Enhanced SMD process in treating organic sulfur compounds and para-ester manufacturing wastewater by micro-electric field-ZVI-UBF
GUO Jin1,, SHUI Yuanmin2, WAN Peipei2, LI Weicheng3, GAO Yingxin3, QI Weikang4,, 1.Huahang Environmental Developed Co. Ltd., Beijing 100071, China 2.Dasmart Environmental Science and Technologies Co. Ltd., Beijing 100089, China 3.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Science, Beijing 100085, China 4.National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
Abstract:Organic sulfur(s) compounds and para-ester manufacturing wastewater was characterized as high COD, rich sulfate and organic S compounds and low C/S ratio. Single anaerobic reactor treating this kind of wastewater can only run at low COD loading rate (OLR), then the micro-electric field - zero-valent-iron (ZVI) joint system was used to treat it based on the enhancing effect of methanogenesis and denitrification from organic S compounds and para-ester manufacturing wastewater. The experimental result indicated that the compound bed could remove 70% of COD, achieve 1.41 L·(L·d)?1 of methane production rate, 87% of denitrification efficiency and 74% para-ester degradation efficiency at COD organic load rating (OLR) up to 6.67 g·(L·d)?1 and influent COD of 20 000 mg·L?1. At COD/$ {\rm{TSO}}_4^{2 - } $ (total sulfate) of 1.57, COD removal efficiency, methane production rate and denitrification efficiency could be stabilized at 60%, 1.18 L·(L·d)?1 and 79%, respectively. At COD/$ {\rm{TSO}}_4^{2 - } $ of 0.88, a moderate inhibition of methanogenesis occurred, while the anaerobic system could recover after seven days when COD/$ {\rm{TSO}}_4^{2 - } $ was set back to 1.57 again, indicating the resilience of the joint system. This study revealed that compared with single UBF treatment, the combination micro-electric field-zero-valent-iron (ZVI) with UBF not only resulted in the significant increase of operated OLR and the ability of simultaneous methanogeneis and denitrification (SMD) of the joint system, but also tolerance to lower C/S ratio. Key words:micro-electric field-zero-valent-iron (ZVI)-UBF/ organic sulfur compound/ para-ester manufacturing wastewater/ COD/$ {\rm{TSO}}_4^{2 - } $ ratio/ simultaneous methanogenesis and denitrification process.
图1对位酯的化学结构式 Figure1.Chemical structure of para-ester
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1.Huahang Environmental Developed Co. Ltd., Beijing 100071, China 2.Dasmart Environmental Science and Technologies Co. Ltd., Beijing 100089, China 3.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Science, Beijing 100085, China 4.National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China Received Date: 2019-10-19 Accepted Date: 2020-02-17 Available Online: 2020-08-12 Keywords:micro-electric field-zero-valent-iron (ZVI)-UBF/ organic sulfur compound/ para-ester manufacturing wastewater/ COD/$ {\rm{TSO}}_4^{2 - } $ ratio/ simultaneous methanogenesis and denitrification process Abstract:Organic sulfur(s) compounds and para-ester manufacturing wastewater was characterized as high COD, rich sulfate and organic S compounds and low C/S ratio. Single anaerobic reactor treating this kind of wastewater can only run at low COD loading rate (OLR), then the micro-electric field - zero-valent-iron (ZVI) joint system was used to treat it based on the enhancing effect of methanogenesis and denitrification from organic S compounds and para-ester manufacturing wastewater. The experimental result indicated that the compound bed could remove 70% of COD, achieve 1.41 L·(L·d)?1 of methane production rate, 87% of denitrification efficiency and 74% para-ester degradation efficiency at COD organic load rating (OLR) up to 6.67 g·(L·d)?1 and influent COD of 20 000 mg·L?1. At COD/$ {\rm{TSO}}_4^{2 - } $ (total sulfate) of 1.57, COD removal efficiency, methane production rate and denitrification efficiency could be stabilized at 60%, 1.18 L·(L·d)?1 and 79%, respectively. At COD/$ {\rm{TSO}}_4^{2 - } $ of 0.88, a moderate inhibition of methanogenesis occurred, while the anaerobic system could recover after seven days when COD/$ {\rm{TSO}}_4^{2 - } $ was set back to 1.57 again, indicating the resilience of the joint system. This study revealed that compared with single UBF treatment, the combination micro-electric field-zero-valent-iron (ZVI) with UBF not only resulted in the significant increase of operated OLR and the ability of simultaneous methanogeneis and denitrification (SMD) of the joint system, but also tolerance to lower C/S ratio.
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