IMMOBILIZATION OF MICROBIAL MIXED CULTURE AND ITS ACTIVITIES IN REDUCING ORGANIC CONTENT IN DOMESTIC WASTEWATER

• Main Author: Ganjar Prabowo, Himawan
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/46952
• Institution: Institut Teknologi Bandung

Domestic wastewater that contains organic compounds can potentially pollute the environment and cause eutrophication if not treated. One effort to reduce the organic content of wastewater is to use WWTP which utilizes biological processes. The biological process is good consider because the organic content of wastewater can be useful for microbial growth, inexpensive and does not produce harmful byproducts. In addition to using suspended microbes, water treatment at WWTP also uses microbial immobilization. The use of immobilized microbes is considered to have advantages, namely high cell concentration and being able to interact with extreme environments. In this study microbial immobilization was made with the aim of reducing organic content from domestic wastewater, with 3 variations of the use of microbes as much as 3 g, 6 g, and 9 g. The results showed that reactors with microbes of 3 g, 6 g and 9 g were able to reduce the organic content of COD with efficiencies of 81.3%, 87.5%, and 87.5%; BOD of 83.96%, 93.75% and 93.34%; and ammonia of 71.14%, 75.31% and 78.29%. To explain the reaction that occurs in batch-recirculation reactors, several kinetics models are used, namely first order, second order, and Singh. Of the three kinetics models, Singh's kinetic has the closest with saturation constant value (k) of k1 (3 g) = 0.4111, k1 (6 g) = 0.5254, and k1 (9 g) = 0.4762. Under continuous conditions using 6 g of immobilized microbes, the variation of COD concentration of wastewater is between 160 - 512 mg / L, ammonia 9.8 - 25.2 mg / L and total phosphate 1.57 - 4.76 mg / L and HRT 1 , 2, and 3 days the value of the removal efficiency was COD of 65.63% - 80%, ammonia removal between 50% - 80.51%, and total phosphate 32.14% - 60.06%. Meanwhile, to illustrate the processes that occur in a continuous reactor the Stover-Kincanon kinetic model gives better results than the first order and second order models. With saturation constant (KB) and the use of the maximum utilization rate substrate (Umax) is KB = 65.65 g / L. day, Umax = 10.63 g / L. day (variation 1); KB = 50.10 g / L. day, Umax = 6.14 g / L. day (variation 2), and KB = 86.85 g / L. day, Umax = 13.23 g / L. day (variation 3).