Water recycling program implementation

National Chiayi University has established a comprehensive Water Recycling Program that integrates the treatment and reuse of general wastewater, livestock wastewater (reclaimed water), and harvested rainwater across all campuses.  The program is jointly managed by the Environmental Protection and Safety Management Center and the Office of General Affairs, ensuring regular monitoring, maintenance, and performance evaluation of water reuse efficiency.

· General wastewater: Most campus buildings are equipped with treatment facilities, including mixing, coagulation, gelation, sedimentation, and aeration tanks. Treated water flows into Retention Pond P2 (6,900 tons capacity), and the reclaimed water is reused for campus plant irrigation and cleaning of solar panels at the Integrated Teaching Building.

· Livestock wastewater: At the Animal Research Farm, wastewater is treated through solid–liquid separation, anaerobic, and oxidation processes. The reclaimed water (6,691.06 tons) is reused daily for cleaning livestock houses.

· Rainwater harvesting: A 148-ton underground storage system beneath the sixth parking lot supplies water for aquatic species cultivation and irrigation in the Department of Horticulture. Additional storage tanks beneath the College of Science and Engineering garden and the Library’s raft foundation (974.61 tons) provide recycled rainwater for ecological pond circulation and toilet flushing.

This campus-wide system effectively reduces the demand for municipal water, strengthens water security, and demonstrates NCYU’s long-term commitment to sustainable water management under SDG 6 (Clean Water and Sanitation) and SDG 12 (Responsible Consumption and Production).