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Environmental Engineering Research 2019;24(3): 434-442. DOI: https://doi.org/10.4491/eer.2018.296
Adsorption of phosphate in water on a novel calcium hydroxide-coated dairy manure-derived biochar
Yong-Keun Choi1,2, Hyun Min Jang1, Eunsung Kan1,2  , Anna Rose Wallace3, and Wenjie Sun3
1Texas A&M AgriLife Research Center, Stephenville, TX 76401, USA
2Office of Sponsored Projects, Tarleton State University, Stephenville, TX 76401, USA
3Department of Civil and Environmental Engineering, Southern Methodist University, Dallas, TX 75205, USA
Corresponding Author: Eunsung Kan ,Tel: +1-254-968-4144 , Fax: +1-254-968-3759, Email: eunsung.kan@ag.tamu.edu
Received: August 16, 2018;  Accepted: October 24, 2018.
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The present study investigated a novel calcium hydroxide-coated dairy manure-derived biochar (Ca-BC) for adsorption of phosphate from water and dairy wastewater. The Ca-BC showed much higher adsorption of phosphate than that of dairy manure-derived biochar. The Ca-BC possessed mainly the calcium hydroxide and various functional groups resulting in high reactivity between phosphate and calcium hydroxide in the Ca-BC. The adsorption of phosphate onto Ca-BC followed pseudo-second order kinetic and Freundlich isotherm models indicating chemisorptive interaction occurred on energetically heterogeneous surface of Ca-BC. The maximum adsorption capacity of the Ca-BC was higher than those of iron oxide and zinc oxide-coated biochars, but lower than those of CaO- and MgO-coated biochars. However, the Ca-BC showed high reactivity per surface area for adsorption of phosphate indicating importance of surface functionalization of biochar. On the other hand, the adsorption of phosphate in dairy wastewater on Ca-BC was lower than that in water owing to competition between other anions in wastewater and phosphate. Overall, the Ca-BC would be a low cost and effective adsorbent for recovery of phosphate from water and wastewater.
Keywords: Adsorption | Biochar | Calcium hydroxide-coated biochar | Dairy wastewater | Phosphate
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