含砷化合物用于治疗癌症已有几百年的历史。
Arsenic containing compounds have been used as cancer treatment for hundreds of years.
废水处理后的污泥含有大量的有害物质，其中的砷及其化合物对环境危害极大，因此，对含砷污泥的安全处理与处置研究，有重要的现实意义。
The arsenic in the sludge is very dangerous, so it is important to find the methods for the treatment and disposal of the arsenical sludge.
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