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CN109133496B - Efficient dephosphorization and denitrification treatment process for domestic sewage - Google Patents

Efficient dephosphorization and denitrification treatment process for domestic sewage Download PDF

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CN109133496B
CN109133496B CN201810861428.3A CN201810861428A CN109133496B CN 109133496 B CN109133496 B CN 109133496B CN 201810861428 A CN201810861428 A CN 201810861428A CN 109133496 B CN109133496 B CN 109133496B
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denitrification
tank
concentration
layer
zeolite
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CN109133496A (en
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夏兵
郁莉萍
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Jiangsu Kangyuan Environmental Protection Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/34Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections

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  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention provides a domestic sewage dephosphorization and denitrification high-efficiency treatment process, wherein raw sewage sequentially passes through an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, wherein part of sludge in the sedimentation tank and part of raw sewage added with a denitrifying bacteria agent pass through a denitrification bed and then flow back to the anaerobic tank, and part of mixed liquor flowing out of the aerobic tank passes through the denitrification bed and then flows back to the anoxic tank after the denitrifying bacteria agent is added; a first zeolite layer, a metal sponge denitrification layer and a second zeolite layer are sequentially arranged in the denitrification bed from top to bottom. The invention effectively solves the problem of poor denitrification and dephosphorization effects of the traditional A2/O process, does not obviously increase the hydraulic retention time of a process system, and does not produce secondary pollution.

Description

Efficient dephosphorization and denitrification treatment process for domestic sewage
Technical Field
The invention relates to a sewage treatment process, in particular to a domestic sewage dephosphorization and denitrification high-efficiency treatment process.
Background
Domestic sewage is wastewater discharged in daily life of residents and mainly comes from residential buildings and public buildings, such as houses, institutions, schools, hospitals, shops, public places, industrial enterprise toilets and the like. One of the hazards brought by domestic sewage is eutrophication pollution, namely water quality pollution caused by excessive content of plant nutrient substances such as nitrogen, phosphorus and the like.
In the existing traditional sewage treatment plant, the A2/O process is a commonly adopted conventional process, an anoxic tank is added in the anaerobic-aerobic dephosphorization process, and part of mixed liquor flowing out of the aerobic tank flows back to the front end of the anoxic tank so as to achieve the aim of nitrification and denitrification. The synchronous dephosphorization and denitrification mechanism of the A2/O process consists of two parts: firstly, phosphorus in the sewage is removed, phosphorus-accumulating bacteria are released in an anaerobic state (DO is less than 0.3mg/L), more phosphorus-accumulating bacteria are absorbed in an aerobic state, and the phosphorus is discharged out of the system in the form of excess sludge; and secondly, denitrification is carried out, DO (dissolved oxygen) is controlled to be less than 0.5mg/L in an anoxic section, and due to the action of facultative denitrifying bacteria, BOD (biochemical oxygen demand) in water is used as a hydrogen donor (organic carbon source) to reduce nitrate and nitrite in the mixed liquid from the aerobic tank into nitrogen which escapes into the atmosphere, so that the aim of denitrification is fulfilled. In the process for removing the organic matters by deoxidation and dephosphorization at the same time, the process flow is the simplest, and the total hydraulic retention time is less than that of other similar processes. However, the denitrification effect in the traditional A2/O process is influenced by the reflux ratio of the mixed liquor, the returned sludge brings part of nitrate into the anaerobic zone, the existence of the nitrate seriously influences the phosphorus-accumulating efficiency of phosphorus-accumulating bacteria, and the dephosphorization effect is greatly influenced, so that the denitrification and dephosphorization efficiency of the traditional A2/O process is not high.
Therefore, how to improve the denitrification and dephosphorization effect based on the established A2/O traditional sewage treatment process becomes an urgent problem to be solved. In the prior art, the nitrogen and phosphorus removal effect of the A2/O process is generally improved by adding a chemical nitrogen and phosphorus removal agent, however, the addition of the chemical agent causes secondary pollution, so that the sewage treatment effect is affected.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a domestic sewage dephosphorization and denitrification high-efficiency treatment process, and solves the problem of poor denitrification and dephosphorization effects of the traditional A2/O process.
The technical scheme adopted by the invention for solving the technical problems is as follows: a domestic sewage dephosphorization and denitrification high-efficiency treatment process is characterized in that raw sewage sequentially passes through an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, wherein part of sludge in the sedimentation tank and part of raw sewage added with denitrifying bacteria agent pass through a denitrification bed together and then flow back to the anaerobic tank, and part of mixed liquor flowing out of the aerobic tank passes through the denitrification bed after being added with the denitrifying bacteria agent and then flows back to the anoxic tank;
wherein, a first zeolite layer, a metal sponge denitrification layer and a second zeolite layer are sequentially arranged in the denitrification bed from top to bottom; the preparation method of the metal sponge denitrified layer comprises the following steps:
s1 TiOSO4Dissolved in H at a concentration of 2mol/L2SO4In the solution, mixed solution with titanium ion concentration of 0.015mol/L is obtained, and KNO is added3Adjusting the pH of the solution to 4-5 by using nitric acid and strong ammonia water until the concentration of the solution is 0.02mol/L, and then adding H2O2Until the concentration is 0.015mol/L, obtaining a first mixed solution;
s2 adding octadecyltrimethoxysilane into anhydrous ethanol to form a mixed solution with the concentration of 80mL/L, and adding sodium stearate into the mixed solution to the concentration of 5g/L to obtain a second mixed solution;
s3, mixing the first mixed solution and the second mixed solution according to the volume ratio of 1:2 to form an electrodeposition solution;
s4 ultrasonic stirring with copper foam as cathode and stainless steel as anode at 180mA/cm2At a current density of 1.5 hours, obtaining a surface electrodeposited TiO2Nanocrystalline copper foam;
s5, sequentially adding nitric acid with the mass percentage concentration of 10% and sodium acetate with the mass percentage concentration of 40% into deionized water to form cleaning liquid; soaking the copper foam treated in the step S4 into the cleaning solution for 10 minutes at a constant temperature of 45 ℃;
s6, placing the foam copper cleaned in the step S5 into an electric furnace under the atmosphere of 1MPa nitrogen, and sintering at 800 ℃ for 20 minutes; and then cooling the furnace to room temperature to obtain the foamy copper with the surface sintered with the dendritic nano titanium dioxide crystal, namely the sponge denitrified layer.
The invention has the following positive effects: the invention improves the traditional A2/O process, adds the design of a denitrification bed, and combines the input of a denitrifying bacteria agent, so that the return sludge and a part of the raw sewage with the denitrifying bacteria agent sequentially pass through the filtration and uniform distribution of a first zeolite layer, the denitrification and oxygen removal of a denitrification layer and the buffer adsorption treatment of a second zeolite layer, and then the nitrate nitrogen and the nitric acid oxygen in the return sludge are removed before the return sludge enters an anaerobic tank, wherein the function of the part of the raw sewage is favorable for the dilution and uniform distribution of the return sludge on one hand, and a certain carbon source is provided for denitrification on the other hand, and the denitrification rate is improved by combining a special sponge denitrification layer design in an endogenous metabolism mode. According to the invention, a three-dimensional structure is formed inside the specially prepared sponge denitrification layer, and the dendritic nano crystals effectively increase the position of the internal space of the sponge, so that extremely favorable conditions can be provided for denitrification treatment, the key of increasing denitrification rate is realized, the sponge layer is not compressed to form blockage or influence flow velocity due to factors such as excessive filtration pressure, and the like, and finally, the total hydraulic retention time is not obviously prolonged while the denitrification and dephosphorization efficiency is effectively improved in the whole process. In addition, certain denitrifying bacteria agent is added into the backflow mixed liquid and then flows through the denitrification bed, the denitrification treatment can be carried out to the maximum extent before the backflow mixed liquid flows back to the anoxic tank, and the denitrification effect of the whole process cannot be significantly influenced when the backflow of the mixed liquid is large. The invention effectively solves the problem of poor denitrification and dephosphorization effects of the traditional A2/O process, does not obviously increase the hydraulic retention time of a process system, and does not produce secondary pollution.
Drawings
FIG. 1 is a schematic process flow diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a denitrification bed according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a uniform distribution plate according to an embodiment of the present invention;
FIG. 4 is a schematic process flow diagram of comparative example 1 of the present invention.
Detailed Description
Preferred embodiments and comparative examples of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
Referring to fig. 1, a preferred embodiment of the present invention provides a process for efficiently removing phosphorus and nitrogen from domestic sewage, wherein raw sewage is sequentially treated by an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, wherein a portion of sludge (return sludge) in the sedimentation tank is subjected to denitrification by a denitrification bed and then returned to the anaerobic tank, and a portion of mixed liquor flowing out of the aerobic tank is subjected to denitrification by a denitrification bed and then returned to the anoxic tank;
as shown in fig. 2, the denitrification bed comprises a shell 1, wherein a first zeolite layer 4, a metal sponge denitrification layer 5 and a second zeolite layer 6 are sequentially arranged in the shell 1 from top to bottom; the preparation method of the metal sponge denitrified layer comprises the following steps:
s1 TiOSO4Dissolved in H at a concentration of 2mol/L2SO4In the solution, mixed solution with titanium ion concentration of 0.015mol/L is obtained, and KNO is added3Adjusting the pH of the solution to 4-5 by using nitric acid and strong ammonia water until the concentration of the solution is 0.02mol/L, and then adding H2O2Until the concentration is 0.015mol/L, obtaining a first mixed solution;
s2 adding octadecyltrimethoxysilane into anhydrous ethanol to form a mixed solution with the concentration of 80mL/L, and adding sodium stearate into the mixed solution to the concentration of 5g/L to obtain a second mixed solution;
s3, mixing the first mixed solution and the second mixed solution according to the volume ratio of 1:2 to form an electrodeposition solution;
s4 ultrasonic stirring with copper foam as cathode and stainless steel as anode at 180mA/cm2At a current density of 1.5 hours, obtaining a surface electrodeposited TiO2Nanocrystalline copper foam;
s5, sequentially adding nitric acid with the mass percentage concentration of 10% and sodium acetate with the mass percentage concentration of 40% into deionized water to form cleaning liquid; soaking the copper foam treated in the step S4 into the cleaning solution for 10 minutes at a constant temperature of 45 ℃;
s6, placing the foam copper cleaned in the step S5 into an electric furnace under the atmosphere of 1MPa nitrogen, and sintering at 800 ℃ for 20 minutes; and then cooling the furnace to room temperature to obtain the foamy copper with the surface sintered with the dendritic nano titanium dioxide crystal, namely the metal sponge denitrified layer 5.
Preferably, a conical uniform distribution plate 3 (shown in fig. 3) is further disposed above the first zeolite layer 4 in the housing 1, and through holes 9 are fully distributed on the uniform distribution plate 3; a shading plate 2 is also arranged above the uniform distribution plate 3, a return pipe 8 for conveying a mixture of sewage and returned sludge is fixed on the shading plate 2, and an outlet of the return pipe 8 is over against the conical tip of the uniform distribution plate 3; the bottom of the second zeolite layer 6 is also provided with an orifice plate 7.
The first zeolite layer 4 is prepared by grinding natural zeolite into granular zeolite with the particle size of 10-20 meshes; the second zeolite layer 6 is formed by grinding natural zeolite into powdery zeolite with the particle size of 100-120 meshes.
Preferably, the weight of the return sludge is 40-60% of the total sludge in the sedimentation tank, and the mass of the denitrifying bacteria agent added into the original sewage is five-eight parts per million of the mass of the return sludge; the mass of the denitrifying bacteria agent added into the backflow mixed liquid is one to five parts per million of the mass of the backflow mixed liquid, and the weight ratio of the backflow mixed liquid to the total mixed liquid is 1-3: 7.
The denitrifying bacteria agent is produced by QINGTAI purificant of Yixing city, Inc.
Comparative example 1
Referring to fig. 4, comparative example 1 of the present invention provides a process for efficient phosphorus and nitrogen removal treatment of domestic sewage (i.e. conventional a2/O process), wherein raw sewage is sequentially treated by an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, wherein a part of sludge (return sludge) in the sedimentation tank directly flows back to the anaerobic tank, and a part of mixed liquor flowing out of the aerobic tank directly flows back to the anoxic tank; the amounts of the returned sludge and the returned mixed liquid were the same as in the above examples.
Comparative example 2
The invention provides a domestic sewage dephosphorization and denitrification high-efficiency treatment process, which is the only difference from the embodiment: the metal sponge denitrified layer 5 is adopted without depositing the TiO2A nanocrystalline original copper foam material.
The denitrification and dephosphorization results of the examples and the comparative examples are shown in the following table:
results Examples Comparative example 1 Comparative example 2
Nitrogen removal rate 92.3% 61.8% 67.3%
Phosphorus removal rate 95.7% 69.4% 74.6%
The above embodiments are only preferred embodiments of the present invention, and it should be understood that the above embodiments are only for assisting understanding of the method and the core idea of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalents and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (3)

1. The utility model provides a domestic sewage dephosphorization denitrogenation high efficiency processing technology, former sewage passes through anaerobism pond, oxygen deficiency pond, good oxygen pond and sedimentation tank in proper order, its characterized in that: wherein, the same part of raw sewage added with the denitrifying bacteria agent in the same part of sludge in the sedimentation tank flows back to the anaerobic tank after passing through the denitrification bed, and the part of mixed liquor flowing out of the aerobic tank flows back to the anoxic tank after passing through the denitrification bed after being added with the denitrifying bacteria agent;
wherein, a first zeolite layer, a metal sponge denitrification layer and a second zeolite layer are sequentially arranged in the denitrification bed from top to bottom; the preparation method of the metal sponge denitrified layer comprises the following steps:
s1 TiOSO4Dissolved in H at a concentration of 2mol/L2SO4In the solution, mixed solution with titanium ion concentration of 0.015mol/L is obtained, and KNO is added3Adjusting the pH of the solution to 4-5 by using nitric acid and strong ammonia water until the concentration of the solution is 0.02mol/L, and then adding H2O2Until the concentration is 0.015mol/L, obtaining a first mixed solution;
s2 adding octadecyltrimethoxysilane into anhydrous ethanol to form a mixed solution with the concentration of 80mL/L, and adding sodium stearate into the mixed solution to the concentration of 5g/L to obtain a second mixed solution;
s3, mixing the first mixed solution and the second mixed solution according to the volume ratio of 1:2 to form an electrodeposition solution;
s4 ultrasonic stirring with foamed copper as cathode and stainless steelAs anode at 180mA/cm2At a current density of 1.5 hours, obtaining a surface electrodeposited TiO2Nanocrystalline copper foam;
s5, sequentially adding nitric acid with the mass percentage concentration of 10% and sodium acetate with the mass percentage concentration of 40% into deionized water to form cleaning liquid; soaking the copper foam treated in the step S4 into the cleaning solution for 10 minutes at a constant temperature of 45 ℃;
s6, placing the foam copper cleaned in the step S5 into an electric furnace under the atmosphere of 1MPa nitrogen, and sintering at 800 ℃ for 20 minutes; and then cooling the furnace to room temperature to obtain the foamy copper with the surface sintered with the dendritic nano titanium dioxide crystal, namely the sponge denitrified layer.
2. The high-efficiency dephosphorization and denitrification treatment process for domestic sewage according to claim 1, which is characterized in that: the first zeolite layer is prepared by grinding natural zeolite into granular zeolite with the particle size of 10-20 meshes.
3. The high-efficiency domestic sewage dephosphorization and denitrification treatment process according to claim 1 or 2, which is characterized in that: the second zeolite layer is formed by grinding natural zeolite into powdery zeolite with the particle size of 100-120 meshes.
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CN113354192A (en) * 2021-05-31 2021-09-07 江苏康源环保科技有限公司 Urban domestic sewage combined biological nitrogen and phosphorus removal device and method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0137306B1 (en) * 1995-02-24 1998-04-25 Dohwa Tec Co Ltd Apparatus for denitrification and dephosphorization of sewage
CN103304101A (en) * 2013-06-27 2013-09-18 波鹰(厦门)科技有限公司 Resource utilization and regeneration circulation utilization device for livestock and poultry breeding wastewater
CN205115141U (en) * 2015-09-14 2016-03-30 天津大学 Device based on SMFC and large -scale filamentous green algae jointly restore eutrophic water
CN105776746A (en) * 2016-04-05 2016-07-20 北京北华中清环境工程技术有限公司 Integrated wastewater treatment process and system for chemical industrial park

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103408127B (en) * 2008-05-20 2016-06-01 北京汉青天朗水处理科技有限公司 A kind of waste disposal plant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0137306B1 (en) * 1995-02-24 1998-04-25 Dohwa Tec Co Ltd Apparatus for denitrification and dephosphorization of sewage
CN103304101A (en) * 2013-06-27 2013-09-18 波鹰(厦门)科技有限公司 Resource utilization and regeneration circulation utilization device for livestock and poultry breeding wastewater
CN205115141U (en) * 2015-09-14 2016-03-30 天津大学 Device based on SMFC and large -scale filamentous green algae jointly restore eutrophic water
CN105776746A (en) * 2016-04-05 2016-07-20 北京北华中清环境工程技术有限公司 Integrated wastewater treatment process and system for chemical industrial park

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