Adsorption with biodegradation for decolorization of reactive black 5 by Funalia trogii 200800 on a fly ash-chitosan medium in a fluidized bed bioreactor-kinetic model and reactor performance.
A non-steady-state mathematical model system for the kinetics of adsorption and biodegradation of reactive black 5 (RB5) by Funalia trogii (F. trogii) ATCC 200800 biofilm on fly ash-chitosan bead in the fluidized bed process was derived. The mechanisms in the model system included adsorption by fly ash-chitosan beads, biodegradation by F. trogii cells and mass transport diffusion. Batch kinetic tests were independently performed to determine surface diffusivity of RB5, adsorption parameters for RB5 and biokinetic parameters of F. trogii ATCC 200800. A column test was conducted using a continuous-flow fluidized bed reactor with a recycling pump to approximate a completely-mixed flow reactor for model verification. The experimental results indicated that F. trogii biofilm bioregenerated the fly ash-chitosan beads after attached F. trogii has grown significantly. The removal efficiency of RB5 was about 95 % when RB5 concentration in the effluent was approximately 0.34 mg/L at a steady-state condition. The concentration of suspended F. trogii cells reached up to about 1.74 mg/L while the thickness of attached F. trogii cells was estimated to be 80 μm at a steady-state condition by model prediction. The comparisons of experimental data and model prediction show that the model system for adsorption and biodegradation of RB5 can predict the experimental results well. The approaches of experiments and mathematical modeling in this study can be applied to design a full-scale fluidized bed process to treat reactive dye in textile wastewater.
Department of Safety, Health and Environmental Engineering, Central Taiwan University of Science and Technology, 666, Bu-zih Road, Bei-tun District, Taichung, 40601, Taiwan. yhlin1@ctust.edu.tw
Yen-Hui
YH
Lin
Wen-Fan
WF
Lin
Kai-Ning
KN
Jhang
Pei-Yu
PY
Lin
Mong-Chuan
MC
Lee
D000327:Adsorption; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D048271:Chitosan / Q000378:metabolism; D004396:Coloring Agents / Q000737:chemistry / Q000378:metabolism*; D055453:Coriolaceae / Q000737:chemistry / Q000378:metabolism*; D003470:Culture Media / Q000378:metabolism; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D007700:Kinetics; D008962:Models, Theoretical; D009282:Naphthalenesulfonates / Q000737:chemistry / Q000378:metabolism*
D004396:Coloring Agents; D003470:Culture Media; D009282:Naphthalenesulfonates; D048271:Chitosan; C063421:Remazol black B