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IDENTIFICATION OF NITROUS OXIDE GENERATION IN SUBSURFACE WASTEWATER INFILTRATION SYSTEM FILLED WITH MIXED MATRIX
Journal of Environmental Engineering and Landscape Management ( IF 1.3 ) Pub Date : 2020-04-09 , DOI: 10.3846/jeelm.2020.12073
Ying-Hua Li 1 , Lei Yang 1 , Hai-Bo Li 1 , Si-Qi Wang 1 , Fei Su 1
Affiliation  

Subsurface wastewater infiltration systems (SWIS) are one of the important sources of nitrous oxide (N2O) production; understanding the biological processes and contributions of N2O will help control the amount of N2O produced. To quantitatively reveal the contribution of nitrification and denitrifiaction processes, 8 g potassium nitrate with 99.99 atom % 15N (i.e. 15N accounts for 99.99% of the total N) was dissolved in the influent (concentration: 3.3 g/L). Results showed that nitrification released more N2O within 0–12 h, accounting for 79.6 ± 2.4%. The denitrification process accounted for 88.5 ± 1.3% for N2O generation after the 12th hour. Thus, in order to effectively control the release of N2O, the denitrification process should be given more attention. The maximum release rate of N2O was 8.45 ± 0.8 mg/m2·h, which occurred near the end of the first wetting-drying cycle. Since then, peaks appeared periodically, mostly in the “rest” periods.

中文翻译:

填充混合基质的地下废水渗透系统中一氧化二氮生成的识别

地下废水渗透系统 (SWIS) 是一氧化二氮 (N2O) 产生的重要来源之一;了解 N2O 的生物过程和贡献将有助于控制 N2O 的产生量。为了定量揭示硝化和反硝化过程的贡献,在进水中溶解了 8 g 硝酸钾,其中 15N 原子百分比为 99.99%(即 15N 占总 N 的 99.99%)(浓度:3.3 g/L)。结果表明,硝化作用在 0-12 小时内释放出更多的 N2O,占 79.6±2.4%。反硝化过程占第 12 小时后 N2O 生成的 88.5±1.3%。因此,为了有效控制N2O的排放,应更加重视反硝化过程。N2O的最大释放率为8.45±0.8mg/m2·h,这发生在第一个干湿循环快要结束的时候。从那以后,高峰周期性地出现,主要是在“休息”期间。
更新日期:2020-04-09
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