Characteristics of heavy metal release from incinerated ash, melted slag and their re-products

1997 ◽  
Vol 36 (11) ◽  
pp. 267-274 ◽  
Author(s):  
Masa-aki Ozaki ◽  
Haruki Watanabe ◽  
Bernd Wiebusch
Keyword(s):  
Heavy Metal ◽  
Ph Value ◽  
Test Method ◽  
Leaching Tests ◽  
Leaching Test ◽  
Metal Release ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations ◽  
Heavy Metal Release ◽  
Ash Leaching

Several leaching tests were conducted for sewage sludge and their re-products to investigate the characteristics of heavy metal release. Regarding incinerated ash, leaching tests indicated that the concentrations of Se and As in leachate were relatively higher than those of other heavy metals. The ratio of As extracted into leachate varied according to the leaching test method. The lower the pH value of leachate after the leaching test, the higher the concentration of As observed. The data using the Holland method had the highest value, and 19.7–46.9% of As was extracted into leachate. If the ratio of concentration in leachate to content (L/C) by the Holland method is 1.00, that of other methods was 0.20–0.43. Regarding melted slag, leaching tests indicated that the heavy metal concentrations in leachate were very low. Regarding re-products, leaching tests indicated that the heavy metal concentrations in leachate were much lower than those of incinerated ash and melted slag. The diameter effect of crushed sample was investigated by the Holland method. 0.3–0.7% of As was extracted from the crushed samples having diameter 20–50 mm and 0.9–2.6% of As was extracted from the samples having diameter less than 5 mm.

Analysis of Influence Factors on Heavy Metal Release from Mine Waste Rock in Fu Xin Mine Area

2010 ◽  
Vol 29-32 ◽  
pp. 2570-2575
Author(s):  
Bing Liang ◽  
Li Guo Jiang ◽  
Xiu Sheng Lu
Keyword(s):  
Heavy Metal ◽  
Ph Value ◽  
Mine Waste ◽  
Influence Factors ◽  
Waste Rock ◽  
Metal Release ◽  
Mine Waste Rock ◽  
Leaching Solution ◽  
Heavy Metal Elements ◽  
Heavy Metal Release

For analysis of influence factors on heavy metal release from different weathering mine waste rock in Fu Xin mine area under the effect of rain water leaching, the materials which come from mine waste rock pile nearby Xin Qiu mine is collected and then process a serial leaching experiments. The initial PH value of leaching solution and experiment temperature have been selected to as influencing factors according to rainfall and weather condition of Fuxin mining area. The concentration of five heavy metal elements: Cd, Cr, Cu, Mn and Pb are tested in leaching solutions. The results show that the constituent characteristics of stratum rock is a major factor influenced on leaching solutions and heavy metal release. The weakly acidic leaching solution becomes to weakly alkaline after leaching the waste rock. The quantities of different heavy metal release represent disparate rules, influenced by distinct weathering degree. Concentrations of Cd and Cr increase with the leaching solution's pH value variation while Cu, Mn and Pb decreased. Higher temperature leads more heavy metal elements release from the waste rock.

scholarly journals Effect of overlying water pH, dissolved oxygen and temperature on heavy metal release from river sediments under laboratory conditions

2017 ◽  
Vol 43 (2) ◽  
pp. 28-36 ◽  
Author(s):  
Yuanxing Huang ◽  
Daofang Zhang ◽  
Zhihua Xu ◽  
Shijue Yuan ◽  
Yuanheng Li ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Dissolved Oxygen ◽  
River Sediments ◽  
Residual Fraction ◽  
Statistical Interpretation ◽  
Metal Release ◽  
Overlying Water ◽  
Metal Concentrations ◽  
Water Ph ◽  
Heavy Metal Release

Abstract The heavy metal release experiments were conducted in the laboratory to examine the effects of 3 factors - pH, dissolved oxygen (DO), and temperature on the metal release from sediments taken from the Huangpu River. The metal concentrations in the dry sediments ranged from 0.030 to 0.296 mg g-1 for Cr, 0.021 to 0.097 mg g-1 for Ni, 0.014 to 0.219 mg g-1 for Cu, 0.035 mg to 0.521 mg g-1 for Zn, 0.0002 to 0.001 mg g-1 for Cd and 0.023 to 0.089 mg g-1 for Pb. Most of the metals found in the sediments were in the form of residual fraction, the exchangeable fraction consisted of only a small portion of total metals. The average dissolved metal concentrations in the overlying water during the 13-day period under different conditions were ranging from 0.82 to 1.93 μg L-1 for Cr, 1.08 to 4.19 μg L-1 for Ni, 40.79 to 82.28 μg L-1 for Cu, 20.30 to 29.96 μg L-1 for Zn, 1.57 to 4.07 μg L-1 for Cd, and 22.26 to 75.50 μg L-1 for Pb, respectively. Statistical interpretation of the data indicated that pH (7, 8, 9), dissolved oxygen DO (1.0 and 5.0 mg L-1) and temperature (4, 16, 25°C) had no significant effects on the heavy metal release under the studied conditions. Cu and Pb had the highest release flux, while Cd, Pb and Cu had higher mobility. The main factors controlling the metals release might be the inherent characters of metals and sediments.

scholarly journals pH Effect on Heavy Metal Release from a Polluted Sediment

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Yanhao Zhang ◽  
Haohan Zhang ◽  
Zhibin Zhang ◽  
Chengying Liu ◽  
Cuizhen Sun ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Sequential Extraction ◽  
River Water ◽  
Ph Effect ◽  
Residual Fraction ◽  
Leaching Test ◽  
Metal Release ◽  
Polluted Sediment ◽  
Leaching Solution ◽  
Heavy Metal Release

The performance of Cd, Ni, and Cu release from river sediment at different pH was investigated by a leaching test using deionised water and river water as leachants. Visual MINTEQ geochemical software was used to model the experimental results to predict heavy metal release from sediments. The distribution and speciation of heavy metals in the sediments after leaching test were analyzed by Tessier sequential extraction. Leaching test results showed that the release amounts of Cd, Ni, and Cu are in the range of 10.2–27.3 mg·kg−1, 80.5–140.1 mg·kg−1, and 6.1–30.8 mg·kg−1, respectively, with deionised water as leachant at different pH. As far as the river water was used as the leaching solution in the test, the results show similar metal leaching contents and tendencies to that of the deionised water as leaching solution. The results of Tessier sequential extraction indicate that Cd of residual fraction easily forms obvious precipitate under the acidic condition, especially in the range of pH 0–4 with the residual of Cd over 50% of the total Cd in the sediment. The exchangeable content of Ni decreases with the increase of pH under the range of 0–5. The Fe-Mn oxide fraction of Cu in the sediments changes significantly from pH 0 to pH 9. Based on the effect of pH on the leaching of Cd, Ni, and Cu from the polluted sediment in the tests, more accurate information could be obtained to assess the risk related to metal release from sediments once it is exposed to the changed acid/alkali water conditions.

Heavy metal concentrations in roadside soils of Lithuania's highways

Geologija ◽  
2008 ◽  
Vol 50 (4) ◽  
pp. 237-245 ◽  
Author(s):  
Audronė Jankaitė ◽  
Pranas Baltrėnas ◽  
Agnė Kazlauskienė
Keyword(s):  
Heavy Metal ◽  
Roadside Soils ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations

scholarly journals Lead smelting alters wheat flour heavy metal concentrations and health risks

2021 ◽  
Author(s):  
Liping Li ◽  
Yuqing Zhang ◽  
James A. Ippolito ◽  
Weiqin Xing ◽  
Chen Tu
Keyword(s):  
Heavy Metal ◽  
Wheat Flour ◽  
Health Risks ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations ◽  
Lead Smelting

scholarly journals Modeling heavy metal release in the epiphytic lichen Evernia prunastri

2021 ◽  
Author(s):  
Andrea Vannini ◽  
Luca Paoli ◽  
Riccardo Fedeli ◽  
Sharon Kwambai Kangogo ◽  
Massimo Guarnieri ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Remote Area ◽  
Metal Release ◽  
Evernia Prunastri ◽  
Epiphytic Lichen ◽  
Pollution Levels ◽  
Short Period ◽  
High Pollution ◽  
Heavy Metal Release ◽  
Very High

AbstractIn this study, the release of Cu2+ and Zn2+ was investigated and modeled in the epiphytic lichen Evernia prunastri. Samples were incubated with solutions containing these metals at ecologically relevant concentrations (10 and 100 μM) and then transplanted to a remote area and retrieved after 1, 2, 3, 6, 12, and 18 months. The results showed that, after 12 months, all samples faced similar metal reductions of ca. 80–85%, but after this period, all the involved processes seem to be no longer capable of generating further reductions. These results suggest that the lichen E. prunastri can provide information about environmental improvements after exposure to high or very high pollution levels in a relatively short period of time.

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