Karbassi Abdolreza, Marefat Ali
Graduate Faculty of Environmental, University of Tehran, P.O. Box 14155-6135, Tehran, Iran.
Mar Pollut Bull. 2017 Aug 15;121(1-2):168-175. doi: 10.1016/j.marpolbul.2017.06.011.
Similar to natural filters, estuaries are capable of removing considerable amounts of heavy metal from rivers that flow into saline water environments by turning the metal into flocs. The research objective was to investigate the self-purification potential of estuaries in removal of metal by flocculation processes. Hence, flocculation of metal was studied experimentally in 5 aquaria with varying salinity levels. Subsequently, experiment was repeated while dissolved oxygen increased. Results indicated that at higher dissolved oxygen, the flocculation rates of Mn, Ni, and Pb increased by 9%, 20%, and 26%, respectively. However, Zn and Cu showed 23% and 26% of decrease in flocculation rate, respectively. In the analysis of the relationship between oxidation reduction potential and estuarine water quality it was found that ORP escalated with an increase in the dissolved oxygen. This finding suggests that ORP can be used to govern the potential of flocculation processes at estuarine zone.
与天然过滤器类似，河口能够通过将金属转化为絮凝物，从流入咸水环境的河流中去除大量重金属。该研究的目的是调查河口通过絮凝过程去除金属的自净潜力。因此，在5个盐度水平不同的水族箱中对金属的絮凝进行了实验研究。随后，在溶解氧增加的情况下重复实验。结果表明，在较高的溶解氧条件下，锰、镍和铅的絮凝率分别提高了9%、20%和26%。然而，锌和铜的絮凝率分别下降了23%和26%。在分析氧化还原电位与河口水质之间的关系时发现，氧化还原电位随着溶解氧的增加而升高。这一发现表明，氧化还原电位可用于控制河口区域絮凝过程的潜力。
