Enhancement of biochemical methane potential from excess sludge with low organic content by mild thermal pretreatment |
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| Institution: | 1. State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, China;2. School of Civil Engineering, Tongji University, Shanghai, China;3. Research and Service Center for Environmental Protection Industry in Yancheng, Jiangsu Province, China;1. Dept. of Physics, Chemistry and Biology, Linköping University, SE-581 83, Linköping, Sweden;2. Kemira Oyj, P.O. Box 44, FI-02271, Espoo, Finland;3. Tekniska Verken i Linköping AB, P.O. Box 1500, SE-582 78, Linköping, Sweden;4. InZymes Biotech AB, Gjuterigatan 1B, SE-582 73, Linköping, Sweden;1. School of Environmental Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, South Korea;2. Department of Chemical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, South Korea;3. Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, South Korea;1. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410004, China;2. South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou, 510655, China;3. The Technology Review Center of Shenzhen Habition and Environment, Shenzhen, 518033, China;4. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;1. Department of Water and Environmental Science and Technologies, University of Cantabria, Avda. Los Castros, s/n, 39005 Santander, Spain;2. Department of Chemical and Process Engineering Resources, University of Cantabria, Avda. Los Castros, s/n, 39005 Santander, Spain;1. Center of Wastewater Resource Recovery, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China;2. State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China |
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| Abstract: | Excess sludge with low organic content always led to the failure of anaerobic digestion for methane production. Recently, the mild thermal pretreatment, which is usually operated at temperatures below 120 °C, has drawn much attention due to less energy consumption and no chemical addition. In this study the effect of mild thermal pretreatment (50–120 °C) on the solubilization and methane potential of excess sludge with a low concentration of organic matters was investigated. Experimental results showed that the concentration of soluble organic matters increased gradually with temperature during the mild thermal pretreatment of excess sludge. Biochemical methane potential experiments demonstrated that the potential of methane production from excess sludge was greatly enhanced by mild thermal pretreatment, and under the conditions of pretreatment temperature 100 °C and digestion time 20 d the methane yield was as high as 142.6 ± 2.5 mL/g of volatile solids. Mechanism investigation on the enhancement of methane production from excess sludge exhibited that the consumptions of sludge protein and carbohydrate, the adenosine 5′-triphosphate content of anaerobic microorganisms, the activities of key enzymes related to anaerobic digestion, and the amount of methanogens were all improved by mild thermal pretreatment, in correspondence with the production of methane. |
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