CN111559835A - Treatment system and treatment method for waste alkali liquor - Google Patents
Treatment system and treatment method for waste alkali liquor Download PDFInfo
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- CN111559835A CN111559835A CN202010528255.0A CN202010528255A CN111559835A CN 111559835 A CN111559835 A CN 111559835A CN 202010528255 A CN202010528255 A CN 202010528255A CN 111559835 A CN111559835 A CN 111559835A
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- 239000002699 waste material Substances 0.000 title claims abstract description 73
- 239000003513 alkali Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001704 evaporation Methods 0.000 claims abstract description 83
- 230000008020 evaporation Effects 0.000 claims abstract description 83
- 230000000694 effects Effects 0.000 claims abstract description 56
- 150000003839 salts Chemical class 0.000 claims abstract description 30
- 238000005352 clarification Methods 0.000 claims abstract description 21
- 241000894006 Bacteria Species 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 39
- 239000010802 sludge Substances 0.000 claims description 32
- 239000004744 fabric Substances 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 230000001580 bacterial effect Effects 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 9
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 8
- 239000012452 mother liquor Substances 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- -1 sulfur ions Chemical class 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- 238000000265 homogenisation Methods 0.000 claims description 4
- 238000010979 pH adjustment Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 241000205145 Desulfobacterium Species 0.000 claims description 2
- 239000004677 Nylon Substances 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 11
- 238000007254 oxidation reaction Methods 0.000 abstract description 8
- 230000003647 oxidation Effects 0.000 abstract description 7
- 238000006477 desulfuration reaction Methods 0.000 abstract description 5
- 230000023556 desulfurization Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000002306 biochemical method Methods 0.000 abstract description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 29
- 230000014759 maintenance of location Effects 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 239000003002 pH adjusting agent Substances 0.000 description 5
- 239000012065 filter cake Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229910052979 sodium sulfide Inorganic materials 0.000 description 3
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229920006052 Chinlon® Polymers 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- MPMSMUBQXQALQI-UHFFFAOYSA-N cobalt phthalocyanine Chemical compound [Co+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 MPMSMUBQXQALQI-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—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
- 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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
-
- 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
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- 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)
- Physical Water Treatments (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a treatment system and a treatment method of waste alkali liquor, which relate to the technical field of chemical wastewater treatment, in particular to a treatment system and a treatment method of waste alkali liquor, and the treatment system comprises an adjusting tank, wherein the adjusting tank is connected with a biochemical system through a pipeline, the biochemical system is connected with a triple-effect evaporation system through a filter, the triple-effect evaporation system is connected with a centrifugal machine, a pH regulator adding port is arranged on the pipeline, the biochemical system comprises an anaerobic tank, an aerobic tank and a clarification tank which are sequentially connected, the anaerobic tank is connected with the adjusting tank through the pipeline, the clarification tank is connected with the filter, and bacteria colonies are added in the anaerobic tank and the aerobic tank; the invention has the following beneficial effects: the method has the advantages of simple operation, good treatment effect and lower operation cost compared with the conventional chemical oxidation method desulfurization, and the direct biochemical method for desulfurization reduces the salt amount increased by chemical reaction, thereby greatly reducing the total salt amount.
Description
Technical Field
The invention relates to the technical field of chemical wastewater treatment, in particular to a treatment system and a treatment method of waste alkali liquor.
Background
The waste liquid produced in the production process of the olefin production device is called waste alkali liquid, the discharge amount of the waste alkali liquid is large, and Na is removed from the waste alkali liquid2CO3NaOH also contains a large amount of Na2S, organic matters and the like, and therefore, the waste lye has complex components and great harm to the environment and needs to be treated.
At present, part of enterprises adopt incineration methods, wet oxidation methods and the like to treat waste alkali liquor, for example, Chinese patent CN 101143746A discloses a treatment method of sulfur-containing waste alkali liquor, the treatment of the waste alkali liquor by adopting supported cobalt phthalocyanine for catalytic oxidation can have better desulfurization effect, but the oxidation product is not Na2SO4And is Na2S2O3In the wet air oxidation treatment method for waste alkali liquor disclosed in CN 109592775 a, the oxidation reaction temperature is 180 ℃ and the pressure is 2.6-2.8MPa, and although a better treatment effect can be obtained, the high-temperature and high-pressure oxidation method has high safety requirements and great operation difficulty, and the low-temperature oxidation is not thorough, so that an economic, efficient and easy-to-operate treatment method for waste alkali liquor is a technical problem which is urgently needed to be solved at present.
Disclosure of Invention
In order to solve the problems, the invention provides an economical, efficient and simple-to-operate treatment system and method for waste alkali liquor, which are used for removing high-concentration COD and sodium sulfide in the waste alkali liquor.
The invention relates to a waste alkali liquor treatment system, which comprises an adjusting tank, wherein the adjusting tank is connected with a biochemical system through a pipeline, the biochemical system is connected with a triple-effect evaporation system through a filter, the triple-effect evaporation system is connected with a centrifugal machine, and a pH regulator adding port is arranged on the pipeline;
the biochemical system comprises an anaerobic tank, an aerobic tank and a clarification tank which are connected in sequence, the anaerobic tank is connected with the regulating tank through the pipeline, the clarification tank is connected with the filter, and the anaerobic tank and the aerobic tank are internally added with the bacterial population;
the triple effect evaporation system comprises a first effect evaporation, a second effect evaporation and a third effect evaporation, wherein liquid inlets are arranged on the upper portions of the first effect evaporation, the second effect evaporation and the third effect evaporation, liquid outlets are arranged on the lower portions of the first effect evaporation and the third effect evaporation, the liquid inlets of the first effect evaporation are connected with a filter, the liquid outlets of the first effect evaporation are connected with the liquid inlets of the second effect evaporation, the liquid outlets of the second effect evaporation are connected with the liquid inlets of the third effect evaporation, a centrifugal machine is connected with the liquid outlets of the third effect evaporation, a centrifugal machine mother liquor outlet is arranged on the centrifugal machine, the centrifugal machine mother liquor outlet is connected with the third effect evaporation liquid inlets through backflow pipelines, and a crystallized salt product outlet is arranged on the centrifugal machine.
Preferably, the clarification tank is connected with a biochemical sludge discharge pipeline, the biochemical sludge discharge pipeline is further connected with a sludge return pipeline, and one end of the sludge return pipeline, which is far away from the biochemical sludge discharge pipeline, is connected with the anaerobic tank.
Preferably, the amount of the sludge returned by the sludge return pipe is 10-30% of the amount of the sludge entering the biochemical sludge discharge pipeline of the clarification tank.
Preferably, a filter layer is arranged in the centrifuge, the filter layer is filter cloth, the filter cloth is woven by satin, and the filter cloth can stretch and can automatically unload materials. The filter cloth can fully separate salt with small particle size, the filter cake layer is cleaned after the filter cloth is cleaned in a telescopic mode, and a new filtering period keeps a better filtering state.
Preferably, the filter cloth is a nylon filter cloth.
Preferably, the centrifuge is a vertical scraper centrifuge.
Preferably, the bacterial population is a bacterial population comprising thiophilus and desulphatobacillus.
A method for treating waste lye uses a waste lye treatment system to treat the waste lye, and comprises the following steps:
pumping waste alkali liquor into an adjusting tank for water quality homogenization, enabling water produced by the adjusting tank to enter an anaerobic tank in a biochemical system through a pipeline, adding a pH adjusting agent into a pH adjusting agent adding port on the pipeline, and adjusting the pH to 9.5-10.5;
the waste alkali liquor enters an anaerobic tank, an aerobic tank and a clarification tank of a biochemical system after being subjected to pH adjustment, sulfur ions are converted into sulfate ions through biochemical action, and the effect of reducing COD is achieved, wherein the retention time of the waste alkali liquor passing through the anaerobic tank is 10-14h, the retention time of the waste alkali liquor passing through the aerobic tank is 36-48h, and the retention time of the waste alkali liquor passing through the clarification tank is 10-14 h;
the waste alkali liquor treated by the biochemical system is treated by a filter and then sequentially enters a first effect evaporation, a second effect evaporation and a third effect evaporation in a three-effect evaporation system, and finally enters a centrifugal machine for solid-liquid separation, crystallized salt is discharged from the centrifugal machine, and centrifugal machine mother liquor flowing out of the centrifugal machine enters the third effect evaporation again through a backflow pipeline; the filter filtration precision is less than 100 um.
Preferably, the bacterial populations added in the aerobic tank and the anaerobic tank are as follows: and (3) carrying out domestication and re-screening in high-salt water rich in reducing sulfide under alkaline conditions to obtain a bacterial population containing the thiophilic bacteria and the desulfobacillus.
Preferably, the triple-effect evaporation system is a triple-effect forced circulation evaporation system.
The invention has the following beneficial effects: the method has the advantages of simple operation, good treatment effect and lower operation cost compared with the conventional chemical oxidation method desulfurization, and the direct biochemical method for desulfurization reduces the salt amount increased by chemical reaction, thereby greatly reducing the total salt amount.
The invention converts sulfide in waste alkali liquor by adding strain groups in an aerobic tank and an anaerobic tank, the conversion rate of the sulfide can reach more than 98 percent, simultaneously, acid substances generated by biochemistry can neutralize partial sodium hydroxide, reduce the alkalinity in water, and simultaneously can reduce COD (chemical oxygen demand) to be less than 100mg/L, thereby realizing the purpose of treating the waste alkali liquor by the strain groups, and not only increasing the salt content, but also diluting and increasing the water content.
Because the salt composition is divided into a plurality of components, the particles formed by crystallization are small, a vertical scraper centrifuge is adopted, a filter layer is arranged in the centrifuge, the filter layer is filter cloth, the filter cloth is woven by satin, and the filter cloth can stretch and can automatically unload materials. The filter cloth can fully separate salt with small particle size, the filter cake layer is cleaned after the filter cloth is cleaned in a telescopic mode, a new filtering period keeps a better filtering state, and crystallized salt can be effectively separated.
The water amount of the waste alkali liquor treated by the method is not increased, the treated product water can be reused in a front-end water unit, the produced salt content is the salt content of the waste alkali liquor, and no chemical agent is used for increasing the salt yield.
Drawings
FIG. 1 is a schematic view of a system for treating waste lye of the present invention.
Reference numerals: 1-waste alkali liquor, 2-adjusting tank, 3-pipeline, 4-pH adjusting agent, 5-anaerobic tank, 6-aerobic tank, 7-clarification tank, 8-biochemical system, 9-sludge reflux pipeline, 10-biochemical sludge discharge pipeline, 11-filter, 12-first effect evaporation, 13-second effect evaporation, 14-third effect evaporation, 15-third effect evaporation system, 16-centrifuge, 17-crystallized salt, 18-centrifuge mother liquor, 19-condensate and 20-bacterial population.
Detailed Description
The invention relates to a waste alkali liquor treatment system, which comprises an adjusting tank 2, wherein the adjusting tank 2 is connected with a biochemical system 8 through a pipeline 3, the biochemical system 8 is connected with a triple-effect evaporation system 15 through a filter 11, the triple-effect evaporation system 15 is connected with a centrifugal machine 16, and a pH regulator 4 adding port is arranged on the pipeline 3;
the biochemical system 8 comprises an anaerobic tank 5, an aerobic tank 6 and a clarification tank 7 which are connected in sequence, the anaerobic tank 5 is connected with the regulating tank 2 through the pipeline 3, the clarification tank 7 is connected with a filter 11, and the anaerobic tank 5 and the aerobic tank 6 are added with a bacterial population 20;
the triple-effect evaporation system 15 comprises a first-effect evaporation 12, a second-effect evaporation 13 and a third-effect evaporation 14, wherein liquid inlets are formed in the upper portions of the first-effect evaporation 12, the second-effect evaporation 13 and the third-effect evaporation 14, liquid outlets are formed in the lower portions of the first-effect evaporation 12, the liquid inlet of the first-effect evaporation 12 is connected with a bag filter 11, the liquid outlet of the first-effect evaporation 12 is connected with the liquid inlet of the second-effect evaporation 13, the liquid outlet of the second-effect evaporation 13 is connected with the liquid inlet of the third-effect evaporation 14, a centrifugal machine 16 is connected with the liquid outlet of the third-effect evaporation 14, a centrifugal machine mother liquid 18 outlet is formed in the centrifugal machine 16, the centrifugal machine mother liquid 18 outlet is connected with the liquid inlet of the third-effect evaporation 14 through a backflow pipeline, and a crystallized salt.
Condensate 19 discharge pipelines are arranged on the first effect evaporation 12, the second effect evaporation 13 and the third effect evaporation 14, and the condensate 19 on the first effect evaporation 12, the second effect evaporation 13 and the third effect evaporation 14 enters a reclaimed water recycling or reclaimed water unit for recycling through the condensate discharge pipelines.
The clarification tank 7 is connected with a biochemical sludge discharge pipeline 10, the biochemical sludge discharge pipeline 10 is connected with a biochemical sludge treatment system, the biochemical sludge discharge pipeline 10 is also connected with a sludge return pipeline 9, and one end of the sludge return pipeline 9, which is far away from the biochemical sludge discharge pipeline 10, is connected with the anaerobic tank 5.
The sludge returned by the sludge return pipe accounts for 10 to 30 percent of the sludge amount entering the biochemical sludge discharge pipeline 10 by the clarification tank 7.
The centrifuge 16 is internally provided with a filter layer which is filter cloth, the filter cloth is woven by satin, and the filter cloth can be stretched and can automatically unload materials. The filter cloth can fully separate salt with small particle size, the filter cake layer is cleaned after the filter cloth is cleaned in a telescopic mode, and a new filtering period keeps a better filtering state.
The filter cloth is a chinlon filter cloth.
The centrifuge 16 is a vertical scraper centrifuge 16.
The bacterial population 20 is a bacterial population comprising thiophilus and desulfobacterium.
A method for treating waste lye uses a waste lye treatment system to treat the waste lye, and comprises the following steps:
the waste alkali liquor 1 is pumped into an adjusting tank 2 for water quality homogenization, the produced water of the adjusting tank 2 enters an anaerobic tank 5 in a biochemical system 8 through a pipeline 3, a pH adjusting agent 4 is added into a pH adjusting agent 4 adding port on the pipeline 3, and the pH is adjusted to 9.5-10.5;
the waste alkali liquor 1 enters an anaerobic tank 5, an aerobic tank 6 and a clarification tank 7 of a biochemical system 8 after pH adjustment, sulfur ions are converted into sulfate ions through biochemical action, and the effect of reducing COD is achieved, wherein the retention time of the waste alkali liquor 1 passing through the anaerobic tank 5 is 10-14h, the retention time of the waste alkali liquor passing through the aerobic tank 6 is 36-48h, and the retention time of the waste alkali liquor passing through the clarification tank 7 is 10-14 h;
the waste alkali liquor 1 treated by the biochemical system 8 is treated by a filter 11 and then sequentially enters a first effect evaporation 12, a second effect evaporation 13 and a third effect evaporation 14 in a three-effect evaporation system 15, and finally enters a centrifugal machine 16 for solid-liquid separation, crystallized salt 17 is discharged from the centrifugal machine 16, and centrifugal machine mother liquor 18 flowing out of the centrifugal machine 16 enters the third effect evaporation 14 again through a return pipeline; the filter 11 has a filtering precision smaller than 100 um.
The strain group 20 added in the aerobic tank 6 and the anaerobic tank 5 is as follows: and (3) domesticating and re-screening the strain group 20 containing the thiophilus and the desulfobacillus in high-salt water rich in reducing sulfides under alkaline conditions.
The triple-effect evaporation system 15 is a triple-effect forced circulation evaporation system.
The water quality condition of the waste alkali liquor 1 is as follows: the pH value is 12, the TDS is less than 35000mg/L, the inorganic salts mainly comprise sodium carbonate, sodium hydroxide and sodium sulfide, wherein the sulfur ions are 6000-8000 mg/L, and in addition, a large amount of COD is more than 10000 mg/L.
The invention has the following beneficial effects: the invention has the advantages of simple operation, good treatment effect, low operation cost and the like, the strain group 20 added into the aerobic tank 6 and the anaerobic tank 5 is used for converting sulfide in the waste alkali liquor 1, the conversion rate of the sulfide can reach more than 98 percent, simultaneously, acid substances generated by biochemistry can neutralize partial sodium hydroxide, the alkalinity in water is reduced, and simultaneously, the COD can be reduced to be less than 100mg/L, thereby realizing the purpose of treating the waste alkali liquor 1 by the strain group 20.
Because the salt composition is divided into a plurality of components, the particles formed by crystallization are small, a vertical scraper centrifuge 16 is adopted, a filter layer is arranged in the centrifuge 16, the filter layer is filter cloth, the filter cloth is woven by satin, and the filter cloth can stretch and can automatically unload materials. The filter cloth can fully separate salt with small particle size, the filter cake layer is cleaned after the filter cloth is cleaned in a telescopic mode, a new filtering period keeps a better filtering state, and the crystal salt 17 can be effectively separated.
Spent lye 1 produced by certain chemical plant DMTO and DCC devices wherein: the sulfide content is 4996.5 mg/L, and the chemical oxygen demand COD content is more than 100000 mg/L.
The treatment method of the waste alkali liquor 1 is adopted, the waste alkali liquor 1 is pumped into the regulating tank 2 for water quality homogenization, the produced water of the regulating tank 2 enters the anaerobic tank 5 in the biochemical system 8 through the pipeline 3, the pH regulator 4 is added into the adding port of the pH regulator 4 on the pipeline 3, and the pH is regulated to 9.5-10.5;
the waste alkali liquor 1 enters an anaerobic tank 5, an aerobic tank 6 and a clarification tank 7 of a biochemical system 8 after pH adjustment, sulfur ions are converted into sulfate ions through biochemical action, and the effect of reducing COD is achieved, wherein the retention time of the waste alkali liquor 1 passing through the anaerobic tank 5 is 12 hours, the time of the waste alkali liquor passing through the aerobic tank 6 is 36 hours, and the time of the waste alkali liquor passing through the clarification tank 7 is 12 hours;
the waste alkali liquor 1 treated by the biochemical system 8 is treated by a filter 11 and then sequentially enters a first effect evaporation 12, a second effect evaporation 13 and a third effect evaporation 14 in a three-effect evaporation system 15, and finally enters a centrifugal machine 16 for solid-liquid separation, crystallized salt 17 is discharged from the centrifugal machine 16, and centrifugal machine mother liquor 18 flowing out of the centrifugal machine 16 enters the third effect evaporation 14 again through a return pipeline; the filter 11 has a filtering accuracy of less than 100um and is used for preventing solid suspended substances from entering the triple-effect evaporation system 15. The sludge reflux amount in the biochemical treatment system is 15 percent, the produced water sulfide content is analyzed to be 63.2 mg/L, and the chemical oxygen demand COD content is analyzed to be 95 mg/L.
The total water content of the waste alkali liquor 1 treated by the method is not increased, the treated produced water can be reused in a front-end water unit, the produced salt content is the salt content of the waste alkali liquor 1, and no chemical agent is used for increasing the salt yield.
Claims (10)
1. A treatment system of waste alkali liquor comprises an adjusting tank (2), and is characterized in that the adjusting tank (2) is connected with a biochemical system (8) through a pipeline (3), the biochemical system (8) is connected with a triple-effect evaporation system (15) through a filter (11), the triple-effect evaporation system (15) is connected with a centrifugal machine (16), and the pipeline (3) is provided with a pH regulator (4) adding port;
the biochemical system (8) comprises an anaerobic tank (5), an aerobic tank (6) and a clarification tank (7) which are sequentially connected, the anaerobic tank (5) is connected with the regulating tank (2) through the pipeline (3), the clarification tank (7) is connected with a filter (11), and a bacterial population (20) is added in the anaerobic tank (5) and the aerobic tank (6);
the triple-effect evaporation system (15) comprises a first-effect evaporation (12), a second-effect evaporation (13) and a third-effect evaporation (14), the upper parts of the first effect evaporation (12), the second effect evaporation (13) and the third effect evaporation (14) are all provided with liquid inlets, the lower parts are all provided with liquid outlets, the liquid inlet of the first-effect evaporator (12) is connected with the filter (11), the liquid outlet of the first-effect evaporator (12) is connected with the liquid inlet of the second-effect evaporator (13), the liquid outlet of the second-effect evaporator (13) is connected with the liquid inlet of the third-effect evaporator (14), the centrifugal machine (16) is connected with a liquid outlet of the third-effect evaporator (14), a centrifugal machine mother liquid (18) outlet is formed in the centrifugal machine (16), the centrifugal machine mother liquid (18) outlet is connected with a liquid inlet of the third-effect evaporator (14) through a backflow pipeline, and a crystallized salt (17) outlet is formed in the centrifugal machine (16).
2. The waste lye treatment system as claimed in claim 1 wherein the clarifier (7) is connected to a biochemical sludge discharge pipe (10), the biochemical sludge discharge pipe (10) is further connected to a sludge return pipe (9), and the end of the sludge return pipe (9) remote from the biochemical sludge discharge pipe (10) is connected to the anaerobic tank (5).
3. The system for treating waste lye of claim 2 wherein the sludge returned from the sludge return line is 10-30% of the sludge amount from the clarifier (7) into the biochemical sludge discharge line (10).
4. The system for treating waste lye of claim 3 wherein the centrifuge (16) is internally provided with a filter layer, wherein the filter layer is a filter cloth, and the filter cloth is a satin woven filter cloth.
5. The system for treating waste lye of claim 4 wherein the filter cloth is a nylon filter cloth.
6. A waste lye treatment system as claimed in claim 5 wherein said centrifuge (16) is a vertical scraper centrifuge (16).
7. The waste lye treatment system of claim 1 wherein the bacterial population (20) is a bacterial population comprising thiophilus and desulfobacterium.
8. A method for treating waste lye, which is characterized in that the waste lye treatment is carried out by using the waste lye treatment system as claimed in any one of the claims 1 to 7, and comprises the following steps:
waste alkali liquor (1) is pumped into a regulating tank (2) for water quality homogenization, water produced by the regulating tank (2) enters an anaerobic tank (5) in a biochemical system (8) through a pipeline (3), a pH regulator (4) is added into a pH regulator (4) adding port on the pipeline (3), and the pH is regulated to 9.5-10.5;
the waste alkali liquor enters an anaerobic tank (5), an aerobic tank (6) and a clarification tank (7) of a biochemical system (8) after being subjected to pH adjustment, sulfur ions are converted into sulfate ions through biochemical action, the effect of reducing COD is achieved, the residence time of the waste alkali liquor passing through the anaerobic tank (5) is 10-14h, the time of the waste alkali liquor passing through the aerobic tank (6) is 36-48h, and the time of the waste alkali liquor passing through the clarification tank (7) is 10-14 h;
after being treated by a biochemical system (8), the waste alkali liquor sequentially enters a first effect evaporation (12), a second effect evaporation (13) and a third effect evaporation (14) in a three-effect evaporation system (15) after being treated by a filter (11), and finally enters a centrifugal machine (16) for solid-liquid separation, crystallized salt (17) is discharged from the centrifugal machine (16), and centrifugal machine mother liquor (18) flowing out of the centrifugal machine (16) enters the third effect evaporation (14) again through a backflow pipeline; the filtering precision of the filter (11) is less than 100 um.
9. The method for treating waste lye of claim 8, wherein the additional flora (20) in the aerobic basin (6) and the anaerobic basin (5) is: and (3) performing domestication and rescreening in high-salt water rich in reducing sulfide under alkaline conditions to obtain a bacterial population (20) containing the thiophilic bacteria and the desulfobacillus.
10. The method for treating waste lye of claim 9 wherein the triple effect evaporation system (15) is a triple effect forced circulation evaporation system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112979036A (en) * | 2021-04-12 | 2021-06-18 | 陕西省石油化工研究设计院 | Waste alkali liquor recycling treatment system and method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5705072A (en) * | 1997-02-03 | 1998-01-06 | Haase; Richard Alan | Biotreatment of wastewater from hydrocarbon processing units |
| US20180170781A1 (en) * | 2016-12-21 | 2018-06-21 | Uop Llc | Digestion of elemental sulfur in bioreactor during biological oxidation of sulfide in wastewater and groundwater |
| CN108529819A (en) * | 2018-04-16 | 2018-09-14 | 黄河三角洲京博化工研究院有限公司 | A kind of Resource comprehensive utilization method of refinery alkaline residue |
| CN109809636A (en) * | 2019-02-28 | 2019-05-28 | 苏州希图环保科技有限公司 | A kind of high concentration organic acids and base process for treating waste liquor |
| WO2020016238A1 (en) * | 2018-07-19 | 2020-01-23 | Stora Enso Oyj | Biological treatment of industrial alkaline streams |
| CN210340600U (en) * | 2019-06-27 | 2020-04-17 | 山东齐旺达石油化工有限公司 | System for treating waste alkali generated by ethylene cracking by combining oxidation and brine crystallization technology |
| CN212451080U (en) * | 2020-06-11 | 2021-02-02 | 陕西省石油化工研究设计院 | Processing system of waste lye |
-
2020
- 2020-06-11 CN CN202010528255.0A patent/CN111559835A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5705072A (en) * | 1997-02-03 | 1998-01-06 | Haase; Richard Alan | Biotreatment of wastewater from hydrocarbon processing units |
| US20180170781A1 (en) * | 2016-12-21 | 2018-06-21 | Uop Llc | Digestion of elemental sulfur in bioreactor during biological oxidation of sulfide in wastewater and groundwater |
| CN108529819A (en) * | 2018-04-16 | 2018-09-14 | 黄河三角洲京博化工研究院有限公司 | A kind of Resource comprehensive utilization method of refinery alkaline residue |
| WO2020016238A1 (en) * | 2018-07-19 | 2020-01-23 | Stora Enso Oyj | Biological treatment of industrial alkaline streams |
| CN109809636A (en) * | 2019-02-28 | 2019-05-28 | 苏州希图环保科技有限公司 | A kind of high concentration organic acids and base process for treating waste liquor |
| CN210340600U (en) * | 2019-06-27 | 2020-04-17 | 山东齐旺达石油化工有限公司 | System for treating waste alkali generated by ethylene cracking by combining oxidation and brine crystallization technology |
| CN212451080U (en) * | 2020-06-11 | 2021-02-02 | 陕西省石油化工研究设计院 | Processing system of waste lye |
Non-Patent Citations (1)
| Title |
|---|
| 王博彦等: "《发酵有机酸生产与应用手册》", 中国轻工业出版社, pages: 249 - 251 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112979036A (en) * | 2021-04-12 | 2021-06-18 | 陕西省石油化工研究设计院 | Waste alkali liquor recycling treatment system and method |
| CN112979036B (en) * | 2021-04-12 | 2024-04-12 | 陕西化工研究院有限公司 | System and method for recycling waste alkali liquor |
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