State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
Environ Sci Pollut Res Int. 2017 Aug;24(24):19920-19926. doi: 10.1007/s11356-017-9637-6. Epub 2017 Jul 8.
In this study, an integrated two-stage system, including the in-situ catalytic microwave pyrolysis (ICMP) and subsequent catalytic wet oxidation (CWO) processes, was proposed to remove HS released from microwave-induced pyrolysis of sewage sludge. The emission profile and HS removal from the pyrolysis of raw sewage sludge (SS) and sewage sludge spiked with conditioner CaO (SS-CaO) were investigated. The results showed that CaO played a positive role on sulfur fixation during the pyrolysis process. It was found that SS-CaO (10 wt.%) contributed to about 35% of HS removal at the first stage (ICMP process). Additionally, the CWO process was demonstrated to have promising potential for posttreatment of remaining HS gas. At the Fe concentration of 30 g/L, the maximum HS removal efficiency of 94.8% was obtained for a single Fe/Cu solution. Finally, at the pyrolysis temperature of 800 °C, 99.7% of HS was eliminated by the integrated two-stage system meeting the discharge standard of China. Therefore, the integrated two-stage system of ICMP + CWO may provide a promising strategy to remove HS dramatically for the biomass pyrolysis industry.
在这项研究中，提出了一种包括原位催化微波热解（ICMP）和随后的催化湿式氧化（CWO）过程的集成两阶段系统，用于去除从污水污泥微波诱导热解中释放的 HS。研究了原始污水污泥（SS）和添加调理剂 CaO 的污水污泥（SS-CaO）热解过程中的排放特征和 HS 去除。结果表明，CaO 在热解过程中对硫固定起到了积极作用。发现 SS-CaO（10wt.%）在第一阶段（ICMP 过程）有助于去除约 35%的 HS。此外，CWO 过程被证明对剩余 HS 气体的后处理具有很大的潜力。在 Fe 浓度为 30g/L 时，单一 Fe/Cu 溶液的 HS 去除效率最高可达 94.8%。最后，在 800°C 的热解温度下，集成的 ICMP+CWO 两阶段系统可去除 99.7%的 HS，达到中国排放标准。因此，ICMP+CWO 的集成两阶段系统可能为生物质热解行业提供一种去除 HS 的有前途的策略。
