Effects of dissolved oxygen on key enzyme activities during photosynthetic bacteria wastewater treatment |
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| Institution: | 1. School of Environment and Natural Resource, Renmin University of China, 59 Zhongguanchun Street, Beijing 100872, China;2. School of Environmental Science & Engineering, Beijing Forestry University, 35 Qinghuadong Road, Beijing 100083, China;3. College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China;1. School of Environment and Natural Resource, Renmin University of China, 59 Zhongguanchun Street, Beijing 100872, China;2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;3. Shandong Public Holdings Tongtai Environment Limited, Jining, Shangdong 277200, China |
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| Abstract: | Photosynthetic bacteria (PSB) wastewater treatment is a novel method that can simultaneously achieve wastewater purification and recourse recovery. Oxygen conditions can significantly influence PSB metabolism and wastewater treatment; however, the roles of key enzymes in this process have been unclear. This study investigated the effects of different oxygen conditions on respiratory enzymes (hexokinase, HK; phosphofructokinase, PFK; and pyruvate kinase, PK) and the photosynthetic enzyme RuBisCO of PSB. The results showed that HK activity was almost the highest under anaerobic condition; PFK activity was the highest (311 nmol/min∙g) and PK the most quickly reached its peak under aerobic condition; and RuBisCO activity was the highest (107 nmol/min g) under anaerobic condition. The above results illustrated that HK might simultaneously regulate PSB growth and COD degradation, and its main role might be PSB growth regulation. PFK and PK might function in COD degradation while RuBisCO might function in PSB growth. Further, oxygen was beneficial for COD degradation and detrimental for PSB growth. This study provides a theoretical basis for the development of PSB wastewater treatment. |
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| Keywords: | Photosynthetic bacteria Enzyme activity Dissolved oxygen Photophosphorylation Oxidative phosphorylation |
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