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Biochar derived from anaerobically digested sugar beet tailings: characterization and phosphate removal potential |
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| Authors: | Yao Ying Gao Bin Inyang Mandu Zimmerman Andrew R Cao Xinde Pullammanappallil Pratap Yang Liuyan |
| Institution: | a Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA b Department of Geological Sciences, University of Florida, Gainesville, FL 32611, USA c School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China d School of the Environment, Nanjing University, Nanjing 210046, China |
| Abstract: | Two biochars were produced from anaerobically digested and undigested sugar beet tailings through slow-pyrolysis at 600 °C. The digested sugar beet tailing biochar (DSTC) and raw sugar beet tailing biochar (STC) yields were around 45.5% and 36.3% of initial dry weight, respectively. Compared to STC, DSTC had similar pH and surface functional groups, but higher surface area, and its surface was less negatively charged. SEM-EDS and XRD analyses showed that colloidal and nano-sized periclase (MgO) was presented on the surface of DSTC. Laboratory adsorption experiments were conducted to assess the phosphate removal ability of the two biochars, an activated carbon (AC), and three Fe-modified biochar/AC adsorbents. The DSTC showed the highest phosphate removal ability with a removal rate around 73%. Our results suggest that anaerobically digested sugar beet tailings can be used as feedstock materials to produce high quality biochars, which could be used as adsorbents to reclaim phosphate. |
| Keywords: | Biochar Anaerobically digested residue Pyrolysis Physicochemical property Phosphate |
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