ARSENIC REMOVAL FROM DRINKING WATER BY ION EXCHANGE RESINS

2004 ◽  
Vol 3 (3) ◽  
pp. 283-291 ◽  
Author(s):  
Carmen Iesan ◽  
Satish S. Bapat ◽  
Bill Fries ◽  
Didi Coman ◽  
Doina Florea
Keyword(s):  
Drinking Water ◽  
Ion Exchange ◽  
Arsenic Removal ◽  
Ion Exchange Resins ◽  
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.

Development of Low-Cost Arsenic Removal Process by Using Ion-Exchange Resins

2021 ◽  
pp. 139-147
Author(s):  
Priyabrata Mondal ◽  
Pankaj Kumar Roy ◽  
Nil Sadhan Mondal ◽  
Saurabh Kumar Basak ◽  
Arunabha Majumder
Keyword(s):  
Ion Exchange ◽  
Arsenic Removal ◽  
Low Cost ◽  
Ion Exchange Resins ◽  
Removal Process ◽  
Exchange Resins

scholarly journals Arsenic Mitigation Technologies from Ground Water: A Brief Review

2020 ◽  
pp. 139-158
Keyword(s):  
Drinking Water ◽  
Ion Exchange ◽  
Low Cost ◽  
Cost Effective ◽  
Water Source ◽  
Ion Exchange Resins ◽  
Activated Alumina ◽  
The World ◽  
Exchange Resins ◽  
High Arsenic

Contamination of drinking water due to the presence of as has become a global environmental and socio-economic threat. The appearance of high Arsenic (As) in drinking water causes a serious health issue around the world. Many countries in different parts of the world have reported high arsenic concentrations. Among all groundwater arsenic contamination affected countries, the position of Bangladesh is the worst. Therefore, it is very important to develop affordable and efficient techniques to remove As from drinking water to protect human health. The most used methods are oxidation, coagulation, adsorption, ion exchange, and membrane technologies. Oxidation is usually used as pretreatment for most of the methods. Coagulation is the most common arsenic mitigation technology in Bangladesh. This technique is effective from pH 6-8. Ion exchange resins can only remove arsenate. Activated alumina beds work best in slightly acidic waters and usually have much longer run times than ion exchange resins. A cost-effective method for mitigation of As from drinking water is the use of low-cost adsorbent. Membrane methods which are more costly than other arsenic mitigation techniques but very effective where very low arsenic levels are required. Providing a safe water source may not possible in some of the arsenic affected regions or sometimes this process becomes very expensive. Mitigation of As from drinking water may be more appropriate in these situations. This paper presents a review of the conventional methods used for mitigation of As from contaminated drinking water.

scholarly journals Removal of Carcinogenic Arsenic from Drinking Water By the Application of Ion Exchange Resins

Oncogen ◽  
2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Sevtap Karakurt ◽  
Erol Pehlivan ◽  
Serdar Karakurt
Keyword(s):  
Drinking Water ◽  
Ion Exchange ◽  
Ion Exchange Resins ◽  
Exchange Resins

Embedding Procedure for Water Swollen Samples

1970 ◽  
Vol 28 ◽  
pp. 504-505
Author(s):  
Ann M. Thomas ◽  
Virginia Shemeley
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ion Exchange ◽  
Structural Changes ◽  
Cross Linking ◽  
Ion Exchange Resins ◽  
Transmission Electron ◽  
First Pass ◽  
Exchange Resins

Those samples which swell rapidly when exposed to water are, at best, difficult to section for transmission electron microscopy. Some materials literally burst out of the embedding block with the first pass by the knife, and even the most rapid cutting cycle produces sections of limited value. Many ion exchange resins swell in water; some undergo irreversible structural changes when dried. We developed our embedding procedure to handle this type of sample, but it should be applicable to many materials that present similar sectioning difficulties.The purpose of our embedding procedure is to build up a cross-linking network throughout the sample, while it is in a water swollen state. Our procedure was suggested to us by the work of Rosenberg, where he mentioned the formation of a tridimensional structure by the polymerization of the GMA biproduct, triglycol dimethacrylate.

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