两段吸附法处理联苯胺生产废水及资源回收方法技术

本发明专利技术公开了一种两段吸附法处理联苯胺生产废水及资源回收的方法。首先将联苯胺生产废水ｐＨ值调至４－７，通过第一段复合功能树脂进行吸附处理和回收邻氯苯胺，吸附出水ｐＨ值再调至７－１０，通过第二段复合功能树脂进行吸附处理，处理后ＣＯＤ可降至５００ｍｇ／Ｌ以下，邻氯苯胺含量低于５ｍｇ／Ｌ。第一段复合功能树脂可以通过ＨＣｌ水溶液进行完全脱附，得到的高浓度脱附液经ＮａＯＨ水溶液中和处理后可分离回收纯度高达９８％的邻氯苯胺。第二段复合功能树脂经同样方法再生，高浓度脱附液可用于配制第一段树脂用脱附剂。削减了废水排入环境的有机污染物，ＣＯＤ去除率＞９１％，有机污染物去除率＞９８％，同时实现了有机污染物的资源回收利用，在联苯胺生产废水污染控制方面具有显著的经济价值和环境效益。

Two stage adsorption process for treating benzidine production wastewater and resource recovery method

The present invention discloses a two stage adsorption process for treating benzidine production wastewater and resource recovery method. The benzidine wastewater pH value to 4 - 7, adsorption treatment and recovery of o-chloroaniline through the first section of composite resin adsorption effluent pH and then transferred to 7 - 10, was dealt by second sections of composite resin after the treatment of COD can be reduced to 500mg / L, o-chloroaniline content less than 5mg / L. The first composite functional resin can be completely desorbed by HCl aqueous solution, and the high concentration desorption solution can be recovered by neutralization in NaOH water solution to recover ortho chloro aniline with purity as high as 98%. The second stage composite functional resin is regenerated by the same method, and the high concentration desorption liquid can be used for preparing the first resin stripping agent. Cut the organic pollutants of wastewater discharged into the environment, the removal rate of COD was 91%, the removal rate of organic pollutants is more than 98%, while achieving the recycling of organic pollutants using, has significant economic value and environmental benefits in the production control of benzidine wastewater pollution.

【技术实现步骤摘要】

【技术保护点】
一种两段吸附法处理联苯胺生产废水及资源回收的方法，其步骤包括：（Ａ）联苯胺生产废水进入第一段树脂吸附塔前，调整ｐＨ值为４～７；废水从第一段吸附塔出来后进入第二段树脂吸附塔前调整ｐＨ值为７～１０；（Ｂ）将废水经ｐＨ调整后分别以 １～５ＢＶ／ｈ和５～１５ＢＶ／ｈ的流量通过两段树脂吸附塔；（Ｃ）用脱附剂将吸附了邻氯苯胺的吸附树脂进行脱附再生。

【技术特征摘要】

【专利技术属性】
技术研发人员：刘福强，赵卫伟，荆晓生，朱兆连，李爱民，陈金龙，
申请(专利权)人：南京大学，江苏南大戈德环保科技有限公司，
类型：发明
国别省市：84[中国|南京]