Instead of waiting for tougher nitrogen permit limits, operators in Asheboro, N.C., proactively advanced the nutrient removal capacity of existing plant and equipment.

A North Carolina plant team’s innovations include simultaneous nitrification-denitrification to meet upcoming phosphorus and nitrogen removal mandates.

Two advanced treatment plants in Florida make process and facility changes that save hundreds of thousands on electricity and chemicals.

A poplar tree farm allows an Oregon utility to diversify its beneficial use options for Class B biosolids and significantly extends the land application season.

Steady improvements keep a small secondary plant in Texas compliant with regulations and in peak operating condition despite budget limitations.