STUDY ON STANDARDS ON CARBON EMISSION IN MUNICIPAL WATER SUPPLY AND DRAINAGE SYSTEMS

Under the direction of carbon peaking and carbon neutralization goal, the municipal water supply and drainage system, as an important component of the urban and rural construction field, needs to transform towards green and low-carbon. In this paper, new requirements concerning municipal water supply and drainage systems in China and industry, and the draft of carbon emission standards in urban and rural construction field were analysed. Accounting boundary and scope of carbon emissions from municipal water supply and drainage system were also determined. Some problems were discovered through analysis of the three group standards about carbon emissions. For example, only carbon emissions of sewage and sludge treatment stages were considered, and carbon emission factors were not uniformed among the three group standards, etc. Therefore, a carbon emission standard for municipal water supply and drainage systems was suggested to be established at the national or industry level. The new standard needs to cover planning and construction, operation and maintenance, and demolition stages, and cover water supply system, sewage treatment system, reclaimed water system, and storm-water system. In addition, carbon emission reduction routes, including giving high priority to saving water, strengthening the leakage and damage control in urban water supply networks, studying the influence of septic tanks on carbon emission of sewage systems, improving the collection rate of sewage networks, and developing low-energy nitrogen removal technology were suggested. This study can provide a reference to the green and low-carbon development of municipal water supply and drainage systems in China.