Method for processing printing and dying wastewater

Abstract

The invention discloses a technology of processing printing and dying wastewater and particularly relates to a technology of processing the printing and dying wastewater by effectively utilizing sunlight on the basis of a nano photocatalysis technology. Particularly, the method for processing the printing and dying wastewater comprises the following steps of: firstly filtering the printing and dying wastewater by a filtering screen to remove block dirt so as to prevent generating catalyst from poisoning and prolong the service life of a catalyst; then regulating the PH of the printing and dying wastewater by sodium hydroxide; adding a photochemical catalyst into the printing and dying wastewater and simultaneously leading sunlight into the printing and dying wastewater; and carrying out sunlight irradiation for over 3 hours under the conditions of stirring, blowing air and supplying oxygen. In the invention, the photocatalysis technology is used for processing the printing and dying wastewater; secondary pollution is effectively avoided; the method is energy-saving and environmentally friendly; the used catalyst can simultaneously utilize both the ultraviolet band and the visible light band in sunlight and has high sunlight utilization rate and catalyzing efficiency; and the COD (chemical oxygen demand), the BOD (biochemical oxygen demand) and the chroma removal rate of the printing and dying wastewater can achieve 99 percent.

Description

Technical field [0001] The invention discloses a printing and dyeing wastewater treatment technology, and in particular relates to a technology based on nano photocatalysis technology that can efficiently utilize sunlight to treat printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater has complex components, dark color, and large discharge volume. It has always been one of the most difficult industrial wastewater at home and abroad. People spend a lot of material and financial resources to solve this difficult problem for this reason. The current treatment methods for printing and dyeing sewage mainly include biochemical methods, electrolysis methods, and photocatalytic methods. The biochemical method occupies a large area, has a narrow scope of application, and the effect is not ideal; although the electrolysis method is better than the biochemical method, it consumes a lot of energy and is difficult to popularize. Photocatalysis has ...

AI Technical Summary

Problems solved by technology

The treatment of printing and dyeing wastewater with flocculants is still effective for the precipitation of suspended solids, but the effect of reducing COD, BOD and chroma is not ideal, especially the deodorization effect is even worse, and it will also cause secondary pollution, which cannot be fundamentally solve the pollution problem