Sewage sludge from a biological wastewater treatment plant was converted into sewage sludge based activated carbon（SBAC） with Zn Cl2 as activation agent, which was used as a support for ferric oxides to form a catal...Sewage sludge from a biological wastewater treatment plant was converted into sewage sludge based activated carbon（SBAC） with Zn Cl2 as activation agent, which was used as a support for ferric oxides to form a catalyst（Fe Ox/SBAC） by a simple impregnation method.The new material was then used to improve the performance of Fenton oxidation of real biologically pretreated coal gasification wastewater（CGW）. The results indicated that the prepared Fe Ox/SBAC significantly enhanced the pollutant removal performance in the Fenton process, so that the treated wastewater was more biodegradable and less toxic. The best performance was obtained over a wide p H range from 2 to 7, temperature 30°C, 15 mg/L of H2O2 and 1 g/L of catalyst, and the treated effluent concentrations of COD, total phenols,BOD5 and TOC all met the discharge limits in China. Meanwhile, on the basis of significant inhibition by a radical scavenger in the heterogeneous Fenton process as well as the evolution of FT-IR spectra of pollutant-saturated Fe Ox/BAC with and without H2O2, it was deduced that the catalytic activity was responsible for generating hydroxyl radicals, and a possible reaction pathway and interface mechanism were proposed. Moreover, Fe Ox/SBAC showed superior stability over five successive oxidation runs. Thus, heterogeneous Fenton oxidation of biologically pretreated CGW by Fe Ox/SBAC, with the advantages of being economical, efficient and sustainable, holds promise for engineering application.展开更多
针对生物质气化再燃技术路线中焦油的价值及利用开展研究。通过热重-质谱联用仪分析典型农业废弃物在热解、气化过程中焦油组分的析出情况,并在管式流动实验台上研究焦油在生物质气化气还原NO中的作用以及焦油还原NO受当量比、温度等因...针对生物质气化再燃技术路线中焦油的价值及利用开展研究。通过热重-质谱联用仪分析典型农业废弃物在热解、气化过程中焦油组分的析出情况,并在管式流动实验台上研究焦油在生物质气化气还原NO中的作用以及焦油还原NO受当量比、温度等因素的影响规律,最后建立了甲苯还原NO的机制模型,并以停流动实验台的实验结果进行了验证。结果表明:苯、甲苯、苯乙烯和苯酚是具有代表性的焦油组分;焦油对生物质气化气还原NO有积极的作用;焦油组分还原NO存在最佳的当量比,并要求合适的温度窗口,需要关注聚合反应;甲苯还原NO机制(NO reduction by toluene,NRT)模型与实验结果拟合良好,模型的生成速率和消耗速率分析显示HCCO和C2H在焦油还原NO中具有重要作用。展开更多
基金supported by the State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) (No.2015DX02)
文摘Sewage sludge from a biological wastewater treatment plant was converted into sewage sludge based activated carbon（SBAC） with Zn Cl2 as activation agent, which was used as a support for ferric oxides to form a catalyst（Fe Ox/SBAC） by a simple impregnation method.The new material was then used to improve the performance of Fenton oxidation of real biologically pretreated coal gasification wastewater（CGW）. The results indicated that the prepared Fe Ox/SBAC significantly enhanced the pollutant removal performance in the Fenton process, so that the treated wastewater was more biodegradable and less toxic. The best performance was obtained over a wide p H range from 2 to 7, temperature 30°C, 15 mg/L of H2O2 and 1 g/L of catalyst, and the treated effluent concentrations of COD, total phenols,BOD5 and TOC all met the discharge limits in China. Meanwhile, on the basis of significant inhibition by a radical scavenger in the heterogeneous Fenton process as well as the evolution of FT-IR spectra of pollutant-saturated Fe Ox/BAC with and without H2O2, it was deduced that the catalytic activity was responsible for generating hydroxyl radicals, and a possible reaction pathway and interface mechanism were proposed. Moreover, Fe Ox/SBAC showed superior stability over five successive oxidation runs. Thus, heterogeneous Fenton oxidation of biologically pretreated CGW by Fe Ox/SBAC, with the advantages of being economical, efficient and sustainable, holds promise for engineering application.
文摘针对生物质气化再燃技术路线中焦油的价值及利用开展研究。通过热重-质谱联用仪分析典型农业废弃物在热解、气化过程中焦油组分的析出情况,并在管式流动实验台上研究焦油在生物质气化气还原NO中的作用以及焦油还原NO受当量比、温度等因素的影响规律,最后建立了甲苯还原NO的机制模型,并以停流动实验台的实验结果进行了验证。结果表明:苯、甲苯、苯乙烯和苯酚是具有代表性的焦油组分;焦油对生物质气化气还原NO有积极的作用;焦油组分还原NO存在最佳的当量比,并要求合适的温度窗口,需要关注聚合反应;甲苯还原NO机制(NO reduction by toluene,NRT)模型与实验结果拟合良好,模型的生成速率和消耗速率分析显示HCCO和C2H在焦油还原NO中具有重要作用。
