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Using oxidation-reduction potential (ORP) and pH value for process control of shortcut nitrification-denitrification
Da-Wen Gao1, Yong-Zhen Peng, Hong Liang
1College of Forest Resources and Environment, Northeast Forestry University, Harbin, China. dawengao@hotmail.com
Summary
A novel, low-cost technology efficiently removes carbon and nitrogen from soybean wastewater using shortcut nitrification-denitrification. Real-time control of aeration and mixing optimizes the process, significantly reducing operational costs and energy consumption.
Area of Science:
- Environmental Engineering
- Wastewater Treatment Technologies
- Biotechnology
Background:
- Soybean wastewater presents challenges for simultaneous carbon and nitrogen removal.
- Conventional methods can be costly and energy-intensive.
Purpose of the Study:
- To develop a low-cost technology for simultaneous carbon and nitrogen removal from soybean wastewater.
- To investigate the efficiency and control parameters of shortcut nitrification-denitrification.
Main Methods:
- Utilized a sequencing batch reactor (SBR) for shortcut nitrification-denitrification.
- Implemented real-time control of aeration and mixing based on oxidation-reduction potential (ORP) and pH.
- Maintained a stable temperature of 28 ± 0.5°C.
Main Results:
- Achieved over 95% average ammonium removal efficiency.
- Reached a nitrosation rate (NO2(-)-N/NOx(-)-N) of 96%.
- Demonstrated that ORP and pH inflection points accurately indicate the end of nitrification and denitrification cycles.
Conclusions:
- The developed shortcut nitrification-denitrification process is efficient and stable for soybean wastewater.
- Real-time ORP and pH monitoring reduces aeration and mixing times, saving energy (up to 40% COD) and lowering operational costs.
- Shorter hydraulic retention times reduce reactor volume and investment costs.