Locking of water balance of SDW polygons by means of filtrate recycling

Abstract

To prevent underflooding of SDW polygons with geomembranes in the foundation, a design procedure of admissible water ingress into the exploited polygon has been developed. The admissible annual settled sludges is within 12 – 50 mm. To remove surcharge water, it is offered to take away snow from the polygon in the winter time and to raise the filtrate evaporation during its recycling in the summer season. The mathematical model is developed and design dependences for drop evaporation rate are obtained. The sufficient filtrate evaporation degree is reached in its spraying with drop diameter of 0.12 mm from height of 5 m. Recycling allows reducing the filtrate contamination as well. It is denoted the necessity of the upper waterproofing of the polygon after its filling. The developed procedures will be beneficial in designing SDW polygons.