Abstract Municipal sludge disposal and recycle has become a prominent research theme. In this study, a sequential process for integral treatment of municipal sludge was primarily presented, combining acid leaching, anion exchange and aerobic composting. The aim of the process was to remove chromium (Cr) from the sludge and reuse the sludge as manure. Firstly, Cr was removed from municipal sludge via the acid leaching process; the removal rate was up to 57.43%. Then, ion exchange resin was used to remove Cr from leachate; the removal rate reached 95%. Aluminum sheet was used to replace the Cr from eluent; the replacement rate was 63.3%. The aerobic composting process could be successfully warmed up to above 55 °C and lasted for 4 days; the seed germination index reached 68.3%. After the composting process, the residual Cr in sludge mainly existed at a more stable residual state and organic binding state. Overall, this novel sequential process serves as a potential high-efficiency, green, low-energy way for municipal sludge recycle.

中文翻译：

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城市污泥循环利用“酸浸-阴离子交换-好氧堆肥”工艺

摘要城市污泥处置与资源化已成为突出的研究主题。本研究首次提出了酸浸、阴离子交换和好氧堆肥相结合的城市污泥一体化处理连续工艺。该过程的目的是从污泥中去除铬（Cr）并将污泥作为肥料重新利用。首先，通过酸浸工艺从城市污泥中去除Cr；去除率高达57.43%。然后采用离子交换树脂去除渗滤液中的Cr；去除率达到95%。用铝片代替淋洗液中的Cr；替代率为63.3%。好氧堆肥过程可成功升温至55℃以上并持续4天；种子发芽指数达到68.3%。堆肥处理后，污泥中的残留Cr主要以较稳定的残留态和有机结合态存在。总体而言，这种新颖的顺序工艺是城市污泥回收的一种潜在的高效、绿色、低能耗的方式。