CN111099726A - Synchronous denitrification and dephosphorization double-sludge sewage treatment system and treatment process thereof - Google Patents

Synchronous denitrification and dephosphorization double-sludge sewage treatment system and treatment process thereof Download PDF

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CN111099726A
CN111099726A CN201811271886.8A CN201811271886A CN111099726A CN 111099726 A CN111099726 A CN 111099726A CN 201811271886 A CN201811271886 A CN 201811271886A CN 111099726 A CN111099726 A CN 111099726A
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tank
sludge
anaerobic
phosphorus
sedimentation tank
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何海周
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Jiangsu Liding Environmental Protection Equipment Co ltd
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Jiangsu Liding Environmental Protection Equipment 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
    • C02F3/30Aerobic and anaerobic processes

Abstract

The invention relates to a synchronous denitrification nitrogen and phosphorus removal double-sludge sewage treatment system and a treatment process thereof, and the system comprises a front-end activated sludge sewage treatment and a rear-end biomembrane sewage treatment double-sludge enhanced microorganism system which are communicated with each other; the front-end activated sludge sewage treatment system consists of an anaerobic tank, an anoxic tank and a sedimentation tank, and realizes synchronous denitrification nitrogen and phosphorus removal; the rear-end biomembrane sewage treatment system consists of an aerobic tank and a secondary sedimentation tank, and the activated sludge and biomembrane sludge system double-membrane reinforced microorganism system realizes deep denitrification and dephosphorization. The invention can resist hydraulic impact load and realize the synchronous deep removal of nitrogen and phosphorus in sewage with low carbon-nitrogen ratio.

Description

Synchronous denitrification and dephosphorization double-sludge sewage treatment system and treatment process thereof
Technical Field
The invention belongs to the technical field of sewage treatment, relates to a synchronous denitrification nitrogen and phosphorus removal double-sludge hydraulic impact resistant sewage treatment system, and particularly relates to a synchronous denitrification nitrogen and phosphorus removal double-sludge sewage treatment system and a treatment process thereof.
Background
In China, as the problems of water resource shortage and water pollution become more serious and the problem of water eutrophication becomes more and more prominent, the sewage discharge standard is continuously strict, and the sewage treatment technology is changed from a stage of singly removing organic matters to a stage of deeply treating the organic matters, removing nitrogen and phosphorus. Although the conventional biological nitrogen and phosphorus removal technology generally has nitrogen and phosphorus removal effects, the requirements on the composition, the substrate type and the environmental conditions of microorganisms are different due to the complex removal of nitrogen and phosphorus, so that the nitrogen and phosphorus removal processes are completed in one system, and the contradiction relationship among the processes is inevitably generated, so that the conventional nitrogen and phosphorus removal technology has certain difficulty and limitation in reaching the standard in application.
The patent of the denitrification nitrogen and phosphorus removal municipal sewage treatment method and device (patent number: CN 200810049350.1) adopts the denitrification nitrogen and phosphorus removal method to treat the municipal sewage. The device comprises an anaerobic tank, a nitrification tank, a denitrification tank and an aeration tank which are sequentially communicated. In the anaerobic tank, sewage passes through a solid-liquid separation device, supernatant enters a nitrification tank, and sludge enters a denitrification tank; in the nitrification tank, under the action of aeration, through a solid-liquid separation device, supernatant enters a denitrification tank, and sludge returns to the nitrification tank through a sludge discharge port of the solid-liquid separation device; in the denitrification tank, sewage enters an aeration tank under the stirring action; in the aeration tank, under the action of aeration, supernatant liquid is discharged through a solid-liquid separation device, partial sludge returns to the anaerobic tank through a sludge discharge pipe, and residual sludge is discharged. In the patent, when the nitrification tank is arranged in front of the nitrification tank, the heterotrophic aerobic bacteria are caused to dominate when the situation that the concentration of organic matters is higher easily occurs, so that the autotrophic aerobic nitrifying bacteria are in an unfavorable state, the nitrification of ammonia nitrogen is incomplete, and the removal rate of nitrogen is greatly reduced; the denitrification tank is arranged behind the denitrification tank, so that the phenomenon of insufficient carbon source required by denitrification reaction is easy to occur, the denitrification is incomplete, and the nitrogen removal effect is not optimal; the sludge in the aeration tank flows back to the anaerobic tank, so that the condition that the anaerobic tank cannot maintain strict anaerobic conditions due to the fact that dissolved oxygen cannot be carried to the anaerobic tank is avoided, and the anaerobic phosphorus release is influenced; the device is a single sludge system, so that the sludge age contradiction among phosphorus accumulating bacteria, denitrifying bacteria and nitrifying bacteria can not be avoided, and the system can not create an optimal growth environment for various floras.
Most of the existing domestic sewage treatment adopts an anaerobic-anoxic-aerobic (A2O) process, and for the traditional biological nitrogen and phosphorus removal technology, in the aspect of biological phosphorus removal, polyphosphate stored in cells is hydrolyzed by phosphorus accumulating bacteria domesticated in an anaerobic/aerobic alternative operation environment, a large amount of energy is released to take up soluble organic matrixes outside the cells, the soluble organic matrixes are stored in the cells in the forms of PHB and glycogen, then the phosphorus accumulating bacteria can utilize exogenous matrixes and PHB stored in vivo to excessively take up phosphorus from the external environment under the aerobic condition, and the phosphorus is stored in vivo in the form of polymerized phosphorus to form high-phosphorus sludge and is finally discharged out of a system, so that the aim of removing phosphorus is fulfilled. In the aspect of biological denitrification, on the basis of converting organic nitrogen into ammonia nitrogen, nitrifying bacteria perform nitration reaction under aerobic conditions to convert the ammonia nitrogen into nitrite nitrogen and nitrate nitrogen, and then convert the nitrate nitrogen into nitrogen to escape from water under anoxic conditions through the denitrification effect of the denitrifying bacteria, thereby achieving the aim of denitrification. Each of the above processes has different purposes, and thus, the denitrification and the dephosphorization are simultaneously completed in one system, which inevitably produces a contradiction between the processes.
(1) In the patent of double-sludge nitrogen and phosphorus removal treatment system (the patent number is CN201020196362. X), a carbon source is added, the cost is high, and secondary pollution to a water body is easily caused;
(2) in the patent of a biological nitrogen and phosphorus removal treatment method combining activated sludge and a biological membrane (patent number: CN 03129319.0), a front-section aerobic tank is required to be not in a nitrification state, but the state of the front-section aerobic tank cannot be strictly controlled in actual operation, and meanwhile, sludge in a sedimentation tank flows back and easily carries dissolved oxygen to an anaerobic tank;
(3) in the patent inverted A2/O sectional water inlet coupled aerobic granular sludge enhanced synchronous nitrification and denitrification nitrogen and phosphorus removal device (patent number: CN 201610211667.5), the nitrogen and phosphorus removal processing technology is complex;
(4) in a patent of a single sludge denitrification dephosphorization denitrogenation device and a method (patent number: CN 200910030057.5), in a single sludge treatment system, a sludge age contradiction exists among nitrifying bacteria, phosphorus accumulating bacteria and denitrifying bacteria;
(5) in a patent of a synchronous denitrification nitrogen and phosphorus removal system for sewage (patent number: CN 201020196350.7), sludge reflowed by a secondary sedimentation unit is easy to carry nitrate nitrogen, and the sludge reflowed to an anaerobic unit consumes organic matters to block anaerobic phosphorus release, so that the later denitrification and phosphorus removal are adversely affected;
(6) the traditional nitrogen and phosphorus removal technology relates to biochemical reaction processes of nitration, denitrification, phosphorus release, phosphorus absorption and the like. The purpose of each process varies, as do the requirements of the composition of the microorganisms, the type of substrate and the environmental conditions. The contradiction problems of the sewage treatment system, such as carbon source, sludge age, nitrate and the like, cause certain difficulty and limitation in the traditional A2O process to reach the discharge standard in practical application.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a synchronous denitrification nitrogen and phosphorus removal double-sludge sewage treatment system and a treatment process thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a two mud sewage treatment systems of synchronous denitrification nitrogen and phosphorus removal which characterized in that: comprises a front-end activated sludge sewage treatment system and a rear-end biological membrane sewage treatment system which are communicated with each other;
the front-end activated sludge sewage treatment system consists of an anaerobic tank, an anoxic tank and a middle sedimentation tank;
wherein the content of the first and second substances,
the anaerobic tank is used for anaerobic phosphorus release reaction, is internally provided with a flow guide slag separation baffle for stirring and mixing, is communicated with the sludge tank and the intermediate sedimentation tank through a first sludge reflux system and a second sludge reflux system respectively, and is communicated with the anoxic tank through an air stripping device;
the anoxic tank is used for denitrifying nitrogen and phosphorus removal, is internally provided with anoxic fixed fillers, is arranged at the middle upper part, is also provided with a submersible stirring device for stirring and mixing, is arranged below the anoxic fixed fillers, is communicated with the intermediate sedimentation tank through a first guide pipe, and is also communicated with the aerobic tank through a nitrification liquid reflux system;
the intermediate sedimentation tank is used for separating mud and water and is communicated with the sludge tank through a first sludge discharge system;
the rear end biological membrane sewage treatment system consists of an aerobic tank and a secondary sedimentation tank;
the aerobic tank is used for nitration reaction, is internally provided with a flowing carrier and is arranged at the middle lower part, and is also provided with an aeration system which is arranged below the flowing carrier and is communicated with the middle sedimentation tank for discharging supernatant through a second guide pipe;
and the secondary sedimentation tank is used for separating mud and water and is communicated with the aerobic tank through a third guide pipe, and the sludge in the secondary sedimentation tank is introduced into the sludge tank through a second sludge discharge system.
Further, the synchronous denitrification and dephosphorization sludge-water treatment system is characterized in that an overflow weir is further arranged in the anaerobic tank, is positioned on the side wall of the anaerobic tank, and is arranged under a discharge hole of the first sludge reflux system.
Still further, the synchronous denitrification nitrogen and phosphorus removal double-sludge sewage treatment system is characterized in that at least one pair of flow guide slag separation baffles are arranged, and the flow guide slag separation baffles are arranged in the anaerobic tank at intervals in a staggered mode.
Still further, the synchronous denitrification nitrogen and phosphorus removal double-sludge sewage treatment system is characterized in that an inclined plate sludge hopper is arranged in the secondary sedimentation tank, and the inclined plate sludge hopper is positioned at the bottom of the secondary sedimentation tank.
Furthermore, the synchronous denitrification nitrogen and phosphorus removal double-sludge sewage treatment system is characterized in that a disinfection tank is arranged in the secondary sedimentation tank, and the disinfection tank is arranged at the water outlet end of the secondary sedimentation tank.
Still further, the synchronous denitrification nitrogen and phosphorus removal double-sludge sewage treatment system is characterized in that a dosing and phosphorus removal device is arranged on the secondary sedimentation tank.
Still further, the synchronous denitrification nitrogen and phosphorus removal double-sludge sewage treatment system is characterized in that a disinfection dosing barrel is arranged on the disinfection tank.
Still further, the synchronous denitrification and dephosphorization double-sludge sewage treatment system further comprises a programmable controller system which is respectively and electrically connected with the gas stripping device, the submersible stirring device, the second sludge reflux system, the first sludge discharge system, the aeration system, the nitrification liquid reflux system, the first sludge reflux system and the second sludge discharge system through the first control regulation system, the second control regulation system, the third control regulation system, the fourth control regulation system, the fifth control regulation system, the sixth control regulation system, the seventh control regulation system and the eighth control regulation system.
A process for treating double-sludge sewage by synchronous denitrification and dephosphorization comprises the following steps:
step 1: raw sewage and return sludge of the intermediate sedimentation tank synchronously enter an anaerobic tank, and anaerobic phosphorus release reaction is carried out under anaerobic conditions;
step 2: the sludge-water mixed liquid in the anaerobic tank and the return nitrification liquid in the aerobic tank enter the anoxic tank, and synchronous denitrification nitrogen and phosphorus removal is carried out by denitrifying phosphorus removal bacteria under the anoxic state;
and step 3: the sludge-water mixed liquor in the anoxic tank flows into a middle sedimentation tank for sludge-water separation, the supernatant flows into an aerobic tank, a part of sludge flows back to the anaerobic tank, and other residual sludge is discharged outside through a pipeline sludge tank to realize phosphorus removal;
and 4, step 4: the aerobic tank carries out nitration reaction under the aeration condition, the reacted nitration liquid flows back to the anoxic tank for carrying out denitrification reaction, and meanwhile, phosphorus-accumulating bacteria in the aerobic state of the aerobic tank adsorb phosphorus substances, so that biologically enhanced phosphorus removal is realized;
and 5: and (3) allowing the mixed liquid in the aerobic tank to flow into a secondary sedimentation tank, settling to ensure that the suspended matters in the effluent reach the standard, discharging the residual sludge into a sludge tank, and discharging the effluent which reaches the standard.
By the scheme, the invention at least has the following advantages:
(1) the invention realizes 'one carbon dual-purpose', anaerobic/anoxic alternate environment design, is particularly suitable for the growth and enrichment of denitrifying phosphorus removal bacteria, so that the denitrifying phosphorus removal bacteria serving as dominant strains can utilize nitrate generated by nitration reaction as an electron acceptor to complete the processes of excessive phosphorus absorption and denitrification in an anoxic environment, thereby achieving the dual purposes of nitrogen and phosphorus removal. The process not only completes denitrification, but also removes phosphorus, saves the consumption of organic matters, avoids the competition of denitrifying bacteria and phosphorus accumulating bacteria for the organic matters, realizes 'one carbon and two purposes', and is suitable for the treatment of sewage with low carbon-nitrogen ratio;
(2) the 'double-sludge' process design adopts an activated sludge method at the front section, so that phosphorus accumulating bacteria and denitrifying phosphorus removing bacteria with shorter sludge age become dominant strains, a good growth environment is created for the phosphorus accumulating bacteria and the denitrifying phosphorus removing bacteria, and phosphorus removal and denitrification reaction are facilitated; the later stage adopts a biofilm method, so that nitrifying bacteria with longer sludge age become dominant bacteria, the growth of the nitrifying bacteria is ensured, enough sludge age is maintained, and the nitrification reaction is facilitated. The 'double-sludge' process design utilizes the respective advantages of an activated sludge method and a biomembrane method, overcomes the sludge age contradiction between the traditional denitrification and dephosphorization, and creates the optimal growth environment for various floras;
(3) the 'triple phosphorus removal' process design of the invention mainly carries out denitrification biological phosphorus removal in an anoxic tank by denitrifying phosphorus removal bacteria, domesticates and cultures a type of denitrifying phosphorus removal bacteria taking nitrate as a final electron acceptor as a dominant strain by an anaerobic/anoxic alternative environment, and completes excessive phosphorus absorption by the metabolic action of the denitrifying phosphorus removal bacteria; secondly, secondary phosphorus absorption can be carried out in the aerobic tank, and when the nitrate in the system is insufficient and the denitrification and phosphorus removal effect cannot be completely removed, the residual phosphorus can be absorbed through the aerobic tank; under special conditions, chemical phosphorus removal can be carried out through a dosing phosphorus removal device arranged on the secondary sedimentation tank, so that 'triple phosphorus removal' is realized, and the deep removal of phosphorus is realized;
(4) according to the invention, the content of nitrate carried by the returned sludge is controlled through the sludge return of the intermediate sedimentation tank, and the denitrifying bacteria are prevented from preemptively consuming easily-degradable organic matters, so that the phosphorus accumulating bacteria serving as weak flora are in an unfavorable position, and the adverse effect on anaerobic phosphorus release is avoided;
(5) the invention adopts the sludge backflow of the intermediate sedimentation tank, controls the content of dissolved oxygen carried by the backflow sludge, and ensures that the anaerobic tank can keep a better anaerobic state and the anaerobic phosphorus release can achieve the best effect;
(6) the invention adopts the sludge backflow of the intermediate sedimentation tank, avoids the influence of a chemical phosphorus removal agent carried by the sludge backflow of the secondary sedimentation tank on the sludge activity of the system under special conditions, and has no secondary water body pollution;
(7) the anoxic tank is arranged in front, alkalinity is generated in the denitrification process, the supplement of part of alkalinity consumed in the nitrification process of the aerobic tank is facilitated, the pH value of the aerobic tank is maintained in a required range, no alkalinity needs to be added externally, the increase of treatment cost is avoided, and secondary pollution is avoided.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below.
FIG. 1 is a schematic structural diagram of a synchronous denitrification dephosphorization and denitrification double-sludge sewage treatment system according to the invention;
FIG. 2 is a block diagram of a process for a synchronous denitrification dephosphorization and denitrification double-sludge sewage treatment system.
The meanings of the reference symbols in the drawings are as follows.
1 Anaerobic tank 1-1 Flow guiding and slag separating baffle
1-2 Air lifting device 1-3 Overflow weir
2 Anoxic pond 2-1 Submersible stirring device
2-2 Oxygen-deficient fixed filler 3 Middle sedimentation tank
4 Aerobic tank 4-1 Aeration system
4-2 Fluid carrier 5 Two heavy ponds
5-1 Sloping plate mud bucket 5-2 Sterilizing medicine adding barrel
5-3 Dosing and phosphorus removal device 6 Disinfection pool
7 Sludge tank 8 Programmable controller system
9-1 First flow guide pipe 9-2 Second flow guide pipe
9-3 Third flow guide pipe 10-1 First sludge return system
10-2 Second sludge return system 10-3 Nitrifying liquid reflux system
10-4 First sludge discharge system 10-5 Second sludge discharge system
11-1 First control regulating system 11-2 Second control regulating system
11-3 Third control regulating system 11-4 Fourth control regulation system
11-5 Fifth control regulating system 11-6 Sixth control regulation system
11-7 Seventh control regulating system 11-8 Eighth control regulating system
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments 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 of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
Examples
A synchronous denitrification dephosphorization double-sludge sewage treatment system comprises a front-end activated sludge sewage treatment system and a rear-end biomembrane sewage treatment system which are communicated with each other. The front-end activated sludge sewage treatment system realizes synchronous denitrification dephosphorization and the back-end biomembrane sewage treatment system realizes deep denitrification dephosphorization, can resist hydraulic impact load and realize synchronous deep removal of nitrogen and phosphorus in sewage with low carbon-nitrogen ratio.
As shown in fig. 1, the front end activated sludge sewage treatment system of the present invention is composed of an anaerobic tank 1, an anoxic tank 2 and a sedimentation tank 3, wherein,
the anaerobic tank 1 is used for anaerobic phosphorus release reaction, a flow guide slag separation baffle 1-1 for stirring and mixing is arranged in the anaerobic tank 1, at least one pair of flow guide slag separation baffles 1-1 are arranged in the anaerobic tank 1 at intervals in a staggered mode and are also communicated with a sludge tank 7 and a middle sedimentation tank 3 through a first sludge reflux system 10-1 and a second sludge reflux system 10-2 respectively, and the anaerobic tank 1 is communicated with the anaerobic tank 2 through an air stripping device 1-2;
the anoxic tank 2 is used for denitrification nitrogen and phosphorus removal, is internally provided with anoxic fixed fillers 2-2, is arranged at the middle upper part, is also provided with a submersible stirring device 2-1 for stirring and mixing, is arranged below the anoxic fixed fillers 2-2, is communicated with the intermediate sedimentation tank 3 through a first guide pipe 9-1, and is also communicated with the aerobic tank 4 through a nitrification liquid reflux system 10-3;
the intermediate sedimentation tank 3 is used for separating mud and water and is communicated with a sludge tank 7 through a first sludge discharge system 10-4.
The rear end biomembrane sewage treatment system of the invention is composed of an aerobic tank 4 and a secondary sedimentation tank 5, wherein,
the aerobic tank 4 is used for nitration reaction, is internally provided with a flowing carrier 4-2 and an aeration system 4-1, is arranged below the flowing carrier 4-2 and is communicated with the intermediate sedimentation tank 3 for discharging supernatant through a second guide pipe 9-2;
and the secondary sedimentation tank 5 is used for separating mud and water and is communicated with the aerobic tank 4 through a third guide pipe 9-3, and the sludge in the secondary sedimentation tank 5 is also introduced into a sludge tank 7 through a second sludge discharge system 10-5.
The invention is especially suitable for the growth and enrichment of denitrifying phosphorus removal bacteria through anaerobic/anoxic alternative environment design, so that the denitrifying phosphorus removal bacteria serving as dominant bacteria can utilize nitrate generated by nitration reaction as an electron acceptor to complete excessive phosphorus absorption and denitrification processes in an anoxic environment, thereby achieving the dual purposes of nitrogen and phosphorus removal. The process not only completes denitrification, but also removes phosphorus, saves the consumption of organic matters, avoids the competition of denitrifying bacteria and phosphorus accumulating bacteria for the organic matters, realizes 'one carbon and two purposes', and is suitable for the treatment of sewage with low carbon-nitrogen ratio.
The front section of the invention adopts an activated sludge method, so that phosphorus accumulating bacteria and denitrifying phosphorus removal bacteria with shorter sludge age become dominant bacteria, a good growth environment is created for the phosphorus accumulating bacteria and the denitrifying phosphorus removal bacteria, and phosphorus removal and denitrification reaction are facilitated; the later stage adopts a biofilm method, so that nitrifying bacteria with longer sludge age become dominant bacteria, the growth of the nitrifying bacteria is ensured, enough sludge age is maintained, and the nitrification reaction is facilitated. The 'double-sludge' process design utilizes the respective advantages of an activated sludge method and a biomembrane method, overcomes the sludge age contradiction between the traditional denitrification and dephosphorization, and creates the optimal growth environment for various floras.
In the invention, denitrifying biological phosphorus removal is carried out in an anoxic tank by denitrifying phosphorus removal bacteria, a type of denitrifying phosphorus removal bacteria taking nitrate as a final electron acceptor is domesticated and cultured as a dominant strain by an anaerobic/anoxic alternative environment, and excessive phosphorus absorption is completed by the metabolic action of the denitrifying phosphorus removal bacteria; secondly, secondary phosphorus absorption can be carried out in the aerobic tank, and when the nitrate in the system is insufficient and the denitrification and phosphorus removal effect cannot be completely removed, the residual phosphorus can be absorbed through the aerobic tank; under special conditions, chemical phosphorus removal can be carried out through a dosing phosphorus removal device arranged on the secondary sedimentation tank, triple phosphorus removal is achieved, and deep phosphorus removal is achieved.
The flow guide and slag separation baffle 1-1 and the submersible stirring device 2-1 can be used for keeping sludge in a suspension state and completely mixing mud and water.
In the invention, an overflow weir 1-3 is also arranged in the anaerobic tank 1, is positioned on the side wall of the anaerobic tank 1 and is also arranged right below a discharge hole of a first sludge reflux system 10-1. The overflow weir 1-3 can realize water inlet regulation and uniform water distribution, and has a slag separation effect to a certain extent.
In the invention, an inclined plate mud bucket 5-1 is arranged in the secondary sedimentation tank 5, is positioned at the bottom of the secondary sedimentation tank 5, and is provided with an inclined plate inclination in combination with a sedimentation repose angle to prevent sludge accumulation.
According to the invention, a disinfection tank 6 is arranged in the secondary sedimentation tank 5 and is positioned at the water outlet end of the secondary sedimentation tank 5, a dosing and phosphorus removing device 5-3 is arranged on the secondary sedimentation tank 5, a disinfection dosing barrel 5-2 is arranged on the disinfection tank 6, and the secondary sedimentation tank 5 can be deeply treated through the disinfection dosing barrel 5-2 and the dosing and phosphorus removing device 5-3, so that the effluent TP and fecal escherichia coli reach the standard and are discharged.
The invention also comprises a programmable controller system 8 which is electrically connected with the gas stripping device 1-2, the submersible stirring device 2-2, the second sludge reflux system 10-2, the first sludge reflux system 10-4, the aeration system 4-1, the nitrification liquid reflux system 10-3, the first sludge reflux system 10-1 and the second sludge reflux system 10-5 through a first control regulation system 11-1, a second control regulation system 11-2, a third control regulation system 11-3, a fourth control regulation system 11-4, a fifth control regulation system 11-5, a sixth control regulation system 11-6, a seventh control regulation system 11-7 and an eighth control regulation system 11-8. The automatic control of the gas stripping device 1-2, the submersible stirring device 2-2, the second sludge reflux system 10-2, the first sludge reflux system 10-4, the aeration system 4-1, the nitrification liquid reflux system 10-3, the first sludge reflux system 10-1 and the second sludge reflux system 10-5 is realized by controlling the first control and regulation system 11-1, the second control and regulation system 11-2, the third control and regulation system 11-3, the fourth control and regulation system 11-4, the fifth control and regulation system 11-5, the sixth control and regulation system 11-6, the seventh control and regulation system 11-7 and the eighth control and regulation system 11-8 through a PLC (programmable logic controller), the artificial participation is reduced, the workload is reduced, the programmable controller system is controlled by the PLC, a remote platform can be accessed to enable automatic monitoring so that maintenance personnel can also know the specific status of each pool.
The first sludge return system 10-1 comprises a sludge return valve and a return pipeline of the sludge tank; the second sludge return system 10-2 comprises a sludge return valve of the intermediate sedimentation tank and a return pipeline.
The first sludge discharge system 10-4 comprises a sludge discharge valve of a sedimentation tank and a sludge pipeline; the second sludge discharge system 10-5 comprises a sludge discharge valve of a secondary sedimentation tank and a sludge pipeline.
The first control and regulation system 11-1 comprises an anaerobic gas stripping control valve and a gas pipeline; the second control and regulation system 11-2 comprises an anoxic stirring gas stripping control valve and a gas pipeline, and the third control and regulation system 11-3 comprises a sludge reflux gas stripping control valve of the intermediate sedimentation tank and a gas pipeline; the fourth control and regulation system 11-4 comprises a gas stripping and sludge discharging control valve of the intermediate sedimentation tank and a gas pipeline; the fifth control and regulation system 11-5 comprises an aeration control valve of the aerobic tank and a gas pipeline; the sixth control and regulation system 11-6 comprises a nitration liquid reflux gas stripping control valve and a gas pipeline; the seventh control and regulation system 11-7 comprises a sludge return gas stripping control valve and a gas pipeline of the sludge tank, and the eighth control and regulation system 11-8 comprises a sludge discharge gas stripping control valve and a gas pipeline of the secondary sedimentation tank.
As shown in FIG. 2, a process for treating double-sludge sewage by synchronous denitrification and dephosphorization comprises the following steps:
step 1: the raw sewage and the return sludge of the intermediate sedimentation tank 3 synchronously enter an anaerobic tank 1 to carry out anaerobic phosphorus release reaction under anaerobic conditions;
step 2: the sludge-water mixed liquid in the anaerobic tank 1 and the return nitrifying liquid in the aerobic tank 4 enter the anoxic tank 2, and synchronous denitrification nitrogen and phosphorus removal is carried out by denitrifying phosphorus removal bacteria under an anoxic state;
and step 3: the sludge-water mixed liquor in the anoxic tank 2 flows into the intermediate sedimentation tank 3 for sludge-water separation, the supernatant flows into the aerobic tank 4, a part of sludge flows back to the anaerobic tank 1, and other residual sludge is discharged through the pipeline sludge tank 7 to realize dephosphorization;
and 4, step 4: the aerobic tank 4 is subjected to nitration reaction under the aeration condition, the reacted nitration liquid flows back to the anoxic tank 2 for denitrification reaction, and meanwhile, phosphorus-accumulating bacteria in the aerobic state of the aerobic tank adsorb phosphorus substances, so that biologically enhanced phosphorus removal is realized;
and 5: the mixed liquid in the aerobic tank 4 flows into a secondary sedimentation tank 5, after sedimentation, the effluent suspended matters are ensured to reach the standard, the residual sludge is discharged into a sludge tank 7, and the effluent is discharged after reaching the standard.
In the process, the domestic sewage collected through the net pipes is treated by the septic tank, then treated by the grid regulating tank, and then enters the anaerobic tank.
The invention has at least the following advantages:
(1) the invention domesticates and cultures a denitrifying phosphorus removal bacterium taking nitrate as a final electron acceptor as a dominant strain through an anaerobic/anoxic alternative environment, and simultaneously completes the processes of excessive phosphorus absorption and denitrification through the metabolic action of the denitrifying phosphorus removal bacterium to achieve the dual purposes of nitrogen and phosphorus removal. The process not only completes denitrification, but also removes phosphorus, saves 50% of the consumption of organic matters, realizes 'one carbon dual-purpose', avoids competition between denitrifying bacteria and phosphorus accumulating bacteria for the organic matters, and is suitable for urban sewage with low carbon-nitrogen ratio; the aeration quantity is reduced by 30 percent, and the electric energy is saved; the sludge generated in the operation of the traditional nitrogen and phosphorus removal process is reduced, so that the sludge treatment cost is reduced; the volume of the reactor can be reduced;
(2) the 'double-sludge' process design of the invention adopts an activated sludge method at the front section and a biomembrane method at the rear section, overcomes the sludge age contradiction between the traditional denitrification and dephosphorization by utilizing the respective advantages of the activated sludge method and the biomembrane method, and creates the optimal growth environment for various floras;
(3) in the aspect of phosphorus removal, biological denitrification phosphorus removal is mainly carried out in the anoxic tank by denitrifying phosphorus removal bacteria, secondary phosphorus absorption can be carried out in the aerobic tank, and residual phosphorus which is not completely absorbed by phosphorus in the anoxic tank is absorbed;
(4) according to the invention, the sludge in the intermediate sedimentation tank flows back, so that the content of nitrate in the returned sludge is controlled, and the influence on anaerobic phosphorus release caused by the preemptive consumption of nitrate and the degradation of organic matters is avoided;
(5) the invention adopts the sludge backflow of the intermediate sedimentation tank, and controls the content of dissolved oxygen carried by the backflow sludge, so that the anaerobic tank can keep a better anaerobic state;
(6) the invention has no secondary water body pollution, and the sludge backflow of the intermediate sedimentation tank is adopted, thereby avoiding the influence of a chemical phosphorus removal agent carried by the sludge backflow of the intermediate sedimentation tank on the sludge activity of the system under special conditions;
(7) the anoxic tank is arranged in front, which is beneficial to supplementing a part of alkalinity consumed by the aerobic tank in the nitration process and is beneficial to maintaining the pH value of the aerobic tank in a required range.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (9)

1. The utility model provides a two mud sewage treatment systems of synchronous denitrification nitrogen and phosphorus removal which characterized in that: comprises a front-end activated sludge sewage treatment system and a rear-end biological membrane sewage treatment system which are communicated with each other;
the front-end activated sludge sewage treatment system consists of an anaerobic tank (1), an anoxic tank (2) and a middle sedimentation tank (3);
wherein the content of the first and second substances,
the anaerobic tank (1) is used for anaerobic phosphorus release reaction, a flow guide and slag separation baffle (1-1) for stirring and mixing is arranged in the anaerobic tank, the anaerobic tank is communicated with the sludge tank (7) and the intermediate sedimentation tank (3) through a first sludge reflux system (10-1) and a second sludge reflux system (10-2), and the anaerobic tank (1) is communicated with the anoxic tank (2) through an air stripping device (1-2);
the anaerobic tank (2) is used for denitrification nitrogen and phosphorus removal, is internally provided with an anaerobic fixed filler (2-2), is arranged at the middle upper part, is also provided with a submersible stirring device (2-1) for stirring and mixing, is arranged below the anaerobic fixed filler (2-2), is communicated with the intermediate sedimentation tank (3) through a first guide pipe (9-1), and is also communicated with the aerobic tank (4) through a nitrification liquid reflux system (10-3);
the intermediate sedimentation tank (3) is used for separating mud and water and is communicated with the sludge tank (7) through a first sludge discharge system (10-4);
the rear end biological membrane sewage treatment system consists of an aerobic tank (4) and a secondary sedimentation tank (5);
the aerobic tank (4) is used for nitration reaction, is internally provided with a flowing carrier (4-2) and is arranged at the middle lower part, and is also provided with an aeration system (4-1) which is arranged below the flowing carrier (4-2) and is communicated with the intermediate sedimentation tank (3) for discharging supernatant through a second guide pipe (9-2);
and the secondary sedimentation tank (5) is used for separating mud and water and is communicated with the aerobic tank (4) through a third guide pipe (9-3), and the sludge in the secondary sedimentation tank (5) is also introduced into a sludge tank (7) through a second sludge discharge system (10-5).
2. The synchronous denitrification dephosphorization sludge water treatment system according to claim 1, wherein: the anaerobic tank (1) is also internally provided with an overflow weir (1-3) which is arranged on the side wall of the anaerobic tank (1) and is arranged under the discharge hole of the first sludge reflux system (10-1).
3. The synchronous denitrification dephosphorization sludge water treatment system according to claim 1, wherein: at least one pair of flow guide and slag separation baffles (1-1) is arranged in the anaerobic tank (1) at intervals in a staggered manner.
4. The synchronous denitrification dephosphorization sludge water treatment system according to claim 1, wherein: an inclined plate mud bucket (5-1) is arranged in the secondary sedimentation tank (5), and is positioned at the bottom of the secondary sedimentation tank (5).
5. The synchronous denitrification dephosphorization sludge water treatment system according to claim 1, wherein: a disinfection tank (6) is arranged in the secondary sedimentation tank (5), and is arranged at the water outlet end of the secondary sedimentation tank (5).
6. The synchronous denitrification dephosphorization sludge water treatment system according to claim 1, wherein: and a dosing and phosphorus removal device (5-3) is arranged on the secondary sedimentation tank (5).
7. The synchronous denitrification dephosphorization sludge water treatment system according to claim 5, wherein: a disinfection medicine adding barrel (5-2) is arranged on the disinfection tank (6).
8. The synchronous denitrification dephosphorization sludge water treatment system according to claim 1, wherein: also comprises a programmable controller system (8) which is respectively connected with the air stripping device (1-2) through a first control and regulation system (11-1), a second control and regulation system (11-2), a third control and regulation system (11-3), a fourth control and regulation system (11-4), a fifth control and regulation system (11-5), a sixth control and regulation system (11-6), a seventh control and regulation system (11-7) and an eighth control and regulation system (11-8), the device comprises a submersible stirring device (2-2), a second sludge backflow system (10-2), a first sludge discharge system (10-4), an aeration system (4-1), a nitrifying liquid backflow system (10-3), the first sludge backflow system (10-1) and the second sludge discharge system (10-5) which are electrically connected.
9. A process for treating double-sludge sewage by synchronous denitrification and dephosphorization is characterized by comprising the following steps:
step 1: the raw sewage and the return sludge of the intermediate sedimentation tank (3) synchronously enter an anaerobic tank (1) to carry out anaerobic phosphorus release reaction under anaerobic conditions;
step 2: the sludge-water mixed liquor in the anaerobic tank (1) and the return nitrifying liquid in the aerobic tank (4) enter the anoxic tank (2), and synchronous denitrification nitrogen and phosphorus removal is carried out by denitrifying phosphorus removal bacteria under an anoxic state;
and step 3: the sludge-water mixed liquor in the anoxic tank (2) flows into the intermediate sedimentation tank (3) for sludge-water separation, the supernatant flows into the aerobic tank (4), a part of sludge flows back to the anaerobic tank (1), and other residual sludge is discharged through the pipeline sludge tank (7) to realize phosphorus removal;
and 4, step 4: the aerobic tank (4) carries out nitration reaction under the aeration condition, the reacted nitration liquid flows back to the anoxic tank (2) for denitrification reaction, and meanwhile, phosphorus-accumulating bacteria in an aerobic state in the aerobic tank (4) adsorb phosphorus substances, so that biologically enhanced phosphorus removal is realized;
and 5: the mixed liquid in the aerobic tank (4) flows into a secondary sedimentation tank (5), after sedimentation, the effluent suspended matters are ensured to reach the standard, the residual sludge is discharged into a sludge tank (7), and the effluent is discharged after reaching the standard.
CN201811271886.8A 2018-10-29 2018-10-29 Synchronous denitrification and dephosphorization double-sludge sewage treatment system and treatment process thereof Pending CN111099726A (en)

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CN112225397A (en) * 2020-09-28 2021-01-15 北京恩菲环保技术有限公司 Sewage treatment system and method based on double-sludge denitrification dephosphorization and biological filter tower
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