Heavy metal contamination in suspended solids of Changjiang River — environmental implications

Applied Heavy Metals Pollution Index (HPI) as a Water Pollution Indicator of Shatt Al-Arab River, Basrah-Iraq

“…The spatial elevated concentrations could be related to land-based point source discharges caused by rapid urbanization and economic development in Basrah city center, this finding was in agreement with Al-Hejuje (1997) and Zhang et al (2009), or may be due to a wide range of anthropogenic impacts linked to variations in population density, wastewater discharges and industrial activities. The river is extensively used for washing vehicle and the wastewater is drained back into the river, the vehicle emission which can travel for a long distance from the source of emission by atmospheric transport, traffic sources, and cities are the main sources of contaminations of heavy metals in the river (Song et al, 2010;Manoj et al, 2012). The fluctuation in the concentrations of heavy metals could be attributed to the interactions between multi factors that affect the concentrations of dissolved metals, such as the unequal amount s of sewage discharged, the phytoplankton and aquatic plants densities which absorbed or adsorbed the ionic metals, the sand storms occurring, and the fuel burn emissions specially during Summer as a result of electrical power generation machines that released large amounts of metals, especially lead compounds, into the river.…”

“…Most of heavy metals in particulate phase positively correlated with those in dissolved phase and this could be attributed to the same sources and the ability of suspended particulate to accumulate these metals from the surrounding water. Suspended solid is the same as the sediments that can scavenge and enrich the metals input into water (Song et al, 2010). This could be attributed to the ability of the particulate matter (especially the living phytoplankton) to concentrate the heavy elements in their bodies, or may be due to the considerable variations in partitioning between water and particulate matter.…”

Contamination of the soil and water environment by heavy metals in the former mining area of Rudňany (Slovakia)

“…Numerous anthropogenic sources of pollutants can contaminate the soil and water environment, including inputs from waste waters flowing from mines and waste storage, runoff of pesticides from agricultural land or atmospheric deposition (Song et al 2010). Increasing industrialization has been accompanied throughout the world by the extraction and distribution of mineral substances from their natural deposits.…”

An Upflow‐Type Filtration Device Using Expanded Polypropylene Media (EPM) to Treat First Flush of Rainwater

“…Cr, Pb, Zn are removed more than 90% by 30 minutes, whereas Cu removal is lower than 80%. Adsorption affinity of heavy metals on SS is well described by Song et al (2010) and Woitke et al (2003), where high concentrations of Cr, Pb, and Zn were found on SS, but less amount of Cu was adsorbed on SS. Most heavy metals in influent are attached to pollutant particles and can be efficiently removed.…”