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Sulfide oxidation in fluidized bed bioreactor using nylon support material.

Varsha Midha¹, M K Jha, Apurba Dey

¹Department of Chemical Engineering, National Institute of Technology, Jalandhar 144011, India. barkha75@rediffmail.com

Journal of Environmental Sciences (China)

|June 5, 2012

Summary

This study optimized sulfide oxidation in a fluidized bed bioreactor (FBBR) for wastewater treatment. Optimal conditions achieved 92% sulfide removal with 70% sulfur formation, demonstrating effective biological treatment.

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Area of Science:

Environmental Engineering
Biotechnology
Wastewater Treatment

Background:

Sulfide wastewater poses environmental risks and requires efficient treatment.
Fluidized bed bioreactors (FBBRs) offer a promising approach for biological wastewater treatment.
Nylon support particles were utilized for biofilm development in the bioreactor.

Purpose of the Study:

To investigate the efficiency of a continuous fluidized bed bioreactor (FBBR) for sulfide oxidation.
To determine the optimal hydraulic retention time (HRT) and upflow velocity for sulfide removal.
To analyze the impact of operational parameters on sulfide oxidation rate using a statistical model.

Main Methods:

A continuous fluidized bed bioreactor (FBBR) with nylon support particles was operated at varying HRTs (25-75 min) and upflow velocities (14-20 m/hr).
Mixed microbial cultures from tannery effluent activated sludge were used to establish biofilm on support particles.
A statistical model was employed to analyze the effects of operational parameters on sulfide oxidation.

Main Results:

Sulfide oxidation efficiencies ranged from 90% to 92% across tested conditions.
Biofilm thickness reached (42 ± 3) µm after 15 days, indicating successful biofilm formation.
The highest sulfide oxidation (92%) with 70% sulfur formation was achieved at 75 min HRT and 14 m/hr upflow velocity.

Conclusions:

Fluidized bed bioreactors are effective for treating sulfide wastewater.
Upflow velocity and hydraulic retention time have a slight influence on sulfide oxidation rate.
Optimal performance for sulfide oxidation and sulfur production was observed at 75 min HRT and 14 m/hr upflow velocity.