KINETIKA REAKSI PERTUMBUHAN BAKTERI PSEUDOMONAS FLUORESCENS PADA PROSES FERMENTASI AIR LINDI

Abstract

Abstrak: Air lindi merupakan limbah cair hasil dekomposisi sampah di Tempat Pemrosesan Akhir (TPA) yang berpotensi mencemari lingkungan karena kandungan bahan organik dan logam beratnya yang tinggi. Penelitian ini bertujuan untuk menganalisis kinetika pertumbuhan bakteri Pseudomonas fluorescens serta karakteristik fisik hasil fermentasi air lindi. Proses fermentasi dilakukan secara aerob selama 8 hari dengan variasi volume inokulum bakteri 5 mL, 7 mL, dan 10 mL dalam 100 mL air lindi. Parameter yang diamati meliputi pH, suhu, konsentrasi C-organik, dan jumlah koloni bakteri. Hasil menunjukkan peningkatan pertumbuhan bakteri secara signifikan pada fase logaritmik dengan pola linear hubungan antara ln(C_A0/C_A) dan ln(C_C/C_C0). Nilai koefisien determinasi (R²) mendekati 1, yang mengindikasikan kesesuaian dengan model kinetika pertumbuhan. Selain itu, terjadi penurunan kandungan C-organik dan logam berat, serta perubahan karakteristik fisik air lindi yang menunjukkan peningkatan kualitas hasil fermentasi. Dengan demikian, fermentasi air lindi menggunakan Pseudomonas fluorescens berpotensi mengurangi dampak pencemaran dan meningkatkan nilai guna air lindi sebagai hasil olahan ramah lingkungan.

Abstract: Leachate is a liquid waste generated from the decomposition of solid waste in landfill sites, which has the potential to pollute the environment due to its high content of organic matter and heavy metals. This study aims to analyze the growth kinetics of Pseudomonas fluorescens and the physical characteristics of leachate after the fermentation process. The fermentation was carried out aerobically for 8 days with variations of bacterial inoculum volumes of 5 mL, 7 mL, and 10 mL in 100 mL of leachate. The observed parameters included pH, temperature, C-organic concentration, and bacterial colony count. The results showed a significant increase in bacterial growth during the logarithmic phase, following a linear relationship between ln(C_A0/C_A) and ln(C_C/C_C0). The determination coefficient (R²) values were close to 1, indicating good conformity with the microbial growth kinetics model. In addition, there was a reduction in C-organic and heavy metal contents, as well as changes in the physical characteristics of the leachate, indicating improved quality of the fermentation product. Therefore, leachate fermentation using Pseudomonas fluorescens has the potential to reduce environmental pollution and enhance the usability of leachate as an environmentally friendly processed product.