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Hybrid reactor for priority pollutant nitrobenzene removal.
Partha Sarathi Majumder1, S K Gupta
1Centre for Environmental Science and Engineering, Indian Institute of Technology, Powai, 400076 Mumbai, India.
Water Research
|September 27, 2003
Summary
This study optimized a hybrid reactor for nitrobenzene wastewater treatment, achieving over 97% removal. The hybrid system effectively handles shock loads, demonstrating its robustness in industrial applications.
Area of Science:
- Environmental Engineering
- Biotechnology
- Wastewater Treatment
Background:
- Nitrobenzene is a toxic pollutant found in industrial wastewater.
- Effective treatment methods are crucial for environmental protection.
- Hybrid reactors offer potential for enhanced pollutant removal.
Purpose of the Study:
- To investigate the performance of a hybrid reactor (trickling filter and activated sludge) for nitrobenzene wastewater treatment.
- To optimize operational parameters for maximum nitrobenzene and COD removal.
- To assess the reactor's resilience to shock loading.
Main Methods:
- Acclimation of mixed microbial consortia with gradual nitrobenzene increase over 100 days.
- Optimization of hydraulic retention time (HRT), C:N ratio, and substrate:co-substrate ratio.
- Evaluation of shock load capacity and volatilization losses.
Main Results:
- Optimal HRT of 29.55 h yielded 95.83% COD and 97.93% nitrobenzene removal.
- Optimal C:N ratio of 100:20 and substrate:co-substrate ratio of 1:33 were determined.
- The system demonstrated stability against shock loads up to twice the usual concentration.
- Biological removal efficiency was calculated at 87.49%, with 9.44% loss due to volatilization.
Conclusions:
- The hybrid reactor is highly effective for nitrobenzene wastewater treatment.
- Optimized operational parameters significantly enhance removal efficiency.
- The system's robustness makes it suitable for industrial wastewater treatment challenges.