Sewage Disposal 

       National Chiayi University has established a complete sewage treatment system that integrates physical, chemical, and biological processes, achieving tertiary-level treatment and promoting wastewater recycling and reuse on campus.  The detailed implementation is described as follows:

•    Domestic Sewage Treatment

Domestic sewage is treated through a comprehensive series of facilities, including a mixing tank, coagulation tank, gelation tank, primary sedimentation tank, aeration tank, and final sedimentation tank.  After treatment, the effluent flows into a retention pond and is discharged into the Bazhang River only after passing water quality tests.

•    Canteen Kitchen Sewage

Kitchen wastewater is pre-treated using screens and grease traps before entering the domestic sewage treatment system.  This process effectively removes suspended solids and oil content to prevent clogging and maintain stable downstream treatment efficiency.

•    Livestock Sewage Treatment

Wastewater from the animal research farm (cattle and pigs) is processed through a dedicated livestock sewage treatment plant, consisting of solid–liquid separation, wastewater adjustment tanks, anaerobic tanks, contact oxidation pools, and sedimentation tanks.  Approximately 6,691 tons of reclaimed water are produced every month and reused for cleaning livestock houses.  The discharged water is inspected twice yearly for parameters such as temperature, pH, suspended solids (SS), chemical oxygen demand (COD), and biochemical oxygen demand (BOD), ensuring compliance with national discharge standards.

•    Common Good Water Resources Project

Since 2023, the university has launched the “Common Good Water Resources” Project, which includes a mobile pure water system capable of purifying reclaimed water into drinking water, producing up to 24 m³ per day.  This initiative demonstrates the university’s innovation in water recycling and supports sustainable water resource management.

•    Achievement:

All wastewater generated on campus is treated to tertiary standards and partially recycled for reuse, fulfilling the “Treated with tertiary treatment” category.