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Based on the laboratory experiment, the variation of the fraction transformations and mobility of Cu and Zn in municipal sludge with pH were discussed in this study. The results show that pH has an important influence on the fraction transformations and mobility of Cu and Zn. The oxidizable fraction and residual fraction are the main ones of Cu in sludge solutions, While the percentage of acid soluble...
The contents of some heavy metals (Cu, Zn, Pb, Cd and Cr) in dustfall samples from different city zones of Quanzhou were analyzed and their toxicity was assessed by toxicity characteristic leaching procedure (TCLP), which was developed by USEPA. The TCLP method is a currently recognized international method for evaluation of heavy metal pollution in dustfall. The available levels of Cu, Zn, Pb, Cd...
This study dealed with the distribution and the origin of trace elements (Co, Cd, Mn, Ni, Zn, Tl and Pb) in two soil profiles from a site near a plant roasting pyrite for sulfuric acid production. Chemical partitioning of the trace elements showed that Tl and Pb in each individual extractable fraction(i.e. weak acid exchangeable, reducible and oxidizable)presented increasing trend upward through the...
This study investigated the effect of leachate DOM on the adsorption of Cu, Cd, Pb and Zn in the typical cinnamon soil in Northern China. The adsorption experiments were conducted under the conditions of isotherm at 15, 25 35°C and at various acidities (pH=5-9). The results revealed that the process of soil adsorb these metals is accord with the adsorption isotherm formula of S=KCN and S=SmC/(C+1/K)...
By using a hydrothermal treatment process, coal fly ash was transferred to a series of synthesized zeolites and characterized XRD and SEM observations. The synthesized zeolites exhibited more enhanced adsorption capacities for metals compared to the raw material as the increased CEC of the synthesized zeolites apparently provides a better adsorptive ability for metals. For the three synthesized zeolite...
Heavy metal accumulations in edible plants are commonly reported by scientist to alert the public on potential risks of toxicity effects. The study was conducted to determine the heavy metal accumulation in different part of the plant tissue namely Ipomoea reptans and Helianthus annuus. Spent batteries were utilized as the source of contamination with natural leaching process. Results indicated that...
Abstract- Column experiment simulations were carried out to determine potential metal ion migration in order to establish the environmental impact of a manganese mine wasteland and to understand the transport dynamics of heavy metal migration by way of two different soil types (tailings and tailings mud) within the Xiangtan Manganese Mine wasteland. Simulations were conducted at the Research Section...
Based on leaching experiment, the leaching of heavy metal in mine waste was brought out. The research showed that Zn, Cr, Pb and Cu concentrations are most in the leachate of weathered coal waste, and the concentration became stable rapidly; only Zn concentrations are found in fresh mine waste leachate in the beginning time. The soil around mine waste also was contaminated by heavy metal, such as...
New guidelines for using biosolids in UK agriculture favour the use of enhanced treated biosolids, such as dried and composted cakes, due to concerns about the potential for transfer of pathogens into the food chain. However, there is a need to ensure that their use is environmentally acceptable and does not increase the risk to potable water supplies or the food chain from other contaminants such...
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