Sewage Disposal 

In NCYU, there are two types of sewage, domestic and animal husbandry sewage, which are discharged after proper treatment.  Sewage treatment equipments including mixing tank, coagulation tank, gelation tank, primary sedimentation tank, aeration tank, final sedimentation tank are installed in the building.  Domestic sewage can be discharged after being treated by the above facilities.  After treatment, domestic sewage flows into a retention pond through the main drain. After water quality testing confirms that it meets the discharge standards, the sluice gate is opened to release the water into the Bazhang River. The canteen kitchen sewage treatment process is shown in the figure and the final released water is also incorporated into the domestic sewage treatment process.  

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.   The discharged water is inspected regularly twice a year. The inspection items include the temperature of the discharged water, pH value, SS (Suspended solids), COD (Chemical oxygen demand), and BOD (Biochemical oxygen demand). All tests are in compliance with the standards set by the government. 

In 2022, Chiayi University secured the "Common Good Water Resources" project. In this project, we set up a mobile pure water system to purify the recycled water into drinking water.  The system can produce 24 CMD (Cubic Meters per Day) of water daily.