Energy Neutral Wastewater Treatment : Myth Or Reality?

5612 WordsSep 1, 201523 Pages
UNIVERSITY OF SOUTHAMPTON FACULTY OF ENGINEERING AND THE ENVIRONMENT Energy neutral wastewater treatment: myth or reality? by Lu Liang 26826453 A dissertation submitted in partial fulfillment of the degree of MSc in Civil Engineering Supervised by: Dr. Yongqiang Liu September 2015? SUMMARY Sewage treatment plants have been notorious for intensive energy consumption and large amount of chemical addition for decades. With the more stringent water discharge standards implemented for environment protection and the rapid urbanization with more than half of the world?s population living in urban areas, the energy consumption for sewage treatment is expected to be more than before. However, it has to be noted that there is great potential energy or resources embedded in wastewater in the forms of organic carbon, nitrogen or phosphorus, which is now realized as a ?misplaced resource? with 23W/capita total energy potential in domestic wastewater. With the further development of emerging technologies for energy reduction or energy recovery, could wastewater treatment plants be towards energy neutrality? How does energy neutral wastewater treatment contribute to the reduction of greenhouse gas emission? This project will thus review the novel and promising wastewater treatment technologies for energy reduction or energy recovery. Based on this, the relevant main factors technically influencing the application of these technologies will be evaluated. In addition, a
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