nanofiltration reverse osmosis Articles
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Remediation of simazine from water through low-pressure thin film composite membrane using surfactants
The investigation was carried out to remediate simazine from water by the pressure driven filtration techniques (viz. nanofiltration, reverse osmosis). The separation of simazine through the membranes showed similar trend as glucose (organic marker) and salt. Surfactant-mediated filtration showed better performance of the membranes, though it depends on the nature of membranes and surfactants. ...
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Prediction of flux decline during membrane filtration of leather plant effluent
A membrane-based scheme has been proposed for the treatment of leather plant effluent. The effluent coming out from the various steps of leather plant are combined and Nanofiltration (NF) and Reverse Osmosis (RO) are adopted. Performances of two NF membranes are evaluated. Experiments are conducted using an unstirred batch cell. It is observed that a combined operation of NF using 400 MWCO ...
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Nanjing Leachate Brine Reduction Project
Application: Landfill Leachate Concentrate Scale: 100 tons / day Process: DTRO Time: 2015 INTRODUCTION Processing scale: 100 tons / day Treatment Process: DTRO Landfill Leachate Concentrate Treatment System The original process of the project was a nanofiltration reverse osmosis system. Because the amount of concentrated water exceeded the digestive capacity of the plant, Jiarong Landfill ...
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Quantification of transient flux decline during membrane separation of tanning effluent from tannery
Cake filtration model is described to establish/quantify transient flux decline mechanism for membrane separation of tanning effluent collected from tannery. Two membrane operations, Nanofiltration (NF) followed by Reverse Osmosis (RO), are adopted to treat tanning effluent. The experiments are conducted in a continuous cross-flow mode of operation. Three-flow regimes, namely, laminar, laminar ...
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Treatment of dyeing effluent from tannery using membrane separation processes
Treatment of a dyeing bath of a tannery was carried out using a hybrid membrane-based separation scheme consisting of Nanofiltration (NF) followed by Reverse Osmosis (RO). Experiments were conducted using a cross-flow cell in continuous mode. The performance criteria of the separation scheme were evaluated in terms of dye concentration, Chemical Oxygen Demand (COD), Biological Oxygen Demand ...
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Membrane bioreactor application within the treatment of high-strength textile effluent
A pilot-scale dual-stage membrane bioreactor (dsMBR) incorporating two ultra-filtration (UF) side-stream membrane modules was designed, constructed, operated and evaluated on-site for treating high-strength textile effluent. The effluent stream was characterised by a COD range of between 45 to 2,820 mg/L and an average BOD of 192.5 mg/L. The dsMBR achieved an average COD reduction of 75% with a ...
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Desalination and water recovery: control of membrane fouling
Ultrafiltration (UF), Nanofiltration (NF) and Reverse Osmosis (RO) technologies are widely used for the production of safe drinking water, and for the recovery of reusable water from various industrial effluent streams. The most commonly encountered phenomenon in these processes, especially in water recovery application, is membrane fouling, and control of membrane fouling is regarded as a ...
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Application of the membrane fouling simulator to determine biofouling potential of antiscalants in membrane filtration
In treatment of groundwater with reverse osmosis, the applied antiscalant can significantly contribute to the formation of biofouling, especially when legislation enforces the use of biodegradable, phosphorous-free products. As an alternative to extensive piloting, the use of the membrane fouling simulator (MFS) is proposed here to assess the biomass growth potential of different antiscalants. ...
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Industrial water reuse opportunities and high temperature compatible membranes
Process condensates represent a real value to the industry as it usually contains several items of potential savings, including but not limited to heat energy and water. In most cases the condensate has become contaminated with unwanted particles or with product carryover making it unfit for direct reuse in the process or as boiler makeup water. Conventional methods use heat exchangers for ...
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Comparison of sand and membrane filtration as non-chemical pre-treatment strategies for pesticide removal with nanofiltration/low pressure reverse osmosis membranes
Pilot plant investigations of sand and membrane filtration (microfiltration (MF)/ultrafiltration (UF)/nanofiltration (NF)/low pressure reverse osmosis (LPRO)) have been performed to treat groundwater polluted with pesticides. The results show that simple treatment, with use of aeration and sand filtration or MF/UF membranes, does not remove pesticides. However, by reducing the content of key ...
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Treatment of hospital wastewater effluent by nanofiltration and reverse osmosis
Considerable concern exists regarding the appearance and effects of trace and ultra trace pollutants in the aquatic environment. In this context, it is necessary to identify relevant hot spot wastewater – such as hospital wastewater – and to implement specific wastewater treatment solutions. Membrane bioreactor (MBR) technology seems to be a suitable pre-treatment approach for the subsequent ...
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Membrane filtration of agro-industrial wastewaters and isolation of organic compounds with high added values
The aim of the current study was the exploitation of agro-industrial wastes or by-products such as olive mill wastewater (OMW) and defective wines. A cost-effective system for their maximum exploitation is suggested, using a combined process of membrane filtration and other physicochemical processes. Wastewaters are first treated in a membrane system (prefiltration, ultrafiltration, ...
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Biological treatment of ammonium perchlorate-contaminated wastewater: a review
Absolute reduction of perchlorate has proven complex owing to the diverse characteristics of the perchlorate ion. Technologies such as chemical reduction, ozone/peroxide, nanofiltration, and reverse osmosis have had limited success, high costs and are not environmentally friendly. A great deal of research and reviews on ion exchange and biodegradation have been carried out, but conditions for ...
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Industrial Water Treatment Systems & How They Work
Industrial water treatment is a vital aspect of any industrial process that uses water. It ensures that the water is purified and ready for use, thereby reducing the risk of costly damages to equipment and products, as well as minimizing operating costs. In this blog, we will discuss the importance of industrial water treatment and the various methods used to purify water. ...
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Permeability decline in nanofiltration/reverse osmosis membranes fed with municipal wastewater treated by a membrane bioreactor
Decline in the permeability in nanofiltration (NF)/reverse osmosis (RO) membranes that filtered effluents from a membrane bioreactor (MBR) treating municipal wastewater was investigated in this study. Four different 2-inch spiral-wound NF/RO membrane elements were continuously operated for 40 days. The results showed that the amount of deposits on the membrane surface did not affect the degree ...
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Air/water cleaning for the control of particulate fouling
Fouling of feed spacers in spiral wound membrane elements due to particulate fouling and biofouling is one of the main operational problems of nanofiltration or reverse osmosis membrane plants. Removal of particulate fouling from spiral wound membrane elements is investigated using frequent air/water cleaning (AWC). In a pilot setup two spiral wound elements were operated in parallel and were fed ...
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Membrane technology applied to acid mine drainage from copper mining
The objective of this study is to evaluate the treatment of high-strength acid mine drainage (AMD) from copper mining by nanofiltration (NF) and reverse osmosis (RO) at pilot scale. The performances of two commercial spiral-wound membranes – NF99 and RO98pHt, both from Alfa Laval – were compared. The effects of pressure and feed flow on ion rejection and permeate flux were evaluated. The ...
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Integrated approach for biofouling control
Despite extensive research efforts, past and present strategies to control biofouling problems in spiral-wound nanofiltration and reverse osmosis membranes have not been successful under all circumstances. Gaining insight in the biofouling process is a first necessity. Based on recent insights, an overview is given of 12 potential complementary approaches to solve biofouling. Combinations of ...
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Assessment of nanofiltration and reverse osmosis potentialities to recover metals, sulfuric acid, and recycled water from acid gold mining effluent
This work assessed the potential of nanofiltration (NF) and reverse osmosis (RO) to treat acid streams contaminated with metals, such as effluent from the pressure oxidation process (POX) used in refractory gold ore processing. NF and RO were evaluated in terms of rejections of sulfuric acid and metals. Regarding NF, high sulfuric acid permeation (∼100%), was observed, while metals were ...
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Desalination in Mining
With improvements in technology, desalination is becoming more viable both to provide source water and to treat process water Water access is a problem that must be overcome when starting or enlarging any mining project, and a lack of sufficient water in arid regions can be a deal-killer. Another water problem associated with mining (especially coal mining) is that wastewater is often too saline ...
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