Aerated membrane-attached biofilm reactor as an effective tool for partial nitrification in pretreatment of anaerobic ammonium oxidation (ANAMMOX) process
✍ Scribed by Yu-Jou Feng; Szu-Kung Tseng; Tsung-Hui Hsia; Chun-Ming Ho; Wen-Po Chou
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2007
- Tongue
- English
- Weight
- 470 KB
- Volume
- 83
- Category
- Article
- ISSN
- 0268-2575
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
BACKGROUND: A laboratory‐scale membrane aeration bioreactor was employed to treat synthetic ammonium‐rich wastewater to yield an appropriate NH~4~^+^/NO~2~^−^ ratio for anaerobic ammonium oxidation (ANAMMOX). The main objectives of this study were to steadily obtain 50% partial nitrification in batch experiments, to evaluate the effects of aeration and to identify the dominant bacterial community of the biofilm for partial nitrification.
RESULTS: Some of the ammonium in the synthetic wastewater was partially nitrified. A suitable NH~4~^+^/NO~2~^−^ ratio (1:1 to 1:1.3) for the ANAMMOX process was obtained after 24 h. The dissolved oxygen (DO) level in the treated water was very low (below 0.6 mg L^−1^). Both the appropriate NH~4~^+^/NO~2~^−^ ratio and the low DO level make this bioreactor an ideal pretreatment system for ANAMMOX. In addition, a molecular biotechnology method was applied to prove that the ammonia‐oxidizing bacteria dominated the biofilm.
CONCLUSION: This system achieved surprising cost savings in the aeration process compared with traditional aeration systems. The combination of this system with the subsequent ANAMMOX process has great potential as a favorable short‐cut in the treatment of ammonium‐rich wastewater. Copyright © 2007 Society of Chemical Industry