Shaanxi Wastewater Treatment Plant, Changwu County, Xianyang, Shaanxi

The Shaanxi wastewater treatment plant is located in Changwu County, part of Xianyang City in Shaanxi Province, China. It serves a population of approximately 30,000 people, classifying it as a medium-sized agglomeration under Chinese wastewater regulations. China's wastewater treatment standards are governed by the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), which mandates secondary treatment with nutrient removal for plants serving over 10,000 people. Plants of this scale typically employ biological treatment processes such as activated sludge or sequencing batch reactors to meet Class 1-A or 1-B effluent standards. The plant's treated effluent is discharged into local waterways that ultimately drain into the Wei River, a major tributary of the Yellow River. The Wei River basin supports agricultural irrigation and provides water for industrial and domestic use downstream. Protecting water quality in this basin is critical for the ecological health of the Yellow River system and the communities that depend on it.

The plant discharges into the Wei River basin, which flows into the Yellow River, the second-longest river in China. The Wei River is a vital water source for agriculture and industry in Shaanxi Province. The downstream Yellow River supports diverse aquatic life and provides water for millions of people. Effective wastewater treatment is essential to prevent eutrophication and maintain water quality in this ecologically and economically important watershed.