Method for treating dyeing wastewater and dedicated device

Abstract

The invention provides a method for treating dyeing wastewater and a dedicated device. The method comprises the following steps of treatment under the automatic control of a central control unit: A, discharging the dyeing wastewater which is uniform quality and uniform quantity into a flocculation precipitating tank, and adding coagulating agent and flocculating agent to the flocculation precipitating tank so as to precipitate the suspended substance and part of organic substances; B, discharging the clear liquid of the wastewater in step A into a hydrolytic acidification tank, and decomposing the macromolecular organic substances in the wastewater into micro molecular substances under the action of facultative anaerobe; C, discharging the wastewater in step B into a contact oxidation tank, feeding air into the contact oxidation tank and decomposing the organic substances in the wastewater under the action of aerobe; D, discharging the wastewater in step C into a membrane bioreactor, and entrapping and decomposing the stale biological membrane slag and the residual organic substances by the membrane bioreactor; and E, sucking the clear water in step D into a clean water tank and discharging the sludge in the membrane bioreactor into the hydrolytic acidification tank or the contact oxidation tank respectively through a return sludge pump by the concentration of the sludge. The invention has the advantages that the treatment cost is low and the treated water is recyclable, thereby helping enterprises to achieve the purposes of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to a wastewater treatment method and a special device, in particular to a membrane treatment method and a special device for printing and dyeing wastewater. Background technique [0002] Since the 1990s, a wastewater treatment technology combining membrane separation technology and bioreactor has been widely studied in Japan, the United States and other countries, and has been gradually applied. Membrane-bioreactor is different from conventional biotechnology and membrane separation technology, but a new technology that combines ultrafiltration technology in membrane separation engineering with traditional biological treatment. It uses the separation and interception function of the polypropylene hollow fiber membrane module to continuously return the activated sludge, macromolecules, and refractory substances in the bioreactor to the reactor to improve the efficiency of biochemical reactions. [0003] The treatment of printing a...

AI Technical Summary

Problems solved by technology

At present, the membrane bioreactors on the market must meet the recycling standard for printing and dyeing wastewater, some of which have to undergo complex pre-treatment, and some have to be combined with electrolytic treatment, ultrasonic treatment, etc., resulting in high processing costs and low processing capacity.

In addition, the cleaning of the membrane is done with drugs, clean water and ultrasonic cleaning, and directly introduces impurities and organic matter into the wastewater, which increases the difficulty of treatment and causes secondary pollution.

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