Green house gasses estimation from clean water production and supply sector in Depok City, Indonesia

The water sector is one of the significant sources of CO2 emissions to the atmosphere. However, there are still limited studies in evaluating the emissions from the clean water production and supply sector. This study aimed to calculate CO2 emissions from the sector which includes raw water abstraction, clean water treatment plant, and clean water distribution by using mathematical models. The calculation was carried out to two water treatment plants in Depok City, Legong and Citayam. CO2 emissions from both WTP are estimated at 0.49 kg CO2/m3 for WTP Legong and 0.35 kg CO2/m3 for WTP Citayam. Based on the calculation, electricity consumption is the most contributing component to CO2 emissions because the operation of both WTP requires an extensive amount of electricity. This study also revealed that changing the source of electrical power gave the largest reduction in CO2 emissions.