title: Enhancement of cell production in photosynthetic bacteria wastewater treatment by low-strength ultrasound.
abstract: The present study is aimed at enhanced cell production in together with pollution removal in photosynthetic bacteria wastewater treatment through low-strength ultrasound stimulation. The ultrasound strength was 0.3W/cm(2) with 40kHz frequency. Results showed 1-10min sonication significantly improved the cell production. The optimal sonication time was 2min. When the irradiation period was over 10min, a strong mechanical damage occurred. These phenomena could be explained by the changes of PSB dehydrogenase activity. Sonication stimulated the initial dehydrogenase activity; moderate sonication increased the cell activity while too-long sonication led to quick enzyme activity decrease. The optimal sonication strategy was 1min at the 0th hour and 1min at the 27th hour. The corresponding cell production and cell yield increased by 110% and 93% respectively, and the COD removal reached 98%. The cost of low-strength ultrasound was only 1% of the incremental sales value of cells.
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: zgm5000@126.com.
authors.forename: Guangming
authors.initials: G
authors.lastname: Zhang
mesh_terms: D057919:Biological Oxygen Demand Analysis; D049109:Cell Proliferation / Q000528:radiation effects*; D010088:Oxidoreductases / Q000528:radiation effects; D012241:Rhodopseudomonas / Q000528:radiation effects*; D013010:Sonication; D013016:Sound; D018508:Water Purification
chemical_list: D010088:Oxidoreductases
keywords: Cell accumulation; Dehydrogenase activity; Photosynthetic bacteria; Sonication