Principle and Process of Heavy Metal Removal from Sewage Sludge
Principle and Process of Heavy Metal Removal from Sewage Sludge
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DOI：
10.1021/es990979s
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发表时间：
2000-03
影响因子：
11.4
通讯作者：
S. Yoshizaki;T. Tomida
中科院分区：
文献类型：
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作者：
S. Yoshizaki;T. Tomida
从污水污泥中充分去除重金属仍有待实现。存在于污泥中微生物细胞表面的重金属似乎被酸处理溶解了。本研究表明，在室温下，用含双氧水的磷酸处理污泥滤饼1 h，可以很容易地去除污水污泥中的重金属。过氧化氢加8%浓度的磷酸对重金属的去除率与1 N盐酸相当。在过氧化氢的存在下，铜很容易从污泥中除去。从几种铜化合物在有或没有过氧化氢的情况下对磷酸的溶解度的研究结果来看，污泥中的铜不以硫化铜的形式存在，而似乎以含Cu(I)的硫酸铜的形式存在于生物聚合物中。在此过程中，用于去除重金属的磷酸几乎完全回收并重复使用。污水sl……
The sufficient removal of heavy metals from sewage sludge remains to be achieved. Heavy metals that exist on the cell surfaces of the microorganisms in the sludge seem to be dissolved by acid treatments. This study shows that heavy metals in sewage sludge can be removed easily by treating a sludge filter cake with phosphoric acid containing hydrogen peroxide for 1 h at room temperature. Phosphoric acid of 8% concentration with hydrogen peroxide showed good removal rates of heavy metals comparable to those by 1 N hydrochloric acid. Copper is easily removed from the sludge in the presence of hydrogen peroxide. From the results of the investigation of the solubilities of several copper compounds into phosphoric acid with or without hydrogen peroxide, the copper in the sludge does not exist as copper sulfides, but it seems to exist as copper thiolates containing Cu(I) in biopolymers. In this process, the phosphoric acid used for the removal of heavy metals is almost entirely recovered and is reused. Sewage sl...