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首页> 外文期刊>Environmental Science & Technology >Inside Story of Gas Processes within Stormwater Biofilters: Does Greenhouse Gas Production Tarnish the Benefits of Nitrogen Removal?
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Inside Story of Gas Processes within Stormwater Biofilters: Does Greenhouse Gas Production Tarnish the Benefits of Nitrogen Removal?

机译：雨水生物过滤器内气体过程的内幕：温室气体生产是否会损害脱氮的利益？

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摘要

Stormwater biofilters are dynamic environments, supporting diverse processes that act to capture and transform incoming pollutants. However, beneficial water treatment processes can be accompanied by undesirable greenhouse gas production. This study investigated the potential for nitrous oxide (N_2O) and methane (CH-4) generation in dissolved form at the base of laboratory-scale stormwater biofilter columns. The influence of plant presence, species, inflow frequency, and inclusion of a saturated zone and carbon source were studied. Free-draining biofilters remained aerobic with negligible greenhouse gas production during storm events. Designs with a saturated zone were oxygenated at their base by incoming stormwater before anaerobic conditions rapidly re-established, although extended dry periods allowed the reintroduction of oxygen by evapotranspiration. Production of CH-4 and N-2O in the saturated zone varied significantly in response to plant presence, species, and wetting and drying. Concentrations of N_2O typically peaked rapidly following stormwater inundation, associated with limited plant root systems and poorer nitrogen removal from biofilter effluent. Production of CH_4 also commenced quickly but continued throughout the anaerobic interevent period and lacked clear relationships with plant characteristics or nitrogen removal performance. Dissolved greenhouse gas concentrations were highly variable, but peak concentrations of N_2O accounted for <1.5% of the incoming total nitrogen load. While further work is required to measure surface emissions, the potential for substantial release of N_2O or CH_4 in biofilter effluent appears relatively low.
机译：雨水生物过滤器是动态的环境，支持各种过程来捕获和转化传入的污染物。但是，有益的水处理过程可能伴随着不良的温室气体产生。这项研究调查了在实验室规模的雨水生物滤池柱的底部以溶解形式产生一氧化二氮（N_2O）和甲烷（CH-4）的潜力。研究了植物的存在，种类，流入频率以及饱和区和碳源的夹杂物的影响。在暴风雨期间，自由排水的生物滤池保持好氧状态，产生的温室气体可忽略不计。在快速恢复厌氧条件之前，带有饱和区的设计在进入的雨水基础上被氧饱和，尽管延长的干燥时间允许通过蒸散作用重新引入氧气。饱和区中CH-4和N-2O的产生响应于植物的存在，种类以及湿润和干燥而发生显着变化。 N_2O的浓度通常在雨水泛滥后迅速达到峰值，这与有限的植物根系和较弱的生物滤池污水脱氮能力有关。 CH_4的生产也很快开始，但在整个厌氧期间一直持续生产，并且与植物特性或脱氮性能缺乏明确的关系。溶解的温室气体浓度变化很大，但N_2O的峰值浓度不到输入的总氮负荷的1.5％。虽然需要进一步的工作来测量表面排放物，但生物滤池中的N_2O或CH_4大量释放的可能性似乎相对较低。

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  • 来源
    《Environmental Science & Technology》 |2017年第7期|3703-3713|共11页
  • 作者

    Emily G. I. Payne; Tracey Pham; Perran L. M. Cook; Ana Deletic; Belinda E. Hatt; Tim D. Fletcher;

  • 作者单位

    Department of Civil Engineering, School of Chemistry, Monash University, Clayton, Victoria, Australia 3800;

    Department of Civil Engineering, School of Chemistry, Monash University, Clayton, Victoria, Australia 3800;

    Water Studies Centre, School of Chemistry, Monash University, Clayton, Victoria, Australia 3800;

    Department of Civil Engineering, School of Chemistry, Monash University, Clayton, Victoria, Australia 3800;

    Department of Civil Engineering, School of Chemistry, Monash University, Clayton, Victoria, Australia 3800;

    Department of Civil Engineering, School of Chemistry, Monash University, Clayton, Victoria, Australia 3800;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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