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

doi:10.3969/j.issn.0438-1157.2014.05.042

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

ZHENG Yangqing¹, YU Qiangqiang¹, WANG Haitao¹, WANG Yuanpeng¹, HE Ning¹, SHEN Liang¹, LI Qingbiao^1,2

1 Department of Chemical and Biochemical Engineering, School of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
2 School of Chemistry and Life Science, Quanzhou Normal University, Quanzhou 362000, Fujian, China

Received:2013-12-31 Revised:2014-01-19 Online:2014-05-05 Published:2014-05-05
Supported by:
supported by the National Basic Research Program of China(2013CB733505).

沼渣制备生物炭吸附沼液中氨氮

郑杨清¹, 郁强强¹, 王海涛¹, 王远鹏¹, 何宁¹, 沈亮¹, 李清彪^1,2

1 厦门大学化学化工学院化学工程与生物工程系, 福建厦门 361005;
2 泉州师范学院化学与生命科学学院, 福建泉州 362000

通讯作者: 李清彪
基金资助:
国家重点基础研究发展计划项目（2013CB733505）。

Abstract

Abstract: Five types of biochars were prepared through chemical activation utilizing fermentation residue from biogas plants. NaOH, KOH, H₂SO_4,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.

Key words: methane, biogas residue, biochar, adsorption, ammonia-nitrogen, sorbent

摘要： 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。

关键词: 甲烷, 沼渣, 生物炭, 吸附, 氨氮, 吸附剂

CLC Number:

X703.1

ZHENG Yangqing, YU Qiangqiang, WANG Haitao, WANG Yuanpeng, HE Ning, SHEN Liang, LI Qingbiao. Preparation of biochars from biogas residue and adsorption of ammonia-nitrogen in biogas slurry[J]. CIESC Journal, DOI: 10.3969/j.issn.0438-1157.2014.05.042.

郑杨清, 郁强强, 王海涛, 王远鹏, 何宁, 沈亮, 李清彪. 沼渣制备生物炭吸附沼液中氨氮[J]. 化工学报, DOI: 10.3969/j.issn.0438-1157.2014.05.042.

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

沼渣制备生物炭吸附沼液中氨氮

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