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DOI: https://doi.org/10.4491/eer.2020.039
A study on novel coupled membrane bioreactor with electro oxidation for biofouling reduction
Kamalakannan Vasanthapalaniappan1, Kavitha Palani1, Shanmuga Sundar Saravanabhavan1, Narendranath Jonna1, Maharaja Pounsamy2, Kannan Natarajan3, Yun Suk Huh4, and Balasubramanian Natesan1
1Department of Chemical Engineering, A.C.Tech campus, Anna University, Chennai 25, India
2CSIR–Central Leather Research Institute, Adyar, Chennai 20, India
3Department of Biotechnology, Manipal Institute of Technology, Manipal, Karnataka-576104, India
4Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 22212, Republic of Korea
Corresponding Author: Balasubramanian Natesan ,Tel: +044 2235 9190/9172, Email: nbsbala@gmail.com
Received: January 24, 2020;  Accepted: September 2, 2020.
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ABSTRACT
The present study focuses on a novel method to integrate the electro-oxidation process with membrane bioreactor to reduce biofouling and increase the biodegradability index. Here, we used electro-oxidation as pretreatment with membrane bioreactor operating at a current density of 1.5 mA/cm2 with hydraulic retention time at six h. The mixed liquor suspended solids concentration was maintained constant at 3,200 mg/L throughout the experiment for 30 days. The results obtained were promising with the percentage removal of COD, TOC, total nitrogen, and chlorides were in the range of 97%, 90%, 94%, and 15%, respectively, which was comparatively higher than the existing membrane bioreactor. The biodegradable index of treated water was higher, reaching a maximum of 0.6, which is remarkably high compared with 0.3 in a membrane bioreactor. The integrated electro-oxidation process was efficient for the complete removal of pollutants from wastewater, which was confirmed using gas chromatography. In addition, the phytotoxicity test showed a significantly higher quality of treated water compared with that of raw tannery effluent. Hence, our proposed integrated electro-oxidation process can be used to decrease biofouling with increased biodegradability index as a replacement for MBR.
Keywords: Biofouling | Biodegradability Index | Electro-Oxidation | Membrane Bioreactor | Mineralization
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