Efficient treatment process for printing and dyeing waste water

Abstract

The invention discloses an efficient treatment process for printing and dyeing waste water. In the invention, after printing and dyeing waste water is homogenated by a regulating tank and preaerated by a preaeration tank, the printing and dyeing waste water enters a primary precipitating tank to be precipitated; the precipitated waste water enters an oxygen deficiency or an aerobic membrane bioreactor to be treated, and chemical flocculants and biological microcarrier with an absorption function are thrown into an oxygen deficiency zone of the membrane bioreactor; waste water mixture liquid enters an aerobic zone from the oxygen deficiency zone, and is separated by a membrane assembly in the aerobic zone; clean water realizes standard discharge after being filtered by the membrane assembly, and biochemical or materialized mud with high concentration in the aerobic zone respectively returns to the oxygen deficiency zone and the preaeration tank; the biochemical or materialized mud returning to the oxygen deficiency zone is continuously recycled in the membrane bioreactor; and after the biochemical or materialized mud returning to the preaeration tank mixes with the homogenated printing and dyeing waste water for biochemical or materialized absorption and flocculation, the biochemical or materialized mud returning to the preaeration tank enters the primary precipitating tank to be precipitated, and the precipitated mud is discharged out of the system. The invention is not only applicable for the treatment of printing and dyeing waste water, and is also suitable for the treatment of other difficultly degraded waste water.

Description

technical field [0001] The invention relates to a treatment process for printing and dyeing wastewater, and is also applicable to the treatment of other refractory wastewater. Background technique [0002] Membrane bioreactor (MBR) is a new water treatment technology combining membrane separation technology and activated sludge method. Due to the high-efficiency interception effect of the membrane, the microorganisms are completely trapped in the bioreactor, realizing the complete separation of the hydraulic retention time and the sludge retention time, and eliminating the sludge bulking problem of the traditional activated sludge process. The technology research began in the late 1960s, and developed rapidly in the middle and late 1980s, and various types of membrane bioreactors appeared. In foreign countries, some membrane bioreactors have entered the practical stage. For example, Japan uses them for the treatment of domestic sewage and reuses purified water as reclaimed ...

AI Technical Summary

Problems solved by technology

4) Long mud age

Second, the phosphorus removal effect of the membrane bioreactor is limited, and it is difficult to meet the "Discharge Limits of Major Water Pollutants from Urban Sewage Treatment Plants and Key Industries in the Taihu Lake Area" only through biological sludge discharge

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