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Chevakidagarn, P. Operational problems of wastewater treatment plants in Thailand and case study: wastewater pollution problems in Songkhla Lake Basin Songklanakarin J. Sci. Technol., 2006, 28(3) : 633-639 By surveying 63 central municipal wastewater treatment plants throughout Thailand, it was found that about 80 percent of them did not function as expected (Pollution Control Department, 2004). Most of the problems were inadequate performance and operational problems. Concerning the Songkhlafatcat:idenv33tnneitkex426x4upac4