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Resource-converting utilization method for desulfuration wastewater

A technology for desulfurization and recycling of wastewater, applied in chemical instruments and methods, gaseous discharge wastewater treatment, water/sewage treatment, etc. It can solve the problem of limited resource utilization, secondary pollution, poor stability and solidification It can solve the bottleneck problem of wastewater pollution, realize regeneration and recycling, and achieve the effect of good economic benefits.

Inactive Publication Date: 2017-08-29
瑞盈环保科技(扬州)有限公司
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Problems solved by technology

These miscellaneous salts are extremely soluble, poor in stability and solidification, and can seep out with the rain, causing secondary pollution
At present, there are few ready-made hazardous waste treatment centers that can receive these miscellaneous salts, and the resource utilization methods are also very limited.

Method used

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  • Resource-converting utilization method for desulfuration wastewater

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[0034] Desulfurization wastewater from thermal power plants: PH is 4~6, showing weak acidity; the water contains more suspended solids, fluoride, chloride, sulfate and heavy metal ions (lead, cadmium, chromium, nickel, mercury, zinc, etc.)

[0035] Step 1: Filter the desulfurization wastewater, adjust the pH of the filtered filtrate to 12, add an iron-based coagulant, coagulate and flocculate to remove weight, and then filter.

[0036] Step 2: After adjusting the pH value of the filtrate to 6-8 with HCl, put the solution in an electrolytic cell without a diaphragm, and use a mesh flat Ti / PbO 2 The oxide coating is the electrolytic anode, and the stainless steel material is the cathode. Note that the area of ​​the cathode and anode is one to one. Perform electrolysis at room temperature with a constant current density of 50 Ma / cm 2 , Electrolyzed to COD less than 10ppm.

[0037] Step 3: The light brine with COD reduced to below 10ppm is concentrated to more than 15% by revers...

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Abstract

The invention relates to a resource-converting utilization method for desulfuration wastewater. The method comprises the steps: converting saline matters in the desulfuration wastewater into sodium chloride, and meanwhile, obtaining light salt brine containing organic matters; removing organic matter impurities from the light salt brine, and then, concentrating the light salt brine so as to prepare electrolytic brine; and recycling plain water obtained after membrane separation as fresh water. The method has the advantages that the desulfuration wastewater is applied as a resource, and three kinds of products, i.e., alkali, ferric chloride and water are obtained while the wastewater is treated, so that the method has very good economic, environmental and social benefits. By the popularization and application of the method, the bottleneck problem, i.e., wastewater pollution of a desulfuration wastewater production process can be thoroughly solved.

Description

technical field [0001] The invention relates to a method for resource utilization of desulfurization wastewater, which belongs to the field of desulfurization wastewater treatment. Background technique [0002] The shortage of water resources in our country, the lack of water resources and pollution problems have become the key factors restricting the development of national economy and social progress. Thermal power plants are the main force of my country's electric power industry, but they are also large dischargers of industrial water and industrial wastewater. With the serious shortage of water resources and the increasing environmental pollution, wastewater treatment and its recycling have become an important science to be solved urgently in thermal power plants. problems and technical difficulties. [0003] China has more than 1,000 state-owned large-scale thermal power plants, more than 100 large-scale coal chemical enterprises, and a large number of self-owned power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/18
CPCC02F9/00C02F1/001C02F1/04C02F1/441C02F1/4672C02F1/5236C02F1/66C02F2103/18
Inventor 姚来祥邱伟平姜满兰
Owner 瑞盈环保科技(扬州)有限公司
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