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Use of alternative matrix materials and configurations for optimizing nitrogen removal in constructed wetlands

Abstract : The treatment of domestic wastewater by constructed wetlands (CWs) meets, from more than three decades, an increasing interest because of its high treatment efficiency as well as technological, economic and ecological issues. However, with treatment objectives that are growing ever stricter and an increasingly competitive market, fine knowledge of removal processes is required in order to optimize design in regards with context. A particular attention was paid to nitrogen removal, through this study, because of its particularly coercive dimension in treatment process. This work is partitioned in three axes which enable the assessment of the main mechanisms ensuring nitrogen removal (nitrification, denitrification and sorption, respectively). A first part, conducted in pilot-scaled units fed in real domestic wastewater, aimed at identifying the respective effects of various design and operational parameters (filtration height, filtration area, hydraulic and organic loads) in order to provide design recommendations for an efficient removal of ammonium as well as organic matter and suspended solids. A second part of this work, carried out in pilot-scaled units fed with semi-synthetic wastewater, focused on denitrification process in order to highlight driving parameters (influent composition, design and operational parameters) of full nitrate removal. Last but not least, a third research axis, conducted in column-scaled units, assessed the ammonium adsorption onto reactive material (i.e. zeolite) in order to optimize the retention time of ammonium within the system in regards with nitrification kinetic. These results were then summarized in order to provide design guidelines as well as recommend further complementary experiments.
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Submitted on : Tuesday, January 8, 2019 - 3:17:07 PM
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Yoann Millot. Use of alternative matrix materials and configurations for optimizing nitrogen removal in constructed wetlands. Environmental Engineering. Université de Lyon, 2017. English. ⟨NNT : 2017LYSEI021⟩. ⟨tel-01973991⟩

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