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Study on dynamic sorption characteristics of modified biochars for ammonium in biogas slurry

International Journal of Agricultural and Biological Engineering 2020年第1期13卷 234-240页

作者： Jingtao Ding Yujun Shen Yanru Ma Haibo Meng Hongsheng Cheng Xi Zhang Jian Wang Pengyue Zhang Institute of Energy and Environmental Protection Academy of Agricultural Planning&EngineeringMinistry of Agriculture and Rural AffairsBeijing 100125China Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources Ministry of Agriculture and Rural AffairsBeijing 100125China College of Engineering Huazhong Agricultural UniversityWuhan 430070China

The objective of this study was to investigate the relationship between ammonium(NH^(+)_(4)-N)dynamic sorption capacity and physicochemical properties of modified ***,producing from three species of agricultural wastes of cornstalk(A),corncob(B)and sawdust(C)at 550°C,600°C and 650°C,were modified by four methods of NaOH plus microwave(NaM),KOH(K),FeCl 3(Fe)and HNO 3(H).The static and dynamic adsorption experiments were conducted to investigate sorption characteristics of modified biochars on NH^(+)_(4)-N in slurry of piggery manure anaerobic *** modified biochars with better NH^(+)_(4)-N adsorption rates were selected through static kinetics adsorption tests,which showed that chemical reactions might have occurred during the NH^(+)_(4)-N sorption process and the maximum NH^(+)_(4)-N removal rates of B-550-Fe,A-550-NaM,A-550-K and C-600-NaM were 66.64%,57.50%,52.39%and 45.20%,*** dynamic adsorption column experiment was conducted in a three-stage adsorption column packed with the selected three modified ***^(+)_(4)-N dynamic adsorption depended on the slurry inflow flow rate,the type of biochar and the depth of packed *** optimal adsorption process was elected by the method of orthogonal *** data showed that using deeper packed biochar and applying lower flow rates could be a better strategy to increase NH^(+)_(4)-N *** maximum NH^(+)_(4)-N removal rate in the slurry could reach 85.60%in the three-stage adsorption *** concluded that NH^(+)_(4)-N adsorption in three-stage adsorption process could be an effective method to recover nitrogen from piggery manure anaerobic digestate.

关键词： modified biochar biogas slurry ammonium adsorption sorption characteristics

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