Pollution Model of Batik and Domestic Wastewater on River Water Quality

Abstract

Human activities create waste that can affect the river's water quality physically, chemically, and biologically. Waste pollution from non-point sources is difficult to control where it spreads with a fairly even flow of discharge. Some watersheds in Indonesia have specific non-point source sources of pollution such as batik waste originating from Small and Medium Enterprises (SMEs). The research case study is in an urban area in the segment of the Premulung river segment of Solo City. This study aims to explain the effects of various pollutants on water quality, such as batik waste and domestic waste. Premulung River water samples were taken at 13 points from non-point sources and 10-point sources. The prediction model uses Qual2kw software. The results showed that the flow of batik waste from SMEs affected water quality in the COD parameters and the colour changed temporarily and quickly along the river channel. Rivers which is polluted by batik waste have the characteristics of dark water with high organic matter content. At the downstream river, water quality improves because batik waste will settle to the bottom of the river at a certain distance.