OPTIMIZATION OF THE BATCH BIODEGRADATION PROCESS ON REVITALIZATION OF POLLUTED RIVER WATER RECEIVING INDUSTRIAL EFFLUENTS CASE STUDY” CIKAKEMBANG RIVER”

• Main Author: BOUNTHAVY, Chitnakone
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/51812
• Institution: Institut Teknologi Bandung

Cikakembang River is one of Citarum River tributaries which become a location of wastewater discharges from industry, agriculture, and domestic area. The differences in land use around Cikakembang River is predicted to cause different characteristic of pollution from upstream to downstream. According to the Environmental Agency of Bandung Regency, Cikakembang River was the most polluted tributary in Bandung District. It is important to revitalize the river to improve its capacity. This research is aimed to find the optimum condition to improve the biodegradation process by using a variety of conditions such as aeration, nutrient and microbe addition. There are three methods used to measure the biodegradation process. CO2 evolution method was used to measure the CO2 production in every one and half-hour. Another method used is measuring the decrease of the organic compounds in the form of COD in every three hours and the optical density (OD600) will be used to measure the growth of microorganisms in the reactor. The results showed that the aeration effect on the biodegradation process and the combination of aeration, nutrient and microbial reactor were able to reduce the organic content of COD with 71.79% efficiency. While the high cumulative of CO2 produced also occurs in the reactor of the combination of aeration, nutrient and microbial addition. To explain the process that occurs in a batch- reactor, several kinetics models are used, namely first-order, diffusional, and Singh. Singh's kinetics and diffusional are the closest to the saturation constant value (k3 and k2). The combination of aeration, nutrient and microbial reactor is the optimum process of biodegradation with k3 = 0.3793. In continuous experiments with consideration of nutrient and microorganism addition, shows that the reactor without nutrient and 1 ml of microbial addition (3RN0M1) and the reactor with 1 ml of nutrient and 1 ml of microbial addition (4RN1M1) give the highest on the biodegradation with the COD removal efficiency of 58.4% and 55.3%, respectively. To illustrate the processes that occur in a continuous process, the Singh kinetics model and diffusional models give better results than the first order with saturation constant values (k3) for the reactor without nutrient and 1 ml of microbial addition (3RN0M1) and the reactor with 1 ml of nutrient and 1 ml of microbial addition (4RN1M1) was 0.2753 and 0.2224, respectively.