College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China; Science and Engineering Faculty, Queensland University of Technology (QUT), GPO Box 2434, Brisbane, Qld, 4001, Australia.
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China; Science and Engineering Faculty, Queensland University of Technology (QUT), GPO Box 2434, Brisbane, Qld, 4001, Australia; Shenzhen Key Laboratory of Environmental Chemistry and Ecological Remediation, Shenzhen, 518060, China.
Water Res. 2019 Nov 1;164:114911. doi: 10.1016/j.watres.2019.114911. Epub 2019 Jul 24.
The high pollutant loads discharged from cities pose risks to urban waterways, and in turn the estuarine environments, making it challenging to improve urban liveability. Past studies on the behaviour of pollutants in rivers have largely investigated their transport along the waterway, primarily focusing on the movement of water and sediment. However, the current approaches in pollutant transport modelling provide limited insights into how pollutant transfer between water and sediment phases influences their transport from the upstream towards the estuarine environment. This research study firstly identified typical patterns of metal loads along an urban river in a highly populated city in China. The outcomes were then used to conceptualise metal transfer between water and sediment phases. It was noted that physico-chemical characteristics of water and sediments play a key role in metal transfer between the two phases, and the dominant transfer path (sediment to water/water to sediment) is different between different metals, independent of their origin (crustal, anthropogenic or marine-related). Several scenarios were derived from the conceptualisation of metal behaviour. These in turn were then used to develop real-world scenarios of metal transport in rivers based on the field data. The conceptualisation of metal behaviour confirmed that each metal is likely to have a dominant phase of transport (sediment/water), which is influenced by the dominant transfer path of that metal between water and sediments.
城市排放的高污染物负荷对城市水道构成威胁，进而对河口环境构成威胁，使得提高城市宜居性变得具有挑战性。过去对河流中污染物行为的研究主要调查了它们在水道中的运输情况，主要侧重于水和泥沙的运动。然而，目前的污染物输运模型方法提供的关于水沙相间污染物迁移如何影响其从上游向河口环境输运的见解有限。本研究首先确定了中国一个人口稠密城市的一条城市河流中金属负荷的典型模式。然后，将结果用于概念化水沙相间金属迁移。研究结果表明，水和沉积物的物理化学特性在两相之间的金属迁移中起着关键作用，不同金属之间的主要迁移路径（泥沙向水/水向泥沙）因金属来源（地壳、人为或与海洋有关）的不同而不同。从金属行为的概念化中得出了几个情景。然后，根据现场数据，将这些情景进一步用于开发河流中金属输运的实际情景。金属行为的概念化证实，每种金属都可能具有主要的输运相（泥沙/水），这受到该金属在水沙相间主要迁移路径的影响。
