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.
sewage sludge treatment:47
sewage sludge treatment
many larger sites utilize the biogas for combined heat and power, using the cooling water from the generators to maintain the temperature of the digestion plant at the required 35 ± 3 °c.