CN110482723A

CN110482723A - A kind of domestic sewage treatment process that dephosphorization quality can be improved

Info

Publication number: CN110482723A
Application number: CN201910823117.2A
Authority: CN
Inventors: 陈燕燕
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-02
Filing date: 2019-09-02
Publication date: 2019-11-22

Abstract

The invention discloses a kind of domestic sewage treatment process that dephosphorization quality can be improved, including preposition precipitating, synchronous precipitation and postposition precipitating, just sedimentation basin is provided in the preposition precipitating, anaerobic pond is provided in the synchronous precipitation, anoxic pond, aerobic tank and secondary sedimentation tank, flocculation basin and contact filtration pond are provided in the postposition precipitating, the domestic sewage treatment process of dephosphorization quality can be improved in this, by being provided with preposition precipitating, pass through delivering medicament, so that the phosphorus total amount in raw water containing P is reduced, and pass through synchronous precipitation, denitrogenation dephosphorizing is carried out to sewage, finally by the second sedimentation basin, sewage after denitrogenation dephosphorizing is subjected to water-dirt separation, pass through flocculation basin, so that the phosphonium ion flocculation agglomeration separated, pass through the strainer in contact filtration pond again, it is filtered, this technique carries out biological phosphate-eliminating to raw water containing P, greatly Phosphor-removing effect is improved greatly, meanwhile, during dephosphorization, by iterative cycles dephosphorization, greatly reduce the phosphorus content of discharge water.

Description

A kind of domestic sewage treatment process that dephosphorization quality can be improved

Technical field

The present invention relates to domestic sewage treatment process field, specially a kind of sanitary sewage disposal that dephosphorization quality can be improved Technique.

Background technique

Nitrogen, phosphorus in municipal sewage is mainly from city domestic sewage, from agricultural fertilizer (nitrogen) and sprinkling clothing medicine (phosphorus Deng), come from industrial wastewater, the main harm of nitrogen, phosphorus: nitrogen and phosphorus can be such that the closing of the unhurried currents such as lake or semi-enclosed water body generates Eutrophication, and water eutrophication has become the great environmental problem in the whole world, biological carbon and phosphorous removal is sought as water body richness is solved The main means of feedingization become the most important thing of sewage treatment field, and existing dephosphorization process is general to use during dephosphorization A2/0 technique carries out denitrogenation dephosphorizing, passes through the various combinations of anaerobic zone, anoxic zone and aerobic zone and different sludge reflux sides Formula causes to remove the activated sludge process sewage water treatment method of organic pollutants and nitrogen, phosphorus etc. since technique is relatively simple The removal effect of phosphorus sum is undesirable, therefore, to solve the above problems, proposing at a kind of sanitary sewage that dephosphorization quality can be improved Science and engineering skill.

Summary of the invention

The purpose of the present invention is to provide a kind of domestic sewage treatment process that dephosphorization quality can be improved, to solve above-mentioned back The undesirable problem of the phosphorus ligands sum of current technology of phosphorus removal from wastewater is proposed in scape technology.

To achieve the above object, the invention provides the following technical scheme: at a kind of sanitary sewage that dephosphorization quality can be improved Science and engineering skill, including preposition precipitating, synchronous precipitation and postposition precipitate, and just sedimentation basin, the synchronization are provided in the preposition precipitating It is provided with anaerobic pond, anoxic pond, aerobic tank and secondary sedimentation tank in precipitating, is provided with flocculation basin and contact in the postposition precipitating Filtering ponds.

Preferably, vortex generating means or power supply are provided in the just sedimentation basin.

Preferably, it is respectively arranged with agitating device in the anaerobic pond and anoxic pond, between the aerobic tank and anoxic pond It is provided with nitrification liquid return flow line.

Preferably, agitating device is provided in the flocculation basin.

Preferably, filter screen is provided in the contact filtration pond.

Technical problem of the invention is also resolved by technical solution below:

A kind of domestic sewage treatment process that dephosphorization quality can be improved, steps are as follows for skill:

S1 is supplied by the first sedimentation basin of inorganic metal salt medicament delivery to preposition precipitating, and by vortex generating means or energy To device, so that inorganic metal salt medicament is sufficiently mixed with the raw water containing P in first sedimentation basin, then, closes vortex and generate equipment Or power supply, so that just sedimentation basin remains static；

S2, it is static after first sedimentation basin in raw water containing P, by precipitating separated；

The upper layer raw water containing P of S3, first sedimentation basin enter in anaerobic pond, by the agitating device in anaerobic pond, so that raw water containing P It is sufficiently mixed with delivering medicament, the amphimicrobian zymophyte in raw water containing P converts the biodegradable organic in sewage to The small molecules tunnings such as volatile fatty acid (VFA), polyP bacteria will also discharge the polyphosphate stored in thallus, release simultaneously Exoergic amount, part of energy inhibit to survive under environment for obligate aerobic polyP bacteria in anaerobism, and another part energy is then for poly- Phosphorus bacterium active absorption is store in thallus similar to the tunning in the sewage such as VFA, and in the form of poly- beta-hydroxy alkanoic acid (PHA) It stores away, in this way, part carbon is removed in anaerobic pond；

S3, after anaerobic pond sufficient dwell time, sewage sludge mixed liquor enters anoxic pond, and is carried out slowly by agitating device Stirring, denitrifying bacteria utilize from aerobic tank through mixed liquor flow back and in a large amount of nitrate of bring and sewage can biology The organic matter of degradation carries out anti-nitration reaction, achievees the purpose that carbon elimination and denitrogenation simultaneously, meanwhile, containing low concentration carbon nitrogen with The sewage of higher concentration phosphorus subsequently enters aerobic tank；

S4, the PHA stored in decomposer under the conditions of aerobic tank polyP bacteria is in aeration aerating simultaneously release energy, and are used for thalli growth And active excess absorbs the dissolved phosphorus in ambient enviroment, these absorbed dissolved phosphorus are in polyP bacteria body with poly- microcosmic salt shape Formula exists, so that the concentration of phosphor in sewage substantially reduces, various organic matters enter after experience anaerobism, anaerobic environment in sewage When aerobic tank its concentration oneself through at a fairly low, this is beneficial to the growth and breeding of Autotrophic nitrification bacterium, and nitrifier is under aerobic environment Ammonification and nitrification will be completed, converts NO2- and NO3- before secondary sedimentation tank for the nitrogen in water, a large amount of reflux is mixed The NOx- of generation will be brought into anoxic zone progress denitrification denitrogenation by closing liquid；

S5, it is flowed into secondary sedimentation tank by the liquid of dephosphorization denitrification and is precipitated again, so that sludge and liquid in liquid Body is separated, meanwhile, the sludge after separation is delivered in anaerobic pond again by draw-off pump, carries out repeating denitrogenation dephosphorizing；

S6, the liquid after separation are flowed into flocculation basin, and by agitating device, so that the flocculation in liquid and flocculation basin Agent is come into full contact with, the flocculation so that ion in liquid agglomerates, will be in liquid finally by the filter screen in contact filtration pond Flocculate and floating material be filtered outflow,

Compared with prior art, the beneficial effects of the present invention are: the domestic sewage treatment process that dephosphorization quality can be improved, passes through It is provided with preposition precipitating, by delivering medicament, so that the phosphorus total amount in raw water containing P is reduced, and by synchronous precipitation, utilizes anaerobism Area, the various combinations of anoxic zone and aerobic zone and different sludge reflux modes remove organic pollutants and nitrogen, phosphorus Deng, meanwhile, it is provided with nitrification liquid return flow line between anoxic pond and aerobic tank, converts NO2- and NO3- In for the nitrogen in water Before secondary sedimentation tank, the NOx- of generation will be brought into anoxic zone and carries out denitrification denitrogenation by a large amount of backflow mixed liquor, to make The concentration for obtaining phosphor in sewage substantially reduces；

By being provided with the second sedimentation basin, the sewage after denitrogenation dephosphorizing is subjected to water-dirt and is separated, and by flocculation basin, makes score The phosphonium ion flocculation agglomeration come is separated out, finally, being filtered, this technique by the strainer in contact filtration pond, to containing P Raw water carries out biological phosphate-eliminating, substantially increases phosphor-removing effect, meanwhile, during dephosphorization, by iterative cycles dephosphorization, drop significantly The phosphorus content of low discharge water.

Detailed description of the invention

Fig. 1 is the principle flow chart of present invention process.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments, is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention,

Referring to Fig. 1, the present invention provides a kind of technical solution:

A kind of domestic sewage treatment process that dephosphorization quality can be improved, including preposition precipitating, synchronous precipitation and postposition precipitating, it is preposition It is provided with just sedimentation basin in precipitating, is provided with vortex generating means or power supply in first sedimentation basin, is generated by vortex Device or power supply, so that inorganic metal salt medicament is sufficiently mixed with the raw water containing P in first sedimentation basin；

It is provided with anaerobic pond, anoxic pond, aerobic tank and secondary sedimentation tank in synchronous precipitation, is respectively set in anaerobic pond and anoxic pond There is agitating device, by agitating device, so that raw water containing P is sufficiently mixed with delivering medicament, is arranged between aerobic tank and anoxic pond There is nitrification liquid return flow line, converts NO2- and NO3- before secondary sedimentation tank for the nitrogen in water, a large amount of backflow mixed liquor Denitrification denitrogenation is carried out by the NOx- of generation is brought into anoxic zone by nitrification liquid return flow line, is provided with flocculation in postposition precipitating Pond and contact filtration pond, contact filtration are provided with filter screen in pond, the flocculation so that ion in liquid agglomerates, finally by contact Filter screen in filtering ponds, by liquid flocculate and floating material be filtered outflow；

BOD5/TP in the water inlet of first sedimentation basin is greater than 15, just can guarantee that polyP bacteria has enough matrix, to obtain ideal Phosphor-removing effect, for this purpose, can using part intake and across primary sedimentation tank method, obtain dephosphorization needed for BOD5 amount, simultaneously 3.5 ~ 7d, temperature control are within the scope of 5 ~ 30 °C and pH value control is in 6 ~ 8 ranges, the release of phosphorus is compared for sludge age control Stablize, preferable phosphor-removing effect can be received.

Its processing step is as follows:

S1 is supplied by the first sedimentation basin of inorganic metal salt medicament delivery to preposition precipitating, and by vortex generating means or energy To device, so that inorganic metal salt medicament is sufficiently mixed with the raw water containing P in first sedimentation basin, when having added dissolubility into sewage Metal salt medicament after, on the one hand deliquescent phosphorus is converted into the phosphate metal salt of non-solubility, can also generate simultaneously non-molten On the other hand the hydroxide (depending on pH value) of solution property gathers as the increase and lesser non-solubility of precipitating object consolidate object Product makes stable elimination of colloid stability, makes to take off steady school body by velocity gradient or diffusion process at biggish non-solubility solids Generation floccule body is contacted with each other, finally by a solid liquid separating step, the mesh of the sewage being purified and solid-liquid concentrate dephosphorization , it then, closes vortex and generates equipment or power supply, so that just sedimentation basin remains static；

The upper layer raw water containing P of S3, first sedimentation basin enter in anaerobic pond, keep under strict control anaerobic environment processed in anaerobic pond, this direct relation To polyP bacteria upgrowth situation, release phosphorus ability and using the ability of organic substrate synthesis PHB, anaerobism pool volume generally presses 0.5 ~ 2h Hydraulic detention time determine, if water inlet in readily biodegradable content of organics it is higher, should try reduce waterpower stop The time is stayed, to guarantee the BOD5 content of aerobic section water inlet, followed by must supply enough dissolved oxygens in aerobic zone, it is poly- to meet Phosphorus bacterium degrades to the PHB of storage, discharges enough energy for its excess and takes the photograph phosphorus, the DO of general anaerobism section will be strict controlled in 0.2mg/L hereinafter, and the DO of aerobic section will be strict controlled in 2mg/L or more, nitrate nitrogen is blasted in anaerobic pond, nitrate nitrogen includes NO3-N and NO2-N, the presence of nitrate nitrogen can also consume organic substrate and inhibit release of the polyP bacteria to phosphorus, to influence Absorption of the polyP bacteria to phosphorus under aerobic condition, in addition, the presence of nitrate nitrogen can be carried out instead by part polyP bacteria as electron acceptor Nitrification, never influences that it carries out fermentation and acid using tunning as electron acceptor, inhibition polyP bacteria releases phosphorus and takes the photograph phosphorus ability And the synthesis capability of PHB, by the agitating device in anaerobic pond, so that raw water containing P is sufficiently mixed with nitrate nitrogen, in raw water containing P Amphimicrobian zymophyte by the biodegradable organic in sewage be converted into the small molecules such as volatile fatty acid (VFA) fermentation Product, polyP bacteria will also discharge the polyphosphate stored in thallus, release energy simultaneously, and part of energy is for obligate aerobic PolyP bacteria anaerobism inhibit environment under survive, another part energy is then for polyP bacteria active absorption similar in the sewage such as VFA Tunning, and be stored up in thallus in the form of poly- beta-hydroxy alkanoic acid (PHA), in this way, part carbon is obtained in anaerobic pond Removal；

S6, the liquid after separation are flowed into flocculation basin, and by agitating device, so that the flocculation in liquid and flocculation basin Agent is come into full contact with, the flocculation so that ion in liquid agglomerates, will be in liquid finally by the filter screen in contact filtration pond Flocculate and floating material be filtered outflow.

Finally it should be noted that the above content is merely illustrative of the technical solution of the present invention, rather than the present invention is protected The limitation of range, the simple modification or equivalent replacement that those skilled in the art carry out technical solution of the present invention, All without departing from the spirit and scope of technical solution of the present invention.

Claims

1. a kind of domestic sewage treatment process that dephosphorization quality can be improved, including preposition precipitating, synchronous precipitation and postposition precipitating, It is characterized in that: being provided with just sedimentation basin in the preposition precipitating, anaerobic pond, anoxic pond, aerobic is provided in the synchronous precipitation Pond and secondary sedimentation tank are provided with flocculation basin and contact filtration pond in postposition precipitating.

2. a kind of domestic sewage treatment process that dephosphorization quality can be improved as described in claim 1, which is characterized in that described first Vortex generating means or power supply are provided in sedimentation basin.

3. a kind of domestic sewage treatment process that dephosphorization quality can be improved as described in claim 1, which is characterized in that described to detest It is respectively arranged with agitating device in oxygen pond and anoxic pond, nitrification liquid return flow line is provided between the aerobic tank and anoxic pond.

4. a kind of domestic sewage treatment process that dephosphorization quality can be improved as described in claim 1, which is characterized in that the wadding Agitating device is provided in solidifying pond.

5. a kind of domestic sewage treatment process that dephosphorization quality can be improved as described in claim 1, which is characterized in that described to connect Filter screen is provided in touching filtering ponds.

6. a kind of domestic sewage treatment process that dephosphorization quality can be improved as described in claim 1, which is characterized in that its technique Steps are as follows: