剩余污泥微波热解技术研究进展

Technology developments of sewage sludge pyrolysis by microwave

剩余污泥的产量大,处理处置费用高,已成为困扰污水处理厂的难题。在惰性条件下热解剩余污泥生成生物油、生物气以及污泥生物炭等产物,可实现能量和资源的同步回收,应用前景极为广阔。本文总结了目前对于污泥特性、热解温度、升温速率、微波吸收剂、化学添加剂、载气对剩余污泥微波热解的影响的研究,并探讨了污泥热解机制,为微波热解剩余污泥提供了关键技术的参数,利于提高污泥热解效率,优化热解产物品质,为促进污泥微波热解系统化、产业化提供技术支持。同时指出了污泥微波热解受限于微波热解设备,致使其处理投资成本高及处理量小,为污泥微波热解工业化提出了巨大的挑战。最后展望了污泥微波热解的发展趋势及应注重攻克的关键问题。

The amount of excess sludge production rapidly increases with fast development of wastewater treatment,resulting in the challenge of sewage sludge treatment and disposal for municipal wastewater treatment plants. This paper reviewed and summarized the recent technology developments on sludge pyrolysis and microwave-assisted pyrolysis,and discussed the critical parameters of the microwave-assisted pyrolysis process and its advantages ＆amp; disadvantages,including temperature, ramp time of temperature,microwave absorbent,catalyst and carrier gas. It is emphasized that microwave-assisted pyrolysis technology is cost-effective to reduce the pyrolysis reaction time and improve the quality of value-added products. In addition,the future trends of microwave pyrolysis process and key points in sewage sludge treatment were discussed.