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Title: Biodesulfurization of hydrodesulfurized diesel in a trickle bed reactor—Experiments and modeling
Authors: Mukhopadhyaya, M
Chowdhury, R
Bhattacharya, P
Keywords: Bio-desulfurization
Intrinsic kinetic parameters
Monod model
Trickle bed reactor
Issue Date: May-2006
Publisher: CSIR
IPC CodeC10L1/10
Abstract: Hydrodesulfurized diesel [sulfur content, 200-540 ppm (mg/dm3)] has been used for bio-desulfurization using Rhodococcus sp. Biomass concentration with the progress of time has been determined using dry cell weight method. Batch studies have been conducted with a two phase medium [non-aqueous to aqueous phase ratio, 10:90 to 100:0 (i.e. 0-100% diesel)]. Sulfur concentration has been determined using a Universal Oil Products (UOP) standard method (UOP 357-80). Microbial strains have been observed to follow classical Monod type growth kinetics under the present range of substrate concentration. A systematic and programmed analysis was made to determine following intrinsic kinetic parameters: maximum growth rate (µmax), 0.096 h-1; and half saturation constant (Ks), 71 mg/dm3. Biodesulfurization of hydrodesulfurized diesel has been conducted in a trickle bed reactor (diam, 0.066 m; height, 0.6 m) under continuous mode. Pith balls have been used as the immobilization matrix for the microorganisms with a constant bed porosity of 0.6. Flow rate of inlet diesel has been varied (0.25-0.5 dm3/h). Sulfur conversion up to 99% has been achieved. A mechanistic mathematical model, developed for the trickle bed bioreactor, can explain the reality satisfactorily.
Page(s): 432-436
ISSN: 0975-1084 (Online); 0022-4456 (Print)
Source:JSIR Vol.65(05) [May 2006]

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