title: Comparison of denitrification performances using PLA/starch with different mass ratios as carbon source.
abstract: 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 NO(3)(-)-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.
authors: Department of Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 10083, China E-mail: wangqh59@sina.com.
authors: Chuanfu
authors: C
authors: Wu
authors: Department of Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 10083, China E-mail: wangqh59@sina.com.
authors: Danqi
authors: D
authors: Tang
authors: Department of Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 10083, China E-mail: wangqh59@sina.com.
authors: Qunhui
authors: Q
authors: Wang
authors: Department of Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 10083, China E-mail: wangqh59@sina.com.
authors: Juan
authors: J
authors: Wang
authors: College of Energy and Power Engineering, Inner Mongolia University of Technology, 49 Aiminjie, Xincheng District, Hohhot City, Inner Mongolia 010051, China.
authors: Jianguo
authors: J
authors: Liu
authors: Department of Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 10083, China E-mail: wangqh59@sina.com.
authors: Yan
authors: Y
authors: Guo
authors: Graduate School of Agricultural & Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.
authors: Shu
authors: S
authors: Liu
mesh_terms: D018407:Bacterial Physiological Phenomena; D018441:Biofilms; D002244:Carbon / Q000032:analysis; D058440:Denitrification; D060587:Groundwater; D019344:Lactic Acid / Q000378:metabolism*; D008855:Microscopy, Electron, Scanning; D009566:Nitrates / Q000378:metabolism*; D011091:Polyesters; D011108:Polymers / Q000378:metabolism*; D013213:Starch / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D009566:Nitrates; D011091:Polyesters; D011108:Polymers; D014874:Water Pollutants, Chemical; D019344:Lactic Acid; C033616:poly(lactide); D002244:Carbon; D013213:Starch