Abstract
Industrial effluents (Azo dyes) are brightly coloured, making their disposal into receiving waters undesirable not only because many Azo dyes and their breakdown products are toxic to aquatic life and mutagenic to humans, but also because many Azo dyes and their breakdown products are harmful to aquatic life due to the presence of aromatics and metals, chlorides, and other chemicals. Various kinetic models, including modified Gompertz, Baranyi-Roberts, modified Richards, Von Bertalanffy, modified Logistics, modified Schnute, Buchanan three-phase, and the most recently presented Huang, were used in this study. Based on statistical tests, the modified Schnute model provided the best fit, with the lowest values for RMSE and corrected Akaike Information Criteria (AICc), the greatest value for adjusted R2, and the closest to unity for both Accuracy and Bias Factor. The Modified Schnute parameters such as λ (lag time), µmax (maximum specific bacterial growth rate) and curve fitting parameters α and β (Constant), were found to be -4.39 (95% confidence interval of -77.58 to 68.79), 57.00 (95% confidence interval of -2854.30 to 2968.30), 0.78 (95% confidence interval of -0.34 to 1.89) and 0.96 (95% confidence interval of -0.85 to 2.78, respectively.
Highlights
The use of dyestuffs has risen steadily as a result of rapid industrialization and man's desire for colour [1]
The graphical data from Fig. 2. of the published work by Xun-an Ning et al [2] of decolorization and biodegradation of the azo dye congo red by an isolated Acinetobacter baumannii YNWH 226 was processed using the software Webplotdigitizer [16], which digitises the scanned graph and has been used and acknowledged by many researchers because of its precision and reliability [9,15,17,18]
Modified Schnute was shown to have the best performance based on the bacterial growth modelling (Figs. 1-8), with the lowest AICc, root-mean-square error (RMSE), and modified R2 values
Summary
The use of dyestuffs has risen steadily as a result of rapid industrialization and man's desire for colour [1]. Textile, paper, food, cosmetics, and pharmaceutical industries, dye is used as a colorant during the dyeing process. It is used in printing and dyehouses [1,2,6]. The textile finishing industry is well known for contributing to one of the highest levels of water pollution, as 10-15% of dyes are lost in the effluent during the dyeing process [5]. The azo-bonds (–N=N– ) present in the dye are reductively cleaved, releasing aromatic amines and removing the effluent's colour [2,3]. A variety of models for pollutant biodegradation have been published in several research [9,11,12,13,14,15]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Environmental Bioremediation and Toxicology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
