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Partial nitrification in a sequencing batch reactor treating acrylic fiber wastewater
Jin Li1, Deshuang Yu, Peiyu Zhang
1School of Chemical and Environmental Engineering, Qingdao University, Qingdao, People's Republic of China. ljin0532@126.com
Biodegradation
|October 12, 2012
Summary
Partial nitrification in acrylic fiber wastewater treatment was achieved by controlling temperature and pH. Optimal conditions favored ammonium oxidizing bacteria (AOB) over nitrite oxidizing bacteria (NOB), leading to high nitrite accumulation.
Area of Science:
- Environmental Science
- Microbiology
- Chemical Engineering
Background:
- Acrylic fiber wastewater poses environmental challenges due to its composition.
- Wastewater treatment often involves complex biological processes like nitrification.
- Controlling nitrification is crucial for nitrogen removal and preventing eutrophication.
Purpose of the Study:
- To investigate the feasibility of partial nitrification for treating acrylic fiber wastewater.
- To identify optimal operational parameters for selective ammonium oxidizing bacteria (AOB) growth.
- To understand the influence of temperature, pH, and hydraulic retention time (HRT) on nitrification efficiency.
Main Methods:
- Utilized a sequencing batch reactor (SBR) for acrylic fiber wastewater treatment.
- Controlled operational parameters including dissolved oxygen, mixed liquor suspended solids, temperature, pH, and HRT.
- Monitored the populations of ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) under different conditions.
Main Results:
- Partial nitrification was successfully achieved at 28°C, with optimal nitrite-N accumulation of 82% at pH 8.5.
- High pH and free ammonia concentrations inhibited nitrite oxidizing bacteria (NOB) growth.
- An optimal HRT of 20 hours was determined for efficient nitrite-N buildup, promoting AOB dominance and NOB washout.
Conclusions:
- Partial nitrification is a viable strategy for treating acrylic fiber wastewater.
- Optimized conditions (28°C, pH 8.5, 20h HRT) selectively promote AOB over NOB.
- This approach effectively prevents nitrite to nitrate conversion, enhancing nitrogen removal efficiency.
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