CN116119859A - Ecological filtering method for rain and sewage overflow port treatment - Google Patents
Ecological filtering method for rain and sewage overflow port treatment Download PDFInfo
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- CN116119859A CN116119859A CN202211575368.1A CN202211575368A CN116119859A CN 116119859 A CN116119859 A CN 116119859A CN 202211575368 A CN202211575368 A CN 202211575368A CN 116119859 A CN116119859 A CN 116119859A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses an ecological filtering method for rain and sewage overflow port treatment. It comprises the following steps: regulating water quality; the method comprises the steps of purifying water, intercepting larger colloid particles in sewage through a cultivation substrate, absorbing and converting nitrogen and phosphorus nutritive salts in the sewage through plant roots, adsorbing organic pollutants in the sewage through hollow fiber balls and columnar porous activated carbon, and converting organic matters through microorganisms inside and outside a microbial membrane; filtering water, prolonging biochemical treatment time through a second biological contact oxidation pond, deeply intercepting and adsorbing extremely fine suspended particles and colloid through a combined multi-medium filter material, enriching active microorganisms and improving active microorganism concentration; and (5) collecting clear water. The invention simulates the self-cleaning function of a natural ecological system, cuts off the rain and sewage at the overflow port on site and purifies the water quality step by step, reduces the pollution load of the entering river water from the source, and has the advantages of high pollution control efficiency, low influence degree, low energy consumption, automatic balance adjustment, simple and convenient operation, low construction cost and the like.
Description
Technical Field
The invention relates to the technical field of water environment pollution treatment, in particular to an ecological filtering method for rain and sewage overflow port treatment.
Background
The urban rain and sewage overflow ports have particularly prominent influence on the pollution of water bodies of surrounding rivers and lakes, and the direct drainage of rain and sewage overflow is often the main cause of black and odorous phenomena or eutrophication pollution of water bodies of rivers and lakes.
Although most sewage outlets are modified by sewage interception nano tubes in many places, the old urban planning is behind, and the drainage system is old, so that the rainwater and sewage mixed connection and staggered connection confluence drainage ports still exist; in addition, the residential buildings are densely distributed, and the sewage interception and diversion engineering is carried out without site conditions, so that the work propulsion of the sewage interception nano tube is quite difficult. In rainy season, the residual rain and sewage exceeding the flow of the sewage receiving pipe and the capacity of the intercepting well enters the surrounding surface water area in a mixed drainage and overflow mode, pollutants with higher concentration including Suspended Substances (SS), organic matters, nitrogen and phosphorus nutritive salts and the like are discharged into the water body, and the enrichment of the pollutants exceeds the self-cleaning capacity of the water body.
The pollution to the surrounding water body, especially the water area near the overflow port, can seriously cause the blackening and the stinking of the receiving water body, become the black and stinking water body and lose the ecological function of the water body.
With the continuous deep understanding of water environment pollution and the improvement of environmental protection consciousness, the rain and sewage treatment of overflow ports of rivers and lakes is particularly important. However, no effective countermeasure and treatment means are available at present for the pollution control of the overflow port of the water body entering the river and the lake. The Chinese patent of the invention is a river rain and sewage overflow port pretreatment system (application publication number CN 107986577A) for solving the problem of suspended matters in the water quality of primary rain water and rain and sewage mixed flow water, and primarily reducing SS and turbidity indexes of the rain and sewage overflow port overflow water body, wherein indexes of other important pollutants in the overflow water body such as nitrogen and phosphorus nutritive salt, COD, organic matters and the like can not be effectively removed, and the rain and sewage at the overflow port can still aggravate eutrophication pollution of the river and lake water body.
In addition, for the rain and sewage treatment of the combined overflow port, a local construction of a distributed sewage treatment station mode is adopted for purification treatment in some places, and water is discharged into a receiving water body after marked. The water quality index of the effluent treated by the method can reach GB18918-2002 pollutant emission Standard of urban wastewater treatment plants, and the pollution load of the incoming water body is effectively reduced. However, the establishment of a decentralized sewage treatment plant has the following disadvantages: firstly, the disturbance to the surrounding environment of the water body is large; secondly, land is more invaded; thirdly, the power energy consumption is higher; fourth, the investment and the operation cost are relatively large; fifth, the professional requirements for management personnel are also high.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an ecological filtering method for rain and sewage overflow port treatment, which can ecologically intercept rain and sewage at the overflow port and purify water quality step by step under the condition of low energy consumption, reduces the water pollution load entering rivers and lakes from the source, and has the treatment advantages of high pollution treatment efficiency, low influence degree, low energy consumption, automatic balance adjustment, simple and convenient operation, low construction cost, low operation cost, small occupied area and the like.
In order to achieve the above purpose, the invention provides an ecological filtering method for rain and sewage overflow port treatment, which is characterized by comprising the following steps:
firstly, water quality adjustment, namely performing primary separation on sewage flowing out of a rain and sewage overflow port, separating out sediment and suspended matter impurities with larger specific gravity by utilizing gravity sedimentation, and collecting the separated sediment and suspended matter impurities;
step two, water quality purification, namely firstly intercepting larger colloid particles in sewage through a plant cultivation matrix, then absorbing and converting nitrogen and phosphorus nutritive salts in the sewage through plant roots, then absorbing organic pollutants in the sewage through hollow fiber balls and columnar porous activated carbon, finally converting ammonia nitrogen in the sewage into nitronitrogen through biochemical treatment by utilizing aerobic layer microorganisms outside microbial membranes, and converting easily-decomposed small molecular organic matters in the sewage into CO 2 And H 2 O, converting inorganic phosphorus in sewage into adenosine triphosphate in cell body, and converting nitro nitrogen into N by utilizing anaerobic layer microbe in microbial film 2 Converting macromolecular organic matters which are difficult to decompose in the sewage into small molecular organic matters which are easy to degrade;
step three, water quality filtration, namely, continuously carrying out biochemical treatment on the sewage to prolong the biochemical treatment time, then carrying out multi-medium filtration on the sewage, on one hand, deeply intercepting and adsorbing extremely fine suspended particles and colloid, on the other hand, enriching active microorganisms to improve the concentration of the active microorganisms, and finally, gathering the filtered clear water;
and fourthly, collecting the clear water, collecting the collected clear water, and finally naturally flowing into a nearby river.
Further, in step one, water quality adjustment is carried out in the equalizing basin, the equalizing basin includes first sedimentation tank and the second sedimentation tank of tandem arrangement, the intercommunication has a plurality of interval arrangement's communicating pipe between first sedimentation tank and the second sedimentation tank, communicating pipe water inlet, delivery port all wrap up have be used for holding back slice or granular pollutant's stainless steel wire net, first sedimentation tank is provided with first drain with second sedimentation tank bottom, second sedimentation tank lateral wall upper portion intercommunication has interval arrangement's first outlet pipe.
In the second step, water quality purification is performed in a purification tank, wherein the purification tank comprises a plant cultivation layer, an adsorption layer and a first biological contact oxidation tank which are sequentially arranged from top to bottom, and a first porous partition plate is arranged between two adjacent layers; the top end of the plant cultivation layer is paved with a porous cover plate, a planting basket for planting green plants is arranged in the porous cover plate hole, a cultivation substrate for fixing the green plants and retaining colloid particles in sewage is arranged in the planting basket, a plant root layer for absorbing and converting nitrogen and phosphorus nutrient salts in the sewage is arranged at the lower end of the planting basket, and the first water outlet pipe penetrates through the plant root layer; the first biological contact oxidation pond comprises a plurality of first carbon fiber artificial aquatic weeds which are hung up and down, a first membranous biopolymer used for degrading organic pollutants in sewage is attached to the periphery of each first carbon fiber artificial aquatic weed, each first membranous biopolymer comprises an aerobic layer outside the membrane, a facultative layer in the membrane and an anaerobic layer in the membrane, a first hollow porous suspension ball is arranged at the tail end of each first carbon fiber artificial aquatic weed, activated carbon particles used for fixing microbial membranes are filled in the first hollow porous suspension ball, an aeration device is arranged at the bottom end of each first biological contact oxidation pond, a second sewage draining outlet is further arranged at the bottom end of each first biological contact oxidation pond, and water outlets are communicated with the bottom end of the side wall of each first biological contact oxidation pond.
In the second step, the green plants in the planting basket comprise canna, windmill bamboo, rohdea japonica, tortoise back bamboo, iris, calamus and allium mongolicum, the cultivation matrix comprises quartz sand and zeolite mixture with the particle size of 2-4 mm, the plant root system layer comprises hard porous ceramsite at the upper layer and volcanic rock at the lower layer, and the particle sizes of the hard porous ceramsite and the volcanic rock are 8-12 mm; the adsorption layer comprises an upper hollow fiber ball and a lower columnar porous active carbon, wherein the particle size of the hollow fiber ball is 3-5 mm, and the particle size of the columnar porous active carbon is 3-5 mm; the effluent Kong Yandi is arranged on the side wall of the biological contact oxidation tank at intervals.
In the third step, water quality filtration is performed in a filter tank, wherein the filter tank comprises a second biological contact oxidation tank, a medium filter layer and a water collecting channel cavity which are sequentially arranged from bottom to top, a second porous partition plate is arranged between two adjacent layers, and a dynamic aeration chamber is arranged at the top end of the water collecting channel cavity; a third sewage outlet is formed in the bottom end of the second biological contact oxidation tank; pebbles are filled in the catchment channel cavity, and a second water outlet pipe is communicated with the middle part of the side wall of the catchment channel cavity; the power aeration chamber is internally provided with an oxygenation pump, the oxygenation pump is connected with an aeration device, and the top end of the power aeration chamber is provided with a vent hole communicated with the outside atmosphere.
In the third step, the second biological contact oxidation pond comprises a plurality of second carbon fiber artificial aquatic weeds which are suspended up and down, wherein a second membranous biopolymer used for degrading organic pollutants in sewage is attached to the periphery of each second carbon fiber artificial aquatic weed, the second membranous biopolymer comprises an aerobic layer outside a membrane, a facultative layer in the membrane and an anaerobic layer inside the membrane, the tail end of each second membranous biopolymer is provided with a second hollow porous suspension ball, activated carbon particles used for fixing microbial membranes are filled in the second hollow porous suspension ball, and an aeration device is arranged at the bottom end of the second biological contact oxidation pond; the medium filter layer comprises a smokeless coal bed, a manganese sand layer, an activated carbon particle layer and a quartz sand layer which are sequentially filled from bottom to top, and a interception net for intercepting fine suspended particles or fine colloid is arranged between two adjacent layers.
Further, in the third step, the smokeless coal bed comprises anthracite with the particle size of 2-4 mm, the manganese sand layer comprises manganese sand with the particle size of 1.5-3 mm, the activated carbon particle layer comprises activated carbon with the particle size of 1.2-2 mm, the quartz sand layer comprises quartz sand with the particle size of 0.8-1.5 mm, and the interception net is stainless steel wires or non-woven fabrics with the mesh size of 0.8-1 mm; the second water outlet pipes are arranged at intervals along the side wall of the catchment channel cavity.
Still further, the first drain, the second drain and the third drain are all of inverted cone structure.
Further, in the fourth step, clean water is collected in the clean water tank, the clean water tank comprises a first grid and a second grid which are arranged in series, a plurality of siphons which are arranged at intervals are communicated between the first grid and the second grid, stainless steel wire nets for intercepting flaky or granular pollutants are arranged at the water inlet and the water outlet of the siphons, and a third water outlet pipe is communicated with the upper part of the second grid close to the outer side wall.
Further, the hydraulic retention time of the sewage in the water quality adjusting process is not less than 30min, the hydraulic retention time of the sewage in the water quality purifying process is not less than 60min, the hydraulic retention time of the sewage in the water quality filtering process is not less than 30min, and the hydraulic retention time of the clear water in the clear water collecting process is not less than 15min.
The invention has the advantages that:
1. low influence and low energy consumption
The invention fully adopts the design of high-low dislocation layers, performs in-situ treatment, and naturally flows from high to low under the action of the self gravity of the water body, so that the power lifting link is reduced, and the energy consumption is saved;
2. the automatic balance adjustment and operation of the system are simple and convenient
The micro-ecological balance system established by artificial culture automatically completes self-cleaning treatment of rain and sewage at an overflow port based on a biological membrane filtering technology, has a self-adjusting function, does not need to add specific chemicals in the running process of the system, does not need to be attended by special persons, reduces the possibility of abnormal running of the system caused by human error operation, has fewer fault points, and is simple and convenient to operate and maintain;
3. purifying pollution by means of physical, chemical and biological multiple synergistic effect, and has high pollution control efficiency
According to the water quality characteristics of good biodegradability of rain and sewage at an overflow port, the artificial wetland process is organically combined with a biological contact oxidation method, and the combined actions of sedimentation separation, plant absorption and conversion, interception and adsorption, metabolic degradation and the like are utilized to continuously purify pollutants in the sewage at the overflow port, so that hydrodynamic force is improved, the reoxygenation efficiency of a water body is improved, the water body biological population structure is optimized, active microorganisms are enriched, the bioconversion and metabolic degradation capacity is further enhanced, the self-cleaning and ecological restoration capacity of the water body are enhanced, the denitrification and dephosphorization effects are remarkable, the removal rate of pollution indexes such as total nitrogen, total phosphorus, chemical oxygen demand and suspended matters in the water can reach more than 80%, the removal rate of ammonia nitrogen in the wastewater reaches more than 75%, and the pollutant removal efficiency is high;
4. low construction cost and low operation cost
The integrated combined device can be used for realizing factory prefabrication and field installation, greatly reducing the field labor intensity and the fault occurrence rate, can be buried under the ground or placed above the ground, is simple to operate and convenient to maintain, and has higher cost performance; meanwhile, the system fully utilizes all levels of nutrition sources naturally existing in rain and sewage, does not need to additionally add medicines, fully utilizes the sludge backflow effect to reduce the sludge amount, avoids filler blockage and reduces the filler replacement frequency, and the main component of the generated sludge is microbial activated sludge, so that the system is nontoxic and harmless, can be used for landfilling nearby or coastal greening, saves the operation and maintenance cost and reduces the periodic investment;
5. safety and environmental protection
The device for implementing the invention is built by adopting environment-friendly materials, the raw materials are natural, the green plants, the microbial activated sludge, the protozoa and the natural filler matrix are fully utilized to construct a biological membrane reactor system with the function of efficiently degrading pollutants, the risk of inflammability and explosiveness does not exist, no chemical agent is added, no manual special cleaning is needed, and secondary pollution such as odor, noise and the like is not generated during daily operation;
6. the ecological landscape effect is obvious, and the ecological landscape effect is in complement with the natural environment
The invention integrates the design concept of ecological landscape, adopts the combination and collocation of green plants in wet environment, builds the green natural landscape of water body, has high ecological benefit, has certain landscape greening effect and ornamental value while purifying water pollution and enhancing the self-cleaning capability of water body, has the environment protection function of biological absorption and continuous degradation of environmental pollutants, also highlights the environment landscape greening effect of green plants, and complements the natural ecological landscape around river channels and lakes;
the ecological filtering method for rain and sewage overflow port treatment simulates the self-cleaning function of a natural ecological system, ecologically cuts the rain and sewage at the overflow port and purifies the water quality step by step, reduces the water pollution load entering rivers and lakes from the source, and has the treatment advantages of high pollution control efficiency, low influence degree, low energy consumption, automatic balance adjustment, simple and convenient operation, low construction cost, low operation cost and the like.
Drawings
FIG. 1 is a process flow diagram of an ecological filtration method for rain and sewage overflow port remediation of the present invention;
FIG. 2 is a front cross-sectional block diagram of an ecological filter dam water treatment apparatus for practicing the present invention;
in the figure: the device comprises a regulating tank 1, a purifying tank 2, a filtering tank 3, a clean water tank 4 and an aeration device 5;
the conditioning tank 1 includes: the sewage treatment system comprises a first sewage outlet 1-1, a first water outlet pipe 1-2, a first settling tank 1-3, a second settling tank 1-4 and a communicating pipe 1-5;
the purification tank 2 includes: 2-1 parts of plant cultivation layer, 2-2 parts of adsorption layer, 2-3 parts of first biological contact oxidation pond, 2-4 parts of first porous partition board, 2-5 parts of second sewage outlet and 2-6 parts of water outlet hole;
the plant-growing layer 2-1 includes: 2-11 parts of porous cover plates, 2-12 parts of planting baskets (not marked in the figure), 2-13 parts of culture matrixes and 2-14 parts of plant root systems;
the first biological contact oxidation cell 2-3 includes: 2-31 parts of first carbon fiber artificial aquatic plants, 2-32 parts of first membranous biopolymers (not marked in the figure) and 2-33 parts of first hollow porous suspending balls;
the filter tank 3 includes: the second biological contact oxidation pond 3-1, the medium filtering layer 3-2, the catchment channel cavity 3-3, the dynamic aeration chamber 3-4, the second porous partition plate 3-5, the third sewage outlet 3-6 and the second water outlet pipe 3-7;
the second biological contact oxidation cell 3-1 includes: 3-11 parts of second carbon fiber artificial aquatic plants, 3-12 parts of second membranous biopolymers (not marked in the figure) and 3-13 parts of second hollow porous suspending balls;
the medium filter layer 3-2 includes: 3-21 parts of smokeless coal bed, 3-22 parts of manganese sand layer, 3-23 parts of active carbon particle layer, 3-24 parts of quartz sand layer and 3-25 parts of interception net;
the dynamic aeration chamber 3-4 comprises: oxygen-increasing pump 3-41, vent 3-42 (not labeled in the figure);
the clean water tank 4 includes: the third water outlet pipe 4-1, the first grid 4-2, the second grid 4-3 and the siphon 4-4.
Detailed Description
The invention is described in further detail below with reference to the drawings and specific examples.
In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the invention.
According to the water quality characteristics of good biodegradability (BOD/COD > 0.3) of the overflow port, the ecological filtering method for treating the rain and sewage overflow port is designed.
As shown in fig. 1, the ecological filtering method comprises the following steps:
firstly, water quality is adjusted, sewage flowing out of a rain and sewage overflow port is subjected to primary separation, sediment and suspended matter impurities with larger specific gravity are separated by utilizing gravity sedimentation, and the separated sediment and suspended matter impurities are collected.
As shown in FIG. 2, which is a structural diagram of an ecological filter dam water treatment apparatus for implementing the present invention, the apparatus is designed to treat water with a volume of 10m 3 And/h, including a regulating tank 1 arranged below the rain and sewage overflow port, wherein the regulating tank 1 is sequentially connected with a purifying tank 2, a filtering tank 3 and a clean water tank 4 in series, and the bottom ends of the regulating tank 1, the purifying tank 2, the filtering tank 3 and the clean water tank 4 are all positioned on the same horizontal line. The device can be buried under the ground surface or placed on the ground surface, and the whole device can be manufactured by adopting a concrete structure, a steel structure or PE material through welding, is self-integrated and has a compact structure.
The water quality in the first step is regulated in the regulating tank 1, and the hydraulic retention time of the sewage in the regulating tank 1 is not less than 30min.
The regulating tank 1 comprises first sedimentation grooves 1-3 and second sedimentation grooves 1-4 which are arranged in series, a plurality of communicating pipes 1-5 which are arranged at intervals are communicated between the first sedimentation grooves 1-3 and the second sedimentation grooves 1-4, stainless steel wire nets for intercepting sheet-shaped or granular pollutants are wrapped at water inlets and water outlets of the communicating pipes 1-5, first sewage outlets 1-1 are arranged at the bottom ends of the first sedimentation grooves 1-3 and the second sedimentation grooves 1-4, and first water outlet pipes 1-2 which are arranged at intervals are communicated at the upper parts of side walls of the second sedimentation grooves 1-4.
The length and width of the regulating tank 1 are 200cm multiplied by 250cm multiplied by 180cm, the water inlet end of the regulating tank 1 is connected with an external sewage receiving cofferdam (groove), the distance between the first water outlet pipe 1-2 and the top end of the regulating tank 1 is 30cm, the diameter is 100mm, and the first sewage draining outlet 1-1 is of an inverted cone structure.
The sewage after filtration flows into the first sedimentation tank 1-3 in the regulating tank 1 by means of self gravity, sediment and suspended matter impurities with larger specific gravity are primarily separated through gravity sedimentation, the balanced sewage is drained to the second sedimentation tank 1-4 by means of water pressure through the communicating pipe 1-5, the communicating pipe 1-5 intercepts flaky or granular pollutants through the stainless steel wire mesh arranged at the water inlet and the water outlet, and the sediment and suspended matter impurities with larger specific gravity are separated from the sewage in the second sedimentation tank 1-4 again through gravity sedimentation, and the separated sediment and suspended matter impurities are collected by the first sewage outlet 1-1.
Step two, water quality purification, namely firstly intercepting larger colloid particles in sewage through a plant cultivation matrix, then absorbing and converting nitrogen and phosphorus nutritive salts in the sewage through plant roots, then absorbing organic pollutants in the sewage through hollow fiber balls and columnar porous activated carbon, finally converting ammonia nitrogen in the sewage into nitronitrogen through biochemical treatment by utilizing aerobic layer microorganisms outside microbial membranes, and converting easily-decomposed small molecular organic matters in the sewage into CO 2 And H 2 O, converting inorganic phosphorus in sewage into adenosine triphosphate in cell body, and converting nitro nitrogen into N by utilizing anaerobic layer microbe in microbial film 2 The macromolecular organic matters which are difficult to decompose in the sewage are converted into the micromolecular organic matters which are easy to degrade.
And step two, water quality purification is carried out in the purifying tank 2, and the hydraulic retention time of sewage in the purifying tank 2 is not less than 60 minutes.
The purifying pond 2 comprises a first plant cultivation layer 2-1, a second adsorption layer 2-2 and a third biological contact oxidation pond 2-3 which are sequentially arranged from top to bottom, and a first porous partition plate 2-4 is arranged between two adjacent layers. The first porous separator 2-4 is a porous PE separator of stainless steel mesh or non-woven fabric.
The height of the plant cultivation layer 2-1 is about 60cm, the top end of the plant cultivation layer is paved with a porous cover plate 2-11, and the pore sizes of the porous cover plates 2-11 are uniform. The planting basket 2-12 for planting the green plants is firmly placed in the holes of the porous cover plate 2-11, the green plants are exposed on the ground, and the planting basket 2-12 is matched with the hole diameter of the porous cover plate 2-11. The planting basket 2-12 is internally provided with a cultivation substrate 2-13 for fixing green plants in wet life and intercepting colloid particles in sewage, the lower end of the planting basket 2-12 is provided with a plant root system layer 2-14 for absorbing and converting nitrogen and phosphorus nutritive salts in sewage, and the first water outlet pipe 1-2 is horizontally and uniformly inserted into the plant root system layer 2-14 and serves as a water distribution pipe for uniformly feeding water.
Preferably, the green plants in the planting basket 2-12 comprise canna, windmill bamboo, rohdea japonica, tortoise back bamboo, iris, calamus and allium mongolicum, and the cultivation substrate 2-13 comprises quartz sand and zeolite mixture with the particle size of 2-4 mm according to the weight ratio of 1:1, plays roles of fixing green plants in wet life and intercepting colloid particles in sewage. The plant root system layer 2-14 comprises an upper layer of hard porous ceramsite and a lower layer of vesuvianite, wherein the particle sizes of the hard porous ceramsite and the vesuvianite are 8-12 mm, and the weight ratio of the hard porous ceramsite to the vesuvianite is 1:1, the wet green plant root system naturally extends in the plant root system layer 2-14, so that the hard porous ceramsite and the vesuvianite are not easy to be blocked. The growth of the adjacent planted wet plants is not affected, and the plant root system extends between the ceramsite and the volcanic, and absorbs and converts N, P nutrient salt pollutants of sewage in gaps between the ceramsite and the volcanic. In addition, the hard porous ceramsite and the vesuvianite can provide perching carriers for microbial films.
The height of the adsorption layer 2-2 is about 60cm, the adsorption layer comprises an upper hollow fiber ball and a lower columnar porous activated carbon, the particle size of the hollow fiber ball is 3-5 mm, and the particle size of the columnar porous activated carbon is 3-5 mm. The adsorption layer 2-2 provides habitat for microorganisms while adsorbing organic pollutants in water, so as to form a biological activated carbon adsorption film, and the organic pollutants at all levels are converted and degraded through the metabolism of the microorganisms.
The height of the first biological contact oxidation pond 2-3 is about 60cm, the first biological contact oxidation pond comprises a plurality of first carbon fiber artificial aquatic weeds 2-31 which are suspended up and down, a first membranous biopolymer 2-32 for degrading organic pollutants in sewage is attached to the periphery of each first carbon fiber artificial aquatic weed 2-31, the first membranous biopolymer 2-32 comprises an aerobic layer outside a membrane, a facultative layer in the membrane and an anaerobic layer in the membrane, a first hollow porous suspending ball 2-33 is arranged at the tail end of each first carbon fiber artificial aquatic weed 2-31, activated carbon particles for fixing microbial membranes are filled in the first hollow porous suspending ball 2-33, an aeration device 5 is arranged at the bottom end of each first biological contact oxidation pond 2-3, a second sewage drain outlet 2-5 is also arranged at the bottom end of each first biological contact oxidation pond 2-3, and each second sewage drain outlet 2-5 is in an inverted cone structure. The bottom end of the side wall of the first biological contact oxidation pond 2-3, which is close to the filtering pond 3, is communicated with 4 water outlet holes 2-6, the aperture of the water outlet holes 2-6 is 200mm, the water outlet holes are arranged at intervals along the width direction of the side wall of the first biological contact oxidation pond 2-3, and water flows to the bottom of the filtering pond 3 automatically.
The aeration device 5 is an aeration pipe or an aeration disc, plays a role in aeration and oxygenation, and provides oxygen for the metabolism process of aerobic microorganisms and hydroponic plants.
The microbial membrane fixed by the first membranous biopolymer 2-32 and the first hollow porous suspending ball 2-33 converts ammonia nitrogen in the sewage into nitronitrogen through the aerobic layer microorganism outside the membrane, and converts small molecular organic matters which are easy to decompose in the sewage into CO 2 And H 2 O, inorganic phosphorus in sewage is converted into adenosine triphosphate in cell body, and nitro nitrogen is converted into N by anaerobic layer microorganism in membrane 2 The macromolecular organic matters which are difficult to decompose in the sewage are converted into the easily degradable micromolecular organic matters, and the impurities with larger specific gravity and separated by gravity sedimentation are removed through the second sewage outlet 2-5.
And thirdly, filtering water, namely continuously performing biochemical treatment on the sewage to prolong the biochemical treatment time, filtering the sewage with multiple media, on one hand, deeply intercepting and adsorbing extremely fine suspended particles and colloid, on the other hand, enriching active microorganisms to improve the concentration of the active microorganisms, and finally, aggregating the filtered clear water.
The water quality filtration in the third step is carried out in the filter tank 3, and the hydraulic retention time of the sewage in the filter tank 3 is not less than 30min.
The filter tank 3 comprises a second biological contact oxidation tank 3-1, a medium filter layer 3-2 and a catchment channel cavity 3-3 which are sequentially arranged from bottom to top, a second porous partition plate 3-5 is arranged between two adjacent layers, and a dynamic aeration chamber 3-4 is arranged at the top end of the catchment channel cavity 3-3.
The second biological contact oxidation pond 3-1 is about 60cm in height and is symmetrically arranged with the first biological contact oxidation pond 2-3, a third sewage outlet 3-6 is formed in the bottom end of the second biological contact oxidation pond, and the water outlet 2-6 is communicated with the second biological contact oxidation pond 3-1. The second biological contact oxidation pond 3-1 includes a plurality of second carbon fiber artificial pasture and water 3-11 that hang from top to bottom, every second carbon fiber artificial pasture and water 3-11 periphery is attached with the second membranous biopolymer 3-12 that is used for degrading organic pollutant in the sewage, second membranous biopolymer 3-12 includes the aerobic layer outside the membrane, the facultative layer in the membrane and the anaerobic layer in the membrane, every second membranous biopolymer 3-12 end is provided with second cavity porous suspension ball 3-13, the inside activated carbon granule that is used for the fixed microbial film that is filled of second cavity porous suspension ball 3-13, second biological contact oxidation pond 3-1 bottom is provided with aeration equipment 5. The aeration device 5 is an aeration pipe or an aeration disc, plays a role in aeration and oxygenation, and provides oxygen for the metabolism process of aerobic microorganisms and hydroponic plants.
The sewage after biochemical treatment at the bottom of the first biological contact oxidation pond 2-3 naturally flows into the second biological contact oxidation pond 3-1 in the filter pond 3 along the water outlet hole 2-6, the second membranous biopolymer 3-12 attached to the outer surface of the second carbon fiber artificial aquatic weed 3-11 and the microbial membrane fixed by the second hollow porous suspending ball 3-13 continue biochemical treatment on the sewage, and the biochemical treatment time is prolonged.
Second membranous biopolymer 3-12, and the firstThe microbial membrane fixed by the two hollow porous suspending balls 3-13 converts ammonia nitrogen in the sewage into nitro nitrogen through aerobic layer microorganisms outside the membrane, and converts small molecular organic matters which are easy to decompose in the sewage into CO 2 And H 2 O, inorganic phosphorus in sewage is converted into adenosine triphosphate in cell body, and nitro nitrogen is converted into N by anaerobic layer microorganism in membrane 2 The macromolecular organic matters which are difficult to decompose in the sewage are converted into the easily degradable micromolecular organic matters, and the impurities with larger specific gravity and separated by gravity sedimentation are removed through the third sewage outlet 3-6.
The height of the medium filter layer 3-2 is about 60cm, the medium filter layer comprises a smokeless coal layer 3-21, a manganese sand layer 3-22, an activated carbon particle layer 3-23 and a quartz sand layer 3-24 which are sequentially filled from bottom to top, the heights of the medium filter layers are generally consistent, each medium filter layer is about 15cm, and a interception net 3-25 for intercepting fine suspended particles or fine colloid is arranged between every two adjacent layers.
The smokeless coal bed 3-21 comprises anthracite with the grain diameter of 2-4 mm, the manganese sand layer 3-22 comprises manganese sand with the grain diameter of 1.5-3 mm, the activated carbon grain layer 3-23 comprises activated carbon with the grain diameter of 1.2-2 mm, the quartz sand layer 3-24 comprises quartz sand with the grain diameter of 0.8-1.5 mm, the interception net 3-25 is stainless steel wires or non-woven fabrics with the mesh diameter of 0.8-1 mm, and the interception net 3-25 plays roles of intercepting and preventing filter materials from losing along with water.
The sewage enters a medium filter layer 3-2, and the combined multi-medium filter material deeply intercepts and adsorbs extremely fine suspended particles and colloid on one hand, enriches active microorganisms on the other hand, improves the concentration of the active microorganisms, and further enhances the bioconversion and metabolic degradation capability.
The height of the catchment channel cavity 3-3 is about 30cm, the catchment channel cavity plays a role in collecting filtered water, and pebbles are filled in the catchment channel cavity. The middle part of the side wall of the catchment channel cavity 3-3, which is close to the clean water tank 4, is communicated with 4 second water outlet pipes 3-7, the diameter of each second water outlet pipe 3-7 is 100mm, and the second water outlet pipes are arranged at intervals along the width direction of the side wall of the catchment channel cavity 3-3. The 4 second water outlet pipes 3-7 are horizontally inserted in the water collecting channel cavity 3-3, and the water inlets and the water outlets of the second water outlet pipes 3-7 are respectively wrapped with stainless steel wire meshes for intercepting sheet-shaped or granular pollutants.
The height of the power aeration chamber 3-4 is about 30cm, 2 aeration pumps 3-41 are arranged in the power aeration chamber, the aeration pumps 3-41 are connected with the aeration device 5, and the top end of the power aeration chamber 3-4 is provided with an air vent 3-42 communicated with the outside atmosphere.
Specifically, the power=60-80W and the air quantity=60-70L/min of the oxygenation pump 3-41 are fixed on a seamless sealing plate, the oxygenation pump 3-41 and the aeration device 5 pass through the catchment channel cavity 3-3 and the medium filter layer 3-2 through a steel wire hose in a seamless way until reaching the bottom of the second biological contact oxidation pond 3-1, are connected with the aeration device 5 at the bottom of the first biological contact oxidation pond 2-3 and the bottom of the second biological contact oxidation pond 3-1, play a role in aeration oxygenation, provide sufficient dissolved oxygen for the metabolism process of aerobic microorganisms and hydroponic plants, and have the dissolved oxygen content in the range of 3.0-5.0 mg/L.
And fourthly, collecting the clear water, collecting the collected clear water, and finally naturally flowing into a nearby river.
And step four, collecting the clear water in the clear water tank 4, wherein the hydraulic retention time of the clear water in the clear water tank 4 is not less than 15min.
The upper part of the clear water pond 4, which is close to the external side wall, is communicated with a third water outlet pipe 4-1, clear water automatically flows out of the third water outlet pipe 4-1 and finally flows into a nearby river or lake water area.
The clean water tank 4 comprises a first grid 4-2 and a second grid 4-3 which are arranged in series, 4 siphons 4-4 which are arranged at intervals in the width direction are communicated between the first grid 4-2 and the second grid 4-3, the diameter of each siphon 4-4 is 100mm, and a water inlet and a water outlet of each siphon 4-4 are wrapped with a stainless steel wire mesh for intercepting sheet-shaped or granular pollutants. The third water outlet pipes 4-1 are arranged at intervals along the width direction of the side wall of the second grid 4-3.
In addition, when the ecological filtering dam water treatment device is buried under the ground, the first sewage outlet 1-1, the second sewage outlet 2-5 and the third sewage outlet 3-6 are externally connected with a mud sucking pump.
The specific implementation mode of the ecological filtering method for rain and sewage overflow port treatment is as follows:
the rain and sewage flowing out of the overflow port firstly enters a pre-pretreated cofferdam to store water and adjust peak; the water discharged from the cofferdam automatically flows to the water inlet of the ecological filtering dam water treatment device, the water quantity is regulated in the regulating tank 1, the water quality is uniform, the discharged water enters the purifying tank 2 after primary gravity sedimentation treatment, the water pollutants are converted step by step under the metabolism of plant root systems and microbial membranes, finally, the water pollutants are adsorbed and trapped by the filtering tank 3, fine pollution impurities in the purified water are filtered, the filtered water finally enters the clean water tank 4, and the clarified discharged water automatically flows to the water again, so that the in-situ conversion and degradation of the pollutants in the rain sewage are realized.
The invention utilizes a plurality of synergistic effects of physics, chemistry and biology to purify water quality, can continuously trap active microorganisms in the purifying tank 2, continuously purify water pollutants, improve the concentration of the active microorganisms, increase the conversion and degradation capacity of metabolism, improve hydrodynamic force, improve the reoxygenation efficiency of water body, improve the water quality index of the water body, and have double effects of purifying water quality and maintaining the water body.
The invention realizes the interception, absorption, degradation and conversion of suspended matters, colloid particles, nitrogen and phosphorus (N, P) nutritive salts and soluble organic pollutants in sewage at overflow ports of rivers and lakes, removes pollutants, ensures that the water quality of the effluent at the overflow ports after the rain and the sewage are treated can reach the first-level A standard of pollutant emission standard of urban sewage treatment plants of GB18918-2002, ensures that the removal rate of pollution indexes such as Total Nitrogen (TN), total Phosphorus (TP), chemical Oxygen Demand (COD) and suspended matters (SS) in the water can reach more than 80 percent, ensures that the removal rate of ammonia nitrogen (NH 3-N) in the wastewater can also reach more than 75 percent, and reduces the pollution load of river and lake water from the source.
In summary, the invention is based on the biological membrane filtration technology (Biofilm Filtration Technology, abbreviated as BFT), the independently developed ecological filtration method simulates the natural ecological system self-cleaning process, creatively combines the artificial wetland process with the biological contact oxidation method, forms a micro-ecological balance system with high biological activity by means of the mutual effect and the synergistic effect, has excellent environmental protection functions such as solid-liquid separation, adsorption filtration, biological degradation and the like, continuously purifies pollutants at an overflow port, controls the pollution load of the river and the lake from the source, improves the hydrodynamic force of the river and the lake, promotes the reoxygenation efficiency of the water body, optimizes the biological population structure, enhances the self-cleaning and restoration functions of the water body, and fundamentally solves the problem of water pollution of the overflow port of the river and the lake; meanwhile, the invention integrates the design concept of ecological landscape, enhances the pollution resistance and self-cleaning capability of the water body, has a certain landscape greening effect and ornamental value, has the environment-friendly function of biological absorption and continuous degradation of environmental pollutants, and also highlights the environment landscape greening effect of green plants. The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (10)
1. An ecological filtering method for rain and sewage overflow port treatment is characterized by comprising the following steps:
firstly, water quality adjustment, namely performing primary separation on sewage flowing out of a rain and sewage overflow port, separating out sediment and suspended matter impurities with larger specific gravity by utilizing gravity sedimentation, and collecting the separated sediment and suspended matter impurities;
step two, water quality purification, namely firstly intercepting larger colloid particles in sewage through a plant cultivation matrix, then absorbing and converting nitrogen and phosphorus nutritive salts in the sewage through plant roots, then absorbing organic pollutants in the sewage through hollow fiber balls and columnar porous activated carbon, finally converting ammonia nitrogen in the sewage into nitronitrogen through biochemical treatment by utilizing aerobic layer microorganisms outside microbial membranes, and converting easily-decomposed small molecular organic matters in the sewage into CO 2 And H 2 O, converting inorganic phosphorus in sewage into adenosine triphosphate in cell body, and converting nitro nitrogen into N by utilizing anaerobic layer microbe in microbial film 2 Converting macromolecular organic matters which are difficult to decompose in the sewage into small molecular organic matters which are easy to degrade;
step three, water quality filtration, namely, continuously carrying out biochemical treatment on the sewage to prolong the biochemical treatment time, then carrying out multi-medium filtration on the sewage, on one hand, deeply intercepting and adsorbing extremely fine suspended particles and colloid, on the other hand, enriching active microorganisms to improve the concentration of the active microorganisms, and finally, gathering the filtered clear water;
and fourthly, collecting the clear water, collecting the collected clear water, and finally naturally flowing into a nearby river.
2. The ecological filtration method for rain and sewage overflow port treatment according to claim 1, characterized in that: in the first step, water quality adjustment is carried out in the adjusting tank (1), the adjusting tank (1) comprises a first sedimentation tank (1-3) and a second sedimentation tank (1-4) which are arranged in series, a plurality of communicating pipes (1-5) which are arranged at intervals are communicated between the first sedimentation tank (1-3) and the second sedimentation tank (1-4), stainless steel wire nets for intercepting flaky or granular pollutants are wrapped at the water inlets and the water outlets of the communicating pipes (1-5), a first sewage outlet (1-1) is arranged at the bottom ends of the first sedimentation tank (1-3) and the second sedimentation tank (1-4), and a first water outlet pipe (1-2) which is arranged at intervals is communicated with the upper part of the side wall of the second sedimentation tank (1-4).
3. The ecological filtration method for rain and sewage overflow port treatment according to claim 2, characterized in that: in the second step, water quality purification is carried out in a purifying tank (2), wherein the purifying tank (2) comprises a plant cultivation layer (2-1), an adsorption layer (2-2) and a first biological contact oxidation tank (2-3) which are sequentially arranged from top to bottom, and a first porous partition plate (2-4) is arranged between two adjacent layers; the planting device is characterized in that a porous cover plate (2-11) is paved at the top end of the plant cultivation layer (2-1), a planting basket (2-12) for planting green plants is arranged in a hole of the porous cover plate (2-11), a cultivation substrate (2-13) for fixing the green plants and intercepting colloid particles in sewage is arranged in the planting basket (2-12), a plant root system layer (2-14) for absorbing and converting nitrogen and phosphorus nutrient salts in the sewage is arranged at the lower end of the planting basket (2-12), and the first water outlet pipe (1-2) is inserted into the plant root system layer (2-14); the first biological contact oxidation pond (2-3) include a plurality of first carbon fiber artificial pasture and water (2-31) that hang from top to bottom, every first carbon fiber artificial pasture and water (2-31) periphery is attached with first membranous biopolymer (2-32) that are arranged in degrading organic pollutant in the sewage, first membranous biopolymer (2-32) are including the aerobic layer outside the membrane, the facultative layer in the membrane and the anaerobism layer in the membrane, every first carbon fiber artificial pasture and water (2-31) end is provided with first cavity porous suspension ball (2-33), the inside active carbon granule that is used for fixed microbial film that fills of first cavity porous suspension ball (2-33), first biological contact oxidation pond (2-3) bottom is provided with aeration equipment (5), first biological contact oxidation pond (2-3) bottom still is provided with second mouth (2-5), first biological contact oxidation pond (2-3) lateral wall intercommunication has out water hole (2-6).
4. The ecological filtering method for rain and sewage overflow port treatment according to claim 3, wherein: in the second step, the wet green plants in the field planting basket (2-12) comprise canna, windmill bamboo, rohdea japonica, tortoise back bamboo, iris, calamus and allium mongolicum, the cultivation matrix (2-13) comprises quartz sand with the particle size of 2-4 mm and zeolite mixture, the plant root system layer (2-14) comprises upper hard porous ceramsite and lower volcanic rock, and the particle sizes of the hard porous ceramsite and the volcanic rock are 8-12 mm; the adsorption layer (2-2) comprises an upper hollow fiber ball and a lower columnar porous active carbon, wherein the particle size of the hollow fiber ball is 3-5 mm, and the particle size of the columnar porous active carbon is 3-5 mm; the water outlet holes (2-6) are arranged at intervals along the side wall of the first biological contact oxidation pond (2-3).
5. The ecological filtering method for rain and sewage overflow port treatment according to claim 3 or 4, characterized in that: in the third step, water quality filtration is carried out in a filter tank (3), the filter tank (3) comprises a second biological contact oxidation tank (3-1), a medium filter layer (3-2) and a water collecting channel cavity (3-3) which are sequentially arranged from bottom to top, a second porous partition plate (3-5) is arranged between two adjacent layers, and a power aeration chamber (3-4) is arranged at the top end of the water collecting channel cavity (3-3); a third sewage outlet (3-6) is arranged at the bottom end of the second biological contact oxidation pond (3-1); pebbles are filled in the catchment channel cavity (3-3), and a second water outlet pipe (3-7) is communicated with the middle part of the side wall of the catchment channel cavity (3-3); the power aeration chamber (3-4) is internally provided with an oxygenation pump (3-41), the oxygenation pump (3-41) is connected with the aeration device (5), and the top end of the power aeration chamber (3-4) is provided with a vent hole (3-42) communicated with the outside atmosphere.
6. The ecological filtering method for rain and sewage overflow port treatment according to claim 5, wherein: in the third step, the second biological contact oxidation pond (3-1) comprises a plurality of second carbon fiber artificial aquatic weeds (3-11) which are hung up and down, a second membranous biopolymer (3-12) for degrading organic pollutants in sewage is attached to the periphery of each second carbon fiber artificial aquatic weed (3-11), the second membranous biopolymer (3-12) comprises an aerobic layer outside a membrane, a facultative layer in the membrane and an anaerobic layer in the membrane, a second hollow porous suspending ball (3-13) is arranged at the tail end of each second membranous biopolymer (3-12), activated carbon particles for fixing microbial membranes are filled in the second hollow porous suspending ball (3-13), and an aeration device (5) is arranged at the bottom end of the second biological contact oxidation pond (3-1); the medium filter layer (3-2) comprises a smokeless coal layer (3-21), a manganese sand layer (3-22), an active carbon particle layer (3-23) and a quartz sand layer (3-24) which are sequentially filled from bottom to top, and a interception net (3-25) for intercepting fine suspended particles or fine colloid is arranged between two adjacent layers.
7. The ecological filtering method for rain and sewage overflow port treatment according to claim 6, wherein: in the third step, the smokeless coal bed (3-21) comprises anthracite with the particle size of 2-4 mm, the manganese sand layer (3-22) comprises manganese sand with the particle size of 1.5-3 mm, the activated carbon particle layer (3-23) comprises activated carbon with the particle size of 1.2-2 mm, the quartz sand layer (3-24) comprises quartz sand with the particle size of 0.8-1.5 mm, and the interception net (3-25) is stainless steel wires or non-woven fabrics with the mesh size of 0.8-1 mm; the second water outlet pipes (3-7) are arranged at intervals along the side wall of the water collecting channel cavity (3-3).
8. The ecological filtering method for rain and sewage overflow port treatment according to claim 5, wherein: the first sewage outlet (1-1), the second sewage outlet (2-5) and the third sewage outlet (3-6) are of inverted cone structures.
9. The ecological filtration method for rain and sewage overflow port treatment according to claim 1, characterized in that: in the fourth step, clean water is collected in the clean water tank (4), the clean water tank (4) comprises a first grid (4-2) and a second grid (4-3) which are arranged in series, a plurality of siphons (4-4) which are arranged at intervals are communicated between the first grid (4-2) and the second grid (4-3), a stainless steel wire net for intercepting flaky or granular pollutants is arranged at the water inlet and the water outlet of each siphon (4-4), and a third water outlet pipe (4-1) is communicated with the upper part of the side wall of the second grid (4-3) close to the outside.
10. The ecological filtration method for rain and sewage overflow port treatment according to claim 1, characterized in that: the hydraulic retention time of the sewage in the water quality adjusting process is not less than 30min, the hydraulic retention time of the sewage in the water quality purifying process is not less than 60min, the hydraulic retention time of the sewage in the water quality filtering process is not less than 30min, and the hydraulic retention time of the clear water in the clear water collecting process is not less than 15min.
Priority Applications (1)
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| CN116655168A (en) * | 2023-06-25 | 2023-08-29 | 生态环境部华南环境科学研究所(生态环境部生态环境应急研究所) | Ecological pond system for rapidly intercepting pollutants under initial rain condition to stabilize and purify water quality |
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