Evaluation of slow pyrolyzedwood and rice husks biochar for adsorption of ammonium nitrogen from piggery manure anaerobic digestate slurry
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Date
2015
Journal Title
Journal ISSN
Volume Title
Publisher
Science of the Total Environment,
Abstract
Due to its high adsorption capacity, the use of biochar to capture excess nutrients fromwastewater has become a
central focus in environmental remediation studies. In this study, its potential use in adsorption and removal of
ammonium in piggery manure anaerobic digestate slurry was investigated. The adsorbed amount of NH4
+-N
(mg·g−1) and removal percentage as a function of adsorbent mass in solution, adsorbent particle size, NH4
+-N
concentration in the effluent, contact time, pHand temperaturewere quantified in batch equilibriumand kinetics
experiments. The maximum NH4
+-N adsorption from slurry at 1400 mg N·L−1 was 44.64 ± 0.602 mg·g−1 and
39.8 ± 0.54 mg·g−1 for wood and rice husk biochar, respectively. For both biochars, adsorption increased with
increase in contact time, temperature, pH and NH4
+-N concentration but it decreased with increase in biochar
particle size. Furthermore, the sorption process was endothermic and followed Langmuir (R2 = 0.995 and
0.998) and Pseudo-second order kinetic models (R2 = 0.998 and 0.999). Based on the removal amounts, we
concluded that rice husk and wood biochar have potential to adsorb NH4
+-N from piggery manure anaerobic
digestate slurry, and thus can be used as nutrient filters prior to discharge into water streams.
Description
Keywords
Biochar, Piggery manure anaerobic digestate, Ammonium adsorption, Kinetics, Thermodynamics
Citation
Kizito, S., Wu, S., Kirui, W. K., Lei, M., Lu, Q., Bah, H., & Dong, R. (2015). Evaluation of slow pyrolyzed wood and rice husks biochar for adsorption of ammonium nitrogen from piggery manure anaerobic digestate slurry. Science of the Total Environment, 505, 102-112. http://dx.doi.org/10.1016/j.scitotenv.2014.09.096