Groundwater nitrate contamination: Assessment and treatment using Moringa oleifera Lam. seed extract and activated carbon filtration

The present research evaluates the groundwater nitrate concentration of the Maringá region (Paraná State, Brazil) aiming at nitrate removal by coagulation/flocculation using a natural coagulant obtained from the seeds of the Moringa oleifera Lam. plant (MO) combined with an activated carbon filter....

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Published in:Canadian journal of chemical engineering 2016-04, Vol.94 (4), p.725-732
Main Authors: Rezende, Driano, Nishi, Letícia, Coldebella, Priscila F., Silva, Marcela F., Vieira, Marcelo F., Vieira, Angélica M. S., Bergamasco, Rosângela, Fagundes-Klen, Márcia R.
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Language:English
Subjects:
Activated carbon
activated carbon filter
Brazil
Coagulation
Filtration
Flocculating
Groundwater
Moringa oleifera
Moringa oleifera Lam.
nitrate
Nitrates
Saline
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cited_by cdi_FETCH-LOGICAL-c5202-97ed86558043f5425d1e6e6961daff29aa03270b94a0113e79eaa7d648f5842c3
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container_title Canadian journal of chemical engineering
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creator Rezende, Driano
Nishi, Letícia
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Fagundes-Klen, Márcia R.
description The present research evaluates the groundwater nitrate concentration of the Maringá region (Paraná State, Brazil) aiming at nitrate removal by coagulation/flocculation using a natural coagulant obtained from the seeds of the Moringa oleifera Lam. plant (MO) combined with an activated carbon filter. Groundwater samples were collected in Maringá City metropolitan area and characterized by physicochemical analyses. The results showed groundwater NO3− concentrations ranging from 0–60 mg NO3− L−1. Thus, the nitrate variation in the water used in the coagulation/flocculation assays lay between 10–60 mg · L−1 of NO3−. In these assays both aqueous and saline MO raw extracts were added (concentrations between 0.25–11 g · L−1). Coagulation/flocculation treatment with aqueous MO extract presents nitrate removal of 73.3 %, and saline MO extract presents 85.4 %. The source that presented the highest nitrate concentration along with the ideal MO concentration in the coagulation/flocculation process was used for the coagulation/flocculation process followed by activated carbon filtration. The treatment with MO combined with the filter met Brazilian, American, and international potability standards for nitrate and turbidity. The present study reveals the presence of nitrate in the groundwater of the area and also enables new procedures for treating this kind of water in small rural properties and needy communities.
doi_str_mv 10.1002/cjce.22442
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subjects Activated carbon
activated carbon filter
Brazil
Coagulation
Filtration
Flocculating
Groundwater
Moringa oleifera
Moringa oleifera Lam.
nitrate
Nitrates
Saline
title Groundwater nitrate contamination: Assessment and treatment using Moringa oleifera Lam. seed extract and activated carbon filtration
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