Preparation of biochar ball with agricultural ditch sediment and rice straw by pyrolysis and adsorption of ammonium

被引：0

作者：

Chen C. ^{[1
]}

Zhou S. ^{[1
]}

Hu B. ^{[2
]}

Xu L. ^{[3
]}

Sheng G. ^{[4
]}

机构：

[1] Department of Architectural Engineering, Yuanpei College, Shaoxing University, Shaoxing

[2] College of Life Science, Shaoxing University, Shaoxing

[3] Shaoxing Enviromental Monitoring Center, Shaoxing

[4] College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing

来源：

Hu, Baowei (huw@usx.edu.cn) | 1600年 / International Research and Training Center on Erosion and Sedimentation and China Water and Power Press卷 / 48期

关键词：

Adsorption; Agricultural ditch sediment; Ammonium; Biochar ball; Rice straw;

D O I：

10.13243/j.cnki.slxb.20160805

中图分类号：

学科分类号：

摘要：

Agricultural ditch sediments were mixed with rice straw according to their ratios of mass, five treatments including no rice straw addition, and mass ratios of agricultural ditch sediment and rice straw were 20:1, 10:1, 20:3, 5:1, then all the samples were made into particle balls, of which the size was 5 mm, finally, they were prepared at 600℃ by anaerobic pyrolysis 4h into biochar balls, and respectively marked as SS-0, SS-50, SS-100, SS-150, SS-200. Elemental analysis, BET-N2 surface area (SA) and porosity analysis, scanning electron microscope, FTIR spectra analysis and Boehm titration were used to characterized their physicochemical properties. Sequencing batch experiments were conducted to investigate ammonium adsorption performance of biochar balls, to build the kinetics models and adsorption isotherm models, and also to research the effects of water temperature on ammonium adsorption. The results revealed that rice straw addition was beneficial to increase the permeability and hydrophilic of biochar balls, and enhanced their mass transfer performance, which were 14%, 52%, 26%, 33% and 38% for SS-0, SS-50, SS-100, SS-150 and SS-200 samples, respectively; while the amounts of acidic functional groups were 2.74, 2.88, 3.71, 3.36 and 3.03 mmol·L-1, respectively. The results for fitting experimental data of adsorption process with kinetics models show that SS-0 biochar ball is more aligned with pseudo-first-order kinetic equation, however, the adsorption of ammonium on SS-50, SS-100, SS-150 and SS-200 biochar balls follows pseudo-second-order kinetic equation well, in addition to the intra-particle diffusion, there are other common controlling ammonium adsorption rates of biochar balls. Moreover, Langmuir equation could accurately describe the adsorption isotherms of ammonium on biochar balls. The indexes of Freundlich isotherms equation are all less than 1, which show that the absorptions are endothermic processes, and high temperature is beneficial to the adsorption of ammonium. © 2017, China Water Power Press. All right reserved.

引用

页码：325 / 333

页数：8

共 11 条

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