Abstract
• High Mn and NO 3 removal attained with date palm biochar in batch and column studies • 0.1 g dosage, 1200 min contact time at pH 6 were optimum conditions in batch studies • Bed depth, influent concentration, and flow rate affected removal rates in columns • The Mn and NO 3 levels in the treated groundwater met drinking water standards This study investigates the removal of manganese and nitrate from aqueous systems in batch and column studies using date palm waste-derived biochar. High removal efficiencies and adsorption capacities (73.20%, q e : 3.57 mg/g for manganese and 94.94%, q e : 4.18 mg/g for nitrate) were attained at pH 6 with a dosage of 0.1 g biochar derived from a 50/50% mixture of date palm leaves and fronds pyrolyzed at 500°C. The equilibrium data fits well to the Freundlich and Langmuir isotherm models for manganese and nitrate respectively with R 2 =1. The Freundlich model dictates that the biochar's surface is heterogeneous, and manganese adsorption can occur in multiple layers. According to the Langmuir model, nitrate adsorption takes place on a homogeneous layer, and no interactions are fostered between the nitrate molecules on the adsorbent layer. The pseudo-second order model was found most suitable for both manganese and nitrate with R 2 = 0.99 and 1, respectively. Results from the dynamic column study showed that increasing biochar bed depth and lowering the flow rate and influent concentration increased the removal efficiencies and adsorption capacities to 53.78 (q e : 8.54 mg/g) and 45.40% (q e : 4.39 mg/g) for manganese and nitrate, respectively. To confirm the adsorption of manganese and nitrate onto the biochar, physical and chemical characterization methods were used. The optimum conditions obtained from the dynamic column study were employed to study biochar efficiency to remove manganese and nitrate from synthetic groundwater in the presence of other cations and anions as field column study. The manganese and nitrate concentrations in the treated groundwater met World Health Organization drinking water standards.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
