Enhanced CO2 fixation by a non-photosynthetic microbial community under anaerobic conditions: optimization of electron donors.
To enhance the CO(2) fixation efficiency of the non-photosynthetic microbial community (NPMC) isolated from sea water under anaerobic conditions without hydrogen, the concentration of inorganic compounds as electron donors and their ratios were optimized by response surface methodology design (RSMD). The results indicated that the CO(2) fixation efficiency of NPMC using NaNO(2), Na(2)S(2)O(3) and Na(2)S as the electron donors was increased about 90%, 75% and 207%, respectively. Additionally, there were interactions between two electron donors and three electron donors. Central composite RSMD experimentation predicted that the optimal concentration and ratios of these inorganic compounds was 1.04% NaNO(2), 1.07% Na(2)S(2)O(3) and 0.98% Na(2)S. Under these conditions, the fixed CO(2) was 139.89 mg/L, which obviously exceeded the amount prior to optimization, as well as when H(2) was used as an electron donor. The established electron donor system can effectively enhance the CO(2) fixation efficiency of NPMC without hydrogen under anaerobic conditions.
School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, China.
Jia-Jun
JJ
Hu
Lei
L
Wang
Shi-Ping
SP
Zhang
Xiao-Hua
XH
Fu
Yi-Quan
YQ
Le
Hui-Rong
HR
Li
D001421:Bacteria, Anaerobic / Q000378:metabolism*; D002245:Carbon Dioxide / Q000378:metabolism*; D003198:Computer Simulation; D004579:Electron Transport; D007287:Inorganic Chemicals / Q000378:metabolism*; D008954:Models, Biological; D010788:Photosynthesis
D007287:Inorganic Chemicals; D002245:Carbon Dioxide