Skimoil has just introduced after field trials, their latest Floating Weir Skimmer (FWS) Coal Ash Pond* Surface Decanter designed for high flow rate decanting of surface water from coal ash ponds, without disturbing the underlying well settled ash. The surface water decanting is usually the first step in coal ash pond management and closure.
Under typical operations this decanted water is monitored for TSS and pH and discharged to public waterways until the water level reaches the interstitial level of 3' above the ash, at which point the dewatering process begins and remaining water has to be sent to a waste-water treatment plant for treatment prior to release, according to the new rules from the Environmental Protection Agency.
After all de-watering is done the ash can then be excavated, transported or isolated in lined disposal ponds or in some cases abandoned/closed underground mines, according to the facility owners permitting.
*Coal ash is the toxic-laden waste by product left behind after coal is burned for energy. Generally, the ash is collected and then transported to large coal sludge “ponds.