Analysis of Typical Energy Saving Technology in the Sewage Treatment Plant

There are a large amount of low-grade waste thermal energy in the sewage and abundant organic substances in the sludge. By making full use of the energy in these resources, which can complement or offset the energy consumed in the sewage treatment process, the sewage treatment plants can significantly reduce the amount of carbon dioxide indirect emissions. The goal of "carbon neutrality" in the sewage treatment plant can be achieved. The sewage source heat pump using sewage thermal energy can supply cooling and heating in the buildings; The sludge anaerobic digestion process can produce a lot of biogas for generating electricity; The photovoltaic power generation modules can compensate the heat and the electric consumption of the sewage treatment plant. Comparing and analyzing the differences of three technologies in aspects of energy saving, economic feasibility and carbon neutral, the research result shows that the best treatment method is the SSHP technology, which have energy saving potential by using lowgrade waste thermal energy and is contributed to achieve "carbon neutrality" of the sewage treatment plant. (C) 2017 The Authors. Published by Elsevier Ltd.