CN105984991A

CN105984991A - Process for advanced treatment of sewage

Info

Publication number: CN105984991A
Application number: CN201510054611.9A
Authority: CN
Inventors: 张卫东; 魏国栋; 张宁; 姚俊
Original assignee: JIANGSU ZONJIN ENVIRONMENT TECHNOLOGY Co Ltd
Current assignee: JIANGSU ZONJIN ENVIRONMENT TECHNOLOGY Co Ltd
Priority date: 2015-02-02
Filing date: 2015-02-02
Publication date: 2016-10-05
Anticipated expiration: 2035-02-02
Also published as: CN105984991B

Abstract

The invention discloses a process for advanced treatment of sewage. The process combines various sewage treatment systems including an anoxic BAF biological filter, an aerobic BAF biological filter, an ozone contact reaction tank and an aerobic BAC biological filter. The process is simple to operate and manage and is high in automation degree and low in energy consumption, the direct operation cost for treating waste water per ton is only 1.2 Yuan, and 200-20000 cubic meters of RO concentrated water can be treated every day; the COD of effluent water after treatment is less than or equal to 50mg/L, the NH3-N is less than or equal to 5mg/L, the TN is less than or equal to 15mg/L, and the pH value is 6-9; the water is free of residual chlorine and other oxidative substances; and the effluent water can be directly discharged under a certain standard or recycled.

Description

A kind of sewerage advanced treatment process

Technical field

The present invention relates to the sewage disposal of field of Environment Protection, be specifically related to a kind of anoxia BAF biofilter+good of using Oxygen BAF biofilter+ozone contact reaction pond+aerobic BAC biofilter " associating sewerage advanced treatment process.

Background technology

In prior art, the method removing COD, NH3-N and total nitrogen is a lot, generally uses A/O method, chemical oxygen Which kind of method is the method such as change method, BAF, BAC, concrete use, need to be according to concrete water quality depending on.A/O method is normal Except COD, denitrogenation method, be used for processing the waste water of higher COD concentration, and waste water have certain life The property changed；Chemical oxidization method is used for processing virose Organic substance or the very poor organic process of biodegradability, General not individual processing, for the pretreatment of other technique；BAF has a various ways: anaerobism, anoxia, aerobic 3 kinds of forms, are used for the advanced treating of waste water, have preferably except COD, denitrification functions, are that one compares Novel water processing mode；The new wastewater treatment method that BAC is a kind of microorganism and activated carbon combines, fully Utilize the synergism of microorganism and filler, can fully remove the dirts such as COD, SS, the NH3-N in water and total nitrogen Dye thing, effluent quality is excellent, is mainly used in the advanced treating of difficult water.

Biological aerated filter BAF is that a kind of high load capacity submerged fixes film phase reactor, in 20th century 70 First early 1980s age end uses successfully in France, obtains on Europe, America, Japan and other places subsequently Popularization and application are arrived.Being mainly characterized by of biological aerated filter use the less bulk material of particle diameter as filtrate, Filtrate is submerged in water, utilizes blast aeration oxygen supply.The effect one of filtrate is as microorganism carrier, can cut Staying substantial amounts of microorganism, particularly in the presence of having ammonia nitrogen in waste water, a large amount of generation times wherein retained are longer Nitrifier denitrogenation is had vital effect；Two can serve as filter medium, retain into the suspension in water Solid and the biosolids being newly formed, thus save the secondary sedimentation tank in other biological facture, obtain high-quality Water outlet.

Process has salinity height, COD, TN are high and B/C is low (estimating below 0.1), difficult biochemical RO During dense water, because of the organic pollution in water by the biochemical system intensive treatment of prime, remaining COD performance Going out very difficult biochemical degradation, it is processed by the A/O method as used, then be difficult to gather effect, must carry out it Chemical oxidation treatment, improves the B/C ratio of waste water, carries out biochemical treatment more relatively suitable, for can ensure that water outlet reaches Mark discharge, it is necessary to finding can be to sewerage advanced treatment process.

Summary of the invention

The present invention is in order to make up the deficiencies in the prior art, it is provided that a kind of employing anoxia BAF biofilter+aerobic BAF biofilter+ozone contact reaction pond+aerobic BAC biofilter " associating sewerage advanced treatment process. This technique includes following step:

1), the dense water of RO cache in the dense pond of RO, and regulating water quality and the water yield；

2) water outlet, in the dense pond of RO by water inlet manifold road system improving to anoxia BAF biofilter, one Aspect, the larger molecular organics in water is degraded to little point by the facultative hydrolysis acidification bacterium in anoxia BAF biofilter Sub-Organic substance, improves the B/C ratio of waste water, and on the other hand denitrifying bacterium is by the nitrate in waste water, nitrite Change into nitrogen, thus remove the TN in water and part COD；For guaranteeing the normal growth of denitrifying bacterium, generation Thank, the pipeline of the water inlet manifold road system being connected with anoxia BAF biofilter in the dense pond of RO is provided with Carbon source dosing system；

3), the configured aerobic BAF on top, anoxia BAF biofilter of the water outlet in anoxia BAF biofilter Inlet pipeline system enters aerobic BAF biofilter, and aeration air inlet pipe is aerobic BAF biofilter aeration simultaneously Oxygen supplement, utilizes the metabolic activity of aerobic microbiological in aerobic BAF thing filter tank, by the organic pollution in water COD degradation is the simple inorganic matter such as water, carbon dioxide；

4), a water outlet part for aerobic BAF biofilter enters smelly by aerobic BAF biofilter outlet pipeline Oxygen contact-oxidation pool, another part is back to anoxia BAF biofilter by nitrification liquid reflux pipe, carries out anti- Nitrification denitrogenation；In ozone contact reaction pond, utilize the strong oxidation of ozone, on the one hand by difficult degradation in water Long-chain, heterocyclic Organic substance carry out chain rupture, open loop, be degraded to can be biochemical Organic substance, beneficially rear class BAC Removing the degree of depth of COD, on the other hand ozone can also be by the oxidation Decomposition directly or indirectly of part COD in water The inorganic substances such as Cheng Shui, carbon dioxide；

5) water after, O3 contacted oxidation pond processes is water in the middle of O3 contacted oxidation pond outlet pipeline enters Pond, becomes oxygen by the ozone decomposed remained in water, eliminates the impact biochemical on rear class, and can provide oxygen in water Source, plays effect of preaeration；

6), the water outlet of intermediate pool enters aerobic through intermediate pool elevator pump and intermediate pool outlet pipeline system BAC biofilter carries out biochemical reaction, removes COD, NH3-N, the TN in water further；

7), the water outlet of aerobic BAC biofilter enter discharge bay through aerobic BAC biofilter outlet pipeline system, Then water outlet overflow qualified discharge.

Further, the filtrate in described anoxia BAF biofilter and aerobic BAF biofilter be zeolite or Haydite, the described filtrate in aerobic BAC biofilter is biological carbon leaching material.

Further, described anoxia BAF biofilter, aerobic BAF biofilter, aerobic BAC biological filter Chi Jun configures pneumatic operated valve, effusion meter, Pressure gauge, can realize the operation such as fully automatic operation, backwash, and described is smelly The configuration of oxygen haptoreaction pond pneumatic operated valve, liquidometer, effusion meter, Pressure gauge, can realize fully automatic operation.

Further, described carbon source dosing system include dosing dosing pump, nutritional solution dissolve case, agitating device and Magnetic flap level gauge.

Further, for guaranteeing the quantity of dominant bacteria in anoxia BAF biofilter, can throw in it if desired Add appropriate obligate bacterium, to increase the degraded to COD and the removal to nitrogen.

The employing anoxia BAF biofilter of the present invention+aerobic BAF biofilter+ozone contact reaction pond+aerobic BAC biofilter " associating sewerage advanced treatment process have the advantages that

One, technological process is short, floor space is little, can process the dense water of RO of 200～20000 cubic metres every day, When influent quality is COD≤350mg/L NH3-N≤35mg/L TN≤60mg/L PH6～9 Time, system effluent quality energy stably reaching standard, i.e. COD≤50mg/L, NH3-N≤5mg/L, TN≤15 Mg/L, PH are 6～9, and water outlet can direct qualified discharge；

Two, this technological operation is simple, operational management convenient, and automaticity is high, produces without mud, system Equipment only needs regular backwash；

Three, this technique power consumption is few, and energy consumption is low, processes the direct operating cost of water per ton and is only the electricity charge 0.924 Unit+medicament expense is with 0.284 yuan=1.2 yuan/ton waste water.

Accompanying drawing explanation

Accompanying drawing is for providing a further understanding of the present invention, and constitutes a part for description, with the present invention The embodiment of type is used for explaining the present invention together, is not intended that limitation of the present invention.In the accompanying drawings:

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

Detailed description of the invention

Hereinafter the preferred embodiments of the present invention are illustrated, it will be appreciated that preferred embodiment described herein It is merely to illustrate and explains the present invention, being not intended to limit the present invention.

A kind of sewerage advanced treatment process, including following step:

1), the dense water of RO cache in the dense pond of RO 1, and regulating water quality and the water yield；

2), the water outlet in the dense pond of RO 1 is promoted to anoxia BAF biofilter by water inlet manifold road system 20 2, on the one hand, the larger molecular organics in water is dropped by the facultative hydrolysis acidification bacterium in anoxia BAF biofilter 2 Solve as small organic molecule, improve the B/C ratio of waste water, on the other hand denitrifying bacterium by the nitrate in waste water, Nitrite transformation becomes nitrogen, thus removes the TN in water and part COD；For guaranteeing the normal of denitrifying bacterium Growth, metabolism, the water inlet manifold road system 20 being connected with anoxia BAF biofilter 2 in the dense pond of RO 1 Pipeline on be provided with carbon source dosing system 22；

3), configured aerobic on top, anoxia BAF biofilter 2 of the water outlet in anoxia BAF biofilter 2 BAF inlet pipeline system 3 enters aerobic BAF biofilter 4, and aeration air inlet pipe 18 is aerobic BAF simultaneously Biofilter 4 aeration oxygen replenishing, utilizes the metabolic activity of aerobic microbiological in aerobic BAF thing filter tank 3, by water In organic pollution COD degradation be the simple inorganic matter such as water, carbon dioxide；

4), a water outlet part for aerobic BAF biofilter 3 passes through aerobic BAF biofilter outlet pipeline 6 Entering O3 contacted oxidation pond 7, it is biological that another part is back to anoxia BAF by nitrification liquid reflux pipe 19 Filter tank 2, carries out denitrification denitrogenation；In ozone contact reaction pond 7, utilize the strong oxidation of ozone, one The long-chain of difficult degradation, heterocyclic Organic substance in water are carried out chain rupture, open loop by aspect, be degraded to can be biochemical organic The degree of depth of COD is removed by thing, beneficially rear class BAC, and on the other hand ozone can also be direct by part COD in water Or inorganic substances such as oxidation Decomposition Cheng Shui, carbon dioxide indirectly；

5) water after, O3 contacted oxidation pond 7 processes is in O3 contacted oxidation pond outlet pipeline 10 enters Between pond 11, the ozone decomposed remained in water is become oxygen, eliminates the impact biochemical on rear class, and can be to water Middle offer oxygen source, plays effect of preaeration；

6), the water outlet of intermediate pool 11 is through intermediate pool elevator pump 12 and intermediate pool outlet pipeline system 13 Enter aerobic BAC biofilter 14 and carry out biochemical reaction, remove COD, NH3-N, the TN in water further；

7), the water outlet of aerobic BAC biofilter 14 enters through aerobic BAC biofilter outlet pipeline system 15 Discharge bay 16, then water outlet overflow qualified discharge.

Wherein the specification in the dense pond of RO is 6m × 6m × 5m, and dischargeable capacity is 200 cubic metres, and material is steel concrete； The dense pond of RO is configured with ultrasonic level gage 1 and overlaps；Anoxia BAF biofilter and aerobic BAF biofilter Specification is 7.5m × 3.5m × 6.5m, and effective time of staying is about 3h, filler 115 cubic metres；Ozone connects The dischargeable capacity touching reaction tank is 100 cubic metres, and effective time of staying is about 1h, is configured with pottery diamond spar The micro-hole aerator 3 of material overlaps, and the aeration house steward 3 of SS304 material overlaps, tail gas collection system, water distribution system

；The dischargeable capacity of intermediate pool is 150 cubic metres, and effective time of staying is about 1.5h；BAC is biological The specification in filter tank is 7.5m × 3.5m × 5.5m, and effective time of staying is about 2h, is provided with filler 115 and stands Side's rice；The dischargeable capacity in discharge pond is 300 cubic metres.

The direct operating cost of this technique is mainly only 1.2 yuan/ton of waste water, Qi Zhong electricity by power consumption and reagent consumption Take (based on 0.6 yuan/KW), then processing water power per ton consumption is: 154 × 0.6 ÷ 100=0.924 yuan/ton waste water；

Medicament expense is used:

A, methanol (calculating by 2.3 yuan/Kg, dosage is based on 80mg/L): 0.08 × 2.3=0.184 unit/ Ton water

B, other medicament expense are about (such as nutrient, microbial inoculum): 0.1 yuan

Then process the direct operating cost of water per ton to add up to:

0.924+0.1+0.184=1.2 yuan/ton of waste water.

When influent quality is COD≤350mg/L NH3-N≤35mg/L TN≤60mg/L During PH6～9, after native system processes, effluent quality COD≤50mg/L, NH3-N≤5mg/L, TN≤15mg/L, PH are 6～9, and water outlet can directly qualified discharge or reuse.

Last it is noted that the foregoing is only the preferred embodiments of the present invention, it is not limited to this Invention, although being described in detail the present invention with reference to previous embodiment, for those skilled in the art For, the technical scheme described in foregoing embodiments still can be modified by it, or to wherein part Technical characteristic carries out equivalent.All within the spirit and principles in the present invention, any amendment of being made, equivalent Replacement, improvement etc., should be included within the scope of the present invention.

Claims

1. a sewerage advanced treatment process, it is characterised in that include following step:

2. a kind of sewerage advanced treatment process as claimed in claim 1, it is characterised in that described anoxia Filtrate in BAF biofilter and aerobic BAF biofilter is zeolite or haydite.

3. a kind of sewerage advanced treatment process as claimed in claim 1, it is characterised in that described is aerobic Filtrate in BAC biofilter is biological carbon leaching material.

4. a kind of sewerage advanced treatment process as claimed in claim 1, it is characterised in that periodically to anoxia Adding obligate bacterium in BAF biofilter, described obligate bacterium is for increasing the degraded of COD and to nitrogen after domestication The flora removed.