title: Biomass and pigments production in photosynthetic bacteria wastewater treatment: effects of light sources.
abstract: This study is aimed at enhancing biomass and pigments production together with pollution removal in photosynthetic bacteria (PSB) wastewater treatment via different light sources. Red, yellow, blue, white LED and incandescent lamp were used. Results showed different light sources had great effects on the PSB. PSB had the highest biomass production, COD removal and biomass yield with red LED. The corresponding biomass, COD removal and biomass yield reached 2580 mg/L, 88.6% and 0.49 mg-biomass/mg-COD-removal, respectively. The hydraulic retention time of wastewater treatment could be shortened to 72 h with red LED. Mechanism analysis showed higher ATP was produced with red LED than others. Light sources could significantly affect the pigments production. The pigments productions were greatly higher with LED than incandescent lamp. Yellow LED had the highest pigments production while red LED produced the highest carotenoid/bacteriochlorophyll ratio. Considering both efficiency and energy cost, red LED was the optimal light source.
authors.affiliation: School of Environment & Natural Resource, Renmin University of China, 59 Zhongguancun Street, Beijing 100872, China. Electronic address: zqq2012@126.com.
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China. Electronic address: panyue_zhang@bjfu.edu.cn.
authors.forename: Panyue
authors.initials: P
authors.lastname: Zhang
authors.affiliation: School of Environment & Natural Resource, Renmin University of China, 59 Zhongguancun Street, Beijing 100872, China. Electronic address: zgm@ruc.edu.cn.
authors.forename: Guangming
authors.initials: G
authors.lastname: Zhang
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D001429:Bacteriochlorophylls / Q000096:biosynthesis*; D001673:Biodegradation, Environmental / Q000528:radiation effects; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D002338:Carotenoids / Q000096:biosynthesis*; D008027:Light; D010788:Photosynthesis / Q000528:radiation effects*; D012241:Rhodopseudomonas / Q000378:metabolism* / Q000528:radiation effects; D062065:Wastewater / Q000382:microbiology*; D018508:Water Purification / Q000379:methods*
chemical_list: D000255:Adenosine Triphosphate; D001429:Bacteriochlorophylls; D002338:Carotenoids; D062065:Wastewater
keywords: LED; Light source; Photosynthetic bacteria; Photosynthetic pigments; Yield