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Improving heavy metals removal, dewaterability and pathogen removal of waste activated sludge using enhanced chemical leaching
Journal of Cleaner Production ( IF 11.1 ) Pub Date : 2020-06-15 , DOI: 10.1016/j.jclepro.2020.122512
Liguo Zhang , Ying Chen , Caixia Ma , Lei Liu , Jingshi Pan , Biqing Li , Xuewei Wu , Qilin Wang

In order to enhance heavy metals removal, two enhanced chemical leaching techniques were examined comparatively using NaClO and NaNO2 with the addition of FeCl3. The phosphorus release, dewaterability and pathogen removal of treated sludge were also examined after chemical leaching. The results showed that the heavy metals solubilization, improvement of dewaterability and pathogen removal were simultaneously achieved. Compared with NaClO treatment system, the better solubilization rates of Zn and Ni were observed in the NaNO2 treatment system. The improvement of Cu, Zn and Ni removal can be attributed to the disruption of the organically bound metal fraction based on metal distribution and EEM analysis. The TP loss caused by chemical leaching in this study was in the range of 47 %–54%. The treated sludge of the two systems could both meet Class A biosolids standards (US EPA) for land application. These results provided an alternative chemical leaching method for simultaneous improvement of sludge properties.



中文翻译:

通过增强的化学浸提法改善废活性污泥的重金属去除,脱水性和病原体去除

为了增强对重金属的去除,比较了使用NaClO和NaNO 2以及添加FeCl 3的两种增强化学浸出技术。化学浸出后还检查了处理后污泥的磷释放,脱水性和病原体去除。结果表明,重金属溶解,脱水能力提高和病原体去除同时实现。与NaClO处理系统相比,NaNO 2中锌和镍的增溶率更高处理系统。铜,锌和镍去除率的提高可归因于基于金属分布和EEM分析的有机结合金属馏分的破坏。在这项研究中,由化学浸出引起的TP损失在47%–54%的范围内。两种系统的处理后污泥均可以满足A类生物固体标准(美国EPA)的土地使用要求。这些结果提供了另一种化学浸出方法,可同时改善污泥特性。

更新日期:2020-07-07
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