Characterization of floc size and structure under different monomer and polymer coagulants on microfiltration membrane fouling

Wang, J.; Guan, Jing; Santiwong, S.R.; Waite, T. David

doi:10.1016/j.memsci.2008.04.008

Cited by 134 publications

(55 citation statements)

References 19 publications

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“…Compact degree of aggregates is another important factor influencing the filtration behaviors. Loosely structured flocs produce less resistance for membrane filtration, while compact flocs lead to cohesively structured cake layer with poor porosity and permeability and thus have adverse effect on membrane permeability [33]. It was noted from Fig.…”

Section: Membrane Filtrationmentioning

confidence: 87%

Impacts of organic coagulant aid on purification performance and membrane fouling of coagulation/ultrafiltration hybrid process with different Al-based coagulants

Yue

Gao

et al. 2015

Desalination

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Section: Membrane Filtrationmentioning

confidence: 87%

Impacts of organic coagulant aid on purification performance and membrane fouling of coagulation/ultrafiltration hybrid process with different Al-based coagulants

Yue

Gao

et al. 2015

Desalination

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“…The initial flux at this pressure was measured to be approximately 1000 L/m 2 /d and remained constant until day 14. In Run-3, the TMP was further increased to 3.0 kPa and operated continuously for 5 days (days [15][16][17][18][19] 2 and 3), and <0.1 mg/L (except day 2), respectively, which were approximately 99.4% of the average removal from the raw SFBW. In Run-2, feed water turbidity, Fe, and Mn were measured as 319-770 NTU, 14-78.5 mg/L, and 2.4-10.15 mg/L, respectively.…”

Section: Fluxprofile With Different Tmpsmentioning

confidence: 99%

“…Alum-based coagulants such as aluminum sulfate (Al 2 (SO 4 ) 3 ) are generally used as cost-effective coagulants in the coagulation and flocculation process. The consistency of the filtration flux largely depends on the size and structure of the flocculants formation, which eventually dependson the operating conditions such as pH and coagulant dosages [14][15][16]. For alum coagulation, size and structure of the flocculants are induced by various hydrolyzing Al species [17].…”

Section: Introductionmentioning

confidence: 99%

Application of a Low Cost Ceramic Filter for Recycling Sand Filter Backwash Water

Shafiquzzaman

Al-Mahmud

AlSaleem

et al. 2018

Water

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Abstract:The aim of this study is to examine the application of a low cost ceramic filter for the treatment of sand filter backwash water (SFBW). The treatment process is comprised of pre-coagulation of SFBW with aluminum sulfate (Alum) followed by continuous filtration usinga low cost ceramic filter at different trans-membrane pressures (TMPs). Jar test results showed that 20 mg/L of alum is the optimum dose for maximum removal of turbidity, Fe, and Mn from SFBW. The filter can be operated at a TMP between 0.6 and 3 kPa as well as a corresponding flux of 480-2000 L/m 2 /d without any flux declination. Significant removal, up to 99%, was observed forturbidity, iron (Fe), and manganese (Mn). The flux started to decline at 4.5 kPa TMP (corresponding flux 3280 L/m 2 /d), thus indicated fouling of the filter. The complete pore blocking model was found as the most appropriate model to explain the insight mechanism of flux decline. The optimum operating pressure and the permeate flux were found to be 3 kPa and 2000 L/m 2 /d, respectively. Treated SFBW by a low cost ceramic filter was found to be suitable to recycle back to the water treatment plant. The ceramic filtration process would be a low cost and efficient option to recycle the SFBW.

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“…Significant virus removal can be achieved using UF since their size ranges from 20-200 nm. Some recent limitations with respect to bacterial retention are reported for MF membranes (Wang et al, 2007). Overall the application of these technologies faces some limitations that include their inability to remove ionic species and nano-sized particles such as viruses.…”

Section: Membrane Technology For Water Treatmentmentioning

confidence: 99%

Addition of a magnetite layer onto a polysulfone water treatment membrane to enhance virus removal

Raciny

Zodrow

et al. 2011

Water Science and Technology

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Addition of a Magnetite Layer onto a Polysulfone Water Treatment Membrane to Enhance Virus Removal by Isabel RacinyThe applicability of low-pressure membranes systems in distributed (point of use) water treatment is hindered by, among other things, their inability to remove potentially harmful viruses and ions via size exclusion.According to the USEPA and the Safe Drinking Water Act, drinking water treatment processes must be designed for 4-log virus removal. Batch experiments using magnetite nanoparticle (nano-Fe304) suspensions and water filtration experiments with Polysulfone (PSf) membranes coated with nanoFe304 were conducted to assess the removal of a model virus (bacteriophage MS2). The membranes were coated via a simple filtration protocol.Unmodified membranes were a poor adsorbent for MS2 bacteriophage with less than 0.5-log removal, whereas membranes coated with magnetite nanoparticles exhibited a removal efficiency exceeding 99.99% (4-log). Thus, a cartridge of PSf membranes coated with nano-Fe30 4 particles could be used to remove viruses from water. Such membranes showed negligible iron leaching into the filtrate, thus obviating concern about colored water. Further research is needed to reduce the loss of water flux caused by coating. ACKNOWLEDGEMENTS

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Characterization of floc size and structure under different monomer and polymer coagulants on microfiltration membrane fouling

Cited by 134 publications

References 19 publications

Impacts of organic coagulant aid on purification performance and membrane fouling of coagulation/ultrafiltration hybrid process with different Al-based coagulants

Impacts of organic coagulant aid on purification performance and membrane fouling of coagulation/ultrafiltration hybrid process with different Al-based coagulants

Application of a Low Cost Ceramic Filter for Recycling Sand Filter Backwash Water

Addition of a magnetite layer onto a polysulfone water treatment membrane to enhance virus removal

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