Evaluating the Efficiency of Bio-Based Catalysts in Wastewater Treatment Processes

Thesis Abstract

The escalating contamination of water bodies due to industrial effluents necessitates sustainable and efficient wastewater treatment strategies, with bio-based catalysts emerging as promising eco-friendly alternatives to conventional chemical catalysts. This study aims to evaluate the performance and efficiency of bio-based catalysts derived from agricultural waste materials, specifically focusing on their application in the degradation of organic pollutants in wastewater treatment processes. The investigation is structured around three specific objectives (1) to characterize the physicochemical properties of bio-based catalysts produced from banana peels and rice husks; (2) to assess the catalytic activity of these bio-catalysts in the degradation of phenolic compounds and dyes commonly found in industrial wastewater; and (3) to compare the efficiency of bio-based catalysts against traditional chemical catalysts under laboratory conditions. The research adopts an experimental research design within a positivist paradigm, systematically testing the catalytic efficiency of bio-based catalysts in controlled laboratory setups. The study population comprises laboratory-simulated wastewater samples containing known concentrations of phenolic compounds and synthetic dyes. A sample size of 30 batches per catalyst type was used to ensure statistical robustness, with each batch representing a treatment unit. The catalysts were prepared through standardized pyrolysis and activation procedures, following protocols adapted from recent literature. Data collection instruments include spectrophotometric analysis for pollutant concentration measurements, Fourier Transform Infrared (FTIR) spectroscopy for catalyst characterization, and Scanning Electron Microscopy (SEM) for surface morphology analysis. The validity and reliability of these instruments were established through calibration with certified standards and repeated measures, respectively. Data analysis involves the application of descriptive statistics, Analysis of Variance (ANOVA), and Regression Analysis to determine the significance of differences in pollutant removal efficiencies among the catalysts. Theoretical frameworks underpinning this study include the Langmuir-Hinshelwood kinetics model to describe catalytic degradation processes and the Theory of Sustainable Development, emphasizing eco-efficiency and resource utilization. These frameworks facilitate a mechanistic understanding of the catalytic reactions and contextualize the environmental benefits of bio-based catalysts. Anticipated findings suggest that catalysts derived from banana peels and rice husks will demonstrate high efficacy in degrading phenolic compounds and dyes, with removal efficiencies exceeding 85%, comparable to or surpassing conventional chemical catalysts under optimized conditions. The study expects to reveal that bio-based catalysts exhibit favorable surface properties and active sites conducive to pollutant adsorption and breakdown, supported by FTIR and SEM analyses. It is also hypothesized that the kinetics of degradation follow predictable models, with potential variations attributable to catalyst surface morphology and composition. The contribution of this research to scientific knowledge lies in providing empirical evidence of the viability and effectiveness of agricultural waste-derived bio-catalysts in wastewater treatment, advancing the understanding of their operational mechanisms. It also offers insights into sustainable catalyst production and application, promoting waste valorization and environmental conservation. The main conclusion infers that bio-based catalysts, specifically those from banana peels and rice husks, constitute viable and sustainable alternatives for industrial wastewater treatment processes, with significant implications for environmental policy and practice. Recommendations include scaling up catalyst production, optimizing process parameters for large-scale applications, and integrating bio-catalysts into existing treatment infrastructure. Future research should explore long-term stability and reusability of bio-catalysts in continuous flow systems, as well as their effectiveness across diverse pollutant matrices and real wastewater samples to corroborate laboratory findings.