METHOD AND APPARATUS FOR REDUCING SECONDARY POLLUTION AND RECOVERING WATER FROM WASTEWATER AND FINISHING WATER FOR REUSE

摘要

The present invention relates to a method and apparatus for reducing secondary pollution and recovering dyeing and finishing waste water for reuse. A wastewater recovery device comprises a bypass control unit, a sieving module, a pH value adjusting module, a coagulation and skimming module, a cooling unit, a decomposition module and removal of microorganisms, an ion filtration unit and an evaporation unit. The bypass controller collects dyeing and finishing water and distinguishes highly polluted water from low polluted water, and then filters out insoluble foreign matter from highly polluted water and low water. Polluted, respectively, mixes pollutants uniformly and adjusts the acid-base. The coagulation and skimming module eliminates suspended solids (SS) from the water and reduces the chromaticity of the water. The cooling unit lowers the temperature of the water, and as soon as the water cools down, decomposes the microorganisms and removes residual microorganisms from the water. Highly polluted wastewater is treated and tested to comply with emission standards before being discharged, while lightly polluted wastewater is treated and tested to comply with recovery standards before being recovered from wastewater. for reuse. In addition, to improve the quality of the recovered water, lightly polluted wastewater is treated with an ion filtration unit and an evaporation unit to remove crystalline pollutants and to eliminate the amount of total dissolved solids (BATs). ) before the wastewater is discharged.