物化吸收混合体系强化小球藻固定CO_(2)研究

CO_(2)Fixation by Chlorella Vulgaris Enhanced Coupled with a Mixed System of Physical and Chemical Absorption

为强化小球藻固定转化CO_(2),本文选择3种化学吸收剂:聚乙二醇(PEG 200)、单乙醇胺(MEA)、碳酸钾(K_(2)CO_(3)),并与纳米纤维膜(NFMs)耦合,考察(PEG/K_(2)CO_(3)、PEG/MEA、MEA/K_(2)CO_(3))化学体系、(NFMs/PEG)物-化吸收混合体系中小球藻的生长与固碳情况。实验结果表明:NFMs/PEG物-化混合吸收体系可提高小球藻对CO_(2)的吸收利用,小球藻最大生物量产率为0.357 g/(L·d),最大CO_(2)固定率达0.612 g/(L·d),CO_(2)利用效率为52.3%;三种化学混合吸收体系中,PEG/K_(2)CO_(3)体系的小球藻生长最好,培养3天的生物量产率最大为0.320 g/(L·d),CO_(2)固定率为0.590 g/(L·d),显著高于PEG/MEA组和MEA/K_(2)CO_(3)组。

In order to enhance the fixation and conversion of CO_(2)by Chlorella vulgaris,three kinds of chemical absorbers:polyethylene glycol(PEG 200),monoethanolamine(MEA),potassium carbonate(K_(2)CO_(3)),were chose and mixed with nanofiber membrane(NFMs)respective-ly.The absorption effects of chemical absorption mixed system(PEG/K_(2)CO_(3),PEG/MEA,MEA/K_(2)CO_(3))and physicochemical absorption mixed sys-tem(NFMs/PEG)on CO_(2)were investigated.The growth and carbon sequestration of Chlorella in different mixed systems were investigated by cou-pling the mixed systems with the carbon sequestration process of microalgae,and the CO_(2)absorption or fixation effects of all the above systems were compared and analyzed.The results showed that the CO_(2)absorption could be improved in NFMs/PEG-chemical absorption system,and the maxi-mum biomass yield of Chlorella was 0.357 g/(L·d).The maximum CO_(2)fixation rate was 0.612 g/(L·d),and the CO_(2)utilization efficiency was 52.3%.Among the three chemical mixed absorption systems,PEG/K_(2)CO_(3)system had the best growth,with the maximum biomass yield of 0.320 g/(L·d)and CO_(2)fixation rate of 0.590 g/(L·d),which was significantly higher than that of PEG/MEA group and MEA/K_(2)CO_(3)group.