Variation in properties of the sediment following electrokinetic treatments
Variation in properties of the sediment following electrokinetic treatments
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DOI：
10.1080/09593330.2016.1190408
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发表时间：
2017-02
影响因子：
2.8
通讯作者：
N. Touch;T. Hibino;S. Nakashita;K. Nakamoto
中科院分区：
文献类型：
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作者：
N. Touch;T. Hibino;S. Nakashita;K. Nakamoto
摘要许多研究报道了动电处理（EKT）中沉积物性质的变化。然而，我们的目标是通过实验室实验来揭示EKT之后沉积物性质的变化。我们从沿岸的地区收集了污水衍生的沉积物，并将其通过2 mm的筛子。我们用恒电位仪在EKT中产生电流。我们测量了沉积物的性质，如pH值，氧化还原电位（ORP），硫化氢（H2S）浓度在EKT结束时，并在30天后EKT。结果表明，在EKT结束时，pH值降低，ORP增加，H2S浓度降低。与未进行EKT的沉积物相比，在EKT后30天，EKT内沉积物的ORP下降幅度更大。这表明，厌氧消化的有机化合物发生在沉积物后EKT，其中的氧化剂EKT作为电子受体和有机化合物作为电子供体。此外，我们发现，EKT可以从沉积物中去除H2S，并减少H2S的产生在沉积物中的EKT相比，没有EKT的情况下。这些确保EKT可用于去除H2S并控制沉积物中的H2S产生。
ABSTRACT Many studies have reported variation in properties of the sediment within electrokinetic treatments (EKTs). However, we aim to reveal the variation in properties of the sediment following EKTs through laboratory experiments. We collected sewage-derived sediment from a littoral region, and passed it through a 2-mm sieve. We used a potentiostat to cause electrical current in EKT. We measured the sediment properties such as pH, redox potential (ORP), and hydrogen sulphide (H2S) concentration at the end of EKT and at 30 days following EKT. Results showed decreases in pH, increases in ORP, and decreases in H2S concentration at the end of EKT. Compared with the sediment without EKT, the decrease in ORP for the sediment within EKT was higher at 30 days following EKT. These suggest that anaerobic digestion of organic compounds occurs in the sediment following EKT, of which the oxidants produced by EKT serve as electron acceptors and organic compounds serve as electron donors. Furthermore, we found that EKT can remove H2S from the sediment and reduce H2S production in the sediment within EKT when compared to the case without EKT. These ensure that EKT can be used to remove H2S and control H2S production in the sediment.