CN111925077A - Distributed domestic sewage integrated treatment system and process - Google Patents
Distributed domestic sewage integrated treatment system and process Download PDFInfo
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- CN111925077A CN111925077A CN202010938066.0A CN202010938066A CN111925077A CN 111925077 A CN111925077 A CN 111925077A CN 202010938066 A CN202010938066 A CN 202010938066A CN 111925077 A CN111925077 A CN 111925077A
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- 238000000034 method Methods 0.000 title claims abstract description 82
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 66
- 230000001651 autotrophic effect Effects 0.000 claims abstract description 50
- 238000001179 sorption measurement Methods 0.000 claims abstract description 40
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 37
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 33
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 30
- 239000011574 phosphorus Substances 0.000 claims abstract description 30
- 238000010992 reflux Methods 0.000 claims abstract description 25
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- 239000000463 material Substances 0.000 claims description 14
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 10
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- 230000010354 integration Effects 0.000 claims description 6
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- 239000004155 Chlorine dioxide Substances 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 5
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- 235000019398 chlorine dioxide Nutrition 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 5
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- 239000003795 chemical substances by application Substances 0.000 description 11
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- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 description 3
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229920002978 Vinylon Polymers 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
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- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 241000108664 Nitrobacteria Species 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 230000001376 precipitating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
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- 239000010457 zeolite Substances 0.000 description 1
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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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
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
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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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- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention relates to a distributed domestic sewage integrated treatment system and a process, wherein the distributed domestic sewage integrated treatment system comprises a pretreatment device, a regulating device, an integrated device and a disinfection device which are sequentially connected, and the integrated device comprises an anaerobic tank, a primary aerobic tank, a primary anoxic tank, an autotrophic denitrification and denitrification tank, an adsorption and dephosphorization tank and a filtering tank which are sequentially connected. The invention has the beneficial effects that: and (4) deeply removing nitrogen and phosphorus. Compared with other similar integrated processes, the process adopts the integrated autotrophic biological nitrogen and phosphorus removal process, has higher treatment efficiency on the total nitrogen, can stably reduce the total nitrogen of effluent to 5-8 mg/L, and is far beyond the current discharge standard; the anoxic denitrification process section is placed after aerobic nitrification, is different from the traditional denitrification process that denitrification is carried out before nitrification, and then adopts a treatment mode of nitrifying liquid reflux, and has the advantages of high denitrification efficiency, low denitrification energy consumption and simple process flow.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a distributed domestic sewage integrated treatment system and process.
Background
With the rapid development of economy and the acceleration of urbanization process in China, the problem of water environment pollution is increasingly serious. The outstanding problem is that the pollution of some medium and small cities and rural areas tends to be aggravated. China has huge rural population and huge sewage discharge, wherein most of sewage is directly discharged into peripheral water without treatment, thus causing serious harm to the ecological environment.
The treatment of dispersed domestic sewage has a lot of difficulties compared with centralized treatment in cities and towns, mainly lies in the following aspects: 1. the water quantity fluctuation is large. The discharge of the dispersed domestic sewage has strong randomness, and the water quantity fluctuation is usually large in different time periods of a day and different seasons of a year. The continuous and stable amount of sewage can not be formed frequently for the continuous operation of treatment facilities, and particularly for facilities adopting a biological treatment process, a microorganism system with stable performance is difficult to form, and the quality of effluent water is difficult to ensure. 2. The quality of the inlet water is unstable. The dispersed domestic sewage has a small sewage source range, and the quality difference of the waste water generated by different water is very large. Such as grey water generated by kitchens and black water generated by toilets in rural sewage; the sewage with different water qualities, such as catering waste water, toilet sewage, car washing waste water and the like in a service area of the expressway, are usually discharged at different time intervals, and the water quantity difference is large. 3. The technical process is single and the treatment effect is poor. Simple ecological treatment processes or activated sludge methods have failed to meet increasingly stringent dispersed domestic sewage treatment requirements and environmental quality requirements. Currently, a is more frequently used2The technology of/O or multi-stage AO and the like which is mature and applied in the municipal sewage treatment field is in fact due to the unstable water quantity and water quality of dispersed domestic sewageThe effect is not ideal during the inter-treatment process. The problem that the effluent of nitrogen and phosphorus pollutants is difficult to reach the standard generally exists in the current dispersed domestic sewage treatment. The main reasons are that the water quantity and the water quality are unstable, so that a stable and effective microbial population is difficult to form, and particularly, the culture of nitrobacteria is difficult; the nitrogen and phosphorus loads of the dispersed domestic sewage inflow are high, and organic matters in the water are often not enough to support biological nitrogen and phosphorus removal; the method of using additional agents such as carbon source and phosphorus removing agent cannot realize accurate regulation due to large water quality fluctuation. 4. Maintenance management is difficult. Due to the adoption of a distributed treatment mode, the sewage treatment process is difficult to maintain in a unified and centralized manner. Decentralized wastewater treatment systems also often lack capital and routine maintenance by professionals, and therefore decentralized wastewater treatment systems tend to have a short service life. In the existing treatment process, in order to achieve a better nitrogen and phosphorus removal effect, a carbon source or a phosphorus removal agent needs to be added, but due to the lack of frequent maintenance capability, accurate addition of agent metering is difficult to realize, so that maintenance of consumed agents such as the carbon source and the phosphorus removal agent is more difficult to implement. The dilemma of maintenance and management also further causes the instability of the treatment effect of the dispersed domestic sewage at present.
In view of this, this patent is filed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a distributed domestic sewage integrated treatment system and process, which can simplify the treatment process and reduce the maintenance work; strengthening nitrogen and phosphorus pollutant treatment; the water quality regulation in the process is strengthened, and the better sewage treatment effect is ensured.
The invention aims to provide a distributed domestic sewage integrated treatment system.
The invention also aims to provide the integrated treatment process of the distributed domestic sewage.
According to the distributed domestic sewage integrated treatment system provided by the embodiment of the invention, the distributed domestic sewage integrated treatment system comprises a pretreatment device, a regulation device, an integrated device and a disinfection device which are sequentially connected, wherein the integrated device comprises an anaerobic tank, a primary aerobic tank, a primary anoxic tank, a secondary aerobic tank, an autotrophic denitrification and denitrification tank, an adsorption and dephosphorization tank and a filtering tank which are sequentially connected.
According to the distributed domestic sewage integrated treatment system of the specific embodiment of the invention, the integrated equipment further comprises a homogenized water reflux device and a sludge reflux device, one end of the homogenized water reflux device is communicated with the autotrophic denitrification and denitrification tank, and the other end of the homogenized water reflux device is communicated with the anaerobic tank; one end of the sludge backflow equipment is communicated with the filtering tank, and the other end of the sludge backflow equipment is communicated with the anaerobic tank; preferably, the homogeneous water reflux device is a reflux pump, and the sludge reflux device is a sludge pump.
According to the embodiment of the invention, the distributed domestic sewage integrated treatment system is characterized in that the pretreatment equipment is a septic tank, an oil separation tank and/or a grating well. Septic tanks, oil separation tanks and/or grid wells can be selected according to actual conditions.
According to the distributed domestic sewage integrated treatment system, a biological phosphorus release area and a centralized sludge discharge area are arranged inside the anaerobic tank, and a first stirrer is arranged in the anaerobic tank.
According to the distributed domestic sewage integrated treatment system of the specific embodiment of the invention, the integrated equipment further comprises a secondary aerobic tank, domestic sewage passes through the secondary aerobic tank after being treated by the primary anoxic tank, flows into the autotrophic denitrification tank after being treated by the secondary aerobic tank, and aeration equipment is arranged in both the primary aerobic tank and the secondary aerobic tank.
According to the distributed domestic sewage integrated treatment system of the embodiment of the invention, biological contact oxidation systems constructed by suspended bed biofilm carriers (MBBR) are arranged in the primary aerobic tank and the secondary aerobic tank, and an aeration system for providing oxygen is arranged in the primary aerobic tank and the secondary aerobic tank.
According to the distributed domestic sewage integrated treatment system of the embodiment of the invention, the first-stage anoxic pond is internally provided with soft or semi-soft filler and a second stirrer. The biological film is constructed by soft or semi-soft filler, so that the microbial concentration is improved, and the sludge loss is reduced.
Preferably, the soft filler is formed by PE ropes and hydroformylation vinylon filament bouquets; the semi-soft filler is formed by PE ropes and PE ring pieces.
The first stirrer, the second stirrer and the third stirrer can use vertical stirrers when the treatment scale is smaller; at larger process scales, the impeller may be used with the agitator.
The stirrer functions as follows:
1. mixing the return water and the return sludge with the inlet water uniformly;
2. preventing sludge from precipitating.
According to the distributed domestic sewage integrated treatment system, the secondary aerobic tank and the primary aerobic tank are the same in structure.
According to the distributed domestic sewage integrated treatment system of the embodiment of the invention, the autotrophic denitrification tank is internally provided with an integrated autotrophic biological filler as a microorganism carrier and a third stirrer. The provision of a third stirrer also prevents settling. The integrated autotrophic biological filler is a material which is developed by an inventor and others for years and used for removing nitrate in water, and particularly refer to patent 201610204784.9.
Preferably, the integrated autotrophic biological filler is filled in the frame or the hollow ball to form a fixed bed which is arranged in the autotrophic denitrification nitrogen removal tank. The autotrophic biological filler has larger specific gravity, and can sink when being directly placed in water, and the filler can be dispersedly arranged in the water by using the filling mode, so that the filler is fully contacted with pollutants in the water, and the reaction rate is improved.
More preferably, the frame is a cylinder with a diameter of 2cm and a height of 1 cm.
According to the distributed domestic sewage integrated treatment system provided by the embodiment of the invention, iron-based synthetic adsorption filler is arranged in the adsorption dephosphorization tank. In the adsorption dephosphorization tank, iron-based synthetic adsorption filler is used as a dephosphorization material, and the adsorption dephosphorization tank is operated in a filter tank mode. The iron-based synthetic adsorption filler is an inorganic material with porous diameter and large specific surface area, which is prepared by combining iron-containing substances (including simple substance iron, pyrite, siderite and the like) with a skeleton mineral material (such as activated carbon, fly ash, zeolite and the like) pore-forming agent and an adhesive, pretreating with hydrochloric acid and bonding under the high-temperature oxygen-free condition, and removing phosphorus through adsorption. Has the advantages of no need of additional phosphorus removal agent, convenient maintenance and high phosphorus removal efficiency. The iron-based synthetic adsorption filler simultaneously loads microorganisms in the sewage, and the regeneration of the adsorbent is realized by utilizing the assimilation of the microorganisms.
According to the distributed domestic sewage integrated treatment system, the filter tank is internally provided with a filter material, and the filter material is a flat ceramic membrane or quartz sand. The flat ceramic membrane or quartz sand is used as a filtering material to filter sludge and suspended matters in water. The ceramic membrane has the advantages of small occupied space, good regeneration performance, simple separation process, low energy consumption, simple and convenient operation and maintenance, long service life and the like. The quartz sand has the advantages of low price, easy obtaining, good operation effect, strong water quality adaptability, simple and convenient maintenance and the like. The two materials are mainly used for removing Suspended Substances (SS) in water, so that the effluent is kept clear.
Preferably, a sludge collecting groove for collecting excess sludge is further arranged in the filtering tank.
According to the embodiment of the invention, the distributed domestic sewage integrated treatment system comprises a disinfection tank, wherein a disinfection device and a flow guide plate are arranged in the disinfection tank. The disinfection device generally uses an external administration device to add disinfectant substances such as sodium hypochlorite, chlorine tablets or chlorine dioxide. Only the end portion of the disinfection dosing apparatus is provided in the treatment device. The guide plate is used for fully mixing the disinfectant with the sewage in the pool and is not connected with the disinfection device. Generally, 2-4 plates are arranged above and below or on the left and right of the disinfection tank, so that water can turn back up and down or on the left and right, and the flow of the water is increased.
The distributed domestic sewage integrated treatment process is different from other traditional domestic sewage treatment processes because of innovation on a denitrification mechanism. The core biochemical treatment process of the traditional domestic sewage treatment process adopts an anaerobic-anoxic-aerobic process flow sequence, and meanwhile, water treated by an aerobic process section must flow back to an anoxic tank to remove organic matters, ammonia nitrogen, nitrate nitrogen and other pollutants in the water. The main ammonia nitrogen pollutants in the raw water of the domestic sewage need to complete nitrification in a subsequent 'aerobic' process section and be converted into nitrate nitrogen; then along with the reflux, the organic matters in the inlet water are utilized to carry out denitrification in the anoxic process, and the organic matters are converted into nitrogen to be removed. The anoxic tank is arranged in front of the aerobic tank, so that organic matters in the raw water can be utilized in the denitrification process. If the total phosphorus in the water is removed, a mud-water separation system is required to be arranged subsequently, and the separated sludge is returned to the anaerobic tank; or continuously adding a phosphorus removing agent in the subsequent process.
The core biochemical treatment process of the distributed domestic sewage integrated treatment process adopts an anaerobic-aerobic-anoxic process flow sequence. The treatment process can remove organic matters, ammonia nitrogen, nitrate nitrogen and other pollutants in water without refluxing. The invention adopts autotrophic denitrification technology, so that organic matters are not needed to participate in the denitrification process. Therefore, after the ammonia nitrogen pollutants are subjected to aerobic nitrification, denitrification can be directly performed, and the anoxic tank is not required to be arranged in front of the aerobic tank, so that the flow of nitrifying liquid reflux is also omitted. The treatment process flow is simpler and more direct. Meanwhile, the invention uses an adsorption dephosphorization process, and dephosphorization is not needed by a sludge reflux or continuous addition of a dephosphorization agent. The operation and maintenance are simpler, and the application characteristics of treating the dispersed domestic sewage are better met.
According to the distributed domestic sewage integrated treatment process of the embodiment of the invention, sewage sequentially enters a pretreatment device, a regulating device, an anaerobic tank, a primary aerobic tank, a primary anoxic tank, an autotrophic denitrification and denitrification tank, an adsorption dephosphorization tank, a filtering tank and a disinfection device and then is discharged.
Or the sewage sequentially enters a pretreatment device, a regulating device, an anaerobic tank, a primary aerobic tank, a primary anoxic tank, a secondary aerobic tank, an autotrophic denitrification and denitrification tank, an adsorption dephosphorization tank, a filter tank and a disinfection device, and then is discharged.
Preferably, the treatment system runs a homogeneous water reflux flow process when water is discontinuously fed, and water in the autotrophic denitrification nitrogen removal tank returns to the anaerobic tank through a reflux pump; the sludge precipitated in the filter tank flows back to the anaerobic tank through a sludge pump.
According to the distributed domestic sewage integrated treatment process of the embodiment of the invention, preferably, before the sewage flows into the disinfection equipment, chlorine tablets, sodium hypochlorite or field chlorine dioxide preparation is added into the disinfection equipment, so that the sewage flowing into the disinfection equipment is contacted with the chlorine dioxide for disinfection.
According to the distributed domestic sewage integrated treatment process of the embodiment of the invention, the treatment time in the anaerobic tank is preferably 1-3 hours.
According to the distributed domestic sewage integrated treatment process of the embodiment of the invention, preferably, the treatment time in the primary aerobic tank is 4-8 hours.
According to the distributed domestic sewage integrated treatment process of the embodiment of the invention, preferably, the treatment time in the primary anoxic tank is 2-5 hours.
According to the distributed domestic sewage integrated treatment process of the embodiment of the invention, preferably, the treatment time in the secondary aerobic tank is 2-6 hours.
According to the distributed domestic sewage integrated treatment process of the embodiment of the invention, preferably, the treatment time in the autotrophic denitrification and denitrification tank is 2-5 hours.
According to the distributed domestic sewage integrated treatment process of the embodiment of the invention, preferably, the treatment time in the adsorption dephosphorization tank is 0.5-3 hours.
The effluent of the autotrophic denitrification denitrogenation tank flows back when the device is in a state of suspending water inflow without continuous water inflow, and is used for keeping the water body in the device flowing and material exchange.
The sludge after mud-water separation flows back to the filter tank, so that the sufficient sludge concentration and sludge retention time in the equipment are ensured.
The traditional domestic sewage treatment process does not meet the stability maintenance of a treatment system under the condition of discontinuous water inlet or water cut-off. Aiming at the situation, the homogeneous water reflux is arranged between the autotrophic denitrification nitrogen removal tank and the anaerobic tank, and part of water treated by the autotrophic denitrification nitrogen removal tank is sent back to the anaerobic tank. Homogeneous water backflow can keep continuous flow of water in the equipment under the condition that the equipment cannot continuously run when the water inflow is insufficient or the water is cut off, and then normal exchange of substances among all treatment units is guaranteed. The device performance is ensured not to be irreversibly damaged due to water cut-off. When the equipment normally and continuously operates, the backflow of the homogeneous water is stopped, and the effluent enters the adsorption dephosphorization tank.
And a sludge part obtained after mud-water separation in the filter tank is sent back to the anaerobic tank through a sludge backflow mechanism between the filter tank and the anaerobic tank, and is used for maintaining the sludge concentration and the sludge retention time in the equipment.
Compared with the prior art, the invention has the following beneficial effects:
(1) the process combination is strong, and the process combination can be adjusted according to different actual inflow water quality, and the sewage treatment with different application scenes is used. For the inlet water with relatively low COD and nitrogen pollution load, the two-stage aerobic-anoxic process can be simplified into one-stage aerobic-anoxic process, and the pollutants can be effectively removed.
(2) And (4) deeply removing nitrogen and phosphorus. Compared with other similar integrated processes, the process provided by the invention adopts the integrated autotrophic nitrogen and phosphorus removal process, has higher treatment efficiency on total nitrogen, can stably reduce the total nitrogen of effluent to 5-8 mg/L, and is far beyond the current discharge standard.
(3) The anoxic denitrification process section is placed after aerobic nitrification, is different from the traditional denitrification process that denitrification is carried out before nitrification, and then adopts a treatment mode of nitrifying liquid reflux, and has the advantages of high denitrification efficiency, low denitrification energy consumption and simple process flow.
(4) The process of the invention creatively sets the homogeneous water reflux, overcomes the defect that the traditional dispersed domestic sewage treatment process can not deal with discontinuous water inlet treatment, and solves the problem of maintaining the process treatment capacity when continuous water inlet is not available.
(5) The dephosphorization process combines adsorption dephosphorization and microbial dephosphorization, and enriches the phosphorus in the water on the adsorbent by utilizing the adsorption effect of the adsorbent; then, the assimilation of the microorganism is utilized to enrich the phosphorus in the microorganism body, so that the regeneration of the adsorbent is realized.
(6) According to the process, no medicament is required to be added in the nitrogen and phosphorus removal process, the related medicament feeding device and cost can be saved, the service life of materials is long, the management and maintenance are simple, and the number of fault points is small.
(7) The structure is simple, the sludge amount is small, and the maintenance is simple. The integration technology integration level is high, and simultaneously, the structure design is ingenious and concise. The integrated autotroph denitrification technology and the iron-based synthetic adsorption dephosphorization technology enable the sludge yield of the system to be far lower than that of like products, and greatly reduce the maintenance frequency and cost. More accords with the application characteristics of treating and dispersing domestic sewage.
Drawings
FIG. 1 shows a flow chart of a distributed domestic sewage integrated treatment process according to embodiment 1 of the present invention;
fig. 2 shows a flow chart of a distributed domestic sewage integrated treatment process according to embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a distributed domestic sewage integrated treatment system, which includes a pretreatment device, a regulation device, an integrated device and a disinfection device that are connected in sequence, wherein the integrated device includes an anaerobic tank, a primary aerobic tank, a primary anoxic tank, an autotrophic denitrification tank, an adsorption dephosphorization tank and a filtration tank that are connected in sequence; the pretreatment equipment is a grid well; a biological phosphorus release area and a centralized sludge discharge area are arranged in the anaerobic tank, and a first stirrer is arranged in the anaerobic tank; a biological contact oxidation system constructed by suspended bed biofilm fillers (MBBR) and an aeration system for providing oxygen are arranged in the primary aerobic tank; a soft filler and a second stirrer are arranged in the first-stage anoxic tank; the soft filler is formed by PE ropes and hydroformylation vinylon filament bouquets; the first stirrer, the second stirrer and the third stirrer can use vertical stirrers when the treatment scale is smaller; when the treatment scale is larger, the stirrer can use a flow impeller; an integrated autotrophic biological filler and a third stirrer which are used as microorganism carriers are arranged in the autotrophic denitrification nitrogen removal tank; the integrated autotrophic biological filler is filled in a fixed bed formed by a frame and is arranged in the autotrophic denitrification nitrogen removal tank; the frame is a hollow ball with the diameter of 2 cm; the adsorption dephosphorization pool is provided with iron-based synthetic adsorption filler, and the iron-based synthetic adsorption filler is used as a dephosphorization material in the adsorption dephosphorization pool and is operated in a filter tank mode. The iron-based synthetic adsorption filler is an inorganic material which is synthesized based on iron-containing substances and has porous diameter and large specific surface area, and phosphorus is removed through adsorption. Has the advantages of no need of additional phosphorus removal agent, convenient maintenance and high phosphorus removal efficiency; and a quartz sand filter is adopted in the filter tank for filtering. Chlorine tablets are put into the disinfection equipment.
Example 2
As shown in fig. 2, the present embodiment provides a distributed domestic sewage integrated treatment system, which includes a pretreatment device, a regulation device, an integrated device and a disinfection device that are connected in sequence, wherein the integrated device includes an anaerobic tank, a primary aerobic tank, a primary anoxic tank, a secondary aerobic tank, an autotrophic denitrification tank, an adsorption dephosphorization tank and a filtration tank that are connected in sequence; the pretreatment equipment is an oil separation tank; a biological phosphorus release area and a centralized sludge discharge area are arranged in the anaerobic tank, and a first stirrer is arranged in the anaerobic tank; the structure of the secondary aerobic tank is the same as that of the primary aerobic tank; biological contact oxidation systems constructed by suspended bed biofilm fillers (MBBR) are arranged in the primary aerobic tank and the secondary aerobic tank, and aeration systems for providing oxygen are arranged in the primary aerobic tank and the secondary aerobic tank; a semi-soft filler and a second stirrer are arranged in the first-stage anoxic tank; the semi-soft filler is formed by PE ropes and PE ring pieces. The first stirrer, the second stirrer and the third stirrer can use vertical stirrers when the treatment scale is smaller; when the treatment scale is larger, the stirrer can use a flow impeller; an integrated autotrophic biological filler and a third stirrer which are used as microorganism carriers are arranged in the autotrophic denitrification nitrogen removal tank; the integral autotrophic biological filler is filled in the cylinder to form a fixed bed which is arranged in the autotrophic denitrification nitrogen removal tank, the autotrophic biological filler has larger specific gravity and can sink when being directly placed in water, the filler can be dispersedly arranged in the water by using the filling mode and fully contacted with pollutants in the water, the reaction rate is improved, and the iron-based synthetic adsorption filler is arranged in the adsorption phosphorus removal tank; in the adsorption dephosphorization pool, iron-based synthetic adsorption filler is used as a dephosphorization material, and the adsorption dephosphorization pool is operated in a filter pool mode; the filter tank is internally provided with a filter material which is a flat ceramic membrane, and the filter tank is also internally provided with a sludge collecting groove for collecting the excess sludge.
Specifically, the disinfection equipment is a disinfection tank, and a disinfection device and a guide plate are arranged in the disinfection tank. The disinfection device uses a peripheral chemical dosing device, disinfection is carried out by adding sodium hypochlorite, only the end part of the disinfection chemical dosing device is arranged in the treatment equipment, and after sodium hypochlorite solution is diluted by adding water, the sodium hypochlorite solution is directly added into the disinfection device by a corrosion-resistant pump.
The volume of the anaerobic pool is 0.19, and the designed hydraulic retention time is 1-3 h; the volume of the primary aerobic tank is 0.57, and the hydraulic retention time is designed to be 4-8 h; the volume of the first-stage anoxic pond is 0.38, and the hydraulic retention time is designed to be 2-5 h; the volume of the secondary aerobic tank is 0.38, and the hydraulic retention time is designed to be 2-6 h; the volume of the autotrophic denitrification nitrogen removal tank is 0.29, and the hydraulic retention time is designed to be 2-5 h; the volume of the adsorption dephosphorization pool is 0.19, and the hydraulic retention time is designed to be 0.5-3 h; the integrated autotrophic biological filler is a cylinder with a diameter of about 2cm and a height of about 1 cm.
Test example 1
The device of the embodiment 2 is adopted to carry out the integrated treatment process of the distributed domestic sewage, the sewage sequentially enters a pretreatment device, a regulating device, an anaerobic tank, a primary aerobic tank, a primary anoxic tank, a secondary aerobic tank, an autotrophic denitrification tank, an adsorption dephosphorization tank, a filtering tank and a disinfection device, and then is discharged;
the volume of the anaerobic pool is 0.19, and the hydraulic retention time is designed to be 2 h; the volume of the primary aerobic tank is 0.57, and the hydraulic retention time is designed to be 6 h; the volume of the first-stage anoxic pond is 0.38, and the hydraulic retention time is designed to be 3 h; the volume of the secondary aerobic tank is 0.38, and the hydraulic retention time is designed to be 4 hours; the volume of the autotrophic denitrification nitrogen removal tank is 0.29, and the hydraulic retention time is designed to be 3 h; the volume of the adsorption dephosphorization pool is 0.19, and the hydraulic retention time is designed to be 2 h; the integrated autotrophic biological filler is a cylinder with a diameter of about 2cm and a height of about 1 cm.
The effluent of the autotrophic nitrogen removal tank flows back when the device does not continuously feed water and is in a water feeding pause state, and the effluent is used for keeping the water body in the device flowing and exchanging substances; the sludge after mud-water separation flows back to the filter tank, so that the sufficient sludge concentration and sludge retention time in the equipment are ensured.
Homogeneous water reflux is arranged between the autotrophic denitrification nitrogen removal tank and the anaerobic tank, and part of water treated by the autotrophic denitrification nitrogen removal tank is returned to the anaerobic tank. Homogeneous water backflow can keep continuous flow of water in the equipment under the condition that the equipment cannot continuously run when the water inflow is insufficient or the water is cut off, and then normal exchange of substances among all treatment units is guaranteed. The device performance is ensured not to be irreversibly damaged due to water cut-off. When the equipment normally and continuously operates, the backflow of the homogeneous water is stopped, and the effluent enters the adsorption dephosphorization tank.
And a sludge part obtained after mud-water separation in the filter tank is sent back to the anaerobic tank through a sludge backflow mechanism between the filter tank and the anaerobic tank, and is used for maintaining the sludge concentration and the sludge retention time in the equipment.
During operation, the ammonia nitrogen concentration of inlet water is about 77mg/L, the COD concentration is about 450mg/L, and the nitrate nitrogen concentration is about 4.71 mg/L; the ammonia nitrogen concentration of the effluent is about 34mg/L, the COD concentration is about 62mg/L, and the nitrate nitrogen concentration is about 1.89 mg/L. From the above results, the ammonia nitrogen removal rate was 55.8%, the COD removal rate was 86.2%, and the nitrate nitrogen removal rate was 60.0%.
Test example 2
The process of the experimental example is completely the same as that of the example 1, and during the operation period, the influent ammonia nitrogen concentration is about 94.3mg/L, the COD concentration is about 685mg/L, the nitrate nitrogen concentration is about 5.47mg/L, the effluent ammonia nitrogen concentration is about 27.3mg/L, the COD concentration is about 50mg/L, and the nitrate nitrogen concentration is about 1.8 mg/L. From the above results, the ammonia nitrogen removal rate was 71.1%, the COD removal rate was 92.7%, and the nitrate nitrogen removal rate was 67.1%.
Test example 3
The process of the experimental example is completely the same as that of the example 1, and during the operation period, the concentration of the ammonia nitrogen of the inlet water is about 59.1mg/L, the concentration of the COD is about 457.5mg/L, the concentration of the nitrate nitrogen is about 6.3mg/L, the concentration of the ammonia nitrogen of the outlet water is about 11.7mg/L, the concentration of the COD is about 30.5mg/L, and the concentration of the nitrate nitrogen is about 2.35 mg/L. From the above results, it was found that the ammonia nitrogen removal rate was 80.2%, the COD removal rate was 93.3%, and the nitrate nitrogen removal rate was 62.7%.
The experimental examples show that the process adopts the integrated autotrophic biological nitrogen and phosphorus removal process, has higher treatment efficiency on the total nitrogen, can stably reduce the total nitrogen of effluent to 5-8 mg/L, and is far beyond the current discharge standard.
The anoxic denitrification process section is placed after aerobic nitrification, is different from the traditional denitrification process that denitrification is carried out before nitrification, and then adopts a treatment mode of nitrifying liquid reflux, and has the advantages of high denitrification efficiency, low denitrification energy consumption and simple process flow.
The process of the invention creatively sets the homogeneous water reflux, overcomes the defect that the traditional dispersed domestic sewage treatment process can not deal with discontinuous water inlet treatment, and solves the problem of maintaining the process treatment capacity when continuous water inlet is not available.
The integrated autotroph denitrification technology and the iron-based synthetic adsorption dephosphorization technology enable the sludge yield of the system to be far lower than that of like products, and greatly reduce the maintenance frequency and cost.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The utility model provides a distributed domestic sewage integration processing system, its characterized in that, distributed domestic sewage integration processing system is including the preliminary treatment equipment, adjusting device, integration equipment and the disinfecting equipment that connect gradually, integration equipment is including the anaerobism pond, the good oxygen pond of one-level, one-level oxygen deficiency pond, autotrophic denitrification denitrogenation pond, absorption dephosphorization pond and the filtering ponds that connect gradually.
2. The decentralized integrated domestic sewage treatment system according to claim 1, wherein said integrated apparatus further comprises a homogenized water return apparatus and a sludge return apparatus, one end of said homogenized water return apparatus is in communication with said autotrophic denitrification tank, and the other end of said homogenized water return apparatus is in communication with said anaerobic tank; one end of the sludge backflow equipment is communicated with the filtering tank, and the other end of the sludge backflow equipment is communicated with the anaerobic tank; preferably, the homogeneous water reflux device is a reflux pump, and the sludge reflux device is a sludge pump.
3. The decentralized domestic sewage integrated treatment system according to claim 1, wherein a biological phosphorus release area and a centralized sludge discharge area are arranged inside the anaerobic tank, and a first stirrer is arranged in the anaerobic tank.
4. The decentralized integrated domestic sewage treatment system according to claim 1, wherein said integrated apparatus further comprises a secondary aerobic tank, wherein domestic sewage treated by said primary anoxic tank passes through said secondary aerobic tank, and then flows into said autotrophic denitrification tank after being treated by said secondary aerobic tank, and aeration devices are disposed in both said primary aerobic tank and said secondary aerobic tank.
5. The decentralized integrated domestic sewage treatment system according to claim 1, wherein a second agitator and a soft or semi-soft filler are provided in said primary anoxic tank.
6. The decentralized integrated domestic sewage treatment system according to claim 1, wherein said autotrophic denitrification tank contains an integrated autotrophic biological filler and a third stirrer as microorganism carriers, and said integrated autotrophic biological filler is filled in a frame or hollow ball to form a fixed bed and is located in said autotrophic denitrification tank.
7. The distributed domestic sewage integrated treatment system according to claim 1, wherein iron-based synthetic adsorption packing is disposed in the adsorption phosphorus removal tank.
8. The integrated distributed domestic sewage treatment system according to claim 1, wherein a filtering material is arranged in the filtering tank, and the filtering material is a flat ceramic membrane or quartz sand; preferably, a sludge collecting groove for collecting excess sludge is further arranged in the filtering tank; the pretreatment equipment is a septic tank, an oil separation tank and/or a grating well.
9. The decentralized integrated domestic sewage treatment system according to claim 1, wherein said disinfection apparatus comprises a disinfection tank, wherein a disinfection device and a baffle are provided in said disinfection tank.
10. The treatment process of the distributed domestic sewage integrated treatment system according to any one of claims 1 to 9, wherein the sewage is sequentially introduced into a pretreatment device, a conditioning device, an anaerobic tank, a primary aerobic tank, a primary anoxic tank, an autotrophic denitrification tank, an adsorption dephosphorization tank, a filtration tank and a disinfection device, and then discharged; or the sewage sequentially enters a pretreatment device, a regulating device, an anaerobic tank, a primary aerobic tank, a primary anoxic tank, a secondary aerobic tank, an autotrophic denitrification and denitrification tank, an adsorption and dephosphorization tank, a filter tank and a disinfection device and then is discharged; preferably, the treatment system runs a homogeneous water reflux flow process when water is discontinuously fed, and water in the autotrophic denitrification nitrogen removal tank returns to the anaerobic tank through a reflux pump; the sludge precipitated in the filter tank flows back to the anaerobic tank through a sludge pump; preferably, before the sewage flows into the disinfection equipment, chlorine tablets or sodium hypochlorite is added into the disinfection equipment or chlorine dioxide is prepared on site, so that the sewage flowing into the disinfection equipment is contacted with the chlorine dioxide for disinfection.
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