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Concentration method for salt-containing wastewater and recycling method for salt-containing wastewater

A technology of salty wastewater and treatment methods, which is applied in water/sewage treatment, biological water/sewage treatment, oxidized water/sewage treatment, etc., can solve problems such as high cost, ineffective integration of functions, and inability to achieve zero discharge, etc., to achieve Low cost, long operation cycle, and the effect of improving recovery rate

Active Publication Date: 2018-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

This method combines membrane technologies such as nanofiltration, frequent electrode reversal electrodialysis, and reverse osmosis, but the effects of different membrane technologies have not been effectively integrated, and pretreatment requires advanced treatment such as ion exchange, which is costly; Sodium chloride crystallization and sodium sulfate crystallization, but after analysis and testing, if this method needs to ensure the purity of the crystallized salt, a certain amount of high-concentration saline wastewater needs to be discharged, and zero discharge cannot be achieved, and the salt recovery rate needs further improvement. improve

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  • Concentration method for salt-containing wastewater and recycling method for salt-containing wastewater

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preparation example Construction

[0045] The preparation method of the salt-tolerant de-COD denitrification microbial bacterial agent of (3) of the present invention comprises the following contents:

[0046] (1) Paracoccus FSTB-2, Microbacterium kitami FSTB-4 and Pseudomonas stutzeri FSTB-5 were inoculated on FSTB solid medium for activation; SDN-3 was respectively inoculated on the corresponding solid medium for activation;

[0047] (2) Use the inoculation loop to inoculate the colonies of Paracoccus FSTB-2, Kitamibacterium FSTB-4 and Pseudomonas stutzeri FSTB-5 on the plate into the corresponding FSTB liquid culture medium respectively, and use the inoculation loop to Take the colonies of Paracoccus denitrificans DN-3 and Methylobacterium SDN-3 on the plate and inoculate them in the corresponding liquid culture medium respectively, and cultivate them for 24-72 hours at a temperature of 20-40°C and 150-240rpm until logarithmic growth period, to obtain liquid bacterial agent seed liquid;

[0048] (3) After ...

Embodiment 1

[0052] The average concentration of each pollutant in a high-salt industrial wastewater is: COD is 75 mg / L, total hardness (as CaCO 3 Calculated) is 1000mg / L, total alkalinity (as CaCO 3 (calculated) is 400 mg / L, silicon dioxide is 30 mg / L, and TDS is 5000 mg / L, among which, the concentration of nitrate ion is 70 mg / L, the concentration of chloride ion is 700 mg / L, and the concentration of sulfate ion is 1000 mg / L, the pH value is 7.8. Such as figure 1 As shown, using the zero-discharge treatment process for coal chemical industry saline wastewater includes the following steps:

[0053] (1) Salt-containing wastewater enters the high-density clarification tank. According to the water quality of the saline wastewater, 1.8g / L of calcium hydroxide is added to the reaction zone of the high-density clarification tank to maintain the pH value at 11.0-11.5, and then add 2.4 g / L sodium carbonate, then add 50 mg / L PFS for coagulation and 4 mg / L PAM to aid coagulation. After fully c...

Embodiment 2

[0062] The average concentration of each pollutant in a high-salt industrial wastewater is: COD is 78 mg / L, total hardness (calculated as CaCO 3 Calculated) is 1200mg / L, total alkalinity (as CaCO 3 (calculated) is 500 mg / L, silicon dioxide is 30 mg / L, and TDS is 5500 mg / L, among which, the concentration of nitrate ion is 80 mg / L, the concentration of chloride ion is 700 mg / L, and the concentration of sulfate ion is 1500 mg / L mg / L, the pH value is 7.8.

[0063] Such as figure 1 As shown, using the zero-discharge treatment process for coal chemical industry saline wastewater includes the following steps:

[0064] (1) The saline wastewater enters the high-density clarification tank. According to the water quality of the saline wastewater, 2.0g / L sodium hydroxide is added to the reaction area of ​​the high-density clarification tank to maintain the pH value at 11.0-11.5, and then add 2.5 g / L sodium carbonate, then add 100 mg / L PFS for coagulation and 10 mg / L PAM to aid coagul...

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Abstract

The invention relates to a concentration method for salt-containing wastewater and a recycling method for salt-containing wastewater method. The recycling method comprises the following steps: (1) pretreatment; (2) reverse osmosis treatment; (3) biochemical treatment; (4) electrodialytic concentration; and (5) cyclic crystallization. Compared with the prior art, the recycling method for salt-containing wastewater provided by the invention realizes recycling and zero discharge of wastewater, improves the quality and recovery rate of salt, and achieves recycling of wastewater and comprehensive utilization of crystalline salt; a biochemical unit further removes COD and nitrate ions and reduces difficulties in salt separation; a membrane treatment unit is stable in process, long in operation cycle and low in cost; and the method has good economical performance.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a method for concentrating salty wastewater and a method for resourceful treatment of salty wastewater, in particular to a method for concentrating high-saline wastewater in the coal chemical industry and a method for resourceful treatment. Background technique [0002] Before the final treatment of saline wastewater, in order to improve the economics of the terminal treatment process, concentration treatment is generally required. The methods that can be used for the concentration of saline wastewater include evaporation, forward osmosis, reverse osmosis, electrodialysis, nanofiltration, etc. However, for most saline wastewater, the pollutants are not only salts, but also COD and other pollutants. In addition, the salts in saline wastewater are generally complex components. In order to reduce the difficulty of terminal treatment, they also need to be c...

Claims

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Application Information

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IPC IPC(8): C02F9/14C01D5/16C01D5/18C01D3/14
CPCC01D3/14C01D5/16C01D5/18C02F1/001C02F1/048C02F1/441C02F1/444C02F1/4693C02F1/52C02F1/725C02F1/78C02F3/34C02F3/341C02F5/00C02F9/00C02F2301/08
Inventor 郭志华陈明翔高会杰孙丹凤赵胜楠李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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