The waste sludge is pumped to what was formerly the lagoon system. It has been modified to accomplish sludge treatment, however, instead of wastewater treatment. The waste sludge goes first into the aerated lagoon, which has both diffused aeration plus continuous recirculation pumping. The solids are, thus, kept in suspension and are provided with oxygen. In this aerobic environment, the solids decompose, or stabilize, without causing odor problems.
After receiving treatment in the aerated lagoon, waste sludge flows into the large lagoon cell for storage. There is no discharge from the large cell, so excess water is removed only by evaporation.