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- Title
Characteristics of Nitrous Oxide (NO) Emissions from Intermittently-Aerated Sequencing Batch Reactors Treating the Separated Liquid Fraction of Anaerobically Digested Pig Manure.
- Authors
Zhang, Mingchuan; Lawlor, Peadar; Li, Jianping; Zhan, Xinmin
- Abstract
In this study, the NO emission from an intermittently aerated sequencing batch reactor (IASBR-1) treating the separated liquid fraction of anaerobically digested pig manure (SLAP) was investigated. The wastewater had chemical oxygen demand (COD) concentrations of 11,540 ± 860 mg l, 5-day biochemical oxygen demand (BOD) concentrations of 2,900 ± 200 mg land total nitrogen concentrations of 4,041 ± 59 mg l, with low COD:N ratios (2.9, on average) and BOD:N ratios (0.72, on average). Synthetic wastewater, simulating the SLAP with similar COD and nitrogen concentrations but with higher BOD concentrations of up to 11,500 ± 100 mg l, was treated in another identical reactor (IASBR-2) to compare the effects of carbon source on nutrient removals and NO emissions. In steady-state, soluble NO accumulated in the non-aeration periods, with the highest NO concentrations measured at the end of the non-aeration periods. There was a significant reduction in NO concentrations during the aeration periods with reductions occurring immediately on commencement of aeration. The mean NO emissions in an operational cycle were 253.6 and 205.3 mg for IASBR-1 and IASBR-2, respectively. During the non-aeration periods, only 8.3% and 8.4% of total NO emissions occurred in IASBR-1 and IASBR-2, respectively; while during the aeration periods, 91.7% and 91.6% of NO emissions took place in IASBR-1 and IASBR-2, respectively. The mean specific NO generation rates were 0.010 and 0.005 mg (g VSS·min) in the aeration periods, 0.024 and 0.021 mg (g VSS·min) in the non-aeration periods for IASBR-1 and IABSR-2, respectively. Mean nitrogen removal via NO emissions was 15.6% and 10.1% for IASBR-1 and IASBR-2, respectively. The IASBR-1 with low influent BOD concentrations emitted and generated more NO.
- Subjects
NITROUS oxide; EMISSIONS (Air pollution); SWINE manure; ANAEROBIC digestion; NITRITES
- Publication
Water, Air & Soil Pollution, 2012, Vol 223, Issue 5, p1973
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-011-0998-z