in other daytime, the discharge amount at night is small, even the cutoff condition can occur, and the characteristics of large change range and discontinuity are realized. And collecting is difficult. Domestic sewage in rural areas is discharged dispersedly, most of the domestic sewage is not provided with a drainage pipe network, and the collection difficulty is high. Fourthly, the rural areas have weak technical and economic foundation and lack of funds and professional technicians, and the daily operation and maintenance of sewage treatment facilities are difficult to ensure. The characteristics of rural domestic sewage cause difficulty and serious treatment in standardization, only less than 10% of rural domestic sewage is treated in the country at present, the treatment rate is low, improvement is urgently needed, and huge funds can be spent on constructing sewage pipe networks in most rural areas far away from cities and towns.
The 'rural human settlements environment renovation three-year action scheme' provides four modes of strengthening treatment facilities and pipeline construction in regions such as population gathering regions, central town collections, ecological functional regions and the like, and popularizing according to local conditions according to the actual conditions such as region positions, population gathering degrees and the like: first, bring into town sewage pipe network and administer the mode, mainly concentrate relatively, the comparatively perfect system town of pipe network construction to population distribution, through extending sewage pipes, bring into pipe network unified processing with the peripheral village domestic sewage that is close of town distance. And the second is a joint management mode, which mainly aims at villages with relatively large population, centralized distribution and far distance from centralized towns, takes the whole village, the whole group or tens of peasant households as a unit, lays regional sewage discharge pipelines, and treats rural domestic sewage in a mode of sewage treatment integrated equipment and the like. And thirdly, a single-household treatment mode is adopted, and mainly aiming at remote villages with relatively few population and relatively dispersed distribution, sewage treatment facilities are built to treat single-household domestic sewage. And fourthly, the artificial wetland sewage treatment mode combines farmland irrigation, ecological protection restoration and environmental landscape construction to promote sewage resource utilization and realize the win-win of domestic sewage treatment, ecological agriculture development and rural ecological civilization construction.
Chinese patent application (CN105481203A) discloses a domestic sewage treatment system, in the technical scheme disclosed in the patent application, grids are arranged at the position corresponding to the outlet end of a sewage collecting pipe on a pre-settling tank and the position corresponding to the inlet end of an overflow pipe on the pre-settling tank for solid-liquid separation, the solid-liquid separation structure cannot well separate solid from liquid, and the separated solid part still carries a large amount of liquid components, so that the sewage treatment capacity is greatly reduced. Chinese patent (CN204939208U) discloses a circulation type domestic sewage purification system, in the technology of the patent, sewage after anaerobic treatment is uniformly distributed at the lower end of an artificial wetland by adopting a pipeline, the structure is relatively complex and the sewage distribution is not uniform enough, so that the artificial wetland can not well exert the effect of purifying the sewage. In the above technology, the sewage is sent to the artificial wetland for treatment in an anaerobic or anaerobic state after anaerobic treatment, and the artificial wetland cannot efficiently and thoroughly treat the sewage (adsorption, oxidation reduction, microbial decomposition, nutrient absorption and the like).
Therefore, it is a technical problem to be solved by those skilled in the art how to provide an integrated domestic sewage treatment system and a treatment method thereof, which has a more compact structure, can improve the quality and capacity of sewage treatment, and can better separate sludge and fecal sewage in domestic sewage of villages.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a domestic sewage integrated treatment system which has a more compact structure, can improve the sewage treatment effect and the sewage treatment capacity and is suitable for villages and a treatment method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
an integrated domestic sewage treatment system suitable for villages comprises a feeding solid-liquid separation unit, wherein a feeding hole is formed in the feeding solid-liquid separation unit and is used for being connected with a sewage inlet pipeline; the device is characterized in that an anaerobic treatment unit is arranged at a corresponding position on the lower part of one side of the feeding solid-liquid separation unit, the water inlet end of the anaerobic treatment unit is connected with the water outlet end of the feeding solid-liquid separation unit, and a filler is arranged in the anaerobic treatment unit; the vertical undercurrent type artificial wetland and the horizontal undercurrent type artificial wetland are arranged over the anaerobic treatment unit, the vertical undercurrent type artificial wetland and the horizontal undercurrent type artificial wetland are respectively filled with fillers and planted with plants, the water outlet end of the anaerobic treatment unit is connected with the water inlet end of the vertical undercurrent type artificial wetland through a pipeline and a suction device arranged on the pipeline, the water outlet end of the vertical undercurrent type artificial wetland is connected with the water inlet end of the horizontal undercurrent type artificial wetland, and the water outlet end of the horizontal undercurrent type artificial wetland is used for discharging water.
Thus, when the integrated domestic sewage treatment system works, the domestic sewage of the village is collected and then flows into the feeding solid-liquid separation unit, the anaerobic treatment unit, the vertical subsurface flow type artificial wetland and the horizontal subsurface flow type artificial wetland from the sewage inlet pipe in sequence; the feeding solid-liquid separation unit can separate solid components and liquid components in the domestic sewage, so that the separated sewage continuously enters the anaerobic treatment unit, and when the anaerobic treatment unit treats the sewage, complex organic matters in the sewage are degraded and converted into simple organic matters, and organic pollutants, pathogenic bacteria, partial nitrogen and partial phosphorus in the domestic sewage are removed; then flows into the vertical undercurrent type artificial wetland and the horizontal undercurrent type artificial wetland for treatment. When the artificial wetland is treated, the filler arranged in the artificial wetland can be used for the implantation of biological bacteria, and can perform the functions of adsorption, detention, filtration, oxidation reduction, precipitation, microbial decomposition, transformation, plant shielding, residue accumulation, transpiration of water and nutrient absorption on pollutants to achieve the purification effect; in addition, the oxygen delivery function of partial wetland plant roots and the different flow states and oxygen containing conditions of the sewage at different positions of the artificial wetland change, so that the water flow can undergo sufficient aerobic and anaerobic alternate treatment processes when flowing in the artificial wetland. The coexistence of the aerobic and anaerobic conditions provides different suitable niches for the aerobic, facultative anaerobic and anaerobic microorganisms in the root zone, and further degradation and conversion of pollutants are promoted. Especially, the artificial wetland system plays a unique role in sewage treatment due to the nitrification and denitrification in the sewage denitrification process, the packing layer and the root system of the plant respectively have adsorption and absorption effects on the total phosphorus in the water, and the sewage treatment quality can be better improved. Finally, the water treated by the artificial wetland becomes clear and is discharged after realizing harmlessness. Therefore, the treatment system has the characteristics of realizing the shunting of excrement and sewage, returning of excrement to the field, recycling of reclaimed water, synergistic removal of pollutants and the like, and can obtain a good treatment effect under the condition of low cost; and the fresh water resources can be prevented from being damaged, and the effect of protecting the environment is achieved. The layout mode of the processing system enables the structure to be more compact; the whole treatment process can improve the sewage treatment quality and the sewage treatment capacity.
As optimization, the anaerobic treatment unit comprises a first anaerobic treatment unit, a second anaerobic treatment unit and a third anaerobic treatment unit which are spaced from each other and arranged side by side in the horizontal direction; the upper end of the first anaerobic treatment unit is a water inlet end and is connected with the water outlet end of the feeding solid-liquid separation unit, the lower end of the first anaerobic treatment unit is a water outlet end and is connected with the water inlet end at the lower end of the second anaerobic treatment unit, the upper end of the second anaerobic treatment unit is a water outlet end and is connected with the water inlet end at the upper end of the third anaerobic treatment unit, and the lower end of the third anaerobic treatment unit is a water outlet end and is connected with the water inlet end of the suction device.
Therefore, the anaerobic treatment unit is set into an anaerobic treatment first unit, an anaerobic treatment second unit and an anaerobic treatment third unit, the water treatment residence time is prolonged by skillfully utilizing the spatial layout, and meanwhile, a plurality of anaerobic treatment units which are separated by most can well shield oxygen at two ends from entering, so that a very stable and lasting anaerobic area is formed in the center of the anaerobic treatment units, and the reliability and the stability of the anaerobic treatment are ensured. Can pertinently carry out anaerobic fermentation denitrification treatment on organic matters in the domestic sewage, provide sufficient conditions for subsequent aerobic nitrification treatment and better ensure the stability of sewage treatment quality.
Furthermore, a sludge discharge pipe is arranged at the lowest position of the bottom of the anaerobic treatment unit and is connected with an external sludge storage pool. So that the anaerobic treatment device can be opened periodically and used for draining sludge accumulated at the bottom of the anaerobic treatment unit to avoid blockage.
Preferably, the suction device is a submersible sewage pump.
Therefore, the submersible sewage pump is used as the suction device, and the submersible sewage pump has the advantages of being not easy to block, simple in structure and convenient to use.
As optimization, a first water tank is arranged on one side of the anaerobic treatment unit, and the water inlet end of the first water tank is connected with the water outlet end of the anaerobic treatment unit; the submersible sewage pump is arranged at the bottom of the first water tank, a liquid level detection probe is arranged on the side wall of the first water tank, and the liquid level detection probe is connected with the electric control end of the submersible sewage pump and is used for controlling the start and stop of the submersible sewage pump according to whether the detected liquid level reaches or not; a second water tank is arranged above the first water tank at intervals, and a jet aerator is arranged between the first water tank and the second water tank; the jet aerator is provided with a liquid inlet pipeline connected with the water outlet end of the submersible sewage pump, an air inlet pipeline communicated with the outside air and a jet outlet pipeline communicated with the second water tank; the water outlet end of the second water tank is upwards connected with the vertical subsurface flow type artificial wetland.
Therefore, after the domestic sewage flows into the first water tank after being treated, when the liquid level in the first water tank reaches a preset value, the liquid level detection probe is triggered and controls the submersible sewage pump to work and pump the sewage to the aerator, the sewage is fully mixed with the air in the jet aerator to achieve the purpose of reoxygenation, then the sewage enters the second water tank from the water outlet end of the aerator through jet flow, and the air and the liquid are fully mixed in the second water tank to achieve full reoxygenation. After reoxygenation treatment, enough oxygen components can be provided for subsequent sewage treatment, so that an aerobic treatment area is formed subsequently, and the sewage treatment quality is improved. When sewage after reoxygenation treatment is treated in a subsequent vertical subsurface flow type artificial wetland, an aerobic treatment area beneficial to aerobic bacteria propagation is formed in a space area where filter fillers and plant root systems are mixed in the vertical subsurface flow type artificial wetland, so that the sewage simultaneously has the comprehensive treatment effects of filler adsorption, plant root system absorption and aerobic nitrification treatment, and pollutants in the sewage can be better adsorbed, retained, filtered, oxidized and reduced, precipitated, decomposed by microorganisms, transformed, shielded by plants, accumulated by residues, transpired water and absorbed by nutrients, so that a better purification effect is achieved.
And optimally, a plurality of uniformly distributed water outlets are arranged on the upper end surface of the second water tank and communicated with the bottom of the vertical undercurrent type artificial wetland for water inlet.
Therefore, the second water tank has multiple functions of isolating the anaerobic area below to ensure the anaerobic environment effect, fully mixing air and liquid to ensure the subsequent aerobic treatment effect and uniformly distributing water to the vertical undercurrent type artificial wetland above to reduce the impact of water flow on plant roots and the like. When sewage flows into the vertical undercurrent type artificial wetland from the second water tank during working, the plurality of water outlets which are uniformly distributed are arranged on the upper end surface of the second water tank, so that the sewage can more uniformly enter the vertical undercurrent type artificial wetland, and the treatment effect of the vertical undercurrent type artificial wetland is improved.
As optimization, the vertical subsurface flow type artificial wetland comprises a vertical subsurface flow type artificial wetland first unit, a vertical subsurface flow type artificial wetland second unit and a vertical subsurface flow type artificial wetland third unit which are mutually independent and are arranged side by side in the horizontal direction, wherein the lower end of the vertical subsurface flow type artificial wetland first unit is provided with a bottom overflow hole and is connected with the water outlet end of the second water tank; the upper end of the first vertical undercurrent type artificial wetland unit is a water outlet end and is connected with the water inlet end at the upper end of the second vertical undercurrent type artificial wetland unit, and the lower end of the second vertical undercurrent type artificial wetland unit is a water outlet end and is connected with the water inlet end at the lower end of the third vertical undercurrent type artificial wetland unit; and the three units of the vertical undercurrent type artificial wetland are connected with the water inlet end of the horizontal undercurrent type artificial wetland.
Therefore, the vertical undercurrent type artificial wetland is set into a vertical undercurrent type artificial wetland first unit, a vertical undercurrent type artificial wetland second unit and a vertical undercurrent type artificial wetland third unit, so that pollutants in sewage can be treated in a targeted manner, and the sewage treatment quality is improved. Specifically, the sewage enters the second water tank for aeration reoxygenation after being subjected to denitrification treatment by the anaerobic treatment unit (enters the second water tank after being subjected to aeration reoxygenation). The sewage and the air are mixed and are rich in oxygen, then enter the vertical undercurrent type artificial wetland, and then sequentially go back and forth up and down to pass through the three units of the vertical undercurrent type artificial wetland, the vertical undercurrent type artificial wetland is in a structural state that the filler is mixed with the plant root system, and the vertical undercurrent type artificial wetland is favorable for the implantation and propagation of water treatment microorganisms in the filler and the plant root system. Therefore, the sewage flows through a longer path in the vertical undercurrent type artificial wetland, the area stage when the sewage just enters is an aerobic treatment area with higher oxygen content, the biological filtration is carried out by microorganism aerobic bacteria with higher oxygen content, and the treatment effect is improved by combining the filler filtration and the plant root system absorption. Then, the sewage continuously flows in the vertical undercurrent type artificial wetland, the oxygen component in the sewage is gradually consumed and reduced, so that the water treatment environment gradually transits from aerobic to anoxic along the sewage flow path, and the implanted bacteria in the filler are gradually changed into micro aerobic bacteria or facultative aerobic bacteria (a vertical undercurrent type artificial wetland second unit) with lower oxygen demand from aerobic bacteria (a vertical undercurrent type artificial wetland first unit) to anaerobic bacteria (a vertical undercurrent type artificial wetland third unit). The structure of the three vertical subsurface flow type constructed wetland units can greatly enrich water treatment environments with different oxygen demands; meanwhile, the anaerobic treatment unit in the previous treatment process is combined, so that the sewage macroscopically forms anaerobic treatment, aerobic treatment and anaerobic treatment in sequence, a macroscopic treatment process of denitrification, nitrification and denitrification is formed, and the requirement of organic matter degradation is met. And the absorption and transformation of plant roots are combined, so that the water treatment effect is greatly improved.
And as optimization, the system also comprises a reoxygenation tank arranged between the vertical undercurrent type artificial wetland and the horizontal undercurrent type artificial wetland, wherein the water inlet end of the reoxygenation tank is positioned below the water outlet end of the vertical undercurrent type artificial wetland, a distance for the water outlet end of the vertical undercurrent type artificial wetland to drop water is formed between the water inlet end of the reoxygenation tank and the water outlet end of the horizontal undercurrent type artificial wetland, and the water outlet end of the reoxygenation tank is connected with the water inlet end of the horizontal undercurrent type artificial wetland.
Therefore, the effluent at the water outlet end of the vertical subsurface flow type artificial wetland can be fully mixed with air when falling in a water curtain shape and then enters the reoxygenation tank, and can be in a thin layer water flow in the reoxygenation tank, so that the atmospheric reoxygenation is rapid. And the water flow is reoxygenated again by the reoxygenation tank, so that the treatment effect can be better improved after the reoxygenation tank enters the horizontal undercurrent type artificial wetland.
For further optimization, the water outlet end of the reoxygenation tank and the water inlet end of the horizontal undercurrent type artificial wetland are positioned at the middle position in the height direction of one side of the area where the horizontal undercurrent type artificial wetland is positioned, and the water outlet end of the horizontal undercurrent type artificial wetland is positioned at the upper end position in the height direction of the other side of the area where the horizontal undercurrent type artificial wetland is positioned.
Therefore, the water flow supplemented with oxygen again by the reoxygenation tank enters from the middle position of the horizontal undercurrent type artificial wetland, so that the lower part of the horizontal undercurrent type artificial wetland is an area with poor water body fluidity and is beneficial to anaerobic and immotile bacteria implantation, and the middle upper part of the horizontal undercurrent type artificial wetland is an aerobic area and the whole fluidity of the horizontal undercurrent type artificial wetland is slow. Therefore, aerobic and anaerobic alternate treatment areas can be formed in the horizontal undercurrent type artificial wetland again, and the implantation environment provided for water treatment bacteria in each area is different from that of the vertical undercurrent type artificial wetland on the whole due to the slow water body fluidity, so that the appropriate niches provided for more types of aerobic, facultative anaerobic and anaerobic microorganisms are formed in the plant root system and the filler. Therefore, the arrangement of the horizontal undercurrent type artificial wetland can further improve the overall water treatment effect of the system and improve the sewage treatment quality. Meanwhile, in the horizontal undercurrent type artificial wetland, secondary sedimentation before water discharge can be formed after the water flow speed is slowed, and the clarity of the discharged water is ensured.
As optimization, a layer of zeolite-loaded copper oxide antibacterial filler is paved on the top layer of the filler in the horizontal undercurrent type constructed wetland.
Therefore, SS can be removed by filtering the antibacterial filler when water flows through the filler top layer of the horizontal undercurrent type artificial wetland, and the zeolite can further remove phosphorus in sewage and efficiently kill pathogenic bacteria for disinfection.
As optimization, the device also comprises a post-treatment unit connected with the water flow in the horizontal undercurrent type artificial wet water outlet end, and the water outlet end of the post-treatment unit is connected with a water outlet pipe to form a water outlet end; the post-treatment unit is filled with activated carbon.
Therefore, the activated carbon is arranged in the post-treatment unit, impurities in water are adsorbed and removed by the activated carbon when water flows through the post-treatment unit, so that the effluent is clean and limpid and is discharged through a drain pipe connected with the water outlet end of the post-treatment unit.
Preferably, the feeding solid-liquid separation unit comprises a solid-liquid separation pipe which is obliquely arranged, an excrement collecting pool is arranged below the solid-liquid separation pipe, the upper part of the upper end of the solid-liquid separation pipe is obliquely upwards opened and is just opposite to and connected below the discharge end of the sewage inlet pipeline, the lower end of the solid-liquid separation pipe is provided with an end separation grid and forms a water outlet end, and a water collecting barrel is connected below the lower end of the corresponding solid-liquid separation pipe; the upper end of the water collecting barrel is hung at the lower end of a first rope, and the other end of the first rope is connected with the upper end of the solid-liquid separation pipe downwards after respectively bypassing a first fixed pulley positioned above the water collecting barrel and a second fixed pulley positioned at the upper end of the solid-liquid separation pipe; the lower end of the water collecting barrel is provided with a water outlet hole, an automatic water outlet control device capable of controlling water outlet at intervals is arranged at the water outlet hole, and the lower end of the solid-liquid separation pipe is connected with the lower end of a vertical second rope to enable the solid-liquid separation pipe to be rotatably positioned in the feeding solid-liquid separation unit; after a certain amount of solid components are accumulated in the solid-liquid separation pipe, the upper end of the solid-liquid separation pipe can rotate downwards under the action of self weight and the water collection barrel after water outlet is pulled upwards through the first rope, the upper end of the solid-liquid separation pipe rotates downwards to a downward inclined state and slides the solid components accumulated in the solid-liquid separation pipe out of the end opening to the excrement collection tank below, and after the solid components in the solid-liquid separation pipe slide out, the water collection barrel can pull the upper end of the solid-liquid separation pipe back to an upward inclined state through the first rope; a vertical third rope is also arranged in the feeding solid-liquid separation unit, and the lower end of the third rope is connected with the water collecting barrel and used for limiting the downward limiting position of the water collecting barrel.
Therefore, when the feeding solid-liquid separation unit works, domestic sewage flows through the sewage inlet pipeline after being collected, flows out of the outlet end of the sewage inlet pipeline and flows into the sewage inlet pipeline from the opening at the upper end of the solid-liquid separation pipe. After the domestic sewage flows into the solid-liquid separation pipe, the solid-liquid separation pipe intercepts and accumulates solid components in the domestic sewage in the solid-liquid separation pipe, and liquid components in the domestic sewage flow out of a water outlet end formed at the lower end of the solid-liquid separation pipe and are collected in the water collection barrel. When a certain amount of solid components are accumulated in the solid-liquid separation pipe, the sewage collected in the water collecting barrel reaches a certain amount, and the automatic water outlet control device arranged at the water outlet controls the water outlet to discharge water. Sewage in the water collecting barrel is emptied or a certain amount is discharged, and simultaneously solid components in the solid-liquid separation pipe are accumulated to a certain amount to ensure that the two ends of the first rope are unbalanced, the upper end of the solid-liquid separation pipe can rotate downwards under the action of self weight and pull up the water collecting barrel after water is discharged through the first rope, and the upper end of the solid-liquid separation pipe rotates downwards to an inclined downward state and slides out the solid components accumulated in the solid-liquid separation pipe to the excrement collecting tank below from the end opening. After solid components in the solid-liquid separation pipe slide out, the water collecting barrel can pull the upper end of the solid-liquid separation pipe back to an upward inclined state through the first rope, so that the two ends of the first rope are restored to the original balance state. After the domestic sewage enters the solid-liquid separation pipe, the solid-liquid separation pipe continuously performs solid-liquid separation on the domestic sewage entering the solid-liquid separation pipe until the solid-liquid separation pipe slides the collected solid components out of the end opening to the excrement collecting tank below, so that the solid-liquid separation of the domestic sewage is continuously performed, sludge and excrement in the village domestic sewage can be better separated, and the sewage treatment quality is improved.
During specific implementation, the feeding solid-liquid separation unit can also adopt a direct inclined grid, so that the waste to be treated falls onto the grid and slowly slides downwards, liquid of the waste is filtered to the lower part of the grid along the grid in the sliding process, and the solid part slides out to the front along with the grid, so that solid-liquid separation is realized. The solid-liquid separation unit has simpler structure and low cost. However, in particular use, the residence time of the waste on the grid cannot be controlled, often resulting in a very short time during which the liquid slides down the grid along with the solid fraction without having to be filtered. Resulting in poor solid-liquid separation effect and difficult control. When the solid-liquid separation unit is used, the solid part can stay in the solid-liquid separation pipe all the time, and the liquid part is filtered out slowly, so that the solid-liquid separation unit has a very good solid-liquid separation effect.
As optimization, the lower part of the solid-liquid separation pipe is axially provided with an internal separation grid, so that the upper part of the separation grid forms a solid part accumulation space, and the lower part of the separation grid forms a sewage convergence space.
Therefore, after domestic sewage waste (mainly excrement) and the like flow into the solid-liquid separation pipe, the waste firstly enters a solid part accumulation space formed at the upper part of a separation grid in the solid-liquid separation pipe, the separation grid can separate a solid part and a liquid part in the domestic sewage, and the liquid part after separation enters the lower part of the separation grid to form a sewage convergence space and flows out from a water outlet end of the solid-liquid separation pipe. Therefore, the solid-liquid separation can be carried out immediately after the waste falls into the solid-liquid separation pipe, so that the solid-liquid separation efficiency of the solid-liquid separation pipe can be improved, and the solid-liquid separation quality can be improved.
And as optimization, non-adhesive materials are coated and arranged in the inner cavity of the solid-liquid separation pipe and on the surface of the separation grid.
(preferably applied using a nanomaterial).
Therefore, when solid-liquid separation is carried out, the solid part and the liquid part can be better separated, and when the solid part is poured into the excrement collecting pool from the solid-liquid separation pipe, the solid part is not easy to adhere to the inner cavity of the solid-liquid separation pipe, so that the advantage of more conveniently realizing solid-liquid separation is achieved.
As optimization, a vertical guide sliding fit structure is additionally arranged between the two sides of the water collecting barrel and the inner cavity wall of the feeding solid-liquid separation unit.
Like this, increase vertical direction sliding fit structure between sump drum both sides and the feeding solid-liquid separation unit inner chamber wall for when solid-liquid separation pipe upper end downwardly rotated and upwards pulled up the sump drum after going out water through first rope and when the vertical downstream of sump drum draws the solid-liquid separation pipe upper end back to the tilt up state through first rope, the vertical operation of sump drum is more steady.
As an optimization, the automatic water outlet control device is a water liner arranged corresponding to the water outlet holes and used for controlling the water outlet holes to discharge water at intervals.
Like this, set up automatic water control device into current water courage that falls, have simple structure, advantage easy to assemble use.
Preferably, a water inlet channel is arranged at the position corresponding to the water outlet hole at the lower end of the water collecting barrel, the water inlet channel is of a flat box structure as a whole, the upper end and one side of the water inlet channel are of an open structure, the open side of the water inlet channel forms a water outlet end, and the upper end of the water inlet channel is communicated with the water outlet at the lower end of the water collecting barrel.
Therefore, the water inlet channel is arranged at the water outlet hole at the lower end of the water collecting barrel, the water outlet end is formed at the open side of the water inlet channel and is used for being connected with the water inlet end of the anaerobic treatment unit, and the anaerobic treatment device has the advantage of enabling sewage to enter the anaerobic treatment unit more uniformly.
The invention also discloses a domestic sewage treatment method suitable for villages, which is characterized by comprising the following steps of a, firstly, realizing solid-liquid separation of domestic sewage, separately collecting and treating separated solid parts, and carrying out subsequent purification treatment on separated liquid sewage parts; and b, sequentially carrying out intermittent anaerobic decomposition, aeration oxygenation, carrying out aerobic and anaerobic compound decomposition by combining plant root system absorption with a vertical undercurrent mode and a horizontal undercurrent mode, and finally, disinfecting by using the filler with copper oxide loaded on zeolite and removing pathogenic bacteria in the sewage and then flowing out.
Therefore, the method for treating the domestic sewage has the advantages of better sewage treatment quality and higher treatment efficiency.
As optimization, the method is realized by adopting the integrated processing system with the structure.
Like this, adopt the integrated processing system of above-mentioned structure to realize, have and to improve sewage treatment quality, improve sewage treatment ability, can be better with village domestic sewage in mud and the advantage that the excrement and sewage carries out the separation.
In conclusion, the beneficial effects of the invention are as follows: the method realizes the manure and sewage shunting, manure returning, reclaimed water recycling and the synergistic removal of pollutants, and obtains good treatment effect under the condition of low cost; and the fresh water resources can be prevented from being damaged, and the effect of protecting the environment is achieved. The excrement and sewage separation unit (and the solid-liquid separation unit) is used for shunting the excrement and sewage to realize resource utilization, so that the excrement enters the excrement collecting tank, and the sewage enters the anaerobic treatment unit; under the action of anaerobic bacteria, the anaerobic treatment unit degrades and converts complex organic matters into simple organic matters and releases energy; the oxygen environment in the wetland is poor, and when sewage with higher concentration is treated, the constructed wetland still cannot sufficiently remove organic matters and ammonia nitrogen by oxidation, so that the invention carries out aeration reoxygenation on the effluent of the anaerobic unit by a jet aerator and reoxygenation on the effluent of the vertical subsurface flow type constructed wetland by dropping the effluent to a reoxygenation tank so as to solve the problem of insufficient oxygen supply of the bed body of the constructed wetland; the biological membrane on the artificial wetland filter material degrades pollutants in the sewage, and the upper soil layer has a large amount of physical, chemical and biological effects of plant roots, microorganisms and soil minerals on absorption, degradation, replacement and the like of the pollutants in the sewage, so that the aim of purifying the sewage is fulfilled; the top filler of the horizontal undercurrent type constructed wetland is antibacterial filler zeolite loaded with copper oxide, SS is removed by filtering the water flow through the antibacterial filler, and the zeolite can further remove phosphorus in the sewage and efficiently kill pathogenic bacteria for disinfection; activated carbon is filled in the post-treatment unit, and impurities in water are adsorbed and removed by the activated carbon when water flows through the post-treatment unit, so that the effluent is clean and limpid; in a word, the invention has low sewage treatment and operation cost and good treatment effect, and the effluent quality can reach the national urban sewage discharge standard. The invention has wide application prospect in vast rural areas in China.
Drawings
Fig. 1 is a schematic sectional front view of a domestic sewage integrated treatment system applied to a village according to an embodiment of the present invention (arrows in the drawing indicate the flow direction of liquid).
Fig. 2 is a schematic sectional view in the horizontal direction of fig. 1.
FIG. 3 is a schematic sectional front view of the anaerobic treatment unit and the first tank portion of FIG. 1.
Fig. 4 is a schematic front section view of the vertical undercurrent type artificial wetland, the reoxygenation tank and the horizontal undercurrent type artificial wetland.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the specific implementation: as shown in fig. 1 to 4, the domestic sewage integrated treatment system suitable for villages comprises a feeding solid-liquid separation unit 51, wherein a feeding hole is formed in the feeding solid-liquid separation unit and is used for being connected with a sewage inlet pipeline 52; the device is characterized in that an anaerobic treatment unit 53 is arranged at a corresponding position at the lower part of one side of the feeding solid-liquid separation unit, the water inlet end of the anaerobic treatment unit is connected with the water outlet end of the feeding solid-liquid separation unit, and a filler is arranged in the anaerobic treatment unit; a vertical undercurrent type artificial wetland 54 and a horizontal undercurrent type artificial wetland 55 are arranged over the anaerobic treatment unit, the vertical undercurrent type artificial wetland 54 and the horizontal undercurrent type artificial wetland 55 are respectively filled with fillers and planted with plants, the water outlet end of the anaerobic treatment unit is connected with the water inlet end of the vertical undercurrent type artificial wetland through a pipeline and a suction device 56 arranged on the pipeline, the water outlet end of the vertical undercurrent type artificial wetland is connected with the water inlet end of the horizontal undercurrent type artificial wetland, and the water outlet end of the horizontal undercurrent type artificial wetland is used for discharging water.
Thus, when the integrated domestic sewage treatment system works, the domestic sewage of the village is collected and then flows into the feeding solid-liquid separation unit, the anaerobic treatment unit, the vertical subsurface flow type artificial wetland and the horizontal subsurface flow type artificial wetland from the sewage inlet pipe in sequence; the feeding solid-liquid separation unit can separate solid components and liquid components in the domestic sewage, so that the separated sewage continuously enters the anaerobic treatment unit, and when the anaerobic treatment unit treats the sewage, complex organic matters in the sewage are degraded and converted into simple organic matters, and organic pollutants, pathogenic bacteria, partial nitrogen and partial phosphorus in the domestic sewage are removed; then flows into the vertical undercurrent type artificial wetland and the horizontal undercurrent type artificial wetland for treatment. When the artificial wetland is treated, the filler arranged in the artificial wetland can be used for the implantation of biological bacteria, and can perform the functions of adsorption, detention, filtration, oxidation reduction, precipitation, microbial decomposition, transformation, plant shielding, residue accumulation, transpiration of water and nutrient absorption on pollutants to achieve the purification effect; in addition, the oxygen delivery function of partial wetland plant roots and the different flow states and oxygen containing conditions of the sewage at different positions of the artificial wetland change, so that the water flow can undergo sufficient aerobic and anaerobic alternate treatment processes when flowing in the artificial wetland. The coexistence of the aerobic and anaerobic conditions provides different suitable niches for the aerobic, facultative anaerobic and anaerobic microorganisms in the root zone, and further degradation and conversion of pollutants are promoted. Especially, the artificial wetland system plays a unique role in sewage treatment due to the nitrification and denitrification in the sewage denitrification process, the packing layer and the root system of the plant respectively have adsorption and absorption effects on the total phosphorus in the water, and the sewage treatment quality can be better improved. Finally, the water treated by the artificial wetland becomes clear and is discharged after realizing harmlessness. Therefore, the treatment system has the characteristics of realizing the shunting of excrement and sewage, returning of excrement to the field, recycling of reclaimed water, synergistic removal of pollutants and the like, and can obtain a good treatment effect under the condition of low cost; and the fresh water resources can be prevented from being damaged, and the effect of protecting the environment is achieved. The layout mode of the processing system enables the structure to be more compact; the whole treatment process can improve the sewage treatment quality and the sewage treatment capacity.
In this embodiment, the anaerobic treatment unit 53 includes a first anaerobic treatment unit 57, a second anaerobic treatment unit 58 and a third anaerobic treatment unit 59 which are spaced from each other and arranged side by side in the horizontal direction; the upper end of the first anaerobic treatment unit is a water inlet end and is connected with the water outlet end of the feeding solid-liquid separation unit, the lower end of the first anaerobic treatment unit is a water outlet end and is connected with the water inlet end at the lower end of the second anaerobic treatment unit, the upper end of the second anaerobic treatment unit is a water outlet end and is connected with the water inlet end at the upper end of the third anaerobic treatment unit, and the lower end of the third anaerobic treatment unit is a water outlet end and is connected with the water inlet end of the suction device.
Therefore, the anaerobic treatment unit is set into an anaerobic treatment first unit, an anaerobic treatment second unit and an anaerobic treatment third unit, the water treatment residence time is prolonged by skillfully utilizing the spatial layout, and meanwhile, a plurality of anaerobic treatment units which are separated by most can well shield oxygen at two ends from entering, so that a very stable and lasting anaerobic area is formed in the center of the anaerobic treatment units, and the reliability and the stability of the anaerobic treatment are ensured. Can pertinently carry out anaerobic fermentation denitrification treatment on organic matters in the domestic sewage, provide sufficient conditions for subsequent aerobic nitrification treatment and better ensure the stability of sewage treatment quality.
When the method is specifically implemented, sewage respectively passes through an anaerobic treatment first unit, an anaerobic treatment second unit and an anaerobic treatment third unit in the anaerobic treatment unit in sequence, fillers in the anaerobic treatment first unit, the anaerobic treatment second unit and the anaerobic treatment third unit adopt optimized hollow spherical fillers, the porosity of the hollow spherical fillers is about 0.2, the hollow spherical fillers are favorable for water retention and communication of water, nutrients and microorganisms among the fillers, complex organic matters are degraded and converted into simple organic matters through the action of anaerobic bacteria, and organic pollutants, pathogenic bacteria and partial nitrogen and phosphorus in domestic sewage are removed by utilizing specially domesticated special anaerobic or facultative microorganisms attached to the inner and outer surfaces of the hollow spherical fillers or suspended. The anaerobic treatment unit size is preferably selected to be 3.9 m.times.9 m.times.1.3 m, and the hydraulic retention time is 22 h. The lowest part of the bottoms of the first anaerobic treatment unit and the second anaerobic treatment unit is connected with a first sludge discharge pipe and a second sludge discharge pipe, the outer ends of the first sludge discharge pipe and the second sludge discharge pipe are respectively connected with a first sludge storage tank and a second sludge storage tank, and the first sludge storage tank and the second sludge storage tank are respectively 1m in cube volume3. So that the anaerobic treatment device can be opened periodically and used for draining sludge accumulated at the bottom of the anaerobic treatment unit to avoid blockage.
In this embodiment, the suction device 56 is a submersible sewage pump.
Therefore, the submersible sewage pump is used as the suction device, and the submersible sewage pump has the advantages of being not easy to block, simple in structure and convenient to use.
In the present embodiment, a first water tank 60 is disposed at one side of the anaerobic treatment unit, and a water inlet end of the first water tank is connected with a water outlet end of the anaerobic treatment unit; the submersible sewage pump is arranged at the bottom of the first water tank, a liquid level detection probe 61 is arranged on the side wall of the first water tank, and the liquid level detection probe is connected with an electric control end of the submersible sewage pump and is used for controlling the submersible sewage pump to start and stop according to whether the detected liquid level reaches or not; a second water tank 62 is arranged above the first water tank at intervals, and a jet aerator 63 is arranged between the first water tank and the second water tank; the jet aerator is provided with a liquid inlet pipeline connected with the water outlet end of the submersible sewage pump, an air inlet pipeline communicated with the outside air and a jet outlet pipeline communicated with the second water tank; the water outlet end of the second water tank is upwards connected with the vertical subsurface flow type artificial wetland.
Therefore, after the domestic sewage flows into the first water tank after being treated, when the liquid level in the first water tank reaches a preset value, the liquid level detection probe is triggered and controls the submersible sewage pump to work and pump the sewage to the aerator, the sewage is fully mixed with the air in the jet aerator to achieve the purpose of reoxygenation, then the sewage enters the second water tank from the water outlet end of the aerator through jet flow, and the air and the liquid are fully mixed in the second water tank to achieve full reoxygenation. After reoxygenation treatment, enough oxygen components can be provided for subsequent sewage treatment, so that an aerobic treatment area is formed subsequently, and the sewage treatment quality is improved. When sewage after reoxygenation treatment is treated in a subsequent vertical subsurface flow type artificial wetland, an aerobic treatment area beneficial to aerobic bacteria propagation is formed in a space area where filter fillers and plant root systems are mixed in the vertical subsurface flow type artificial wetland, so that the sewage simultaneously has the comprehensive treatment effects of filler adsorption, plant root system absorption and aerobic nitrification treatment, and pollutants in the sewage can be better adsorbed, retained, filtered, oxidized and reduced, precipitated, decomposed by microorganisms, transformed, shielded by plants, accumulated by residues, transpired water and absorbed by nutrients, so that a better purification effect is achieved.
In specific implementation, a first water tank is connected to the right side of the anaerobic treatment unit, a vertical third partition plate with the lower end spaced from the lower end face of the anaerobic treatment unit is arranged between the first water tank and the anaerobic treatment unit, a first grid is arranged between the third partition plate and the bottom of the anaerobic treatment unit, a liquid level controller (the liquid level detector is the liquid level detection probe) and a submersible sewage pump are arranged in the first water tank, the submersible sewage pump is connected with a jet aerator through a water pipe, the jet aerator is connected with a second water tank through a water pipe, the first water tank is used for receiving water overflowing from the anaerobic treatment unit, when the water level reaches 0.9m from the bottom of the first water tank, the liquid level controller in the first water tank starts the submersible sewage pump to pump the jet aerator, the water and air in the jet aerator are fully mixed to achieve the purpose of reoxygenation, and the water is pumped to the second water tank through the water pipe, when the water level is reduced to 0.3m away from the bottom of the first water tank, the liquid level controller in the first water tank turns off the submersible sewage pump to stop pumping water. The first water tank has a size of 1.2m × 9m × 1 m.
In this embodiment, the upper end surface of the second water tank 62 is provided with a plurality of evenly distributed water outlets which are communicated with the bottom of the vertical undercurrent type artificial wetland 54 for water inflow.
Therefore, the second water tank has multiple functions of isolating the anaerobic area below to ensure the anaerobic environment effect, fully mixing air and liquid to ensure the subsequent aerobic treatment effect and uniformly distributing water to the vertical undercurrent type artificial wetland above to reduce the impact of water flow on plant roots and the like. When sewage flows into the vertical undercurrent type artificial wetland from the second water tank during working, the plurality of water outlets which are uniformly distributed are arranged on the upper end surface of the second water tank, so that the sewage can more uniformly enter the vertical undercurrent type artificial wetland, and the treatment effect of the vertical undercurrent type artificial wetland is improved.
In the present embodiment, the vertical undercurrent type artificial wetland 54 comprises a first vertical undercurrent type artificial wetland unit 64, a second vertical undercurrent type artificial wetland unit 65 and a third vertical undercurrent type artificial wetland unit 66 which are independent from each other and are arranged side by side in the horizontal direction, wherein the lower end of the first vertical undercurrent type artificial wetland unit is provided with a bottom overflow hole and is connected with the water outlet end of the second water tank; the upper end of the first vertical undercurrent type artificial wetland unit is a water outlet end and is connected with the water inlet end at the upper end of the second vertical undercurrent type artificial wetland unit, and the lower end of the second vertical undercurrent type artificial wetland unit is a water outlet end and is connected with the water inlet end at the lower end of the third vertical undercurrent type artificial wetland unit; and the three units of the vertical undercurrent type artificial wetland are connected with the water inlet end of the horizontal undercurrent type artificial wetland.
Therefore, the vertical undercurrent type artificial wetland is set into a vertical undercurrent type artificial wetland first unit, a vertical undercurrent type artificial wetland second unit and a vertical undercurrent type artificial wetland third unit, so that pollutants in sewage can be treated in a targeted manner, and the sewage treatment quality is improved. Specifically, the sewage enters a second water tank for aeration reoxygenation after being subjected to denitrification treatment by an anaerobic treatment unit. The sewage and the air are mixed and are rich in oxygen, then enter the vertical undercurrent type artificial wetland, and then sequentially go back and forth up and down to pass through the three units of the vertical undercurrent type artificial wetland, the vertical undercurrent type artificial wetland is in a structural state that the filler is mixed with the plant root system, and the vertical undercurrent type artificial wetland is favorable for the implantation and propagation of water treatment microorganisms in the filler and the plant root system. Therefore, the sewage flows through a longer path in the vertical undercurrent type artificial wetland, the area stage when the sewage just enters is an aerobic treatment area with higher oxygen content, the biological filtration is carried out by microorganism aerobic bacteria with higher oxygen content, and the treatment effect is improved by combining the filler filtration and the plant root system absorption. Then, the sewage continuously flows in the vertical undercurrent type artificial wetland, the oxygen component in the sewage is gradually consumed and reduced, so that the water treatment environment gradually transits from aerobic to anoxic along the sewage flow path, and the implanted bacteria in the filler are gradually changed into micro aerobic bacteria or facultative aerobic bacteria (a vertical undercurrent type artificial wetland second unit) with lower oxygen demand from aerobic bacteria (a vertical undercurrent type artificial wetland first unit) to anaerobic bacteria (a vertical undercurrent type artificial wetland third unit). The structure of the three vertical subsurface flow type constructed wetland units can greatly enrich water treatment environments with different oxygen demands; meanwhile, the anaerobic treatment unit in the previous treatment process is combined, so that the sewage macroscopically forms anaerobic treatment, aerobic treatment and anaerobic treatment in sequence, a macroscopic treatment process of denitrification, nitrification and denitrification is formed, and the requirement of organic matter degradation is met. And the absorption and transformation of plant roots are combined, so that the water treatment effect is greatly improved.
When the vertical undercurrent type artificial wetland is implemented, a vertical undercurrent type artificial wetland is horizontally provided with a vertical fourth clapboard and a vertical fifth clapboard at intervals, the vertical undercurrent type artificial wetland is divided into a vertical undercurrent type artificial wetland first unit, a vertical undercurrent type artificial wetland second unit and a vertical undercurrent type artificial wetland third unit which are mutually independent, sewage uniformly enters from an overflow hole at the bottom of the vertical undercurrent type artificial wetland first unit through a second water tank, the size of the second water tank is 1.2m multiplied by 9m multiplied by 0.3m, water flows from the vertical undercurrent type artificial wetland first unit to the vertical undercurrent type artificial wetland second unit through a water permeable hole on the fourth clapboard by filling materials from bottom to top, the water flows from the vertical undercurrent type artificial wetland second unit to the vertical undercurrent type artificial wetland third unit through a water permeable hole on the fifth clapboard by filling materials, and the filling materials in the vertical undercurrent type artificial wetland first unit, the vertical undercurrent type artificial wetland second unit and the vertical undercurrent type artificial wetland third unit are of the filling materials with specifications, The thicknesses are the same, the bottom is cobblestones with the particle size of 0.03-0.05 m, and the thickness is 0.2 m; the upper part is the melon seed flaky stone with the particle size of 0.003-0.01 m and the thickness of 0.1 m; the middle part is pebbles with the grain diameter of 0.01-0.03 m, the thickness of 0.7m and the porosity of the filler substrate of 0.25-0.35. In order to prevent the filler from leaking downwards, geotextile is respectively paved on each layer, and the windmill grass is planted in the three units. The size of the vertical undercurrent type artificial wetland is 3.6m multiplied by 9m multiplied by 1.2m, the vertical undercurrent type artificial wetland is evenly divided into three units, the hydraulic retention time of water flow in the vertical undercurrent type artificial wetland is about 24h, and the vertical undercurrent type artificial wetland is utilized to adsorb, retain, filter, oxidize and reduce, precipitate, decompose microorganisms, convert, shield plants, accumulate residues, and absorb transpiration water and nutrients to achieve the purification effect. The vertical undercurrent type artificial wetland system can form a water body environment with aerobic front end, facultative anaerobic middle part and anaerobic rear part. The coexistence of the aerobic condition and the anaerobic condition provides different suitable niches for aerobic, facultative anaerobic and anaerobic microorganisms in a root zone, certainly promotes the degradation and transformation of pollutants, particularly the nitrification and denitrification in the sewage denitrification process, ensures that the vertical flow constructed wetland system plays a unique role in sewage treatment, and the filler layer and the root system of plants have the adsorption and absorption effect on total phosphorus in water.
In the embodiment, the system further comprises a reoxygenation tank 67 arranged between the vertical subsurface flow type artificial wetland 54 and the horizontal subsurface flow type artificial wetland 55, wherein the water inlet end of the reoxygenation tank is positioned below the water outlet end of the vertical subsurface flow type artificial wetland, a distance for the water outlet end of the vertical subsurface flow type artificial wetland to drop is formed between the water outlet end of the reoxygenation tank and the water outlet end of the horizontal subsurface flow type artificial wetland, and the water outlet end of the reoxygenation tank is connected with the water inlet end of the horizontal subsurface flow type artificial wetland.
Therefore, the effluent at the water outlet end of the vertical subsurface flow type artificial wetland can be fully mixed with air when falling in a water curtain shape and then enters the reoxygenation tank, and can be in a thin layer water flow in the reoxygenation tank, so that the atmospheric reoxygenation is rapid. And the water flow is reoxygenated again by the reoxygenation tank, so that the treatment effect can be better improved after the reoxygenation tank enters the horizontal undercurrent type artificial wetland.
In the embodiment, the water outlet end of the reoxygenation tank and the water inlet end of the horizontal subsurface flow type artificial wetland are positioned at the middle position in the height direction of one side of the area where the horizontal subsurface flow type artificial wetland is positioned, and the water outlet end of the horizontal subsurface flow type artificial wetland is positioned at the upper end position in the height direction of the other side of the area where the horizontal subsurface flow type artificial wetland is positioned.
Therefore, the water flow supplemented with oxygen again by the reoxygenation tank enters from the middle position of the horizontal undercurrent type artificial wetland, so that the lower part of the horizontal undercurrent type artificial wetland is an area with poor water body fluidity and is beneficial to anaerobic and immotile bacteria implantation, and the middle upper part of the horizontal undercurrent type artificial wetland is an aerobic area and the whole fluidity of the horizontal undercurrent type artificial wetland is slow. Therefore, aerobic and anaerobic alternate treatment areas can be formed in the horizontal undercurrent type artificial wetland again, and the implantation environment provided for water treatment bacteria in each area is different from that of the vertical undercurrent type artificial wetland on the whole due to the slow water body fluidity, so that the appropriate niches provided for more types of aerobic, facultative anaerobic and anaerobic microorganisms are formed in the plant root system and the filler. Therefore, the arrangement of the horizontal undercurrent type artificial wetland can further improve the overall water treatment effect of the system and improve the sewage treatment quality. Meanwhile, in the horizontal undercurrent type artificial wetland, secondary sedimentation before water discharge can be formed after the water flow speed is slowed, and the clarity of the discharged water is ensured.
Specifically, in the embodiment, the vertical height of the reoxygenation groove from the water outlet at the upper end of the vertical subsurface flow type artificial wetland (the water outlet at the upper end of the three units of the vertical subsurface flow type artificial wetland) is 0.3m, the water flow falls in a water curtain shape and is fully mixed with air, a thin layer water flow of 4-5mm is formed in the reoxygenation groove, the atmospheric reoxygenation is fast, and the water flow is uniformly distributed to the horizontal subsurface flow type artificial wetland through water inlet holes uniformly distributed at the water inlet end of the reoxygenation groove close to the middle position of one side of the horizontal subsurface flow type artificial wetland. The horizontal undercurrent type artificial wetland packing layer is respectively large gravels with the grain diameter of 0.06-0.09m and the thickness of 0.25m from bottom to top; small gravels with the particle size of 0.02-0.04m and the thickness of 0.2 m; the particle size of the crushed stone chips is 0.01-0.02 m, and the thickness is 0.15 m; the zeolite with the grain diameter of 0.01-0.02 m is loaded with copper oxide, and the thickness is 0.1 m; the porosity of the filler substrate is 0.25-0.35, and in order to prevent the filler from leaking downwards, geotextile is respectively paved on each layer, and the windmill grass can be planted in the wetland. The size of the horizontal undercurrent type artificial wetland is 1.2m multiplied by 9m multiplied by 0.8m, the hydraulic retention time of water flow in the horizontal undercurrent type artificial wetland is about 10.5h, the horizontal undercurrent type artificial wetland is utilized to further form an environment with coexistence of aerobic and anaerobic conditions, different suitable niches are provided for aerobic, facultative anaerobic and anaerobic microorganisms in a root zone, and the filler layer and the root system of a plant are combined to respectively have adsorption and absorption effects on total phosphorus in water, so that the water treatment effect is further improved.
In the embodiment, a layer of zeolite-loaded copper oxide antibacterial filler zeolite is paved on the top layer of the filler in the horizontal subsurface flow type constructed wetland. When the water flow passes through the filter, the SS is removed by the antibacterial filler, and the zeolite can further remove phosphorus in the sewage and efficiently kill pathogenic bacteria for disinfection.
In the specific embodiment, the device further comprises a post-treatment unit 79 connected with the water flow type artificial wet water outlet end in a horizontal undercurrent mode, wherein the water outlet end of the post-treatment unit is connected with the water discharge pipe to form a water outlet end; the post-treatment unit is filled with activated carbon.
Therefore, the activated carbon is arranged in the post-treatment unit, impurities in water are adsorbed and removed by the activated carbon when water flows through the post-treatment unit, so that the effluent is clean and limpid and is discharged through a drain pipe connected with the water outlet end of the post-treatment unit.
In specific implementation, the post-treatment unit adopts the following preferable parameters, the size of the post-treatment unit is 1.2m multiplied by 0.7m, and the porosity of the activated carbon in the post-treatment unit is 0.25-0.35.
In this embodiment, the feeding solid-liquid separation unit 51 comprises a solid-liquid separation pipe 68 which is obliquely arranged, a feces collection tank 69 is arranged below the solid-liquid separation pipe, the upper part of the upper end of the solid-liquid separation pipe is obliquely upward opened and is just opposite to and connected below the discharge end of the sewage inlet pipe, the lower end of the solid-liquid separation pipe is provided with an end separation grid and forms a water outlet end, and a water collection barrel 70 is connected below the lower end of the corresponding solid-liquid separation pipe; the upper end of the water collecting barrel is hung at the lower end 71 of a first rope, and the other end of the first rope is connected with the upper end of the solid-liquid separation pipe downwards after respectively bypassing a first fixed pulley 72 positioned above the water collecting barrel and a second fixed pulley 73 positioned at the upper end of the solid-liquid separation pipe; the lower end of the water collecting barrel is provided with a water outlet hole, an automatic water outlet control device 74 capable of controlling water outlet at intervals is arranged at the water outlet hole, and the lower end of the solid-liquid separation pipe is connected with the lower end of a vertical second rope 75 and is rotatably positioned in the feeding solid-liquid separation unit; after a certain amount of solid components are accumulated in the solid-liquid separation pipe, the upper end of the solid-liquid separation pipe can rotate downwards under the action of self weight and the water collection barrel after water outlet is pulled upwards through the first rope, the upper end of the solid-liquid separation pipe rotates downwards to a downward inclined state and slides the solid components accumulated in the solid-liquid separation pipe out of the end opening to the excrement collection tank below, and after the solid components in the solid-liquid separation pipe slide out, the water collection barrel can pull the upper end of the solid-liquid separation pipe back to an upward inclined state through the first rope; a vertical third rope 76 is also arranged in the feeding solid-liquid separation unit, and the lower end of the third rope is connected with the water collecting barrel and used for limiting the downward limiting position of the water collecting barrel.
Therefore, when the feeding solid-liquid separation unit works, domestic sewage flows through the sewage inlet pipeline after being collected, flows out of the outlet end of the sewage inlet pipeline and flows into the sewage inlet pipeline from the opening at the upper end of the solid-liquid separation pipe. After the domestic sewage flows into the solid-liquid separation pipe, the solid-liquid separation pipe intercepts and accumulates solid components in the domestic sewage in the solid-liquid separation pipe, and liquid components in the domestic sewage flow out of a water outlet end formed at the lower end of the solid-liquid separation pipe and are collected in the water collection barrel. When a certain amount of solid components are accumulated in the solid-liquid separation pipe, the sewage collected in the water collecting barrel reaches a certain amount, and the automatic water outlet control device arranged at the water outlet controls the water outlet to discharge water. Sewage in the water collecting barrel is emptied or a certain amount is discharged, and simultaneously solid components in the solid-liquid separation pipe are accumulated to a certain amount to ensure that the two ends of the first rope are unbalanced, the upper end of the solid-liquid separation pipe can rotate downwards under the action of self weight and pull up the water collecting barrel after water is discharged through the first rope, and the upper end of the solid-liquid separation pipe rotates downwards to an inclined downward state and slides out the solid components accumulated in the solid-liquid separation pipe to the excrement collecting tank below from the end opening. After solid components in the solid-liquid separation pipe slide out, the water collecting barrel can pull the upper end of the solid-liquid separation pipe back to an upward inclined state through the first rope, so that the two ends of the first rope are restored to the original balance state. After the domestic sewage enters the solid-liquid separation pipe, the solid-liquid separation pipe continuously performs solid-liquid separation on the domestic sewage entering the solid-liquid separation pipe until the solid-liquid separation pipe slides the collected solid components out of the end opening to the excrement collecting tank below, so that the solid-liquid separation of the domestic sewage is continuously performed, sludge and excrement in the village domestic sewage can be better separated, and the sewage treatment quality is improved.
During specific implementation, the feeding solid-liquid separation unit can also adopt a direct inclined grid, so that the waste to be treated falls onto the grid and slowly slides downwards, liquid of the waste is filtered to the lower part of the grid along the grid in the sliding process, and the solid part slides out to the front along with the grid, so that solid-liquid separation is realized. The solid-liquid separation unit has simpler structure and low cost. However, in particular use, the residence time of the waste on the grid cannot be controlled, often resulting in a very short time during which the liquid slides down the grid along with the solid fraction without having to be filtered. Resulting in poor solid-liquid separation effect and difficult control. When the solid-liquid separation unit is used, the solid part can stay in the solid-liquid separation pipe all the time, and the liquid part is filtered out slowly, so that the solid-liquid separation unit has a very good solid-liquid separation effect.
In this embodiment, the lower portion of the solid-liquid separation pipe is provided with an internal separation grid along the axial direction, so that the upper portion of the separation grid forms a solid part accumulation space 77, and the lower portion of the separation grid forms a sewage convergence space 78.
Therefore, after domestic sewage waste (mainly excrement) and the like flow into the solid-liquid separation pipe, the waste firstly enters a solid part accumulation space formed at the upper part of a separation grid in the solid-liquid separation pipe, the separation grid can separate a solid part and a liquid part in the domestic sewage, and the liquid part after separation enters the lower part of the separation grid to form a sewage convergence space and flows out from a water outlet end of the solid-liquid separation pipe. Therefore, the solid-liquid separation can be carried out immediately after the waste falls into the solid-liquid separation pipe, so that the solid-liquid separation efficiency of the solid-liquid separation pipe can be improved, and the solid-liquid separation quality can be improved.
In this embodiment, the non-stick material is coated on the inner cavity of the solid-liquid separation tube and the surface of the separation grid. (preferably applied using a nanomaterial).
Therefore, when solid-liquid separation is carried out, the solid part and the liquid part can be better separated, and when the solid part is poured into the excrement collecting pool from the solid-liquid separation pipe, the solid part is not easy to adhere to the inner cavity of the solid-liquid separation pipe, so that the advantage of more conveniently realizing solid-liquid separation is achieved.
In this embodiment, a vertical guiding sliding fit structure can be added between the two sides of the water collecting barrel 70 and the inner cavity wall of the feeding solid-liquid separation unit.
Like this, increase vertical direction sliding fit structure between sump drum both sides and the feeding solid-liquid separation unit inner chamber wall for when solid-liquid separation pipe upper end downwardly rotated and upwards pulled up the sump drum after going out water through first rope and when the vertical downstream of sump drum draws the solid-liquid separation pipe upper end back to the tilt up state through first rope, the vertical operation of sump drum is more steady.
In this embodiment, the automatic water outlet control device 74 is a liner disposed corresponding to the water outlet hole and is used for controlling the water outlet of the water outlet hole at intervals.
Like this, set up automatic water control device into current water courage that falls, have simple structure, advantage easy to assemble use.
In this embodiment, a water inlet channel 80 is provided corresponding to the water outlet hole of the lower end of the water collecting barrel, the water inlet channel is integrally of a flat box structure, the upper end and one side of the water inlet channel are open, the open side of the water inlet channel forms a water outlet end, and the upper end of the water inlet channel is communicated with the water outlet of the lower end of the water collecting barrel.
Therefore, the water inlet channel is arranged at the water outlet hole at the lower end of the water collecting barrel, the water outlet end is formed at the open side of the water inlet channel and is used for being connected with the water inlet end of the anaerobic treatment unit, and the anaerobic treatment device has the advantage of enabling sewage to enter the anaerobic treatment unit more uniformly.
The invention also discloses a domestic sewage treatment method suitable for villages, which is characterized by comprising the following steps of a, firstly, realizing solid-liquid separation of domestic sewage, separately collecting and treating separated solid parts, and carrying out subsequent purification treatment on separated liquid sewage parts; and b, sequentially carrying out intermittent anaerobic decomposition, aeration oxygenation and composite decomposition of aerobic and anaerobic modes by utilizing plant root system absorption combined with a vertical undercurrent mode and a horizontal undercurrent mode on the liquid sewage, and finally, carrying out copper oxide sterilization by using filler zeolite and removing pathogenic bacteria in the sewage and then making the sterilized sewage flow into a post-treatment unit.
Therefore, the method for treating the domestic sewage has the advantages of better sewage treatment quality and higher treatment efficiency.
In the present embodiment, the method is implemented by using the integrated processing system with the above structure.
Like this, adopt the integrated processing system of above-mentioned structure to realize, have and to improve sewage treatment quality, improve sewage treatment ability, can be better with village domestic sewage in mud and the advantage that the excrement and sewage carries out the separation.
In conclusion, the beneficial effects of the invention are as follows: the method realizes the manure and sewage shunting, manure returning, reclaimed water recycling and the synergistic removal of pollutants, and obtains good treatment effect under the condition of low cost; and the fresh water resources can be prevented from being damaged, and the effect of protecting the environment is achieved. The excrement and sewage separation unit (and the solid-liquid separation unit) is used for shunting the excrement and sewage to realize resource utilization, so that the excrement enters the excrement collecting tank, and the sewage enters the anaerobic treatment unit; under the action of anaerobic bacteria, the anaerobic treatment unit degrades and converts complex organic matters into simple organic matters and releases energy; the oxygen environment in the wetland is poor, and when sewage with higher concentration is treated, the constructed wetland still cannot sufficiently remove organic matters and ammonia nitrogen by oxidation, so that the invention carries out aeration reoxygenation on the effluent of the anaerobic unit by a jet aerator and reoxygenation on the effluent of the vertical subsurface flow type constructed wetland by dropping the effluent to a reoxygenation tank so as to solve the problem of insufficient oxygen supply of the bed body of the constructed wetland; the biological membrane on the artificial wetland filter material degrades pollutants in the sewage, and the upper soil layer has a large amount of physical, chemical and biological effects of plant roots, microorganisms and soil minerals on absorption, degradation, replacement and the like of the pollutants in the sewage, so that the aim of purifying the sewage is fulfilled; the top filler of the horizontal undercurrent type constructed wetland is antibacterial filler zeolite loaded with copper oxide, SS is removed by filtering the water flow through the antibacterial filler, and the zeolite can further remove phosphorus in the sewage and efficiently kill pathogenic bacteria for disinfection; activated carbon is filled in the post-treatment unit, and impurities in water are adsorbed and removed by the activated carbon when water flows through the post-treatment unit, so that the effluent is clean and limpid; in a word, the invention has low sewage treatment and operation cost and good treatment effect, and the effluent quality can reach the national urban sewage discharge standard. The invention has wide application prospect in vast rural areas in China.
In practical application, the processing system can determine the specification of each unit through the following calculation formula:
calculating the area of the anaerobic treatment unit:
Figure BDA0002259643880000221
wherein:
a is the area of the anaerobic treatment unit, Q is the design flow,
C0is the BOD of the inlet water in mg/L,
C1is the BOD of the effluent water in mg/L,
qosfor the surface organic load kg/m2D, can be selected according to the specification.
Calculating the hydraulic retention time:
Figure BDA0002259643880000222
wherein: t is the hydraulic retention time, Q is the design flow,
v is the volume of the filler in the anaerobic treatment unit,
ε is the porosity.
Calculating the surface hydraulic load:
Figure BDA0002259643880000223
wherein: q. q.shsFor surface hydraulic loading, Q for design flow,
a is the area of the anaerobic treatment unit.
Calculating the area of the vertical undercurrent type constructed wetland:
Figure BDA0002259643880000224
wherein: a is the area of the vertical undercurrent type artificial wetland, Q is the design flow,
C0is the BOD of the inlet water in mg/L,
C1is the BOD of the effluent water in mg/L,
qosfor the surface organic load kg/m2D, can be selected according to the specification.
Calculating the hydraulic retention time:
Figure BDA0002259643880000231
wherein: t is the hydraulic retention time,
q is the designed flow rate of the liquid,
v is the volume of the substrate in the vertical undercurrent type artificial wetland,
ε is the porosity.
Calculating the surface hydraulic load:
Figure BDA0002259643880000232
wherein: q. q.shsFor surface hydraulic loading, Q for design flow,
a is the area of the vertical undercurrent type artificial wetland.
Calculating the area of the horizontal undercurrent type constructed wetland:
Figure BDA0002259643880000233
wherein: a is the area of the horizontal undercurrent type artificial wetland,
q is the designed flow rate of the liquid,
C0is the BOD of the inlet water in mg/L,
C1is the BOD of the effluent water in mg/L,
qosfor the surface organic load kg/m2D, can be selected according to the specification.
Calculating the hydraulic retention time:
Figure BDA0002259643880000234
wherein: t is the hydraulic retention time, Q is the design flow,
v is the volume of the substrate in the horizontal undercurrent type artificial wetland,
ε is the porosity.
Calculating the surface hydraulic load:
Figure BDA0002259643880000241
wherein:qhsIn order to be a surface hydraulic load,
q is the designed flow rate of the liquid,
a is the area of the vertical undercurrent type artificial wetland.
The post-treatment unit is internally provided with activated carbon, impurities in water are adsorbed and removed by the activated carbon when water flows through the post-treatment unit, so that the effluent is clean and limpid, and finally the effluent is discharged through a drain pipe.
Post-processing unit size calculation:
Figure BDA0002259643880000242
wherein: v is the volume of the matrix filler in the post-treatment unit,
t is the hydraulic retention time,
q is the designed flow rate of the liquid,
ε is the porosity.

Claims (7)

1. The domestic sewage integrated treatment system suitable for villages comprises a feeding solid-liquid separation unit (51), wherein a feeding hole is formed in the feeding solid-liquid separation unit and is used for being connected with a sewage inlet pipeline (52); the device is characterized in that an anaerobic treatment unit (53) is arranged at a corresponding position at the lower part of one side of the feeding solid-liquid separation unit, the water inlet end of the anaerobic treatment unit is connected with the water outlet end of the feeding solid-liquid separation unit, and a filler is arranged in the anaerobic treatment unit; a vertical undercurrent type artificial wetland (54) and a horizontal undercurrent type artificial wetland (55) are arranged over the anaerobic treatment unit, the vertical undercurrent type artificial wetland (54) and the horizontal undercurrent type artificial wetland (55) are respectively filled with fillers and planted with plants, the water outlet end of the anaerobic treatment unit is connected with the water inlet end of the vertical undercurrent type artificial wetland through a pipeline and a suction device (56) arranged on the pipeline, the water outlet end of the vertical undercurrent type artificial wetland is connected with the water inlet end of the horizontal undercurrent type artificial wetland, and the horizontal undercurrent type artificial wetland is provided with a water outlet end for water outlet;
the suction device (56) is a submersible sewage pump;
a first water tank (60) is arranged on one side of the anaerobic treatment unit, a vertical third partition plate with the lower end spaced from the lower end face of the anaerobic treatment unit is arranged between the first water tank and the anaerobic treatment unit, and a first grid is arranged between the third partition plate and the bottom of the anaerobic treatment unit, so that the water inlet end of the first water tank is connected with the water outlet end of the anaerobic treatment unit; the submersible sewage pump is arranged at the bottom of the first water tank, a liquid level detection probe (61) is arranged on the side wall of the first water tank, and the liquid level detection probe is connected with an electric control end of the submersible sewage pump and is used for controlling the start and stop of the submersible sewage pump according to whether the detected liquid level reaches or not; a second water tank (62) is arranged above the first water tank at intervals, and a jet aerator (63) is arranged between the first water tank and the second water tank; the jet aerator is provided with a liquid inlet pipeline connected with the water outlet end of the submersible sewage pump, an air inlet pipeline communicated with the outside air and a jet outlet pipeline communicated with the second water tank; the water outlet end of the second water tank is upwards connected with the vertical subsurface flow type artificial wetland;
a plurality of water outlets which are uniformly distributed are formed in the upper end surface of the second water tank (62) and communicated with the bottom of the vertical undercurrent type artificial wetland (54) for water inflow;
the feeding solid-liquid separation unit (51) comprises a solid-liquid separation pipe (68) which is obliquely arranged, an excrement collecting pool (69) is arranged below the solid-liquid separation pipe, an opening is formed in the upper part of the upper end of the solid-liquid separation pipe in an oblique direction and is just opposite to and connected below the discharge end of the sewage inlet pipeline, an end part separation grid net is arranged at the lower end of the solid-liquid separation pipe to form a water outlet end, and a water collecting barrel (70) is connected below the lower end of the corresponding solid-liquid separation pipe; the upper end of the water collecting barrel is hung at the lower end (71) of a first rope, and the other end of the first rope is connected with the upper end of the solid-liquid separation pipe downwards after respectively bypassing a first fixed pulley (72) positioned above the water collecting barrel and a second fixed pulley (73) positioned at the upper end of the solid-liquid separation pipe; the lower end of the water collecting barrel is provided with a water outlet hole, an automatic water outlet control device (74) capable of controlling water outlet at intervals is arranged at the water outlet hole, and the lower end of the solid-liquid separation pipe is connected with the lower end of a vertical second rope (75) and is rotatably positioned in the feeding solid-liquid separation unit; after a certain amount of solid components are accumulated in the solid-liquid separation pipe, the upper end of the solid-liquid separation pipe can rotate downwards under the action of self weight and the water collection barrel after water outlet is pulled upwards through the first rope, the upper end of the solid-liquid separation pipe rotates downwards to a downward inclined state and slides the solid components accumulated in the solid-liquid separation pipe out of the end opening to the excrement collection tank below, and after the solid components in the solid-liquid separation pipe slide out, the water collection barrel can pull the upper end of the solid-liquid separation pipe back to an upward inclined state through the first rope; a vertical third rope (76) is also arranged in the feeding solid-liquid separation unit, and the lower end of the third rope is connected with the water collecting barrel and used for limiting the downward limiting position of the water collecting barrel.
2. The integrated domestic sewage treatment system suitable for villages of claim 1, wherein: the anaerobic treatment unit (53) comprises a first anaerobic treatment unit (57), a second anaerobic treatment unit (58) and a third anaerobic treatment unit (59) which are spaced from each other and arranged side by side in the horizontal direction; the upper end of the first anaerobic treatment unit is a water inlet end and is connected with the water outlet end of the feeding solid-liquid separation unit, the lower end of the first anaerobic treatment unit is a water outlet end and is connected with the water inlet end at the lower end of the second anaerobic treatment unit, the upper end of the second anaerobic treatment unit is a water outlet end and is connected with the water inlet end at the upper end of the third anaerobic treatment unit, and the lower end of the third anaerobic treatment unit is a water outlet end and is connected with the water inlet end of the suction device.
3. The integrated domestic sewage treatment system suitable for villages of claim 1, wherein: the vertical undercurrent type artificial wetland (54) comprises a vertical undercurrent type artificial wetland one unit (64), a vertical undercurrent type artificial wetland two unit (65) and a vertical undercurrent type artificial wetland three unit (66) which are mutually independent and are arranged side by side in the horizontal direction, and the lower end of the vertical undercurrent type artificial wetland one unit is provided with a bottom overflow hole and is connected with the water outlet end of the second water tank; the upper end of the first vertical undercurrent type artificial wetland unit is a water outlet end and is connected with the water inlet end at the upper end of the second vertical undercurrent type artificial wetland unit, and the lower end of the second vertical undercurrent type artificial wetland unit is a water outlet end and is connected with the water inlet end at the lower end of the third vertical undercurrent type artificial wetland unit; and the three units of the vertical undercurrent type artificial wetland are connected with the water inlet end of the horizontal undercurrent type artificial wetland.
4. The integrated domestic sewage treatment system suitable for villages of claim 1, wherein: the system also comprises a reoxygenation tank (67) arranged between the vertical undercurrent type artificial wetland (54) and the horizontal undercurrent type artificial wetland (55), wherein the water inlet end of the reoxygenation tank is positioned below the water outlet end of the vertical undercurrent type artificial wetland, a distance for the water outlet end of the vertical undercurrent type artificial wetland to drop is formed between the water inlet end of the reoxygenation tank and the water outlet end of the horizontal undercurrent type artificial wetland, and the water outlet end of the reoxygenation tank is connected with the water inlet end of the horizontal undercurrent type artificial wetland.
5. The integrated domestic sewage treatment system suitable for villages of claim 1, wherein: a layer of zeolite loaded copper oxide antibacterial filler is paved on the top layer of the filler in the horizontal undercurrent type constructed wetland.
6. The integrated domestic sewage treatment system suitable for villages of claim 1, wherein: an internal separation grid is axially arranged at the lower part of the solid-liquid separation pipe, so that a solid part accumulation space (77) is formed at the upper part of the separation grid, and a sewage convergence space (78) is formed at the lower part of the separation grid;
vertical guide sliding fit structures can be added between the two sides of the water collecting barrel (70) and the inner cavity wall of the feeding solid-liquid separation unit.
7. A domestic sewage treatment method suitable for villages is characterized in that the method is realized by adopting the integrated treatment system as claimed in any one of claims 1 to 6, and comprises the following steps of a, firstly, realizing solid-liquid separation of the domestic sewage, separately collecting and treating separated solid parts, and carrying out subsequent purification treatment on separated liquid sewage parts; and b, sequentially carrying out intermittent anaerobic decomposition, aeration oxygenation, carrying out aerobic and anaerobic compound decomposition by combining plant root system absorption with a vertical undercurrent mode and a horizontal undercurrent mode, and finally carrying out copper oxide sterilization by filler zeolite and removing pathogenic bacteria in the sewage and then discharging.
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