CN111925072A - Treatment system, process and application for treating sulfate by biochemical method - Google Patents
Treatment system, process and application for treating sulfate by biochemical method Download PDFInfo
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- CN111925072A CN111925072A CN202010888014.7A CN202010888014A CN111925072A CN 111925072 A CN111925072 A CN 111925072A CN 202010888014 A CN202010888014 A CN 202010888014A CN 111925072 A CN111925072 A CN 111925072A
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- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 title claims abstract description 40
- 238000002306 biochemical method Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 29
- 230000008569 process Effects 0.000 title description 13
- 238000006722 reduction reaction Methods 0.000 claims abstract description 51
- 238000006243 chemical reaction Methods 0.000 claims abstract description 49
- 238000004062 sedimentation Methods 0.000 claims abstract description 33
- 239000005864 Sulphur Substances 0.000 claims abstract description 31
- 241000894006 Bacteria Species 0.000 claims abstract description 15
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 10
- 239000002351 wastewater Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 8
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 5
- 239000010802 sludge Substances 0.000 claims description 5
- 150000002505 iron Chemical class 0.000 claims description 3
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052683 pyrite Inorganic materials 0.000 claims description 3
- 239000011028 pyrite Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 239000010842 industrial wastewater Substances 0.000 claims description 2
- 229910021653 sulphate ion Inorganic materials 0.000 claims 1
- -1 sulfur ions Chemical class 0.000 abstract description 12
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 abstract description 7
- YQCIWBXEVYWRCW-UHFFFAOYSA-N methane;sulfane Chemical compound C.S YQCIWBXEVYWRCW-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 abstract description 7
- 239000011593 sulfur Substances 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 6
- 239000010865 sewage Substances 0.000 abstract description 6
- 150000003839 salts Chemical class 0.000 description 13
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 9
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 9
- KAEAMHPPLLJBKF-UHFFFAOYSA-N iron(3+) sulfide Chemical compound [S-2].[S-2].[S-2].[Fe+3].[Fe+3] KAEAMHPPLLJBKF-UHFFFAOYSA-N 0.000 description 8
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 6
- 229910001424 calcium ion Inorganic materials 0.000 description 6
- 229910052602 gypsum Inorganic materials 0.000 description 6
- 239000010440 gypsum Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 244000005700 microbiome Species 0.000 description 5
- 239000006228 supernatant Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 229920000881 Modified starch Polymers 0.000 description 2
- 239000004368 Modified starch Substances 0.000 description 2
- LCTONWCANYUPML-UHFFFAOYSA-N Pyruvic acid Chemical compound CC(=O)C(O)=O LCTONWCANYUPML-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000005842 biochemical reaction Methods 0.000 description 2
- 239000000872 buffer Substances 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000009960 carding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 230000004151 fermentation Effects 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 235000019426 modified starch Nutrition 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 241000605809 Desulfuromonas Species 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
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- GVXIVWJIJSNCJO-UHFFFAOYSA-L aluminum;calcium;sulfate Chemical compound [Al+3].[Ca+2].[O-]S([O-])(=O)=O GVXIVWJIJSNCJO-UHFFFAOYSA-L 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000036983 biotransformation Effects 0.000 description 1
- 201000001883 cholelithiasis Diseases 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 235000013379 molasses Nutrition 0.000 description 1
- 238000003541 multi-stage reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229940107700 pyruvic acid Drugs 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion 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
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)
- Removal Of Specific Substances (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a treatment system for treating sulfate by a biochemical method, which belongs to the field of sewage treatment and comprises the following steps: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence. The sulfate radical is converted into sulfur ions through reduction in the SRB reactor through the sulfate radical reducing bacteria, and then iron sulfide is precipitated, so that the solubility of the iron sulfide is extremely low, and the removal efficiency of the sulfate radical is improved, wherein the removal efficiency of the sulfate radical reducing bacteria reaches over 90 percent under the conditions that the oxidation-reduction potential is-100 mv and the carbon-sulfur ratio is 5: 1.
Description
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to a treatment process for treating sulfate by a biochemical method.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
In the industrial sewage treatment industry, a large amount of sulfuric acid is added in the production process of biological fermentation pharmacy in the pharmacy industry, so that the fermentation pharmacy wastewater contains a large amount of sulfate radicals, and the problems of high treatment difficulty, high operating cost and the like of a terminal water treatment system are caused after the sulfate radicals enter a sewage treatment system. At present, the domestic sewage treatment application method for removing sulfate radicals mainly comprises a gypsum precipitation method for generating gypsum by using the reaction of calcium ions in lime and sulfate radicals and a double-salt method for forming calcium sulfate aluminum salt (cholelithiasis) by using the reaction of the calcium ions, the aluminum ions and the sulfate radicals, but the inventor finds that: the gypsum precipitation method and the double salt method have the following problems:
A. problems with lime precipitation
1. In the application process of removing sulfate radicals by a gypsum method, the ph of the wastewater needs to be regulated to be below 3 so as to ensure the removal of the sulfate radicals, thereby causing the problem of high front-end operation cost;
2. calcium sulfate has certain solubility, and sulfate radicals are difficult to remove after being reduced to 3000 mg/l;
3. aiming at ph-neutral wastewater, the efficiency of removing sulfate radicals by a gypsum method is low and generally does not exceed 50 percent;
4. a gypsum method for removing sulfate radicals introduces a large amount of calcium ions, so that a back-end biochemical treatment system is seriously scaled; B. problems with the double salt method
1. A large amount of calcium ions and aluminum ions are required to be added in the process of removing sulfate radicals by a double-salt method, the operation cost per ton of water for removing 1000mg/l of sulfate radicals is about 6.5 yuan, and the operation cost is high;
2. the double salt method is a composite reaction of various ions, the reaction condition is strictly controlled, and the operation difficulty is higher;
3. the double-salt method determines the drug adding amount according to the sulfate ion concentration, the detection means has poor instantaneity, and the running impact resistance is weak.
Disclosure of Invention
In order to overcome the problems, the invention provides a treatment process for treating sulfate by a biochemical method. The sulfate radical is converted into sulfide ions, and then the iron sulfide is precipitated, so that the solubility of the iron sulfide is extremely low, the removal efficiency of the sulfate radical is improved, and the removal efficiency reaches over 90 percent.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in a first aspect of the present invention, there is provided a treatment system for biochemical treatment of sulfate, comprising: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence.
According to the invention, sulfate radicals are converted into sulfur ions through the reduction action in the SRB reactor through the conversion of sulfate radical reducing bacteria, and then ferric sulfide is precipitated, so that the solubility of ferric sulfide is extremely low, and the removal efficiency of the sulfate radicals is further improved, wherein the removal efficiency of the sulfate radical reducing bacteria reaches over 90% under the conditions that the oxidation-reduction potential is-100 mv and the carbon-sulfur ratio is 5: 1;
in a second aspect of the present invention, there is provided a treatment method for treating sulfate by a biochemical method, comprising:
reducing the wastewater, and sequentially adding a carbon source and sodium bicarbonate to treat the wastewater to obtain pretreated wastewater;
carrying out anaerobic reaction on the pretreated wastewater in the presence of sulfate reducing bacteria and anaerobic flocculent sludge;
and adding iron salt into the wastewater after the anaerobic treatment to remove sulfate radicals, thus obtaining the product.
The reaction mechanism of the present invention is as follows: in an absolute anaerobic environment, through strain inoculation and domestication, organic matters in wastewater are converted into lactic acid, pyruvic acid, ethanol or certain fatty acids by using hydrolysis, hydrogen production and acetic acid production strains in anaerobic microorganisms, then microbial floras of Desulfurvibrio, Desulfuromonas, Desulfurphyllum, Desulfurenterobacter and the like in the anaerobic microorganisms are used, the fatty acids are used as carbon sources and energy sources, sulfate is reduced into hydrogen sulfide, and iron ions and the sulfur ions react to generate iron sulfide precipitate so as to achieve the purpose of removing sulfate radicals.
In a third aspect of the invention, there is provided the use of any one of the above-described biochemical sulfate treatment systems in industrial wastewater treatment.
The system of the invention has high removal efficiency of sulfate radicals, overcomes the problems of high operation cost, low removal efficiency of sulfate radicals and system scaling caused by introducing calcium ions in the existing chemical method, and is expected to be widely applied to industrial sewage treatment.
The invention has the beneficial effects that:
(1) through the conversion of sulfate radical reducing bacteria, sulfate radicals are converted into sulfur ions through reduction in an SRB reactor, and then iron sulfide is precipitated, so that the solubility of iron sulfide is extremely low, and the removal efficiency of the sulfate radicals is further improved, wherein the removal efficiency reaches over 90 percent under the conditions that the oxidation-reduction potential of the sulfate radical reducing bacteria is-100 mv and the carbon-sulfur ratio is 5: 1;
(2) the biochemical method utilizes the biotransformation of microorganisms, and has lower operation cost;
(3) calcium ions are not introduced during the operation of the system, so that the problem of scaling of the subsequent system is solved.
(4) The method is simple, high in removal efficiency, strong in practicability and easy to popularize.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic view of the structure of a reduction reaction tank according to the present invention;
FIG. 3 is a schematic structural view of an SRB anaerobic reactor according to the present invention;
FIG. 4 is a schematic structural diagram of the pyrite reaction tank 18 and the sedimentation tank 19 of the present invention;
wherein, 1: a reducing agent dosing system; 2: a compound carbon source dosing system; 3: a sodium bicarbonate dosing system; 4. a reduction reaction tank; 5: a Roots blower; 6: an aeration system; 7: an SRB anaerobic reactor; 8: a lift pump; 9: an oxidation-reduction potentiometer; 10: a water inlet flow meter; 11: a water distributor; 12: a three-phase separator; 13: a water distribution pipeline; 14: a sludge discharge system; 15: an external circulation flow meter; 16: a ferric salt dosing system; 17: a submersible mixer; 18: a ferro-sulphur reaction tank; 19: a sedimentation tank; 20: a mud scraper; 21: an external water circulation pump.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate that the directions of movement are consistent with those of the drawings, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element needs to have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The terms "mounted", "connected", "fixed", and the like in the present invention are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
A treatment process for treating sulfate by a biochemical method,
process flow
(1) The wastewater firstly enters a reduction reaction tank, a reducing agent is added into the reduction reaction tank, the oxidation-reduction potential of the wastewater is controlled below-100 mv, and meanwhile, the ph is regulated to 6.5-7.8;
(2) the carbon source is added into the reduction reaction tank, and the carbon-sulfur ratio of the wastewater is controlled to be about 5:1, so that the normal operation of biochemical reaction is facilitated;
(3) sodium bicarbonate is added into the reduction tank, so that the alkalinity of the wastewater is controlled to be above 2000mg/l, and the buffer capacity is provided for anaerobic reaction;
(4) the wastewater after passing through the reduction reaction tank enters an SRB anaerobic reactor, mixed flocculent sludge is added into the reactor, the adding amount of strains is 50g/l, the system is domesticated by microorganisms for 2-3 months, sulfate reducing bacteria and anaerobic reaction strains develop into dominant flora, the concentration of the dominant flora is controlled to be 15-20g/l finally, sulfate is reduced into hydrogen sulfide by utilizing the sulfate reducing bacteria, one part of hydrogen sulfide generated by reaction enters a methane system, and the other part of hydrogen sulfide enters a subsequent carding process;
(5) and (2) the wastewater enters a ferro-sulphur reaction tank after passing through the SRB reactor, hydrogen sulfide reacts with ferric salt to generate ferric sulfide precipitate by adding ferric salt, the purpose of removing sulfate radicals is achieved by discharging iron mud, part of supernatant of a sedimentation tank enters a subsequent treatment system, and part of supernatant flows back to the SRB reactor.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1:
process flow
(1) Wastewater firstly enters a reduction reaction tank, the oxidation-reduction potential of the wastewater is controlled below-100 mv by adding a reducing agent sodium sulfite into the reduction reaction tank, and meanwhile, ph is adjusted to 6.5-7.8;
(2) a carbon source is added into the reduction reaction tank, wherein the carbon source is mainly glucose or molasses, and the carbon-sulfur ratio of the wastewater is controlled to be about 5:1, so that the normal biochemical reaction is facilitated;
(3) sodium bicarbonate is added into the reduction tank, so that the alkalinity of the wastewater is controlled to be above 2000mg/l, and the buffer capacity is provided for anaerobic reaction;
(4) the wastewater after passing through the reduction reaction tank enters an SRB anaerobic reactor, mixed flocculent sludge is added into the reactor, the adding amount of strains is 50g/l, the system is domesticated by microorganisms for 2-3 months, sulfate reducing bacteria and anaerobic reaction strains develop into dominant flora, the concentration of the dominant flora is controlled to be 15-20g/l finally, sulfate is reduced into hydrogen sulfide by utilizing the sulfate reducing bacteria, one part of hydrogen sulfide generated by reaction enters a methane system, and the other part of hydrogen sulfide enters a subsequent carding process;
(5) after passing through the SRB reactor, the wastewater enters a ferric sulfate reaction tank, ferric chloride solution with the concentration of 30% is added into ferric salt, the molar ratio of the ferric salt to sulfate radical is 0.7:1, ferric salt is added, hydrogen sulfide and ferric salt react to generate ferric sulfide precipitate, the purpose of removing sulfate radical is achieved by discharging iron mud, one part of supernatant of a precipitation tank enters a subsequent treatment system, and the other part of supernatant flows back to the SRB reactor.
Experimental example 2
The modified starch wastewater is treated by adopting the device and the process in the embodiment 1, and the specific test data is as follows:
TABLE 1 modified starch wastewater sulfate removal test data by biochemical method
Example 3
A treatment system for biochemical treatment of sulfate, comprising: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence.
According to the invention, sulfate radicals are converted into sulfur ions through the reduction action in the SRB reactor through the conversion of sulfate radical reducing bacteria, and then ferric sulfide is precipitated, so that the solubility of ferric sulfide is extremely low, and the removal efficiency of the sulfate radicals is further improved, wherein the removal efficiency of the sulfate radical reducing bacteria reaches over 90% under the conditions that the oxidation-reduction potential is-100 mv and the carbon-sulfur ratio is 5: 1;
example 4
A treatment system for biochemical treatment of sulfate, comprising: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence.
(6) The reduction reaction tank 4 is respectively connected with a reducing agent dosing system 1, a composite carbon source dosing system 2 and a sodium bicarbonate dosing system 3. Reducing agents, carbon sources and sodium bicarbonate are respectively added into the reduction reaction tank, so that parameters such as oxidation-reduction potential ph, carbon-sulfur ratio, alkalinity and the like of the wastewater are effectively regulated and controlled, and the subsequent biochemical and anaerobic treatment efficiency is improved.
Example 5
A treatment system for biochemical treatment of sulfate, comprising: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence.
The bottom of the reduction reaction tank 4 is provided with an aeration system 6 to inject gas into water, increase dissolved oxygen in the water and improve the reduction reaction efficiency.
Example 6
A treatment system for biochemical treatment of sulfate, comprising: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence.
The aeration system 6 is connected with the Roots blower 5, and the Roots blower is used as an air source to meet the requirements on air pressure and air volume.
Example 7
A treatment system for biochemical treatment of sulfate, comprising: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence.
A lift pump 8, an oxidation-reduction potentiometer 9 and a water inlet flow meter 10 are arranged between the reduction reaction tank 4 and the SRB anaerobic reactor 7, wastewater after the reduction reaction tank is led into the SRB anaerobic reactor, and sulfate radicals are converted into sulfur ions by sulfate radical reducing bacteria.
Example 8
A treatment system for biochemical treatment of sulfate, comprising: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence.
The top of the SRB anaerobic reactor 7 is provided with a water distributor 11, and the inside of the SRB anaerobic reactor is provided with: a three-phase separator 12 and a water distribution pipeline 13, wherein the water distribution pipeline 13 is connected with the water distributor 11 to improve the treatment efficiency of the wastewater.
Example 9
A treatment system for biochemical treatment of sulfate, comprising: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence.
The ferro-sulphur reaction tank 18 is connected with the ferric salt dosing system 16, ferric sulfide precipitate is formed by the addition of ferric salt and sulfur ions, the solubility of ferric sulfide is extremely low, and the removal efficiency of sulfate radicals is further improved.
Example 10
A treatment system for biochemical treatment of sulfate, comprising: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence.
And a submersible stirrer 17 is arranged in the ferro-sulphur reaction tank 18 to improve the mixing efficiency and ensure that the ferric salt is fully contacted with the sulphur ions.
Example 11
A treatment system for biochemical treatment of sulfate, comprising: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence.
The sedimentation tank 19 is provided with a mud scraper 20 and is connected with the SRB anaerobic reactor 7 through an external circulation pipeline so as to clear out the mud at the bottom of the sedimentation tank in time and reduce the overflow of the mud.
Example 12
A treatment system for biochemical treatment of sulfate, comprising: a reduction reaction tank 4, an SRB anaerobic reactor 7, a ferro-sulphur reaction tank 18 and a sedimentation tank 19; the reduction reaction tank 4, the SRB anaerobic reactor 7, the ferro-sulphur reaction tank 18 and the sedimentation tank 19 are connected in sequence.
An external circulation flow meter 15 and an external circulation water pump 21 are arranged on the external circulation pipeline, and part of supernatant in the sedimentation tank is recycled, so that the utilization rate of circulating water is improved.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. 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. Although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A system for biochemical treatment of sulfate, comprising: a reduction reaction tank (4), an SRB anaerobic reactor (7), a ferro-sulphur reaction tank (18) and a sedimentation tank (19); the reduction reaction tank (4), the SRB anaerobic reactor (7), the ferro-sulphur reaction tank (18) and the sedimentation tank (19) are connected in sequence.
2. The system for treating sulfate by using the biochemical method according to claim 1, wherein the reduction reaction tank (4) is connected with a reducing agent dosing system (1), a composite carbon source dosing system (2) and a sodium bicarbonate dosing system (3) respectively.
3. The system for biochemical treatment of sulfate according to claim 1, wherein the bottom of the reduction reaction tank (4) is provided with an aeration system (6).
4. A biochemical sulphate treatment system according to claim 3 wherein the aeration system (6) is connected to a roots blower (5).
5. The biochemical treatment system for sulfate according to claim 1, wherein a lift pump (8), an oxidation-reduction potentiometer (9) and a water inlet flow meter (10) are arranged between the reduction reaction tank (4) and the SRB anaerobic reactor (7).
6. The biochemical treatment system for sulfate according to claim 1, wherein the SRB anaerobic reactor (7) is provided with a water distributor (11) at the top and is internally provided with: the three-phase separator (12) and a water distribution pipeline (13), wherein the water distribution pipeline (13) is connected with the water distributor (11).
7. The system for biochemical treatment of sulfate according to claim 1, wherein the pyrite reaction tank (18) is connected to an iron salt dosing system (16).
8. The system for biochemical treatment of sulfate according to claim 1, wherein a submersible mixer (17) is disposed in the pyrite reaction tank (18);
or the sedimentation tank (19) is provided with a mud scraper (20) and is connected with the SRB anaerobic reactor (7) through an external circulation pipeline;
or an external circulation flow meter (15) and an external circulation water pump (21) are arranged on the external circulation pipeline.
9. A treatment method for treating sulfate by a biochemical method is characterized by comprising the following steps:
reducing the wastewater, and sequentially adding a carbon source and sodium bicarbonate to treat the wastewater to obtain pretreated wastewater;
carrying out anaerobic reaction on the pretreated wastewater in the presence of sulfate reducing bacteria and anaerobic flocculent sludge;
and adding iron salt into the wastewater after the anaerobic treatment to remove sulfate radicals, thus obtaining the product.
10. Use of a biochemical sulfate treatment system according to any of claims 1-8 for the treatment of industrial wastewater.
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