Anaerobic batch leaching test of shale rock grains
Anaerobic batch leaching test of shale rock grains
Normal batch leaching tests regulated by JLT46 and modified batch leaching tests evaluated the arsenic (As) leaching behaviour of shale rock grains. The modified batch leaching tests were carried out using de-aired distilled water and eliminating headspace to simulate anaerobic conditions. The results show that dissolved oxygen (DO) in normal batch leaching tests is ~6.0 mg/L. DO can be reduced to ~2.0 mg/L because of using de-aired water and eliminating the headspace and shaking step. The results suggest that pseudo anaerobic condition can be achieved by eliminating the headspace and shaking step and conducting the tests in the vacuum deaerator since the DO was very low (~1.1 mg/L). Under the pseudo anaerobic conditions, the arsenic leaching concentrations are lowest (~0.001 mg/L), which implies that As leaching might be suppressed under anaerobic conditions. Furthermore, these concentrations are below the regulatory standard (As < 0.01 mg/L), which suggests that the shale rock grains are environmentally safe for utilisation in geotechnical applications.
Lincoln W Gathuka; Yusuke Masaki; Tomohiro Kato; Atsushi Takai; Takeshi Katsumi
3rd International Symposium on Coupled Phenomena in Environmental Geotechnics (CPEG2020)
Remediation and contaminant characterization
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