Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2010.1492.1510KlayklungRachasakTingsabadhCharitGajaseniNantana1220101015This research aims to determine the appropriate effluent tax scheme and construct an optimized mathematical decision making model in order to maximize profits while bearing economic and environmental constraints in the Thachin River basin. The Thachin River is ranked as the most polluted river in Thailand where pig farms, urban communities, aquaculture and industries significantly contribute to deteriorating water quality in the basin. Therefore, the comparison of applied mathematical models for uniform and non-uniform taxation were developed, This approach can prohibit the amount of pollution discharges from exceeding the total maximum daily loading of the river. As the results, the mathematical models indicated that applying the uniform tax policy is effectively more saving of 45.25% than the non-uniform tax policy in total expenses. By modifying the uniform taxation model to consider the amount of end-of-pipe pollution emissions, the aggregate amount of wastewater contaminant in the surface water and constraints of waste loading can be prohibited from exceeding the carrying capacity of the river ecosystem.]]>Abdel-Malek, L.L. and N. Areeratchakul,2007Bauman, Y., M. Lee and K. Seeley,2008Benli, B. and S. Kodal,2003Berman, O. and M. Cutler,2004Bluffstone, R. and B.A. Larson,1997Brechet, T. and P.A. Jouvet,2008Brown, A.M.,2001Brown, A.M.,2006Brown, G. Jr. and B. Mar,1968Brunenieks, J., A. Kozlovska and B.A. Larson,1997Callan, S.J. and J.M. Thomas,1996Cetin, E. and S.T. Esen,2006Collinge, R.A. and M.J. Bailey,1983Corrigan, J.R.,2009Dasgupta, S., M. Huq, D. Wheeler and C. Zhang,1996Den Elzen, M., P. Lucas and D. van Vuuren,2005Gallaher, M., C. Delhotal and J. Petruza,2005Glachant, M.,2002Gornaja, L., E. Kraav, B.A. Larson and K. Turk,1997Hanley, N., J.F. Shogren and B. White,1997Hanley, N., R. Faichney, A. Munro and J.S. Shortle,1998Hariga, M.A. and M.A. Al-Fawzan,2005Hass, J.E.,1970Herzog, H.W. Jr.,1976Indab, A.L., A.I. Guzman and R.T. Bagarinao,2003Jaffe, A.B., R.G. Newell and R.N. Stavin,2003Kuo, P.C., R.A. Schroeder, S. Mahaffey and R.R. Bollinger,2003Klepper, G. and S. Peterson,2006Kozeltsev, M. and A. Markandya,1997Markusen, J.R.,1997McKitrick, R.,1999Mehta, S., S. Mundle and U. Shankar,1997Misiolek, W.S.,1980Moffatt, I., N. Hanley and S. Hallett,1991Morris, G.E., J. Tiderenczl and P. Kovacs,1997Murty, M.N., S. Kumar and M. Paul,2006OIE,2006Owen, T.H., J. Myjavec and D. Jassikova,1997Paredes, M., M. Sartor and C. Masclet,2001Peretto, P.F.,2008PCD,1997PCD,2002PCD,2003PCD,2003PCD,2003PCD,2005PCD,2005PCD,2005Ravikumar, K., S.H. Kim and Y.A. Son,2007De Reyck, B. and Z. Degraeve,2006Soloveitchik, D., N. Ben-Aderet, M. Grinman and A. Lotov,2002Stavins, R.N.,2002Stepanek, Z.,1997Streeter, H.W. and E.B. Phelps,1958Thompson, D.B.,1998Upton, C.,1970Environmental Protection Agency,2007Walsh, S. and D. Diamond,1995World Economic Forum,2002Ylicz, T.,1996Ministry of Science,1992