ANALYSIS OF RIVER POLLUTION LEVEL DUE TO TOFU INDUSTRY WASTE USING THE POLLUTION INDEX METHOD IN BATURETNO VILLAGE, BANTUL

Abstract

Currently, the industrial sector in Indonesia is increasingly growing and diversifying, resulting in various industries contributing significantly to the discharge of liquid waste into rivers. The liquid waste from tofu production contains high levels of organic substances such as COD and BOD. The tofu industry in Karangturi Padukuhan, Baturetno Village, Bantul, Yogyakarta, produces wastewater of 6000 liters per day. This wastewater is directly discharged into the river streams without any prior treatment, which can harm the aquatic life in the river and disrupt the river's water quality. The study aims to analyze the river water quality impacted by tofu waste using the pollution index method and to assess the compliance of the wastewater with water quality standards. The research methodology includes quantitative and qualitative methods, involving data collection through literature sources and the measurement of physical and chemical parameters by laboratory testing. The study indicates that the wastewater produced by the tofu factory exceeds the water quality standards for the river flowing. Based on the pollution index (IPj) method, the river flowing through Karangturi Padukuhan, Baturetno Village, Bantul, experiences mild pollution, which IPj value have varied from 0,95 – 4,49 at point A, and 6,89 – 7,35 at point B.