Abstract:
According to the increasing number of population and rapid expansion of the current civilization, demand of water has been increased. Tap water which we currently used has production cost. Therefore, if people can use recycle water, natural resources and water bills of the university can be saved. In this research, three types of water treatment systems from washbasin are studied in order to reuse water in toilet of academic building. The water was collected from washbasins of male and female restrooms from the 2nd to the 9th floors of the 88 building at the King Mongkuts University of Technology North Bangkok. The water was treated and reused in urinal closet and flush tanks in male and female restrooms at the 1st floor of the building. The water quality from the three treatment systems were compared to the guideline values for domestic reclaimed water used in toilet and urinal flushing in Canada. The treatment system with aeration tank, a sand filter tank, and activated carbon tank is the most suitable treatment system for reuse water in toilet from wash basin of academic building. The system has ability to reduce the TSS, BOD5, and Turbidity for 93%, 75%, and 91%, respectively. Moreover, the Fecal Coliforms, E.coli bacteria, and Chlorine residual were not found from the treated water. The system can produce recycle water up to 640 liters per day with an installation cost of 44,990 Baht.