Influence of Biochar Addition on Nitrogen Transformation during Copyrolysis of Algae and Lignocellulosic Biomass

Environmental Science & Technology
Wei ChenHanping Chen

Abstract

Algae are extremely promising sustainable feedstock for fuels and chemicals, while they contain high nitrogen content, which may cause some serious nitrogen emission during algae pyrolysis utilization. In this study, we proposed a feasible method to control the nitrogen emission during algae pyrolysis by introducing lignocellulosic biomass and biochar addition. Nitrogen transformation mechanism was investigated through quantitative analysis of N-species in the pyrolysis products. Results showed that copyrolysis of algae and lignocellulosic biomass greatly increased nitrogen in solid char with large amount of NH3 and HCN releasing (∼20 wt %), while nitrogen in bio-oil decreased largely. With biochar addition, NH3, HCN, and N-containing intermediates (amines/amides and nitriles) reacted with higher active O-species (O-C═O, -OH, and -COOH) in biochar addition, and formed large amounts of amine/amide-N, pyridinic-N, pyrrolic-N, and quaternary-N on the surface of biochar addition, which led to most nitrogen being enriched in char product and biochar addition (over 75 wt %) at the expense of amines/amides, nitriles, and N-containing gas (only 3 wt % NH3 and HCN emission; decrease of 85%). These results demonstrated that biochar addit...Continue Reading

References

Sep 8, 2007·Environmental Science & Technology·Lachlan J MckenzieChun-Zhu Li
Mar 24, 2012·Environmental Science & Technology·Qiangqiang Ren, Changsui Zhao
Mar 13, 2013·Environmental Science & Technology·Yu TianTao Tan
Jul 16, 2013·Environmental Science & Technology·Qiangqiang Ren, Changsui Zhao
Aug 21, 2014·Environmental Science & Technology·Ke TianHan-Qing Yu
Mar 25, 2017·Chemical Reviews·Wu-Jun LiuHan-Qing Yu
May 11, 2017·Environmental Science & Technology·Wei ChenHanping Chen
Oct 20, 2017·Bioresource Technology·Wei ChenHanping Chen

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Citations

Jul 17, 2020·Bioresource Technology·Lijian LengHuajun Huang
Oct 6, 2021·Environmental Science. Processes & Impacts·Jiawei ZhangYanhua Xie

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