The strategy of Tukad Badung pollution control using QUAL2Kw and AHP

Tukad Badung is the major river flowing through Denpasar, the capital city of Bali Province, Indonesia. It is polluted by domestic dan industrial waste which is contributed by surrounding communities such as hotels, shopping area, animal husbandry, printing industries, tofu and tempeh industries industry, and housing area. This research aims to analyse the quality of the water and determine the best among options provided to overcome the pollution problem conducted by using two analytical programs, i.e. QUAL2Kw and Analytical Hierarchy Process (AHP). According to the results of QUAL2Kw analysis, several parameters of water quality of Badung River did not meet the Indonesian standards of water quality stated in Regulation Number 82 the Year 2001 about Water Quality Management and Water Pollution Control. The TSS reached 111.02 kg/day, the BOD reached 92.24 kg/day, and the COD reached 440.92 kg/day. Whereas the pollution load capacity is only 15.43 kg/day for TSS, 19.68 kg/day for BOD, and 7.45 kg/day for COD. This problem occurred was due to the home industries activities in the upstream part of the Badung River. The result of the Analytical Hierarchy Process (AHP) shows that “improving monitoring and supervision of waste disposal” has the highest composite weight value of 0.317. Among a series of solutions offered, this result suggests that the local government should take actions to impose the regulations on wastewater disposal to the river stream by surrounding communities especially the small and middle-size enterprises.