Ideal feed pretreatment for reverse osmosis by continuous microfiltration

Chakravorty, B.; Layson, A.

doi:10.1016/s0011-9164(97)00093-3

Cited by 26 publications

(10 citation statements)

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“…The market share for MF and UF membranes is nearly half of the membrane market [2] with a wide application spectrum covering food and dairy industries, wastewater treatment, hemodialysis, and RO pretreatment [3,4]. MF and UF are pressuredriven processes where the morphology of the membrane plays a critical role in determining the final performance (flux and selectivity).…”

Section: Introductionmentioning

confidence: 99%

Understanding the non-solvent induced phase separation (NIPS) effect during the fabrication of microporous PVDF membranes via thermally induced phase separation (TIPS)

Jung

Kim

Wang

et al. 2016

Journal of Membrane Science

408

179

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Section: Introductionmentioning

confidence: 99%

Understanding the non-solvent induced phase separation (NIPS) effect during the fabrication of microporous PVDF membranes via thermally induced phase separation (TIPS)

Jung

Kim

Wang

et al. 2016

Journal of Membrane Science

408

179

View full text Add to dashboard Cite

“…Compared to other conventional treatment processes, such as sand filtration and coagulation/flocculation, using MF as a post‐treatment for biologically treated effluents shows some advantages, such as the production of high standard water quality which may allow stable RO unit operation on a long‐term basis. Furthermore, the cleaning frequency of the RO membrane is minimized, leading to a longer lifetime of the membrane module and lower operating costs …”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the cleaning frequency of the RO membrane is minimized, leading to a longer lifetime of the membrane module and lower operating costs. [29] Therefore, the effluent of the MBBR process collected during the three experimental runs was subjected to MF, which enabled the reduction of the SDI 15 value to $2.0. SDI values between 1-3 mean that the aqueous stream can be fed to a RO unit, which, under these conditions, can be operated for several months without needing to constantly clean the membrane.…”

Section: Microfiltration Experiments and Silt Density Index (Sdi) Detmentioning

confidence: 99%

MBBR followed by microfiltration and reverse osmosis as a compact alternative for advanced treatment of a pesticide‐producing industry wastewater towards reuse

2016

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The treatment of a chemical industry wastewater with the goal of reuse was evaluated in a three-step process. First, the industrial waste stream underwent biological treatment in a two-stage moving-bed biofilm reactor (MBBR) system, which allowed achieving average effluent chemical oxygen demand (COD), dissolved organic carbon (DOC), ammonium, total nitrogen (TN), and total suspended solids (TSS) concentrations of 45.5, 27.2, 1.0, 34.2, and 210 mg/L, respectively. Salt and TSS concentrations after the MBBR process were still not compatible with the requirements for effluent reuse and the silt density index (SDI 15 ) was found to be > 6.5, making a direct reverse osmosis (RO) application impractical. By employing microfiltration (MF) downstream of the biological treatment, no salt removal was observed, but the SDI 15 was reduced to around 2, enabling final RO application. Long-term RO experiments conducted at different pressures (1.5-3.0 MPa) showed that biofouling became more severe under higher pressures, leading to the enhancement of the permeate flux drop. Rejection of DOC, TN, and salt by RO corresponded to 97.8 %, 89 %, and 99 %, respectively. The combined MBBR/MF/RO process allowed the production of a highquality effluent appropriate for direct reuse in the industry as feed water in cooling towers, steam boilers, and general industrial process activities. This article is protected by copyright.All rights reserved

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“…Menachem et al [25], in their review "The Future of Seawater Desalination: Energy, Technology, and the Environment", stressed the importance of focusing on pretreatment methodologies in order to improve the energy efficiency of SWRO desalination. Numerous investigations and research studies have established that mainstream inefficiency in RO systems is due to improper feed pretreatment [26]. Therefore, a comprehensive review in this critical area addressing different pretreatment technologies is essential.…”

Section: Introductionmentioning

confidence: 99%

Reverse osmosis pretreatment technologies and future trends: A comprehensive review

2019

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Recent progress in reverse osmosis (RO) technology is not limited to RO membrane materials, module designs and RO process optimization. It involves prior feed treatment which directly impacts RO system performance. The ongoing challenges of membrane fouling in RO membranes can be addressed by increasing the operational efficiency through the use of correct pretreatment options which can mitigate organic and inorganic fouling by selectively rejecting contaminants prior to reaching the RO unit. Highly polluted water resources have put critical stress on the existing conventional pretreatment techniques, whereby membrane pretreatment has emerged as a promising alternative. This paper provides an overview of the development and current trends in conventional and nonconventional RO pretreatment techniques whereby the techniques are critically reviewed to 2 inform readers of potential improvements in such areas. This paper addresses the major drawbacks of conventional pretreatment methods which have necessitated the use of membrane pretreatment techniques. Special attention is given to microfiltration, ultrafiltration and nanofiltration methods and their development in terms of advanced membrane materials based on ceramics and self-cleaning membranes. Studies from laboratory scale standalone systems, pilot scale and large scale integrated systems for performance, cost and ecological analysis have been reviewed to familiarize readers with the many factors which need to be analyzed for selection of the appropriate pretreatment method(s). The critical review in this paper will help researchers focus more on the areas which have room for further development for cost-effective and advanced RO pretreatment techniques.

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Ideal feed pretreatment for reverse osmosis by continuous microfiltration

Cited by 26 publications

References 0 publications

Understanding the non-solvent induced phase separation (NIPS) effect during the fabrication of microporous PVDF membranes via thermally induced phase separation (TIPS)

Understanding the non-solvent induced phase separation (NIPS) effect during the fabrication of microporous PVDF membranes via thermally induced phase separation (TIPS)

MBBR followed by microfiltration and reverse osmosis as a compact alternative for advanced treatment of a pesticide‐producing industry wastewater towards reuse

Reverse osmosis pretreatment technologies and future trends: A comprehensive review

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