Guiyang Radio and Television Station | Guiyang Distributed Sunken Reclaimed Water System was selected as a "carbon peak, carbon neutralization" case in the realm of urban and rural construction of the Ministry of Housing and Urban-Rural Development

The reporter learned from the Guizhou business area of the China Water Environment Group that the Collection of Typical Cases of Carbon Peak and Carbon Neutralization in Urban and Rural Construction compiled by the Technology and Industrialization Development Center of the Ministry of Housing and Urban-Rural Development was released a few days ago. Among the cases, Guiyang Distributed Sunken Reclaimed Water Ecosystem of the China Water Environment Group was selected for the collection. Among nearly 20 "city and community" projects in China, it was evaluated as a typical case with a low-carbon layout and was displayed in the first chapter, providing a replicable and promotable experience for urban planning layout and infrastructure construction.

The Collection of Typical Cases of Carbon Peak and Carbon Neutralization in Urban and Rural Constructionis a fundamental material for "research on the path of carbon peak and carbon neutralization during construction. This collection analyzes the specific practices of typical cases that can be replicated and promotable from two aspects, including technical standards and management mechanisms. In this case, the China Water Environment Group changed the traditional mode of large-scale interception and centralized end treatment to a distributed mode based on the principle of "moderate concentration, local treatment and nearby reuse". It built, renovated, and expanded 21 sunken reclaimed water plants along the main tributaries of Nanming River, with 185 kilometers of ecological restoration of the river. It thus formed an innovative technology system of distributed sunken reclaimed water ecosystems for sewage treatment and resource utilization at an urban scale.

Distributed sunken reclaimed water plant could fully utilize the cold and hot energy of reclaimed water and adopted a sewage source heat pump system to provide heating and cooling to offices, science museums and surrounding communities near the water plant. So far, the system has covered a service area of over 500,000 square meters, which could reduce about one-third of energy consumption and carbon emissions, compared with traditional heating and cooling methods. By greatly reducing the direct and indirect carbon emissions by the urban sewage system, the sewage source heat pump system and ground-surface green plants could increase systemic carbon sink. With these endeavors, the total carbon emission reduction could exceed 40,000 tons per year, which not only cut the cost of operation cost, pipeline network construction, and investment, but also realized green and low-carbon development of the city.

The Guiyang Distributed Sunken Reclaimed Water Ecosystem, with its distributed mode, has successfully minimized the risk of additional demolitions and relocations. This approach has effectively reduced the risk of re-demolition and re-relocation. Its success suggests potential applications in revitalizing high-density old town areas, providing valuable insights for the optimal arrangement of urban sewage facilities and the upgrade of sewage systems.