Process improvement and energy saving measures for sewage treatment plant

Abstract

Energy in sewage treatment plant (STP) show the differential energy consumption on various stages which it depends on the indicator of the findings. To do comparison and benchmarking, the suitable key energy consumption indicator need to identify, and the suitable method need to formulate in performing the energy. This study is to perform energy saving measures (ESM) and process improvement for the STP. The study started with planning to select the STP and study on the potential of method to use. Sites visit then conducted to make an overall overview of STP and the related data was collected to do analysis. The propose ESM and process improvement analyzed in term of results feasibility, findings, and economic analysis. Introducing the Solar PV systems by do comparison type of panel and area available will determine the potential of savings. Retrofitting the lighting for existing 36W fluorescent to LED T8 14W and for 300W spotlight to 150W LED spotlight also help the STP to reduce the energy consumption. Retrofitting the Sequencing Batch Reactor (SBR) to produce biogas and the development of Combine Heat and Power (CHP) plant to generate electricity will reduce the demand of electricity from the grid. The waste heat produced later can be used for sludge dewatering process. Sludge utilization will help the STP to generate yearly income rather than allocate budget for the sludge removal from the STP. The overall result which is categorized according to the options will the analyzed to perform the best selected option. The best option is to utilize all the available potential area of Solar PV installation along with another ESM and utilization to obtain the best result. The combination of proposed improvement being analyzed according to the selected option, economic feasibility, energy savings, CO2 reduction and simple payback period with expected reducing the energy consumption and cost at the STP. As conclusion, the implementation of all the propose ESM and utilization will lead the savings in many aspects of area to the STP.