Combined filtrating system and method for advanced treatment of dyeing wastewater

Abstract

The invention relates to a combined filtration system for advanced treatment of printing and dyeing wastewater and a method, the system comprises a micro-flocculate deep-bed filtration subsystem and an ultrafiltration membrane filtration subsystem, and the method comprises pumping the printing and dyeing wastewater inside a raw water tank (2) into a pipeline mixer (15) to be sufficiently mixed with flocculating agent and oxidant, discharging mixed water into a water storage tank (25) after being filtered and purified via a fiber ball filter (10), then filtering by a pressure pump (41) via an ultrafiltration membrane component (47) and finally discharging water into a clear water tank (55). The process of the invention is simple in flow, small in accommodation area and low in investment and operation cost, and not only can effectively removing contaminants as chroma, turbidity, TOC, ammonia nitrogen and the like from the wastewater, but also takes the micro-flocculate deep-bed filtration subsystem as a pretreatment process of ultrafiltration, thereby largely reducing load of the ultrafiltration membrane and reducing chances of membrane fouling. Therefore, the combined filtration system for advanced treatment of printing and dyeing wastewater and the method have wide application prospect in advanced treatment field of the printing and dyeing wastewater.

Description

technical field [0001] The invention relates to a method for advanced treatment of printing and dyeing wastewater, in particular to a method for advanced treatment of printing and dyeing wastewater by a combined filtration system combining a micro-flocculation deep bed filtration subsystem and an ultrafiltration membrane filtration subsystem. Background technique [0002] Printing and dyeing wastewater has the characteristics of large water volume (wastewater volume is about 70-90% of water consumption), high chroma and organic matter content, large changes in water quality and pH value, complex components, etc. In addition, the wastewater also contains residual dyes, slurry, auxiliary Chemicals, fiber impurities, and inorganic salts, etc., especially contain difficult-to-degrade substances and a small amount of toxic substances, which belong to wastewater with poor biochemical properties. [0003] The shortage of water resources and the discharge of pollutants have become r...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for advanced treatment of printing and dyeing wastewater by a combined filter system, so as to solve the shortcomings of the prior art such as large floor area, high investment and operation costs, and complicated operation and management, and realize effective purification of printing and dyeing wastewater. To achieve the effect of partial recycling

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