scholarly journals Leaching of hexavalent chromium from young chromite ore processing residue

2020 ◽  
Vol 49 (3) ◽  
pp. 712-722
Author(s):  
Katrin Matern ◽  
Harald Weigand ◽  
Ruben Kretzschmar ◽  
Tim Mansfeldt
Keyword(s):  
Hexavalent Chromium ◽  
Chromite Ore Processing Residue ◽  
Chromite Ore ◽  
Ore Processing

Preventing surface deposition of chromium with asphalt caps at chromite ore processing residue sites: a case study

2007 ◽  
Vol 44 (7) ◽  
pp. 814-839 ◽  
Author(s):  
Karen S Henry ◽  
John C Petura ◽  
Steven Brooks ◽  
Steven Dentico ◽  
Stephen A Kessel ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Capillary Rise ◽  
Matric Suction ◽  
Upward Movement ◽  
Chromite Ore Processing Residue ◽  
Chromite Ore ◽  
Ore Processing ◽  
Unsaturated Hydraulic Conductivity ◽  
Water Rise

Caps were constructed on chromite ore processing residue (COPR) sites in the Kearny, New Jersey, area between 1989 and 1994 to prevent human exposure to hexavalent chromium (Cr(VI)). The caps comprise geotextile overlain by 100 mm of dense graded aggregate (DGA) and 100 mm of hot mix asphalt (HMA). Prior to constructing these "composite asphalt caps" (CACs), Cr(VI) was sometimes deposited on surface soils as chromate (salts) during evaporative periods. We initially thought the geotextile and DGA acted as a capillary barrier, stopping capillary water rise, but site inspection revealed that the DGA and geotextile were too moist to perform this function. Further study included a literature review, DGA capillary rise estimates, in situ measurement of soil-water content over 7 months at a representative COPR site, and numerical modeling of matric suction gradients induced by evaporation. The collective results reveal that the CACs eliminate upward matric suction gradients from the COPR–soil through the DGA, thereby precluding surface chromate deposition. Even during evaporative periods, the low unsaturated hydraulic conductivity of the HMA restricts upward movement of moisture and soluble chromate from underlying COPR–soil. In contrast, there are almost always upward matric suction gradients in uncapped COPR–soil.Key words: capillary rise, chromite ore processing residue, chromate, hexavalent chromium, composite asphalt cap, evaporation.

Calcium polysulfide remediation of hexavalent chromium contamination from chromite ore processing residue

2006 ◽  
Vol 364 (1-3) ◽  
pp. 32-44 ◽  
Author(s):  
Margaret C. Graham ◽  
John G. Farmer ◽  
Peter Anderson ◽  
Edward Paterson ◽  
Stephen Hillier ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Chromite Ore Processing Residue ◽  
Chromite Ore ◽  
Chromium Contamination ◽  
Ore Processing ◽  
Calcium Polysulfide

Assessment of calcium polysulfide for the remediation of hexavalent chromium in chromite ore processing residue (COPR)

2007 ◽  
Vol 143 (3) ◽  
pp. 620-628 ◽  
Author(s):  
M WAZNE ◽  
S JAGUPILLA ◽  
D MOON ◽  
S JAGUPILLA ◽  
C CHRISTODOULATOS ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Chromite Ore Processing Residue ◽  
Chromite Ore ◽  
Ore Processing ◽  
Calcium Polysulfide

scholarly journals Hazardous Waste Disposal in Stromatolitic-Limestone Terrain and Hexavalent Chromium Contamination in Chhattisgarh State, India

2020 ◽  
Vol 10 (27) ◽  
pp. 200907
Author(s):  
Alka Banchhor ◽  
Madhurima Pandey ◽  
Meena Chakraborty ◽  
Piyush Kant Pandey
Keyword(s):  
Environmental Health ◽  
Hazardous Waste ◽  
Hexavalent Chromium ◽  
Water Discharge ◽  
Contaminated Water ◽  
Chromite Ore Processing Residue ◽  
Chromite Ore ◽  
Chromium Contamination ◽  
Ore Processing ◽  
Hazardous Waste Landfills

Background. Hexavalent chromium-containing waste from chromite ore processing is a major environmental health hazard due to its high toxicity. There have been instances of improper and unsafe disposal of this waste, leading to environmental health hazards. Objectives. The objective of the present study was to identify the cause of yellow colored water discharge and reported health issues in nearby residents and cattle. In addition, it investigated the improper disposal of chromite ore processing residue (COPR), a hazardous waste, in an abandoned quarry in stromatolitic-limestone terrain in central-east India. Methods. Standard methods of analysis of water and wastewater were used for the analyses of variables, including hexavalent chromium (Cr(VI)), pH, sulfate (SO42−), chlorine (Cl−), total hardness, calcium (Ca(II)), magnesium (Mg(II)), alkalinity and sodium (Na(I)) with proper sampling, quality assurance, and quality control protocols. Onsite Cr(VI) was analyzed using a chromium testing kit, and in the laboratory by atomic absorption spectrophotometry. Results. Large-scale contamination of surface and groundwater was noted due to the migration of hexavalent chromium-contaminated yellow colored leachate. High levels of hexavalent chromium were noted in the samples. The maximum Cr(VI) concentration observed was 1050 mg/L in leachate, 22 mg/L in surface water and 0.26 mg/L in the groundwater sample. Acute health effects were noted in cattle and by residents who consumed the highly contaminated water. Conclusions. A large volume of discharge of hexavalent chromium contamination from the COPR landfill was found, indicating the absence of containment features in the design (double high-density polyethylene liners, clay, leachate collection). Disposal of COPR in an abandoned limestone mine is inadvisable. The highly fractured stromatolitic-limestone environment at the study site was found to offer almost no resistance to the mobilization of Cr(VI) due to the absence of organic or eukaryotic deposition in the stromatolitic environment. It was also noted that the drainage pattern of the area facilitates a possible translocation of contaminated discharge to the nearby river system. Nearby residents were unaware of the adverse impacts of the contaminated leachates and were using the contaminated water for bathing, washing, etc. Applicable Indian governmental regulations regarding the construction of hazardous waste landfills were found to be insufficient with respect to the use of inactive limestone mines as landfill sites. Competing Interests. The authors declare no competing financial interests.

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