Study on the energy consumption and conservation trend of sewage treatment processes

The sewage treatment industry intensively consumes energy, which results in high operating costs and aggravates the energy crisis in China to a certain extent. Therefore, the study of the energy consumption and conservation of sewage treatment processes is of high realistic significance. Domestic and overseas sewage treatment processes, their current status of energy consumption and energy audit, as well as the trend of sewage treatment processes and their energy conservation are explored to obtain theoretical enlightenment on the energy conservation, emission reduction, and sewage treatment recycling in China. The results show that the activated sludge process is mainly used in Chinese sewage treatment plants. The average energy consumption of all sewage treatments is 0.30 kWh/m3 in China. CASS achieved the lowest amount of average energy consumption at 0.24 kWh/m3. SBR obtained the largest energy consumption of 0.36 kWh/m3. The energy consumption is 0.06 kWh/m3 for sewage lifting, 0.178 kWh/m3 for sewage treatment, and 0.028 kWh/m3 for sludge treatment in China. (2014) Trans Tech Publications, Switzerland