| Title: | Inhibition and removal of trichloroacetaldehyde by biological acidification with glucose co-metabolism |
| Author(s): | Tian X; Song Y; Xi H; Shen Z; Zhou Y; Wang K; |
| Address: | "School of Environment, Tsinghua University, Beijing, 100084, PR China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, PR China; Research Center of Environmental Pollution Control Engineering Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, PR China; Research Center of Environmental Pollution Control Engineering Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, PR China; Research Center of Environmental Pollution Control Engineering Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China. Electronic address: shenzq@craes.org.cn. School of Environment, Tsinghua University, Beijing, 100084, PR China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, PR China; Research Center of Environmental Pollution Control Engineering Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China. Electronic address: zhouyuexi@263.ne. School of Environment, Tsinghua University, Beijing, 100084, PR China. Electronic address: wkj@mail.tsinghua.edu.cn" |
| DOI: | 10.1016/j.jhazmat.2019.121796 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "Biological acidification plays a crucial role in biological removal of organic compounds during petrochemical wastewater treatment. Trichloroacetaldehyde is a typical organic pollutant in petrochemical wastewater, however, no studies have been conducted on its effect on biological acidification. In this study, batch bioassays of volatile fatty acids were conducted to explore the inhibitory effect of trichloroacetaldehyde on biological acidification, the variations of key enzymes and extracellular polymeric substances under trichloroacetaldehyde shock, and the mechanism of trichloroacetaldehyde removal. The results of these bioassays indicated that trichloroacetaldehyde inhibited the acid yield at higher concentrations (EC(50) 112.20 mg/L), and butyric fermentation was predominant. Moreover, the contents of extracellular polymeric substances and several key acidifying enzymes greatly decreased when the trichloroacetaldehyde concentration exceeded 100 mg/L, which was due to the toxicity that trichloroacetaldehyde poses to the microbes involved in biological acidification. The trichloroacetaldehyde mechanism was as follows: first, trichloroacetaldehyde was adsorbed by extracellular polymeric substances and anaerobic granular sludge, and then transformed into trichloroethanol, trichloroethane, dichloroacetaldehyde, and dichloroethanol under the combined action of the aldehyde reductase and reductive dehalogenases secreted from the microbial consortium. The ability of biological acidification to remove trichloroacetaldehyde was limited; therefore, trichloroacetaldehyde should be pretreated before it enters biological treatment systems" |
| Keywords: | "Acids/*chemistry Bioreactors Chloral Hydrate/*analogs & derivatives/isolation & purification Fermentation Gas Chromatography-Mass Spectrometry Glucose/*metabolism Microscopy, Fluorescence Oxidation-Reduction Sewage/chemistry Wastewater/chemistry Acidifyin;" |
| Notes: | "MedlineTian, Xiangmiao Song, Yudong Xi, Hongbo Shen, Zhiqiang Zhou, Yuexi Wang, Kaijun eng Research Support, Non-U.S. Gov't Netherlands 2020/01/07 J Hazard Mater. 2020 Mar 15; 386:121796. doi: 10.1016/j.jhazmat.2019.121796. Epub 2019 Dec 9" |
