Study of the combining adsorption-microfiltration process for the treatment of coloured waters

Addaou, A.; Laajeb, Ali; Lahsini, Ahmed; Bentama, Jilali; Rodrı́guez, Miguel A.

doi:10.3989/cyv.242012

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…Removing color from wastewater can be done via several traditional biological and physico-chemical methods (Addaou, 2012;Chern, 2001;Robinson, 2002;Gupta, 2000;Janos, 2003). Chemical methods use coagulation or flocculation (Orfao, 2006), combined with flotation and filtration.…”

Section: Introductionmentioning

confidence: 99%

The Use of Modified Beetroot Fibers by Sodium Dodecyl Sulfate (SDS) Cleaning Water Contaminated by Organic and Inorganic Compounds

Rima¹,

Rahme²,

Assaker³

2014

JFR

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The beetroot fibers were used to decontaminate water polluted by methylene blue dye (MB), to remove heavy metals from wastewater and to soften hard water. In order to improve the adsorbent performance and to determine the optimum conditions of industrial wastewater cleaning, the effect of fiber particle sizes, initial concentrations of pollutants, pH of aqueous solutions and effluent rates on the cleaning procedure were investigated. Data showed that the efficiency of cleaning increased when fiber particle size decreased (from mm to µm scale). Optimum pH value for adsorption was 6 to 6.5. Maximum metal cations retention or hardness of modified fibers by sodium dodecyl sulfate (SDS) was estimated at 70 mg per gram of fiber; while the maximum retention of methylene blue was found to be 300 mg of dye per gram of fiber. Chemical modification of fibers by an anionic surfactant such as sodium dodecyl sulfate increased the efficiency of the dye elimination by 2-fold when compared to unmodified fibers. The adsorption parameters were determined using Langmuir and Freundlich isotherms.

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Section: Introductionmentioning

confidence: 99%

The Use of Modified Beetroot Fibers by Sodium Dodecyl Sulfate (SDS) Cleaning Water Contaminated by Organic and Inorganic Compounds

Rima¹,

Rahme²,

Assaker³

2014

JFR

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Síntesis de zeolita LTA sobre soportes de corindón: Evaluación preliminar para la eliminación de metales pesados de efluentes acuosos

Jacas¹,

Ortéga²,

Velasco³

et al. 2012

Bol. Soc. Esp. Ceram. Vidr.

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En este trabajo se evalúa de forma preliminar la efectividad del empleo de materiales basados en zeolita LTA, como fase activa para su incorporación en sistemas orientados a la eliminación de metales pesados presentes en aguas residuales. Este tipo de zeolitas con el canal principal de un diámetro mínimo libre de 0,41 nm y una baja relación SiO 2 /Al 2 O 3 se presenta como un tamiz molecular interesante, que a su vez manifiesta una gran capacidad de intercambio iónico. Partiendo de este punto de vista, cristales de zeolita LTA fueron obtenidos "in situ" por síntesis hidrotermal y caracterizados por difracción de rayos X (DRX), y microscopia electrónica de barrido (MEB). Se ha estudiado el efecto del tiempo de tratamiento hidrotermal a 378 K. Asimismo, la capacidad de eliminación de metales pesados de la fase activa de los sistemas obtenidos fue evaluada en una primera etapa en soluciones diluidas de sales de cobre a pH ácido (~ 4,7). Palabras claves: zeolita, membrana, síntesis hidrotermal, remoción, metales pesados, intercambio iónico. Synthesis of LTA zeolite on corundum supports: Preliminary assessment for heavy metal removal from waste waterThe effectiveness of materials based on LTA Zeolite as active phase, for their incorporation into systems aimed at the removal of heavy metals on waste water is evaluated in a preliminary way. This type of Zeolite with the main channel of a minimum free diameter of 0,41 nm and a low SiO 2 /Al 2 O 3 ratio is an interesting molecular sieve, which in turn display a high ion exchange capacity. From this point of view, LTA Zeolite crystals were obtained "in situ" by hydrothermal synthesis and characterized by x ray diffraction (XRD) and scanning electron microscopy (SEM). We have studied the effect of hydrothermal synthesis time at 378 K. Likewise, the removal capacity of heavy metal from the active phase was evaluated in as a first step on diluted solutions of cooper salts at slightly acidic pH (~ 4,7).Key words: zeolite, membrane, hydrothermal synthesis, removal, heavy metals, ionic exchange. Vol 51, 5, 249-254, Septiembre-Octubre 2012 ISSN 0366-3175. eISSN 2173-0431. doi: 10.3989/cyv.352012 boletín de la Sociedad Española de Cerámica y Vidrio InTroduccIónDesde sus orígenes, la actividad de la raza humana ha sido la mayor responsable de la contaminación de las fuentes hídricas. Actualmente, esta situación plantea un problema global debido al incremento intensivo de la actividad tecnológica y de la vida cotidiana. (1, 2, 3) En las últimas dos décadas, muchos estudios han estado dirigidos a poner de relieve la capacidad de diferentes sistemas y procesos en la eliminación de metales pesados de las aguas residuales y lodos. [4 -7]. Algunos de estos sistemas son muy caros y no son accesibles a los países en vías de desarrollo, aunque ciertos autores (4,5,7,8) plantean la viabilidad técnica de diferentes adsorbentes de bajo coste para esos fines, en lugar del carbón activado, las resinas de intercambio iónico, etc., por citar algunos. En el curso de este período, muchos investigad...

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Study of the combining adsorption-microfiltration process for the treatment of coloured waters

Cited by 2 publications

References 12 publications

The Use of Modified Beetroot Fibers by Sodium Dodecyl Sulfate (SDS) Cleaning Water Contaminated by Organic and Inorganic Compounds

The Use of Modified Beetroot Fibers by Sodium Dodecyl Sulfate (SDS) Cleaning Water Contaminated by Organic and Inorganic Compounds

Síntesis de zeolita LTA sobre soportes de corindón: Evaluación preliminar para la eliminación de metales pesados de efluentes acuosos

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