ZHENG Yangqing, YU Qiangqiang, WANG Haitao, et al. Preparation of biochars from biogas residue and adsorption of ammonia-nitrogen in biogas slurry[J]. CIESC Journal, 2014, (5).
ZHENG Yangqing, YU Qiangqiang, WANG Haitao, et al. Preparation of biochars from biogas residue and adsorption of ammonia-nitrogen in biogas slurry[J]. CIESC Journal, 2014, (5).DOI: 10.3969/j.issn.0438-1157.2014.05.042.
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.