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.

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.

scholarly journals Enhanced coagulation using a magnetic ion exchange resin

2002 ◽  
Vol 36 (16) ◽  
pp. 4009-4022 ◽  
Author(s):  
Philip C Singer ◽  
Katya Bilyk
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Enhanced Coagulation ◽  
Magnetic Ion

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

A magnetic ion exchange resin with high efficiency of removing Cr (VI)

2020 ◽  
Vol 604 ◽  
pp. 125279
Author(s):  
Yafeng Ren ◽  
Youhua Han ◽  
Xingfeng Lei ◽  
Chuan Lu ◽  
Jin Liu ◽  
...  
Keyword(s):  
Ion Exchange ◽  
High Efficiency ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Magnetic Ion

Performances and Mechanism of Methyl Orange and Congo Red Adsorbed on the Magnetic Ion-Exchange Resin

2020 ◽  
Vol 65 (2) ◽  
pp. 725-736 ◽  
Author(s):  
Yunhan Jia ◽  
Lei Ding ◽  
Peiyue Ren ◽  
Meiying Zhong ◽  
Jiangya Ma ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Ion Exchange ◽  
Congo Red ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Magnetic Ion

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.

Application of a Magnetic Resin (MIEX) in Raw Water

2013 ◽  
Vol 361-363 ◽  
pp. 801-804
Author(s):  
Jian Wei Ma ◽  
Ya Rui Song
Keyword(s):  
Ion Exchange ◽  
Natural Organic Matter ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Raw Water ◽  
Nitrogen And Phosphorus ◽  
Dissolved Organic Matters ◽  
Primary Focus ◽  
Magnetic Ion ◽  
Magnetic Resin

The objective of this research was to compare enhanced coagulation with anion exchange for removal of natural organic matter (NOM) and bromide. Treatment with a magnetic ion exchange resin (MIEX) was the primary focus of this study. The performance of the magnetic ion exchange resin,MIEX, in the treatment of raw water was investigated. MIEX can effectively remove UV-absorbing substances DOC. The removal of organic substances is accompanied by the elimination of other undesirable components, such as nitrogen and phosphorus. The optimal process parameters are at resin doses of 5-10 mL L1and contact time of 10-15 min, as determined via jartests. Based on this study, MIEX treatment is a suitable and efficient pretreatment method for the removal of extra dissolved organic matters and nitrates in raw water .

scholarly journals Development of a Combined Leaching and Ion-Exchange System for Valorisation of Spent Potlining Waste

2020 ◽  
Vol 11 (10) ◽  
pp. 5467-5481 ◽  
Author(s):  
Thomas J. Robshaw ◽  
Keith Bonser ◽  
Glyn Coxhill ◽  
Robert Dawson ◽  
Mark D. Ogden
Keyword(s):  
Ion Exchange ◽  
Solid Waste ◽  
Exchange Resin ◽  
Waste Product ◽  
Fixed Bed ◽  
Ion Exchange Resin ◽  
Exchange System ◽  
Fixed Bed Column ◽  
Chemical Leaching ◽  
Global Challenge

Abstract This work aims to contribute to addressing the global challenge of recycling and valorising spent potlining; a hazardous solid waste product of the aluminium smelting industry. This has been achieved using a simple two-step chemical leaching treatment of the waste, using dilute lixiviants, namely NaOH, H2O2 and H2SO4, and at ambient temperature. The potlining and resulting leachate were characterised by spectroscopy and microscopy to determine the success of the treatment, as well as the morphology and mineralogy of the solid waste. This confirmed that the potlining samples were a mixture of contaminated graphite and refractory materials, with high variability of composition. A large quantity of fluoride was solublised by the leaching process, as well as numerous metals, some of them toxic. The acidic and caustic leachates were combined and the aluminium and fluoride components were selectively extracted, using a modified ion-exchange resin, in fixed-bed column experiments. The resin performed above expectations, based on previous studies, which used a simulant feed, extracting fluoride efficiently from leachates of significantly different compositions. Finally, the fluoride and aluminium were coeluted from the column, using NaOH as the eluent, creating an enriched aqueous stream, relatively free from contaminants, from which recovery of synthetic cryolite can be attempted. Overall, the study accomplished several steps in the development of a fully-realised spent potlining treatment system. Graphic Abstract

Sign in / Sign up

Export Citation Format

Share Document