Gao Wei, Yang Xiaofang, Zhu Xinmeng, Zhao Shan, Yu Jianwei, Wang Dongsheng, Yang Min
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.
Sci Total Environ. 2022 Sep 20;840:156722. doi: 10.1016/j.scitotenv.2022.156722. Epub 2022 Jun 15.
Identification of the odor characteristics of wastewater sludge is important in the evaluation of sludge quality and disposal options considering that sludge odor nuisance may cause major environmental issues. In this study, raw sludge and sludge cake were collected from five WWTPs applied advanced anaerobic digestion (AAD) sludge treatment process to clarify the variation of odor characteristics using sensory analysis and instrumental analysis. The electronic nose, gas chromatography-ion mobility spectrometry (GC-IMS) and gas chromatography-triple quadrupole tandem mass spectrometry (GC-MS/MS) were used to profile and identify the chemical composition of key odorants. A total of 20 odorants were identified and quantified, including 6 groups of chemicals, among which volatile sulfur compounds (VSCs), indole, 3-methylindole and geosmin were identified as key odorants. The odor of the dewatered digested sludge was improved by means of changing the odor character from fecal/sulfide to earthy odor due to the reduction in VSCs concentration. The AAD and subsequent dewatering process resulted in effective removal of VSCs, which are important constituents that impact the sludge odor characteristics through synergistic effect on fecal odorants and masking effect on earthy odorants. Moreover, due to the variation of sludge quality after AAD treatment, the emission capacity of indole, 3-methylindole, and other volatiles increased, which could not be neglected for the formation of unique sludge odor.
考虑到污泥气味滋扰可能会引发重大环境问题，识别废水污泥的气味特征对于评估污泥质量和处置方案至关重要。在本研究中，从五个采用先进厌氧消化（AAD）污泥处理工艺的污水处理厂收集了原污泥和污泥饼，以通过感官分析和仪器分析来阐明气味特征的变化。使用电子鼻、气相色谱 - 离子迁移谱（GC - IMS）和气相色谱 - 三重四极杆串联质谱（GC - MS/MS）对关键气味物质的化学成分进行剖析和鉴定。总共鉴定并定量了20种气味物质，包括6类化学物质，其中挥发性硫化合物（VSCs）、吲哚、3 - 甲基吲哚和土臭素被确定为关键气味物质。由于VSCs浓度降低，脱水消化污泥的气味特征从粪便/硫化物味转变为土腥味，从而使气味得到改善。AAD及后续脱水过程有效去除了VSCs，VSCs是通过对粪便气味物质的协同作用和对土腥味物质的掩盖作用来影响污泥气味特征的重要成分。此外，由于AAD处理后污泥质量的变化，吲哚、3 - 甲基吲哚和其他挥发性物质的排放能力增加，这对于独特污泥气味的形成不可忽视。
