[Pilot Study on Start-up and Stable Operation at Low Temperature Based on Denitrifying Phosphorus Removal]
Fan Zhang1, De-Shuang Yu1, Jie Liu2
1School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China.
Huan Jing Ke Xue= Huanjing Kexue
|December 20, 2019
Summary
A modified University of Cape Town (UCT) process effectively removes nitrogen and phosphorus at low temperatures (6-16°C). The system achieved high removal rates, meeting stringent discharge standards for urban wastewater treatment.
Area of Science:
- Environmental Microbiology
- Wastewater Treatment Engineering
Context:
- Low-temperature wastewater treatment presents challenges for biological nutrient removal processes.
- Denitrifying phosphate-accumulating organisms (DPAOs) offer potential for simultaneous nitrogen and phosphorus removal.
Purpose:
- To investigate the nitrogen and phosphorus removal characteristics of DPAOs using a modified UCT process at low temperatures (6-16°C).
- To evaluate the performance of the modified UCT process under varying operational conditions, including reflux ratio.
Summary:
- A pilot-scale (20 m³) modified UCT process was successfully operated at 6-16°C with HRT of 20 h and SRT of 35 days.
- Stable operation achieved 60%±5% nitrogen and 80%±5% phosphorus removal, meeting GB 18918-2002 standards.
- Increasing the reflux ratio to 150% enhanced removal rates to 80%±10% for nitrogen and 90%±5% for phosphorus, with anoxic denitrification contributing significantly to phosphorus removal.
Impact:
- Demonstrates the feasibility of the modified UCT process for efficient nutrient removal in cold climates.
- Provides optimized operational parameters for enhanced nitrogen and phosphorus removal.
- Contributes to meeting stricter wastewater discharge standards and improving water quality.
