Heavy metals uptake by sonicated activated sludge: Relation with floc surface properties

Laurent, Julien; Casellas, Magali; Dagot, Christophe

doi:10.1016/j.jhazmat.2008.05.066

Cited by 51 publications

(25 citation statements)

References 49 publications

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“…In this study, Stanley AS and Shatin AS had RH values of 67 and 82 %, respectively, indicating the presence of both hydrophobic and hydrophilic groups at the sludge surface, and Shatin AS was slightly more hydrophobic than Stanley AS. Similar hydrophobicity results for AS (50-85 %) were reported by Jin et al (2003) and Laurent et al (2009).…”

Section: Characteristics Of Assupporting

confidence: 85%

“…where S is the specific surface area of the AS (in square meters per gram), q max is the monolayer saturation adsorption capacity (in moles per gram) obtained from the Langmuir model fitting, N is Avogadro's number (6.023× 10 23 molecules mol −1 ), and A is the area occupied by a single rhodamine B molecule (1.95×10 −18 m 2 molecule −1 ) (Laurent et al 2009). …”

Section: Specific Surface Areamentioning

confidence: 99%

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Experimental and Theoretical Approaches for the Surface Interaction between Copper and Activated Sludge Microorganisms at Molecular Scale

Sánchez¹

2016

Environmental Engineering and Activated Sludge Processes

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Understanding the removal mechanisms and kinetics of trace tetracycline by activated sludge is critical to both evaluation of tetracycline elimination in sewage treatment plants and risk assessment/management of tetracycline released to soil environment due to the application of biosolids as fertilizer. Adsorption is found to be the primary removal mechanism while biodegradation, volatilization, and hydrolysis can be ignored in this study. Adsorption kinetics was well described by pseudo-second-order model. Faster adsorption rate (k 2 02.04×10 −2 gmin −1 μg −1 ) and greater adsorption capacity (q e 038.8 μg g −1 ) were found in activated sludge treating freshwater sewage. Different adsorption rate and adsorption capacity resulted from chemical properties of sewage matrix rather than activated sludge surface characteristics. The decrease of tetracycline adsorption in saline sewage was mainly due to Mg 2+ which significantly reduced adsorption distribution coefficient (K d ) from 12,990 ± 260 to 4,690 ± 180 L kg −1 .Species-specific adsorption distribution coefficients followed the order of. Contribution of zwitterionic tetracycline to the overall adsorption was >90 % in the actual pH range in aeration tank. Adsorption of tetracycline in a wide range of temperature (10 to 35°C) followed the Freundlich adsorption isotherm well.

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Section: Characteristics Of Assupporting

confidence: 85%

Section: Specific Surface Areamentioning

confidence: 99%

Experimental and Theoretical Approaches for the Surface Interaction between Copper and Activated Sludge Microorganisms at Molecular Scale

Sánchez¹

2016

Environmental Engineering and Activated Sludge Processes

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“…Only when the pH was 3, the effect of ultrasonic treatment on the materials was minimal, and for the coal fly ash, the sorption uptake was slightly higher for the treated material. The Zn uptake enhancement was assigned to modifications in the morphology and size particle distribution of the clays and fly ash after being treated by an ultrasound process making it more ready for the sorption process of heavy metals, as it has been demonstrated by others [25][26] .…”

Section: Effect Of Ultrasonic Activation Of Sorbent Materialsmentioning

confidence: 75%

Kinetics Studies on the Process of Zn Removal from Wastewater Using Ultrasonically Activated Sorbents

Flores¹

2017

Chem.Biochem.Eng.Q.

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Heavy metals pollution in industrial wastewater is a great environmental challenge. Several techniques and materials have been recently proposed in order to overcome this problem, such as the adsorption process; however, in order to be competitive, new improved low-cost materials must be proposed or developed. In the present work, the remediation of Zn-contaminated water using fly ash and Tonsil was studied. Both materials are considered low-cost sorbents since they are a byproduct of an industrial process, or locally abundant in nature. To increase the Zn uptake, the materials were activated by applying ultrasonic energy. It was found that the pH is an important parameter to be controlled since the larger sorption capacity occurred at pH = 4. Also, the materials activated with ultrasound were able to adsorb greater Zn quantities at the studied experimental conditions. Finally, the kinetics of the adsorption process was analyzed, and several mathematical models were proposed to simulate the experimental data. After making some statistical discrimination, the Lagergren model was selected to represent the sorption of Zn on the different materials studied.

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“…-For the weakest ozone doses (until 8.1 mg O 3 /g TS), the observed Q max increase could be due to the generation of fine particles (see Section 3.1), leading to a larger specific surface area which provided more active sites for cadmium binding to sludge particles. Similarly, the increase of specific surface area after ultrasonic disintegration was previously shown to increase cadmium sorption capacity of activated sludge [37]. At the same time, the increase of soluble phosphate concentration could have favored cadmium precipitation (see Section 3.1).…”

Section: Cadmium Uptake By Ozonized Sludgementioning

confidence: 80%

Cadmium biosorption by ozonized activated sludge: The role of bacterial flocs surface properties and mixed liquor composition

Laurent¹,

Casellas²,

Pons³

et al. 2010

Journal of Hazardous Materials

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Heavy metals uptake by sonicated activated sludge: Relation with floc surface properties

Cited by 51 publications

References 49 publications

Experimental and Theoretical Approaches for the Surface Interaction between Copper and Activated Sludge Microorganisms at Molecular Scale

Experimental and Theoretical Approaches for the Surface Interaction between Copper and Activated Sludge Microorganisms at Molecular Scale

Kinetics Studies on the Process of Zn Removal from Wastewater Using Ultrasonically Activated Sorbents

Cadmium biosorption by ozonized activated sludge: The role of bacterial flocs surface properties and mixed liquor composition

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