Coal Ash Pond Polishing Filter System, USA
Country
USA
Application
Power Plants
Water source
Wastewater
Filtration solution
12 x 12” EBS 10K (25 micron)
Background
The power plant’s wastewater is contaminated by coal ash generated from power plant operations and removed in the scrubber system. The wastewater is sent to a settling pond after polymer injection to allow for sedimentation. The wastewater then travels to a second, third and fourth pond for additional settling. The water is pumped at a maximum flow rate of 10,000 GPM.
Challenge
Plant land restrictions required the elimination of the last settling pond. This initiated the search for a treatment/polishing system to maintain a TSS of less than 25 PPM to meet discharge requirements.
Solution
After running a pilot with both screen and disc filter systems at various micron ratings, it was determined that the most effective solution was a 25 micron screen system. 12 x 12” EBS 10000 with 25 micron weave – wire screens were supplied. Due to redundancy and future expansion, the customer preferred to install the system in 4 rows of 3 units each.
Results
TSS at the discharge point is low most of the time. During storm events, the TSS rises and the filters flush more frequently. The filter system consistently keeps the effluent TSS at the level of 5 to 10 PPM with rare spikes to 18 PPM.
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