改性稻壳生物炭对水中反硝化过程和N<sub>2</sub>O排放的影响

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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.

Key words： modified rice husk-derived biochar nitrate denitrification N₂O emission

Received: 30 October 2022

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	Articles by authors
	WANG Chao-xu
	LIU Yong-chao
	CHANG Zhi-lin
	CHEN Qi-bin
	WANG Yong
	LI Zuo-chen
	YAN Ming
	WEI Yang

Cite this article:

WANG Chao-xu,LIU Yong-chao,CHANG Zhi-lin等. Effects of modified rice husk-derived biochar on denitrification and N₂O emission from water[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2908-2916.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/2908

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