摘要
本研究分析了竹浆无元素氯(ECF)漂白废水的污染特性,对废水急性毒性进行了评价,并探讨了Ti/IrO_(2)-RuO_(2)涂层电极电化学氧化法对废水中毒性有机氯化物的降解效果。水质分析结果表明,竹浆ECF漂白废水的污染负荷主要来源于D_(0)段,其中化学需氧量(COD)负荷及可吸附有机氯化物(AOX)的发生量分别占漂白废水总量的71.8%和73.4%;D_(0)段和Eop段的EC_(50)分别为27.7%和44.4%,废水急性毒性级别属中毒水平,有机氯化物是废水毒性的主要来源。采用Ti/IrO_(2)-RuO_(2)电化学处理漂白废水,在外加电压7.0 V和电解时间240 min的条件下,D_(0)段、Eop段和D_(0)+Eop混合段废水的COD_(Cr)去除率分别可达57.7%、 37.5%和43.5%,色度去除率分别为90.2%、 82.3%和83.1%;D_(0)段、D_(0)+Eop混合段废水及Eop段毒性级别也分别从中毒降到低毒和无毒,AOX去除率分别达66.3%、70.2%和100%,表明Ti/IrO_(2)-RuO_(2)电化学处理漂白废水可大大降低废水污染负荷,并能取得较好的脱毒效果。
In this study,the pollutant characteristics from element chlorine free(ECF)bleaching bamboo pulp were analyzed,the acute tox⁃icity of the wastewater was comprehensively evaluated,and the degradation of toxic organic chloride in wastewater was also discussed by Ti/IrO_(2)-RuO_(2) coating electrode.Wastewater characteristic analysis showed that the pollutants were mainly generated in D_(0) stage of ECF bleach⁃ing process,contributing chemical oxygen demand(COD)and absorbable organic halogen(AOX)71.8%and 73.4%respectively,and its acute toxicity(EC_(50) of 27.7%)was slightly more than Eop wastewater(EC_(50) of 44.4%),but both of which were in the moderate toxicity grade,organic chlorides played more tribute to wastewater’s toxicity.The results showed the pollution load of wastewater from ECF bleach⁃ing bamboo pulp was greatly decreased with Ti/IrO_(2)-RuO_(2) coating electrode oxidization.With the conditions of voltage 7.0 V and the electrol⁃ysis time 240 min,the COD_(Cr) removal rate of wastewater from D_(0) stage,Eop stage and the mixed wastewater of D_(0) and Eop were 57.7%,37.5%and 43.5%,the decolored rate were 90.2%,82.3%and 83.1%respectively.And better toxic organic chloride(AOX)degradation efficiencies were 66.3%,70.2%and 100%respectively,the toxicity grade reached low toxicity from moderate toxicity,and the Eop waste⁃water indicated non-toxic level.
作者
景立明
刘爽
艾爽
党一迪
马兰
JING Liming;LIU Shuang;AI Shuang;DANG Yidi;MA Lan(College of Environmental Science and Engineering,Shannxi University of Science&Technology,Xi’an,Shaanxi Province,710021;China Light Industry Water Pollution Control Engineering Center,Xi’an,Shaanxi Province,726300;Water Conservancy Bureau of Shangnan County,Shangluo,Shaanxi Province,726399;Xinjiang Municipa Research Institute of Environmental Protection,Urumqi,Xinjiang Uygur Autonomous Region,830000)
出处
《中国造纸》
CAS
北大核心
2023年第10期85-92,共8页
China Pulp & Paper
基金
陕西省重点研发计划项目(项目编号:2020SF-406)。
关键词
无元素氯漂白
可吸附有机氯化物
电化学
毒性评价
竹浆
element chlorine free bleaching
absorbable organic halogen
electrochemical oxidation
toxicity evaluation
bamboo pulp
