Phosphorus Removal from Dirty Farmyard Water by Activated Anaerobic-Digestion-Derived Biochar
Date
2022-12-05
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Publisher
American Chemical Society
Abstract
The management of anaerobic digestate is important to realize the value of the waste and enhance the whole system
sustainability of anaerobic digestion. In this study, the phosphorus treatment of dirty irrigation water by biochar samples derived
from digestate of anaerobic digestion were investigated. The biochars were further activated by steam activation with different
duration time and KOH activation with different introducing ratios; the textural properties of biochars were optimized after
activation from the aspect of biochar characterization. Notably, AD-N2 demonstrates a remarkable adsorption effect of phosphorus,
with an adsorption efficiency of 8.99 mg g−1. Besides the effect of biochar dosage on phosphorus removal, adsorption kinetics and
thermodynamic isotherms are studied. According to the adsorption kinetics, the adsorption of phosphorus from dirty water fits the
Elovich equation (R2 = 0.95). Furthermore, the thermodynamic isotherm results illustrate the process of phosphorus removal by
biochar is endothermic (ΔH0 = 17.93 kJ mol−1) and spontaneous (ΔS = 96.24 J mol−1 K−1). Therefore, this work suggests a
promising solution to phosphorus-related environmental challenges in industry and agriculture.
Description
Publication history: Accepted - 21 November 2022; Published online - 5 December 2022.
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Keywords
Adsorption, Elements, Phosphorus, Sorbents, Thermodynamics
Citation
Zhang, C., Sun, S., Xu, S., Johnston, C. and Wu, C. (2022) ‘Phosphorus Removal from Dirty Farmyard Water by Activated Anaerobic-Digestion-Derived Biochar’, Industrial & Engineering Chemistry Research. American Chemical Society (ACS). Available at: https://doi.org/10.1021/acs.iecr.2c02668.