METROGRO™ Cake is anaerobically digested solid material that comes from solids removed during the wastewater treatment process. Before wastewater arrives at the Metro District, it has been protected by a pretreatment program designed to minimize harmful or toxic chemicals entering the wastewater stream. Anaerobic digestion is a treatment method the Metro District uses to further break down the wastewater solids and destroy pathogens. The digested solids are then processed through centrifuges to remove water, leaving a mixture that is fairly homogeneous and has the consistency of thick cake batter. It consistently exceeds the criteria established in both the EPA and Colorado Biosolids Regulations for application to farm fields as a soil amendment and fertilizer. Although METROGRO™ Cake is used primarily in agriculture on farmland, it can also be beneficially used on rangeland, in forests, and in land reclamation projects.

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