However, you do need to ensure you are pumping the septic tank regularly ... bacteria and microorganisms inside the tank use a process known as anaerobic digestion to help decompose the solid ...

the project entails trucking sludge from wastewater facilities in Kihei and Lahaina to the Kahului facility to be dried using methane gas byproducts of the plant’s anaerobic digestion project.

The Altoona Water Auth­ority has agreed to pay $825,000 for an investment-grade audit that could lead to an approximately $29 million anaerobic digester project at the Westerly Sewer Treat­ment ...