title: Preparation and application of a novel bioflocculant by two strains of Rhizopus sp. using potato starch wastewater as nutrilite.
abstract: A complex bioflocculant MBF917 was prepared by Rhizopus sp. M9 and M17 using potato starch wastewater (PSW) as nutrilite, and its flocculation characteristics of treating PSW were studied. Culture conditions of the two strains were optimized, and flocculating conditions of the bioflocculant for treating PSW were also investigated. The optimal and economical culture conditions were determined as COD of about 1600 mg/L, 0.3 g/L urea and 0.04 g/L potassium dihydrogen phosphate, with no need of adding carbon sources or adjusting pH. When the bioflocculant was used to flocculate PSW, the optimal dosage was 0.1 mL/L with addition of 5 mL/L 10% CaCl2 as coagulant aid, and there was no need to adjust pH. After flocculation, COD and turbidity removal rates of the PSW could reach 54.09% and 92.11%, respectively, and 1.1g/L proteic substance was recycled from the PSW as a byproduct that could be used for animal feed.
authors.affiliation: State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, PR China; Sichuan Environmental Protection Key Laboratory of Groundwater Antipollution and Resource Security, Chengdu 610059, PR China. Electronic address: pushengyan@gmail.com.
authors.forename: Sheng-yan
authors.initials: SY
authors.lastname: Pu
authors.affiliation: State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, PR China; College of Earth and Environmental Science, Lanzhou University, Lanzhou 730000, PR China. Electronic address: qinll12@lzu.edu.cn.
authors.forename: Lan-lan
authors.initials: LL
authors.lastname: Qin
authors.affiliation: College of Earth and Environmental Science, Lanzhou University, Lanzhou 730000, PR China.
authors.forename: Jun-ping
authors.initials: JP
authors.lastname: Che
authors.affiliation: College of Earth and Environmental Science, Lanzhou University, Lanzhou 730000, PR China.
authors.forename: Bao-rong
authors.initials: BR
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, PR China; Sichuan Environmental Protection Key Laboratory of Groundwater Antipollution and Resource Security, Chengdu 610059, PR China. Electronic address: xm@cdut.edu.cn.
authors.forename: Mo
authors.initials: M
authors.lastname: Xu
mesh_terms: D001673:Biodegradation, Environmental; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D012233:Rhizopus / Q000254:growth & development / Q000502:physiology*; D011198:Solanum tuberosum / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D062065:Wastewater / Q000382:microbiology*; D018508:Water Purification / Q000379:methods*; D060753:Water Quality
chemical_list: D013213:Starch; D062065:Wastewater
keywords: Cheap cultivation; Complex bioflocculant; Flocculation efficiency; Flocculation treatment; Potato starch wastewater