To fully dispose of/utilize sewage sludge, a process combing hydrothermal pretreatment (HTPT), anaerobic digestion (AD) and pyrolysis was developed and tested at the pilot scale. First, the improvement in sludge dewaterability by HTPT at 180 °C for 30 min was verified, and the water content decreased from 85 to 33 wt% after filter pressing. Then, the resulting filtrate underwent continuous mesophilic (37 ± 2 °C) AD in an up-flow anaerobic sludge bed (UASB) reactor for producing biogas to compensate for the energy required for HTPT. Meanwhile, the filter cake was pyrolyzed in a rotary furnace (600 ± 50 °C) to generate biochar, and heavy metals were well immobilized in the biochar. Finally, the material/energy balance made according to the pilot data showed that the proposed process was effective for full resource reuse of sewage sludge.

为了充分处理/利用污水污泥，开发了结合水热预处理（HTPT），厌氧消化（AD）和热解的工艺，并在中试规模下进行了测试。首先，证实了HTPT在180°C下处理30分钟可改善污泥的脱水性，压滤后水含量从85 wt％降低至33 wt％。然后，将所得滤液在上流厌氧污泥床（UASB）反应器中进行连续中温（37±2°C）AD，以生产沼气以补偿HTPT所需的能量。同时，将滤饼在旋转炉（600±50℃）中热解以产生生物炭，并将重金属很好地固定在生物炭中。最后，根据试验数据得出的材料/能量平衡表明，所提出的方法对于污水污泥的全部资源再利用是有效的。