Preecha Loosereewanich creator Nguyen, Cong Thanh Chairperson Orth, H.M. Examination Committee Samorn Muttamara Examination Committee USAID-ASEAN Scholarship Donor text th Bangkok Asian Institute of Technology 1983 continuing eng 100 leaves : ill. A number of regression equations of capital cos-t and operation and maintenance cost of several treatment processes was established from the analysis of 80 treatment plants located in the Greater Bangkok Area, Thailand. Past costs were adjusted for inflation, material and labour cost fluctuations. In this study, the most important cost determinants were found to be design wastewater flow, BOD loading and population equivalent. Suspended solid loading was also a significant determinant of chemical treatment capital cost. This study revealed that influent BOD had no direct effect on the cost. Influent COD was instead one of the cost determinants of oxidation ditch capital cost. The empirical cost equations developed in this study are just for es- timation. With some modification and restriction, they may help to deter- mine actual costs. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science Thesis (M.Sc.) - Asian Institute of Technology, 1983 Water quality management Nepal Phewa Lake Asian Institute of Technology. 301098 20260818085300.0