Catizzone Enrico, Sposato Corradino, Romanelli Assunta, Barisano Donatella, Cornacchia Giacinto, Marsico Luigi, Cozza Daniela, Migliori Massimo
ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Trisaia Research Center, Department of Energy Technologies and Renewable Sources, I-75026 Rotondella, Italy.
Department of Environmental and Chemical Engineering, University of Calabria, via P. Bucci, 44a, I-87036 Rende, Italy.
Int J Environ Res Public Health. 2021 Apr 16;18(8):4247. doi: 10.3390/ijerph18084247.
Phenol is a major component in the scrubber wastewater used for syngas purification in biomass-based gasification plants. Adsorption is a common strategy for wastewater purification, and carbon materials, such as activated carbons and biochar, may be used for its remediation. In this work, we compare the adsorption behavior towards phenol of two biochar samples, produced by pyrolysis and gasification of lignocellulose biomass, with two commercial activated carbons. Obtained data were also used to assess the effect of textural properties (i.e., surface area) on phenol removal. Continuous tests in lab-scale columns were also carried out and the obtained data were processed with literature models in order to obtain design parameters for scale-up. Results clearly indicate the superiority of activated carbons due to the higher pore volume, although biomass-derived char may be more suitable from an economic and environmental point of view. The phenol adsorption capacity increases from about 65 m/g for gasification biochar to about 270 mg/g for the commercial activated carbon. Correspondingly, service time of commercial activated carbons was found to be about six times higher than that of gasification biochar. Finally, results indicate that phenol may be used as a model for characterizing the adsorption capacity of the investigated carbon materials, but in the case of real waste water the carbon usage rate should be considered at least 1.5 times higher than that calculated for phenol.
苯酚是生物质气化厂中用于合成气净化的洗涤器废水中的主要成分。吸附是废水净化的常用策略，碳材料，如活性炭和生物炭，可用于其修复。在这项工作中，我们比较了由木质纤维素生物质热解和气化产生的两种生物炭样品与两种商业活性炭对苯酚的吸附行为。获得的数据还用于评估结构性质（即表面积）对苯酚去除的影响。还进行了实验室规模柱的连续测试，并使用文献模型对获得的数据进行处理，以获得放大的设计参数。结果清楚地表明，由于孔体积较大，活性炭具有优越性，尽管从经济和环境角度来看，生物质衍生的炭可能更合适。苯酚吸附容量从气化生物炭的约65 m/g增加到商业活性炭的约270 mg/g。相应地，发现商业活性炭的服务时间比气化生物炭高约六倍。最后，结果表明，苯酚可作为表征所研究碳材料吸附容量的模型，但在实际废水的情况下，碳使用率应至少比按苯酚计算的使用率高1.5倍。
