Treatment And Fast Removal of Zinc And Lead From Mine Water By Wood Ash Amended Biochar
Mines are a major source of contamination for aquatic environments. Lead and zinc mines are a primary source of environmental transition metal contamination resulting in major water contamination globally. In this study the use of biochar amended with wood ash (WAS) was evaluated as a treatment to remediate zinc and lead contaminated mine water. Mine impacted water from Nantymwyn abandoned lead mine, with zinc concentrations as high as 12.1 mg/L and lead concentrations as high as 1.7 mg/L was used. The contact time required for WAS to immobilise zinc and lead, immobilisation mechanisms and maximum measured removal of lead and zinc by WAS were studied. The fast removal performance of a biochar is a key indicator of its viability to be used as a green remediator. If the required contact time between sorbent and sorbate to remediate a contaminated water is too long the use of that sorbent becomes impractical. This is particularly true in continuous flow systems where contact time between biochar and contaminant is limited such as in streams and rivers contaminated by mine water. This study demonstrated that WAS removed 97% of zinc and 86% of lead within the first minute of contact time with the mine water, with a maximum measured removal of 14.8 mg/g for zinc and 23.7 mg/g for lead. The fast removal performance was primarily as a result of precipitation and ion exchange both key to early stage immobilisation
Year of publication: |
[2022]
|
---|---|
Authors: | Cairns, Stuart ; Todd, Aaron ; Robertson, Iain ; Byrne, Patrick |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
Saved in favorites
Similar items by person
-
Changes in Acid Herbicide Concentrations in Urban Streams after a Cosmetic Pesticides Ban
Todd, Aaron, (2014)
-
Calculating marginal effects in dichotomous - continuous models
Saha, Atanu, (1997)
-
Saha, Atanu, (1997)
- More ...