Preparation of biochars from biogas residue and adsorption of ammonia-nitrogen in biogas slurry

以生物产甲烷的副产物沼渣为原料,用5种不同的方法通过化学活化法制备生物炭,实验结果表明5种生物炭对沼液中的氨氮都有吸附效果,而氢氧化钾活化制备的生物炭(kOH-CC)对氨氮的吸附效果相对较好,吸附剂对氨氮的吸附符合准二级吸附动力学,吸附等温线表现为lAngMuIr型,通过拟合计算最大吸附容量能达到120 Mg·g-1。对生物炭进行bET、扫描电镜及红外等表征,分析了kOH-CC生物炭吸附氨氮过程的作用机理。Five types of biochars were prepared through chemical activation utilizing fermentation residue from biogas plants.NaOH, KOH, H2SO4, H3PO4 and ZnCl2 were used as chemical activating agents.Biochars could absorb ammonia-nitrogen in biogas slurry.Biochar derived from KOH treatment(KOH-CC) showed better adsorption efficiency than the others.The adsorption process followed pseudo-second-order kinetics, and the adsorption isotherm could be fitted to Langmuir equation.Simulation test indicated that the maximum adsorption capacity could reach 120 mg·g-1.The properties of KOH-CC were characterized by BET, SEM, XRD and FTIR.The machanism of ammonia-nitrogen adsorption was discussed.国家重点基础研究发展计划项目(2013CB733505)~

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Preparation of biochars from biogas residue and adsorption of ammonia-nitrogen in biogas slurry

Five types of biochars were prepared through chemical activation utilizing fermentation residue from biogas plants. NaOH, KOH, H2SO4, H3PO4 and ZnCl2 were used as chemical activating agents. Biochars could absorb ammonia-nitrogen in biogas slurry. Biochar derived from KOH treatment (KOH-CC) showed better adsorption efficiency than the others. The adsorption process followed pseudo-second-order kinetics, and the adsorption isotherm could be fitted to Langmuir equation. Simulation test indicated that the maximum adsorption capacity could reach 120 mg·g-1. The properties of KOH-CC were characterized by BET, SEM, XRD and FTIR. The machanism of ammonia-nitrogen adsorption was discussed. ? All Rights Reserved