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首页> 外文期刊>Science of the total environment >Performance comparison of constructed wetlands with gravel- and rice husk-based media for phenol and nitrogen removal
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Performance comparison of constructed wetlands with gravel- and rice husk-based media for phenol and nitrogen removal

机译：用砾石和稻壳为基础的人工湿地去除苯酚和氮的性能比较

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摘要

This study aims to compare the performance of planted and implanted constructed wetlands with gravel-and raw rice husk-based media for phenol and nitrogen removal. Four laboratory-scale horizontal subsurface-flow constructed wetland units, two of which planted with cattail (Typho iatifolia) were operated outdoors. The units were operated at a nominal hydraulic retention time of 7 days and fed with domestic wastewater spiked with phenol concentration at 300 mg/L for 74 days and then at 500 mg/L for 198 days. The results show that planted wetland units performed better than the unplanted ones in the removal and mineralization of phenol. This was explained by the creation of more micro-aerobic zones in the root zone of the wetland plants which allow a faster rate of phenol biodegradation, and the phenol uptake by plants. The better performance of the rice husk-based planted wetland compared to that of the gravel-based planted wetland in phenol removal could be explained by the observation that more rhizomes were established in the rice husk-based wetland unit thus creating more micro-aerobic zones for phenol degradation. The role of rice husk as an adsorbent in phenol removal was considered not of importance.
机译：这项研究的目的是比较种植和植入人工湿地与砾石和稻壳基介质去除苯酚和氮的性能。四个实验室规模的水平地下流人工湿地单元，其中两个栽有香蒲（Typho iatifolia）在户外运行。这些设备在标称水力停留时间为7天的条件下运行，并加入浓度为300 mg / L的苯酚浓度为74天，然后以500 mg / L的浓度为198天的生活污水。结果表明，种植的湿地单元在去除和矿化苯酚方面比未种植的单元好。这可以通过在湿地植物的根部创建更多的微需氧区来解释，这可以使苯酚的生物降解速度更快，并使植物吸收苯酚。与基于砾石的人工湿地相比，基于稻壳的人工湿地在去除苯酚方面具有更好的性能，这可以通过以下观察得到解释：在稻壳的湿地单元中建立了更多的根茎，从而产生了更多的微需氧区用于苯酚降解。人们认为稻壳作为吸附剂在去除苯酚中的作用并不重要。

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