| Title: | Effect of low-temperature thermal drying on malodorous volatile organic compounds (MVOCs) emission of wastewater sludge: The relationship with microbial communities |
| Author(s): | Zhu X; Yang X; Gao W; Jiao R; Zhao S; Yu J; Wang D; |
| Address: | "State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Yangtze River Delta Research Center for Eco-Environmental Sciences, Yiwu, 322000, China. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Yangtze River Delta Research Center for Eco-Environmental Sciences, Yiwu, 322000, China. Electronic address: xfyang@rcees.ac.cn. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Yangtze River Delta Research Center for Eco-Environmental Sciences, Yiwu, 322000, China. Research and Development Center, Beijing Drainage Group Co., Ltd, Beijing, 100124, China. Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China. Yangtze River Delta Research Center for Eco-Environmental Sciences, Yiwu, 322000, China; Department of Environment Engineering, Zhejiang University, Hangzhou, 310058, China" |
| DOI: | 10.1016/j.envpol.2022.119423 |
| ISSN/ISBN: | 1873-6424 (Electronic) 0269-7491 (Linking) |
| Abstract: | "Sludge treatment processes are the main source of nuisance odors in wastewater treatment plants. Apart from well-known odorants such as NH(3) and H(2)S, malodorous volatile organic compounds (MVOCs) contribute largely to nuisance odors but are less concerned. In this work, the emission of MVOCs from wastewater sludges at different processing stages was measured, and the effects of dewatering and low-temperature thermal drying on the generation of sludge odor were investigated. The MVOCs were analyzed by olfactory measurements, headspace gas chromatography-coupled ion mobility spectrometry (HS-GC-IMS), and headspace solid-phase microextraction gas chromatography-mass spectrometry (HS-SPME-GC-MS). Low-temperature thermal drying treatment changed the odor categories and increased the odor intensity (OI) from moderate level (8-9) for raw sludges to strong (>10) for dried sludge. The odor emission capacity of MVOCs, namely the concentration of MVOCs, increased for dried sludge. The major odorants of sludge after different processes included 2-MIB, geosmin, dimethyl disulfide (DMDS), dimethyl trisulfide (DMTS), hexanal, and decanal according to their odor activity values (OAVs). The bacterial community structures showed a correlation with the key MVOC odorants. Specifically, there was a significant positive correlation between the concentration of key odorants and the relative abundance of the phyla of Actinobacteria and Chloroflexi. Thus, low-temperature thermal drying had a significant effect on odor formation by acting on the microbial community of sludge" |
| Keywords: | Gas Chromatography-Mass Spectrometry/methods *Microbiota Odorants/analysis Sewage Solid Phase Microextraction/methods Temperature *Volatile Organic Compounds/analysis Wastewater/analysis Hs-gc-ims Hs-spme-gc-ms Microbial community Odor Sludge treatment; |
| Notes: | "MedlineZhu, Xinmeng Yang, Xiaofang Gao, Wei Jiao, Ruyuan Zhao, Shan Yu, Jianwei Wang, Dongsheng eng England 2022/05/11 Environ Pollut. 2022 Aug 1; 306:119423. doi: 10.1016/j.envpol.2022.119423. Epub 2022 May 7" |
