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Future perspectives in bioreactor development
R Mulder1, T L Vereijken, C T Frijters
1PAQUES Water Systems BV, Balk, The Netherlands. R.Mulder@Paques.nl
Summary
Optimizing wastewater treatment, this study explores enhancing conversion capacities in anaerobic and aerobic systems. Innovations like granulation and fluidised beds boost efficiency, with further potential in specialized reactors and the grazing concept for aerobic treatment.
Area of Science:
- Environmental Science
- Biotechnology
- Chemical Engineering
Background:
- Wastewater treatment systems, both anaerobic and aerobic, face challenges in maximizing conversion capacities.
- Modern anaerobic high-rate reactors effectively exploit conversion potentials, unlike aerobic systems operating at low biomass growth, which limits loading rates.
- Increasing industrial effluent concentrations (COD, salt) necessitate advanced treatment solutions.
Purpose of the Study:
- To analyze the conversion capacities of anaerobic and aerobic wastewater treatment systems.
- To evaluate the impact of growth kinetics, hydrodynamics, and biomass concentration on system performance.
- To identify areas for improvement and future development in wastewater treatment technologies.
Main Methods:
- Comparative analysis of anaerobic and aerobic wastewater treatment systems.
- Examination of granulation and fluidised bed technologies for enhanced conversion.
- Review of novel concepts such as the SBR with granular biomass and the grazing concept.
- Assessment of psychrophilic and thermophilic anaerobic treatment reactor development.
- Evaluation of membrane bioreactors and their limitations.
Main Results:
- High-rate anaerobic reactors currently achieve optimal conversion potentials.
- Granulation and fluidised bed systems significantly enhance conversion capacities in both anaerobic and aerobic processes.
- The grazing concept presents a promising avenue for improving aerobic system performance.
- Specific reactor developments can further boost volumetric conversion in specialized anaerobic treatments.
- Membrane bioreactors have niche applications but suffer from poor oxygen transfer economy.
Conclusions:
- Significant advancements have been made in anaerobic and aerobic wastewater treatment, particularly through granulation and fluidised beds.
- Further research is needed to optimize aerobic systems, potentially through concepts like grazing.
- Development of anaerobic reactors capable of retaining flocculant biomass is crucial for treating concentrated industrial effluents.
- A deeper understanding of membrane bioreactor technology is required to address its limitations, especially oxygen transfer efficiency.