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Nutrient removal from biogas slurry and biogas upgrading by microalgae-fungi-bacteria co-cultivation under different carbon nanotubes concentration |
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| Authors: | Liu Jinsong Qin Haiyan Meng Xiangzhou Fan Xingjun Zhu Ningzheng Sun Shiqing Zhao Yongjun Jiang Zhoujia |
| Institution: | 1.College of Advanced Materials Engineering, Jiaxing Nanhu University, Jiaxing, 314001, People’s Republic of China ;2.College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, 314001, People’s Republic of China ;3.The 11th Geological Section of Zhejiang Province, 325006, Wenzhou, People’s Republic of China ;4.College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, People’s Republic of China ;5.Jiaxing-Tongji Environmental Research Institute, 1994 Linggongtang Road, Jiaxing, 314051, Zhejiang Province, People’s Republic of China ;6.College of Resource and Environment, Anhui Science and Technology University, Fengyang, 233100, People’s Republic of China ; |
| Abstract: | In this study, Chlorella vulgaris, Ganoderma lucidum, and endophytic bacteria were co-cultivated with the stimulation of strigolactone analogs GR24 to prepare pellets. During the purification of biogas slurry and biogas, multi-walled carbon nanotubes (MWCNTs) were introduced to enhance the removal efficiencies of nutrients and CO2. The results showed that both GR24 and MWCNTs affected the purification of biogas slurry and biogas. The maximum chemical oxygen demand, total nitrogen, total phosphorus, and CO2 removal efficiencies of the Chlorella vulgaris-Ganoderma lucidum-endophytic bacterial symbionts were 82.57?±?7.96% (P?<?0.05), 82.14?±?7.87% (P?<?0.05), 84.27?±?7.96% (P?<?0.05), and 63.93?±?6.22% (P?<?0.05), respectively, with the induction of 10?9 M GR24 and 1 mg L?1 MWCNTs. Moreover, the growth and photosynthetic performance of the symbionts were consistent with the removal effects. The Chlorella vulgaris-Ganoderma lucidum-endophytic bacterial symbionts obtained high growth rates and enzyme activity with the maximum growth rate of 0.365?±?0.03 d?1, mean daily productivity of 0.182?±?0.016 g L?1 d?1, and carbonic anhydrase activity of 31.07?±?2.75 units, respectively. These results indicated that an appropriate concentration of GR24 and MWCNTs could promote the growth of symbionts, reinforce the purification effects of biogas slurry and biogas, and provide a new idea for the simultaneous purification of wastewater and biogas. |
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