Evaluating sulfuric acid reduction,substitution, and recovery to improve environmental performance and biogas productivity in rubber latex industry |
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| Institution: | 1. Energy Technology Research Center, Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai Campus, Hat Yai, Songkhla 90110, Thailand;2. Faculty of Environmental Management, Prince of Songkla University, Hat Yai Campus, Hat Yai, Songkhla 90110, Thailand;3. National Metal and Materials Technology Center, 114 Paholyothin Rd., Klong 1, Klong Luang, Pathumthani 12120, Thailand;1. Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani Campus, 84000, Thailand;2. Faculty of Engineering and Computer Science, Hochschule Osnabrück, University of Applied Sciences, Osnabrück, Germany;1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China;2. College of Petroleum and Chemical Engineering, Qinzhou University, Qinzhou, 535011, China;1. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Science, Post Office Box 2871, Beijing, 100085, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovory Engineering, Beijing University of Technology, Beijing, 100124, China;4. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi, 980-8579, Japan |
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| Abstract: | Sulfuric acid is heavily used in concentrated rubber latex factories to coagulate rubber particles in skim latex. The resulting sulfate-rich wastewater creates the onset of toxic H2S gas production in the wastewater holding ponds, causing severe corrosion to materials and community disturbance when dispersed to ambient air. This work identified and evaluated measures to reduce H2S production by minimizing sulfate concentration in the wastewater. Sulfuric acid use could be cut down by pre-removal of ammonia in the skim latex as well as a stricter manipulation of acid dosing. In search of a more benign chemical, a heat sensitive polymer was identified and tested as sulfuric acid substitute. The use of hydroxypropyl methylcellulose polymer (HPMC) changed wastewater characteristics and was found to increase biogas production approximately by 2.4 times in batch assay at the initial pH 7.0 and methane yield by 2.7 times in continuous digester operation at HRT 7 days. Finally, a resource recovery option was evaluated. The remaining H2S in the produced biogas was oxidized in the biotrickling filter to sulfuric acid that has a potential to partially supplement the fresh acid. This work demonstrated an integrated approach in waste management to improve environmental performance, safety and energy recovery in the concentrated latex industry. |
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| Keywords: | Polymer Sulfuric acid Biogas Rubber latex Biotrickling filter |
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