Analysis of carbon emission hot spot and pumping energy efficiency in water supply system

• Main Authors: Huang, Guan-Lun, 黃冠綸
• Other Authors: Huang, Chih-Pin
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/73235431481401103231

碩士 === 國立交通大學 === 環境工程系所 === 101 === Evaluation of carbon emission hot spot for water treatment plant (WTP) is crucial to the reduction of carbon emission. For conventional WTP, the major carbon emission is energy used from pumping in water supply. Thus, pumping energy saving is very important in reducing carbon emission of WTP. The pumping efficiency and energy consumption are significantly affected by flow rate. It is difficult to operate the pump at the best efficiency point through properly adjusting the combination of pump meanwhile satisfy the requirement of potable water for user. This study aims to analyze the data of carbon emission in the operation of Bansin WTP following the PAS 2050 guideline for carbon footprint evaluation. The boundary of inventory and assessment includes the intake, the purification, and the distribution stages. In addition, pumping efficiency, power consumption per pump lift and specific energy consumption were used to estimate the potential of energy reduction in pumping for Bansin and Baoshan WTPs. The study results revealed that carbon footprint of Basin WTP is 0.39 kg CO2e/m3 in 2011. In addition, pumping energy used is carbon emission hot spot responsible for 65% total carbon emission. When WTP only contains the data of pump lift and power, the power consumption per pump lift can be used to evaluate the difference between rated power and operational power of pump and provide information for operator to replace or maintain the less efficiency pump. When WTP has the data of continuous values of pump lift, flow rate and power, the relationship between pumping efficiency (%) and specific energy consumption (kW/Q) can be used as an index to identify the optimum pump combinations which operate at the best efficiency point under different water supply.