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Zero-discharge treatment method for salt-containing coal-chemical wastewater

A technology of salt-containing wastewater and a treatment method is applied in the field of zero-discharge treatment of salt-containing wastewater and zero-discharge treatment of high-salt wastewater in coal chemical industry, which can solve the problems of inability to achieve zero discharge, ineffective integration of functions, and high cost, and achieve The effect of reducing processing cost, reducing processing difficulty, and low cost

Active Publication Date: 2018-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Zero-discharge treatment method for salt-containing coal-chemical wastewater
  • Zero-discharge treatment method for salt-containing coal-chemical wastewater

Examples

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Embodiment 1

[0052] The average concentration of each pollutant in high-salt industrial wastewater is: COD is 80 mg / L, total hardness (as CaCO 3 Calculated) is 1500mg / L, total alkalinity (as CaCO 3 (calculated) is 800 mg / L, silicon dioxide is 30 mg / L, and TDS is 5000 mg / L, among which, the concentration of nitrate ion is 40 mg / L, the concentration of chloride ion is 700 mg / L, and the concentration of sulfate ion is 1000 mg / L. mg / L, pH value is 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) The salty wastewater enters the high-density clarifier. According to the water quality of the saline wastewater, 1.8g / L calcium hydroxide is added to the reaction zone of the high-density clarifier to maintain the pH value at 10.5-11.0, and then add 2.0 g / L L sodium carbonate, then add 10 mg / L PFS for coagulation, 1mg / L PAM to aid coagulation, after fully coagulating in the reaction area, ...

Embodiment 2

[0063] Such as figure 1 As shown, utilizing the zero-discharge treatment process for coal chemical industry saline wastewater treatment process to treat the same wastewater as in Example 1 includes the following steps:

[0064] (1) The saline wastewater enters the high-density clarification tank. According to the water quality of the saline wastewater, 1.8g / L 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 2.5 g / L L sodium carbonate, then add 50 mg / L PFS for coagulation, 5mg / L PAM to aid coagulation, after fully coagulating in the reaction area, enter the clarification area of ​​the high-density tank for sedimentation, and finally put it at the outlet of the high-density clarification tank Add hydrochloric acid or sulfuric acid to adjust the pH to about 7, and add non-oxidizing bactericide to prevent membrane fouling. After treatment, the hardness of the effluent from the high-density c...

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Abstract

The invention relates to a zero-discharge treatment method for salt-containing coal-chemical wastewater. The method comprises the following steps: (1) pretreatment; (2) reverse osmosis treatment; (3)advanced oxidation; (4) biochemical treatment; (5) electrodialytic concentration; and (6) cyclic crystallization. Compared with the prior art, the zero-discharge treatment method for salt-containing wastewater provided by the invention achieves zero discharge or almost zero discharge of coal chemical wastewater, improves the recovery rate of salt, can recover high-quality sodium sulfate, mirabilite and sodium chloride and realizes recycling of crystalline salt; 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 in particular relates to a zero-discharge treatment method for saline wastewater, in particular to a zero-discharge treatment method for high-salt wastewater in the coal chemical industry. Background technique [0002] Coal chemical industry is a process in which coal is used as raw material and converted into gas, liquid, solid fuel and chemicals through chemical processing. Coal chemical industry mainly includes coal gasification, liquefaction, dry distillation, tar processing and calcium carbide acetylene chemical industry. Coal chemical projects consume a lot of water and generate a lot of wastewater. However, most of the coal chemical projects in my country are distributed in the northwest region where water resources are scarce and sewage receiving bodies are lacking. With the continuous adjustment of national environmental protection policies, the waste water of coal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36
CPCC02F1/001C02F1/04C02F1/441C02F1/444C02F1/4693C02F1/5236C02F1/56C02F1/66C02F1/722C02F3/12C02F9/00C02F2103/36C02F2301/08C02F2305/026
Inventor 孙丹凤陈明翔高会杰赵胜楠郭志华郭宏山
Owner CHINA PETROLEUM & CHEM CORP
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