we found 68 stations located  at wastewater treatment plants, where the process of waste digestion  causes temperatures to be higher than in surrounding areas.
we found 68 stations located  at wastewater treatment plants, where the process of waste digestion  causes temperatures to be higher than in surrounding areas.
anaerobic digestion:291
today, anaerobic digesters are commonly found alongside farms to reduce nitrogen run-off from manure, or wastewater treatment facilities to reduce the costs of sludge disposal.