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A novel double-membrane system for simultaneous nitrification and denitrification in a single tank
1Graduate Institute of Environmental Engineering, National Taiwan University, Taipei, Republic of China. d4541006@ms.cc.ntu.edu.tw
Letters in Applied Microbiology
|July 2, 1999
Summary
A new biological treatment system enables simultaneous nitrification and denitrification in one tank. This innovative approach uses membrane modules to create separate environments for nitrifying and denitrifying bacteria, improving nitrogen removal efficiency.
Area of Science:
- Environmental Engineering
- Microbiology
- Water Treatment
Background:
- Simultaneous nitrification and denitrification (SND) is crucial for efficient wastewater treatment.
- Traditional methods face challenges with interferences between nitrification and denitrification processes.
- Developing integrated systems for SND is an ongoing area of research.
Purpose of the Study:
- To develop and evaluate a novel biological treatment system for simultaneous nitrification and denitrification.
- To overcome the interference between nitrification and denitrification in a single reactor.
- To enhance nitrogen removal rates and reduce operational costs.
Main Methods:
- A single-tank system incorporating two types of membrane modules was designed.
- Silicone tubes within membrane modules facilitated substrate diffusion to biofilms.
- One module was supplied with methanol for denitrification; the other with pure oxygen for nitrification.
Main Results:
- The diffusion barriers (biofilms) effectively prevented interference between nitrification and denitrification.
- Two distinct microbial niches for nitrifiers and denitrifiers coexisted within the single tank.
- The system achieved high nitrogen removal rates (2.9-3.4 gN m-2 d-1) and low residual chemical oxygen demand (COD).
Conclusions:
- The developed membrane-based system is effective for simultaneous nitrification and denitrification.
- This approach saves space and alkalinity while enhancing treatment efficiency.
- The system offers a promising solution for advanced wastewater nitrogen removal.