Enhancement of multi-media filter performance using talc as a new filter aid material: Mechanistic study

El-Faki, Hesan; Hawari, Alaa H.; Mulligan, Catherine N.

doi:10.1016/j.jiec.2014.09.010

Cited by 10 publications

(4 citation statements)

References 19 publications

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“…More stringent discharge requirements for treated wastewater has become ever more important to improve water quality. In addition, the growing demand for water reuse in water stressed regions has driven the need for tertiary treatment of wastewater [1][2][3]. There are many different forms of tertiary treatment of wastewater, of which granular media filtration is a common choice due to its simplicity and its historical performance in drinking water treatment systems [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

The impact of filter bed depth and solids loading using a multimedia filter

Ncube

Pidou

Jarvis

2018

Separation Science and Technology

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Design and operation of tertiary wastewater filters is not always well understood because of the inherent complexities of the wastewater matrix. Here, comparison of single, dual, triple and quadruple media (anthracite, flint, alumina and magnetite) filters were made to understand how the depth, media type and solids concentration influenced performance. The filter was improved by making the media deeper, however the top 0.1m of the filter retained the most solids. Additional layers of filter materials from single, dual, triple to quadruple improved the filter performance for the same depth of filter bed.

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Section: Introductionmentioning

confidence: 99%

The impact of filter bed depth and solids loading using a multimedia filter

Ncube

Pidou

Jarvis

2018

Separation Science and Technology

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“…MMF guaranteed the best emitter performance with poorly treated wastewater [36][37][38]. Suspended materials were trapped by the filter decrease the water flow rate across the filter and eventually the sand media filter must be cleaned by backwashing [39]. Automatic backwashing can be controlled by time and/or by head loss across the filter [40].…”

Section: Mmf Processmentioning

confidence: 99%

Lead and Zinc Smelting Wastewater Treatment and Reclamation by Coagulation-Flocculation-Sedimentation, Ultrafiltration and Reverse Osmosis Technique

Fu¹

2021

JEECE

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The typical smelting wastewater is with characteristics of high concentration of TDS, conductivity, heavy metal ions, and low concentration of COD. The ultrafiltration (UF) and reverse osmosis (RO) is an attractive technology to reclaim and reuse this kind of wastewater. In this work, Coagulation-flocculation-sedimentation (CFS) and multi-media filter (MMF) was used as the pretreatment processes. UF, RO and concentration RO (CRO) processes was applied as the advanced treatment processes to reclaim the smelting wastewater. To enlarge the recovery of RO and CRO units, the influences of increasing the feed temperature by waste heat from the smelting plant and the feed pressure by change the operating frequency of the high pressure pumps were investigated. The optimize operation parameters of RO and CRO units were obtained. To understand the operation CIP cycle time of UF, RO and CRO membrane units in a long term operation, the trans-membrane pressure (TMP) and permeate flux difference were investigate. Good system operation stability, permeate flux recovery after CIP and qualified treated water were obtained in the recommend operation parameters. The results of this work can benefit to the designing of reclaiming the smelting wastewater by UF-RO-CRO approach within the Lead and Zinc smelting industrial application.

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“…Previously, turbidity was removed using sandy limestone composed of 65 ±23% calcite, 30 ±22% quartz, and traces of ankerite (1.9%), goethite (1.3%), hematite (0.4%), pyrite (0.5%), albite (0.9%) and microcline (1.6%) for the removal of turbidity and Escherichia coli in rainwater collectors, obtaining turbidity reduction >50% and E. coli concentrations in recovered water was 2-3log 10 (90-99%) less than the initial levels [PAGE et al 2015]. From the evaluation of a mixed bed composed of anthracite, fine sand, coarse sand and gravel in the removal of turbidity, it was concluded that the excellent performance was due to the physicochemical properties of talc, which acts as a coagulant due to chemical and hydrophobic interactions between talc and suspensions [ELFAKI et al 2015].…”

Section: Introductionmentioning

confidence: 99%

Journal of Water and Land Development

2022

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The objective of the present work was to evaluate the hydrodynamic behaviour of a stratified bed filtration column consisting of 4 cm of sand and 2 cm of limestone to remove turbidity and measuring the head loss through the filter in several runs. In this study, two types of sand were used as filtering bed material, one fine and one medium. Crushed limestone was also available. These materials were characterized to determine the average particle diameter, porosity, and permeability coefficient. These were respectively 1.7•10 -4 m, 336.96 and 0.68 m•day -1 for fine sand, 3.3•10 -4 m, 654.24 and 2.59 m•day -1 for the medium sand and 1.26•10 -3 m, 388.8 and 8.64 m•day -1 for crushed limestone. Using these materials, hydrodynamic analyses were carried out using clean water under rapid filtration conditions. In these analyses, different filtration rates were determined to be used in each experiment. Once the filtration rates were determined, the filtration analysis was performed with synthetic turbid water prepared at 8 NTU using tap water and bentonite. From the results obtained, a predictive model was developed based on total head losses for the evaluated filter, maintaining the rapid filtration condition. As a result, a turbidity removal efficiency of 97.7% was obtained with a total head loss of 17.8 cm at a filtration rate of 153 m•day -1 . The developed model predicted head loss as a function of operating time, filtration rate, and filter depth to maximise turbidity removal. The model showed excellent prediction accuracy with R 2 of 0.9999, which indicates that the model predictions are not biased. It was concluded that, due to the porosity of these materials, a stratified bed of sedimentary rocks has a great potential to be used in surface water filtration processes, which implies that it could be used at the rural community level as a form of water treatment, since the material is a readily available, maintenance is simple and low cost, and installation and operation are effortless.

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Enhancement of multi-media filter performance using talc as a new filter aid material: Mechanistic study

Cited by 10 publications

References 19 publications

The impact of filter bed depth and solids loading using a multimedia filter

The impact of filter bed depth and solids loading using a multimedia filter

Lead and Zinc Smelting Wastewater Treatment and Reclamation by Coagulation-Flocculation-Sedimentation, Ultrafiltration and Reverse Osmosis Technique

Journal of Water and Land Development

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