title: Evaluation of slow pyrolyzed wood and rice husks biochar for adsorption of ammonium nitrogen from piggery manure anaerobic digestate slurry.
abstract: Due to its high adsorption capacity, the use of biochar to capture excess nutrients from wastewater 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, pH and temperature were quantified in batch equilibrium and kinetics experiments. The maximum NH4(+)-N adsorption from slurry at 1400 mgN·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 (R(2)=0.995 and 0.998) and Pseudo-second order kinetic models (R(2)=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.
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, 100083 Beijing, PR China.
authors.forename: Simon
authors.initials: S
authors.lastname: Kizito
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, 100083 Beijing, PR China. Electronic address: wushubiao@gmail.com.
authors.forename: Shubiao
authors.initials: S
authors.lastname: Wu
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, 100083 Beijing, PR China.
authors.forename: W
authors.initials: W
authors.lastname: Kipkemoi Kirui
authors.affiliation: College of Agronomy and Biotechnology, China Agricultural University, 100083 Beijing, PR China.
authors.forename: Ming
authors.initials: M
authors.lastname: Lei
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, 100083 Beijing, PR China.
authors.forename: Qimin
authors.initials: Q
authors.lastname: Lu
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, 100083 Beijing, PR China.
authors.forename: Hamidou
authors.initials: H
authors.lastname: Bah
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, 100083 Beijing, PR China.
authors.forename: Renjie
authors.initials: R
authors.lastname: Dong
mesh_terms: D000327:Adsorption; D064751:Ammonium Compounds / Q000737:chemistry*; D000693:Anaerobiosis; D000818:Animals; D002606:Charcoal / Q000737:chemistry*; D008372:Manure; D009584:Nitrogen / Q000737:chemistry*; D013552:Swine; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014934:Wood
chemical_list: D064751:Ammonium Compounds; D008372:Manure; D014874:Water Pollutants, Chemical; C540010:biochar; D002606:Charcoal; D009584:Nitrogen
keywords: Ammonium adsorption; Biochar; Kinetics; Piggery manure anaerobic digestate; Thermodynamics