SIMULATION OF RIVER WATER QUALITY IN DKI JAKARTA PROVINCE USING THE QUAL2KW MODEL CASE STUDY: CILIWUNG RIVER SEGMENT 5

• Main Author: ALYA MAULIDA, FALIHA
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/61446
• Institution: Institut Teknologi Bandung

A river is a water resource that is very important for human life. However, liquid waste disposal into the river causes polluting costs, especially organic matter in the river, to continue to increase. This study aims to calculate the river pollution index then simulate the quality of river water for organic parameters namely BOD and DO on various scenarios using the QUAL2Kw model and calculate pollution load based on modeling results. Based on the calculation of pollution indices, it is known that all rivers in DKI Jakarta can be categorized as heavily polluted. After weighting, the Ciliwung River (segment 5) is considered to meet the river criteria that will be the object of study. The calculation of wastewater discharge is carried out as input for diffuse source in modeling using Qual2kw. The calibration of the river water quality parameter model is carried out by doing trial and error on various kinetic parameters of the model. The RMSPE value obtained for the BOD model calibration is 2.45% and for the DO model of 3.84%. Although there is still incompatibility (error) in the model, because data on water quality observations is limited, then incompatibility in this model is considered acceptable and can be used for simulation. Based on the sensitivity analysis that has been done, the kinetic parameters of the most affecting the results of modeling for BOD parameter are slow CBOD hydrolysis rates and detritus dissolution rates, while for DO parameter is fast CBOD Oxidation Rate. The simulation results show that for the DO parameter in all scenarios, water quality only meets class 4 quality standards for point A, B, C, and D while upstream meet class 3. Meanwhile, for BOD parameters on scenarios 1, 3, and 4, water quality only fulfills class 4 quality standards, while upstream meets class 3. specifically for scenario 2, water quality meets class 3 quality standards at all points. The calculation of the BOD pollution load shows that for every scenario, the actual BOD pollution load is higher than the maximum BOD pollution load, or in other words, BOD pollution loads that enter the river are greater than the amount allowed. To be able to meet the amount allowed, BOD pollution expenses need to be reduced by 30% -70%. The modelling of river water quality can be used as a tool in formulating water quality management strategies.