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首页> 外文期刊>Environmental earth sciences >Reactive ditches: A simple approach to implement denitrifying wood chip bioreactors to reduce nitrate exports into aquatic ecosystems?
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Reactive ditches: A simple approach to implement denitrifying wood chip bioreactors to reduce nitrate exports into aquatic ecosystems?

机译：反应性沟渠：实施木屑生物反应器反硝化以减少硝酸盐向水生生态系统出口的简单方法？

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摘要

Despite intensive efforts motivated by the European Water Framework Directive, many water bodies still suffer from poor water quality in Germany. Intensively drained agricultural areas are still a critical source for nitrate which is responsible for negative effects on aquatic ecosystems. Basic measures such as the fertiliser ordinance are expected to be not sufficient to completely eliminate nitrate exports via drainage tiles and ditches. Consequently, there is the demand to manage the reduction of nitrate concentrations with new additional end of pipe solutions. For this, the presented study focuses on a simply to implement reactive ditch for denitrification, which is installed into drainage ditches to reduce nitrate concentrations. An existing drainage ditch that is fed by tile drainage water was filled with wood chips to keep installation efforts as simple and cheap as possible. In situ parameters and nutrient concentrations were determined at the inflow and the outflow of the reactive ditch for 2 years. The results reveal a promising potential for wood chip-based filters to reduce nitrate concentrations by 28 % on average over all seasons. Within the filter, favourable conditions for denitrification were predominantly found without flooding of surrounding areas. Investigations revealed decreasing nitrate concentrations especially in cases of low flow rates and high temperatures. These encouraging results demonstrate the successful application of reactive ditches under German lowland conditions in general. Since tile drainages are installed for many agricultural areas in this region, there seems to be high potential for the application of this easily implementable type of bioreactor.
机译：尽管受到《欧洲水框架指令》的推动而付出了巨大的努力，但德国的许多水体仍遭受水质差的困扰。集约化农业区仍然是硝酸盐的重要来源，硝酸盐对水生生态系统造成负面影响。预计诸如肥料条例之类的基本措施不足以完全消除通过排水瓦和沟渠排放的硝酸盐。因此，需要用新的额外的管道末端解决方案来控制硝酸盐浓度的降低。为此，本研究集中于简单地实施反应性沟渠进行反硝化，该沟渠安装在排水沟中以降低硝酸盐浓度。用瓷砖排水给现有的排水沟填充木屑，以使安装工作尽可能简单，便宜。在2年内，在反应沟的入水口和出水口确定原位参数和养分浓度。结果表明，基于木屑的过滤器有望在所有季节内平均降低28％的硝酸盐浓度。在过滤器内，主要发现了反硝化的有利条件，而不会淹没周围区域。调查显示硝酸盐浓度降低，特别是在低流速和高温的情况下。这些令人鼓舞的结果表明，反应性沟渠通常在德国低地条件下成功应用。由于该地区的许多农业地区都安装了瓷砖排水装置，因此这种易于实施的生物反应器的应用潜力很大。

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