Wastewater Treatment System
Mahidol University, Salaya Campus established in 1980 which has a few staff and students; therefore, the university used oxidation ponds wastewater system. When the number of staff and students went over 30,000 and over 80 buildings had rapidly increased; for example, lecturer theaters, student dormitory, condominium, and food center, the oxidation ponds wastewater system could no longer support wastewater. Therefore, there are a high quantity of wastewater flooded to surface water resources. Activated sludge wastewater system had been constructed in 2012 which could support 3,000 cubic meter of wastewater per day. The system gathered wastewater from 17 divisions which were 1) College of Sports Science and Technology; 2) Student Dormitory, Student Affairs Division;3) Mahidol Learning Center: MLC; 4) Faculty of Engineering; 5) International College; 6) Faculty of Social Sciences and Humanities; 7) Faculty of Science; 8) Graduate Studies; 9) Faculty of Information and Communication Technology; 10) Mahidol University Library and Knowledge Center; 11) Faculty of Environment and Resource Studies;12) Institute of Nutrition; 13) ASEAN Institute for Health Development; 14) Research Institute for Languages and Cultures of Asia; 15) Institute for Innovative Learning; 16) Institute of Molecular Biosciences; and 17) MU-Bio Innovation Building. Other divisions are new buildings and have their own wastewater treatment system.
Division of Physical Systems and Environment tracks quality of surface water every month. This is to maintain environment surrounding Mahidol University and to promote well-being of staff and students. The wastewater system of the university is based on laws according to Pollution Control Department, Ministry of Natural Resources and Environment. Staff and students can check water quality on this website,
Activated sludge wastewater system composes of 2 important parts which are aeration tank and sedimentation tank. Wastewater will be sent to aeration tank which contains many microorganisms. These microorganisms will decompose organics in wastewater to become carbon dioxide and water. Treated wastewater will be discharged to the sedimentation tank to separate sludges from clear water. Sludges, which were separated, fell down at the bottom of the sedimentation tank, but a partial of them was excess sludge. This will be made to fertilization. Clear water at the top is wastewater sent to chlorine exposure tank. Bio-chlorine which is environmentally-friendly for organisms is used with treated wastewater, and will be discharged to canals in the university.