Power plant desulfurization waste water membrane concentrating process and equipment

Abstract

The invention discloses a power plant desulfurization waste water membrane concentrating process. The process comprises the step that water quantity and water quality of desulfurization waste water are adjusted in an adjusting tank, and the adjusted desulfurization waste water is reacted with lime in a first reaction tank, enters a second reaction tank in a coagulation fluid state to be reacted with sodium carbonate and then enters a concentrating water tank in a coagulation fluid state; waste water in the concentrating water tank is lifted to a UF membrane component, filtered contributing water enters a neutralizing tank, the pH value of the contributing water is adjusted through industrial hydrochloric acid, and concentrated water flows back to the concentrating water tank; ultra-filtered contributing water with the pH value adjusted in the neutralizing tank is pumped to a first-stage RO membrane component to be concentrated through a pump, obtained concentrated water is pumped into a second-stage RO membrane component through a pump, concentrated water enters an evaporator, the contributing water of the second-stage RO membrane component flows back to the first-stage RO membrane component to be treated, and the contributing water of the first-stage RO membrane component and evaporator condensate water are recycled for slurry mixing of production process agents. The invention discloses power plant desulfurization waste water membrane concentrating equipment. By means of the power plant desulfurization waste water membrane concentrating process and equipment, the concentrating effect of the desulfurization waste can be improved, the chemical agent and operating cost can be reduced, and the zero-release requirement can be met.

Description

technical field [0001] The invention relates to the technical field of desulfurization wastewater treatment in power plants, in particular to a membrane method concentration process and equipment for desulfurization wastewater in power plants. Background technique [0002] In the desulfurization technology of thermal power generation, the limestone / gypsum wet flue gas desulfurization process technology is mature and widely used, but when desulfurization is carried out by this method, a part of the absorption tower slurry will be discharged as desulfurization wastewater. Desulfurization wastewater contains a large amount of suspended solids, Cl - , F - , SO 4 2- , Ca 2+ , Mg 2+ and other substances, while containing trace amounts of heavy metal ions, highly polluting. [0003] In the prior art, the conventional treatment method for power plant desulfurization wastewater is chemical precipitation, which is relatively simple to operate, but the effect is unstable, the flo...

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[0005] The application number is 201310112212.4, which discloses a limestone and gypsum wet desulfurization wastewater treatment device, including a sedimentation system, an ultrafiltration system, a reverse osmosis system, a cleaning device, and a flushing device. It does not soften the desulfurization wastewater with high hardness, and subsequent reverse osmosis membrane pollution Serious, and the reverse osmosis product water is not used

[0006] The application number is 201410240730.9, which discloses a desulfurization wastewater recycling and zero discharge system and method. The desulfurization wastewater is separated into salt through the nanofiltration device, and the nanofiltration concentrated water is directly returned to the desulfurization tower for recycling. Osmosis, electrodialysis, crystallization combined process for recycling, the treatment cost is relatively high

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