We evaluated mercury (Hg) behavior in a full-scale sewage sludge torrefaction plant with a capacity of 150 wet tons/day, which operates under a nitrogen atmosphere at a temperature range of 250–350 °C. Thermodynamic calculations and monitoring results show that elemental Hg (Hg⁰) was the dominant species in both the pyrolysis gas during the torrefaction stage and in the flue gas from downstream air pollution control devices. A wet scrubber (WS) effectively removed oxidized Hg from the flue gas and moved Hg to wastewater, and an electrostatic precipitator (ESP) removed significant particulate-bound Hg but showed a limited capacity for overall Hg removal. Hg bound to total suspended solids had a much higher concentration than that of dissolved Hg in wastewater. Total suspended solid removal from wastewater is therefore recommended to reduce Hg discharge. Existing air pollution control devices, which consist of a cyclone, WS, and ESP, are not sufficient for Hg removal due to the poor Hg⁰ removal performance of the WS and ESP; a further Hg⁰ removal unit is necessary. A commercial packed tower with sorbent polymer catalyst composite material was effective in removing Hg (83.3%) during sludge torrefaction.

我们评估了产能为 150 湿吨/天的大型污水污泥烘焙厂的汞 (Hg) 行为，该厂在 250-350 °C 温度范围内的氮气气氛下运行。热力学计算和监测结果表明，元素 Hg (Hg ⁰) 是烘焙阶段的热解气体和下游空气污染控制装置的烟气中的主要成分。湿式洗涤器 (WS) 有效地去除了烟气中的氧化汞并将汞转移到废水中，而静电除尘器 (ESP) 去除了显着的颗粒结合汞，但整体去除汞的能力有限。与总悬浮固体结合的汞的浓度远高于废水中溶解汞的浓度。因此，建议从废水中去除总悬浮固体以减少汞排放。^{由于 WS 和 ESP 的 Hg 0}去除性能差，现有的由旋风分离器、WS 和 ESP 组成的空气污染控制装置不足以去除 Hg ；进一步的 Hg ⁰拆卸单元是必要的。具有吸附剂聚合物催化剂复合材料的商业填充塔在污泥烘焙过程中可有效去除 Hg (83.3%)。