Sustainable sewage sludge management is a worldwide issue in wastewater treatment plants (WWTPs). This work developed a new strategy for sewage sludge treatment involving the integration of hydrothermal treatment (HT) with anaerobic co-digestion (AcoD), particularly on the feasibility of mesophilic AcoD of anaerobically digested sludge (DS) hydrolysate and waste activated sludge (WAS). Results show that AcoD of DS hydrolysate from HT 170℃ for 30 min with WAS achieved the highest CH₄ production of 205.39 mL CH₄/g-VS_fed. By adopting the new AD-HT170-AcoD strategy, 61.88 mL CH₄/g-tVS_fed higher CH₄ yield and 22.2% more total solids (TS) reduction were obtained in addition to much better sludge settleability and 7.6% wt. less sludge cake production compared to the conventional mono AD. Although negative energy gain was obtained, the proposed AD-HT170-AcoD strategy is promising, economically feasible, and sustainable when the final sludge disposal of WAS is concerned in the context of whole WWTP.

可持续的污泥管理是废水处理厂（WWTP）中的一个全球性问题。这项工作制定了一种新的污水污泥处理策略，其中涉及将水热处理（HT）与厌氧共消化（AcoD）相结合，特别是关于厌氧消化污泥（DS）水解产物和废活性污泥（WAS）的中温AcoD可行性。结果表明，从HT 170℃与达到最高CH 30分钟DS水解物ACOD ₄生产205.39毫升的CH ₄ /克-VS_供给。通过采用新的AD-HT170-AcoD策略，可以使61.88 mL CH ₄ / g-tVS_喂入更高的CH ₄除了更好的污泥沉降性和7.6％的重量外，还获得了更高的收率和22.2％的总固体减少量。与传统的mono AD相比，污泥饼的产量更少。尽管获得了负能量收益，但是当在整个污水处理厂范围内关注WAS的最终污泥处置时，建议的AD-HT170-AcoD策略是有希望的，经济上可行的和可持续的。