CN115231775A - Method for treating pharmaceutical chemical high-salinity wastewater - Google Patents
Method for treating pharmaceutical chemical high-salinity wastewater Download PDFInfo
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- CN115231775A CN115231775A CN202210883636.XA CN202210883636A CN115231775A CN 115231775 A CN115231775 A CN 115231775A CN 202210883636 A CN202210883636 A CN 202210883636A CN 115231775 A CN115231775 A CN 115231775A
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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
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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
- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/343—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the pharmaceutical industry, e.g. containing antibiotics
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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Abstract
The invention relates to the technical field of wastewater treatment, in particular to a method for treating high-salinity wastewater in pharmaceutical and chemical industries, which comprises the following steps: high salt waste water passes through the equalizing basin in proper order, the anaerobism pond, get into two heavy ponds after the good oxygen pond group handles and deposit, upper liquid in two heavy ponds passes through reaction sedimentation tank one in proper order, reaction sedimentation tank two reaction sedimentation handles, the second upper liquid of reaction sedimentation tank is nanofiltration after the ultrafiltration, receive and strain and obtain monovalent salt waste water and divalent salt waste water, divalent salt waste water discharge, monovalent salt waste water obtains monovalent salt hyperconcentration water and does not contain salt water through reverse osmosis treatment, monovalent salt hyperconcentration water is through MVR evaporation crystallization salt manufacturing, it is as the reuse of reclaimed water to not contain salt water. The wastewater treated by the method can be reused as reclaimed water, and secondary industrial salt can be obtained, so that resource utilization is realized.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method for treating high-salinity wastewater in pharmaceutical and chemical industries.
Background
In the production process of pharmaceutical chemicals, a large amount of acidic or alkaline substances are used, so that a large amount of inorganic salt is finally generated after neutralization of the acidic or alkaline substances and meanwhile, a large amount of inorganic salt solution is also used for washing treatment in the production process, so that a large amount of pharmaceutical and chemical high-salt wastewater is finally formed.
Disclosure of Invention
Aiming at the technical problems that the high-salinity wastewater treatment effect is poor and the wastewater cannot be recycled, the invention provides the method for treating the high-salinity wastewater in the pharmaceutical and chemical industry.
The invention provides a method for treating pharmaceutical chemical high-salinity wastewater, which comprises the following steps: high salt waste water passes through the equalizing basin in proper order, the anaerobism pond, get into two heavy ponds after the good oxygen pond group handles and deposit, upper liquid in two heavy ponds passes through reaction sedimentation tank one in proper order, reaction sedimentation tank two reaction sedimentation handles, the second upper liquid of reaction sedimentation tank is nanofiltration after the ultrafiltration, receive and strain and obtain monovalent salt waste water and divalent salt waste water, divalent salt waste water discharge, monovalent salt waste water obtains monovalent salt hyperconcentration water and does not contain salt water through reverse osmosis treatment, monovalent salt hyperconcentration water is through MVR evaporation crystallization salt manufacturing, it is as the reuse of reclaimed water to not contain salt water.
Further, the wastewater is controlled to carry out denitrification reaction in the anaerobic tank, and the wastewater carries out denitrification under the action of anaerobic bacteria in the anaerobic tank, so that nitrogen and phosphorus nutrient substances in the wastewater are removed.
Further, the aerobic tank group comprises an aerobic tank I and an aerobic tank II which are connected in series.
Further, the wastewater is controlled to be nitrified in the first aerobic tank and the second aerobic tank, and the wastewater is nitrified in the first aerobic tank and the second aerobic tank to remove organic matters and reduce COD of the wastewater.
Further, the wastewater is treated by flocculation and precipitation in a reaction sedimentation tank I, and the flocculation and precipitation treatment process comprises the steps of adding a pH regulator to adjust the pH of the wastewater to 11-12, adding an anionic flocculant for flocculation, standing for precipitation, and removing Ca in the wastewater by flocculation and precipitation under the action of the flocculant 2+ 、Mg 2+ 、F - 、SiO 2 And so on.
Further, the pH regulator is one or more of quicklime, caustic soda and sodium carbonate.
And further, adding a Fenton reagent into the wastewater in the second reaction sedimentation tank for treatment, adjusting the pH value of the wastewater to 4-4.5, adding a cationic flocculant for flocculation, and standing for sedimentation. Residual organic matters in the wastewater can be removed by using the oxidation action of the Fenton reagent.
Furthermore, the ultra-filtered backwashing water is sent to the first aerobic tank.
The invention removes large particles and colloid in the waste water by ultrafiltration; the monovalent salt and the divalent salt wastewater are separated by nanofiltration, mainly NaCl and Na are separated 2 SO 4 (ii) a Preparing saline-free water and monovalent salt super-concentrated water through reverse osmosis, wherein the saline-free water is used for recycling reclaimed water, and the monovalent salt super-concentrated water enters MVR; monovalent salts are prepared by MVR evaporative crystallization and used as secondary industrial salts.
The invention has the beneficial effects that the reclaimed water COD obtained after the treatment of the invention<10mg/L, hardness of 0mg/L, TDS<30mg/L, naCl concentration<20mg/L，Na 2 SO 4 Concentration of 0mg/L, SO 4 2- Concentration of 0mg/L, cl - Concentration of<15mg/L, excellent treatment effect; at the same time, the invention preparesThe sodium chloride salt meets the standard of GB/T5462-2015 industrial wet salt sodium chloride secondary product, and realizes resource utilization.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a process flow diagram of an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for treating high-salinity wastewater in pharmaceutical and chemical industries comprises the following steps:
(1) High-salinity wastewater (total salinity of 5000mg/L and COD of 1000 mg/L) from a workshop enters a regulating tank, and upstream sewage is fully mixed to stabilize water inlet indexes and ensure water quality balance;
(2) The wastewater reaches an anaerobic tank, nitrogen and phosphorus nutrient substances are removed under the action of denitrification in the anaerobic tank, organic substances are removed under the action of nitrification in a first aerobic tank and a second aerobic tank to reduce COD, and then the wastewater enters a secondary sedimentation tank to realize sludge-water separation; if the concentration of organic matters in the wastewater is lower, the wastewater can be directly transferred to a secondary sedimentation tank only after denitrification treatment in the first aerobic tank;
(3) The upper layer liquid of the secondary sedimentation tank enters a first reaction sedimentation tank, lime is added to adjust the pH value to 11-12, then an anionic flocculant is added, and the mixture is kept stand and sedimentated to remove Ca carried by the wastewater 2+ 、F - 、Mg 2+ 、SiO 2 And the separated supernatant enters a second reaction sedimentation tank, ferrous chloride and hydrogen peroxide (Fenton reagent) are added into the second reaction sedimentation tank at the same time, the pH is adjusted to 4.5-5, a cationic flocculant is added, and residual organic matters in water are removed after standing and sedimentation;
(4) The upper liquid of the secondary sedimentation tank enters an ultrafiltration system for ultrafiltration, the water with colloid and particulate matters filtered out enters a nanofiltration system for nanofiltration, divalent salt wastewater is separated and discharged through nanofiltration, and the wastewater containing monovalent salt is sent to reverse osmosis; the ultrafiltration system is provided with a backwashing device which can clean trapped colloid and particles, and backwashing water is discharged to the aerobic tank for recycling;
(5) Concentrating wastewater containing monovalent salt into monovalent salt-containing super-concentrated water through reverse osmosis, and obtaining salt-free water, wherein the monovalent salt-containing super-concentrated water is subjected to evaporative crystallization to prepare salt through MVR, and the salt-free pure water is used for reclaimed water recycling;
the chemical indices for the brine free preparation of example 1 are as follows: COD<10mg/L, hardness of 0mg/L, TDS<30mg/L, naCl concentration<20mg/L，Na 2 SO 4 Concentration of 0mg/L, SO 4 2- Concentration of 0mg/L, cl - Concentration of<15mg/L。
The sodium chloride salt prepared by crystallization in the embodiment 1 meets the standard of a secondary product of GB/T5462-2015 industrial wet salt sodium chloride, is used as a secondary industry, and realizes resource utilization.
Example 2
A method for treating high-salinity wastewater in pharmaceutical and chemical industries comprises the following steps:
(1) High-salinity wastewater (total salinity of 5500mg/L and COD of 800 mg/L) from a workshop enters an adjusting tank, and upstream sewage is fully mixed to stabilize water inlet indexes and ensure water quality balance;
(2) The wastewater reaches the facultative anaerobic tank, nitrogen and phosphorus nutrients are removed under the denitrification action in the facultative anaerobic tank, nitrification is performed in the first aerobic tank and the second aerobic tank to remove organic matters and reduce COD, and then the wastewater enters the secondary sedimentation tank to realize sludge-water separation; if the concentration of organic matters in the wastewater is low, the wastewater can be directly transferred to a secondary sedimentation tank after being treated under the action of denitrification of the first aerobic tank;
(3) The upper layer liquid of the secondary sedimentation tank enters a first reaction sedimentation tank, caustic soda is added to adjust the pH value to 11-12, then an anionic flocculant is added, and the Ca carried by the wastewater is removed by standing and sedimentation 2+ 、F - 、Mg 2+ 、SiO 2 And the separated supernatant enters a second reaction sedimentation tank, ferrous chloride and hydrogen peroxide (Fenton reagent) are simultaneously added into the second reaction sedimentation tank, the pH value is adjusted to 4.5-5, a cationic flocculant is added, and residual organic matters in water are removed after standing and sedimentation;
(4) The upper liquid of the secondary sedimentation tank enters an ultrafiltration system for ultrafiltration, the water with colloid and particulate matters filtered out enters a nanofiltration system for nanofiltration, divalent salt wastewater is separated and discharged through nanofiltration, and the wastewater containing monovalent salt is sent to reverse osmosis;
(5) And concentrating the wastewater containing monovalent salt into monovalent salt-containing super-concentrated water through reverse osmosis to obtain salt-free water, performing evaporative crystallization on the monovalent salt-containing super-concentrated water through MVR to prepare salt, and using the salt-free pure water for reclaimed water recycling.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (8)
1. A method for treating high-salinity wastewater in pharmaceutical and chemical industries is characterized by comprising the following steps: high salt waste water passes through the equalizing basin in proper order, the anaerobism pond, get into two heavy ponds after the good oxygen pond group handles and deposit, upper liquid in two heavy ponds passes through reaction sedimentation tank one in proper order, reaction sedimentation tank two reaction sedimentation handles, the second upper liquid of reaction sedimentation tank is nanofiltration after the ultrafiltration, receive and strain and obtain monovalent salt waste water and divalent salt waste water, divalent salt waste water discharge, monovalent salt waste water obtains monovalent salt hyperconcentration water and does not contain salt water through reverse osmosis treatment, monovalent salt hyperconcentration water is through MVR evaporation crystallization salt manufacturing, it is as the reuse of reclaimed water to not contain salt water.
2. The method according to claim 1, wherein the wastewater is controlled to undergo denitrification reaction in the anaerobic tank.
3. The method for treating high-salinity wastewater in pharmaceutical and chemical industries according to claim 1, wherein the aerobic tank group comprises an aerobic tank I and an aerobic tank II which are connected in series.
4. The method for treating high-salinity wastewater in pharmaceutical and chemical industries according to claim 3, wherein the wastewater is controlled to be nitrified in the first aerobic tank and the second aerobic tank.
5. The method for treating pharmaceutical and chemical high-salt wastewater as claimed in claim 1, wherein the wastewater is subjected to flocculation and precipitation treatment in a first reaction sedimentation tank, and the flocculation and precipitation treatment comprises the steps of adding a pH regulator to adjust the pH of the wastewater to 11-12, adding an anionic flocculant to flocculate, and standing for precipitation.
6. The method for treating pharmaceutical and chemical high-salt wastewater as claimed in claim 5, wherein the pH regulator is one or more of quicklime, caustic soda and soda ash.
7. The method for treating high-salt wastewater in pharmaceutical and chemical industries of claim 1, wherein the wastewater in the second reaction sedimentation tank is treated by adding Fenton reagent, adjusting the pH of the wastewater to 4-4.5, adding cationic flocculant for flocculation, and standing for sedimentation.
8. The method for treating pharmaceutical and chemical high-salt wastewater as set forth in claim 3 or 4, wherein the ultrafiltrated backwash water is sent to the first aerobic tank.
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| CN202210883636.XA CN115231775A (en) | 2022-07-26 | 2022-07-26 | Method for treating pharmaceutical chemical high-salinity wastewater |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104003581A (en) * | 2014-06-09 | 2014-08-27 | 江苏德鑫环保科技有限公司 | Treatment process of high-concentration degradation-resistant organic wastewater |
| CN105439395A (en) * | 2016-01-04 | 2016-03-30 | 大唐国际化工技术研究院有限公司 | Zero-discharge treatment method of salt-containing organic wastewater |
| CN109354348A (en) * | 2018-12-27 | 2019-02-19 | 河南君和环保科技有限公司 | The integrated processing method of vitamin B12 production waste water |
| CN114426360A (en) * | 2020-09-16 | 2022-05-03 | 中国石油化工股份有限公司 | Treatment system and treatment method for high-salinity wastewater in coal chemical industry |
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- 2022-07-26 CN CN202210883636.XA patent/CN115231775A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104003581A (en) * | 2014-06-09 | 2014-08-27 | 江苏德鑫环保科技有限公司 | Treatment process of high-concentration degradation-resistant organic wastewater |
| CN105439395A (en) * | 2016-01-04 | 2016-03-30 | 大唐国际化工技术研究院有限公司 | Zero-discharge treatment method of salt-containing organic wastewater |
| CN109354348A (en) * | 2018-12-27 | 2019-02-19 | 河南君和环保科技有限公司 | The integrated processing method of vitamin B12 production waste water |
| CN114426360A (en) * | 2020-09-16 | 2022-05-03 | 中国石油化工股份有限公司 | Treatment system and treatment method for high-salinity wastewater in coal chemical industry |
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