(DOC) and improving the quality of potable water. In addition, it can promote bacterial re-growth in pipes by acting as a ‘food’. Once production was under control, Orica extended the production run to 40 batches, then extended it again when they won a contract to install MIEX® at the Wanneroo water treatment plant in WA. Test batches in the lab with the raw materials showed that the problem lay with the iron oxide pre-mix. The advantages of magnetic ion exchange are: Magnetic ion exchange has a long history. He then had the insight that a resin like the ICI/CSIRO SIROTHERM® might be able to do the job because it did not require the use of packed columns. There are now 37 MIEX® systems operating internationally and a further 8 under construction, at present treating close to 500 megalitres per day of capacity, and an estimated additional 300 megalitres was installed during 2009. Therefore, MIEX resin is a promising technology for the removal of chlorite from aqueous solution. A full-scale (110 ML/d) potable water treatment plant (WTP) based on the MIEX process, an innovative new process based on a strong base anion-exchange resin with magnetic properties, has been operating in Perth Western Australia since 2001. MIEX® DOC Known for its ability to remove up to 80% of Dissolved Organic Carbon (DOC) This first generation of MIEX® resin helps water treatment plants become compliant with stage 2 regulations for Disinfection By-Products (DBPs) and lower their coagulant and total oxidant demand. End-user response animation. CSIRO then went to a local manufacturer – Yorkshire – who made the pre-mix in their larger scale lab equipment. MIEX® is an innovative process technology developed by Orica Watercare in conjunction with two leading research organisations: CSIRO Division of Molecular Science and South Australia Water Corporation. The resin is a strong base anion exchange developed with improvements resulting in high affinity for the removal of dissolved organic carbon (DOC). The adsorption kinetics of antibiotics on the MIEX resin could be simulated by the pseudo-second-order model (R2=0.99), and the adsorption isotherm data were well described by the Langmuir model (R2=0.97). The resin and the process of making it had to be scaled up – and this led to some very interesting times! SE treatment by the hybrid process of MIEX followed by ozonation was evaluated based on the removal of BOIs, OMPs, bio-toxicity and fluorescence, and more information on the inherent correlations between spectrographic indicators, OMPs, and bio-toxicity under the MIEX desorption process was provided. Once they are fully loaded, the beads can be recovered and regenerated by using brine to desorb the ions. Central to the system is a micro, strong base, magnetic ion exchange resin, which was specially developed and optimised for DOC removal. Unlike other MIEX® models, the MIEX® Mini utilizes downflow “in situ” regeneration – but does utilize upflow fluidized treatment and MIEX® resins. The 99.9% recovery figure is based on the resin mass leaving the MIEX process in the treated water stream. [Source: CSIRO], CSIRO’s Benchtop demonstration MIEX® plant, with contactor/mixing tank on the left, and settler tank on the right: resin collects on the bottom of the settler and is pumped to regeneration and re-use in the contactor. The objective of the study was to compare the treatment efficiency obtained with the MIEX®DOC process and ultrafiltration as well as to investigate the effect of MIEX®DOC water pretreatment on the performance of ultrafiltration membranes. We used a unique magnetite media (magnetic) filter to capture resin fines from the MIEX process. To make it suitable for drinking, water must be treated so that the suspended matter is removed, and any pathogens killed by disinfection with chlorine or ozone. https://csiropedia.csiro.au/MIEX-water-purification-process The data were compared with the efficiencies of the conventional unit processes for organics removal at Lever WTP. Published by Elsevier Ltd. Nitrate is an anion and thus can be removed by ion exchange using the MIEX® Resin. MIEX Resin Treatment Alum Coagulation Clarification Raw Water Filtration Product Water Pre-chlorine Alum Figure 4: Wanneroo GWTP Process, including MIEX® Plant The results from Trial 2 showed that greater than 75% DOC and 90% NSRS removal could be consistently achieved when the resin process was used in conjunction with conventional or Resin loss. These were used in the next two batches, which were completely successful. MIEX®DOC process revealed to be more efficient in DOC removal than conventional treatment achieving the efficiencies in the range of 61-91 %, lowering disinfection by-products formation potential of the water. DOC itself is harmless, but it can interfere in these treatment processes. Two bed volumes of the solution were added into a conical tube with the exhausted resins and stirred for 30, 60, 90 and 120 min. 0000000727 00000 n it is a batch, not a continuous process, and so harder to monitor and control. The process is a pre-treatment incorporating MIEX® DOC resin for the removal of DOC. MIEX® process was specifically useful in removing the hydrophilic portion of DOC in the secondary effluent, which is the major component in water. Before using MIEX, it was rinsed with DI water three times of the volume of the resin. MIEX® Background. The first MIEX® pilot plant was a 200 kilolitre unit at Hope Valley. The process of ion exchange is a two-stage process comprising of a high-rate mixed reactor and a resin regeneration system. water quality. In conventional ion exchange the plastic beads are packed into a large steel or plastic column and impure water forced through under pressure to produce water of higher quality. used in water treatment to remove unwanted contaminants. To this end, the resin was allowed to settle in a conical tube and was placed above a magnet to accelerate the settling. This plant has been configured so that a combined MIEX-coagulation (MIEX-C) process can be operated in parallel with a conventional enhanced … In the high reactor, raw water is fed to the base of the reactor vessel and is mixed with the MIEX ® resin and the ion exchange process occurs in a uniformly mixed fluidized bed. it was called the MIEX® process, the acronym for magnetic ion exchange. The resin consisted of crosslinked polyvinyl alcohol beads, sometimes grafted with acrylates, containing magnetic oxides. We had successfully scaled up the resin synthesis by a factor of almost 1 000 by September 1995 – or so we thought. The transmittance at the assigned bands was significantly lower for the combinations of coagulation or MIEX with BAC treatment than the standalone processes (Figure 4b), indicating that the sequential treatment process was more effective for removing the organic matter resulting in less deposition of organics on the surface of the MF membrane. A further hiccup was encountered when supply of one of the critical raw materials in the pre-mix ceased, and a substitute had to be found rapidly. [Source: CSIRO], Process diagram of a MIEX water treatment plant. 0000086484 00000 n 0000003986 00000 n The MIEX® resin process uses mixed tanks for contacting resin with water. The water we drink comes mostly from dams and rivers and contains various impurities such as dirt, leaves, Escherichia coli, giardia, and dissolved organic carbon (DOC). 0000003427 00000 n Reduction of organics at the head of a water treatment plant is critical to lowering operational costs and improving plant performance. The MIEX process is a novel ion exchange approach specifically developed for the removal of the dissolved organic content (DOC) from water. The addition of Plus resin to a process train with MIEX resin allows for one treatment process to remove both DOC and hardness, where a single brine waste stream can be sent to sewer at a full-scale plant, completely removing lime chemical addition and sludge waste disposal for precipitative softening processes. MIEX® process as a pre-treatment removed a majority of small molecular weight organic matter (500–1000 Da). A second batch of pre-mix was made under close supervision, and used in production batches D6 and D7 – which also set solid, though not as badly. This is a relatively common process used in drinking water treatment for the removal of natural organic matter. The 99.9% recovery figure is based on the resin mass leaving the MIEX process in the treated water stream. The development of the MIEX® resin and water treatment process is well documented as a team effort between the Commonwealth Scientific and Industrial Research Organisation (CSIRO) who developed the resin, South Australian Water Corporation who developed the water treatment application and ICI Australia (later to become Orica after divestment by ICI PLC) who commercialized the technology. The first two processes are integral to the main water treatment plant, while the resin regeneration is conducted in a … [Source: CSIRO], CSIRO’s 200 litre, 2 storey tall, Process Bay reactor. The treated water was collected for PFAS analysis to evaluate the adsorption efficiency of the pristine resin. 0000001949 00000 n MIEX® is used as a pre-treatment at the start of a conventional water treatment plant. The MIEX® treatment process is a patented process developed by Orica Watercare, Inc (Orica). Dissolved organic carbon organic carbon Subject Category: Miscellaneous see more details can be removed effectively as well as chlorite and chlorate using MIEX resin in real water. MIEX® advanced ion exchange solutions are applied using a MIEX® or MICo® process, via MIEX® treatment systems (MagnaPak®, Mini, Dual RateStage, High Rate or Integra) and utilizing MIEX® resins (DOC or GOLD) or (Plus) resin and media blends. [Source: Orica], The MIEX section of the Mt Pleasant plant. This is a relatively common process used in drinking water treatment for the removal of natural organic matter. The surface water became less humic after MIEX treatment, as demonstrated by the decrease in A/T ratio compared to the raw surface water, but then humic content increased with continuous resin use. The removal of chloride on MIEX resin is an ion-exchange mechanism. It usually contains several impurities: suspended solid matter, such as dirt, leaves and so on; waterborne diseases such as Escherichia coli, giardia or worse; and dissolved organic carbon (DOC), also known as natural organic matter (NOM) and as ‘Colour’. Mergen M, Jarvis P, Jefferson B & Parsons SA (2006) Impact of MIEX DOC resin pre-treatment on properties of coagulation flocs.. When made at small scale, it remained cool, but when made at commercial scale, it became quite hot. Magnetic ion exchange (MIEX®) resin can remove a majority of hydrophilic compounds and a significant amount of hydrophobic compounds from biologically treated secondary effluent within a short contact time of 20 min. It is a continuous ion exchange process performed in tanks, which is maintained in a steady state by the withdrawal and regeneration of loaded resin, and the return of this resin to the process. CSIRO: Mat Ballard, Don Weiss, Heng Taing, Mike Falkiner, Stuart Littler, Neil Furlong, Darrell Wells, George Georgakalis, Mike Wedding, Nick Booker, Steve Gray, Jim Bates, Rob Eldridge, David Adam, Ngoc Le, Steve Vickers, Tracy Appleby, ORICA: Hung Nguyen, Onn Chin, Matt Kirk, Russell Mills, Marin Sljunsky, Veronica Pearce, Stuart Harrison, Phil Ritchie, Ishmael. The next step up was 200 litre: the first two batches were quite poor, with small particle size, and poor magnetic oxide incorporation. A very small amount of resin (5-10 mL settled resin per litre water) is used to exchange organics from water during 15-30 min detention time in a continuous, stirred tank reactor. Article MIEX Resin Water Treatment Process. In the end, almost 200 batches of MIEX® resin were made at CSIRO. 0000001531 00000 n The influence of MIEX® resin dose and membrane cut-off on natural organic matter removal (NOM) efficiency was analyzed. The MIEX process proposed at Tarbert is based around using MIEX Resin developed by MIEX UK. In 1953, Earl C Herkenhoff from American Cyanamid Co patented magnetic ion exchange, in which he incorporated magnetite into a phenolic ion exchange resin, and claimed that the resin could be recovered by magnetic means. The key process units include a gravity fed, high rate contactor vessel containing the MIEX Resin and the Resin Regeneration skid. While there were several routes to a possible resin for DOC removal, Ballard realised that most were not commercially viable due to toxicity or cost of raw materials. The MIEX process is a novel ion exchange approach specifically developed for the removal of the dissolved organic content (DOC) from water. 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