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| Characteristics of dissolved organic matters in the treatment of the dewatering liquor of anaerobic digestion pretreated by thermal hydrolysis |
| YUE Wen-hui1,2,3, LIU Ji-bao1,2, GUO Jian-ning4, WEI Yuan-song1,2,3, SUI Qian-wen1,2 |
1. State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
2. Department of Water Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China;
4. Shenzhen Institute of Information Technology, Shenzhen 518172, China |
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Abstract An on-site investigation was conducted to characterize dissolved organic matter (DOM) in the anaerobic digestion (AD) filtrate that was generated from a typical sludge thermal hydrolysis process (THP). The results show that the concentrations of ammonia nitrogen and COD in the filtrate were as high as 2034 (±465) and 4128 (±276) mg/L, respectively, and the DOM concentration in the filtrate was mainly macromolecular refractory organic matter, and DOM > 1000Da accounted for 80.6%. The existing "biological pretreatment + two-stage AO-MBR" filtrate treatment process could generally achieve a high-efficiency denitrification (TN removal rate of 94.9% and partial COD removal of 69.9%). Nitrogen removal relied mainly on biological pretreatment units (removal by 79.9%), while DOM removal on membrane filtration of the MBR process (removal by 184.7%). The membrane filtration intercepted DOM was in the order of high molecular polymer > humic acid substances > low molecular organic acids and neutral substances. The effluent DOM was mainly composed of humic acid and fulvic acid substances with a high degree of humification. Existing water washing, acid- and alkali washing had certain cleaning effects on organic pollution of membranes, but the types of DOM in the cleaning solution were significantly different.
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Received: 19 May 2023
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