PEMODELAN OKSIGEN TERLARUT (DO) DAN KEBUTUHAN OKSIGEN BIOKIMIA (BOD) PADA SEGMEN INTAKE BABAKAN SILIWANGI MENGGUNAKAN SISTEM DINAMIK

• Main Author: Amri, Hilfi
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/35776
• Institution: Institut Teknologi Bandung

The Cibarani Channel is a water pathway that runs along local residential areas in the Ciumbuleuit region, Bandung. As time progresses, this channel shifted its function from providing water for the local people consumption into a domestic sewage channel headed to Cikapundung River. As a result, the quality of the stream had plummeted causing a rise in the processing cost in a nearby drinking water treatment plant. Thus, several units were disabled, including the intake unit at Babakan Siliwangi. The mentioned quality includes: Dissolved Oxygen (DO) and Biochemical Oxygen Demand (BOD). A model is needed to explore the future possibilities of improving these qualities in accordance to the standard quality of Government Regulation No. 82 of 2001 on Water Quality Management and Water Pollution Control. This study was performed using STELLA 9.1.3 – a program that uses the principles of system dynamics modeling. DO and BOD models were developed based on the Streeter-Phelps equation. It states that the DO concentration is influenced by two processes, namely reaeration and deoxygenation. Both are represented by the flow process in STELLA. On the other hand, the BOD concentration is affected by deoxygenation process and organic sedimentation. Deoxygenation is represented as a flow, whereas organic sediment is classified as a converter. Calibration and validation processes are required to produce an accurate model. The calibration process is performed on the input such as the kd constant and the BOD input value. Validation results based on MAPE (Mean Absolute Percentage) shows a value of 3.84%. It means that the model has a superb accuracy. Assessment is done by establishing policy implementation scenarios that accommodate six assumptions impact on the quality of Cibarani inlet, or the quality and quantity of Cikapundung River. Neither any of the six scenarios provides quality results in accordance with the quality standards. The best scenario is the one that assumes that Cibarani inlet qualities have improved with the existing Cikapundung flow conditions.