Water Recycling

Water recycling program implementation

The primary sources of recycled water at National Chiayi University are general wastewater, livestock wastewater (also known as reclaimed water), and rainwater.  The water Recycling Program Implementation at Chiayi University is described as follows:

1. General wastewater (Domestic Sewage): The general wastewater treatment equipment, including the mixing tank, coagulation tank, gelation tank, primary sedimentation tank, aeration tank, and final sedimentation tank, are installed in most buildings on campus.  Before the water is discharged, it flows into a retention pond P2 through the main drain.  This reclaimed water in the retention pond P2 is used to irrigate plants on campus.  The storage capacity of Detention Pond P2 is approximately 6,900 tons.  The reclaimed water from the Integrated Teaching Building is also used to clean the solar panels.

2. Livestock wastewater: The animal excrement of cattle, pigs, and other animals in the animal research farm is collected to the livestock sewage treatment plant, and after treatment of solid-liquid separation, wastewater adjustment tank, anaerobic tank, contact oxidation pool, and sedimentation tank, water is collected to the water towers for cleaning of the livestock house.  The amount of reclaimed water used for cleaning animal houses daily is approximately 93 tons.

3. Rainwater: In 2023, we constructed a rainwater storage system beneath the sixth parking lot at the university. This system can retain up to 148 tons of rainwater, which can supply water for aquatic species cultivation and irrigation of plants in the horticulture department. In addition, there are rainwater storage tanks under the courtyard garden of the College of Science and Engineering. Some of the collected rainwater there is used for watering plants, while the rest flows into the water circulation system of the ecological pond.

4. Rainwater/Reclaimed water stored in the raft foundation: 942.06 tons of rainwater/reclaimed water is under the Library Building's raft foundation. Therefore, the university established a recycled water system for flushing toilets. The water from the raft foundation is pumped out, disinfected, and then used for flushing the toilets underneath the library's lowest floor.

The main objective of the "Water Recycling Program Implementation" is to achieve water conservation and savings through recycling and reuse. These methods contribute to environmental protection, reduce water expenses, and reflect our commitment to sustainable development.