Publication
The use of Moringa oleifera as a natural coagulant in surface water treatment
| dc.contributor.author | Camacho, Franciele Pereira | |
| dc.contributor.author | Sousa, Vania Serrao | |
| dc.contributor.author | Bergamasco, Rosangela | |
| dc.contributor.author | Teixeira, Margarida Ribau | |
| dc.date.accessioned | 2019-11-20T15:07:43Z | |
| dc.date.available | 2019-11-20T15:07:43Z | |
| dc.date.issued | 2017-04 | |
| dc.description.abstract | Moringa oleifera (MO) seed is a natural plant with active bio-coagulate compounds that can be used for water clarification since it reduces the use of chemical-based coagulants. This study aims to evaluate the impact of Moringa oleifera (MO) seeds and MO seeds with a reduced amount of oil as coagulants in conventional water treatment to remove cyanobacteria from different natural surface waters. Tests were performed for waters with low (5-10 NTU) and high (30-60 NTU) initial turbidity with and without Microcystis aeruginosa cells and for MO integral powder, MO oil-extracted with ethanol and with a pressurized technique, and MO extracted with NaCI. The results show that MO oil-extraction is not necessary when using MO seeds as a coagulant in coagulation/flocculation/sedimentation (CF/S). Chlorophyll a and turbidity removals were up to 85% for high-turbidity waters, with 50 mg.L-1 MO obtained, for MO integral powder and for all of the MO extraction methods used. Therefore, for these waters, integral powder (without any extraction) can be used. For low-turbidity waters and using a 1 M saline extraction of the active coagulant compound, chlorophyll a and turbidity removals were approximately 60%. It was also demonstrated that MO is capable of removing some of the organic matter present in water, namely, aromatic organic matter, between 40 and 50% when using MO extracted with NaCI. However, dissolved organic matter results showed an increase independent of the type of MO extraction used. (C) 2016 Elsevier B.V. All rights reserved. | |
| dc.description.version | info:eu-repo/semantics/publishedVersion | |
| dc.identifier.doi | 10.1016/j.cej.2016.12.031 | |
| dc.identifier.issn | 1385-8947 | |
| dc.identifier.issn | 1873-3212 | |
| dc.identifier.uri | http://hdl.handle.net/10400.1/13181 | |
| dc.language.iso | eng | |
| dc.peerreviewed | yes | |
| dc.publisher | Elsevier | |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | |
| dc.subject | Bio-flocculation | |
| dc.subject | Seeds | |
| dc.subject | Extraction | |
| dc.subject | Cyanobacteria | |
| dc.subject | Purification | |
| dc.subject | Removal | |
| dc.subject | Protein | |
| dc.subject | Algae | |
| dc.subject | Microalgae | |
| dc.subject | Cells | |
| dc.title | The use of Moringa oleifera as a natural coagulant in surface water treatment | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 237 | |
| oaire.citation.startPage | 226 | |
| oaire.citation.title | Chemical Engineering Journal | |
| oaire.citation.volume | 313 | |
| rcaap.rights | restrictedAccess | |
| rcaap.type | article |
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