Influence of recirculation over COD and N-NH4 removals from landfill leachate by horizontal flow constructed treatment wetland

Autor:	Diederik P.L. Rousseau, Marcelo Antunes Nolasco, Daniele Vital Vich, Piet N.L. Lens, Vitor Cano
Rok vydání:	2019
Předmět:	0106 biological sciences chemistry.chemical_classification Hydraulic retention time biology TRATAMENTO DE ÁGUAS RESIDUÁRIAS Chemical oxygen demand Cyperus papyrus Plant Science 010501 environmental sciences Pulp and paper industry biology.organism_classification 01 natural sciences Pollution chemistry Environmental Chemistry Environmental science Sewage treatment Organic matter Nitrification Leachate Subsurface flow 010606 plant biology & botany 0105 earth and related environmental sciences
Zdroj:	Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP
ISSN:	1549-7879 1522-6514
DOI:	10.1080/15226514.2019.1594681
Popis:	Treatment of landfill leachate is a challenge due to its complex chemical composition and high recalcitrance and because of high costs for conventional wastewater treatment. In our study, leachate from the Quitauna Landfill, Sao Paulo Metropolitan Region, Brazil, was treated at a laboratory scale with a horizontal subsurface flow constructed treatment wetland (HF-CTW) operating under a recirculation regime. Two units planted with Heliconia psittacorum (HP) and Cyperus papyrus (CP), and one unplanted control unit were assessed. With a recirculation regime over 21 days, the planted units removed 40% of chemical oxygen demand (COD) while the control unit removed only 29%. True color removal efficiencies were 2, 22, and 23% for the control, HP, and CP HF-CTWs, respectively. The ammonium nitrogen removal efficiencies for a 21-day hydraulic retention time (HRT) were 63-81% for planted units and 72% for the control. The increase of the HRT from 7 to 21 days led to the enhancement of ammonium nitrogen removal but did not affect the COD and total nitrogen removals. This phenomenon is a consequence of leachate's low biodegradability. The present study shows the importance of the HRT and plant presence for landfill leachate treatment using HF-CTWs.
Databáze:	OpenAIRE
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