Active treatment of
coal water slurry waste utilizes aeration, neutralization (including chemical
precipitation), metal removal, chemical precipitation, membrane process, ion
exchange and biological sulfate removal (INAP, 2013).
Aeration allows coal
sludge to absorb oxygen to remove iron. Neutralization treats the sludge with
sodium, calcium hydroxide and lime to form metal hydroxides. Membrane process
filters metal from the sludge.
The focus of this
technology is to prevent groundwater pollution from coal sludge treatment.
Delivering the treated sludge to a holding pond to percolate through a wetland
doesn’t sound like a good idea if you want to protect groundwater. Power
companies need to develop better final treatment methods to neutralize or use
its metal hydroxides.
Norb Leahy, Dunwoody GA
Tea Party Leader
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