DONG Dong,ZHAO Shan,GUO Xue-bin,et al.Distribution Characteristics of Odorants in Typical Sludge Advanced Anaerobic Digestion Process[J].China Water & Wastewater,2021,37(21 21):7-12.
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Distribution Characteristics of Odorants in Typical Sludge Advanced Anaerobic Digestion Process

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 21 21 Page: 7-12 Column: Date of publication: 2021-11-01
Author(s):
DONG Dong1; ZHAO Shan2; 3; 4; GUO Xue-bin2; 3; 4; XI Jin-ying1
(1. School of Environment, Tsinghua University, Beijing 100084, China; 2. Technology Research and Development Center, Beijing Drainage Group Co. Ltd., Beijing 100124, China; 3. Beijing Drainage Technology Co. Ltd., Beijing 100124, China; 4. Beijing Sewage Resource Engineering Technology Research Center, Beijing 100124, China)
Keywords:
municipal sludge; odorant; anaerobic digestion; thermal hydrolysis
Abstract:
Sludge samples were collected from each unit of a municipal sludge advanced anaerobic digestion treatment project (sludge thickening, centrifugal dewatering, thermal hydrolysis, anaerobic digestion and plate-frame pressure filtration dewatering) in Beijing, and the components and concentration of the odorants volatilized from the sludge were detected by static headspace method. The typical odorants emitted by the sludge in the treatment process included hydrogen sulfide (H2S), methyl mercaptan (CH3SH), ammonia (NH3), dimethyl sulfide (CH3SCH3), toluene, ethylbenzene, D-limonene, etc. The raw sludge, the sludge after thermal hydrolysis and the sludge after anaerobic digestion emitted higher concentration of odorants. The main odorous pollutants of the raw sludge were H2S ［(94.8±43.0) mg/m3］ and volatile organic compounds (VOCs) ［(281.1±118.2) mg/m3］, those of the thermal hydrolysis sludge were CH3SH ［(39.8±24.7) mg/m3］ and CH3SCH3 ［(10.8±2.7) mg/m3］, and those of the anaerobic digested sludge were VOCs ［(336.8±160.9) mg/m3］ and NH3 ［(47.7±21.9) mg/m3］. After dewatering (pre-dewatering and plate-frame pressure filtration dewatering), the volatile concentrations of H2S, VOCs and NH3 in the sludge decreased significantly by 92%, 66% and 96%, respectively. Therefore, it was necessary to pay more attention to the odor prevention and control during the dewatering of sludge. The thermal hydrolysis process significantly increased the volatilization of H2S and CH3SH in the sludge, and the volatilization of the malodorous VOCs from the sludge after thermal hydrolysis was significantly different from other sludge samples. The anaerobic digestion increased the volatilization of NH3 and VOCs in the sludge.
Last Update: 2021-11-01