Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Bioresour Technol. 2018 Jan;247:282-290. doi: 10.1016/j.biortech.2017.09.090. Epub 2017 Sep 18.
The heavy metals distribution during hydrothermal carbonization (HTC) of sewage sludge, and pyrolysis of the resultant hydrochar was investigated and compared with raw sludge pyrolysis. The results showed that HTC reduced exchangeable/acid-soluble and reducible fraction of heavy metals and lowered the potential risk of heavy metals in sewage sludge. The pyrolysis favored the transformation of extracted/mobile fraction of heavy metals to residual form especially at high temperature, immobilizing heavy metals in the chars. Compared to the chars from raw sludge pyrolysis, the chars derived from hydrochar pyrolysis was more alkaline and had lower risk and less leachable heavy metals, indicating that pyrolysis imposed more positive effect on immobilization of heavy metals for the hydrochar than for sewage sludge. The present study demonstrated that HTC is a promising pretreatment prior to pyrolysis from the perspective of immobilization of heavy metals in sewage sludge.
研究了污水污泥水热碳化（HTC）过程中重金属的分布情况，并将其与原污泥热解进行了比较。结果表明，HTC 降低了重金属的可交换/酸溶性和可还原部分，降低了污泥中重金属的潜在风险。热解有利于提取/移动部分重金属向残余形式的转化，特别是在高温下，将重金属固定在炭中。与原污泥热解得到的炭相比，水热炭热解得到的炭呈碱性，重金属风险和浸出性较低，表明热解对水热炭中重金属的固定作用比对污泥更有利。本研究表明，从重金属在污泥中的固定角度来看，HTC 是一种很有前途的热解预处理方法。
