title: Mg2+ improves biomass production from soybean wastewater using purple non-sulfur bacteria.
abstract: Soybean wastewater was used to generate biomass resource by use of purple non-sulfur bacteria (PNSB). This study investigated the enhancement of PNSB cell accumulation in wastewater by Mg2+ under the light-anaerobic condition. Results showed that with the optimal Mg2+ dosage of 10 mg/L, biomass production was improved by 70% to 3630 mg/L, and biomass yield also was improved by 60%. Chemical Oxygen Demand (COD) removal reached above 86% and hydraulic retention time was shortened from 96 to 72 hr. The mechanism analysis indicated that Mg2+ could promote the content of bacteriochlorophyll in photosynthesis because Mg2+ is the bacteriochlorophyll active center, and thus improved adenosine triphosphate (ATP) production. An increase of ATP production enhanced the conversion of organic matter in wastewater into PNSB cell materials (biomass yield) and COD removal, leading to more biomass production. With 10 mg/L Mg2+, bacteriochlorophyll content and ATP production were improved by 60% and 33% respectively.
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: wupan20071120@163.com.
authors: Pan
authors: P
authors: Wu
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; School of Environment & Resource, Renmin University of China, Beijing 100872, China. Electronic address: zgm@ruc.edu.cn.
authors: Guangming
authors: G
authors: Zhang
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors: Jianzheng
authors: J
authors: Li
mesh_terms: D018533:Biomass; D008274:Magnesium / Q000378:metabolism*; D012242:Rhodobacter sphaeroides / Q000378:metabolism*; D013025:Glycine max / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis*
chemical_list: D008274:Magnesium; D062065:Wastewater
keywords: Biomass resource; Mg(2+); Photosynthesis; Purple non-sulfur bacteria; Soybean wastewater