Chlorine dioxide bleaching process for reducing content of organic chloride in waste water

Abstract

The invention provides a chlorine dioxide bleach method for reducing the content of organic chlorine in effluent. The method is a technology of reducing the content of organic chlorine in element free chlorine (ECF) bleaching effluent and improving the performance of a bleaching pulp, belongs to the papermaking technical field and mainly comprises the following steps of: 1) adding aminosulfonic acid or DMSO addition agent under an appropriate chlorine dioxide bleach technique; 2) bleaching wood pulp and bleaching deoxidation sulfate wood pulp in the presence of NaOH, CIO2 and the addition agent; 3) conducting subsequent totally chlorine-free (TCF) wood pulp bleach and then conducting subsequent two-stage bleach ( a chelated treatment stage and a hydrogen bleach stage) treatment on the bleached wood pulp. The method is easy to operate, has obvious effect, can reduce the content of organic chlorine in DQP bleaching effluent and improve the performance criterions of DQP bleaching paper pulp such as whiteness and tensile index, etc.

Description

A chlorine dioxide bleaching method for reducing organic chlorine content in waste water technical field The invention relates to a chlorine dioxide bleaching method for reducing the organic chlorine content of waste water, and is a novel technology for reducing the organic chlorine content of elemental chlorine-free (ECF) bleaching waste water and improving the performance of bleached pulp. Background technique Due to the requirements of environmental protection and the development of bleaching technology, chlorine dioxide, as a highly efficient and less polluting bleaching agent, has been widely used in the pulp bleaching industry. Compared with traditional chlorine and hypochlorite bleaching, chlorine dioxide bleaching has the advantages of good delignification selectivity and high pulp whiteness strength. In order to further improve the bleaching efficiency, bioenzyme pretreatment chlorine dioxide bleaching, high-temperature chlorine dioxide bleaching and other techno...

AI Technical Summary

Problems solved by technology

In order to further improve the bleaching efficiency, technologies such as biological enzyme pretreatment chlorine dioxide bleaching and high-temperature chlorine dioxide bleaching have been studied in depth and extensively, but the current situation of high organic chlorine content in chlorine dioxide bleaching wastewater has not changed, and the toxicity of wastewater remains. higher