摘要
以印染废水中溶解性有机物(DOM)为研究对象,重点研究了褶皱角度对三维电极强化活性污泥系统(3D-EAS)处理印染废水的出水水质及DOM去除效果的影响,通过分析系统电化学特征及微生物群落结构演替规律,揭示了3D-EAS对DOM的降解机理.结果表明,褶皱角度为30°时,系统具有最佳处理效果,出水TOC(23.78 mg·L^(-1))与TN(5.14 mg·L^(-1))最低,溶液电阻最小(2.11Ω),DOM的急性毒性由47%削减至8%.不同褶皱角下,各反应器出水急性毒性无显著性差异,但出水DOM的去除特征差异明显.R_(30)(褶皱角度为30°的三维极板)和R_(60)(褶皱角度为60°的三维极板)优先降解富里酸类、腐殖酸类性物质,而R_(90)(褶皱角度为90°的三维极板)和R_(180)(褶皱角180°为无角度极板)优先降解蛋白质类物质、可溶性微生物产物.由DOM分子与急性毒性的斯皮尔曼相关性可知,不饱和高氧类化合物和脂肪类化合物与急性毒性呈负相关.微生物群落结构分析结果发现,褶皱角可显著改变三维电极强化活性污泥系统中微生物群落结构,3D-EAS中的优势菌属为Defluviicoccus、Sphingomonas、OLB14、Cecembia及Streptococcus.在电极褶皱角度的影响下,3D-EAS可以通过提升Bacteroidetes等菌群的丰度,增加高不饱和高氧类DOM分子的生物可降解性,提升Chloroflexi、Actinobacteria和Firmicutes等菌群的丰度,促进稠环芳香烃类、芳香烃类DOM分子的降解,进而提高反应器对DOM的处理效果.
Taking the dissolved organic matter(DOM)in printing and dyeing wastewater as the research object,the effect of fold angle on the effluent quality and DOM removal effect of 3D electrode enhanced activated sludge system(3D-EAS)was studied.The degradation mechanism of DOM by 3D-EAS was revealed by analyzing the electrochemical characteristics of the system and the structure of microbial community.The results showed that the system had the best treatment effect when the fold angle was 30°.And the TOC(23.78 mg·L^(-1)),TN(5.14 mg·L^(-1))and the solution resistance(2.11Ω)of effluent were the lowest,the acute toxicity of DOM was reduced from 47%to 8%.There was no significant difference in the acute toxicity of effluent from each reactor with different folding angles,but the removal characteristics of DOM from effluent were significantly different.The fulvic acid and humic acid substances were preferentially degraded by the R_(30)(3D plate with a fold angle of 30°)and R_(60)(3D plate with a fold angle of 60°),while the proteins and soluble microbial products were preferentially degraded by the R_(90)(3D plate with a fold angle of 90°)and R_(180)(plate with a fold angle of 180°).According to the Spearman correlation between DOM molecules and acute toxicity,unsaturated hyperoxic compounds and fatty compounds had a negative correlation with acute toxicity.It was found that the fold angle could significantly change the microbial community structure in the activated sludge system enhanced by 3D electrode.The dominant bacteria in 3D-EAS were Defluviicoccus,Sphingomonas,OLB14,Cecembia and Streptococcus.The 3D-EAS could increase the biodegradability of highly unsaturated and high-oxygen DOM molecules and the abundance of Chloroflexi,Actinobacteria and Firmicutes bacterial groups with the influence of electrode fold angles,which could promote the degradation of aromatic hydrocarbons and aromatic hydrocarbon DOM molecules.
作者
邢心语
胡海冬
丁丽丽
任洪强
XING Xinyu;HU Haidong;DING Lili;REN Hongqiang(State Key Laboratory of Pollution Control and Resource Reuse,School of Environment,Nanjing University,Nanjing 210023;SINOPEC Dalian Research Institute of Petroleum and Petrochemicals Co.,Ltd.,National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery,Dalian 116045)
出处
《环境科学学报》
CAS
CSCD
北大核心
2023年第3期16-29,共14页
Acta Scientiae Circumstantiae
基金
南京大学卓越研究计划(No.ZYJH005)。
关键词
三维电极
褶皱角度
溶解性有机物
印染废水
活性污泥
生物强化
three-dimensional electrode
folding angles
dissolved organic matter
dyeing wastewater
activated sludge process
enhanced biological treatment
