Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA.
Bioresour Technol. 2011 May;102(10):6273-8. doi: 10.1016/j.biortech.2011.03.006. Epub 2011 Mar 29.
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.
两种生物炭是通过在 600°C 下慢速热解厌氧消化和未消化的糖甜菜渣制成的。消化的糖甜菜渣生物炭（DSTC）和原始糖甜菜渣生物炭（STC）的产率分别约为初始干重的 45.5%和 36.3%。与 STC 相比，DSTC 的 pH 值和表面官能团相似，但表面积更大，表面带负电荷的程度较低。SEM-EDS 和 XRD 分析表明，胶体和纳米级尖晶石（MgO）存在于 DSTC 的表面。进行了实验室吸附实验，以评估两种生物炭、一种活性炭（AC）和三种 Fe 改性生物炭/AC 吸附剂的磷酸盐去除能力。DSTC 表现出最高的磷酸盐去除能力，去除率约为 73%。我们的结果表明，厌氧消化的糖甜菜渣可用作生产高质量生物炭的原料，这些生物炭可用作吸附剂来回收磷酸盐。
