China's Wastewater Plants Now 'Resource Factories'

China is pioneering a shift from energy-intensive wastewater treatment to carbon-negative biorefineries, a key strategy within its 15th Five-Year Plan (2026-2030) for a circular economy. This transition redefines wastewater plants as "resource factories," capable of converting waste into valuable materials and energy. Tianjin's Zhangguizhuang plant exemplifies this by achieving full utilization of reclaimed water for industrial and municipal use, processing sludge into nutrient-rich soil, and employing on-site renewable energy.

Hangzhou's Yuhang Phase IV plant showcases integration with urban spaces, with a fully buried facility topped by an ecological park, providing reclaimed water for environmental uses. In arid Yinchuan, reclaimed water is essential for water security, supporting ecological flow and industry. Chongqing and Zhejiang are also innovating, with sludge gasification and energy-efficient treatment upgrades.

Scaling these "resource factory" models requires aligned incentives, green financing, and adaptable technical standards. Beijing demonstrates large-scale integration, using municipal wastewater heat pumps for heating/cooling and biogas from sludge for power generation. China's advancements offer a replicable model for global environmental governance, supporting domestic energy security and carbon neutrality goals.