Advanced treatment system and method for textile printing and dyeing sewage

Abstract

The invention discloses an advanced treatment system and method for textile printing and dyeing sewage. The treatment system comprises a pretreatment tank, a hydrolysis acidification tank, an anaerobic-anoxic-aerobic tank, an MBR membrane tank, an ozone contact oxidation tank and a biological filter tank which are sequentially connected through pipelines; the pretreatment tank is connected with awater inlet pipe; the ozone contact oxidation tank is connected with an O3-oxygen-enriched air mixed gas generation device; a tail gas recycling device connected through a pipeline is arranged betweenan aerobic tank in the anaerobic-anoxic-aerobic tank and the ozone contact oxidation tank; the biological filter tank is connected with a drain pipe. The treatment method comprises the following operations: pretreatment, hydrolytic acidification, anaerobic treatment-anoxic treatment-aerobic treatment, MBR membrane enhanced biochemical treatment and filtration, contact oxidation and biological filtration. The advanced treatment system and method for the textile printing and dyeing sewage are good in COD removal effect and low in treatment cost, and treated water can be directly discharged or recycled as reclaimed water.

Description

technical field [0001] The invention relates to a textile printing and dyeing sewage advanced treatment system and method, belonging to the technical field of sewage treatment. Background technique [0002] The textile printing and dyeing industry has a large amount of water and sewage discharge. Under the restrictive conditions of water scarcity and increasingly stringent ecological environment protection, the survival and normal production of textile printing and dyeing enterprises are facing severe challenges. The sewage of textile printing and dyeing enterprises is characterized by high pollutant concentration, specifically manifested as high COD, high chroma, high suspended solids content, high pH value, and also contains a certain amount of COD that cannot be biochemically treated. In addition, textile printing and dyeing enterprises discharge in different time periods The water quality and quantity of the sewage vary greatly, and the treatment is difficult. It is dif...

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Problems solved by technology

[0005] 2) Biological treatment process enhanced by MBR membrane technology: combine MBR membrane bioreactor with biochemical process, take advantage of the advantages of MBR process, such as high volume load, small footprint, long SRT, etc., to improve the ability of biochemical system to withstand the impact of water quality changes, For example: CN 109534598A discloses this process. Although this process belongs to the enhanced process of biochemical process, it cannot effectively remove the non-biochemical COD in textile printing and dyeing sewage. The treated sewage still has a certain chroma and high COD, so it needs to enter Secondary sewage treatment plant for further treatment;

[0006] 3) Biochemical + ozone advanced oxidation process: The advanced ozone oxidation process is widely used in the advanced treatment of textile printing and dyeing wastewater for decolorization and further removal of COD, but the treatment effect of the current advanced ozone oxidation process is affected by the incoming water SS, ozone dosing concentration, etc. Factors have a great influence, in order to achieve a better removal effect, the concentration of ozone dosing is high, and the treatment cost is high

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