A suitable carbon source is significant for biological nitrate removal from groundwater. In this study, slow-release carbon sources containing polylactic acid (PLA) and starch at 8:2, 7:3, 6:4, 5:5, 4:6, and 3:7 ratios were prepared using a blending and fusing technique. The PLA/starch blend was then used as a solid carbon source for biological nitrate removal. The carbon release rate of PLA/starch was found to increase with increased starch content in leaching experiments. PLA/starch at 5:5 mass ratio was found to have the highest denitrification performance and organic carbon consumption efficiency in semi-continuous denitrification experiments, and was also revealed to support complete denitrification at 50 mg-N/L influent nitrate concentration in continuous experiments. The effluent nitrate concentration was <2 mg NO3–-N/L, which met the national standard (GB 14848-93) for groundwater. Scanning electron microscopy results further showed that the surface roughness of PLA/starch increased with prolonged experimental time, which may be conducive to microorganism attachment. Therefore, PLA/starch was a suitable carbon source and biofilm carrier for groundwater remediation.
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February 06 2015
Comparison of denitrification performances using PLA/starch with different mass ratios as carbon source Available to Purchase
Chuanfu Wu;
Chuanfu Wu
1Department of Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 10083, China
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Danqi Tang;
Danqi Tang
1Department of Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 10083, China
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Qunhui Wang;
1Department of Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 10083, China
E-mail: [email protected]
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Juan Wang;
Juan Wang
1Department of Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 10083, China
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Jianguo Liu;
Jianguo Liu
2College of Energy and Power Engineering, Inner Mongolia University of Technology, 49 Aiminjie, Xincheng District, Hohhot City, Inner Mongolia 010051, China
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Yan Guo;
Yan Guo
1Department of Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 10083, China
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Shu Liu
Shu Liu
3Graduate School of Agricultural & Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
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Water Sci Technol (2015) 71 (7): 1019–1025.
Article history
Received:
August 30 2014
Accepted:
January 22 2015
Citation
Chuanfu Wu, Danqi Tang, Qunhui Wang, Juan Wang, Jianguo Liu, Yan Guo, Shu Liu; Comparison of denitrification performances using PLA/starch with different mass ratios as carbon source. Water Sci Technol 1 April 2015; 71 (7): 1019–1025. doi: https://doi.org/10.2166/wst.2015.048
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