Effect of Biochar Structure on Adsorption Characteristics of Ammonia Nitrogen

被引：7

作者：

Chen M. ^{[1
,2
]}

Wang F. ^{[1
,2
]}

Zhang D.-L. ^{[1
,2
]}

Yi W.-M. ^{[1
,2
]}

机构：

[1] School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo

[2] Shandong Research Center of Engineering and Technology for Clean Energy, Zibo

来源：

Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 12期

关键词：

Adsorption; Adsorption kinetics; Ammonia nitrogen; Biochar; Isothermal adsorption;

D O I：

10.13227/j.hjkx.201905161

中图分类号：

学科分类号：

摘要：

Ammonia inhibition is a common phenomenon in biogas engineering which is rich in organic nitrogen substrate. Ammonia nitrogen in anaerobic digestate slurry can be fixed by biochar adsorption. Biochar is prepared from corn stalks and rice husks as raw materials at different temperatures (350℃, 450℃, and 550℃). The purpose is to explore the correlation between the physical and chemical structure of biochar and the adsorption characteristics of ammonia nitrogen. The structure and physicochemical properties of biochar were analyzed by elemental analysis, FTIR, BET, etc., and batch adsorption experiments were conducted to investigate the effect of biochar with different physicochemical properties on adsorption characteristics of ammonia nitrogen. The results indicated that the carbon and ash content in biochar increases with an increase in pyrolysis temperature; the NH4+-N adsorption of the corn stalk biochar prepared at 450℃ (CS450) and the rice husk biochar prepared at 550℃ (RH550) follows the quasi-secondary-and quasi-first-order kinetic models. The Freundlich adsorption model can better describe the isothermal adsorption process of ammonia nitrogen in CS450 and RH550 biochar. The adsorption capacity of corn straw carbon correlated strongly with its surface functional groups. The most significant correlation with the adsorption capacity of rice husk carbon is the specific surface area of biochar, followed by surface functional groups, and finally ash content. Among them, RH550 had the best adsorption performance, and the maximum adsorption capacity was 12.16 mg•g-1. © 2019, Science Press. All right reserved.

引用

页码：5421 / 5429

页数：8

共 41 条

[31]

Novak J M, Lima I, Xing B S, Et al., Characterization of designer biochar produced at different temperatures and their effects on a loamy sand, Annals of Environmental Science, 3, pp. 195-206, (2009)

[32]

Wu W X, Yang M, Feng Q B, Et al., Chemical characterization of rice straw-derived biochar for soil amendment, Biomass and Bioenergy, 47, pp. 268-276, (2012)

[33]

Lin J Y, Zhang Y, Liu Y, Et al., Structure and properties of biochar under different materials and carbonization temperatures, Chinese Journal of Environmental Engineering, 10, 6, pp. 3200-3206, (2016)

[34]

Wang X F, Zheng L A, Liu M, Et al., Adsorption characters of Cu2+ and NH4+-N in wastewater by modified corncob biochar, Industrial Water Treatment, 37, 1, pp. 37-41, (2017)

[35]

Zhang D L, Wang F, Yi W M, Et al., Comparison study on pyrolysis characteristics and kinetics of corn stover and its digestate by TG-FTIR, BioResources, 12, 4, pp. 8240-8254, (2017)

[36]

Sun T, Zhu X P, Li D P, Et al., Comparison of biochars characteristics from different raw materials, Journal of Agricultural Resources and Environment, 34, 6, pp. 543-549, (2017)

[37]

Kizito S, Wu S B, Kipkemoi Kirui W, Et al., Evaluation of slow pyrolyzed wood and rice husks biochar for adsorption of ammonium nitrogen from piggery manure anaerobic digestate slurry, Science of the Total Environment, 505, pp. 102-112, (2015)

[38]

[39]

Lee W, Yoon S, Choe J K, Et al., Anionic surfactant modification of activated carbon for enhancing adsorption of ammonium ion from aqueous solution, Science of the Total Environment, 639, pp. 1432-1439, (2018)

[40]

Jang Y H, Li A Y, Yan F, Et al., Research on adsorption properties of Mg-loaded banana stalk biochar on nitrogen and phosphorus, Journal of Agricultural Resources and Environment, 35, 6, pp. 559-567, (2018)

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