Anaerobic Treatment of Mine Wastewater for the Removal of Selenate and its Co-Contaminants

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Synopsis

Selenium (Se) pollution has led to several cases of severe aquatic ecosystem deterioration due to Se poisoning caused by bioaccumulation over time. However, the removal of selenate (SeO42-) from wastewater streams with co-contaminants has been largely considered as a black box in anaerobic biological systems using mixed consortia. This research aimed at addressing the effect of wastewater characteristics, i.e. co-contaminants such as nitrate (NO3-) and sulfate (SO42-), heavy metals and pH, on the biological reduction of SeO42- and evaluating process integration for Se-laden wastewater treatment with co-contaminants. This study demonstrated that the presence of co-contaminants can actually be beneficial for Se removal provided that the concentrations are carefully monitored and appropriate operating conditions and process configurations are used. The Se removal (total Se and SeO42-) efficiency increased by ~30% in the presence of NO3- and/or SO42- compared to systems with SeO42- alone. Additionally, an integrated process of an ion exchange (IX) column and bioreactors showed improved overall removal capacity for SO42- and total Se. The knowledge and information gained from this research can help in the advancement and application of biological processes, i.e. predicting of reactor performance, solving specific design or practical problems and implementing novel treatment techniques for Se-laden mine wastewater.

Book details

Series:: IHE Delft PhD Thesis Series
Author:: Lea Chua Tan
ISBN:: 9780429828409
Related ISBNs:: 9781138328419, 9780429448676
Publisher:: CRC Press
Pages:: 20
Reading age:: Not specified
Includes images:: Yes
Date of addition:: 2023-09-10
Usage restrictions:: Copyright
Copyright by:: Lea Chua Tan
Adult content:: No
Language:: English
Categories:: Nonfiction, Science, Technology