CN112321067A - Sewage treatment method - Google Patents
Sewage treatment method Download PDFInfo
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- CN112321067A CN112321067A CN202011096072.2A CN202011096072A CN112321067A CN 112321067 A CN112321067 A CN 112321067A CN 202011096072 A CN202011096072 A CN 202011096072A CN 112321067 A CN112321067 A CN 112321067A
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- 239000010865 sewage Substances 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 46
- 238000005189 flocculation Methods 0.000 claims abstract description 16
- 230000016615 flocculation Effects 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 13
- 150000002500 ions Chemical class 0.000 claims abstract description 9
- 238000001556 precipitation Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 238000001914 filtration Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 15
- 239000010802 sludge Substances 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 9
- 238000004062 sedimentation Methods 0.000 claims description 9
- 238000005842 biochemical reaction Methods 0.000 claims description 8
- 238000001179 sorption measurement Methods 0.000 claims description 8
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 239000003463 adsorbent Substances 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 6
- -1 cerium ions Chemical class 0.000 claims description 6
- 239000003344 environmental pollutant Substances 0.000 claims description 5
- 231100000719 pollutant Toxicity 0.000 claims description 5
- 206010021143 Hypoxia Diseases 0.000 claims description 4
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 3
- JYLNVJYYQQXNEK-UHFFFAOYSA-N 3-amino-2-(4-chlorophenyl)-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(CN)C1=CC=C(Cl)C=C1 JYLNVJYYQQXNEK-UHFFFAOYSA-N 0.000 claims description 3
- IRLPACMLTUPBCL-KQYNXXCUSA-N 5'-adenylyl sulfate Chemical compound C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](COP(O)(=O)OS(O)(=O)=O)[C@@H](O)[C@H]1O IRLPACMLTUPBCL-KQYNXXCUSA-N 0.000 claims description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 3
- 241000894006 Bacteria Species 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052684 Cerium Inorganic materials 0.000 claims description 3
- 229920001661 Chitosan Polymers 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 238000005276 aerator Methods 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000003729 cation exchange resin Substances 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 239000000084 colloidal system Substances 0.000 claims description 3
- 238000005188 flotation Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 229940093474 manganese carbonate Drugs 0.000 claims description 3
- 235000006748 manganese carbonate Nutrition 0.000 claims description 3
- 239000011656 manganese carbonate Substances 0.000 claims description 3
- 229910001437 manganese ion Inorganic materials 0.000 claims description 3
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 claims description 3
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 claims description 3
- 229910021645 metal ion Inorganic materials 0.000 claims description 3
- 230000000813 microbial effect Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000008213 purified water Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000001954 sterilising effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims description 3
- 230000000593 degrading effect Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 9
- 239000005416 organic matter Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000002574 poison Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003568 thioethers Chemical class 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
-
- 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
- C02F1/5281—Installations for water purification using chemical 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
- C02F1/66—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
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal 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
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- 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
-
- 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
-
- 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
- C02F3/30—Aerobic and anaerobic processes
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
Abstract
The invention relates to the technical field of sewage treatment, and discloses a sewage treatment method, which comprises the following steps: 1) sewage pretreatment, 2) softening treatment, 3) flocculation treatment, 4) heavy metal removal treatment, 5) heavy metal content detection, 6) biochemical treatment, 7) organic matter content detection, 8) secondary precipitation treatment and 9) disinfection treatment. According to the sewage treatment method, insoluble substances in sewage are sequentially removed through the steps of 1) sewage pretreatment, 2) softening treatment and 3) flocculation treatment, then heavy metal ions in the sewage are removed through the step 4) heavy metal removal treatment, BOD and COD contents in the sewage are reduced through the step 3) flocculation treatment, and organic matters in the sewage are degraded through the step 6) biochemical treatment, so that the problems that the existing industrial sewage mainly adopts a biological matched physical and chemical treatment method, but the treatment method is complex and the cost is high are solved.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage treatment method.
Background
Sewage treatment: the biochemical treatment method is a sewage treatment method which mixes and contacts waste water or solid waste with microorganisms, decomposes organic matters and certain inorganic poisons (such as cyanides, sulfides and the like) in the waste water by utilizing biochemical action in the microorganisms and converts unstable organic matters and inorganic poisons into nontoxic substances.
The industrial sewage is characterized by complex water quality components, high suspended matters and turbidity, high salt content, high chemical oxygen demand and various heavy metals, and the existing industrial sewage mainly adopts a biological treatment method matched with a physical treatment method and a chemical treatment method, but has the problems of complex treatment method, high cost and the like, so the sewage treatment method is provided to solve the problems.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a sewage treatment method, which has the advantages of good organic pollutant degradation effect and high heavy metal recovery rate, and solves the problems that the existing industrial sewage mainly adopts a biological treatment method matched with a physical and chemical treatment method, but still has a complex treatment method and higher cost.
(II) technical scheme
In order to achieve the purposes of good degradation effect of the organic pollutants and high recovery rate of heavy metals, the invention provides the following technical scheme:
a sewage treatment method comprises the following steps:
1) pretreatment of sewage: firstly, sewage is input into a coarse grid filtering device to remove large-particle impurities in the sewage, then the filtered sewage is conveyed to a fine grid device from the coarse grid filtering device through a water pump, the fine grid device is used for filtering small-particle impurities in the sewage, the filtered sewage enters an oil-water separator, impurities, floating oil and suspended matters are removed, and pretreated sewage is obtained;
2) softening treatment: conveying the pretreated sewage in the step 1) into an adjusting tank, adding a proper amount of acid and alkali, stirring and mixing, removing calcium, magnesium and other hardness ions to soften a water body, simultaneously reacting to generate suspended floc particles, testing the pH value of the sewage in real time by using a pH monitor, and stopping adding the acid and alkali when the result measured by the pH monitor is within a set range to obtain softened sewage;
3) flocculation treatment: inputting the softened sewage in the step 2) into a flocculation tank, adding a cationic flocculant into the flocculation tank according to 0.2-0.4 kg per ton of water, and removing grease, colloid and suspended solids in the sewage and suspended floc particles generated in the step 2) through an air flotation machine to obtain primary filtered sewage;
4) heavy metal removal treatment: inputting the primary filtered sewage in the step 3) into a heavy metal adsorption device, adsorbing particle residues and heavy metal ion residues in the sewage by using an adsorbent, and then inputting the adsorbed sewage into a removal device to remove metal ions with high heavy metal content;
5) and (3) heavy metal content detection: carrying out heavy metal content detection on the sewage treated in the step 4), and if the detection does not reach the standard, pumping the sewage back into the heavy metal adsorption device in the step 4) through a water pump for secondary treatment;
6) biochemical treatment: inputting the sewage with the detected heavy metal content reaching the standard in the step 5) into a biochemical reaction tank, and degrading organic matters in the sewage by using microbial bacteria cultured in the biochemical reaction tank to reduce the concentration of pollutants in the sewage;
7) and (3) detecting the content of organic matters: sampling the sewage treated in the step 6) and detecting the sewage by a COD detector;
8) secondary precipitation treatment: inputting the sewage reaching the COD detection standard in the step 7) into a radial flow type secondary sedimentation tank for secondary sedimentation, and filtering to obtain clear water;
9) and (3) disinfection treatment: inputting the clarified water obtained in the step 8) into a disinfection tank, and carrying out disinfection and sterilization treatment on the clarified water through ultraviolet ozone to obtain purified water.
Preferably, the setting range of the PH monitor in step 2) is 8-11, and the adsorbent in step 4) includes macroporous cation exchange resin, titanium chloride, manganese carbonate, sodium permanganate, trivalent cerium ions, divalent manganese ions, trivalent titanium ions, chitosan, acrylic acid solution, AMPS solution, acrylamide, acrylic acid, MBA, and potassium persulfate.
Preferably, biochemical treatment pond comprises anaerobism pond, oxygen deficiency pond and aerobic tank in step 6), the oxygen deficiency pond communicates anaerobism pond and aerobic tank respectively, heavy metal content detects up to standard sewage input anaerobism pond in step 5), the top fixed mounting in aerobic tank has the air-blower, the output of air-blower stretches into to the bottom of the pool in aerobic tank, fixed mounting has the micropore aerator in the aerobic tank, the top fixed mounting in biochemical treatment pond has the cover that keeps warm.
Preferably, the filtering device in the step 8) is a belt dehydrator, the radial flow type secondary sedimentation tank is communicated with a sludge concentration tank through a sludge pump, and the sludge concentration tank is communicated with the belt dehydrator through the sludge pump.
(III) advantageous effects
Compared with the prior art, the invention provides a sewage treatment method, which has the following beneficial effects:
1. according to the sewage treatment method, insoluble substances in the sewage are sequentially removed through the step 1) sewage pretreatment, the step 2) softening treatment and the step 3) flocculation treatment, then heavy metal ions in the sewage are removed through the step 4) heavy metal removal treatment, the loss of directly removing the heavy metals from the sewage is reduced, the service lives of a heavy metal adsorption device and a heavy metal removal device are prolonged, the maintenance cost of equipment is reduced, and the purpose of high heavy metal recovery rate is achieved.
2. This sewage treatment method can reduce BOD and COD content in the sewage through step 3) flocculation treatment, can degrade the organic matter in the sewage through step 6) biochemical treatment, reduces the concentration of pollutant in the sewage, can keep warm to the biochemical reaction pond through setting up the cover that keeps warm, prevents that the temperature is low excessively and influence the efficiency of reaction to reached the effectual purpose of organic pollutant degradation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A sewage treatment method comprises the following steps:
1) pretreatment of sewage: firstly, sewage is input into a coarse grid filtering device to remove large-particle impurities in the sewage, then the filtered sewage is conveyed to a fine grid device from the coarse grid filtering device through a water pump, the fine grid device is used for filtering small-particle impurities in the sewage, the filtered sewage enters an oil-water separator, impurities, floating oil and suspended matters are removed, and pretreated sewage is obtained;
2) softening treatment: conveying the pretreated sewage in the step 1) into an adjusting tank, adding a proper amount of acid and alkali, stirring and mixing, removing calcium, magnesium and other hardness ions to soften a water body, simultaneously reacting to generate suspended floc particles, testing the pH value of the sewage in real time by using a pH monitor, and stopping adding the acid and alkali when the measured result of the pH monitor is within 8-11 to obtain softened sewage;
3) flocculation treatment: inputting the softened sewage in the step 2) into a flocculation tank, adding a cationic flocculant into the flocculation tank according to 0.2-0.4 kg per ton of water, and removing grease, colloid and suspended solids in the sewage and suspended floc particles generated in the step 2) through an air flotation machine to obtain primary filtered sewage;
4) heavy metal removal treatment: inputting the primary filtered sewage in the step 3) into a heavy metal adsorption device, adsorbing particle residues and heavy metal ion residues in the sewage by using an adsorbent, then inputting the adsorbed sewage into a removal device, and removing metal ions with high heavy metal content, wherein the adsorbent comprises macroporous cation exchange resin, titanium chloride, manganese carbonate, sodium permanganate, trivalent cerium ions, divalent manganese ions, trivalent titanium ions, chitosan, an acrylic acid solution, an AMPS solution, acrylamide, acrylic acid, MBA and potassium persulfate;
5) and (3) heavy metal content detection: carrying out heavy metal content detection on the sewage treated in the step 4), and if the detection does not reach the standard, pumping the sewage back into the heavy metal adsorption device in the step 4) through a water pump for secondary treatment;
6) biochemical treatment: inputting the sewage with the heavy metal content reaching the standard in the step 5) into a biochemical reaction tank, wherein the biochemical treatment tank consists of an anaerobic tank, an anoxic tank and an aerobic tank, the anoxic tank is respectively communicated with the anaerobic tank and the aerobic tank, the sewage with the heavy metal content reaching the standard in the step 5) is input into the anaerobic tank, the top of the aerobic tank is fixedly provided with an air blower, the output end of the air blower extends into the bottom of the aerobic tank, a microporous aerator is fixedly arranged in the aerobic tank, the top of the biochemical treatment tank is fixedly provided with a heat-insulating cover, and the organic matters in the sewage are degraded by microbial bacteria cultured in the biochemical reaction tank, so that the concentration of pollutants in the sewage is reduced;
7) and (3) detecting the content of organic matters: sampling the sewage treated in the step 6) and detecting the sewage by a COD detector;
8) secondary precipitation treatment: inputting the sewage reaching the COD detection standard in the step 7) into a radial flow type secondary sedimentation tank for secondary sedimentation, and filtering to obtain clear water, wherein a filtering device is a belt type dehydrator, the radial flow type secondary sedimentation tank is communicated with a sludge concentration tank through a sludge pump, and the sludge concentration tank is communicated with the belt type dehydrator through the sludge pump;
9) and (3) disinfection treatment: inputting the clarified water obtained in the step 8) into a disinfection tank, and carrying out disinfection and sterilization treatment on the clarified water through ultraviolet ozone to obtain purified water.
The invention has the beneficial effects that: the method comprises the steps of 1) sewage pretreatment, 2) softening treatment and 3) flocculation treatment, wherein insoluble substances in the sewage are sequentially removed, then heavy metal ions in the sewage are removed through 4) heavy metal removal treatment, the loss of directly removing the heavy metals from the sewage is reduced, the service lives of a heavy metal adsorption device and a heavy metal removal device are prolonged, the maintenance cost of equipment is reduced, the aim of high recovery rate of the heavy metals is fulfilled, BOD and COD content in the sewage can be reduced through 3) flocculation treatment, organic matters in the sewage can be degraded through 6) biochemical treatment, the concentration of pollutants in the sewage is reduced, the biochemical reaction tank can be insulated through arranging an insulation cover, the effect of reaction caused by too low temperature is prevented, and the aim of good degradation effect of the organic pollutants is fulfilled, thereby solving the problems that the prior industrial sewage mainly adopts biological treatment method combined with physical and chemical treatment method, but the treatment method is complex and the cost is higher.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A sewage treatment method is characterized by comprising the following steps:
1) pretreatment of sewage: firstly, sewage is input into a coarse grid filtering device to remove large-particle impurities in the sewage, then the filtered sewage is conveyed to a fine grid device from the coarse grid filtering device through a water pump, the fine grid device is used for filtering small-particle impurities in the sewage, the filtered sewage enters an oil-water separator, impurities, floating oil and suspended matters are removed, and pretreated sewage is obtained;
2) softening treatment: conveying the pretreated sewage in the step 1) into an adjusting tank, adding a proper amount of acid and alkali, stirring and mixing, removing calcium, magnesium and other hardness ions to soften a water body, simultaneously reacting to generate suspended floc particles, testing the pH value of the sewage in real time by using a pH monitor, and stopping adding the acid and alkali when the result measured by the pH monitor is within a set range to obtain softened sewage;
3) flocculation treatment: inputting the softened sewage in the step 2) into a flocculation tank, adding a cationic flocculant into the flocculation tank according to 0.2-0.4 kg per ton of water, and removing grease, colloid and suspended solids in the sewage and suspended floc particles generated in the step 2) through an air flotation machine to obtain primary filtered sewage;
4) heavy metal removal treatment: inputting the primary filtered sewage in the step 3) into a heavy metal adsorption device, adsorbing particle residues and heavy metal ion residues in the sewage by using an adsorbent, and then inputting the adsorbed sewage into a removal device to remove metal ions with high heavy metal content;
5) and (3) heavy metal content detection: carrying out heavy metal content detection on the sewage treated in the step 4), and if the detection does not reach the standard, pumping the sewage back into the heavy metal adsorption device in the step 4) through a water pump for secondary treatment;
6) biochemical treatment: inputting the sewage with the detected heavy metal content reaching the standard in the step 5) into a biochemical reaction tank, and degrading organic matters in the sewage by using microbial bacteria cultured in the biochemical reaction tank to reduce the concentration of pollutants in the sewage;
7) and (3) detecting the content of organic matters: sampling the sewage treated in the step 6) and detecting the sewage by a COD detector;
8) secondary precipitation treatment: inputting the sewage reaching the COD detection standard in the step 7) into a radial flow type secondary sedimentation tank for secondary sedimentation, and filtering to obtain clear water;
9) and (3) disinfection treatment: inputting the clarified water obtained in the step 8) into a disinfection tank, and carrying out disinfection and sterilization treatment on the clarified water through ultraviolet ozone to obtain purified water.
2. The method of sewage treatment according to claim 1, wherein: the setting range of the pH monitor in the step 2) is 8-11, and the adsorbent in the step 4) comprises macroporous cation exchange resin, titanium chloride, manganese carbonate, sodium permanganate, trivalent cerium ions, divalent manganese ions, trivalent titanium ions, chitosan, an acrylic acid solution, an AMPS solution, acrylamide, acrylic acid, MBA and potassium persulfate.
3. The method of sewage treatment according to claim 1, wherein: the biochemical treatment pond comprises anaerobism pond, oxygen deficiency pond and aerobic tank in step 6), the oxygen deficiency pond communicates anaerobism pond and aerobic tank respectively, the sewage input anaerobism pond up to standard of heavy metal content detection in step 5), the top fixed mounting of aerobic tank has the air-blower, the output of air-blower stretches into to the bottom of the pool in aerobic tank, fixed mounting has micropore aerator in the aerobic tank, the top fixed mounting in biochemical treatment pond has the cover that keeps warm.
4. The method of sewage treatment according to claim 1, wherein: the filtering device in the step 8) is a belt type dehydrator, the radial flow type secondary sedimentation tank is communicated with a sludge concentration tank through a sludge pump, and the sludge concentration tank is communicated with the belt type dehydrator through the sludge pump.
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