Abstract: A study of the water quality in the Surabaya river is conducted because of its function as the drinking water supply for the city of Surabaya as well as its support of agriculture, fisheries, livestock, industry and commerce. The site study is located along ±41 km from the Mlirip dam to the Jagir dam which has a catchment area of ±300 km2. The complexity of the problems that have occurred so far has caused a decrease in the quality and quantity of the Surabaya river water. Therefore, an effort to determine the pollution load capacity and control pollution strategy is needed. Data analysis uses the QUAL2Kw program application to calculate the pollution load that enters the Surabaya river. Analysis of priorities for water pollution control strategies uses the Analytic Hierarchy Process (AHP) method. The Surabaya river is divided into seven segments based on hydraulic data analysis, water quality and pollutant sources. The main parameters used in the QUAL2Kw simulation are BOD, COD and TSS. The analysis result of the maximum pollutant load for BOD parameters is 9,161 kgday-1, COD is 45,831 kgday-1 and TSS is 427,079 kgday-1. The maximum pollution load capacity for BOD parameters is 6,958 kgday-1, COD is 42,763 kgday-1 and TSS is 420,167 kgday-1. Based on the results of the AHP program, reducing the pollutant load and increasing the capacity of the Surabaya river can be determined through the following stages, namely: tightening waste disposal permits, industrial guidance and supervision, construction of domestic communal WWTPs, development of WWTP industrial area, enforcement of environmental law and socialization of riverbank communities.
Moh Sholichin and Shatirah Akib, 2020. Assessment of Pollution Load Capacity and Control Strategy in the Surabaya River using QUAL2KW and AHP Method. Journal of Engineering and Applied Sciences, 15: 1133-1139.