Eliminating leakage and better using biosolids
PROBLEM
The client, a creamery, needed to remove excess biosolids that had accumulated when a clay-lined winter storage pond was previously equipped with a surface aerator. The accumulated solids were limiting storage and interfering with performance of the odor control system.
SOLUTION
After considering reduction of volume via treatment in place, liquid land application, and dry solid land application, we developed a preliminary sludge management plan for liquid application that addressed waste characterization, field determination, crop suitability, loading rates, dewatering activities and prescribed final haul out. The storage pond was dredged, and a seepage test was completed using specialized instrumentation for monitoring water levels and weather parameters. We then prepared drawings and specifications to reconstruct the existing pond liner with a 60-mil liner. Contaminated subgrade soils were placed in the staging area for eventual land application.
RESULTS
Using biosolids as a soil amendment vastly reduced the amount of commercial fertilizer needed for crops and avoided placing them in a landfill, further saving time, energy and money. The new liner also eliminated wastewater leakage, protecting the environment.