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Energy-Efficient Single-Stage Nitrite Shunt Denitrification with Saline Sewage through Concise Dissolved Oxygen (DO)
Huichuan Zhuang1, Zhuoying Wu2, Linji Xu3
1Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Microorganisms
|June 24, 2020
Summary
Optimizing low dissolved oxygen (DO) levels is key for efficient single-stage nitrite shunt denitrification in saline sewage treatment. This method offers energy savings and effective removal of total nitrogen (TN) and chemical oxygen demand (COD).
Area of Science:
- Environmental Microbiology
- Wastewater Treatment Engineering
- Biotechnology
Background:
- Single-stage nitrite shunt denitrification offers energy-efficient wastewater treatment with reduced footprint and C/N ratio requirements.
- Optimizing dissolved oxygen (DO) levels is crucial for enhancing denitrification efficiency while inhibiting nitrite oxidation.
Purpose of the Study:
- To investigate the optimal dissolved oxygen (DO) level and temperature for single-stage nitrite shunt denitrification in saline sewage.
- To analyze the microbial community structure and its correlation with nitrogen and chemical oxygen demand (COD) removal efficiency.
Main Methods:
- Experimental investigation of saline sewage treatment under varying DO levels and temperatures with fixed hydraulic and solids retention times.
- 16S rRNA gene sequencing for microbial community analysis.
- Canonical Correspondence Analysis (CCA) and Tax4Fun for microbial functionality assessment.
Main Results:
- Optimal conditions of 0.3 mg/L DO at 20 °C achieved over 60.7% total nitrogen (TN) and 97.9% COD removal.
- Significant abundance of sulfur-reducing, nitrogen-fixing, ammonia-oxidizing, nitrite-oxidizing, and denitrifying bacteria were observed.
- DO was identified as a pivotal factor influencing microbial community structure and denitrification performance.
Conclusions:
- Low DO levels are critical for effective single-stage nitrite shunt denitrification, promoting efficient TN and COD removal in saline wastewater.
- The study elucidated the interplay between operating conditions (DO, temperature) and microbial community dynamics for optimized treatment.
- Dissolved oxygen is a key factor in managing microbial communities for energy-efficient saline sewage treatment.
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