Evaluation of temperature impacts on drinking water treatment efficacy of magnetic ion exchange and enhanced coagulation

2012 ◽  
Vol 61 (7) ◽  
pp. 403-412 ◽  
Author(s):  
L. Anderson ◽  
M. E. Walsh
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Ion Exchange ◽  
Treatment Efficacy ◽  
Drinking Water Treatment ◽  
Enhanced Coagulation ◽  
Magnetic Ion ◽  
Temperature Impacts

Estradiol Uptake in a Combined Magnetic Ion Exchange - Ultrafiltration (MIEX-UF) Process During Water Treatment

2017 ◽  
Vol 23 (2) ◽  
pp. 328-337 ◽  
Author(s):  
Alessandra Imbrogno ◽  
Jennifer Biscarat ◽  
Andrea Iris Schafer
Keyword(s):  
Drinking Water ◽  
Humic Acid ◽  
Water Treatment ◽  
Surface Water ◽  
Ion Exchange ◽  
Acid Concentration ◽  
Drinking Water Treatment ◽  
Polymeric Materials ◽  
Aquatic Life ◽  
Magnetic Ion

Background: Estrogens and their synthetic analogues are widely used as pharmaceuticals. Upon oral administration these drugs are eventually excreted via urine. The persistence of these pharmaceuticals and inefficient removal by water treatment lead to accumulation in surface water and effluents with negative effects for aquatic life and human health. Methods: In this study, the uptake of estradiol by a combined magnetic ion exchange resin - ultrafiltration process (MIEX-UF) was investigated. This is a relatively common process used in drinking water treatment for the removal of natural organic matter. However, uptake of micropollutants, such as steroidal pharmaceuticals, may occur as a side effect of water treatment due to the high affinity for polymeric materials. To elucidate the mechanism governing estradiol partitioning between water, resin and membrane, the influence of different parameters, such as pH, humic acid concentration and membrane molecular-weight-cut-off (MWCO) was studied. Results: Humic acid concentration and pH affected estradiol uptake most. At pH 11 the most significant increase of estradiol uptake was observed for MIEX-UF process (30 ng/g corresponding to 80%) compared with individual UF (17 ng/g corresponding to 12%). The presence of humic acid slightly reduced estradiol uptake at pH 11 (about 55%) due to competition for the ion exchange binding sites. Conclusion: Results demonstrated that the uptake of estradiol, which is amongst the most potent EDCs detected in surface water, in the MIEX-UF process can reach significant quantities (30 ng/g of resin) leading to uncontrolled accumulation of this micropollutant during drinking water treatment. This study gives a novel contribution in the understanding the mechanism of the unanticipated accumulation of pharmaceuticals, such as estradiol, in the drinking water treatment process.

Magnetic ion exchange drinking water treatment in a large-scale facility

2007 ◽  
Vol 99 (1) ◽  
pp. 89-101 ◽  
Author(s):  
Ben Warton ◽  
Anna Heitz ◽  
Luke R. Zappia ◽  
Peter D. Franzmann ◽  
David Masters ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Ion Exchange ◽  
Large Scale ◽  
Drinking Water Treatment ◽  
Magnetic Ion

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.

Overcoming the drawbacks of natural coagulants for drinking water treatment

2007 ◽  
Vol 7 (4) ◽  
pp. 87-93 ◽  
Author(s):  
K. Ghebremichael
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Ion Exchange ◽  
Crude Extract ◽  
Exchange Process ◽  
Drinking Water Treatment ◽  
Animal Origin ◽  
Nutrient Loads ◽  
Natural Coagulants ◽  
The Impact

A number of natural coagulants from plants or animal origin can be effectively used for the treatment of drinking water. Some are used at household levels in traditional systems using crude (non-purified) extract. In the crude extract form, natural coagulants release organic and nutrient loads to the water resulting in poor treated water quality. In such cases it becomes necessary to purify the coagulant component from the crude extract before using it for water treatment. This paper discusses an effective and simple purification of the coagulant from Moringa oleifera seed using an ion exchange method that would overcome the drawbacks of natural coagulants. The impact of the purification process on reducing organic and nutrient release was studied. Adsorption and elution parameters of the ion exchange process were optimised. The study indicated that the purified protein has effective coagulation activity and it did not release organic and nutrient loads to the water. Compared to other purification methods used in previous studies, this is simple and of comparatively lower cost. This purification method can be readily scaled up and applied even in remote parts of developing countries. This work suggests that the concerns of natural coagulants can be overcome by simple purification and this is believed to promote their use in drinking water treatment.

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