Analysis and modeling of fixed bed column operations on As(V) removal by adsorption onto iron oxide-coated cement (IOCC)

Václavíková

Science and Technology of Advanced Materials

et al. 2007

179

We present preliminary results of our joint investigations to monitor and mitigate environmental pollution, a leading contributor to chronic and deadly health disorders and diseases affecting millions of people each year. Using nanotechnology-based gas sensors; pollution is monitored at several ground stations. The sensor unit is portable, provides instantaneous ground pollution concentrations accurately, and can be readily deployed to disseminate real-time pollution data to a web server providing a topological overview of monitored locations. We are also employing remote sensing technologies with high-spatial and spectral resolution to model urban pollution using satellite images and image processing. One of the objectives of this investigation is to develop a unique capability to acquire, display and assimilate these valuable sources of data to accurately assess urban pollution by real-time monitoring using commercial sensors fabricated using nanofabrication technologies and satellite imagery. This integrated tool will be beneficial towards prediction processes to support public awareness and establish policy priorities for air quality in polluted areas. The complex nature of environmental pollution data mining requires computing technologies that integrate multiple sources and repositories of data over multiple networking systems and platforms that must be accurate, secure, and reliable. An evaluation of information security risks and strategies within an environmental information system is presented. In addition to air pollution, we explore the efficacy of nanostructured materials in the detection and remediation of water pollution. We present our results of sorption on advanced nanomaterials-based sorbents that have been found effective in the removal of cadmium and arsenic from water streams. r

Section: Water and Soil Contamination Remediationmentioning

confidence: 99%

Nanostructures in environmental pollution detection, monitoring, and remediation

Václavíková

Science and Technology of Advanced Materials

et al. 2007

179

Journal of Hazardous Materials

“…However, the direct application of RM in rural areas is limited by its high alkaline, therefore, proper modification to RM was considered [12]. For example, iron based sorbents and impregnated adsorbents were found effective in removing arsenic from aqueous environment [13][14][15]. Zhang et al [9] prepared ferric modified RM as adsorbent in arsenic removal, and the arsenic adsorption capacity was high.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, most previous studies focused on ferric based absorbents or ferric-arsenic co-precipitation for arsenic removal [13][14][15]. Recent studies have mentioned the possibility of using ferrous in aqueous arsenic removal [16,17].…”

Section: Introductionmentioning

confidence: 99%

Arsenic removal from aqueous solution using ferrous based red mud sludge

Wang

Luan

et al. 2010

a b s t r a c tFerrous based red mud sludge (FRS) which combined the iron-arsenic co-precipitation and the high arsenic adsorption features was developed aimed at low arsenic water treatment in rural areas. Arsenic removal studies shown that FRS in dosage of 0.2 or 0.3 g/l can be used effectively to remove arsenic from aqueous solutions when initial As(V) concentration was 0.2 or 0.3 mg/l. Meanwhile, turbidity of supernatant in disturbing water was lower than 2 NTU after 24 h. The pH range (4.5-8.0) for FRS in effective arsenic removal was applicable in natural circumstance. Phosphate can greatly reduce the arsenic removal efficiency while the presence of carbonate had no significant effect on arsenic removal. Arsenic fractionation experiments showed that amorphous hydrous oxide-bound arsenic was the major components. When aqueous pH was decreased from 8.0 to 4.5, arsenic in FRS was not obviously released. The high arsenic uptake capability, good settlement performance and cost-effective characteristic of FRS make it potentially attractive material for the arsenic removal in rural areas.

“…In order to properly design and operate fixed bed adsorption processes, we applied the concept of the Mass Transfer Zone (MTZ) developed by Mickaels for the exchanges of ions and applied by Luchkis for adsorption [26], [3].…”

Section: E Characteristic Of the Adsorption Zonementioning

confidence: 99%

“…Many studies of the adsorption capacities of activated carbon for heavy metals in fixed bed have been reported: arsenic As (V) [2], [3], chromiumCr (VI) [4], fluoride [5], [6], Pb (II) and Cu(II) [7]. Other researchers were interested in the elimination of the dyes which constitute a bigdischarge of the textiles industries.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Dynamics Adsorption of Phenol from an Aqueous Solution on Activated Carbon Produced from Olive Stones

Nouri¹,

Ouederni²

2013

IJCEA

Abstract-A continuous fixed bed study was carried out by using granular activated carbon produced from olive stone for the removal of phenol from aqueous solution. The effects of initial phenol concentration (40-250 mg/l), feed flow rate (2.2-8.4 ml/min)and activated carbon bed depth(5-20 cm) on the breakthrough characteristics of the adsorption system were determined.The obtained results showed that the adsorption capacity increases with the bed depth and the initial concentration and it decreases at higher flow rate.Three models namely Clark, Thomas, and Yoon -Nelson were employed to predict the breakthrough curves and to determine the characteristic parameters of the column useful for column design.These models fitted well the adsorption data with coefficient of correlation R2>0.9 at different conditions. The activated carbon from olive stone was shown to be suitable adsorbent for adsorption of phenol using fixed bed adsorption.