Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 10, Pages 6273-6278Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.03.006
Keywords
Biochar; Anaerobically digested residue; Pyrolysis; Physicochemical property; Phosphate
Funding
- USDA
- NSF [CBET-1054405]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1054405] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [819706] Funding Source: National Science Foundation
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Two biochars were produced from anaerobically digested and undigested sugar beet tailings through slow-pyrolysis at 600 degrees 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. (C) 2011 Elsevier Ltd. All rights reserved.
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