Water Recycling

Water recycling program implementation

The primary sources of recycled water at National Chiayi University come from 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 waste water (Domestic Sewage): The general waste water treatment equipments including mixing tank, coagulation tank, gelation tank, primary sedimentation tank, aeration tank, final sedimentation tank are installed in most building 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 for irrigation of 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 are 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 4,289 tons.

3. Rainwater: In 2022, 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 be used to supply water for aquatic species cultivation and for 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: Under the Library Building's raft foundation, there is a significant amount of rainwater/reclaimed water. 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 located underneath the lowest floor of library.

The main objective of the "Water Recycling Program Implementation" is to achieve water conservation and savings through recycling and reuse. These methods not only contribute to environmental protection and reduce water expenses but also reflect our commitment to sustainable development.