Relative Impact on GAC Usage Rates of Operating Strategies for Treatment of Contaminated Groundwater

Dvorak, Bruce I.; Morley, Matthew C.; Denning, Patrick

doi:10.1061/(asce)1090-025x(2008)12:2(60)

Cited by 5 publications

(8 citation statements)

References 11 publications

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“…Arsenite is readily oxygenated to arsenate by the oxidation of Chlorine, permanganate, or ozone. Arsenic has been effectively removed using metal oxides as adsorbent by electrostatic force of attraction and covalent bonding on the positively charged surface but in case of GAC as adsorbent being used, then there exists hydrophobic bonding [11]. The removal of arsenic can be indicated by the pH zero point of charge (pH ZPC ).…”

Section: Arsenic Removal Using Rssctmentioning

confidence: 99%

“…The major anion that effects the removal of arsenic is silica as it reduces the adsorptive capacities of ferric oxides/hydroxides and activated alumina. This happens because the silica used decreases the iso-electric point, competes with arsenic absorption sites and chemically reacts [11]. The important factors that affect the performance of adsorption media are selectivity, capacity and adsorption kinetics.…”

Section: Arsenic Removal Using Rssctmentioning

confidence: 99%

“…The calibrated flow rate of the pump was checked by passing distilled water for 15 minutes. Experiments were conducted to test the arsenic levels in source groundwater [11].…”

Section: Arsenic Removal Using Rssctmentioning

confidence: 99%

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A Review on the Use of Rapid Small Scale Column Test (RSSCT) on Predicting Adsorption of Various Contaminants

Poddar¹

2013

IOSR-JESTFT

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Section: Arsenic Removal Using Rssctmentioning

confidence: 99%

Section: Arsenic Removal Using Rssctmentioning

confidence: 99%

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A Review on the Use of Rapid Small Scale Column Test (RSSCT) on Predicting Adsorption of Various Contaminants

Poddar¹

2013

IOSR-JESTFT

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“…Although these systems require relatively low levels of maintenance, sorbent replacement costs often constitute a large portion of operating costs (Narbaitz and Benedek, 1983;Adams et al, 1989;Clark and Adams, 1991;Hyun, 2004). As a result, previous work has investigated the use of various column configurations to improve the efficiency of such treatment systems (Denning and Dvorak, 2009;Dvorak, et al, 2008;New, 2009). …”

Section: List Of Tablesmentioning

confidence: 99%

“…To expand on the work of Dvorak et al (2008), Dvorak (2009), andNew (2009), this research aims to investigate potential improvements in sorbent usage rate, comparing single columns with and without bypass, lead-lag series with and without bypass, and two-column parallel configurations without bypass. The primary objective of these comparisons is to develop a framework for consideration of the configurations listed above to assist engineers and practitioners when evaluating different options for design and operation.…”

Section: Objectivementioning

confidence: 99%

Framework for Evaluating Sorbent Usage Rate of Various Sorption Column Configurations with and without Bypass Blending

et al. 2013

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Sorption systems are a prevalent technology in the field of environmental engineering for treating waters contaminated with organic and/or inorganic compounds. Examples of such contaminants include taste and odor, hardness, disinfection byproduct precursors, and arsenic.The primary operating costs for these sorption systems lie in sorbent replacement. Different column arrangements and the use of bypass blending have the potential to reduce sorbent usage. Thus, this research aimed to develop a decision framework to assist engineers and practitioners in considering when to apply single columns, parallel columns, and lead-lag series configurations, with and without bypass, based on sorbent usage rate. This framework utilized two parameters that were found to influence the overall performance of each configuration option. These parameters were a normalization of the breakthrough curve, expressed as a ratio of the mass transfer zone length to the lag length (MTZ:Lag), and the normalized treatment objective (C/Co). Based on these parameters, comparisons of the performance of various configurations, both with and without bypass, could be developed.The following conclusions were formed based on this research:• Systems operated at low MTZ:Lag ratios have the ability to yield significant savings in sorbent usage with the use of bypass over arrangements without bypass in single column or lead-lag arrangements.• Systems with high MTZ:Lag ratios can benefit from the use of a lead-lag series configuration to increase column bed life and reduce sorbent usage rate, with or without bypass.• Parallel column configurations can offer significant savings in sorbent usage, particularly in systems with higher treatment objectives and high MTZ:Lag ratios.• Single column configurations without bypass remain competitive with other configurations for systems with low MTZ:Lag ratios (< about 0.5) and low treatment objectives (<0.2). ACKNOWLEDGEMENTS

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Selecting the column configuration with lowest media replacement cost for small adsorption systems

Bausk

Dvorak

2016

Water Research

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A framework was developed for preliminary evaluation of the relative media replacement costs of three alternative column configurations used for adsorption systems with two vessels, such as those serving small systems. The media replacement cost is the cost of fresh media and the replacement service cost (including transportation, labor, and other non-material costs). Cost normalization methods were developed in part based on the data from US EPA Arsenic Treatment Technology Demonstration Program. Adsorption equilibrium and kinetics were modeled using the PSDM model and breakthrough curves were normalized using the target effluent to influent concentration ratio (C/Co) and the mass transfer zone fraction (%MTZBT). Two factors were found to be important for the relative replacement cost of each configuration - the frequency which at least one column needed replacement of media, and the cycle replacement cost (CRCost) which is a combination of the fresh media cost and the replacement service cost. The lead-lag configuration has the lowest annual replacement cost at low target C/Co, high %MTZBT, and high CRCost ratios. The parallel configuration performs better at high target C/Co, high %MTZBT, and high CRCost ratios. Although the single configuration (two columns operated in tandem and replaced simultaneously) has higher media consumption compared to lead-lag and parallel, it can result in the lowest replacement cost at short %MTZBT and very low CRCost ratios due to savings in the replacement service cost.

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Relative Impact on GAC Usage Rates of Operating Strategies for Treatment of Contaminated Groundwater

Cited by 5 publications

References 11 publications

A Review on the Use of Rapid Small Scale Column Test (RSSCT) on Predicting Adsorption of Various Contaminants

A Review on the Use of Rapid Small Scale Column Test (RSSCT) on Predicting Adsorption of Various Contaminants

Framework for Evaluating Sorbent Usage Rate of Various Sorption Column Configurations with and without Bypass Blending

Selecting the column configuration with lowest media replacement cost for small adsorption systems

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