What appears as a serene urban garden in Hangzhou is actually the crowning glory of China's most innovative water treatment plant. Beneath the Chengbei Water Purification Plant's lush rooftop park lies a high-tech wonder - a fully subterranean facility that's become a pilgrimage site for water experts nationwide.                           

Since its April 2024 launch, this space-saving marvel has quietly processed 100,000 cubic meters of wastewater daily across 74.4 mu - all hidden from view. Above ground, visitors enjoy an evergreen oasis that transforms urban infrastructure into a breathtaking escape.                                                  

The magic happens in the control room, where engineers swap waders for VR headsets. Cutting-edge IoT sensors and AI create digital "twins" of the entire underground network, allowing virtual inspections of every pipe and valve. Real-time data streams enable smart adjustments without ever descending below.                      

Sustainability flows through every aspect: purified water nourishes the park and cleans streets, while waste heat powers the plant's climate control. In Hangzhou, even sewage treatment has blossomed into an inspiring model of green innovation.