title: Particle size distribution and removal by a chemical-biological flocculation process.
abstract: The particle characterization from the influent and effluent of a chemical-biological flocculation (CBF) process was studied with a laser diffraction device. Water samples from a chemically enhanced primary treatment (CEPT) process and a primary sediment tank process were also analyzed for comparison. The results showed that CBF process was not only effective for both the big size particles and small size particles removal, but also the best particle removal process in the three processes of CBF process, CEPT process, and PST process (primary sediment tanks). The results also indicated that CBF process was superior to CEPT process in the heavy metals removal. The high and non-selective removal for heavy metals might be closely related to its strong ability to eliminate small particles. Samples from different locations in CBF reactors showed that small particles were easier to aggregate into big ones and those disrupted flocs could properly flocculate again along CBF reactor because of the biological flocculation.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse Research, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. zhazhb@163.com
authors.forename: Zhi-Bin
authors.initials: ZB
authors.lastname: Zhang
authors.forename: Jian-Fu
authors.initials: JF
authors.lastname: Zhao
authors.forename: Si-Qing
authors.initials: SQ
authors.lastname: Xia
authors.forename: Chang-Qing
authors.initials: CQ
authors.lastname: Liu
authors.forename: Xing-Sheng
authors.initials: XS
authors.lastname: Kang
mesh_terms: D005427:Flocculation; D019216:Metals, Heavy / Q000032:analysis / Q000737:chemistry; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry; D010316:Particle Size; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry; D000644:Quaternary Ammonium Compounds / Q000032:analysis / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D019216:Metals, Heavy; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen