Novel zero discharge treatment technology for high salinity wastewater of thermal power plant

Abstract

The invention relates to the technical field of thermal power plant energy and resource recycling and energy conversation and environmental protection, in particular to a novel zero discharge treatment technology for high salinity wastewater of a thermal power plant.According to the technology, by mixing desulfurization wastewater, residue water and circulating cooling sewage water, the floor area of a treatment unit is saved, the acid-base input amount in the treatment process is decreased, the salt concentration of the desulfurization wastewater and the residue water is decreased, and therefore the operation load and treatment cost of a subsequent treatment device are reduced; the water can be reused in a segmented mode to increase the overall reuse rate of reused water and reduce the operation cost according to the treatment characteristics of the combined technology by combining the water using requirements of different workshops in the production process of the power plant.By combining a crystallization and microfiltration device, a disk-tube reverse osmosis device and a mechanical steam recompression device, the high salinity wastewater and the circulating cooling sewage water of the power plant can be completely converted into resources, and true zero discharge is finally achieved.

Description

technical field [0001] The invention relates to the technical fields of thermal power plant energy, resource recycling, energy conservation and environmental protection, and in particular to a new process for zero-discharge treatment of high-salt wastewater in thermal power plants. Background technique [0002] The slag water discharged from thermal power plants and desulfurization wastewater has a high salt content, and its total dissolved solids (TDS) is generally as high as 20,000mg / L, containing heavy metal ions such as Hg, Pb, Cr, Ni, etc., which are easy to cause scaling and have certain corrosiveness , especially for desulfurization wastewater, its Cl - The concentration is as high as tens of thousands of ppm, and the corrosion of metal pipes is serious, thus increasing the difficulty of wastewater treatment and operating costs. At present, most high-salt wastewater from power plants is directly discharged after simple treatment. [0003] The consumption of circulat...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the discharge of circulating cooling sewage in thermal power plants is relatively large, resulting in waste of water resources. In order to solve the above problems, a new zero-discharge treatment process for high-salt wastewater in thermal power plants is provided

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