Full‐scale demonstration testing of hexavalent chromium reduction via stannous chloride application

Full‐scale demonstration testing of hexavalent chromium reduction via stannous chloride application
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通过氯化亚锡还原六价铬的全面示范测试

DOI:
10.1002/aws2.1136
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发表时间:
2019
期刊:
AWWA Water Science
影响因子:
--
通讯作者:
Liu, Haizhou
Liu, Haizhou
中科院分区:
--
文献类型:
--
作者:
Henrie, Tarrah;Plummer, Sarah;Orta, John;Bigley, Steve;Gorman, Craig;Seidel, Chad;Shimabuku, Kyle;Liu, Haizhou

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现有的最佳六价铬[Cr(VI)]处理技术可能成本高昂,操作复杂。直接应用氯化亚锡将Cr(VI)还原为三价铬是一种可大幅降低处理成本的替代处理方法。在Coachella Valley Water District进行了全面的演示,以研究Sn(II)在氯化地下水系统中还原Cr(VI)的能力。平均Sn(II)剂量为0.5 mg-Sn/L,相当于Cr(VI)还原的化学计量剂量比的约7.3倍,能够在30天的时间内将整个分配系统中的Cr(VI)维持在<10 μg/L。锡(Sn)和铬(Cr)的浓度随着距离的增加,从亚锡饲料的位置,这表明在分配系统中的积累。演示结束后,对分配系统管道结垢进行分析,发现管道结垢中存在锡和铬;然而,在演示结束时的主冲洗过程中,观察到锡和铬的释放量极小。
The best available technologies for hexavalent chromium [Cr(VI)] treatment can be cost prohibitive and operationally complex. Direct stannous [Sn(II)] chloride application to reduce Cr(VI) to trivalent chromium is an alternative treatment approach that could substantially decrease treatment costs. A full‐scale demonstration was conducted at the Coachella Valley Water District to investigate the ability of Sn(II) to reduce Cr(VI) in a chlorinated groundwater system. An average Sn(II) dose of 0.5 mg‐Sn/L, which corresponds to ~7.3 times the stoichiometric dose ratio for Cr(VI) reduction, was able to maintain Cr(VI) at <10 μg/L throughout the distribution system over a 30‐day period. Tin (Sn) and chromium (Cr) concentrations decreased with increasing distance from stannous feed locations, suggesting accumulation in the distribution system. Distribution system pipe‐scale analysis after the demonstration found the presence of Sn and Cr in pipe scales; however, minimal Sn and Cr release was observed during main flushing at the end of the demonstration.
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影响因子: 11.4
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