文献类型：期刊文献

英文题名：Enhancement performance of CO2 on the organic toxicity removal of sludge by Scenedesmus obliquus with proteomics analysis

作者：Hu, Xueyang[1,2];Wei, Xiao[1,2];Yang, Yingying[1,2];Zhang, Xinyu[1,2];Chen, Xiurong[1,2];Tian, Jinyi[1,2];Zhao, Jiamin[1,2];Yu, Xiao[1,2]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China

年份：2022

卷号：61

外文期刊名：JOURNAL OF CO2 UTILIZATION

收录：;EI(收录号：20222112159958);WOS:【SCI-EXPANDED(收录号:WOS:000804470000003)】；

基金：Acknowledgement This research was supported by the National Natural Science Foun-dation of China (No. 51878278) .

语种：英文

外文关键词：Sludge extract; Toxicity removal; Carbon dioxide; Scenedesmus obliquus; Proteomics

摘要：Microalgae have strong adaptability to toxic environments. The accumulation of toxic organic matter and secondary metabolites during the biologically treatment of wastewater can cause sludge toxicity. Scenedesmus obliquus was cultivated in the sludge extract from coal-gasification synthetic wastewater contained 100 mg/L hydroquinone, with 15% CO2, to investigate the removal of sludge toxicity together with CO2 fixation. Results showed that S. obliquus could utilize the organic matter and CO2 in the mixed cultivation mode. On the 30th day, the dry cell weight was 1.46 +/- 0.07 g/L, and chlorophyll-a was 24.76 +/- 0.21 mg/L. S. obliquus reduced the sludge toxicity by heterotrophically utilizing the organic matter of sludge extract. TOC decreased from 393.52 +/- 0.65 mg/L to 113.78 +/- 0.43 mg/L, and organic matter with molecular weights of < 500 Da and 500-5KDa was significantly consumed, reducing the sludge toxicity from 83.46 +/- 0.27% to 29.37 +/- 0.19% in terms of inhibition rate of luminescent bacteria. S. obliquus mainly utilized HCO3- for autotrophic growth and the CO2 removal (%) was up to the maximum 35.08 +/- 0.19% on the 10th day. Proteomics analysis results showed that 15% CO2 improved autotrophic ability of S. obliquus and the activity of the functional protein, thereby improving its antioxidant capacity against toxicity stress. By increasing its protein kinase and ATPase activity, S. obliquus enhanced the oxidative phosphorylation process to heterotrophically utilize organic matter to reduce the sludge toxicity.