Evaluation of using aluminum sulfate and water-soluble Moringa oleifera seed lectin to reduce turbidity and toxicity of polluted stream water.

Autor: Freitas JHES; Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, 50670-420, Recife, Pernambuco, Brazil; Núcleo de Pesquisas em Ciências Ambientais e Biotecnologia, Universidade Católica de Pernambuco, 50050-590, Recife, Pernambuco, Brazil., de Santana KV; Núcleo de Pesquisas em Ciências Ambientais e Biotecnologia, Universidade Católica de Pernambuco, 50050-590, Recife, Pernambuco, Brazil., do Nascimento ACC; Núcleo de Pesquisas em Ciências Ambientais e Biotecnologia, Universidade Católica de Pernambuco, 50050-590, Recife, Pernambuco, Brazil., de Paiva SC; Laboratório de Análises Químicas, Universidade Católica de Pernambuco, 50050-590, Recife, Pernambuco, Brazil., de Moura MC; Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, 50670-420, Recife, Pernambuco, Brazil., Coelho LCBB; Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, 50670-420, Recife, Pernambuco, Brazil., de Oliveira MBM; Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, 50670-420, Recife, Pernambuco, Brazil., Paiva PMG; Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, 50670-420, Recife, Pernambuco, Brazil., do Nascimento AE; Núcleo de Pesquisas em Ciências Ambientais e Biotecnologia, Universidade Católica de Pernambuco, 50050-590, Recife, Pernambuco, Brazil., Napoleão TH; Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, 50670-420, Recife, Pernambuco, Brazil. Electronic address: thiagohn86@yahoo.com.br.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2016 Nov; Vol. 163, pp. 133-141. Date of Electronic Publication: 2016 Aug 12.
DOI: 10.1016/j.chemosphere.2016.08.019
Abstrakt: Aluminum salts are used as coagulants in water treatment; however, the exposure to residual aluminum has been associated with human brain lesions. The water-soluble Moringa oleifera lectin (WSMoL), which is extracted with distilled water and isolated by chitin chromatography, has coagulant activity and is able to reduce the concentration of metal ions in aqueous solutions. This study evaluated the potential of using aluminum sulfate and WSMoL to reduce the turbidity and toxicity of water from the Cavouco stream located in Recife, Pernambuco, Brazil. The water sample used (called P1) was collected from the stream source, which was found to be strongly polluted based on physicochemical and water quality analyses, as well as ecotoxicity assays with Artemia salina and seeds of Eruca sativa and Lactuca sativa. The assays combining WSMoL and aluminum sulfate were more efficient than those that used these agents separately. Furthermore, the greatest reduction in turbidity (96.8%) was obtained with the treatment using aluminum sulfate followed by WSMoL, compared to when they were applied simultaneously (91.3%). In addition, aluminum sulfate followed by WSMoL treatment resulted in residual aluminum concentration (0.3 mg/L) that was much lower than that recorded after the treatment using only the salt (35.5 mg/L). The ecotoxicity of P1 was also strongly reduced after the treatments. In summary, the combined use of aluminum sulfate and WSMoL was efficient in promoting a strong reduction of turbidity and ecotoxicity of a polluted water sample, without resulting in a high residual aluminum concentration at the conclusion of the treatment.
(Copyright © 2016 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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