Effects of modified rice husk-derived biochar on denitrification and N2O emission from water
WANG Chao-xu1, LIU Yong-chao1, CHANG Zhi-lin1, CHEN Qi-bin1, WANG Yong2, LI Zuo-chen2, YAN Ming2, WEI Yang2
1. College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong 030600, China; 2. Stecol Corporation North International Engineering Co., Ltd., Jinzhong 030600, China
Abstract：The study focused on exploring the effects of H2O2-and NaBH4-modified rice husk-derived biochars (BC-H2O2 and BC-NaBH4) on denitrification and N2O emission and the potential mechanisms. Based on BC-H2O2 and BC-NaBH4 preparation and their physicochemical property and surface oxygen-containing functional group content determination, the pristine rice husk-derived biochar (BC), BC-H2O2, and BC-NaBH4 were added into the incubation system containing the screened anaerobic denitrifier (DB) at the ratio of 1% (w/V), respectively. The microcosm incubation experiment was carried out to explore the removal efficiency of nitrate nitrogen (about 10mg/L) from simulated wastewater by DB. Results showed that H2O2-modification increased the carboxyl content on the surface of biochar, while NaBH4-modification increased the contents of lactone and phenolic hydroxyl on the surface of biochar. In addition, the Fourier transform infrared spectra analysis showed that C=O content of BC-H2O2 was significantly higher than that of BC. The denitrification rate peaks of DB+BC-H2O2 and DB+BC-NaBH4 appeared 12h earlier and their values were 17.50% and 6.32% higher than that of DB+BC, respectively. Compared with DB+BC, the cumulative N2O emission of DB+BC-NaBH4 increased by 10.43%, but the difference was not significant. However, the cumulative N2O emission of DB+BC-H2O2 increased by 165.54% and the N2O/(N2O+N2) ratio increased by 170.00% significantly, while there was no significant difference in the cumulative N2O+N2 emission between DB+BC-H2O2 and DB+BC (P<0.05). The result indicated that BC-H2O2 inhibited N2O reduction to N2 and promoted N2O emission, which might be related to the decrease of pH and carbon bioavailability and the increase of C=O content induced by BC-H2O2 amendment.
王朝旭, 刘勇超, 常智淋, 陈启斌, 王永, 李作臣, 闫铭, 魏阳. 改性稻壳生物炭对水中反硝化过程和N2O排放的影响[J]. 中国环境科学, 2023, 43(6): 2908-2916.
WANG Chao-xu, LIU Yong-chao, CHANG Zhi-lin, CHEN Qi-bin, WANG Yong, LI Zuo-chen, YAN Ming, WEI Yang. Effects of modified rice husk-derived biochar on denitrification and N2O emission from water. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2908-2916.
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