CN108341553B - Method for treating high ammonia nitrogen wastewater by combining biomembrane method with BAF combined process - Google Patents

Method for treating high ammonia nitrogen wastewater by combining biomembrane method with BAF combined process Download PDF

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CN108341553B
CN108341553B CN201810207592.2A CN201810207592A CN108341553B CN 108341553 B CN108341553 B CN 108341553B CN 201810207592 A CN201810207592 A CN 201810207592A CN 108341553 B CN108341553 B CN 108341553B
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wastewater
ammonia nitrogen
baf
nitrogen
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CN108341553A (en
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周会勇
李元海
汪万新
孙振兴
张立武
王毅强
王毅刚
王斌
陈刚应
王清
刘勇
赵磊
冯睿
李亮
黄巨才
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Hubei Shuanghuan Science And Technology Stock Co ltd
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    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
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    • C02F1/00—Treatment of water, waste water, or sewage
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    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2209/14—NH3-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/16—Total nitrogen (tkN-N)
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    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/14—Maintenance of water treatment installations
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract

The invention discloses a method for treating high ammonia nitrogen wastewater by combining a biomembrane method and a BAF combined process, which comprises the following steps: (1) pretreating the wastewater in a regulating reservoir to remove partial oil stains and suspended matters; (2) the wastewater enters an aerobic nitrification tank and the ammonia nitrogen in the wastewater is converted into nitrate nitrogen by adopting a three-stage continuous nitrification process; then the wastewater enters a post-denitrification tank, nitrate nitrogen in the wastewater is converted into nitrogen by adopting a two-stage continuous denitrification process, and COD is removed; (3) and (4) entering a high-density sedimentation tank, fully precipitating, concentrating and clarifying, and entering a BAF biological aerated filter to remove redundant COD and ammonia nitrogen. The invention can not only make ammonia nitrogen and total nitrogen reach the standard, the system is very stable, but also achieve the design goals of small occupied area, low treatment cost and extremely small generation amount of excess sludge, thereby proving the superiority of the process as a high ammonia nitrogen wastewater treatment technology.

Description

Method for treating high ammonia nitrogen wastewater by combining biomembrane method with BAF combined process
Technical Field
The invention relates to sewage treatment, in particular to a method for treating high ammonia nitrogen wastewater by combining a biomembrane process and a BAF combined process.
Background
The Biological Aerated Filter (BAF) is a new high-load submerged three-phase reactor, and has the advantages of both activated sludge process and Biological membrane process. The single biological aerated filter is regarded as a treatment process unit, so the biological aerated filter can be divided into a pure carbon removal filter, a carbon removal/nitrification/denitrification filter and the like according to the function of the filter. Therefore, the proper combination form can be adopted according to the difference of the operation characteristics and the treatment field of the process to complete the work of carbonization, nitrification, denitrification, phosphorus removal and the like. At present, the biological aerated filter has gradually developed from a single process to a series of comprehensive processes. The biological aerated filter is widely applied to the treatment of high-concentration wastewater such as municipal sewage, residential sewage, domestic miscellaneous wastewater, food processing wastewater, brewing, paper making and the like.
In order to enable the biological aerated filter to have a longer operation period, reduce the backflushing times and reduce the energy consumption, the BAF process is applied to carry out pretreatment on inlet water, otherwise, a large amount of impurities and SS in raw water enter the biological aerated filter, an aeration and water distribution system is blocked, and serious consequences are brought to the operation of the system.
The HWO technology is based on the microbial community survival theory and the antioxidant theory of the head-to-head effect, adopts high-activity microbes HPB, and is mixed with activated sludge in a wastewater treatment pool according to a proportion in the presence of a microbial activator OSSC to continuously activate, preferentially, domesticate and proliferate high-efficiency functional microbial communities which can become the dominant microorganisms in wastewater treatment. The high activity microbial community is continuously and uniformly added into the sewage biochemical treatment tank to become a functional microbial community with the initial effect of the biochemical treatment system, and a complex ecosystem of the microbes in the biochemical treatment tank can be stably controlled. A variety of microorganisms can be neutralized in this system. The HWO highly active microorganism (HPB) and HWO microorganism activator (OSSC) can exhibit high decomposition activity and good cohesiveness, and a significant improvement effect can be obtained particularly with respect to the following problems by using this technique. The HWO technology can successfully improve the physiological activity of microorganisms, decompose and remove the hypertrophic biomembrane, prevent the hypertrophic biomembrane from being generated, promote the high-efficiency operation of a biomembrane method treatment system, ensure the treatment capacity of a sewage treatment facility and achieve the aim of greatly reducing COD and ammonia nitrogen.
The traditional treatment process of the high ammonia nitrogen wastewater at present has the problems of large occupied area, high operation cost, incomplete total nitrogen removal and much excess sludge. The removal of ammonia nitrogen has two paths, namely assimilation, which is realized by utilizing the principle that heterotrophic microorganisms consume certain ammonia nitrogen when consuming organic carbon and synthesizing cells according to a certain proportion. Secondly, nitrification reaction, namely, nitrifying bacteria belonging to autotrophic microorganisms are utilized to convert ammonia nitrogen into nitrate nitrogen, so that the effect of removing the ammonia nitrogen is realized. The capacity of ammonia nitrogen which can be removed by the first assimilation is only within 5 percent of CODcr by taking aerobic microorganisms as an example. When the second nitrification reaction is used for removing ammonia nitrogen, the BOD of water needs to be reduced to a very high level before the nitrification reaction is carried out. Nitrifying bacteria belonging to autotrophic microorganisms are at a disadvantage in competing with heterotrophic microorganisms (microorganisms that treat COD, BOD).
Therefore, in the practical application of the chemical industry, the assimilation is generally used for the treatment of wastewater with high CODcr (BOD) and low ammonia nitrogen: CODcr is less than or equal to 5 percent. The nitration reaction is generally used for treating wastewater with high ammonia nitrogen and low CODcr (BOD), and the ammonia nitrogen: CODcr is more than or equal to 0.2.
A chemical plant mainly produces sodium carbonate and ammonium chloride, CODcr in water quality is 200-300mg/L, ammonia nitrogen is 80-150mg/L, pollutants in wastewater mainly comprise ammonia nitrogen, salt substances are not contained, only ammonia nitrogen, COD and SS are required to be treated, and the method belongs to general biochemical treatment water quality. The original treatment scheme adopts an A/O/A/O process (anaerobic-aerobic tandem anaerobic-aerobic)The occupied area is large, and 10000m is needed2The site provided by the site is only 3500m2And thus cannot meet the processing requirements. And the A/O biological denitrification process can not ensure that the effluent nitrate nitrogen reaches a low enough level, and the denitrification process is still needed subsequently, so the denitrification effect is not ideal enough.
Therefore, a method for treating high ammonia nitrogen wastewater by combining a biomembrane method and a BAF combined process, which has small occupied area and excellent treatment effect on high ammonia nitrogen and low COD wastewater, needs to be developed.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provide a method for treating high ammonia nitrogen wastewater by combining a biomembrane method and a BAF combined process, which has small occupied area and excellent treatment effect on the high ammonia nitrogen low COD wastewater.
The technical scheme of the invention is as follows: a method for treating high ammonia nitrogen wastewater by combining a biomembrane method and a BAF combined process is characterized by comprising the following steps:
(1) pretreatment of
Conveying the wastewater into an adjusting tank through a pipeline, performing homogenizing and uniform quantity and pH adjustment in the adjusting tank, pumping the wastewater into an air floatation device added with PAC flocculant and PAM flocculant through an adjusting tank lifting pump for full coagulation, and removing partial oil stains and suspended matters;
(2) first-stage biochemical treatment
The wastewater with part of oil stains and suspended matters removed enters an aerobic nitrification tank containing HWO high-activity microorganisms and HWO microorganism activators, and ammonia nitrogen in the wastewater is converted into nitrate nitrogen by adopting a three-stage continuous nitrification process; then the wastewater enters a post-denitrification tank, nitrate nitrogen in the wastewater is converted into nitrogen by adopting a two-stage continuous denitrification process, and COD is removed;
(3) secondary biochemical treatment
The wastewater after the first-stage biochemical treatment enters a high-density sedimentation tank with PAC and PAM added at the water inlet end, the water after full sedimentation, concentration and clarification automatically flows into an intermediate water tank after reaching the suspended solid concentration SS which is less than or equal to 60mg/L, then enters a BAF aeration biological filter to remove redundant COD and ammonia nitrogen, the produced water automatically flows into a backwashing water tank, and finally is pumped into a fiber filter by a pump to be discharged after reaching the standard. The CODcr in the water to be treated is 200-300mg/L and the ammonia nitrogen is 80-150mg/L, so the wastewater determines the process design mainly based on the nitration reaction, and the denitrification reaction is another necessary condition of the process design of the invention because the ammonia nitrogen is converted into nitrate nitrogen and the discharge limit value of total nitrogen is lower as the process design mainly based on the nitration reaction is adopted. In the invention, the CODcr does not contain a large amount of non-degradable organic matters, so the priority order of pollutant factors in the process design of the scheme is ammonia nitrogen → nitrate nitrogen (total nitrogen) → CODcr. The preposition or postposition of denitrification is mainly determined according to the actual water quality, and the water quality of the invention is suitable for postposition denitrification.
The scheme introduces a HWO biochemical process (high-activity microorganism and microorganism activation technology) in combination with the experience of wastewater treatment, uses a combined treatment process of biomembrane denitrification and a high-density pond and aeration Biofiltration (BAF) and is applied to industrial high-ammonia nitrogen wastewater treatment. At 400m3In the/h high ammonia nitrogen wastewater treatment device, the HWO biomembrane and BAF combined (high density tank is used for turbidity pretreatment) main process is adopted, so that the ammonia nitrogen and the total nitrogen reach the standard, the system is very stable, the design targets of small occupied area, low treatment cost and extremely small amount of residual sludge are achieved, and the superiority of the process as a high ammonia nitrogen wastewater treatment technology is proved. Can be popularized as a stable, mature and land-saving wastewater treatment process.
The high-density sedimentation tank is generally used as a pretreatment tank (primary sedimentation tank) or a sewage advanced treatment tank in the prior art, and is not used as a secondary sedimentation tank, mainly because the conventional activated sludge method needs the secondary sedimentation tank to have certain sludge concentration, the sludge production amount is large, the sludge needs to flow back, the biological sludge is easy to expand, and the high-density sedimentation tank is not suitable for being used as the secondary sedimentation tank. The scheme adopts a biomembrane method and HWO high-activity microorganisms, so that the generated sludge amount is small, the sludge backflow is not needed, and the field is small, so that the high-density pond is most suitable. Meanwhile, suspended matters in effluent of the conventional secondary sedimentation tank are unstable and sometimes reach more than 100mg/L, the requirement of water inlet of the BAF tank is not met, a flocculation reverse final sedimentation tank (generally an inclined tube sedimentation tank with stirring) needs to be added between the secondary sedimentation tank and the BAF tank in the conventional process, and the scheme adopts the functions of the high-density tank and the flocculation reverse final sedimentation tank to replace the functions of the secondary sedimentation tank and the flocculation reverse final sedimentation tank, so that the field is efficiently saved at the same time.
In the above scheme, preferably, the aerobic nitrification tank and the post-denitrification tank in the step (2) both adopt a fixed biofilm reactor, and a three-dimensional elastic filler is arranged in the fixed biofilm reactor, wherein the three-dimensional elastic filler is polypropylene elastic wires arranged on a nylon central rope. The three-dimensional elastic filler provides a place suitable for living for the nitrifying bacteria and the denitrifying bacteria with slow growth speed, particularly in an anoxic pond, and the filled elastic filler is a good habitat of the denitrifying bacteria with strong poison resistance and strong capability of adapting to adverse environments, so that the three-dimensional elastic filler is very beneficial to the denitrifying effect.
In the above scheme, preferably, an aeration disc is arranged in the post-denitrification tank in the step (2) to add carbon dioxide gas to supplement the inorganic carbon source, and methanol is added to supplement the organic carbon source. This is advantageous in that denitrification can be sufficiently performed.
In the scheme, the residual sludge in the air floatation device, the high-density sedimentation tank and the BAF tank is preferably discharged into a sludge collection tank through a self-flow or screw pump for collection, then the sludge is conveyed to a concentration tank for concentration and then enters a screw stacking machine for dehydration treatment, filter residues are transported outwards, and filtrate is collected through an underground collection tank and then is sent back to a regulating tank. Thereby being beneficial to reducing the discharge of filter residues and the recycling of filtrate.
In the above scheme, the BAF biological aerated filter is preferably backwashed by the effluent of a backwashing water tank. Thereby being beneficial to cleaning and backwashing the BAF biological aerated filter.
In the scheme, the fiber filter is preferably backwashed through the effluent of the middle water tank, sludge obtained through backwashing and sludge collection discharged into the sludge collection tank through a self-flow or screw pump are conveyed to the concentration tank for concentration and then enter the screw stacking machine for dehydration treatment, filter residues are transported outwards, and filtrate is collected through the underground collection tank and then sent back to the regulating tank. Thereby facilitating the cleaning and backwashing of the fiber filter.
Preferably, the pH value in step (1) is adjusted to 7-8.5. Thereby being beneficial to the full proceeding of the subsequent nitrification denitrification.
The invention has the beneficial effects that:
1. the pollutants treated by the method are mainly ammonia nitrogen, and the COD and the BOD in the wastewater are both low. The project adopts a post-denitrification process design, a two-stage membrane denitrification process section is connected after three-stage membrane process nitrification and denitrification to remove total nitrogen, then the total nitrogen enters a high-density sedimentation tank for clarification, and a subsequent BAF tank is used as a secondary biochemical treatment device and has the effects of decarburization and denitrification. By utilizing the characteristic that the three-stage aerobic denitrification process has thorough denitrification, the characteristic that the biomembrane method can fix the microorganisms and the performance advantage of HWO high-activity microorganisms, the effects of saving the most tank volume, reducing power consumption and thoroughly removing ammonia nitrogen are achieved. Therefore, the carbon source added in the denitrification process can be ensured to be cleanly treated at the tail end, ammonia nitrogen can be ensured, and the total nitrogen removal reaches the standard.
2. The aerobic tank and the anoxic tank in the O/A process flow are designed into a fixed biofilm reactor, and a biofilm denitrification system is formed. The system is formed by connecting two sets of relatively independent packed bed reactors in series, wherein one set of packed bed reactors is kept in an anoxic state, and the other set of packed bed reactors is kept in an aerobic state. The filler in the reactor is a three-dimensional elastic filler, and the membrane O/A process can obtain better denitrification effect than that of a specific sludge process, mainly because the carrier provides a suitable living place for the nitrifying bacteria and the denitrifying bacteria with slow growth speed. In particular, in the anoxic pond, the filled elastic filler is a good habitat of denitrifying bacteria with strong poison resistance and strong adaptability to adverse environments, so that the elastic filler is very beneficial to the denitrification effect.
3. The aeration biological filter belongs to a submerged biological filter process, and filter materials in the filter are completely immersed by wastewater. The highest volume load of the submerged biological filter is 3-6 kgBOD/(m)3D) compared with the traditional activated sludge method, under the condition of approximately equal BOD removing efficiency, the method can increase the volume load of BOD by 5 times, and only 1/5 of the activated sludge method is needed for processing time, so that the processing capacity of equipment with the same size and volume is naturally increased by several times due to shortened processing time. The determination shows that the aerobic rate of the biomembrane with filamentous fungi with the same wet weight is 1.8 times higher than that of the activity sludge method. The sludge concentration of the common activated sludge method is 2-5 g/L, and microorganisms are in a poolThe submerged biological filter is in a suspended state, most microorganisms in the submerged biological filter are attached to the filler, the concentration of the microorganisms in water and on the filler in unit volume can reach 10-20 g/L, the concentration of the microorganisms is high, and the volume load is favorably improved. The process does not need sludge backflow, is easy to manage, has good effluent quality and low power consumption, and does not have the problem of blockage caused by biofilm hypertrophy due to the superior performance of HWO microorganisms.
4. The treatment efficiency is high, and the effluent is stable; the sludge amount is small; the system is resistant to impact load, and can recover in a short time (three to five days) when the chlorine radical of the inlet water suddenly exceeds the standard by more than one time, and the system is damaged due to the change of the quality of the inlet water of the sewage, while the conventional activated sludge method needs more than one month.
Drawings
FIG. 1 is a process flow diagram of the present invention
Detailed Description
The following specific examples further illustrate the invention in detail.
The main pollution of the high ammonia nitrogen wastewater to be treated by the invention is as follows: the ammonia nitrogen is less than or equal to 150mg/L, COD and less than or equal to 300mg/L, BOD and less than or equal to 80mg/L, pH and 6-9, the SS is less than or equal to 300mg/L, and the oil is less than or equal to 50mg/L, TN and less than or equal to 150 mg/L.
As shown in figure 1, the method for treating high ammonia nitrogen wastewater by combining a biofilm process with a BAF combined process comprises the following steps:
(1) pretreatment of
The wastewater is conveyed into an adjusting tank by a pipeline, the homogenization and uniform amount and the pH value are adjusted to 7-8.5 in the adjusting tank, and the wastewater also contains overhaul and accident wastewater due to various water supply processes, and a large amount of oil and suspended matters exist in the water, so that the wastewater needs to be pretreated, and then the wastewater is pumped into an air floatation device added with PAC and PAM by an adjusting tank lifting pump to be fully coagulated, and partial oil stain and suspended matters are removed;
(2) first-stage biochemical treatment
The wastewater from which part of oil stains and suspended matters are removed enters an aerobic nitrification tank (the aerobic nitrification tank adopts a fixed biofilm reactor, a three-dimensional elastic filler is arranged in the fixed biofilm reactor, the three-dimensional elastic filler is polypropylene elastic wires arranged on a nylon central rope), the aerobic nitrification tank contains HWO high-activity microorganisms and HWO microorganism activators to form a stable biofilm, and a three-stage continuous nitrification process (three nitrification tanks are connected in series) is adopted to convert ammonia nitrogen in the wastewater into nitrate nitrogen; then the wastewater enters a rear denitrification tank, the rear denitrification tank adopts a fixed biofilm reactor, HWO high-activity microorganisms and HWO microorganism activators are also arranged in the rear denitrification tank, an aeration disc is arranged in the rear denitrification tank, carbon dioxide gas is added to supplement an inorganic carbon source, meanwhile, methanol (substances such as saccharides, grease, organic acid ester and micromolecule alcohol) is added to supplement an organic carbon source, a two-stage continuous denitrification process (two denitrification tanks are connected in series) is adopted to convert nitrate nitrogen in the wastewater into nitrogen, and COD is removed;
(3) secondary biochemical treatment
The wastewater after the first-stage biochemical treatment enters a high-density sedimentation tank of which the water inlet end is added with PAC flocculant (polyaluminium chloride) and PAM flocculant (polyacrylamide), the high-density sedimentation tank is simultaneously used as a sedimentation device of an O/A biochemical tank and a pretreatment device of an aeration biological filter, the water quality reaches the water inlet requirement (the suspended solid concentration SS is not more than 60mg/L) of the aeration biological filter after full sedimentation, concentration and clarification, automatically flows into an intermediate water tank, then enters a BAF aeration biological filter to remove redundant COD and ammonia nitrogen, the produced water automatically flows into a backwashing water tank, and finally is pumped into a fiber filter by a pump to be filtered and then is discharged after reaching the standard.
And residual sludge in the air floatation device, the high-density sedimentation tank and the BAF aeration biological filter tank is discharged into a sludge collection tank through a self-flow or screw pump for collection, then the sludge is conveyed to a concentration tank for concentration and then enters a screw stacking machine for dehydration treatment, filter residues are transported outwards, and filtrate is collected through an underground collection tank and then is sent back to a regulating tank.
In the steps, as the HWO biomembrane method process is used for stably forming the biomembrane, the treated effluent has good quality, the effluent of the system has little floating mud and good settleability, the high-density sedimentation tank has high turbidity removal efficiency which is more than 85 percent, the effluent turbidity is less than 7mg/L, and the higher the influent turbidity is, the higher the removal rate is, the greater the turbidity removal degree of the high-density tank is. It is fully proved that the high-density tank can replace the traditional secondary sedimentation tank and final sedimentation tank under the process condition of the HWO biomembrane method. The BAF biological aerated filter in the system mainly plays a role in stabilizing the quality of the effluent water of the system, fully ensures the qualified index of the effluent water particularly when the ammonia nitrogen of the influent water is high, can completely ensure the impact resistance and the elastic space of the treatment capacity of the whole system as the supplement and the insurance of a biochemical system, and achieves the purpose of design.
When the BAF biological aerated filter needs backwashing and cleaning, backwashing through the effluent of a backwashing water tank; when the fiber filter needs backwashing and cleaning, the sludge obtained by backwashing is discharged into a sludge collection tank through a self-flow or screw pump and collected, then the sludge is conveyed to a concentration tank for concentration and then enters a screw stacking machine for dehydration treatment, filter residues are transported outwards, and filtrate is collected through an underground collection tank and then is sent back to a regulating tank.
The structure of the using device of the invention is as follows: the device comprises an adjusting tank, an air flotation tank provided with an air flotation device, an aerobic nitrification tank, a rear denitrification tank, a high-density sedimentation tank, an intermediate water tank, a BAF biological aerated filter, a backwashing water tank and a fiber filter which are sequentially connected from front to back along the flow direction of wastewater; the sludge positions of the air flotation device, the high-density sedimentation tank and the BAF biological aerated filter are communicated to a sludge collecting tank, the sludge collecting tank is communicated to a concentration tank through a lifting pump, the water outlet position of the concentration tank is communicated to a regulating tank, the sludge outlet position of the concentration tank is communicated to a spiral shell stacking dehydrator, and the water outlet position of the spiral shell stacking dehydrator and the water outlet position of the concentration tank are combined and communicated with the regulating tank. A backwashing pipeline communicated to the BAF biological aerated filter is arranged at the water outlet of the backwashing water tank, and a backwashing pipeline communicated to the fiber filter is arranged at the water outlet of the middle water tank.
The whole set of device of the invention is designed to treat water with the volume of 400m3The ammonia nitrogen concentration is 150 mg/L. The total occupied area of the project is less than 3500m2Biochemical residence time was designed for a total of 22.5h (including high density cell), residence time: the nitrification tank is 14 hours, the denitrification tank is 6.5 hours, the high-density tank is 1.5 hours, the middle water tank is 0.5 hour, only one third of the activated sludge method is adopted, the floor area is also reduced by two thirds, and the whole treatment effect and treatment cost are superior to those of the activated sludge method. The dry sludge subjected to filter pressing per month does not exceed 0.5 ton, and the dry sludge is more than 10 tons per month averagely when the same sewage amount is treated by the activated sludge processCompared with the prior art, the sludge is few and few, the sludge treatment cost is greatly reduced, and the operation burden is also reduced. And the small generation amount of the residual sludge is one of the main technical characteristics of HWO biochemical technology.
The treated effluent quality was compared to the influent quality as shown in Table 1 below.
TABLE 1 Water quality of inlet and outlet water
Item Ammonia nitrogen (mg/L) COD(mg/L) BOD(mg/L) pH SS(mg/L) Oils, their preparation and their use TN(mg/L) Tp(mg/L)
Inflow water ≦150 ≦300 ≦80 6～9 ≦300 ≦50 ≦150 ——
Discharging water ≦15 ≦60 ≦20 6～9 ≦20 ≦3 ≦20 ≦0.5

Claims (5)

1. A method for treating high ammonia nitrogen wastewater by combining a biomembrane method and a BAF combined process is characterized by comprising the following steps:
(1) pretreatment of
Conveying the wastewater into an adjusting tank through a pipeline, performing homogenizing and uniform quantity and pH adjustment in the adjusting tank, pumping the wastewater into an air floatation device added with PAC flocculant and PAM flocculant through an adjusting tank lifting pump for full coagulation, and removing partial oil stains and suspended matters;
(2) first-stage biochemical treatment
The wastewater with part of oil stains and suspended matters removed enters an aerobic nitrification tank containing HWO high-activity microorganisms and HWO microorganism activators, and ammonia nitrogen in the wastewater is converted into nitrate nitrogen by adopting a three-stage continuous nitrification process; then the wastewater enters a post-denitrification tank, nitrate nitrogen in the wastewater is converted into nitrogen by adopting a two-stage continuous denitrification process, COD is removed simultaneously, both the aerobic nitrification tank and the post-denitrification tank adopt fixed biofilm reactors, a three-dimensional elastic filler is arranged in the fixed biofilm reactors, the three-dimensional elastic filler is polypropylene elastic wires arranged on a nylon central rope, an aeration disc is arranged in the post-denitrification tank, carbon dioxide gas is added to supplement an inorganic carbon source, and methanol is added to supplement an organic carbon source;
(3) secondary biochemical treatment
The wastewater after the first-stage biochemical treatment enters a high-density sedimentation tank with PAC and PAM added at the water inlet end, the water after full sedimentation, concentration and clarification automatically flows into an intermediate water tank after reaching the suspended solid concentration SS which is less than or equal to 60mg/L, then enters a BAF aeration biological filter to remove redundant COD and ammonia nitrogen, the produced water automatically flows into a backwashing water tank, and finally is pumped into a fiber filter by a pump to be discharged after reaching the standard.
2. The method for treating high ammonia nitrogen wastewater by combining the biomembrane method and the BAF combined process as claimed in claim 1, wherein the sludge remaining in the air flotation device, the high-density sedimentation tank and the BAF aeration biofilter is discharged into a sludge collection tank through a self-flow or screw pump for collection, then is conveyed to a concentration tank for concentration and then enters a screw stacking machine for dehydration treatment, filter residues are transported outwards, and filtrate is collected through an underground collection tank and then is conveyed back to a regulating tank.
3. The method for treating high ammonia nitrogen wastewater by combining the biomembrane method and the BAF combined process as claimed in claim 1, wherein the BAF biological aerated filter is backwashed by the effluent of a backwashing water tank.
4. The method for treating high ammonia nitrogen wastewater by combining the biomembrane method and the BAF combined process as claimed in claim 1, wherein the fiber filter is backwashed by the effluent of the intermediate water tank, sludge obtained by backwashing and sludge discharged into a sludge collecting tank through a gravity flow or a screw pump are collected, then conveyed into a concentration tank for concentration and then enter a screw stacking machine for dehydration treatment, filter residues are transported outwards, and filtrate is collected by an underground collecting tank and then sent back to a regulating tank.
5. The method for treating high ammonia nitrogen wastewater by combining the biofilm process with the BAF combined process as claimed in claim 1, wherein the pH value in the step (1) is adjusted to 7-8.5.
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