Optimal dimethyl sulfoxide biodegradation using activated sludge from a chemical plant |
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| Institution: | 1. Department of Civil Engineering, Chung Hua University, No. 707, Sec. 2, Wufu Road, Hsinchu 300, Taiwan, ROC;2. Department of Bioindustry Technology, Da-Yeh University, No. 112, Shan-Jiau Road, Datusen, Changhua 515, Taiwan, ROC;3. Energy & Environment Laboratories, Industrial Technology Research Institute, Bldg. 64, 195, Sec. 4, Chung Hsing Road, Chutung, Hsinchu 310, Taiwan, ROC;1. College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China;2. Beijing Key Laboratory for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control and Eco-remediation, Beijing Forestry University, Beijing, 100083, China;3. Department of Physical and Biological Sciences, Western New England University, 1215 Wilbraham Rd, Springfield, MA 01119, United States;1. Ecole Nationale Supérieure de Chimie de Rennes, Université de Rennes 1, CNRS, UMR 6226, Avenue du général Leclerc, CS 50837, 35708 Rennes Cedex 7, France;2. Université européenne de Bretagne, 5 Boulevard Laënnec, 35000 Rennes, France;3. Akiolis Group, 72 Avenue Olivier Messiaen, 72000 Le Mans, France;4. Laboratoire d’Ingénierie des Matériaux de Bretagne, EA 4250, Université de Bretagne Sud, Allée des Pommiers, 56300 Pontivy, France;5. Atemax France, Route d’Alençon, 61400 Saint-Langis-lès-Mortagne, France;1. Program in Biotechnology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand;2. PTT Research & Technology Institute, Ayutthaya, Thailand;3. UNESCO-IHE Institute for Water Education, P.O. Box 3015, 2601 DA Delft, The Netherlands;4. Biofuels by Biocatalysts Research Unit, Faculty of Science, Chulalongkorn University, Bangkok, Thailand;5. Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, Thailand;6. Aquatic Resources Research Institute, Chulalongkorn University, Bangkok, Thailand;1. State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China;2. Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor 48104, MI, USA;3. Shanghai Municicpal Engineering Design Institute (Group) CO., LTD., Shanghai 200092, PR China |
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| Abstract: | Inappropriate biological treatment of dimethyl sulfoxide (DMSO) used by opto-electronics and semi-conductor industries would result in production of malodorous compounds, e.g. dimethyl sulfide, methane-thiol and hydrogen sulfide. The best sludge for DMSO biodegradation was obtained from the activated sludge of a chemical company that used to provide DMSO for the above industries. Under the optimal conditions of pH 7.0–8.5 and 30 °C, the highest removal efficiency in treatment of 500 mg l?1 of DMSO occurred at the rate of 0.078 g DMSO per gram suspended solids per day corresponding to 37 h for complete DMSO biodegradation in a shake-flask culture. However, the time needed for DMSO biodegradation could be reduced to 16 h at the rate of 0.153 g DMSO per gram suspended solids per day if a repeated-batch mode was adopted, indicating that an acclimation period is required by the DMSO degraders. The reaction time could further be shortened to less than 10 h with 95% removal of the 750 mg l?1 DMSO at the maximum rate of 0.909 g DMSO per gram suspended solids per day using an oxygen-enriched air-lift bioreactor. No malodorous compounds, such as dimethyl sulfide, were produced revealing that the biodegradation pathway is oxidative and can solve the odor problems common in the biological wastewater treatment plant of the abovementioned industries. |
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