CHEMICAL CONDITIONING AND EQUIPMENT

Prior to the onset of the project, a dewatering trial performed by a WaterSolve technician determined Solve 137 was the best polymer for water release, clarity, and flocculation for this residual. The village manager determined a driveway between a lagoon and a building would be the best place to position a Geotextile Tube. There was adequate electricity and water to supply the WaterSolve Model 1000-V2 polymer make-down unit to be used in the project. The clean filtrate water could gravity flow to the lagoon without needing a pump.

GEOTEXTILE TUBE CONTAINER SIZING

Ten years prior to this clean out the village reported to have removed 28,000 gallons of the sludge. WaterSolve estimated 28,000 gallons of this residual would fit in a 30 ft. circumference by 50 ft. long tube. This tube would fit ideally on a driveway between the lagoon and the building.

THE RESULT

There were 4 truckloads containing 5,300 gallons unloaded into the Geotextile tube on the morning of the clean out for a total of 21,200 gallons. The iron sludge was thicker than expected. The sample used for the estimating indicated 2% dry wt. solids and a sample taken from the trucks was 3.9%. One truckload containing 6,500 gallons was stored for a week and then pumped into the tube when the tube had shrunk enough to hold it. This brought the total to 27,700 gallons. 2 months after the pour, we measured 26 cubic yards in the tube and it tested 17.5% dry wt. solids. The dewatering process had reduced the volume by  approximately 80%. The sludge passed paint filter and was hauled to a landfill successfully. One barrel of the Solve 137 polymer was needed to flocculate the iron sludge slurry as it was pumped into the geotextile tube.