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22. Adsorption characteristic of organic matter by low-temperature dry cattle manure-derived anaerobic digestion

Author

Zhu, Yao, Yi, Baojun, Zong, Zhixi, Yang, Xueqi, Chen, Meijing, and Yuan, Qiaoxia

Abstract

Anaerobic digestion (AD) prepared with the biogas industry can be utilised to adsorb organic matter in wastewater for realising the resource utilisation of AD. The low-temperature dry cattle manure-derived anaerobic digestion (CMAD) is a potential method for preparing adsorbents. Slow pyrolytic carbon (CMSP) and fast pyrolytic carbon (CMFP) are prepared to compare the adsorption capacity of CMAD. This study conducts the characteristic tests, adsorption experiments and isotherm and kinetics analyses of these samples. Results show that the surface functional groups of CMAD are abundant, and the surface area is small. The adsorptions of Methylene blue (MB) on CMSP, CMFP and CMAD reach a slow adsorption process at 240, 360 and 120 min, respectively. The maximum removal amounts by CMSP, CMFP and CMAD are 96.88%, 53.03% and 95.72% for MB. The adsorption of MB and Congo red (CR) by CMAD appears as a heterogeneous monolayer on the basis of adsorption isotherm and kinetics. The adsorptions of MB and CR by CMAD are chemical and physical adsorptions, respectively. CMAD can be utilised as an adsorbent due to its rich functional groups. In the meantime, its adsorption performance can be largely enhanced by improving its specific surface area.

Published
2021
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