Importance of the Submerged Zone during Dry Periods to Nitrogen Removal in a Bioretention System

He, Kangmao; Qin, Huapeng; Wang, Fan; Ding, Wei; Yin, Yixiang

doi:10.20944/preprints202001.0383.v1

Cited by 5 publications

(1 citation statement)

References 26 publications

(32 reference statements)

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“…The saturated zone is intended to allow high hydraulic conductivity while providing adequate moisture for plant growth and denitrification processes (Kavehei et al 2019). Several studies showed that a saturated zone and/or C source layer, can enhance N removal through denitrification (Dietz and Clausen 2006, He et al 2020, Lee et al 2013, Peterson et al 2015, Wang et al 2018, Zhang et al 2011. A permanently saturated zone at the bottom of a basin is designed to create anaerobic soil conditions to enhance denitrification.…”

Section: Design Implications For Tn Accumulation and Denitrification ...mentioning

confidence: 99%

Soil nitrogen accumulation, denitrification potential, and carbon source tracing in bioretention basins

et al. 2021

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Section: Design Implications For Tn Accumulation and Denitrification ...mentioning

confidence: 99%

Soil nitrogen accumulation, denitrification potential, and carbon source tracing in bioretention basins

et al. 2021

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Response of Nitrogen Removal Performance and Microbial Distribution to Seasonal Shock Nutrients Load in a Lakeshore Multicell Constructed Wetland

Yuan,

Wang,

Hou

et al. 2023

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Multicell constructed wetlands (MCWs) on lakeshores are a prospective treatment technique. However, the factors affecting the nutrient removal performance of lakeshore MCWs at the field scale are unclear. This study chose a field-scale lakeshore MCW with the highest mass removal efficiency (approximately 49,175.12 mg m−2 day−1) for total nitrogen removal in the wet season to investigate the response of nitrogen removal and microbial distribution to seasonal shock nutrients load. The mass loading rates in the wet season were as high as 43~72 times over those in the dry season. Hence, a storage pond (SP), as a forebay retention cell, was necessary to mitigate the shock loads of the influent, which is beneficial to nitrogen removal of the MCW system. The two major genera in the sediments are heterotrophic nitrification–aerobic denitrification bacteria, and the abundance and species of the nitrogen-related functional genera were higher in the wet season than the dry season. According to the results of redundancy analysis, the hydraulic residence time (29.4%, F = 2.2, p < 0.1) and hydraulic loading rate (85.9, F = 36.5, p < 0.05) were the major factors explaining microbial community variation, instead of environmental factors (temperature, pH, and dissolved oxygen). The shock loads of influent and the periodic saturation in sediments contributed to a complicated oxygen and nitrogen nutrient exchange environment resulting in higher abundance and species of nitrogen-related microbes, which is beneficial to nitrogen removal in lakeshore MCWs. The results provided a scientific basis for the optimal design of constructed wetlands on lakeshores.

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The Common Approaches of Nitrogen Removal in Bioretention System

et al. 2021

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Bioretention is considered one of the best management practices (BMPS) for managing stormwater quality and quantity. The bioretention system has proven good performance in removing total suspended solids, oil, and heavy metals. The nitrogen (N) removal efficiency of the bioretention system is insufficient, however, due to the complex forms of nitrogen. Therefore, this paper aims to review recent enhancement approaches to nitrogen (N) removal and to discuss the factors influencing bioretention efficiency. To improve bioretention efficiency, several factors should be considered when designing bioretention systems, including nitrogen concentration, climate factors, and hydrological factors. Further, soil and plant selection should be appropriate for environmental conditions. Three design improvement approaches have been reviewed. The first is the inclusion of a saturated zone (SZ), which has been used widely. The SZ is shown to have the best performance in nitrogen removal. The second approach (which is less popular) is the usage of additives in the form of a mixture with soil media or as a separated layer. This concept is intended to be applied in tropical regions with wet soil conditions and a short dry period. The third approach combines the previous two approaches (enhanced filter media and applying a SZ). This approach is more efficient and has recently attracted more attention. This study suggests that further studies on the third approach should be carried out. Applying amendment material through filter media and integrating it with SZ provides appropriate conditions to complete the nitrogen cycle. This approach is considered a promising method to enhance nitrogen removal. In general, the bioretention system offers a promising tool for improving stormwater quality.

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Importance of the Submerged Zone during Dry Periods to Nitrogen Removal in a Bioretention System

Cited by 5 publications

References 26 publications

Soil nitrogen accumulation, denitrification potential, and carbon source tracing in bioretention basins

Soil nitrogen accumulation, denitrification potential, and carbon source tracing in bioretention basins

Response of Nitrogen Removal Performance and Microbial Distribution to Seasonal Shock Nutrients Load in a Lakeshore Multicell Constructed Wetland

The Common Approaches of Nitrogen Removal in Bioretention System

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