Dai Lichun, Tan Furong, Li Hong, Zhu Nengmin, He Mingxiong, Zhu Qili, Hu Guoquan, Wang Li, Zhao Jie
Biomass Energy Technology Research Center, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China.
Biomass Energy Technology Research Center, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China.
J Environ Manage. 2017 Aug 1;198(Pt 1):70-74. doi: 10.1016/j.jenvman.2017.04.057. Epub 2017 Apr 26.
Calcium-rich biochars (CRB) prepared through pyrolysis of crab shell at various temperatures were characterized for physicochemical properties and P removal potential. Elemental analysis showed that CRB was rich in calcium (22.91%-36.14%), while poor in carbon (25.21%-9.08%). FTIR, XRD and TG analyses showed that calcite-based CRB was prepared at temperature ≤600 °C, while lime-based CRB was prepared at temperature ≥700 °C. Phosphorus removal experiment showed that P removal efficiencies in 80 mg P/L phosphate solution and biogas effluent ranged from 26% to 11%, respectively, to about 100% and 63%, respectively, depending on the pyrolysis temperature of the resulting biochar. Specifically, compared to common used CaCO and Ca(OH), P removal potential of calcite-based CRB was much higher than that of CaCO; while that of lime-based CRB was close to that of Ca(OH). These results suggested that CRB was competent for P removal/recovery from wastewater.
通过在不同温度下对蟹壳进行热解制备的富钙生物炭（CRB），对其理化性质和磷去除潜力进行了表征。元素分析表明，CRB富含钙（22.91%-36.14%），而碳含量较低（25.21%-9.08%）。傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和热重分析（TG）表明，在温度≤600℃下制备的是方解石基CRB，而在温度≥700℃下制备的是石灰基CRB。磷去除实验表明，在80mg P/L的磷酸盐溶液和沼气废水中，磷的去除效率分别为26%至11%，根据所得生物炭的热解温度，分别提高到约100%和63%。具体而言，与常用的CaCO₃和Ca(OH)₂相比，方解石基CRB的磷去除潜力远高于CaCO₃；而石灰基CRB的磷去除潜力与Ca(OH)₂相近。这些结果表明，CRB能够从废水中去除/回收磷。
