摘要
本研究开展了印染废水臭氧氧化影响因素、降解动力学和淬灭实验,测定了自由基物种、降解产物和琥珀酸脱氢酶活性.结果表明,苯胺去除效率随着pH值、臭氧投加量和臭氧投加速率的增加分别逐渐减小、增加和减小,且臭氧浓度为24 mg·L^(-1)时苯胺去除效率最高.臭氧氧化苯胺的适宜条件为:臭氧浓度为24 mg·L^(-1)、臭氧投加量为200 mg·L^(-1)和臭氧投加速率为4 mg·min^(-1),此时苯胺的去除效率为47.2%.臭氧氧化苯胺是直接氧化为主结合羟基自由基反应的作用过程.苯胺脱氨基和裂解苯环后生成戊二酸或L-焦谷氨酸直至矿化.大肠杆菌在原水和臭氧氧化后废水中的酶抑制率分别为83.4%和24.7%.臭氧氧化前处理后,混凝去除色度、SS、COD、总氮、总磷、硫化物和苯胺的效能分别提高了0.72%、0.46%、31.40%、9.40%、22.80%、31.40%和63.30%.研究结果为臭氧氧化印染工业园废水前处理的应用提供了基础依据.
In this study,the influencing factors of ozonation treatment of printing and dyeing wastewater were carried out,and the free radical species,degradation products and succinate dehydrogenase activity were measured.results showed that the aniline removal efficiency decreased with the increase of pH,and increased with ozone dosage,respectively.the aniline removal efficiency was the highest at ozone concentration of 24 mg·L^(-1).The suitable condition for ozonation of aniline was pH 7.0,24 mg·L^(-1),200 mg·L^(-1),and 4 mg·min^(-1).At this time,the removal efficiency of aniline was47.2%.Ozonation of aniline was a reaction process of direct oxidation with hydroxyl radical.After deamination of aniline and the cleavage of benzene ring,glutaric acid or L-pyroglutamic acid was generated until mineralization.The enzyme inhibition rate of E.coli.in raw water and ozonated wastewater were 83.4%and 24.7%,respectively.After ozonation pretreatment,the removal efficiency of chroma,SS,COD,TN,TP,sulfide,and aniline through coagulation increased by 0.72%,0.46%,31.40%,9.40%,22.80%,31.40%and 63.30%,respectively.This study provided a basis for the application of ozonation in printing and dyeing wastewater treatment.
作者
罗新浩
胡勇有
陈元彩
程建华
LUO Xinhao;HU Yongyou;CHEN Yuancai;CHENG Jianhua(School of Environment and Energy,South China University of Technology,Guangzhou 510006;The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters,Ministry of Education,Guangzhou 510006)
出处
《环境科学学报》
CAS
CSCD
北大核心
2022年第12期12-21,共10页
Acta Scientiae Circumstantiae
关键词
印染工业园废水
苯胺
复合污染
臭氧氧化
生物毒性
wastewater from printing and dyeing industrial park
aniline
compound pollution
ozonation
biological toxicity
