Removal of algogenic organic matter by magnetic ion exchange resin pre-treatment and its effect on fouling in ultrafiltration

2011 ◽  
Vol 11 (1) ◽  
pp. 15-22 ◽  
Author(s):  
C. Liu ◽  
W. Chen ◽  
V. M. Robert ◽  
Z. G. Han
Keyword(s):  
Organic Matter ◽  
Ion Exchange ◽  
Membrane Fouling ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Major Barrier ◽  
Treated Water ◽  
Fouling Control ◽  
Pre Treatment ◽  
Magnetic Ion

Natural organic matter (NOM) fouling continues to be the major barrier to efficient application of ultrafiltration (UF) in drinking water treatment. Algogenic organic matter (AOM), the main contributor to total NOM levels in raw waters characterised by elevated algae levels, is currently the subject of much investigation. In this study, the effect of AOM on fouling of ultrafiltration and the effectiveness of magnetic ion exchange resin (MIEX®) pre-treatment for AOM removal and membrane fouling control was evaluated. The results showed that, the main species of algae in raw water were Chlorella vulgaris, which accounted for 80% of total algae. AOM was predominantly hydrophilic (50% or more) with a low SUVA (1.7 Lm−1 mg−1). Coagulation alone could not remove AOM effectively (less than 20%), however, when combined with magnetic ion exchange resin pre-treatment, more than 60% of AOM was be removed; pre-treatment followed by coagulation was observed to be very effective in controlling membrane fouling by AOM. The application of magnetic ion exchange resin technology at a bed volume treatment rate (BVTR) of 800 was observed to effectively eliminate fouling of UF membrane. Careful analyses of the molecular weight (MW) distribution of AOM and UV absorbance of treated water revealed that the effectiveness in membrane fouling control was the result of the changes in AOM molecular characteristics in treated water, namely a change in MW due to the preferential removal of high molecular proteins by coagulation and magnetic ion exchange resin pre-treatment. The results demonstrate that magnetic ion exchange resin followed by coagulation might be a new membrane pre-treatment option for UF membrane fouling control.

Fate of steroid hormone micropollutant estradiol in a hybrid magnetic ion exchange resin-nanofiltration process

2019 ◽  
Vol 16 (8) ◽  
pp. 630
Author(s):  
Alessandra Imbrogno ◽  
Prantik Samanta ◽  
Andrea I. Schäfer
Keyword(s):  
Water Treatment ◽  
Surface Water ◽  
Ion Exchange ◽  
Membrane Fouling ◽  
Exchange Resin ◽  
Environmental Concern ◽  
Steroid Hormone ◽  
Ion Exchange Resin ◽  
Feed Water ◽  
Magnetic Ion

Environmental contextContamination of surface water by micropollutants is a major environmental concern because of their high persistence and toxicity. Micropollutants are only partially removed in nanofiltration water treatment systems, encouraging the investigation of more complex systems involving partitioning with membrane materials, organic matter and ion exchange resins. This study elucidates the micropollutant partitioning mechanisms in this complex water treatment system. AbstractThe accumulation of micropollutants, such as steroid hormones, in magnetic ion exchange resin-nanofiltration (MIEX-NF) poses a risk to the environmental contamination of surface water where the treated water is discharged. In this study, the partitioning of the steroid hormone estradiol (E2) with humic acid (HA), MIEX and the membrane is investigated at different feed water conditions (e.g. pH and presence of calcium). The transport and adsorption of E2 in NF is not affected significantly by the E2-HA interaction. Indeed, E2 partitions with HA between 8% and 25% at different pH. This is attributed to the presence of calcium ions, which reduces the number of HA molecules available to interact with E2 molecules. The calcium interference is evident especially at pH>10, where calcite and HA precipitate to result in irreversible membrane fouling. In the hybrid MIEX-NF process, the E2-MIEX interaction occurs at all pH conditions. Approximately 40% of the E2 total mass partitions with MIEX. This is significantly higher than E2 accumulation in NF. Since the partitioning is at least partially reversible, this poses a risk for accidental E2 release into the process streams.

Importance of the order in enhancing EfOM removal by combination of BAC and MIEX®

2011 ◽  
Vol 64 (11) ◽  
pp. 2325-2332 ◽  
Author(s):  
A. Aryal ◽  
A. Sathasivan
Keyword(s):  
Organic Matter ◽  
Activated Carbon ◽  
Organic Carbon ◽  
Ion Exchange ◽  
Exchange Resin ◽  
Wastewater Reuse ◽  
Ion Exchange Resin ◽  
Wastewater Effluent ◽  
Biological Activated Carbon ◽  
Magnetic Ion

Biological activated carbon (BAC) is operationally a simple treatment which can be employed to remove effluent organic matter (EfOM) from secondary wastewater effluent (SWWE). Unfortunately, BAC removes only a limited amount of dissolved organic carbon (DOC). Thus, maximizing DOC removal from SWWE using BAC is a major concern in wastewater reuse. This study has investigated a hybrid system of BAC and Magnetic Ion Exchange Resin (MIEX®) for the enhanced removal of DOC. Performance of both BAC prior to MIEX® (BAC/MIEX®) and reverse (MIEX®/BAC) combination was evaluated in terms of DOC removal. The BAC/MIEX® showed much better DOC removal. This is because microbial activity in the BAC bed converted MIEX® non-amenable DOC to MIEX® amenable DOC. As a result, BAC/MIEX® combination synergised DOC removal. In addition, BAC was also found to be highly effective in reducing MIEX® dose for a given DOC removal from SWWE.

The removal of natural organic matter from selected Turkish source waters using magnetic ion exchange resin (MIEX®)

2007 ◽  
Vol 67 (12) ◽  
pp. 1495-1504 ◽  
Author(s):  
Mehmet Kitis ◽  
B. İlker Harman ◽  
Nevzat O. Yigit ◽  
Mehmet Beyhan ◽  
Hung Nguyen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Ion Exchange ◽  
Natural Organic Matter ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Magnetic Ion ◽  
Source Waters

Impact of magnetic ion exchange resin pretreatment on alleviating UF membrane fouling

2011 ◽  
Vol 11 (1) ◽  
pp. 7-14 ◽  
Author(s):  
H. Xu ◽  
W. Chen ◽  
J. Sun ◽  
Z. Yuan
Keyword(s):  
Molecular Weight ◽  
Ion Exchange ◽  
Membrane Fouling ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Aluminium Chloride ◽  
Water Production ◽  
Pore Blocking ◽  
Production Ratio ◽  
Magnetic Ion

The purpose of this study is to undestand the effect and mechanism of preventing ultrafiltration(UF) membrane fouling by using magnetic ion exchange resin (MIEX®) in terms of fractional compent and molecular weight of NOM. In the experiment, pretreatment decreasing trans-membrane pressure and preventing membrane fouling were studied. The result showed: when the MIEX® dosage reached 800 bed volume (BV), the polymeric aluminium chloride (PAC) dosage could be reduced to 14 mg/L, and the Trans-Membrane Pressure (TMP) could be recovered effectively after hydraulic flush. This pretreatment could remove most of the hydrophobic and hydrophilic charged organics as well as some neutral organics. Foulants of molecular weight (MW) <1000 dalton (Da) and 3000 Da < MW < 100,000 Da organics could be removed by 40.7% and 96.0%, respectively. By reducing pore blocking and membrane cake resistance, the ultrafiltration (UF) membrane reduced the total resistance of membrane. As a result, membrane fouling was alleviated and the water production ratio was enhanced.

Comparison between magnetic ion exchange resin-ultrafiltration and enhanced coagulation–filtration for the treatment of an NOM loaded surface water

2008 ◽  
Vol 8 (6) ◽  
pp. 643-651 ◽  
Author(s):  
J. Cromphout ◽  
L. Verdickt ◽  
E. Martin ◽  
R. Vanhoucke ◽  
T. Vanhullebusch
Keyword(s):  
Ion Exchange ◽  
Solid Waste ◽  
Alternative Treatment ◽  
Exchange Resin ◽  
Cost Savings ◽  
Ion Exchange Resin ◽  
Enhanced Coagulation ◽  
Treated Water ◽  
Treatment Scheme ◽  
Magnetic Ion

The raw water of the waterworks in Kluizen contains high levels of NOM and alkalinity. The current treatment concept comprises enhanced coagulation followed by sludge blanket clarification, filtration, ozonation and Granular Activated Carbon filtration (GAC). A final disinfection with chlorine is applied. The enhanced coagulation, applied to achieve maximum NOM removal, requires a lot of chemicals and produces a lot of solid waste. In spite of this, the treated water still has a relatively high TOC content, resulting in a limited biostability. This disadvantage incited VMW to investigate an alternative treatment scheme consisting of magnetic ion exchange resin, ultrafiltration, ozonation, GAC filtration and chlorine disinfection. The alternative treatment scheme was operated over a two-year period in a pilot plant with a capacity of 50 m3/h, and its results with respect to water quality, chemical demand and operational costs were compared with those of the full-scale plant. The pilot treatment gives rise to an improved removal of NOM, which can be attributed mainly to the magnetic ion exchange resin process. This was shown to have a beneficial effect on both the biostability of the treated water and on the formation of disinfection by-products. The costs associated with the magnetic ion exchange resin process, which can be attributed mainly to resin loss and regeneration, are counterbalanced by cost savings due to lower chemical demand and solid waste formation.

scholarly journals Magnetic ion-exchange resin treatment: Impact of water type and resin use

2008 ◽  
Vol 42 (8-9) ◽  
pp. 1977-1988 ◽  
Author(s):  
Max R.D. Mergen ◽  
Bruce Jefferson ◽  
Simon A. Parsons ◽  
Peter Jarvis
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Water Type ◽  
Magnetic Ion ◽  
Resin Treatment
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