与 CaCO 共沉淀去除重金属并显著降低滤渣的含水量。
Co-precipitation with CaCO to remove heavy metals and significantly reduce the moisture content of filter residue.
机构信息
College of Chemistry and Environmental Engineering, Shenzhen University, 518061, Shenzhen, Guangdong, China; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 100085 Beijing, China.
School of Resources & Environmental Engineering, Wuhan University of Technology, 430070 Wuhan, Hubei, China.
出版信息
Chemosphere. 2020 Jan;239:124660. doi: 10.1016/j.chemosphere.2019.124660. Epub 2019 Aug 24.
The co-precipitation of Fe, Cu, Zn, Cd and Ni were investigated by a mechanochemical processing with CaCO. The results showed that the synergies of the metal ions led to efficient co-precipitation. The precipitation of Fe, Cu and Cd are over 99% and that of Zn and Ni about 98.4% and 93.8%. A significant advantage of the process is that the moisture content of filter residue is much lower (less than 50%) than that using the lime neutralization (more than 80%), offering a potential solution to the sludge problem in wastewater treatment. A further advantage is the neutral pH (about 7.5) obtained by using CaCO rather than the highly alkaline pH (about 11) obtained using lime (Ca(OH)) neutralization method.
采用机械化学法与碳酸钙共沉淀 Fe、Cu、Zn、Cd 和 Ni。结果表明，金属离子的协同作用导致了高效共沉淀。Fe、Cu 和 Cd 的沉淀率超过 99%，Zn 和 Ni 的沉淀率约为 98.4%和 93.8%。该工艺的一个显著优点是滤渣的水分含量低得多（低于 50%），而石灰中和法的水分含量高（超过 80%），这为解决废水处理中的污泥问题提供了一种潜在的解决方案。另一个优点是使用碳酸钙得到的 pH 值接近中性（约 7.5），而使用石灰（Ca(OH)）中和法得到的 pH 值则很高（约 11）。
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