A method for treating cotton pulp black liquor by electro-catalytic wet oxidation at room temperature and pressure

Abstract

The invention provides a method for normal-temperature normal-pressure electro-catalysis wet-type oxidation treatment on a cotton pulp black liquor. According to the method, organic pollutants on the electrode surface are fast oxidized in a wet-type oxidation system. The method reduces wet-type oxidation temperature and pressure, shortens treatment time, forms a novel electro-catalysis wet-type oxidation technology, effectively reduces a COD value of the black liquor by the combination of electro-catalysis and catalytic wet-type oxidation and realizes decoloring. The waste water treated by the method has greatly improved biodegradability. Through the method, a COD removal rate is 82.6%, a chroma removal rate is 97.8%, and a BOD5 / COD value is improved to 0.5 from less than 0.1.

Description

technical field [0001] The invention relates to the treatment of high-concentration refractory cotton pulp black liquor. The method of combining electrolysis and catalytic wet oxidation can not only reduce the COD value of wastewater, but also effectively decolorize and improve the biodegradability of wastewater, which is beneficial to the subsequent biochemistry of wastewater. deal with. Background technique [0002] Due to the abundant cotton linter resources in my country, in the production of chemical fiber pulp in my country, cotton linters are mainly used as raw materials for various fiber products, and a large amount of cooking alkaline black liquor will be produced in the pulp production process. The COD value is high, the chroma is large, it is strongly alkaline, and it is difficult to biodegrade. The realization of comprehensive treatment is the focus of scholars' attention and research. In view of the characteristics of poor biodegradability and difficult degradat...

AI Technical Summary

Problems solved by technology

However, although the traditional wet oxidation method has a good treatment effect on high-concentration and refractory organic wastewater, it has some shortcomings that limit its practical application: (1) high requirements for equipment materials, It must be resistant to high temperature and high pressure and corrosion, which makes the equipment investment and maintenance costs large; (2) The reaction is carried out under high temperature and high pressure, and the system needs to maintain high temperature and high pressure conditions. Therefore, wet oxidation is only suitable for small flow and high concentration wastewater treatment , it is very uneconomical for low-concentration and large-volume wastewater treatment

Therefore, according to the characteristics of cotton pulp black liquor, there is still no relatively mature and economical treatment process and method, and it is difficult to meet the discharge standards.

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