CN111362524A - High-efficiency low-consumption village and town sewage treatment system and method for enabling effluent to reach IV-class water on ground surface - Google Patents
High-efficiency low-consumption village and town sewage treatment system and method for enabling effluent to reach IV-class water on ground surface Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 60
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- 206010021143 Hypoxia Diseases 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention discloses a system and a method for treating sewage in villages and small towns, wherein the sewage can reach surface IV water with high efficiency and low consumption, and the method comprises the following steps: the pretreatment module is provided with a sewage inlet and a water outlet, and the water outlet is sequentially connected with the enhanced biological treatment module and the advanced treatment module; the deep processing module is provided with a standard water outlet; the automatic control module is respectively and electrically connected with the pretreatment module, the enhanced biological treatment module and the advanced treatment module, and can cooperatively control the pretreatment module, the enhanced biological treatment module and the advanced treatment module to perform village and town sewage treatment. The sludge discharge control system can meet high discharge standards with minimum resource and energy consumption, reduces the sludge yield to the maximum extent, is flexible to adjust, can realize unattended automatic control, has process performance superior to the similar process technical level of advanced countries in the world, and fills up the blank of related domestic fields.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a system and a method for treating town sewage with high efficiency and low consumption of effluent reaching surface IV water.
Background
The low carbon-nitrogen ratio of the sewage in villages and towns in China is remarkable, the utilization efficiency of a carbon source in the sewage is low by a conventional biological denitrification process, the total nitrogen reaches the standard and needs to be added by an external carbon source, and the problem of high stable operation cost exists. In addition, the concentration of organic matters in sewage inflow of villages and towns is too low, the fluctuation of water quality and water quantity is large, and the traditional process design cannot stably operate in the actual operation process.
At present, A/O, A is mostly adopted for village and town sewage2The O process or the SBR process can meet the discharge standard of the first-class A in the pollutant discharge standard of the urban sewage treatment plant, but along with the higher discharge requirement of the coming of a plurality of local standards on the environmental comprehensive treatment, the drainage standard of the village and town sewage treatment needs to meet the requirement of the IV-class standard of the environmental quality standard of surface water (GB3838-2002), but because the traditional process has the problems of low removal rate of denitrification and phosphorus removal and the need of adding a large amount of additional carbon sources, the operation cost is not high, the stable operation cannot be completely ensured, and the discharge can not reach the discharge standard of the pollutant discharge standard of the water pollutants of Minjiang and Tuojiang river basin (DB 51/2311-.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a system and a method for treating village and town sewage with high efficiency and low consumption, wherein the water outlet of the system and the method reaches surface IV water, and the system and the method can solve the problems that the existing village and town sewage is high in operation cost and unstable in operation, so that the discharge can not reach the discharge standard of water pollutants of Minjiang and Tuo river basin (DB 51/2311-.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides a village and town sewage treatment system with high efficiency and low consumption of effluent reaching IV class water on the ground surface, which comprises:
the system comprises a pretreatment module, an enhanced biological treatment module, a deep treatment module and an automatic control module; wherein,
the pretreatment module is provided with a sewage inlet and a water outlet, and the water outlet is sequentially connected with the enhanced biological treatment module and the advanced treatment module;
the deep processing module is provided with a standard water outlet;
the automatic control module is respectively electrically connected with the pretreatment module, the enhanced biological treatment module and the advanced treatment module and can cooperatively control the pretreatment module, the enhanced biological treatment module and the advanced treatment module to carry out village and town sewage treatment.
The embodiment of the invention also provides a village and town sewage treatment method with high efficiency and low consumption of effluent reaching IV-class water on the ground surface, and the system comprises the following steps:
a pretreatment step: the treated sewage of villages and towns enters a pretreatment module, suspended matters, floaters, gravels and the like in the sewage are removed through filtering and precipitation, and the effluent after pretreatment enters a reinforced biological treatment module;
and (3) strengthening biological treatment: after the sewage enters the enhanced biological treatment module, sequentially carrying out enhanced biological treatment, and enabling the treated effluent to enter the advanced treatment module;
a deep treatment step: the entering sewage is sequentially subjected to flocculation precipitation, filtration and disinfection treatment.
According to the technical scheme provided by the invention, the system and the method for treating the sewage in the villages and the towns, which have the advantages that the high-efficiency and low-consumption effluent reaches the IV-class water on the ground surface, have the following beneficial effects:
the sustainable denitrification dephosphorization process is taken as a prototype, through scientific and reasonable design and optimization, the high-emission standard is met with the minimum resource and energy consumption, the sludge yield is reduced to the maximum extent, the adjustment is flexible, the unattended automatic control can be realized, the process performance is ahead of the similar process technical level of advanced countries in the world, and the blank of related fields in China is filled.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic configuration diagram of a village and town sewage treatment system provided by an embodiment of the invention;
FIG. 2 is a schematic view of an enhanced biological treatment module of a village and town sewage treatment system provided by an embodiment of the present invention;
fig. 3 is a detailed flow chart of a village and town sewage treatment method provided by the embodiment of the invention;
fig. 4 is a detailed flow chart of a village and town sewage treatment method provided by the embodiment of the invention;
the parts corresponding to the individual symbols in fig. 1 are: 100-a pretreatment module; 200-an enhanced biological treatment module; 300-a depth processing module; 400-automatic control module;
the parts corresponding to the individual labels in fig. 2 are: 1-an anaerobic tank; 2-selecting a pool; 3-an anoxic tank; 4-a post-anoxic tank; 5-an aerobic tank; 6-secondary sedimentation tank; 7-a reflux pump from the aerobic tank to the anoxic tank; 8-a reflux pump from the aerobic tank to the back anoxic tank; 9-a valve; 10-a flow meter; 11-a flow pusher; 12-an aeration device; 13-a fan; 14-sludge recirculation pump; 15-excess sludge pump; 16-water inlet pipe network.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific contents of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a system for treating sewage from villages and small towns, which has high efficiency and low consumption, and can discharge water to surface IV water, comprising:
the system comprises a pretreatment module, an enhanced biological treatment module, a deep treatment module and an automatic control module; wherein,
the pretreatment module is provided with a sewage inlet and a water outlet, and the water outlet is sequentially connected with the enhanced biological treatment module and the advanced treatment module;
the deep processing module is provided with a standard water outlet;
the automatic control module is respectively electrically connected with the pretreatment module, the enhanced biological treatment module and the advanced treatment module and can cooperatively control the pretreatment module, the enhanced biological treatment module and the advanced treatment module to carry out village and town sewage treatment.
The preprocessing module in the system comprises:
the thick grating and the thin grating are connected in sequence. The two-stage grating can remove large suspended substances and floating objects in the sewage.
The preprocessing module in the system further comprises: and the adjusting tank is connected behind the fine grating. The adjusting tank adopts a grit chamber comprising a mud bucket and a mud discharging device, can remove sand in sewage and can balance water quality and water quantity.
As shown in fig. 2, in the system, the enhanced biological treatment module includes:
the anaerobic tank, the selection tank, the oxygen deficiency tank, the back oxygen deficiency tank and the aerobic tank that connect gradually, the pond volume proportion of anaerobic tank, selection tank, oxygen deficiency tank, back oxygen deficiency tank and aerobic tank is: 6-9: 1: 6-9: 11-18: 11-18, the function of each tank can be exerted to the maximum extent by setting the tank capacity proportion, so that the best overall effect is achieved;
aeration devices are respectively arranged at the bottom parts in the rear anoxic pond and the aerobic pond;
stirring devices are arranged in the anaerobic tank, the selection tank, the anoxic tank and the rear anoxic tank;
the anoxic tank is connected back to the anaerobic tank through a mixed liquid return pipe provided with a control valve and a return pump;
the aerobic tank is connected back to the anoxic tank through a first return pipe provided with a return pump and a control valve;
the aerobic tank is connected back to the back anoxic tank through a second return pipe provided with a return pump and a control valve.
In the above system, the enhanced biological treatment module further comprises:
the secondary sedimentation tank is connected to the rear of the aerobic tank and is connected to the selection tank through a pipeline provided with a sludge reflux pump;
the enhanced biological treatment module further comprises:
the water inlet pipe network is provided with a main pipeline, the main pipeline is respectively connected with three water inlet branch pipes, each water inlet branch pipe is provided with a control valve, and in the three water inlet branch pipes, a first water inlet branch pipe is connected with the anaerobic tank, a second water inlet branch pipe is connected with the anoxic tank, and a third water inlet branch pipe is connected with the aerobic tank.
In the enhanced biological treatment module, an anaerobic tank degrades degradable substances in the sewage to generate volatile fatty acid VFA and release phosphate; the selective tank further degrades the residual COD, avoids the competition of heterotrophic microorganism growth and denitrifying phosphorus removal bacteria in the anoxic tank caused by the residual COD, and simultaneously can effectively prevent sludge from swelling and improve the sludge settling performance; the anoxic pond enriches and removes phosphorus by denitrification, and removes phosphorus by denitrification and denitrification of an internal carbon source; the back anoxic pond is provided with aeration and stirring, and the alternate control of anoxic and aerobic culture can be realized according to the water quality condition; the aerobic tank is precisely aerated by the arranged aeration device to oxidize ammonia nitrogen in the sewage into nitrate nitrogen.
In the above system, the depth processing module includes:
a flocculation sedimentation tank, a sand filter tank and an ultraviolet disinfection device which are connected in sequence.
The advanced treatment module is provided with a flocculation sedimentation tank and a dosing room, wherein the flocculation sedimentation tank solves the problem that the SS and TP of effluent possibly exceed standards instantly due to water quality fluctuation, and the flocculation effect is improved by adding PAM and PAC in the dosing room. And the sand filtering tank further removes SS in the sewage. And under special conditions, activated carbon is added into the dosing room by adopting a pump pit for emergency treatment. The ultraviolet disinfection device kills harmful microorganisms in the sewage through ultraviolet rays, so that the effluent reaches the standard and is discharged.
In the pretreatment module, the enhanced biological treatment module and the advanced treatment module of the system, the used pump and fan adopt an adjustable variable frequency pump and fan, valves all adopt electric valves,
the automatic control module comprises: a pretreatment control submodule, a biological control submodule and a depth control submodule;
the pretreatment control submodule is electrically connected with the pretreatment module and can realize joint control of a pretreatment module grid and a pump and liquid level in the regulating reservoir; the liquid level difference in front of and behind the grating can be effectively controlled so as to ensure the treatment effect, and meanwhile, the water level in the regulating tank is divided into three different liquid level states of high, medium and low, and the water level is correspondingly controlled to be different water inflow flows to enter the enhanced biological treatment module;
the biological control submodule is electrically connected with the enhanced biological treatment module and can realize the joint control of water quality indexes, aeration quantity and reflux ratio in each process in the enhanced biological treatment module; such as: adjusting aeration quantity and reflux ratio according to the ammonia nitrogen concentration of the effluent of the aerobic tank, and increasing the aeration quantity to improve the reflux ratio of the aerobic tank to the rear anoxic tank to improve the nitrification effect if the ammonia nitrogen concentration of the effluent is higher;
the depth control submodule is electrically connected with the depth treatment module and can realize the joint control of the water quality and the dosing quantity of the outlet water of the depth treatment module. Such as: when the effluent SS and the total phosphorus are poor, the dosage can be increased, so that the treatment effect is improved, the dosage in the flocculation sedimentation tank is effectively adjusted, the dosage of the activated carbon in the dosing room is controlled, and the medicine consumption is reduced. This automatic control module can realize the nimble operation of multiple technology according to the quality of water yield change of intaking, if: the denitrification dephosphorization process, the multi-stage A/O process, the UCT process and the like, and the process is flexible to adjust.
Referring to fig. 3 and 4, an embodiment of the present invention further provides a method for treating sewage in villages and small towns, which has high efficiency and low consumption, and the effluent reaches surface IV water, and the system described above is adopted, and the method includes the following steps:
a pretreatment step: the treated sewage of villages and towns enters a pretreatment module, suspended matters, floaters, gravels and the like in the sewage are removed through filtering and precipitation, and the effluent after pretreatment enters a reinforced biological treatment module;
and (3) strengthening biological treatment: after the sewage enters the enhanced biological treatment module, sequentially carrying out enhanced biological treatment, and enabling the treated effluent to enter the advanced treatment module;
a deep treatment step: the entering sewage is sequentially subjected to flocculation precipitation, filtration and disinfection treatment.
In the step of enhanced biological treatment in the method, the enhanced biological treatment comprises:
at least one of denitrification dephosphorization treatment, multi-stage A/O treatment and UCT treatment.
The invention provides a novel system and a method for treating sewage in villages and towns aiming at the characteristics of the sewage in the villages and the towns, which can treat the sewage in the villages and the towns by a sustainable denitrification dephosphorization technology, divide the whole system into different modules, have reasonable composition and can meet high emission standards by using minimum resources.
The embodiments of the present invention are described in further detail below.
As shown in fig. 1, an embodiment of the present invention provides a system for treating sewage in villages and towns, which is formed by sequentially connecting a pretreatment module, an enhanced biological treatment module, and a depth treatment module, and realizes unattended automatic operation by cooperatively controlling the pretreatment module, the enhanced biological treatment module, and the depth treatment module by an automatic control module.
Furthermore, the pretreatment module comprises a coarse grid and a fine grid, so that suspended matters and floating substances in the sewage can be removed, and the subsequent treatment effect is improved.
Further, can select different pretreatment module according to quality of water and operation effect in order to guarantee that the water is stable up to standard, if the quality of water volume fluctuation of intaking is great, foretell pretreatment module can increase the equalizing basin module, and the equalizing basin is equipped with the further grit of getting rid of mud fill and mud discharging device, improves the utilization ratio of follow-up biological pond appearance and reduces the processing of surplus mud and handles pressure.
The enhanced biological treatment module adopts flexible design, and consists of an anaerobic tank, a selection tank, an anoxic tank, a back anoxic tank and an aerobic tank in sequence, wherein the tank volume ratio is 6-9: 1: 6-9: 11-18: 11-18, a typical pool-type planar arrangement of enhanced biological treatment modules, see fig. 2.
Furthermore, the anaerobic tank of the enhanced biological treatment module is mainly used for biologically treating degradable COD in the inlet water to generate volatile fatty acid VFA and release phosphate, thereby creating conditions for denitrifying phosphorus removal bacteria. The selective tank further degrades the residual COD, avoids the competition of heterotrophic microorganism growth and denitrifying phosphorus removal bacteria in the anoxic tank caused by the residual COD, and simultaneously can effectively prevent sludge from swelling and improve the sludge settling performance;
furthermore, the anaerobic tank adopts a push flow reactor form to avoid the deposition of sludge, a stirring device is arranged in the selective tank, and the anoxic tank adopts a push flow reactor form;
further, denitrifying phosphorus removal bacteria in the anoxic pond utilize an internal carbon source to denitrify and remove phosphorus simultaneously. The rear anoxic tank adjusts the operation mode according to the effluent ammonia nitrogen and total nitrogen indexes, when the effluent total nitrogen exceeds the standard, the rear anoxic tank is used for further improving the denitrification effect, when the effluent ammonia nitrogen exceeds the standard, the rear anoxic tank is used as an aerobic tank, and the DO can be controlled to be 0.1-2 mg/L according to different water qualities. The aerobic tank is mainly used for oxidizing ammonia nitrogen into nitrate nitrogen, an adjustable aeration device is arranged in the aerobic tank, and DO of the aerobic tank is generally between 2 and 4 mg/L;
furthermore, the reflux ratio from the aerobic tank to the rear anoxic tank is 200-500%, and if the concentration of the ammonia nitrogen in the effluent is too high and the risk of exceeding the standard exists, the reflux ratio from the aerobic tank to the rear anoxic tank is improved;
furthermore, the reflux ratio from the aerobic tank to the anoxic tank is 50-300%, and if the nitrate nitrogen of effluent exceeds the standard risk, the reflux ratio from the aerobic tank to the anoxic tank is increased;
further, the reflux ratio from the anoxic tank to the anaerobic tank is 50% -200%, the regulation is carried out according to the ORP of the anaerobic tank, and if the ORP is too high, the reflux ratio is reduced;
further, the enhanced biological treatment module further comprises: sludge in the secondary sedimentation tank is pumped into the selection tank through a sludge reflux pump to supplement the sludge concentration of the system, and the sludge reflux ratio from the secondary sedimentation tank to the selection tank is adjusted according to the change of the sludge concentration in the aerobic tank; regulating and controlling the sludge discharge frequency of the excess sludge pump according to the indexes of the total nitrogen and the total phosphorus in the effluent, reducing the SRT of the sludge age when the phosphorus removal effect is poor, and improving the SRT of the sludge age to select a proper SRT to ensure the treatment effect when the nitrification is poor;
furthermore, because of the difference between nitrifying bacteria and phosphorus removing bacteria sludge age SRT, in order to ensure that the nitrifying activity maintains longer sludge age SRT as much as possible in the running process of a low-temperature period in winter, in order to deal with the risk that the total phosphorus of the effluent exceeds the standard, the process of a sewage treatment plant is suggested as shown in figure 3, a flocculation sedimentation tank can be matched, and the adding amount of polyaluminium chloride can be increased when the phosphorus removing effect is poor, so that the total phosphorus can be ensured to reach the standard;
furthermore, carbon source adding sites are arranged in the anaerobic tank, the anoxic tank and the aerobic tank, when the operation effect of the process is poor due to short-term low-load water inlet, if the denitrification effect is poor, the total nitrogen of effluent is overproof, partial additional carbon source can be supplemented properly, and the system performance is maintained to be stable;
furthermore, the operation mode can realize a denitrification dephosphorization process, the enhanced biological treatment module of the system can be adjusted according to the change of the quality of inlet water, and various processes can be flexibly operated according to the change of the quality of inlet water, for example, the selection tank and the anaerobic tank are combined into the anaerobic tank for use, the rear anoxic tank is divided into the aerobic tank and the anoxic tank for use, and the reflux pump from the anoxic tank to the anaerobic tank is closed, so that the multistage A/O process operation can be realized;
further, the advanced treatment module comprises a dosing room, when the short-term effluent is poor, activated carbon is added by a pump pit, and the effluent quality is ensured to reach the standard through emergency treatment;
furthermore, the effluent SS and the total phosphorus have the exceeding risk, the advanced treatment module can be used for solving the problem that the effluent SS possibly exceeds the standard instantaneously due to water quality fluctuation under the condition of ultrahigh discharge standard by adding a flocculation precipitation device, and the effluent SS can be less than 10 mg/L;
furthermore, the advanced treatment module comprises a sand filter tank and an ultraviolet disinfection device, and can further remove SS in the sewage and utilize ultraviolet rays to disinfect the sewage;
furthermore, the automatic control module adopts variable frequency and adjustable pumps and fans used in the system, and the valves adopt electric valves to realize the joint control of the pumps and the liquid level, so that the front and the back of the grating keep proper liquid level difference to ensure the treatment effect;
furthermore, joint control of a pump and a liquid level in the adjusting tank is realized, the fluctuation of the inflow water volume of sewage in villages and small towns is large, the liquid level in the adjusting tank is divided into three different types of high, medium and low, and different inflow flows are set through liquid level control, so that stable operation of the enhanced biological treatment module system is ensured. .
Furthermore, joint control of the process water quality index, the aeration quantity and the reflux ratio in the enhanced biological treatment module is realized, so that the aeration quantity and the reflux ratio are changed according to the change of the water quality index in each tank treatment process of the enhanced biological treatment module, and the effects of high efficiency and low consumption are achieved.
Furthermore, joint control of effluent quality and dosing quantity of the advanced treatment module is realized, and if the effluent SS is too high, the dosing quantity of polyaluminium chloride in the flocculation sedimentation tank is increased, so that the treatment effect is ensured;
furthermore, the modularized design can be conveniently combined in an equipment manner, equipment with different sizes is designed according to the water quantity and the water quality, and an automatic control module is arranged to realize unattended remote control;
the method for treating the sewage of the villages and the towns by the system comprises the following steps:
step 1, pretreatment: the municipal sewage is pretreated in the pretreatment module, suspended matters, floating matters, gravel and the like in the sewage are removed, and meanwhile, non-degradable organic substances such as lignin, cellulose and the like in the sewage are removed, so that the utilization rate of the subsequent biological tank volume is improved, the treatment pressure of the residual sludge is reduced, and the subsequent stable treatment effect is achieved;
step 2, strengthening biological treatment: the pretreated effluent enters an enhanced biological treatment module which consists of an anaerobic tank, a selection tank, an anoxic tank, a post-anoxic tank, an aerobic tank and a secondary sedimentation tank in sequence, and different biochemical treatments can be realized by adopting flexible design;
self-control treatment: the automatic control module is used for realizing joint control of the pump and the liquid level, joint control of process water quality indexes, aeration quantity and reflux ratio, joint control of effluent water quality and dosing quantity and the like, and the pretreatment module, the enhanced biological treatment module and the advanced treatment module are cooperatively controlled through the control.
Examples
Taking a project for treating sewage in a certain village and town by adopting the system of the invention as an example, the system comprises the following concrete steps:
the inlet water flow of the project is 1200m3And d, adopting the system of the invention to carry out combined treatment by a full-flow process, wherein the hydraulic retention time HRT of the anaerobic pool, the selection pool, the anoxic pool, the post-anoxic pool and the aerobic pool is respectively 3.5, 0.5, 4.0, 7.5 and 7.5h, and the effluent can meet the discharge standard of Jing standard A under the condition that the average temperature is 20 ℃ and no additional carbon source is added.
The quality of the inlet water of the system is shown in the following table:
compared with the prior art, the system and the method of the invention at least have the following beneficial effects:
(1) by taking a sustainable denitrification dephosphorization process as a prototype and through scientific and reasonable design and optimization, the method meets the requirements of high efficiency and low water consumption to reach surface IV water with minimum resources, and simultaneously realizes the reduction of excess sludge and energy consumption to the maximum extent;
(2) by adopting the modular design of the pretreatment module, the enhanced biological treatment module, the advanced treatment module and the automatic control module, flexible regulation and control can be performed according to the quality and quantity of inlet and outlet water, the system is very suitable for the environment application of village and town sewage with low carbon-nitrogen ratio, low concentration and large fluctuation of quality and quantity of water, and unattended automatic control is realized through the automatic control module;
(3) the operation process can be adjusted according to the inflow load, and various processes can be flexibly operated according to the change of the inflow water quality, such as a denitrification dephosphorization process, a multi-stage A/O and UCT process and the like, and the process is flexibly adjusted.
The system of the invention can be applied to a wide range of process tank types, including: tradition A2O and its deformation process, oxidation ditch process, modular equipment and the like, wherein A2The O process and the oxidation ditch process are mainly changed by re-dividing the existing tank or working section on the basis of not changing the whole tank volume, thereby realizing the denitrification dephosphorization process, reducing the dependence on carbon sources and improving the treatment effect.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A high-efficiency low-consumption village and town sewage treatment system with water reaching surface IV water is characterized by comprising:
the system comprises a pretreatment module, an enhanced biological treatment module, a deep treatment module and an automatic control module; wherein,
the pretreatment module is provided with a sewage inlet and a water outlet, and the water outlet is sequentially connected with the enhanced biological treatment module and the advanced treatment module;
the deep processing module is provided with a standard water outlet;
the automatic control module is respectively electrically connected with the pretreatment module, the enhanced biological treatment module and the advanced treatment module and can cooperatively control the pretreatment module, the enhanced biological treatment module and the advanced treatment module to carry out village and town sewage treatment.
2. The system of claim 1, wherein the pre-treatment module comprises:
the thick grating and the thin grating are connected in sequence.
3. The system of claim 2, wherein the pre-treatment module further comprises: and the adjusting tank is connected behind the fine grating.
4. The system of any one of claims 1 to 3, wherein the enhanced biological treatment module comprises:
the anaerobism pond that connects gradually, select pond, oxygen deficiency pond, back oxygen deficiency pond and good oxygen pond, the pond capacity ratio of anaerobism pond, selection pond, oxygen deficiency pond, back oxygen deficiency pond and good oxygen pond is 6 ~ 9: 1: 6-9: 11-18: 11 to 18;
aeration devices are respectively arranged at the bottom parts in the rear anoxic pond and the aerobic pond;
stirring devices are arranged in the anaerobic tank, the selection tank, the anoxic tank and the rear anoxic tank;
the anoxic tank is connected back to the anaerobic tank through a mixed liquid return pipe provided with a control valve and a return pump;
the aerobic tank is connected back to the anoxic tank through a first return pipe provided with a return pump and a control valve;
the aerobic tank is connected back to the back anoxic tank through a second return pipe provided with a return pump and a control valve.
5. The system of claim 4, wherein the enhanced biological treatment module further comprises:
the secondary sedimentation tank is connected to the rear of the aerobic tank and is connected back to the selection tank through a sludge return pipe provided with a sludge return pump and a control valve;
the enhanced biological treatment module further comprises:
the water inlet pipe network is provided with a main pipeline, the main pipeline is respectively connected with three water inlet branch pipes, each water inlet branch pipe is provided with a control valve, and in the three water inlet branch pipes, a first water inlet branch pipe is connected with the anaerobic tank, a second water inlet branch pipe is connected with the anoxic tank, and a third water inlet branch pipe is connected with the aerobic tank.
6. The system for treating sewage from villages and towns with high efficiency and low consumption of effluent reaching surface IV class water according to any one of claims 1 to 3, wherein said advanced treatment module comprises:
a flocculation sedimentation tank, a sand filter tank and an ultraviolet disinfection device which are connected in sequence.
7. The system of any of claims 1 to 3, wherein the automated control module comprises:
a pretreatment control submodule, a biological control submodule and a depth control submodule; wherein,
the pretreatment control submodule is electrically connected with the pretreatment module and can realize joint control of a pretreatment module grid and a pump and liquid level in the regulating reservoir;
the biological control submodule is electrically connected with the enhanced biological treatment module and can realize the joint control of water quality indexes, aeration quantity and reflux ratio in each process in the enhanced biological treatment module;
the depth control submodule is electrically connected with the depth treatment module and can realize the joint control of the water quality and the dosing quantity of the outlet water of the depth treatment module.
8. A method for treating sewage in villages and towns with high efficiency and low consumption, wherein the water reaches surface IV class water, which is characterized in that the system of any one of claims 1 to 7 is adopted, and the method comprises the following steps:
a pretreatment step: the treated sewage of villages and towns enters a pretreatment module, suspended matters, floaters and gravels in the sewage are removed by filtration, and the pretreated effluent enters a reinforced biological treatment module;
and (3) strengthening biological treatment: after the sewage enters the enhanced biological treatment module, sequentially carrying out enhanced biological treatment, and enabling the treated effluent to enter the advanced treatment module;
a deep treatment step: the entering sewage is sequentially subjected to flocculation precipitation, filtration and disinfection treatment.
9. The method for treating sewage from villages and small towns, which has high efficiency and low consumption of discharged water reaching surface IV class water, according to claim 8, wherein the step of enhanced biological treatment comprises:
at least one of denitrification dephosphorization treatment, multi-stage A/O treatment and UCT treatment.
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| CN202010293924.0A CN111362524A (en) | 2020-04-15 | 2020-04-15 | High-efficiency low-consumption village and town sewage treatment system and method for enabling effluent to reach IV-class water on ground surface |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115321760A (en) * | 2022-08-31 | 2022-11-11 | 北京首创生态环保集团股份有限公司 | Village and town sewage treatment system with effluent reaching surface IV-class water and control method thereof |
| CN117049709A (en) * | 2023-10-10 | 2023-11-14 | 湖南易净环保科技有限公司 | Monitoring and diagnosis integrated linkage sewage treatment system and method |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115321760A (en) * | 2022-08-31 | 2022-11-11 | 北京首创生态环保集团股份有限公司 | Village and town sewage treatment system with effluent reaching surface IV-class water and control method thereof |
| CN117049709A (en) * | 2023-10-10 | 2023-11-14 | 湖南易净环保科技有限公司 | Monitoring and diagnosis integrated linkage sewage treatment system and method |
| CN117049709B (en) * | 2023-10-10 | 2023-12-26 | 湖南易净环保科技有限公司 | Monitoring and diagnosis integrated linkage sewage treatment system and method |
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