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- Title
Improving Nitrogen Removal in Two Modified Decentralized Wastewater Systems.
- Authors
Zhihua Liang; Huy Quang Nguyen; Atreyee Das; Zhiqiang Hu
- Abstract
Efficient nutrient removal in decentralized waStewater treatment systems is a challenging task. To improve the removal of organic matter and nitrogen from wastewater, two types of bioreactors using membrane-aerated biofilm reactor (MABR) and microbial fuel cell (MFC) techniques were evaluated. During more than 250 days of continuous-flow reactor operation, both reactors showed consistently high chemical oxygen demand removal (>86%). At an influent ammonium-nitrogen (NH4+-N) concentration of 30 mg NIL, the average effluent NH4+-N concentrations were 6.2 and 0.5 mg NIL for the MABR and MFC reactor, respectively, while the effluent nitrate-nitrogen (NO3--N) Concentrations were 5.4 mg/L in the MABR and 19.2 mg/L in the MFC-based reactor. The overall total inorganic nitrogen removal efficiencies were 64% and 36% for the MABR and MFC reactor, respectively. At the measured dissolved oxygen concentrations of 5.2 and 0.23 mg/L in the aerobic/anoxic zone of the MFC and MABR, respectively, a specific oxygen uptake rate of 0.1 g O2/g VSSd, resulting from ammonia oxidation, was detected in the settled sludge of the MFC, while no nitrifying activity of the sludge from the MABR was detected. Molecular microbial analysis demonstrated a link between the bacterial community structure and nitrifying activity. The relatively high abundance of Nitrosomonas europaea was associated with its detectable nitrification activity in the settled sludge of the MFC. The results suggest that MABR and MFC techniques have the potential to improve organic and nitrogen removal in decentralized wastewater systems. Water Environ. Res., 83, 722 (2011).
- Subjects
WASTEWATER treatment; SEWAGE purification; WATER quality management; NITROGEN removal (Water purification); WATER purification
- Publication
Water Environment Research (10614303), 2011, Vol 83, Issue 8, p722
- ISSN
1061-4303
- Publication type
Article
- DOI
10.2175/106143011X12928814444691