CN113003889A - Environment-friendly treatment method for domestic sewage and preparation method thereof - Google Patents
Environment-friendly treatment method for domestic sewage and preparation method thereof Download PDFInfo
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- CN113003889A CN113003889A CN202110309690.9A CN202110309690A CN113003889A CN 113003889 A CN113003889 A CN 113003889A CN 202110309690 A CN202110309690 A CN 202110309690A CN 113003889 A CN113003889 A CN 113003889A
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- 239000010865 sewage Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title description 3
- 239000010802 sludge Substances 0.000 claims abstract description 35
- 208000003251 Pruritus Diseases 0.000 claims abstract description 23
- 230000007803 itching Effects 0.000 claims abstract description 23
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 21
- 238000004062 sedimentation Methods 0.000 claims abstract description 16
- 239000013049 sediment Substances 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims description 33
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 29
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 29
- 241001330002 Bambuseae Species 0.000 claims description 29
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 29
- 239000011425 bamboo Substances 0.000 claims description 29
- 239000000835 fiber Substances 0.000 claims description 29
- 239000000945 filler Substances 0.000 claims description 23
- 239000006228 supernatant Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 230000018044 dehydration Effects 0.000 claims description 15
- 238000006297 dehydration reaction Methods 0.000 claims description 15
- 239000000706 filtrate Substances 0.000 claims description 15
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 14
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000004917 carbon fiber Substances 0.000 claims description 14
- 239000008394 flocculating agent Substances 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 238000010992 reflux Methods 0.000 claims description 12
- 239000002351 wastewater Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 8
- 239000012141 concentrate Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 238000004659 sterilization and disinfection Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 7
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 7
- 238000013329 compounding Methods 0.000 claims description 7
- 230000000249 desinfective effect Effects 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 235000010413 sodium alginate Nutrition 0.000 claims description 7
- 229940005550 sodium alginate Drugs 0.000 claims description 7
- 239000000661 sodium alginate Substances 0.000 claims description 7
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 7
- 239000006249 magnetic particle Substances 0.000 claims description 6
- 239000012466 permeate Substances 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 230000001954 sterilising effect Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 15
- 230000000149 penetrating effect Effects 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 7
- 229910052698 phosphorus Inorganic materials 0.000 description 7
- 239000011574 phosphorus Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000010840 domestic wastewater Substances 0.000 description 6
- 238000005202 decontamination Methods 0.000 description 4
- 230000003588 decontaminative effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
-
- 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
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses an environment-friendly treatment method of domestic sewage, which comprises the steps of treating a multi-stage septic tank, treating a grating tank, adjusting pH in sections, stabilizing and adjusting a rotational flow grit chamber, treating a reverse osmosis treatment system, deeply treating a multi-stage A/O (anoxic/oxic) tank, removing sludge and sediments in the sedimentation tank, performing reverse osmosis treatment and sterilizing treatment in sequence; the multistage A/O pool comprises an anaerobic pool, a first-stage anoxic pool, a second-stage anoxic pool and an itching relieving pool; the anaerobic tank is a two-stage anaerobic tank which is connected in series and comprises a first-stage anaerobic tank and a second-stage anaerobic tank. The invention has excellent dephosphorization and denitrification effect by adopting the multi-stage A/O tank, and the primary anaerobic tank is arranged in front of the secondary anaerobic tank, so that the dephosphorization and denitrification effect can be obviously improved, and the sewage treatment cost is reduced.
Description
Technical Field
The invention relates to the technical field of domestic sewage treatment, in particular to an environment-friendly domestic sewage treatment method.
Background
At present, along with the urban densification, the population living density is increased, the water resource consumption is increased rapidly, and the total discharge amount of urban domestic sewage is in a trend of rising obviously. The domestic sewage discharged in large quantity contains a large quantity of pollutants such as COD, ammonia nitrogen, total phosphorus and the like, and the normal growth of plants is seriously influenced. China mainly adopts biochemical methods, such as an active sludge method, an oxidation ditch method, an artificial wetland method and the like, aiming at biological sewage treatment methods. The traditional living treatment method of the active sludge can only remove organic pollutants which are dissolved in the sewage, and can only remove the amount of plant nutrient substances such as nitrogen, phosphorus and the like contained in the sewage, which are absorbed due to the physiological needs of bacterial cells. Therefore, most domestic sewage treatment processes have insignificant removal effects on nitrogen, phosphorus and organic matters in sewage, and the content of nitrogen and phosphorus is still overproof.
Chinese patent CN107601789A discloses an integrated domestic sewage treatment method, which comprises the following steps:step one, solid-liquid separation of domestic sewage, separation of large-particle floating matters and sediments and removal of organic pollutants in the domestic sewage; step two, domestic sewage is subjected to two-stage anaerobic treatment, and the air-permeable soil tank purifies the sewage by utilizing the action of soil and microorganisms; constructing a biological nitrification/denitrification microbial environment, and removing ammonia nitrogen in domestic sewage; the iron filings laid in the filler are converted into Fe by corrosion3+And PO with4 3-Reaction to form precipitate FePO4Removing phosphorus in the domestic sewage; the treatment of the air-permeable soil tank reaches the standard and is discharged or infiltrated. In the above-disclosed patent, the conversion into Fe is made by corrosion of iron filings3+And PO with4 3-Reaction to form precipitate FePO4Removing phosphorus from domestic sewage, but Fe with long-term use of sewage treatment3+Will be reduced continuously, and the actual dephosphorization effect is not obvious.
Chinese patent CN104355488A discloses a domestic sewage treatment method, which comprises the following steps: removing slag from the domestic sewage, and filtering to obtain first pretreated domestic sewage; adjusting the pH value of the first pretreated domestic sewage, and standing to obtain second pretreated domestic sewage; adjusting the pH value of the second pretreated domestic sewage, and standing to obtain third pretreated domestic sewage; carrying out anaerobic decontamination treatment on the third pretreated domestic sewage to obtain fourth pretreated domestic sewage; carrying out aerobic decontamination treatment on the fourth pretreated domestic sewage to obtain fifth pretreated domestic sewage; concentrating and standing the fifth pretreated domestic sewage to obtain pretreated bottom mud and pretreated water; and carrying out reverse osmosis treatment on the pretreated water to obtain purified water. In the above-mentioned patent, domestic sewage is subjected to anaerobic decontamination treatment and itching decontamination treatment, but sludge generated in the treatment process is not subjected to dephosphorization treatment, and the treated sewage is not subjected to sterilization and disinfection treatment, so that pathogenic microorganisms exist in the water.
Disclosure of Invention
In view of the above, the present invention provides an environmental protection treatment method for domestic sewage and a preparation method thereof, so as to solve the above technical problems.
The invention provides the following technical scheme:
an environment-friendly treatment method of domestic sewage comprises the following steps:
s1, treating the centrally collected domestic sewage by a multi-stage septic tank, naturally settling, discharging the effluent of the septic tank into a pretreatment stirring well, and scattering solid substances in the sewage treated by the multi-stage septic tank; after treatment in a grating pool, adjusting the pH in sections, naturally settling for 6 hours again, and filtering to remove solid particles and insoluble impurities;
s2, discharging the domestic sewage treated in the step S1 into a rotational flow grit chamber, staying for 10-12 h, then entering a stable adjusting tank, adding a flocculating agent, stirring for 8h, and removing suspended matters by an air floatation method; then the mixture is treated by a reverse osmosis treatment system;
s3, discharging the domestic sewage treated in the step S2 into a multi-stage A/O pool for advanced treatment; then the wastewater enters a sedimentation tank to be filtered to remove sludge and sediment, and the supernatant effluent is subjected to reverse osmosis treatment;
and S4, disinfecting the domestic sewage treated in the step S3 by a sodium hypochlorite contact system and an ultraviolet disinfection system, and then discharging.
Preferably, in S2, the specific method for adjusting pH in stages is: adjusting the pH value to 6-7, and naturally settling for 3 h; adjusting the pH value to 10-11, and naturally settling for 3 h.
Preferably, in S2, the adding ratio of the domestic wastewater treated by the rotational flow grit chamber to the flocculating agent is 1500mL:2 g-5 g.
More preferably, the flocculant is prepared by compounding iron oxide, activated carbon and sodium alginate according to the mass ratio of 10-15: 3-5: 35-55.
Preferably, in S2, permeate and concentrate are obtained by reverse osmosis treatment, the obtained concentrate is returned to the grid pond for treatment, and the permeate is discharged to the multi-stage a/O pond.
Preferably, in S3, the multistage a/O pool includes an anaerobic pool, a primary anoxic pool, a secondary anoxic pool, and an itching relieving pool; the anaerobic tank is a two-stage anaerobic tank which is connected in series and comprises a first-stage anaerobic tank and a second-stage anaerobic tank.
More preferably, effluent after the treatment of the first-stage anoxic tank flows back to the second-stage anaerobic tank for treatment, and the sewage backflow rate is 40-55%; after the itching pool is treated, the effluent flows back to the second-stage anoxic pool for treatment, and the sewage backflow rate is 30-50%.
Preferably, in S3, the supernatant effluent is subjected to reverse osmosis treatment to obtain a permeate and a concentrate, the supernatant is discharged, and the concentrate is returned to the first-stage anoxic tank for treatment.
Preferably, in S3, the sludge in the sedimentation tank enters a mechanical concentration and dehydration all-in-one machine after passing through a sludge collection tank, and a filtrate and a dehydrated sludge cake are obtained after concentration and dehydration; refluxing the filtrate to a first-stage anaerobic tank in the multi-stage A/O tank for dephosphorization treatment; and (5) transporting the dewatered mud cakes outwards.
Preferably, the itching relieving pool is added with a porous ceramic medium and a bamboo fiber biological filler; the porous carbon fiber medium is composed of carbon fibers with the diameter of 30-60 nm and the length of 5-10 mu m; the bamboo fiber biological filler is a modified bamboo fiber magnetic suspension filler which takes modified coarse bamboo fibers as a carrier and takes Fe3O4 magnetized particles as a kernel.
According to the technical scheme, the invention has the beneficial effects that:
(1) the invention adopts the multi-stage A/O tank, has excellent dephosphorization and denitrification effects, and the primary anaerobic tank is arranged in front of the secondary anaerobic tank, so that the dephosphorization and denitrification effects can be obviously improved; the mixed liquid, the concentrated solution and the filtrate generated in the treatment process are continuously refluxed, so that the treatment effect of the domestic sewage can be improved, and the most effective phosphorus removal is realized. In the invention, the concentrated solution obtained by the treatment of the reverse osmosis treatment system flows back to the grating tank and is combined with the primary domestic sewage and continuously contacted, thereby improving the settleability of the sludge and further improving the settleability of the sludge in the sedimentation tank.
(2) The sludge generated in the treatment process of the invention has good stability, can be directly subjected to mechanical dehydration and concentration treatment, does not need digestion treatment, reduces the treatment steps and saves the production cost.
(3) The itching relieving pool is added with the porous ceramic medium and the bamboo fiber biological filler, so that the attachment growth of microorganisms can be increased, the contact chance of the microorganisms and sewage is enhanced, pollutants are effectively removed, the oxygen utilization rate is improved, the aeration quantity is reduced, and the energy consumption is saved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Example 1
Environment-friendly treatment method for domestic sewage
The environment-friendly treatment method of the domestic sewage comprises the following steps:
s1, treating the centrally collected domestic sewage by a multi-stage septic tank, naturally settling, discharging the effluent of the septic tank into a pretreatment stirring well, and scattering solid substances in the sewage treated by the multi-stage septic tank; after treatment in a grating pool, adjusting the pH value to 6, and naturally settling for 3 h; adjusting the pH value to 10, naturally settling for 3h, and filtering to remove solid particles and insoluble impurities;
s2, discharging the domestic sewage treated in the step S1 into a rotational flow grit chamber, staying for 10 hours, then entering a stable adjusting tank, adding a flocculating agent, stirring for 8 hours, and removing suspended matters through an air floatation method; then treating the wastewater by a reverse osmosis treatment system to obtain penetrating fluid and concentrated solution, refluxing the obtained concentrated solution to a grid pool, and discharging water from the penetrating fluid to a multi-stage A/O pool;
s3, discharging the domestic sewage treated in the step S2 into a multi-stage A/O pool for advanced treatment, and sequentially passing through a primary anaerobic pool, a secondary anaerobic pool, a primary anoxic pool, a secondary anoxic pool and an itching relieving pool; effluent after the first-stage anoxic tank treatment flows back to the second-stage anaerobic tank for treatment, and the sewage backflow rate is 40%; after the itching pool is treated, the effluent flows back to the second-stage anoxic pool for treatment, and the sewage backflow rate is 30 percent; then the wastewater enters a sedimentation tank to be filtered to remove sludge and sediment, the effluent of the supernatant is subjected to reverse osmosis treatment to obtain penetrating fluid and concentrated solution, the supernatant is discharged, and the concentrated solution flows back to the first-stage anoxic tank;
and S4, disinfecting the domestic sewage treated in the step S3 by a sodium hypochlorite contact system and an ultraviolet disinfection system, and then discharging.
In the embodiment, in S2, the adding ratio of the domestic wastewater treated by the rotational flow grit chamber to the flocculating agent is 1500mL:2 g; the flocculant is prepared by compounding iron oxide, activated carbon and sodium alginate according to the mass ratio of 10:3: 35.
In this embodiment, in S3, the sludge in the sedimentation tank passes through the sludge collection tank and then enters the mechanical concentration and dehydration integrated machine, and after concentration and dehydration, filtrate and dehydrated sludge cake are obtained; refluxing the filtrate to a first-stage anaerobic tank in the multi-stage A/O tank for dephosphorization treatment; transporting the dewatered mud cake outside; the itching relieving pool is added with a porous ceramic medium and a bamboo fiber biological filler; the porous carbon fiber medium is composed of carbon fibers with the diameter of 30nm and the length of 5 mu m; the bamboo fiber biological filler is prepared by taking modified coarse bamboo fiber as a carrier and Fe3O4The magnetic particle is the modified bamboo fiber magnetic suspension filler of the kernel.
Example 2
Environment-friendly treatment method for domestic sewage
The environment-friendly treatment method of the domestic sewage comprises the following steps:
s1, treating the centrally collected domestic sewage by a multi-stage septic tank, naturally settling, discharging the effluent of the septic tank into a pretreatment stirring well, and scattering solid substances in the sewage treated by the multi-stage septic tank; after treatment in a grating pool, adjusting the pH value to 7, and naturally settling for 3 h; adjusting the pH value to 11, naturally settling for 3h, and filtering to remove solid particles and insoluble impurities;
s2, discharging the domestic sewage treated in the step S1 into a rotational flow grit chamber, staying for 11 hours, then entering a stable adjusting tank, adding a flocculating agent, stirring for 8 hours, and removing suspended matters through an air floatation method; then treating the wastewater by a reverse osmosis treatment system to obtain penetrating fluid and concentrated solution, refluxing the obtained concentrated solution to a grid pool, and discharging water from the penetrating fluid to a multi-stage A/O pool;
s3, discharging the domestic sewage treated in the step S2 into a multi-stage A/O pool for advanced treatment, and sequentially passing through a primary anaerobic pool, a secondary anaerobic pool, a primary anoxic pool, a secondary anoxic pool and an itching relieving pool; effluent after the first-stage anoxic tank treatment flows back to the second-stage anaerobic tank for treatment, and the sewage backflow rate is 45%; after the itching pool is treated, the effluent flows back to the second-stage anoxic pool for treatment, and the sewage backflow rate is 35 percent; then the wastewater enters a sedimentation tank to be filtered to remove sludge and sediment, the effluent of the supernatant is subjected to reverse osmosis treatment to obtain penetrating fluid and concentrated solution, the supernatant is discharged, and the concentrated solution flows back to the first-stage anoxic tank;
and S4, disinfecting the domestic sewage treated in the step S3 by a sodium hypochlorite contact system and an ultraviolet disinfection system, and then discharging.
In the embodiment, in S2, the adding ratio of the domestic wastewater treated by the rotational flow grit chamber to the flocculating agent is 1500mL:2.5 g; the flocculant is prepared by compounding iron oxide, activated carbon and sodium alginate according to the mass ratio of 11:3.5: 38.
In this embodiment, in S3, the sludge in the sedimentation tank passes through the sludge collection tank and then enters the mechanical concentration and dehydration integrated machine, and after concentration and dehydration, filtrate and dehydrated sludge cake are obtained; refluxing the filtrate to a first-stage anaerobic tank in the multi-stage A/O tank for dephosphorization treatment; transporting the dewatered mud cake outside; the itching relieving pool is added with a porous ceramic medium and a bamboo fiber biological filler; the porous carbon fiber medium is composed of carbon fibers with the diameter of 40nm and the length of 6 mu m; the bamboo fiber biological filler is prepared by taking modified coarse bamboo fiber as a carrier and Fe3O4The magnetic particle is the modified bamboo fiber magnetic suspension filler of the kernel.
Example 3
Environment-friendly treatment method for domestic sewage
The environment-friendly treatment method of the domestic sewage comprises the following steps:
s1, treating the centrally collected domestic sewage by a multi-stage septic tank, naturally settling, discharging the effluent of the septic tank into a pretreatment stirring well, and scattering solid substances in the sewage treated by the multi-stage septic tank; after treatment in a grating pool, adjusting the pH value to 7, and naturally settling for 3 h; adjusting the pH value to 10, naturally settling for 3h, and filtering to remove solid particles and insoluble impurities;
s2, discharging the domestic sewage treated in the step S1 into a rotational flow grit chamber, staying for 11 hours, then entering a stable adjusting tank, adding a flocculating agent, stirring for 8 hours, and removing suspended matters through an air floatation method; then treating the wastewater by a reverse osmosis treatment system to obtain penetrating fluid and concentrated solution, refluxing the obtained concentrated solution to a grid pool, and discharging water from the penetrating fluid to a multi-stage A/O pool;
s3, discharging the domestic sewage treated in the step S2 into a multi-stage A/O pool for advanced treatment, and sequentially passing through a primary anaerobic pool, a secondary anaerobic pool, a primary anoxic pool, a secondary anoxic pool and an itching relieving pool; effluent after the first-stage anoxic tank treatment flows back to the second-stage anaerobic tank for treatment, and the sewage backflow rate is 45%; after the itching pool is treated, the effluent flows back to the second-stage anoxic pool for treatment, and the sewage backflow rate is 40 percent; then the wastewater enters a sedimentation tank to be filtered to remove sludge and sediment, the effluent of the supernatant is subjected to reverse osmosis treatment to obtain penetrating fluid and concentrated solution, the supernatant is discharged, and the concentrated solution flows back to the first-stage anoxic tank;
and S4, disinfecting the domestic sewage treated in the step S3 by a sodium hypochlorite contact system and an ultraviolet disinfection system, and then discharging.
In the embodiment, in S2, the adding ratio of the domestic wastewater treated by the rotational flow grit chamber to the flocculating agent is 1500mL:3 g; the flocculant is prepared by compounding iron oxide, activated carbon and sodium alginate according to the mass ratio of 13:4: 40.
In this embodiment, in S3, the sludge in the sedimentation tank passes through the sludge collection tank and then enters the mechanical concentration and dehydration integrated machine, and after concentration and dehydration, filtrate and dehydrated sludge cake are obtained; refluxing the filtrate to a first-stage anaerobic tank in the multi-stage A/O tank for dephosphorization treatment; transporting the dewatered mud cake outside; the itching relieving pool is added with a porous ceramic medium and a bamboo fiber biological filler; the porous carbon fiber medium is composed of carbon fibers with the diameter of 50nm and the length of 7 mu m; the bamboo fiber biological filler is prepared by taking modified coarse bamboo fiber as a carrier and Fe3O4The magnetic particle is the modified bamboo fiber magnetic suspension filler of the kernel.
Example 4
Environment-friendly treatment method for domestic sewage
The environment-friendly treatment method of the domestic sewage comprises the following steps:
s1, treating the centrally collected domestic sewage by a multi-stage septic tank, naturally settling, discharging the effluent of the septic tank into a pretreatment stirring well, and scattering solid substances in the sewage treated by the multi-stage septic tank; after treatment in a grating pool, adjusting the pH value to 6, and naturally settling for 3 h; adjusting the pH value to 11, naturally settling for 3h, and filtering to remove solid particles and insoluble impurities;
s2, discharging the domestic sewage treated in the step S1 into a rotational flow grit chamber, staying for 12 hours, then entering a stable adjusting tank, adding a flocculating agent, stirring for 8 hours, and removing suspended matters through an air floatation method; then treating the wastewater by a reverse osmosis treatment system to obtain penetrating fluid and concentrated solution, refluxing the obtained concentrated solution to a grid pool, and discharging water from the penetrating fluid to a multi-stage A/O pool;
s3, discharging the domestic sewage treated in the step S2 into a multi-stage A/O pool for advanced treatment, and sequentially passing through a primary anaerobic pool, a secondary anaerobic pool, a primary anoxic pool, a secondary anoxic pool and an itching relieving pool; effluent after the first-stage anoxic tank treatment flows back to the second-stage anaerobic tank for treatment, and the sewage backflow rate is 50%; after the itching pool is treated, the effluent flows back to the second-stage anoxic pool for treatment, and the sewage backflow rate is 45 percent; then the wastewater enters a sedimentation tank to be filtered to remove sludge and sediment, the effluent of the supernatant is subjected to reverse osmosis treatment to obtain penetrating fluid and concentrated solution, the supernatant is discharged, and the concentrated solution flows back to the first-stage anoxic tank;
and S4, disinfecting the domestic sewage treated in the step S3 by a sodium hypochlorite contact system and an ultraviolet disinfection system, and then discharging.
In the embodiment, in S2, the adding ratio of the domestic wastewater treated by the rotational flow grit chamber to the flocculating agent is 1500mL:4 g; the flocculant is prepared by compounding iron oxide, activated carbon and sodium alginate according to the mass ratio of 13:4: 50.
In this embodiment, in S3, the sludge in the sedimentation tank passes through the sludge collection tank and then enters the mechanical concentration and dehydration integrated machine, and after concentration and dehydration, filtrate and dehydrated sludge cake are obtained; refluxing the filtrate to a first-stage anaerobic tank in the multi-stage A/O tank for dephosphorization treatment; transporting the dewatered mud cake outside; the itching relieving pool is added with a porous ceramic medium and a bamboo fiber biological filler; the porous carbon fiber medium consists of a porous carbon fiber55nm and 8 mu m long carbon fiber; the bamboo fiber biological filler is prepared by taking modified coarse bamboo fiber as a carrier and Fe3O4The magnetic particle is the modified bamboo fiber magnetic suspension filler of the kernel.
Example 5
Environment-friendly treatment method for domestic sewage
The environment-friendly treatment method of the domestic sewage comprises the following steps:
s1, treating the centrally collected domestic sewage by a multi-stage septic tank, naturally settling, discharging the effluent of the septic tank into a pretreatment stirring well, and scattering solid substances in the sewage treated by the multi-stage septic tank; after treatment in a grating pool, adjusting the pH value to 7, and naturally settling for 3 h; adjusting the pH value to 11, naturally settling for 3h, and filtering to remove solid particles and insoluble impurities;
s2, discharging the domestic sewage treated in the step S1 into a rotational flow grit chamber, staying for 12 hours, then entering a stable adjusting tank, adding a flocculating agent, stirring for 8 hours, and removing suspended matters through an air floatation method; then treating the wastewater by a reverse osmosis treatment system to obtain penetrating fluid and concentrated solution, refluxing the obtained concentrated solution to a grid pool, and discharging water from the penetrating fluid to a multi-stage A/O pool;
s3, discharging the domestic sewage treated in the step S2 into a multi-stage A/O pool for advanced treatment, and sequentially passing through a primary anaerobic pool, a secondary anaerobic pool, a primary anoxic pool, a secondary anoxic pool and an itching relieving pool; effluent after the first-stage anoxic tank treatment flows back to the second-stage anaerobic tank for treatment, and the sewage backflow rate is 55%; after the itching pool is treated, the effluent flows back to the second-stage anoxic pool for treatment, and the sewage backflow rate is 50 percent; then the wastewater enters a sedimentation tank to be filtered to remove sludge and sediment, the effluent of the supernatant is subjected to reverse osmosis treatment to obtain penetrating fluid and concentrated solution, the supernatant is discharged, and the concentrated solution flows back to the first-stage anoxic tank;
and S4, disinfecting the domestic sewage treated in the step S3 by a sodium hypochlorite contact system and an ultraviolet disinfection system, and then discharging.
In the embodiment, in S2, the adding ratio of the domestic wastewater treated by the rotational flow grit chamber to the flocculating agent is 1500mL:5 g; the flocculant is prepared by compounding iron oxide, activated carbon and sodium alginate according to the mass ratio of 15:5: 55.
In this embodiment, in S3, the sludge in the sedimentation tank passes through the sludge collection tank and then enters the mechanical concentration and dehydration integrated machine, and after concentration and dehydration, filtrate and dehydrated sludge cake are obtained; refluxing the filtrate to a first-stage anaerobic tank in the multi-stage A/O tank for dephosphorization treatment; transporting the dewatered mud cake outside; the itching relieving pool is added with a porous ceramic medium and a bamboo fiber biological filler; the porous carbon fiber medium is composed of carbon fibers with the diameter of 60nm and the length of 10 mu m; the bamboo fiber biological filler is prepared by taking modified coarse bamboo fiber as a carrier and Fe3O4The magnetic particle is the modified bamboo fiber magnetic suspension filler of the kernel.
Test examples
The domestic sewage obtained by the environment-friendly treatment methods of the embodiments 1 to 5 is detected according to GB18918-2002, and the following test results are measured as shown in the following table 1:
TABLE 1
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An environment-friendly treatment method of domestic sewage is characterized by comprising the following steps:
s1, treating the centrally collected domestic sewage by a multi-stage septic tank, naturally settling, discharging the effluent of the septic tank into a pretreatment stirring well, and scattering solid substances in the sewage treated by the multi-stage septic tank; after treatment in a grating pool, adjusting the pH in sections, naturally settling for 6 hours again, and filtering to remove solid particles and insoluble impurities;
s2, discharging the domestic sewage treated in the step S1 into a rotational flow grit chamber, staying for 10-12 h, then entering a stable adjusting tank, adding a flocculating agent, stirring for 8h, and removing suspended matters by an air floatation method; then the mixture is treated by a reverse osmosis treatment system;
s3, discharging the domestic sewage treated in the step S2 into a multi-stage A/O pool for advanced treatment; then the wastewater enters a sedimentation tank to be filtered to remove sludge and sediment, and the supernatant effluent is subjected to reverse osmosis treatment;
and S4, disinfecting the domestic sewage treated in the step S3 by a sodium hypochlorite contact system and an ultraviolet disinfection system, and then discharging.
2. The method for environmentally friendly treating domestic sewage according to claim 1, wherein in S1, the specific method for stepwise adjusting pH is as follows: adjusting the pH value to 6-7, and naturally settling for 3 h; adjusting the pH value to 10-11, and naturally settling for 3 h.
3. The environmental protection treatment method of domestic sewage according to claim 1, wherein in S2, the addition ratio of domestic sewage treated by the rotational flow grit chamber to the flocculating agent is 1500mL:2 g-5 g.
4. The environmental-friendly treatment method for domestic sewage treatment according to claim 3, wherein the flocculant is prepared by compounding iron oxide, activated carbon and sodium alginate according to a mass ratio of 10-15: 3-5: 35-55.
5. The method of claim 1, wherein in S2, the treatment system is operated to obtain permeate and concentrate, the concentrate is returned to the grid tank for treatment, and the permeate is discharged to the multi-stage A/O tank.
6. The method for environmentally friendly treating domestic sewage according to claim 1, wherein in S3, the multi-stage a/O tank includes an anaerobic tank, a primary anoxic tank, a secondary anoxic tank, an aerobic tank; the anaerobic tank is a two-stage anaerobic tank which is connected in series and comprises a first-stage anaerobic tank and a second-stage anaerobic tank.
7. The environmental protection treatment method of domestic sewage according to claim 6, wherein the effluent after the first stage anoxic tank treatment flows back to the second stage anaerobic tank for treatment, the sewage backflow rate is 40% -55%; after the itching pool is treated, the effluent flows back to the second-stage anoxic pool for treatment, and the sewage backflow rate is 30-50%.
8. The method according to claim 1, wherein in S3, the effluent of the supernatant is subjected to reverse osmosis to obtain a permeate and a concentrate, the supernatant is discharged, and the concentrate is returned to the first anoxic tank for treatment.
9. The environmental protection treatment method of domestic sewage according to claim 1, wherein in S3, the sludge in the sedimentation tank passes through the sludge collection tank and then enters the mechanical concentration and dehydration integrated machine, and after concentration and dehydration, filtrate and dehydrated sludge cake are obtained; refluxing the filtrate to a first-stage anaerobic tank in the multi-stage A/O tank for dephosphorization treatment; and (5) transporting the dewatered mud cakes outwards.
10. The environmental protection treatment method for domestic sewage according to claim 1, wherein said itching relieving tank is added with porous ceramic medium and bamboo fiber biological filler; the porous carbon fiber medium is composed of carbon fibers with the diameter of 30-60 nm and the length of 5-10 mu m; the bamboo fiber biological filler is prepared by taking modified coarse bamboo fiber as a carrier and Fe3O4The magnetic particle is the modified bamboo fiber magnetic suspension filler of the kernel.
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