title: Biomass production from fermented starch wastewater in photo-bioreactor with internal overflow recirculation.
abstract: A photo-bioreactor with internal overflow recirculation was applied to treat real fermented starch wastewater and convert it to photosynthetic biomass for further utilization. The photo-bioreactor was operated at a hydraulic retention time of 10days by circulating mixed liquor through overflow pipes and penetrating light through infrared transmitting filter. During the operation of 154days, the average BOD and COD removals were 95% and 88%, respectively. Majority of photosynthetic bacteria was found attached on pipes as biofilm contributed to 82% of total biomass production. Photosynthetic biomass yield was 0.51g dried solid/g BOD removed and crude protein content of 0.58g/g dried solid. Rhodopseudomonas palustris was found in the photosynthetic system as the predominant bacterial group by denaturing gradient gel electrophoretic analysis (DGGE) and 16S rDNA sequencing method.
authors.affiliation: (a)Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok 10900, Thailand.
authors.forename: Pradthana
authors.initials: P
authors.lastname: Prachanurak
authors.affiliation: (a)Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok 10900, Thailand. Electronic address: fengccc@ku.ac.th.
authors.forename: Chart
authors.initials: C
authors.lastname: Chiemchaisri
authors.affiliation: (a)Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok 10900, Thailand.
authors.forename: Wilai
authors.initials: W
authors.lastname: Chiemchaisri
authors.affiliation: (b)Environmental Science Center, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Yamamotob
mesh_terms: D001419:Bacteria / Q000235:genetics / Q000254:growth & development; D018441:Biofilms; D018533:Biomass; D058645:Denaturing Gradient Gel Electrophoresis; D005285:Fermentation; D009930:Organic Chemicals / Q000302:isolation & purification; D058433:Photobioreactors / Q000382:microbiology; D010788:Photosynthesis; D016133:Polymerase Chain Reaction; D012212:Rheology; D013213:Starch / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification
chemical_list: D009930:Organic Chemicals; D013213:Starch; D062065:Wastewater
keywords: Fermented starch wastewater; Overflow recirculation; Photo-bioreactor; Purple non-sulfur bacteria; Rhodopseudomonas palustris