title: The Selective Use of Hypochlorite to Prevent Pond Crashes for Algae-Biofuel Production.
abstract: Although algae-biofuels have many advantages including high areal productivity, algae can be preyed upon by amoebas, protozoans, ciliates, and rotifers, particularly in open pond systems. Thus, these higher organisms need to be controlled. In this study, Chlorella kessleri was used as the algal culture and Brachionus calyciflorus as the source of predation. The effect of sodium hypochlorite (bleach) was tested with the goal of totally inhibiting the rotifer while causing minor inhibition to the alga. The 24-hr LC(50) for B. calyciflorus in spring water was 0.198 mg Cl/L while the 24-hr LC(50) for C. kessleri was 0.321 mg Cl/L. However, chlorine dissipates rapidly as the algae serves as reductant. Results showed a chlorine dosage between 0.45 to 0.6 mg Cl/L and a dosing interval of two hours created the necessary chlorine concentrations to inhibit predation while letting the algae grow; thus giving algae farmers a tool to prevent pond crashes.
authors.affiliation: School of Civil and Environmental Engineering, Georgia Institute of Technology, 200 Bobby Dodd Way, Atlanta, GA 30313, USA.
authors.forename: Sichoon
authors.initials: S
authors.lastname: Park
authors.forename: Steven W
authors.initials: SW
authors.lastname: Van Ginkel
authors.forename: Priya
authors.initials: P
authors.lastname: Pradeep
authors.forename: Thomas
authors.initials: T
authors.lastname: Igou
authors.forename: Christine
authors.initials: C
authors.lastname: Yi
authors.forename: Terry
authors.initials: T
authors.lastname: Snell
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Chen
mesh_terms: D000818:Animals; D000871:Anthelmintics / Q000494:pharmacology*; D017756:Aquaculture / Q000379:methods*; D056804:Biofuels / Q000032:analysis*; D002708:Chlorella / Q000187:drug effects* / Q000254:growth & development; D020387:Food Chain; D061005:Ponds; D012403:Rotifera / Q000187:drug effects* / Q000254:growth & development; D012973:Sodium Hypochlorite / Q000494:pharmacology*
chemical_list: D000871:Anthelmintics; D056804:Biofuels; D012973:Sodium Hypochlorite