Abstract：
Considering the high organic matter contents and pollutants in sewage sludge (SS) and food waste (FW), seeking green and effective technology for energy recovery and pollutant control is a big challenge. In this study, we proposed a integrated technology combing SS mass separation by hydrothermal pretreatment, methane production from co-digestion of hydrothermally treated sewage sludge (HSS) centrate and FW, and biochar production from co-pyrolysis of HSS cake and digestate with heavy metal immobilization for synergistic utilization of SS and FW. The results showed that the co-digestion of HSS centrate with FW reduced the NH4+-N concentration and promoted volatile fatty acids conversion, leading to a more robust anaerobic system for better methane generation. Among the co-pyrolysis of HSS cake and digestate, digestate addition improved biochar quality with heavy metals immobilization and toxicity reduction. Following the lab-scale investigation, the pilot-scale verification was successfully performed (except the co-digestion process). The mass and energy balance revealed that the produced methane could supply the whole energy consumption of the integrated system with 26.2 t biochar generation for treating 300 t SS and 120 t FW. This study presents a new strategy and technology validation for synergistic treatment of SS and FW with resource recovery and pollutants control.
摘要：
考虑到污水污泥（SS）和餐厨垃圾（FW）中有机物含量和污染物含量高，寻求绿色有效的能源回收和污染物控制技术是一个巨大的挑战。在这项研究中,我们提出了一种通过水热预处理结合SS质量分离的集成技术，水热处理污水污泥(HSS)离心液和FW共消化产生甲烷，HSS饼和消化物与重金属固定化共热解生产生物炭，协同利用SS和FW。结果表明，HSS浓缩液与FW共消化降低了NH4+-N浓度，促进了挥发性脂肪酸的转化。导致更强大的厌氧系统更好的甲烷生成。在HSS饼和消化物的共热解中，消化物的添加提高了生物炭的质量，重金属固定化和毒性降低。在实验室规模的调查之后，成功进行了中试规模验证(共消化过程除外).质量和能量平衡表明，所产生的甲烷可以提供集成系统的全部能耗，产生26.2t生物炭，用于处理300tSS和120tFW。本研究提出了一种新的战略和技术验证，以协同处理SS和FW与资源回收和污染物控制。
