A Case Study of a Sewage Treatment Plant in a District of Xi’an, Shaanxi Province

II. Process Technology and Effluent Standards
The facility employs advanced wastewater treatment technologies, primarily utilizing the Sequencing Batch Reactor (SBR) activated sludge process. This method offers high treatment efficiency, operational flexibility, and low energy consumption, enabling effective removal of organic matter, nitrogen, phosphorus, and other pollutants. Treated effluent complies with Grade A requirements specified in the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants" (GB18918-2002). The discharged water is clear, odorless, and meets all regulatory environmental criteria, allowing direct release into natural water bodies or reuse for urban landscaping and scenic water features.

III. Environmental Benefits and Social Contributions
The successful operation of this wastewater treatment plant has substantially improved the urban water environment in Xi’an. It plays a critical role in pollution control, safeguarding the water quality of the local river basin, and maintaining ecological equilibrium. By effectively treating municipal wastewater, the facility has reduced contamination of rivers and lakes, enhanced aquatic habitats, and contributed to ecosystem restoration. Furthermore, the plant has improved the city’s overall investment climate, attracting additional enterprises and supporting sustainable regional economic development.