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- Title
Use of Biochar for Limiting the Pathway of Exposure and Reducing the Risk of Heavy Metal Contamination from Mines.
- Authors
Mafiana, Macdonald Ogorm; Dodkins, Ian Robert; Dirisu, Chimezie Gabriel; Li, Shi-Weng
- Abstract
Field-scale experiments were conducted to assess biochar's ability with and without supplements to sequester heavy metals of lead (Pb2+) and zinc (Zn2+) from stream water contaminated by abandoned mines. The study was conducted at the Frongoch mine watercourse site in central Wales for 1104 h (46 days). The methods employed include pyrolysis of waste Leylandii feedstocks at 700 °C and post-amendment ash at ratios in mass (kg/kg) 1:10, 1:35, 1:50, and 1:100 of biophos to biochar (BC) and 1:1:100 mixed biophos and cockleshell ash to biochar (CBB). The collected data were analyzed by ASTM Brunauer-Emmett-Teller (BET), XRF spectrometer, R-stat, and SPSS statistical procedures. The results showed that non-amended samples are better suitable as adsorbent materials of lead and zinc. Overall, this field study showed that 33 g/kg of lead and 30 g/kg of zinc could be sequestered by 50 g of biochar (BC) and activated carbon (AC) from the contaminated mine watercourse containing 0.62 mg/L and 15.8 mg/L of lead and zinc metals flowing at 0.014 m3/s. These adsorbent materials BC and AC applications are variably recommended at an optimal replacement interval of 1104 h (46 days) and 72 h (3 days) for lead and zinc sorption, respectively.
- Subjects
WALES; HEAVY metals; BIOCHAR; ACTIVATED carbon; ABANDONED mines; RISK exposure; HEAVY metal content of water
- Publication
Water, Air & Soil Pollution, 2021, Vol 232, Issue 3, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-021-05004-7