CN115504626A - Sewage treatment process - Google Patents
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- CN115504626A CN115504626A CN202211113334.0A CN202211113334A CN115504626A CN 115504626 A CN115504626 A CN 115504626A CN 202211113334 A CN202211113334 A CN 202211113334A CN 115504626 A CN115504626 A CN 115504626A
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- 239000010865 sewage Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 title claims abstract description 24
- 239000010802 sludge Substances 0.000 claims abstract description 27
- 239000012528 membrane Substances 0.000 claims abstract description 22
- 238000005189 flocculation Methods 0.000 claims abstract description 20
- 230000016615 flocculation Effects 0.000 claims abstract description 20
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 14
- 238000004062 sedimentation Methods 0.000 claims abstract description 13
- 238000009297 electrocoagulation Methods 0.000 claims abstract description 12
- 230000001954 sterilising effect Effects 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000012258 culturing Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 21
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 17
- 229910052760 oxygen Inorganic materials 0.000 claims description 17
- 239000001301 oxygen Substances 0.000 claims description 17
- 239000011574 phosphorus Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 14
- 230000014759 maintenance of location Effects 0.000 claims description 14
- 238000005273 aeration Methods 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000008394 flocculating agent Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000012136 culture method Methods 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 4
- 235000015097 nutrients Nutrition 0.000 claims description 4
- 238000011001 backwashing Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 abstract description 16
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 208000035473 Communicable disease Diseases 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
Images
Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- 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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a sewage treatment process which is characterized by comprising the following steps: the method comprises the following steps: introducing the sewage into a primary sedimentation tank for pretreatment; step two: discharging the pretreated sewage into an electric flocculation device for electrolysis; step three: introducing the sewage subjected to the electrocoagulation treatment into an anoxic tank for reaction; step four: introducing the sewage treated by the anoxic tank into an aerobic tank for culturing activated sludge; step five: introducing the sewage treated by the aerobic tank into an MBR membrane module for MBR treatment; step six: and (4) carrying out ultraviolet sterilization on the sewage treated by the MBR. In the invention, the wastewater is subjected to electric flocculation and anoxic-aerobic treatment, most pollutants are removed, finally, the wastewater is further treated by adopting an MBR membrane separation technology with high treatment efficiency and without generation of concentrated solution, and meanwhile, an aerobic tank is combined with MBR membrane separation, so that the occupied area is further reduced and the operation efficiency is improved.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a sewage treatment process.
Background
Along with the economic development of China, the living standard of people is continuously improved, the sewage discharge amount is increased year by year, water resources are seriously polluted, the ecological environment is continuously deteriorated, and the survival of people is directly threatened. The sewage treatment is an important component of environmental protection, and various treatment technologies need to be flexibly adopted when the sewage is treated, so that the difficulty is high. In addition, the development of the industry leads to the increase of the types of the sewage, the overall complexity is improved, the concentrations of ammonia, nitrogen and phosphorus in the sewage are high, and even heavy metals with high concentration exist in some sewage, which puts higher requirements on the sewage treatment technology. Meanwhile, bacteria and the like in the domestic sewage can propagate in a large quantity, and even can cause the spread of infectious diseases.
The prior process flow of sewage treatment sequentially comprises four steps of sewage mixing, denitrification, organic matter degradation and sludge treatment, the problem that the sewage purified by the method still has the overproof chemical oxygen demand, ammonia nitrogen, total phosphorus, total nitrogen and suspended matters is still solved, and the purification effect of sewage treatment is poor.
Aiming at the current water environment problem, a sewage treatment process is developed, the contents of COD, ammonia, nitrogen, phosphorus and the like in domestic sewage are mainly reduced, the peculiar smell of a water body is eliminated, sterilization and disinfection are carried out, and the water quality of the water body is improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a sewage treatment process.
The purpose of the invention is realized by adopting the following technical scheme:
a sewage treatment process comprises the following steps:
the method comprises the following steps: introducing the sewage into a primary sedimentation tank for pretreatment;
step two: discharging the pretreated sewage into an electric flocculation device for electrolysis;
step three: introducing the sewage subjected to the electrocoagulation treatment into an anoxic tank for reaction;
step four: introducing the sewage treated by the anoxic tank into an aerobic tank for culturing activated sludge;
step five: introducing the sewage treated by the aerobic tank into an MBR membrane module for MBR treatment;
step six: and (4) carrying out ultraviolet sterilization on the sewage treated by the MBR.
Preferably, in the first step, after the sewage is introduced into the primary sedimentation tank, a flocculant is added for flocculation and sedimentation, wherein the flocculant comprises PAM and/or PAC.
Preferably, the electrocoagulation device in the second step is a tubular electrocoagulation reactor, the current range of the electrocoagulation reactor is 12-24A, the residence time is 3h, and the electrocoagulation reactor is provided with 1 48V adjustable voltage-stabilized power supply and 1 lift pump.
Preferably, the specification of the electric flocculation reactor is 2.4 multiplied by 0.8 multiplied by 1.4m, the water inflow rate is set to be 50L/h, the current is 24A, the voltage is 48V, and the hydraulic retention time is 3h.
Preferably, after the sewage is introduced into the anoxic tank in the third step, the retention time of the sewage in the anoxic tank is 8 hours, the dissolved oxygen concentration is less than 0.8mg/L, and 1 lift pump is matched.
Preferably, the aerobic treatment of the sewage in the fourth step and the MBR treatment process in the fifth step are carried out in the same reactor, and the concentration of dissolved oxygen in an aerobic tank is 2.6-3mg/L.
Preferably, the activated sludge culture method in the fourth step adopts a mode of combining full-load continuous culture and intermittent culture, the indexes of dissolved oxygen, COD, ammonia nitrogen and total phosphorus are detected once every 3 days, the proportion of C, N and P in the biochemical pool is analyzed according to the detected indexes, and nutrient substances are added according to the ratio of C to N to P = 100; when the culture time reaches 14 days, observing the biological phase, measuring SV30, observing indexes of COD, ammonia nitrogen and total phosphorus, wherein the activated sludge has a stable structure, and after the effluent quality is good, the activated sludge is mature, and the initial culture and domestication of the activated sludge are basically finished;
wherein SV30 refers to the volume percentage of the sludge after the mixed liquor in the aeration tank is static and settled for 30 min.
Preferably, 1 air compressor, 1 sludge reflux pump and 1 MBR backwashing pump are arranged in the fourth step.
Preferably, in the fifth step, the specification of the MBR membrane tank is 1.33 × 0.74 × 2.25m, the dissolved oxygen concentration of the aerobic tank is kept at 2.8mg/L, the aeration amount is 16L/min, the area of a single membrane is 6m & lt 2 & gt, two branches are combined, the membrane flux is 10L/(m & lt 2 & gt & h), and the hydraulic retention time is 33h.
Preferably, the ultraviolet sterilization of the sewage in the sixth step is performed in an ultraviolet disinfection channel, 2 modules of 32 ultraviolet lamps of 40W are configured, and a guide plate is arranged and is provided with one air compressor.
The beneficial effects of the invention are as follows:
1. the invention combines the pollutant characteristics of the wastewater, comprehensively considers the aspects of wastewater treatment requirements, investment cost, operating cost and the like, and the tubular electric flocculation has the advantages of thorough treatment, simple process, small occupied area and the like for treating surface wastewater.
2. Because the wastewater contains higher organic matters, ammonia nitrogen and phosphate, an anoxic-aerobic technology can be adopted, and the anoxic-aerobic technology has good dephosphorization effect on the basis of removing pollutants.
3. In the invention, the wastewater is subjected to electric flocculation and anoxic-aerobic treatment, most pollutants are removed, finally, the wastewater is further treated by adopting an MBR membrane separation technology with high treatment efficiency and without generation of concentrated solution, and meanwhile, an aerobic tank is combined with MBR membrane separation, so that the occupied area is further reduced and the operation efficiency is improved.
4. The invention further purifies and disinfects the waste water by the ultraviolet sterilization and disinfection technology.
5. In the experimental detection of the sewage treated by the invention, the obtained effects are as follows: the average COD removal rate is 81 percent, and the highest removal rate is 84 percent; the average ammonia nitrogen removal rate is 92%, and the highest removal rate is 96%; the average total phosphorus removal was 80.6% and the maximum total phosphorus removal was 87%.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a flow chart of a sewage treatment process in example 1 of the present invention;
FIG. 2 is a schematic view of a tubular electroflocculation apparatus according to example 1 of the present invention;
fig. 3 is a schematic view of an MBR membrane filtration apparatus in example 1 of the present invention.
Detailed Description
For the purpose of more clearly illustrating the present invention and more clearly understanding the technical features, objects and advantages of the present invention, the technical solutions of the present invention will now be described in detail below, but the present invention should not be construed as being limited to the implementable scope of the present invention.
The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.
The invention is further described with reference to the following examples.
Example 1
A wastewater treatment process, as shown in fig. 1, comprising the steps of:
the method comprises the following steps: introducing the sewage into a primary sedimentation tank for pretreatment; wherein, after the sewage is introduced into the primary sedimentation tank, a flocculating agent is added for flocculation and sedimentation, and the flocculating agent comprises PAM and/or PAC.
Step two: discharging the pretreated sewage into an electric flocculation device for electrolysis; wherein the electric flocculation device is a tubular electric flocculation reactor (shown in figure 2), the current range is 12-24A, the retention time is 3h, and the electric flocculation device is provided with 1 adjustable regulated power supply of 48V and 1 lift pump; the specification of the electric flocculation reactor is 2.4 multiplied by 0.8 multiplied by 1.4m, the water inflow is set to be 50L/h, the current is 24A, the voltage is 48V, and the hydraulic retention time is 3h.
Step three: introducing the sewage subjected to the electrocoagulation treatment into an anoxic tank for reaction; after the sewage is introduced into the anoxic tank, the retention time of the sewage in the anoxic tank is 8 hours, the dissolved oxygen concentration is less than 0.8mg/L, and 1 lifting pump is matched;
step four: introducing the sewage treated by the anoxic tank into an aerobic tank for culturing activated sludge; wherein the concentration of dissolved oxygen in the aerobic tank is 2.6-3mg/L; the activated sludge culture method adopts a mode of combining full-load continuous culture and intermittent culture, detects indexes of dissolved oxygen, COD, ammonia nitrogen and total phosphorus once every 3 days, analyzes the proportion of C, N and P in a biochemical pool according to the detected indexes, and adds nutrient substances according to the requirements of C: N: P = 100; when the culture time reaches 14 days, observing the biological phase, measuring SV30 (SV 30 refers to the volume percentage of sludge after the mixed solution in the aeration tank is static in a measuring cylinder and is settled for 30 min), observing indexes of COD, ammonia nitrogen and total phosphorus, wherein the activated sludge has a stable structure, and after the effluent quality is good, the activated sludge is mature, and the initial culture and domestication of the activated sludge are basically completed; the device is provided with 1 air compressor, 1 sludge reflux pump and 1 MBR backwashing pump.
Step five: introducing the sewage treated by the aerobic tank into an MBR (membrane bioreactor) membrane module (shown in figure 3) for MBR treatment; wherein, MBR treatment and activated sludge culture are carried out in the same reactor, the specification of an MBR membrane pool is 1.33 multiplied by 0.74 multiplied by 2.25m, the dissolved oxygen concentration of an aerobic pool is kept at 2.8mg/L, the aeration rate is 16L/min, the area of a single membrane is 6m & lt 2 & gt, two membranes are totally divided, the membrane flux is 10L/(m & lt 2 & gt h), and the hydraulic retention time is 33h.
Step six: performing ultraviolet sterilization on the sewage treated by the MBR; wherein, the ultraviolet sterilization of sewage is carried out in an ultraviolet disinfection canal, 2 modules of 32 ultraviolet lamps of 40W are arranged, and a guide plate is arranged and is provided with an air compressor.
Example 2
A sewage (metal surface wastewater) treatment process comprises the following steps:
firstly, feeding the metal surface wastewater into a primary sedimentation tank from a water collecting tank through a lifting pump, and performing flocculation sedimentation on at least one of flocculating agents such as PAM (polyacrylamide), PAC (polyaluminium chloride) and the like;
secondly, the wastewater precipitated by the primary sedimentation tank enters a tubular electric flocculation reactor under the action of a lifting pump, the specification of the electric flocculation reactor is 2.4 multiplied by 0.8 multiplied by 1.4m, the set inflow rate is 50L/h, the current is 24A, the voltage is 48V, and the hydraulic retention time is 3h.
Thirdly, performing culture on the activated sludge, wherein the culture method adopts full-load continuous culture and intermittent culture, detects indexes (dissolved oxygen, COD, ammonia nitrogen and total phosphorus) once every 3 days, analyzes the proportion of C, N and P in the biochemical pool according to the detected indexes, and adds nutrient substances as required according to the ratio of C to N to P = 100. The aeration amount is maintained at a high level at the initial stage of the culture, and the aeration amount is adjusted according to the value of dissolved oxygen after 7 days of the culture. According to past experience, when the culture time reaches 14 days, the biological phase is observed, indexes such as SV30, COD, ammonia nitrogen, total phosphorus and the like are measured, the structure of the activated sludge is stable, after the effluent quality is good, the activated sludge is considered to be mature, and the initial culture and domestication of the activated sludge are basically completed.
Fourthly, the wastewater after the electric flocculation enters an anoxic pond under the action of a lift pump, the dissolved oxygen concentration of the wastewater is less than 0.8mg/L, and the hydraulic retention time is 8 hours.
Fifthly, the wastewater after the anaerobic reaction enters an aerobic/MBR reactor under the action of a lift pump, the specification of an MBR membrane tank is 1.33 multiplied by 0.74 multiplied by 2.25m, the dissolved oxygen concentration of the aerobic tank is kept at 2.8mg/L, the aeration amount is 16L/min, and the area of a single membrane is 6m 2 Two branches in total, the membrane flux is 10L/(m) 2 H), hydraulic retention time 33h.
And sixthly, the wastewater treated by the aerobic/MBR enters an ultraviolet disinfection channel for ultraviolet sterilization under the action of a lift pump.
The wastewater treated in example 2 was tested, and the results were as follows:
during the continuous operation of the process, the average inlet water COD concentration is 204mg/L, the average outlet water COD concentration is 36mg/L, the outlet water COD concentration values are all lower than the design value by 50mg/L, the average COD removal rate is 81 percent, and the highest removal rate is 84 percent; the average ammonia nitrogen concentration of inlet water is 6.04mg/L, the average ammonia nitrogen concentration of outlet water is 0.449mg/L, the average ammonia nitrogen removal rate is 92%, and the highest removal rate is 96%; the average total phosphorus concentration of inlet water is 0.695mg/L, the average total phosphorus concentration of outlet water is 0.138mg/L, the average total phosphorus removal rate is 80.6%, and the highest total phosphorus removal rate is 87%.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A sewage treatment process is characterized by comprising the following steps:
the method comprises the following steps: introducing the sewage into a primary sedimentation tank for pretreatment;
step two: discharging the pretreated sewage into an electric flocculation device for electrolysis;
step three: introducing the sewage subjected to the electrocoagulation treatment into an anoxic tank for reaction;
step four: introducing the sewage treated by the anoxic tank into an aerobic tank for culturing activated sludge;
step five: introducing the sewage treated by the aerobic tank into an MBR membrane module for MBR treatment;
step six: and (4) carrying out ultraviolet sterilization on the sewage treated by the MBR.
2. The sewage treatment process of claim 1, wherein in the first step, after the sewage is introduced into the primary sedimentation tank, a flocculating agent is added for flocculation and sedimentation, and the flocculating agent comprises PAM and/or PAC.
3. The sewage treatment process according to claim 1, wherein the electrocoagulation device in the second step is a tubular electrocoagulation reactor, the current range of the electrocoagulation reactor is 12-24A, the retention time is 3h, and the electrocoagulation reactor is provided with 1 48V adjustable stabilized voltage power supply and 1 lift pump.
4. The sewage treatment process of claim 3, wherein the specification of the electric flocculation reactor is 2.4 x 0.8 x 1.4m, the water inflow rate is set to be 50L/h, the current is 24A, the voltage is 48V, and the hydraulic retention time is 3h.
5. The sewage treatment process according to claim 1, wherein in the third step, after the sewage is introduced into the anoxic tank, the retention time of the sewage in the anoxic tank is 8h, the dissolved oxygen concentration is less than 0.8mg/L, and 1 lift pump is provided.
6. The sewage treatment process of claim 1, wherein the aerobic treatment of the sewage in the fourth step and the MBR treatment in the fifth step are carried out in the same reactor, and the concentration of the dissolved oxygen in the aerobic tank is 2.6-3mg/L.
7. The sewage treatment process according to claim 1, wherein the activated sludge culture method in the fourth step adopts a combined mode of full-load continuous culture and intermittent culture, the indexes of dissolved oxygen, COD, ammonia nitrogen and total phosphorus are detected once every 3 days, the proportion of C, N and P in the biochemical pool is analyzed according to the detected indexes, and nutrient substances are added according to the ratio of C: N: P = 100; when the culture time reaches 14 days, observing the biological phases, measuring SV30, observing indexes of COD, ammonia nitrogen and total phosphorus, wherein the activated sludge has a stable structure, and after the effluent quality is good, the activated sludge is mature, and the initial culture and domestication of the activated sludge are basically completed.
8. The sewage treatment process according to claim 1, wherein in the fourth step, 1 air compressor, 1 sludge reflux pump and 1 MBR backwashing pump are arranged.
9. The wastewater treatment process of claim 1, wherein in the fifth step, the MBR membrane tank has a specification of 1.33 x 0.74 x 2.25m, the dissolved oxygen concentration of the aerobic tank is kept at 2.8mg/L, the aeration rate is 16L/min, the area of a single branch membrane is 6m2, the total number of the two branches is two, the membrane flux is 10L/(m 2. H), and the hydraulic retention time is 33h.
10. The sewage treatment process according to claim 1, wherein the ultraviolet sterilization of the sewage in the sixth step is performed in an ultraviolet disinfection ditch, 2 modules of 32 ultraviolet lamps with 40W are arranged, and a guide plate is arranged and is provided with one air compressor.
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| CN202211113334.0A CN115504626A (en) | 2022-09-14 | 2022-09-14 | Sewage treatment process |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101560040A (en) * | 2009-05-08 | 2009-10-21 | 北京清大国华环保科技有限公司 | Method and device for processing pharmaceutical wastewater by pulse electrocoagulation-MBR |
| CN111302560A (en) * | 2019-11-12 | 2020-06-19 | 焦作煤业（集团）冯营电力有限责任公司 | Power plant sewage treatment method based on activated sludge process |
| CN113003866A (en) * | 2021-03-03 | 2021-06-22 | 江西绿建环保科技有限公司 | AO + facultative MBR membrane integral type sewage treatment device |
| CN114084998A (en) * | 2021-10-26 | 2022-02-25 | 长沙工研院环保有限公司 | Rubbish transfer station waste water and domestic sewage cooperative processing system |
| CN114940560A (en) * | 2022-05-05 | 2022-08-26 | 中创宏远（北京）环保科技有限公司 | Electric flocculation air-flotation sewage treatment process of upflow activated sludge-biofilm system |
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