Desulfurization wastewater treatment system and method

Abstract

The desulfurization wastewater treatment system is characterized in that a water inlet of a sewage pump is connected with a water collecting tank, and a water outlet of the sewage pump is connected with a water inlet of a primary sedimentation tank; a water outlet of the primary sedimentation tank is connected with a water inlet of the chemical mixing tank, a water outlet of the chemical mixing tank is connected with a water inlet of the lifting pump, a water outlet of the lifting pump is connected with a water inlet of the cyclone clarifier 4, a water outlet of the cyclone clarifier is connected with a water inlet of the valveless filter, and a water outlet of the valveless filter is connected with a water inlet of the reuse water tank; a discharge hole of the dry powder feeding machine is connected with a water inlet of the medicament mixing tank; and an inlet of the sludge pump is connected with a sludge discharge pipe of the primary settling tank and a sludge discharge pipe of the cyclone clarifier. The wastewater treated by the method can reach the discharge standard of 'Water Quality Control Index for Limestone-Gypsum Wet Desulfurization Wastewater of Thermal Power Plant' DL / T997-2006, and can be reused.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a desulfurization wastewater treatment system and method. Background technique [0002] In the production and design of thermal power plants, desulfurization devices are required. Among various flue gas desulfurization processes, limestone / gypsum wet desulfurization is the most widely used flue gas desulfurization process. The wastewater generated by the limestone / gypsum wet desulfurization process of boiler flue gas comes from the discharge water of the absorption tower. In order to maintain the balance of substances in the slurry circulation system of the desulfurization unit, prevent the soluble part of the flue gas, that is, the chlorine concentration from exceeding the specified value, and ensure the quality of gypsum, a certain amount of wastewater must be discharged from the system. The wastewater mainly comes from the gypsum dehydration and cleani...

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Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides a desulfurization wastewater treatment system and method. The wastewater treated by the present invention can reach the "Water Quality Control Index for Limestone-Gypsum Wet Desulfurization Wastewater in Thermal Power Plants" DL / T997- 2006 discharge standard, it can be reused again, which solves the problems of the existing triple box plus ordinary clarifier treatment process equipment, high operation and maintenance costs, high failure rate, low actual commissioning rate, and the quality of treated water cannot be guaranteed.

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