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A model for the simulation of the SHARON process: pH as a key factor
A Magrí1, L Corominas, H López
1GIRO Technological Centre, Rambla Pompeu Fabra 1, E-08100 Mollet del Vallès, Barcelona, Spain.
Environmental Technology
|April 17, 2007
Summary
The SHARON process, when modeled with pH control and Haldane kinetics, offers a sustainable approach to wastewater nitrogen removal. This mathematical model confirms effluent quality is highly pH-dependent.
Area of Science:
- Environmental Engineering
- Biotechnology
- Wastewater Treatment
Background:
- Conventional nitrification-denitrification for wastewater nitrogen removal is energy-intensive.
- The SHARON (Single reactor for High activity Ammonium REjection) process coupled with Anammox offers a more sustainable alternative.
- Controlling pH is critical in partial nitrification due to its impact on substrate availability and microbial inhibition.
Purpose of the Study:
- To develop and present a mathematical model for a continuously aerated SHARON reactor.
- To investigate the influence of pH on the SHARON process, including substrate availability and inhibition.
- To incorporate Haldane kinetics to account for substrate inhibition of ammonium- and nitrite-oxidizing bacteria.
Main Methods:
- Development of a mathematical model for a continuously aerated SHARON reactor.
- Implementation of a pH calculation algorithm to manage process conditions.
- Application of Haldane kinetics to model substrate inhibition for both nitrification steps.
- Validation of the model using historical experimental data from a lab-scale SHARON reactor with synthetic substrate.
Main Results:
- The developed mathematical model accurately describes the SHARON process.
- The model highlights the significant impact of pH on the efficiency of nitrogen removal.
- Haldane kinetics effectively captured the substrate inhibition phenomena observed in the nitrification steps.
- Model evaluation using experimental data corroborated the strong dependence of effluent quality on pH.
Conclusions:
- The SHARON process, when accurately modeled with pH control and appropriate kinetics, is a viable sustainable technology for wastewater nitrogen removal.
- Mathematical modeling provides valuable insights into optimizing SHARON reactor performance.
- Precise pH management is essential for achieving high-quality effluent in the SHARON process.
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