Prediction of breakthrough of pesticides in GAC-filters and breakthrough of colour in ion-exchange-filters

2002 ◽  
Vol 2 (1) ◽  
pp. 103-108 ◽  
Author(s):  
S.G.J. Heijman ◽  
W. Siegers ◽  
R. Sterk ◽  
R. Hopman
Keyword(s):  
Water Quality ◽  
Ion Exchange ◽  
Natural Water ◽  
Drinking Water Treatment ◽  
Breakthrough Curves ◽  
Quality Parameters ◽  
Independent Experiment ◽  
Process Conditions ◽  
Adsorption Parameters ◽  
Exchange Resins

Adsorption columns are widely used in drinking water treatment to improve a number of water quality parameters. Granular activated carbon filtration (GAC) can be used to decrease the concentration of DOC, colour, taste, odour and pesticides. Columns filled with ion-exchange resins are used to remove colour, nitrate and DOC. The regeneration frequency of these types of filters depends strongly on the natural water quality. Especially the DOC-concentration and DOC-composition determines the efficiency of the processes. Because pilot-plant experiments with realistic contact-times will last for more than a year (for GAC) there is a need for a prediction of breakthrough based on shorter and less expensive laboratory experiments. The available models are not accurate enough because the exact parameters are not available. In batch experiments with natural water, with realistic (low) pesticide concentrations and the full grain size of the adsorbent the adsorption parameters are measured in an independent experiment. With the parameters obtained with these experiments an accurate prediction of the breakthrough curve is possible. With the same parameters predictions of breakthrough curves are calculated under different process conditions. The possibilities of process optimisation can reduce the investment costs for new full-scale plants.

Optimization of polyphenol recovery from mango peel extracts by assessing food-grade adsorbent and ion exchange resins and adsorption parameters using a D-optimal design

2015 ◽  
Vol 241 (5) ◽  
pp. 627-636 ◽  
Author(s):  
Christian Hubert Geerkens ◽  
Anna Elisabeth Matejka ◽  
Ralf Martin Schweiggert ◽  
Dietmar Rolf Kammerer ◽  
Reinhold Carle
Keyword(s):  
Optimal Design ◽  
Ion Exchange ◽  
Ion Exchange Resins ◽  
Adsorption Parameters ◽  
Food Grade ◽  
Mango Peel ◽  
Exchange Resins

Effects of ion exchange resin pre-treatment on GAC adsorption

2008 ◽  
Vol 8 (2) ◽  
pp. 181-187
Author(s):  
B. Sani ◽  
L. Rossi ◽  
C. Lubello ◽  
S. Zacchei
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Ion Exchange ◽  
Drinking Water Treatment ◽  
Life Time ◽  
Ion Exchange Resins ◽  
Dissolved Organics ◽  
Pre Treatment ◽  
Exchange Resins ◽  
By Products

In Italian drinking water treatment plants (DWTP), the problem of chlorination by-products control is very important as the Italian drinking water regulations (Dlgs. 31/2001, as enactment of the CEU directive 98/83) set very strict limits for these compounds. A possible strategy for controlling the concentrations of DBPs (disinfection by-products) is the application of treatment processes able to reduce the concentration of dissolved organic matter, the main precursor of DBPs, before the dosage of chlorine-based disinfectants. Recently, ion exchange resins for the removal of dissolved organics have shown several applications in drinking water treatment. In this experimental study, the treatment with ion exchange resins MIEX®DOC and the treatment with GAC (granular activated carbon) were evaluated for the removal of dissolved organics. Moreover, the effects of MIEX® pre-treatment on the subsequent GAC filtration phase were evaluated, with particular attention to the effects on the life-time of the GAC filter. The GAC filter operation was simulated by rapid small scale column tests (RSSCT), which allow the evaluation of the GAC breakthrough curve in a shorter time with respect to a full plant and pilot plant trials. On the basis of the experimental results, the ion exchange process was very efficient in dissolved organics removal (60–70% UV254 removal). Moreover, the results indicated that the application of ion exchange resins as pre-treatment in a conventional drinking water treatment train could increase the filter life-time in the subsequent GAC adsorption phase (about 200%) resulting in potentially important cost benefits for the overall treatment process.

scholarly journals The Use of Ion Exchange in the Recovery of Vanadium from the Mass of a Spent Catalyst Used in the Oxidation of SO2 to SO3

2014 ◽  
Vol 16 (2) ◽  
pp. 69-73
Author(s):  
Sebastian Drużyński ◽  
Krzysztof Mazurek ◽  
Katarzyna Białowicz
Keyword(s):  
Ion Exchange ◽  
Breakthrough Curves ◽  
Exchange Capacity ◽  
Ion Exchange Resins ◽  
Optimum Conditions ◽  
Spent Catalyst ◽  
Ion Exchange Capacity ◽  
Vanadium Iron ◽  
Main Components ◽  
Exchange Resins

Abstract In the studies on the recovery of vanadium from vanadium catalyst extracts, three types of polymer strongly acidic ion exchangers were used. The ion exchange resins differed in terms of granularity and their ion exchange capacity. As a result, breakthrough curves were made for three main components of the test extract, i.e.: ions of vanadium, iron and potassium. On this basis the optimum conditions for the removal of iron ions from the solution were defined and the technological concept of the process in the semi-technical scale was proposed.

Analysis of Fiber Filter Media after 6 Years of Use as a First Flush Filter

2011 ◽  
Vol 695 ◽  
pp. 93-96
Author(s):  
Ree Ho Kim ◽  
Jung Hun Lee ◽  
Sang Ho Lee ◽  
Hana Kim
Keyword(s):  
Water Quality ◽  
Ion Exchange ◽  
New Media ◽  
Rainwater Harvesting ◽  
Quality Parameters ◽  
First Flush ◽  
Filter Media ◽  
Harvesting Systems ◽  
Fiber Filter

Pollutants in rainwater often cause problems such as non-point source pollutant and deterioration of collected water quality in rainwater harvesting systems. Fiber filter media have been developed to resolve these problems by removing pollutants in rainwater by filtration and ion-exchange mechanisms. They have been also successfully applied for the treatment of first-flush rainwater. However, little information is available on the long-term efficiency and the lifetime of the fiber filter media. In this study, new and used fiber filter media were compared in terms of their filterability and ion-exchange capability. The used filter media samples were taken from a first flush filter in a rainwater harvesting system located in an elementary school in Kyonggi-Do. They were used from 2005 to 2010 without any replacement or cleaning. Water quality parameters of an inflow and outflow in the first flush filter were analyzed to quantify the on-site treatment efficiency of the used media. It was shown that the turbidity was removed by approximately 60% and COD was partly removed. The removal efficiency of particles by the used media was similar to that by the new media. Nevertheless, the removal efficiencies of nitrogen and phosphorous by the used media were substantially reduced when compared with the new media. This suggests that the fiber filter media should be periodically replaced to maintain high removals of nutrients. On the other hand, they can be used for more than 6 years if their primary purpose is to removal particles.

Bromide removal by hydrotalcite-like compounds in a continuous system

2007 ◽  
Vol 56 (11) ◽  
pp. 117-122 ◽  
Author(s):  
S. Echigo ◽  
S. Itoh ◽  
M. Kuwahara
Keyword(s):  
Ion Exchange ◽  
Ion Selectivity ◽  
Drinking Water Treatment ◽  
Continuous System ◽  
Ion Exchange Resin ◽  
Exchange Reactions ◽  
Water Matrix ◽  
Water Treatment Process ◽  
Bromide Ion ◽  
Exchange Resins

Bromide ion removal from a real water matrix by hydrortalcite-like compounds (HTCs) was attempted in a column reactor to control the formation of brominated disinfection by-products in drinking water treatment process. The performance of HTCs was found to be comparable to a commercially available ion exchange resin for relatively low alkalinity water. Also, it was deduced that HTCs are better than ion exchange resins for high sulfate water because of their unique ion selectivity. In addition, the ion exchange reactions by HTCs were faster than a commercially available resin. Thus, HTCs are expected to provide similar performance to organic resins without the concern about secondary contamination (i.e., elution of organic compounds from resins).

scholarly journals Effects of ion-exchange treatment on bromate formation and oxidation efficiency during ozonation

2012 ◽  
Vol 12 (2) ◽  
pp. 187-192 ◽  
Author(s):  
S. Echigo ◽  
S. Itoh ◽  
A. Niwa
Keyword(s):  
Ion Exchange ◽  
Drinking Water Treatment ◽  
Ion Concentration ◽  
Promising Technique ◽  
Anion Exchange Resins ◽  
Radical Concentration ◽  
Hydrophilic Compounds ◽  
Bromide Removal ◽  
Oxidation Efficiency ◽  
Exchange Resins

Ion-exchange treatment is a promising technique for removing hydrophilic compounds during drinking water treatment. In this study, we applied several different ion exchangers (i.e., anion exchange resins and a hydrotalcite compound) to bromide removal to minimize bromate formation during ozonation. It was found that ion-exchange treatment affected ozone and hydroxyl radical concentration profiles as well as bromate ion concentration after ozonation. Selecting an appropriate ion exchanger is important to achieve both the oxidation of target contaminants and the reduction of bromate ion during ozonation.

Pilot scale studies on the removal of trace metal contaminations in drinking water treatment using chelating ion-exchange resins

2002 ◽  
Vol 2 (1) ◽  
pp. 25-35 ◽  
Author(s):  
D. Stetter ◽  
O. Dördelmann ◽  
H. Overath
Keyword(s):  
Drinking Water ◽  
Ion Exchange ◽  
Removal Rate ◽  
Small Diameter ◽  
Drinking Water Treatment ◽  
Iminodiacetic Acid ◽  
Pilot Scale ◽  
Breakthrough Curves ◽  
Feed Water ◽  
Feed Concentration

Increasing nickel concentrations in groundwaters are causing treatment problems in some locations in Germany and other European countries. Ion exchange treatment using iminodiacetic acid resin was studied under various conditions in a pilot scale plant. Breakthrough curves show that nickel, cadmium and lead concentrations of below 100 μg/L can easily be reduced to 1% of the feed concentration. Assuming a minimum removal rate of 95% the treated volumes ranged from 75,000 bed volumes up to 195,000 bed volumes depending on flow rate and calcium concentration. The process has no impact on other chemical and microbiological water quality parameters. Ideally the feed water should be free from turbidity, iron and manganese, otherwise head loss will grow very fast because of high filtration rates and the small diameter of resin beads used in this process. Nevertheless, the ion exchange resin can be backwashed without increasing the metal concentration in the effluent. Ion exchange using iminodiacetic resins is therefore a suitable treatment process for the removal of heavy metals from drinking water.

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