解析超声-臭氧联合预处理污水污泥中的协同效应。
Interpreting the synergistic effect in combined ultrasonication-ozonation sewage sludge pre-treatment.
机构信息
Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore.
出版信息
Chemosphere. 2015 Dec;140:63-71. doi: 10.1016/j.chemosphere.2014.09.007. Epub 2014 Oct 1.
The sequential combination of ultrasonication and ozonation as sewage sludge treatment prior to anaerobic digestion was investigated. Synergistic volatile suspended solids (VSS) solubilization was observed when low energy ultrasonication (⩽12kJg(-1) TS) was followed by ozonation. 0.048gO3g(-1) TS ozonation induced the maximum VSS solubilization of 41.3% when the sludge was pre-ultrasonicated at 9kJg(-1) TS; while, the same ozone dosage applied without prior ultrasonication only induced 21.1% VSS solubilization. High molecular weight (MW) components (MW>500kDa) were found to be the main solubilization products when sludge was only ozonated. However, solubilization products by ozone were mainly in the form of low MW components (MW<27kDa) when sludge was pre-ultrasonicated. The high MW products generated by ultrasound were effectively degraded in the subsequent ozonation. Anaerobic biodegradability increased by 34.7% when ultrasonication (9kJg(-1) TS) and ozonation (0.036gO3g(-1) TS) were combined sequentially. The maximum methane production rate increased from 3.53 to 4.32, 4.21 and 4.54mL CH4d(-1) after ultrasonication, ozonation and ultrasonication-ozonation pre-treatments, respectively.
超声和臭氧顺序组合作为厌氧消化前的污水污泥处理进行了研究。当低能量超声（≤12kJg（-1）TS）后接着臭氧氧化时，观察到挥发性悬浮固体（VSS）的协同溶解。当污泥在 9kJg（-1）TS 下预先超声处理时，0.048gO3g（-1）TS 的臭氧氧化诱导最大 VSS 溶解率为 41.3％; 而相同的臭氧剂量没有预先超声处理仅诱导 21.1％VSS 溶解。当仅臭氧氧化时，发现高分子量（MW）组分（MW>500kDa）是主要的溶解产物。然而，当污泥仅超声处理时，臭氧的溶解产物主要是低 MW 组分（MW<27kDa）。在随后的臭氧氧化中，超声产生的高 MW 产物被有效降解。当超声（9kJg（-1）TS）和臭氧（0.036gO3g（-1）TS）顺序组合时，厌氧生物降解性增加了 34.7％。最大甲烷产率分别从 3.53 增加到 4.32、4.21 和 4.54mL CH4d（-1），分别进行超声、臭氧氧化和超声-臭氧预处理。
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