CN111268803A - Method for treating low-temperature municipal sewage by using internal phosphorus removal A-MAO activated sludge biofilm process and application - Google Patents
Method for treating low-temperature municipal sewage by using internal phosphorus removal A-MAO activated sludge biofilm process and application Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 75
- 239000010802 sludge Substances 0.000 title claims abstract description 66
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 49
- 239000011574 phosphorus Substances 0.000 title claims abstract description 49
- 239000010865 sewage Substances 0.000 title claims abstract description 34
- 239000000945 filler Substances 0.000 claims abstract description 35
- 238000012856 packing Methods 0.000 claims abstract 5
- 238000010992 reflux Methods 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 15
- 238000004062 sedimentation Methods 0.000 claims description 13
- 238000005273 aeration Methods 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 230000014759 maintenance of location Effects 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 4
- 239000011790 ferrous sulphate Substances 0.000 claims description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 4
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- 230000009191 jumping Effects 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 8
- 238000003672 processing method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 21
- 230000000813 microbial effect Effects 0.000 description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000003814 drug Substances 0.000 description 5
- 239000002068 microbial inoculum Substances 0.000 description 4
- 244000005700 microbiome Species 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 241000108664 Nitrobacteria Species 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
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- 230000001360 synchronised effect Effects 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/10—Temperature conditions for biological treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Water Supply & Treatment (AREA)
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Abstract
The invention belongs to the technical field of low-temperature urban sewage treatment, and relates to a method for treating low-temperature urban sewage by an internal phosphorus removal A-MAO activated sludge biomembrane process and application thereof. The system adopted by the processing method comprises the following steps: the device comprises a pretreatment unit, a nitrogen and phosphorus removal A-MAO unit, a combined packing component, a dosing system and the like, wherein the A-MAO unit is provided with two sections of anoxic/aerobic adjustable zones which are respectively arranged between a first aerobic zone and a second aerobic zone, and between the second anoxic zone and the second aerobic zone. The invention adopts measures of improving the sludge concentration, adding a combined filler component, removing phosphorus in the A-MAO process and the like, and improves the low-temperature nitrogen and phosphorus removal efficiency of the A-MAO process.
Description
Technical Field
The invention belongs to the technical field of low-temperature urban sewage treatment, and relates to a method for treating low-temperature urban sewage by an internal phosphorus removal A-MAO activated sludge biomembrane process and application thereof.
Background
The low temperature is a key reason for restricting the urban sewage treatment in northern areas of China not reaching the standard in winter, most areas of China are cold in winter, the water inlet temperature of a sewage treatment plant is lower, the metabolism activity of microorganisms is slowed down, and the activity of part of microbial enzymes is reduced, so that the adsorption and degradation capability of microorganisms is reduced. The effluent water of the sewage treatment plant in winter is difficult to reach the first grade A discharge standard.
At present, for low-temperature sewage treatment, patent CN201910552948.0 discloses a low-temperature-resistant distributed domestic sewage treatment integrated device and a treatment method thereof, wherein the device shell is insulated and heated by a solar heat collection system. Patent CN201810268814.1 has announced sewage treatment device and technology under severe cold low temperature condition, and this patent adopts solar energy water bath heating system heat supply, utilizes the interior water bath heating of jar body to improve the interior sewage temperature of sewage treatment plant, guarantees that jar internal water temperature satisfies going on smoothly of biochemical reaction. Therefore, the method adopts more methods to increase heat preservation facilities, although the method adopts solar energy as energy, the measure increases the capital cost of the process, and the treatment method is difficult to be applied to large-scale urban sewage treatment plants. The patent CN201910073221.4 discloses a composite microbial inoculum for enhancing the denitrification effect of low-temperature low-carbon-nitrogen-ratio sewage and a preparation method and application thereof, and relates to the composite microbial inoculum for enhancing the denitrification effect of low-temperature low-carbon-nitrogen-ratio sewage and the preparation method and application thereof. Patent CN201910831037.1 discloses a method for improving the effect of multistage A/O treatment of low-temperature municipal sewage, and the method is characterized in that anaerobic ammonia oxidation bacteria extracellular polymers (LB-EPS) are respectively added to a multistage A/O aerobic section and an anaerobic section, so that the formation and replacement of multistage A/O biofilms are promoted, and the treatment capacity of the multistage A/O biofilm on low-temperature municipal sewage is improved. However, the complex microbial inoculum can destroy the ecological balance of the original sewage treatment system, so that the function of the original sewage treatment system is weakened, and the cost of the microbial inoculum is high. Adding suspended filler and synchronous chemical removingPhosphorus integration is an effective and economical method of enhancing low temperature sewage treatment. Patent CN201821918748.X discloses a low-temperature enhanced denitrification sewage treatment system, which utilizes synchronous chemical phosphorus removal and suspended filler to improve low-temperature denitrification performance. This patent employs A2O process, and the coagulation process is set in A2After the O process, the running cost is increased.
The invention patent CN201110340639.0 discloses a method for improving the activity of nitrification function microorganisms in activated sludge by directly adding Fe ions. Although the patent directly adds Fe ions to the aerobic zone to improve the denitrification capability at low temperatures, the dephosphorization characteristics of the process are not shown. Meanwhile, due to the non-biofilm method of the system, the sludge age of nitrifying bacteria is long, and the nitrification is difficult to maintain after the feeding of Fe ions is stopped due to the sludge discharge effect.
Disclosure of Invention
According to the defects of the patent, the invention provides a method for treating low-temperature urban sewage by an A-MAO activated sludge biomembrane process for internal phosphorus removal and application thereof.
Firstly, the method and the application are realized by the following processing systems: an internal phosphorus removal A-MAO activated sludge biomembrane process treatment system comprises the following parts: the wastewater enters the A-MAO unit after being pretreated, the A-MAO unit is sequentially divided into an anaerobic zone, a first anoxic zone, a first aerobic zone, a second anoxic zone, a second aerobic zone and a secondary sedimentation tank, the combined filler component can add fillers into the first aerobic zone and the second aerobic zone, and the dosing system adds a chemical phosphorus removal agent into the second aerobic zone, precipitates through the secondary sedimentation tank and then discharges the chemical phosphorus removal agent.
As a preferred technical solution of the present invention, the pretreatment unit includes: the grating, the aeration grit chamber and the primary settling tank are connected in sequence.
As a preferred technical scheme of the invention, the denitrification and dephosphorization A-MAO unit further comprises: the device comprises a stirring device, an aeration device, a water inlet distribution device, a mixed liquid reflux device and a sludge reflux device; the stirring device is arranged in the anaerobic zone, the first anoxic zone and the second anoxic zone; the aeration devices are arranged in the first aerobic zone and the second aerobic zone; the water inlet distribution device distributes water to the anaerobic zone and the first anoxic zone; two sections of mixed liquor reflux are arranged, the mixed liquor reflux respectively flows back to the first anoxic zone from the first aerobic zone, and the mixed liquor reflux flows back to the second anoxic zone from the second aerobic zone; the sludge reflux device can reflux the sludge in the secondary sedimentation tank to the anaerobic zone.
As a preferable technical scheme of the invention, the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone and the second aerobic zone form up-and-down jumping water flows by forming cavities.
As a preferred technical scheme of the invention, the denitrification and dephosphorization A-MAO unit is provided with two sections of anoxic/aerobic adjustable zones which are respectively arranged between a first aerobic zone and a second aerobic zone, and between the second anoxic zone and the second aerobic zone
The invention further provides a method for treating low-temperature municipal sewage by an internal phosphorus removal A-MAO activated sludge biomembrane process, which adopts the treatment system of the claim and comprises the following steps: the hydraulic retention time is 10-20 h; the dissolved oxygen of the first aerobic zone and the second aerobic zone is controlled to be (1-3) +/-0.5 mg/L, the sludge discharge period is 15-24d, the sludge concentration on the filler is 6000mg/L and the concentration of the free activated sludge maintains 3000mg/L of 2000-.
Under the condition of normal temperature, the hydraulic retention time of the process can be selected to be 10-15 h, the dissolved oxygen is controlled to be 1-2mg/L, the sludge discharge period is 15-16d, a filler component can not be arranged, if the filler component is arranged, the concentration of sludge on the filler is 6000mg/L and the concentration of free activated sludge is 3000mg/L at 2000-. The relevant parameters are the same as most of the processes (such as anaerobic-anoxic-aerobic process, multistage anoxic-aerobic process, inverted anaerobic-anoxic-aerobic process)
Under the condition of low temperature, the hydraulic retention time is increased to 10-20h, the dissolved oxygen of the first aerobic zone and the second aerobic zone is controlled to be (1-3) +/-0.5 mg/L, the sludge discharge period is 15-24d, the sludge concentration on the filler is 6000mg/L in 5000-plus, and the free activated sludge concentration is maintained at 3000mg/L in 2000-plus. Compared with other current sewage treatment process parameters, the hydraulic retention time in the parameters related in the invention is prolonged, the contact time of sewage and activated sludge is increased, and the nitrification effect is improved; the dissolved oxygen is improved, so that the water body temperature and the activity of aerobic microorganisms can be improved, and the nitrification effect is improved; the sludge discharge period is prolonged, the concentration of the activated sludge in the process can be improved, and the removal efficiency of pollutants is increased. The filler is arranged and the concentration of the sludge on the filler is kept at 6000mg/L of 5000-.
As a preferred technical scheme of the invention, the mixed liquid reflux device is provided with two sections of mixed liquid reflux, the mixed liquid reflux respectively flows back to the first anoxic zone from the first aerobic zone, the mixed liquid reflux flows back to the second anoxic zone from the second aerobic zone, and the reflux ratio of the mixed liquid is respectively 50-100% and 150% of 100-; the water inlet distribution device is provided with sectional water inlet, the water inlet point is an anaerobic zone and a second anoxic zone, and the distribution ratio of the water inlet is (4: 6) - (5: 5); the sludge reflux device is used for setting sludge reflux and refluxing the sludge from the secondary sedimentation tank to the anaerobic zone, and the reflux ratio is 50-100%.
Compared with the traditional process in which one-stage mixed liquid reflux is arranged, the method disclosed by the invention has the advantages that the contact time of pollutants and activated sludge is prolonged, and the reaction effect is improved. The arrangement of water inlet distribution can ensure that the two anoxic zones have enough carbon sources for denitrification, thereby avoiding the consumption of the carbon sources at the front end of the process and saving the additional carbon sources.
As a preferred technical scheme of the invention, two sections of anoxic/aerobic adjustable zones are arranged and respectively arranged between a first aerobic zone and a second aerobic zone, and between a second anoxic zone and a second aerobic zone, through the adjustment of the adjustable zones, the volume ratio of an anaerobic zone, a first anoxic zone, a first aerobic zone, a second anoxic zone, a second aerobic zone and an aerobic zone of the A-MAO process at normal temperature is respectively 1: 4: 5: 4: 5, the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone, the second aerobic zone and the aerobic volume ratio at low temperature are respectively 1: 3: 6: 3: 6.
at normal temperature, the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone, the second aerobic zone and the aerobic volume ratio are respectively 1: 4: 5: 4: 5, the temperature can meet the nitrification effect of the aerobic zone, the proportion of the anoxic zone is increased, the denitrification effect of the process is improved, and the total nitrogen concentration of effluent is reduced; when the temperature is low, the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone, the second aerobic zone and the aerobic volume ratio are respectively changed to be 1: 3: 6: 3: 6, because the low-temperature nitrification action is weakened, the volume of the aerobic zone is improved, and the nitrification effect is increased.
As a preferred technical scheme of the invention, the combined filler component consists of combined fillers, the system feeds the fillers to the first aerobic zone and the second aerobic zone, and the filling rate of the suspended fillers is 10-30%; the combined filler consists of fiber bundles, plastic sheets, pipe sleeves and a central rope. The composite filler of the present invention can be obtained commercially.
The filler is arranged and the concentration of the sludge on the filler is kept at 6000mg/L of 5000-.
As a preferred technical scheme of the invention, the agent added by the dosing system is a phosphorus removal agent of ferrous sulfate, polyaluminium chloride and ferric trichloride, the agent is added into a second aerobic zone of the A-MAO process, the adding position is a reaction position which is 10min away from a water outlet of a second aerobic tank, and the adding amount is that the molar ratio of Fe to TP (total phosphorus) is 1.5-3.
The invention adopts the phosphorus removal agents of ferrous sulfate, polyaluminium chloride and ferric trichloride to be added into the second aerobic zone, so that the total phosphorus can react with the phosphorus removal agents and be removed, and the total phosphorus of the effluent reaches the standard. The optimal time for the reaction of the total phosphorus and the medicament is 10min, and the reaction of the phosphorus removal medicament and the sludge can be reduced by selecting the position 10min before the total phosphorus is added to a water outlet, so that the medicament efficiency is improved, and the medicament loss is reduced.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention adopts measures of improving the sludge concentration, adding a combined filler component, removing phosphorus in the A-MAO process and the like, and improves the low-temperature nitrogen and phosphorus removal efficiency of the A-MAO process.
Wherein, the filler is added to lead nitrobacteria to propagate on the filler in a large quantity to form a biomembrane-activated sludge system, thus leading the sludge-aged nitrobacteria and the short-sludge-aged phosphorus-removing bacteria to be separated, and the nitrification under the low-temperature nitrification action is easy to maintain. The adoption of the internal phosphorus removal method can strengthen the processes of microbial degradation and biochemical adsorption: the adoption of the internal phosphorus removal can lead the sludge to have granulation effect through a phosphorus removal medicament, and increase the size of sludge floc. The invention sets the mixed liquid sludge reflux process, can reflux the dephosphorization agent in the aerobic tank to the second anoxic zone, and improves the granulation process of the sludge. And the sludge flows back to the anaerobic zone, and the redundant phosphorus removal agent reacts with the phosphorus in the inlet water to strengthen the biological phosphorus removal.
This interior dephosphorization mode design benefit improves sewage treatment effect in three aspects: (1) the microbial floc forms a thick heat preservation effect, the microbial activity is enhanced, and the degradation efficiency of COD, ammonia nitrogen and total nitrogen is improved; (2) the microbial activity is improved, the secretion of extracellular polymers is promoted, the adsorption effect of sludge is further improved, and more organic matters and nitrogen and phosphorus pollutants are adsorbed; (3) the coagulation effect of the chemical agent and the adsorption effect of the microbial particles are combined to improve the removal effect of the total phosphorus.
Drawings
FIG. 1 is a flow chart of a processing method of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the following examples and the accompanying drawings, but the embodiments of the invention are not limited thereto.
Example 1
Referring to fig. 1, an internal phosphorus removal a-MAO activated sludge biofilm process treatment system includes: the wastewater enters the A-MAO unit after being pretreated, the A-MAO unit is sequentially divided into an anaerobic zone, a first anoxic zone, a first aerobic zone, a second anoxic zone, a second aerobic zone and a secondary sedimentation tank, the combined filler component can add fillers into the first aerobic zone and the second aerobic zone, and the dosing system adds a chemical phosphorus removal agent into the second aerobic zone, precipitates through the secondary sedimentation tank and then discharges the chemical phosphorus removal agent.
The preprocessing unit includes: the grating, the aeration grit chamber and the primary settling tank are connected in sequence.
The denitrification and dephosphorization A-MAO unit also comprises: the device comprises a stirring device, an aeration device, a water inlet distribution device, a mixed liquid reflux device and a sludge reflux device; the stirring device is arranged in the anaerobic zone, the first anoxic zone and the second anoxic zone; the aeration devices are arranged in the first aerobic zone and the second aerobic zone; the water inlet distribution device distributes water to the anaerobic zone and the first anoxic zone; two sections of mixed liquor reflux are arranged, the mixed liquor reflux respectively flows back to the first anoxic zone from the first aerobic zone, and the mixed liquor reflux flows back to the second anoxic zone from the second aerobic zone; the sludge reflux device can reflux the sludge in the secondary sedimentation tank to the anaerobic zone.
Example 2:
the method for treating the low-temperature municipal sewage at 10 ℃ by adopting the A-MAO activated sludge biomembrane process treatment system for internal phosphorus removal in the embodiment 1 and the application thereof are as follows:
the quality of inlet water is that COD is 325mg/L, ammonia nitrogen is 46mg/L, TN is 52mg/L, and TP is 4.8 mg/L.
The A-MAO process is provided with two sections of anoxic/aerobic adjustable zones which are respectively arranged between a first aerobic zone and a second aerobic zone, and between a second anoxic zone and a second aerobic zone, and the volume ratios of the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone, the second aerobic zone and the aerobic zone of the A-MAO process at low temperature are respectively 1: 3: 6: 3: 6.
the total volume of the A-MAO biological nitrogen and phosphorus removal tank is 192L, and the A-MAO biological nitrogen and phosphorus removal tank comprises: the anaerobic zone was 10.2L, the first anoxic zone was 30.3L, the first aerobic zone was 60.6L, the second anoxic zone was 30.3L, and the second aerobic zone was 60.6L.
Wherein, anaerobic zone, first anoxic zone, first aerobic zone, second anoxic zone, second aerobic zone and good oxygen volume ratio are 1 respectively: 3: 6: 3: 6; the hydraulic retention time is 19.2h, the dissolved oxygen in the aerobic zone is controlled to be 3 plus or minus 0.5mg/L, the sludge discharge period is 18d, the sludge concentration on the filler is 5000mg/L, and the concentration of free activated sludge is maintained at 2000 mg/L.
A-MAO biological denitrification and dephosphorization tank is provided with two stages of mixed liquor reflux, the mixed liquor reflux respectively flows from a first aerobic zone to a first anoxic zone, the mixed liquor reflux respectively flows from a second aerobic zone to a second anoxic zone, and the reflux ratio of the mixed liquor is respectively 50% and 150%. The water inlet sets up the segmentation and intakes, and the point of intaking is anaerobic zone and second anoxic zone, and the distribution ratio of intaking is at 4: 6; and setting sludge backflow from the secondary sedimentation tank to the anaerobic zone, wherein the backflow ratio is 80%.
The filler system is composed of fiber bundles, plastic sheets, pipe sleeves and central rope combined fillers, the filler system feeds the fillers to the first aerobic zone and the second aerobic zone of the multi-stage AO process, and the filling rate of the suspended fillers is 30%. And the phosphorus removal agent adding system adopts ferrous sulfate as a phosphorus removal agent and adds the phosphorus removal agent into a second aerobic zone of the A-MAO process, the adding position is a reaction position which is 10min away from a water outlet of a second aerobic tank, and the adding amount is that the Fe/TP molar ratio is 3.
The low-temperature municipal sewage at 10 ℃ is treated by the A-MAO activated sludge biomembrane process with internal phosphorus removal, the COD of the effluent is 19mg/L, the ammonia nitrogen is 0.5mg/L, the TN is 10.5mg/L, and the TP is 0.25 mg/L.
Comparative example 1
The method for treating the municipal sewage with the low temperature of 0 ℃ by adopting the traditional anaerobic-anoxic-aerobic process is compared with the method for treating the municipal sewage with the low temperature of 10 ℃ by adopting the A-MAO activated sludge biomembrane process treatment system for internal phosphorus removal in the example 1 and the application:
the quality of inlet water is that COD is 335mg/L, ammonia nitrogen is 51mg/L, TN is 57mg/L, and TP is 4.5 mg/L.
The anaerobic-anoxic-aerobic process used for comparison is characterized in that the volume ratio of the anaerobic zone to the anoxic zone to the aerobic zone is respectively 1: 3: 6.
the total volume of the anaerobic-anoxic-aerobic process used for comparison is 192L, and comprises the following steps: the anaerobic zone was 19.2L, the first anoxic zone was 57.6L, and the first aerobic zone was 115.2L.
Wherein the hydraulic retention time is 19.2h, the dissolved oxygen in the aerobic zone is controlled to be 3 plus or minus 0.5mg/L, the sludge discharge period is 18d, and the concentration of free activated sludge is maintained at 3000 mg/L.
Mixed liquor backflow is set, the mixed liquor backflow flows from the aerobic zone to the anoxic zone, and the backflow ratio is respectively 200%. And setting sludge backflow from the secondary sedimentation tank to the anaerobic zone, wherein the backflow ratio is 80%.
The low-temperature municipal sewage at 10 ℃ is treated by the traditional anaerobic-anoxic-aerobic process, the COD of the effluent is 28mg/L, the ammonia nitrogen is 7.8mg/L, TN is 19.6mg/L, and TP is 2.4 mg/L.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. An internal phosphorus removal A-MAO activated sludge biomembrane process treatment system is characterized by comprising the following parts: the wastewater enters the A-MAO unit after being pretreated, the A-MAO unit is sequentially divided into an anaerobic zone, a first anoxic zone, a first aerobic zone, a second anoxic zone, a second aerobic zone and a secondary sedimentation tank, the combined filler component can add fillers into the first aerobic zone and the second aerobic zone, and the dosing system adds a chemical phosphorus removal agent into the second aerobic zone, precipitates through the secondary sedimentation tank and then discharges the chemical phosphorus removal agent.
2. The processing system of claim 1, wherein the pre-processing unit comprises: the grating, the aeration grit chamber and the primary settling tank are connected in sequence.
3. The treatment system of claim 1, wherein the denitrification and dephosphorization a-MAO unit further comprises: the device comprises a stirring device, an aeration device, a water inlet distribution device, a mixed liquid reflux device and a sludge reflux device; the stirring device is arranged in the anaerobic zone, the first anoxic zone and the second anoxic zone; the aeration devices are arranged in the first aerobic zone and the second aerobic zone; the water inlet distribution device distributes water to the anaerobic zone and the first anoxic zone; two sections of mixed liquor reflux are arranged, the mixed liquor reflux respectively flows back to the first anoxic zone from the first aerobic zone, and the mixed liquor reflux flows back to the second anoxic zone from the second aerobic zone; the sludge reflux device can reflux the sludge in the secondary sedimentation tank to the anaerobic zone.
4. The treatment system of claim 1, wherein the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone and the second aerobic zone form an up-and-down jumping water flow by forming a hollow.
5. The treatment system of claim 1, wherein the denitrification and dephosphorization A-MAO unit is provided with two anoxic/aerobic adjustable zones, respectively between the first aerobic zone and the second aerobic zone, and between the second anoxic zone and the second aerobic zone.
6. A method for treating low-temperature municipal sewage by an internal phosphorus removal A-MAO activated sludge biofilm process, which is characterized in that the treatment system of any one of claims 1 to 5 is adopted, and the treatment method comprises the following steps: the hydraulic retention time is 10-20 h; the dissolved oxygen of the first aerobic zone and the second aerobic zone is controlled to be (1-3) +/-0.5 mg/L, the sludge discharge period is 15-24d, the sludge concentration on the filler is 6000mg/L and the concentration of the free activated sludge maintains 3000mg/L of 2000-.
7. The method as claimed in claim 6, wherein the mixed liquid reflux device is provided with two stages of mixed liquid reflux, the mixed liquid reflux flows from the first aerobic zone to the first anoxic zone, the mixed liquid reflux flows from the second aerobic zone to the second anoxic zone, and the mixed liquid reflux ratio is 50-100% and 100-150%; the water inlet distribution device is provided with sectional water inlet, the water inlet point is an anaerobic zone and a second anoxic zone, and the distribution ratio of the water inlet is (4: 6) - (5: 5); the sludge reflux device is used for setting sludge reflux and refluxing the sludge from the secondary sedimentation tank to the anaerobic zone, and the reflux ratio is 50-100%.
8. The method as claimed in claim 6, wherein two adjustable anoxic/aerobic zones are provided, respectively between the first aerobic zone and the second aerobic zone, and between the second anoxic zone and the second aerobic zone, whereby the volume ratio of the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone, the second aerobic zone and the aerobic zone of the A-MAO process at room temperature is 1: 4: 5: 4: 5, the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone, the second aerobic zone and the aerobic volume ratio at low temperature are respectively 1: 3: 6: 3: 6.
9. the method as claimed in claim 6, wherein the combined packing assembly is composed of flexible combined packing, and the system feeds the packing to the first aerobic zone and the second aerobic zone, wherein the packing filling rate is 10-30%; the combined filler consists of fiber bundles, plastic sheets, pipe sleeves and a central rope.
10. The method as claimed in claim 6, wherein the agent added by the agent-adding system is a phosphorus removal agent of ferrous sulfate, polyaluminium chloride and ferric trichloride, the agent is added into the second aerobic zone of the A-MAO process, the adding position is a reaction time position which is 10min away from the water outlet of the second aerobic tank, and the adding amount is that the molar ratio of Fe/TP (total phosphorus) is 1.5-3.
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| CN111995053A (en) * | 2020-08-24 | 2020-11-27 | 哈尔滨工业大学 | A/A/O system based on synchronous reinforced biochemical phosphorus removal of powdered lanthanum-based adsorbent |
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