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Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge
Published on: September 26, 2016
Operational strategies for nitrogen removal in granular sequencing batch reactor.
Fang-yuan Chen1, Yong-Qiang Liu, Joo-Hwa Tay
1College of Environmental Science and Engineering, Kunming University of Science and Technology, 282 Xuefu Road, Kunming 650093, PR China.
Aerobic granules effectively remove total inorganic nitrogen (TIN) in sequencing batch reactors. A novel strategy combining anoxic/oxic conditions with step-feeding optimizes TIN removal, achieving over 95% efficiency.
Area of Science:
- Environmental Science
- Microbiology
- Chemical Engineering
Background:
- Aerobic granular sludge is a key technology for wastewater treatment.
- Optimizing operational strategies is crucial for enhancing nitrogen removal efficiency.
Purpose of the Study:
- To investigate the impact of different operational strategies on nitrogen removal by aerobic granules of varying sizes.
- To identify the optimal strategy for maximizing total inorganic nitrogen (TIN) removal.
Main Methods:
- Utilized sequencing batch reactors (SBRs) with aerobic granules (1.5mm and 0.7mm).
- Compared alternating anoxic/oxic (AO) mode with and without dissolved oxygen (DO) control.
- Developed and tested a novel AO strategy combined with step-feeding.
Main Results:
- Standard AO mode achieved 67.8-71.5% TIN removal.
- AO mode with controlled DO (2mg/l) improved TIN removal to 75.0-80.4%.
- The novel AO strategy with step-feeding achieved superior TIN removal of 93.0-95.9%.
Conclusions:
- The alternating anoxic/oxic strategy combined with step-feeding is the optimal method for TIN removal by granular sludge.
- This optimal strategy's effectiveness is independent of aerobic granule size.
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