department events

Biosolids Treatment & Management

Biosolids Treatment and Management


Biosolids Treatmentinside WWTF

Settled solids from the clarification process, which are approximately .5% total solids by weight, are mechanically thickened to approximately 5% total solids by weight. From the thickening process, these solids are moved to a high heat aerobic digester. This process, known as autothermal thermophilic aerobic digestion, minimizes pathogens and produces an inert beneficial reuse product. It is classified as Class A exceptional quality Biosolids by Minnesota Pollution Control Agency rule.


Biosolids Management

The Biosolids produced by the Glacial Lakes Sanitary Sewer & Water District (GLSSWD) is a nutrient rich organic product. It is a renewable resource that can be recycled as a fertilizer and soil amendment. Currently all GLSSWD Biosolids produced is land applied to agricultural fields. The GLSSWD works closely with farmers regarding the application of Biosolids in relationship to crop nutrient needs as recommended by the University of Minnesota. The Minnesota Pollution Control Agency (MPCA) regulates all aspects of Biosolids management with yearly reporting required.

 Bio Storage

The GLSSWD is certified by the MPCA to manage its Biosolids operation.


Biosolids has proven to be a valuable resource. When managed correctly, there is assurance of public health and water quality protection.