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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Nitrification in multistage horizontal flow treatment wetlands for landfill leachate treatment

Texto completo
Cano, Vitor [1] ; Vich, Daniele V. [1, 2] ; Andrade, Helisson H. B. [1] ; Salinas, Delhi T. P. [1] ; Nolasco, Marcelo A. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Sch Arts Sci & Humanities, Ave Arlindo Bettio 1000, BR-01382800 Sao Paulo, SP - Brazil
[2] Univ Fed Alagoas, Ctr Technol, BR-57072900 Maceio, AL - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Science of The Total Environment; v. 704, FEB 20 2020.
Citações Web of Science: 0

One of the key challenges in landfill leachate treatment is removing organic matter (OM) and ammonium nitrogen (NH4+-N) at a low cost. To evaluate the feasibility of treatment wetlands for diluted (3:10) landfill leachate treatment with OM and NH4+-N oxidation, a lab-scale shallow subsurface horizontal flow system (HF wetland) comprised of two units operated in series was assessed as post-treatment of partial ammonia stripping system. A HF wetland planted with Heliconia psittacorum (HP) and an unplanted HF wetland (control) were supplemented with micronutrients and monitored under the influence of hydraulic retention time (HRT), pH, and the plant presence on performance. With an HRT above 4 days, mean chemical oxygen demand removal for both HP and the control was less than 20%, without complete mineralization, probably due to the recalcitrance of OM. For NH4+-N, the mean global removal efficiencies with and without influent pH adjustment were, respectively, 74% and 54% for HP and 56% and 43% for the control, resulting in mean concentrations between 36 and 93 mg L-1. The NH4+-N removal was correlated with inorganic carbon consumption followed by NO3 production, which suggests that nitrification was the major route of removal. For both systems, nitrification was significantly higher in one of the units, when biodegradable OM was already consumed and competition between heterotrophic and autotrophic bacteria for dissolved oxygen was likely minimized. By balancing the organic load and availability of dissolved oxygen within each unit in series, a reduced HRT necessary for NH4+-N oxidation was achieved, an essential aspect for the design of high performance constructed wetlands for full scale landfill leachate treatment. (C) 2019 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 10/00851-2 - Implantação e monitoramento de um sistema de tratamento de efluentes por wetlands construídos visando o reuso de água
Beneficiário:Vitor Cano
Modalidade de apoio: Bolsas no Brasil - Iniciação Científica