What is it about?
First, manganese removal requires high pH generally, so some facilities require lowering pH again (<8.6~9.0) after Mn treatment, but it depends on the inflow water quality. We suggest suitable pH to treat Mn after examination of several facilities worldwide (Input: Mn, Fe, Al, Outpuit: pH). We considered coprecipitation/sorption to predict pH. Second, SSVR (ratio of the generation rate of sludge to the required settling volume) was introduced to help deciding between semi-active and active treatment systems.
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Why is it important?
Manganese removal at lower pH and sludge volume in settling ponds are some of the major issues affecting chemical treatment systems for mine drainage. When we design Mn treatment facilities, we should determine whether we should lower pH again to meet environmental criteria. We suggested a prediction equation of pH to treat manganese, because the pH to treat Mn varies according to coprecipitation and sorption.
Perspectives
I often needed to predict whether pH should be readjusted after treating Mn, because pH oftern should be increased >8.6 to treat Mn. By analyses of several facilities and pilot-scale tests, I could decide whether to install pH readjustment system after Mn treatment.
Duk-Min Kim
Korea Mine Reclamation Corporation
Read the Original
This page is a summary of: Manganese coprecipitation/adsorption behaviour and sludge volume ratios in chemical treatment systems for mine drainage: a review of the literature and a pilot-scale experiment, Water and Environment Journal, October 2017, Wiley,
DOI: 10.1111/wej.12312.
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