期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 285, 期 -, 页码 199-206出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2014.12.005
关键词
Starch; Grafting synthesis; Flocculant; Sludge dewatering
资金
- Special Foundation for Technique Development Research of Institute [2013EG111128]
- Guangzhou Pollution Prevention and Control Technology Project
- Foundation for High-level Talents in Higher Education of Guangdong, China [2014009]
Flocculation is one of the most widely used cost-effective pretreatment method for sludge dewatering, and a novel environmentally friendly and efficient flocculant is highly desired in the sludge dewatering field. In this study, a novel combined silicon-aluminum-ferric-starch was synthesized by grafting silicon, aluminum, and iron onto a starch backbone. The synthesized starch flocculant was characterized using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy, X-ray powder diffraction, and thermogravimetric analysis. The dewatering performance of secondary sludge was evaluated according to the capillary suction time, settling volume percentage, and specific resistance to filtration. The results indicated that the copolymer exhibited: (1) a good dewatering efficiency over a wide pH range of 3.0-11.0, (2) superior sludge dewatering performance compared to those of polyaluminum chloride (PACl), polyacrylamide (PAM), ferric chloride, and (3) a discontinuous surface with many channels or voids that helps to mobilize the impermeable thin layer of secondary sludge during filter pressing. Such a novel copolymer is a promising green flocculant for secondary sludge dewatering applications. (C) 2014 Elsevier B.V. All rights reserved.
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