CN114685004A - Biochemical treatment system and method for sulfur-containing printing and dyeing wastewater - Google Patents
Biochemical treatment system and method for sulfur-containing printing and dyeing wastewater Download PDFInfo
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- CN114685004A CN114685004A CN202011642077.0A CN202011642077A CN114685004A CN 114685004 A CN114685004 A CN 114685004A CN 202011642077 A CN202011642077 A CN 202011642077A CN 114685004 A CN114685004 A CN 114685004A
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 42
- 239000011593 sulfur Substances 0.000 title claims abstract description 42
- 239000002351 wastewater Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004043 dyeing Methods 0.000 title claims abstract description 24
- 238000007639 printing Methods 0.000 title claims abstract description 24
- 239000000945 filler Substances 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000004062 sedimentation Methods 0.000 claims abstract description 28
- 239000010802 sludge Substances 0.000 claims abstract description 25
- 238000005273 aeration Methods 0.000 claims abstract description 20
- 238000009826 distribution Methods 0.000 claims abstract description 20
- 238000005276 aerator Methods 0.000 claims abstract description 17
- 241000894006 Bacteria Species 0.000 claims abstract description 12
- 230000001651 autotrophic effect Effects 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims description 17
- 229920002748 Basalt fiber Polymers 0.000 claims description 10
- 230000014759 maintenance of location Effects 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 5
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 13
- 239000000543 intermediate Substances 0.000 description 12
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 150000004763 sulfides Chemical class 0.000 description 6
- 238000000576 coating method Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 125000001477 organic nitrogen group Chemical group 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 2
- 230000003851 biochemical process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 229920001661 Chitosan Polymers 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 241001453382 Nitrosomonadales Species 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- WOWHHFRSBJGXCM-UHFFFAOYSA-M cetyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)C WOWHHFRSBJGXCM-UHFFFAOYSA-M 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000001664 diethylamino group Chemical group [H]C([H])([H])C([H])([H])N(*)C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000037353 metabolic pathway Effects 0.000 description 1
- 230000007269 microbial metabolism Effects 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
Images
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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
- C02F1/52—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
- 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
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
-
- 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
- C02F2209/16—Total nitrogen (tkN-N)
-
- 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
- C02F2303/06—Sludge reduction, e.g. by lysis
-
- 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
- C02F3/10—Packings; Fillings; Grids
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/109—Characterized by the shape
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/345—Biological treatment of water, waste water, or sewage characterised by the microorganisms used for biological oxidation or reduction of sulfur compounds
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a biochemical treatment system and method of sulfur-containing printing and dyeing wastewater, which comprises an aerobic tank, an intermediate sedimentation tank and an anaerobic tank which are connected in sequence, wherein the aerobic tank is in an open container structure, an aeration channel is arranged in the middle of the aerobic tank, an aerator is arranged at the bottom of the aeration channel, an aerobic tank water distribution pipe is paved at the bottom of the aerobic tank, aerobic filler is filled in the middle of the aerobic tank, the anaerobic tank is in a closed container structure, an anaerobic tank water distribution pipe is paved at the bottom of the anaerobic tank, anaerobic filler is filled in the middle of the anaerobic tank, a water outlet pipe at the top of the aerobic tank is connected with the intermediate sedimentation tank, a sludge return pipe connected with the aerobic tank is arranged at the bottom of the intermediate sedimentation tank, and a water outlet pipe of the intermediate sedimentation tank is connected with the anaerobic tank through the anaerobic tank water distribution pipe. Establishing a synchronous high-efficiency nitrogen and sulfur removal method based on sulfur autotrophic denitrifying bacteria.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a biochemical treatment system and method for sulfur-containing printing and dyeing wastewater.
Background
The printing and dyeing wastewater is industrial wastewater which is extremely difficult to treat, has complex water quality components and contains various pollutants such as organic matters, sulfides, nitrates, ammonia nitrogen and the like. Aiming at sulfur-containing printing and dyeing wastewater, the prior art mostly adopts a physicochemical and biochemical combined process as a main part, and the sulfur removal means mainly comprises ferrous precipitation, aeration or oxidant oxidation and other methods, and then is combined with a biochemical process for denitrification treatment. The mode of adding medicine and removing sulfur in a physicochemical mode has the problems of high cost of the medicine, large mud production and the like, and the biochemical process combining the physicochemical technology and the biochemical technology has the problems of long process, large occupied area and the like.
Among them, biochemical methods are widely recognized as metabolic pathways for nitrogen removal mainly including nitrification and denitrification processes. The denitrification reaction refers to the process that nitrate nitrogen and nitrite nitrogen are reduced into gaseous nitrogen under the action of denitrifying bacteria. Traditionally, denitrifying bacteria are heterotrophic bacteria that utilize nitrate or nitrite as an electron acceptor and organic matter as an electron donor to provide energy simultaneously in environments with low dissolved oxygen. Therefore, in the existing mature biochemical denitrification treatment process, in the process of treating most of actual sewage and wastewater with low carbon-nitrogen ratio, a large amount of necessary carbon sources (such as organic matters as glucose, methanol, alcohol and the like) are added to meet the requirement of stable operation effect of the process, which becomes a conventional means and will increase the operation cost of the sewage and wastewater treatment process. In view of the above problems, the concept of replacing the traditional denitrification process with the autotrophic denitrification technology has attracted much attention once being provided. Autotrophic denitrification means that autotrophic denitrifying bacteria (certain chemoautotrophic microorganisms) utilize inorganic carbon (CO2, HCO 3-, CO32-) as a carbon source, mainly use inorganic substances (S, S2-, H2, S2O32-, Fe2+, NH4+, and the like) as electron donors for reducing nitrate nitrogen to complete microbial metabolism, and reduce NO 3-N in water polluted by nitrate nitrogen lacking organic carbon sources to N2. Sulfur autotrophic denitrification is a high-frequency research hotspot, and the main advantages of the sulfur autotrophic denitrification comprise that residual organic matters cannot be generated; no additional organic carbon source is needed; the sludge yield and the risk of effluent biological pollution are reduced.
Therefore, for sulfur-containing printing and dyeing wastewater, a biochemical treatment method with high efficiency, simple process and low cost is needed.
Disclosure of Invention
Technical problem to be solved
In order to overcome the defects of the prior art, the biochemical treatment system and method for the sulfur-containing printing and dyeing wastewater are provided, the MBF filler and the anaerobic reactor are combined in a strengthening way, and a synchronous high-efficiency nitrogen and sulfur removal method based on sulfur autotrophic denitrifying bacteria is established for effectively aiming at sulfur compounds, nitrogen compounds and a small amount of organic matters which are difficult to treat in the wastewater.
(II) technical scheme
The invention is realized by the following technical scheme: the invention provides a biochemical treatment system for sulfur-containing printing and dyeing wastewater, which comprises an aerobic tank, a middle sedimentation tank and an anaerobic tank which are connected in sequence, wherein the aerobic tank is of an open container structure, an aeration channel is arranged in the middle of the aerobic tank, an aerator is arranged at the bottom of the aeration channel, an aerobic tank water distribution pipe is laid at the bottom of the aerobic tank, aerobic filler is filled in the middle of the aerobic tank, the anaerobic tank is of a closed container structure, an anaerobic tank water distribution pipe is laid at the bottom of the anaerobic tank, anaerobic filler is filled in the middle of the anaerobic tank, a water outlet pipe at the top of the aerobic tank is connected with the middle sedimentation tank, a sludge return pipe connected with the aerobic tank is arranged at the bottom of the middle sedimentation tank, and a water outlet pipe of the middle sedimentation tank is connected with the anaerobic tank through the anaerobic tank water distribution pipe.
Furthermore, the aeration channel is formed by two baffle plates connected with the aerobic tank, and the bottoms of the baffle plates and the bottom of the aerobic tank are arranged at intervals.
Furthermore, the baffle is fixed by one of welding, buckling or support.
Further, the aerator is one of a spiral-flow aerator, a microporous aeration disc or a tubular microporous aerator.
Furthermore, the aerobic filler and the anaerobic filler are both suspended by using a support, the fillers are all modified basalt fiber fillers, the diameter of a single fiber bundle is 10-25 cm, the thickness of the single fiber bundle is 2-6 cm, the distance between the fiber bundle and the fiber bundle on the same filler is 7-10 cm, the fiber bundles on two adjacent fillers are in staggered connection layout, and no direct current channel exists.
A method for treating sulfur-containing printing and dyeing wastewater by a biochemical treatment system of sulfur-containing printing and dyeing wastewater comprises the following steps: 1) pumping pretreated sulfur-containing wastewater into an aerobic tank, mixing the sulfur-containing wastewater with sludge in the tank through an aerobic tank water distribution pipe at the bottom, allowing mixed liquor to rise to the top from an aeration channel and flow around through aerobic filler by airflow generated by an aerator to form internal circulating flow, wherein the concentration of free sludge in the aerobic tank is kept at 1-3 g/L, the concentration of dissolved oxygen is kept at 0.5-1.0 mg/L, and the effective hydraulic retention time is 4-8 h; 2) the effluent of the aerobic tank enters an intermediate sedimentation tank, after solid-liquid separation, supernatant enters an anaerobic tank, part of bottom concentrated sludge flows back to the aerobic tank, and part of bottom concentrated sludge is discharged outside for disposal, the effective retention time of the intermediate sedimentation tank is 1-3 h, and the sludge reflux ratio is controlled at 20-40%; 3) the effluent of the intermediate sedimentation tank enters the bottom of an anaerobic tank and enters an anaerobic filler region through a water distribution pipe of the anaerobic tank, the wastewater gradually rises under the action of the inlet water power and is closely contacted with the anaerobic filler, and the gas generated in the anaerobic tank is discharged from the top end; residual sludge at the bottom of the anaerobic tank is periodically cleaned and discharged according to actual conditions, the effective hydraulic retention time in the anaerobic tank is 4-6 hours, anaerobic fillers are closely arranged, and a direct-current channel is avoided.
Furthermore, the anaerobic filler comprises a biological nest domesticated based on the basalt fiber filler, and sulfur autotrophic denitrifying bacteria and anaerobic ammonium oxidation bacteria are enriched inside the biological nest.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
(1) the aerobic tank can stably remove ammonia nitrogen, organic nitrogen and part of toxic sulfides in water, the ammonia nitrogen and the organic nitrogen are converted into nitrate nitrogen (NO 3-N) and nitrite nitrogen (NO 2-N), the toxic sulfides (S2-) are converted into sulfur product intermediates (S, S2O32-), and under the condition of lacking organic carbon sources and without supply, favorable conditions are provided for the autotrophic denitrification process in the anaerobic tank, and low-cost and high-efficiency denitrification and sulfur removal are realized.
(2) Basalt fiber fillers arranged in the aerobic tank and the anaerobic tank effectively increase fixed biomass in each reaction tank, reduce loss of functional flora and reduce impact load of the sedimentation tank under the condition of ensuring the total amount of activated sludge; the fiber bundles on the filler are in staggered connection layout without a direct-current channel, wastewater penetrates through the biological nest to flow, the contact area and time of the wastewater and the biological nest are effectively increased, the treatment efficiency of pollutants is improved, suspended solids in water are effectively intercepted, and the SS standard of the effluent of the reaction tank is ensured.
(3) The anaerobic tank adopts a biological nest of the dominant flora of the sulfur autotrophic denitrifying bacteria based on the modified basalt fiber filler, has large biomass and high biological activity, performs targeted removal on the characteristic pollutants of the sulfur-containing printing and dyeing wastewater, realizes non-medicament, sludge reduction and low-cost high-efficiency treatment, can completely replace physicochemical modes (strong oxidant oxidation, coagulating sedimentation and the like), and effectively solves the problems of high medicament cost, large sludge yield, complex process and the like.
Drawings
FIG. 1 is a schematic diagram of the present invention.
1-an aerobic tank; 2-an intermediate sedimentation tank; 3-an anaerobic tank; 4-aeration channel; 5-a baffle plate; 6-an aerator; 7-water distribution pipe of the aerobic tank; 8-filling the aerobic tank; 9-water distribution pipe of anaerobic tank; 10-anaerobic tank filling.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The biochemical treatment system for sulfur-containing printing and dyeing wastewater as shown in fig. 1 comprises an aerobic tank 1, an intermediate sedimentation tank 2 and an anaerobic tank 3 which are connected in sequence, wherein the aerobic tank 1 is of an open container structure, an aeration channel 4 is arranged in the middle of the aerobic tank 1, an aerator 6 is arranged at the bottom of the aeration channel 4, an aerobic tank water distribution pipe 7 is laid at the bottom of the aerobic tank 1, aerobic filler 8 is filled in the middle of the aerobic tank 1, the anaerobic tank 3 is of a closed container structure, an anaerobic tank water distribution pipe 9 is laid at the bottom of the anaerobic tank 3, anaerobic filler 10 is filled in the middle of the anaerobic tank 3, a water outlet pipe at the top of the aerobic tank 1 is connected with the intermediate sedimentation tank 2, a sludge return pipe connected with the aerobic tank 1 is arranged at the bottom of the intermediate sedimentation tank 2, and a water outlet pipe of the intermediate sedimentation tank 2 is connected with the anaerobic tank 3 through the anaerobic tank water distribution pipe 9.
The aeration channel 4 is formed by two baffle plates 5 connected with the aerobic tank 1, and the bottoms of the baffle plates 5 and the bottom of the aerobic tank 1 are arranged at intervals; the baffle 5 is fixed by one of welding, buckling or bracket supporting; the aerator 6 adopts one of a spiral-flow type aerator, a microporous aeration disc or a tubular microporous aerator; the aerobic filler 8 and the anaerobic filler 10 are both in a support suspension mode, the fillers are both modified basalt fiber fillers, the diameter of a single fiber bundle is 10-25 cm, the thickness of the single fiber bundle is 2-6 cm, the distance between the fiber bundle and the fiber bundle on the same filler is 7-10 cm, the fiber bundles on two adjacent fillers are in staggered connection layout, and no direct-current channel exists.
The method for treating the sulfur-containing printing and dyeing wastewater by using the biochemical treatment system comprises the following steps:
the sulfur-containing wastewater is pretreated and then pumped into an aerobic tank 1, flows through an aerobic tank water distribution pipe 7 at the bottom to be mixed with sludge in the tank, and flows through an air flow generated by an aerator 6, wherein the mixed liquor rises to the top from an aeration channel 4 and flows around to penetrate through an aerobic filler 8 (a modified basalt fiber filler) to flow downwards to form an internal circulating flow, the aerobic environment created by the aeration channel can efficiently remove ammonia nitrogen, organic matters (including organic nitrogen) and part of toxic sulfides (S2-into elemental sulfur), a liquid straight flow channel is not arranged in a filler area, and the waste water mixed liquor has to penetrate through a biological nest formed by fiber bundles in the descending process so that the waste water is in full contact with functional microorganisms in the biological nest, and pollutants such as ammonia nitrogen, refractory organic matters, nitrate nitrogen and the like are effectively removed in various aerobic, anoxic and anaerobic environments. The concentration of the free sludge in the aerobic tank 1 is kept at 1-3 g/L, the concentration of the dissolved oxygen is kept at 0.5-1.0 mg/L, and the effective hydraulic retention time is 4-8 h.
The effluent of the aerobic tank 1 enters an intermediate sedimentation tank 2, after solid-liquid separation, supernatant enters an anaerobic tank 3, part of the bottom concentrated sludge flows back to the aerobic tank 1, and part of the bottom concentrated sludge is discharged for disposal. The effective retention time of the intermediate sedimentation tank 2 is 1-3 h, and the sludge reflux ratio is controlled at 20% -40%.
Effluent from the intermediate sedimentation tank 2 enters the bottom of an anaerobic tank 3, enters an anaerobic filler 10 region through an anaerobic tank water distribution pipe 9, and gradually rises under the action of inlet water power, and is closely contacted with a domesticated biological nest based on basalt fiber filler, and pollutants such as sulfide (S, S2-, S2O32-, and the like), nitrate nitrogen, ammonia nitrogen and the like are further efficiently removed through sulfur autotrophic denitrifying bacteria, anaerobic ammonia oxidizing bacteria and the like enriched in the biological nest, and the treated wastewater is discharged to enter the next stage; gas generated in the anaerobic tank 3 is discharged from the top end; and the residual sludge at the bottom of the anaerobic tank 3 is periodically cleaned and discharged according to the actual condition. The effective hydraulic retention time in the anaerobic tank 3 is 4-6 h, the anaerobic fillers 10 are closely arranged, and no direct current channel exists, so that the effective contact time of the wastewater and the biological nest can be ensured, solid suspended matters in water can be effectively intercepted, and the effluent SS is ensured.
The main pollutants of the sulfur-containing printing and dyeing wastewater comprise ammonia nitrogen, sulfides, organic matters (containing organic carbon and organic nitrogen), SS and the like, the water quality range of the wastewater is COD 500-2000 mg/L, BOD 5100-400 mg/L, ammonia nitrogen 30-70 mg/L, total nitrogen 50-200 mg/L, sulfides 150-400 mg/L and SS 300-600 mg/L.
The modified basalt fiber adopts a modification method which is one of chitosan coating modification by a physical coating method, chemical grafting modification of SiO 2/polyacrylamide/epoxy resin organic/inorganic coating, diethylamino grafting modification, physical coating cationic polyacrylamide modification, physical coating hexadecyl trimethyl ammonium chloride modification and organic iron modification.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (7)
1. The biochemical treatment system for the sulfur-containing printing and dyeing wastewater is characterized in that: comprises an aerobic tank (1), an intermediate sedimentation tank (2) and an anaerobic tank (3) which are connected in sequence, the aerobic tank (1) is of an open container structure, an aeration channel (4) is arranged in the middle of the aerobic tank, an aerator (6) is arranged at the bottom of the aeration channel (4), an aerobic tank water distribution pipe (7) is laid at the bottom of the aerobic tank (1), an aerobic filler (8) is filled in the middle of the aerobic tank (1), the anaerobic tank (3) is of a closed container structure, the bottom of the anaerobic tank is paved with an anaerobic tank water distribution pipe (9), the middle part of the anaerobic tank (3) is filled with anaerobic filler (10), the top of the aerobic tank (1) is provided with a water outlet pipe which is connected with the intermediate sedimentation tank (2), the bottom of the intermediate sedimentation tank (2) is provided with a sludge return pipe connected with the aerobic tank (1), and the water outlet pipe of the intermediate sedimentation tank (2) is connected with the anaerobic tank (3) through an anaerobic tank water distribution pipe (9).
2. The biochemical treatment system for sulfur-containing printing and dyeing wastewater according to claim 1, characterized in that: the aeration channel (4) is formed by two baffle plates (5) connected with the aerobic tank (1), and the bottoms of the baffle plates (5) and the bottom of the aerobic tank (1) are arranged at intervals.
3. The biochemical treatment system for sulfur-containing printing and dyeing wastewater according to claim 2, characterized in that: the baffle (5) is fixed by one of welding, buckling or support.
4. The biochemical treatment system for sulfur-containing printing and dyeing wastewater according to claim 1, characterized in that: the aerator (6) adopts one of a spiral-flow type aerator, a microporous aeration disc or a tubular microporous aerator.
5. The biochemical treatment system for sulfur-containing printing and dyeing wastewater according to claims 1 to 4, characterized in that: the aerobic filler (8) and the anaerobic filler (10) are both in a support suspension mode, the fillers are all modified basalt fiber fillers, the diameter of a single fiber bundle is 10-25 cm, the thickness of the single fiber bundle is 2-6 cm, the distance between the fiber bundle and the fiber bundle on the same filler is 7-10 cm, the fiber bundles on two adjacent fillers are in staggered connection layout, and no direct-current channel exists.
6. A method for treating sulfur-containing printing and dyeing wastewater by a biochemical treatment system of sulfur-containing printing and dyeing wastewater is characterized by comprising the following steps: the method comprises the following steps: 1) the method comprises the following steps of (1) pumping pretreated sulfur-containing wastewater into an aerobic tank (1), mixing the sulfur-containing wastewater with sludge in the tank through an aerobic tank water distribution pipe (7) at the bottom, allowing the mixed liquor to rise from an aeration channel (4) to the top and flow around through an aerobic filler (8) by virtue of airflow generated by an aerator (6), forming internal circulating flow, keeping the concentration of free sludge in the aerobic tank (1) at 1-3 g/L, keeping the concentration of dissolved oxygen at 0.5-1.0 mg/L, and keeping effective hydraulic retention time at 4-8 h; 2) the effluent of the aerobic tank (1) enters an intermediate sedimentation tank (2), after solid-liquid separation, supernatant enters an anaerobic tank (3), part of bottom concentrated sludge flows back to the aerobic tank (1), and the other part is discharged outside for disposal, the effective retention time of the intermediate sedimentation tank (2) is 1-3 h, and the sludge reflux ratio is controlled at 20% -40%; 3) the effluent of the intermediate sedimentation tank (2) enters the bottom of an anaerobic tank (3) and enters an anaerobic filler (10) region through an anaerobic tank water distribution pipe (9), the wastewater gradually rises under the action of the inlet water power and is closely contacted with the anaerobic filler (10), and the gas generated in the anaerobic tank (3) is discharged from the top end; residual sludge at the bottom of the anaerobic tank (3) is periodically cleaned and discharged according to actual conditions, the effective hydraulic retention time in the anaerobic tank (3) is 4-6 hours, the anaerobic fillers (10) are closely arranged, and no direct-current channel exists.
7. The method for treating the sulfur-containing printing and dyeing wastewater by the biochemical treatment system for the sulfur-containing printing and dyeing wastewater as claimed in claim 6, wherein the method comprises the following steps: the anaerobic filler (10) comprises a biological nest domesticated based on basalt fiber filler, and sulfur autotrophic denitrifying bacteria and anaerobic ammonium oxidation bacteria are enriched inside the biological nest.
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