Zhang,M., Lawlor,P.G., Li,J. and Zhan,X.(2012): Characteristics of nitrous oxide (N2O) emissions from intermittently-aerated sequencing batch reactors treating the separated liquid fraction of anaerobically digested pig manure. Water Air Soil Pollut., 223, 1973-1981.

『嫌気的に温浸した豚肥やしの分離した液体画分を扱う断続−通気連続バッチ反応器からの亜酸化窒素（N2O）排出の特徴』

『Abstract
　In this study, the N2O 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 (COP) concentrations of 11,540±869 mg l-1, 5-day biochemical oxygen demand (BOD5) concentrations of 2,900±200 mg l-1 and total nitrogen concentrations of 4,041±59 mg l-1, with low COP:N ratios (2.9, on average) and BOD5:N ratios (0.72, on average). Synthetic wastewater, simulating the SLAP with similar COP and nitrogen concentrations but with higher BOD5 concentrations of up to 11,500±100 mg l-1, was treated in another identical reactor (IASBR-2) to compare the effects of carbon source on nutrient removals and N2O emissions. In steady-state, soluble N2O accumulated in the non-aeration periods, with the highest N2O concentrations measured at the end of the non-aeration periods. There was a significant reduction in N2O concentrations during the aeration periods with reductions occurring immediately on commencement of aeration. The mean N2O 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 N2O emissions occurred in IASBR-1 and IASBR-2, respectively; while during the aeration periods, 91.7％ and 91.6％ of N2O emissions rook place in IASBR-a and IASBR-2, respectively. The mean specific N2O generation rates were 0.010 and 0.005 mg (g VSS・min)-1 in the aeration periods, 0.024 and 0.021 mg (g VSS・min)-1 in the non-aeration periods for IASBR-1 and IASBR-2, respectively. Mean nitrogen removal via N2O emissions was 15.6％ and 10.1％ for IASBR-1 and IASBR-2, respectively. The IASBR-1 with low influent BOD5 concentrations emitted and generated more N2O.

Keywords: Anaerobic digestion; Intermittently aerated sequencing batch reactor; Nitrite; Nitrous oxide; Pig manure』

1. Introduction
2. Materials and methods
　2.1. Intermittently aerated sequencing batch reactors
　2.2. SLAP and the synthetic wastewater
　2.3. Analytical methods
3. Results and discussion
　3.1. N2O emissions and generation in IASBRs
　3.2. Nitrogen balance
4. Conclusions
Acknowledgements
References

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