Research and development to overcome fouling of membranes

Narang, Subhash C.; Sharma, Shikha; Ventura, Susanna; Roberts, D.L.; Ahner, Nicole

doi:10.2172/7238494

Cited by 1 publication

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“…This differs from the results obtained previously with polyethylene glycol and dextran (Narang, et al;1990), wherein the enhancement continued long after the power was off. We believe that the diffmnt flux response in the electrocoat paint experiments and the polyethylene glycoVaextran experiments is due to different fouling mechanisms.…”

Section: Piezo-enhancement Resultscontrasting

confidence: 99%

“…The differences between our Current analysis and the one perfoxmed for the previous annual report (Narang et al;1990) are significant. The previous analysis was based on a different application, deasphalting of oil (DAO), which is currently performed by evaporation.…”

Section: Economic Evaluation Of Piezoelectrically Enhanced Ultrafiltrcontrasting

confidence: 60%

“…While the relative flux enhancement is small compared to the several-fold enhancements previously achieved with polyethylene glycol and dextran (Narang et al;1990), Figure 14 shows that the feed flow rate necessary to achieve commercial fluxes with piemenhancement is about one half that required without piezo-enhancement. The economic implications of this result will be discussed in the next chapter.…”

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confidence: 80%

“…Table 6 shows the results of an evaluation of the economics and energy consumption for several cases of a mechanically vibrated UF system, in comparison with conventional technology and piezo-enhanced UF. The electrocoat paint application discussed previously and the deasphalting of oil (DAO) process described in the previous annual report (Narang, et al;1991) are analyzed. For the mechanically vibrated UF systems the following parameter assumptions were…”

Section: Piezoelectrically and Mechanically Enhanced Ultrafiltration mentioning

confidence: 99%

“…The results for the conventional technology and the piezoelectric UF cases with electrocoat paint are taken from Tables 4 and 5, and h m the previous annual report (Narang, et al;1991) for…”

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confidence: 99%

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Research and development to overcome fouling of membranes. Final report

Narang¹,

Sharma²,

Hum³

et al. 1998

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DISCLAIMERThis report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United Stat& Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, m mmendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. SUMMARYFouling is a serious problem'in the recovery and recycle of electrocoat pain4 and the membrane industry is actively seeking methods to reduce it. We have shown that piezoelectrically assisted ultrafiitration (PZ UF) produces significant flux enhancements during ultrafiltration of electrocoat paint; however, the high power consumption of the piezodriver offsets any pump power savings. On the other hand, high flux enhancements and a ten-fold lower energy consumption were realized by transmitting vibration directly to a UF membrane with a mechanical transducer. According to our initial experiments, these high flux enhancements may be achieved w i t h even less energy. Mechanically-assisted UF therefore promises to be a valuable process to lower the permeate and electricity cost of electmuat paint operations.We conducted experiments of ultraf'lltratioon of dextran solutions on flat sheet membranes to evaluate the dependance of PZ f l~ enhancement on parameters including the membranepiezodriver configuration, the nature of the driver, and the use of the polymer insulating coating on the driver. We found that the highest flux enhancements are obtained when the driver is in close contact to the membrane, without any intermediate separator, and a thin hard polymer coating is applied to the piezodriver for insulating purposes. Under the best experimental conditions, we achieved a flux enhancement of 4.2 for the Ntration of dextran.Additional ultrafitration experiments on flat sheet membranes were conducted for electrocoat paint under various conditions of pressure, feed flow, and paint composition. Pieze enhancements typically resulted in flux increases of about a%, but flux increases as high as a factor of 3.3 were obtained under some conditions. A 70&hour electrocoat paint ultrafiltration experiment was performed on a flat sheet membrane in a test cell simulating commercial operating conditions. Flux enhancement was consistently observed throughout the experiment upon applying power to the driver. However the flux declined slowly for both piezo-cell and control cell at the same rate, indicating that piemnhancement has no significant effect on the l...

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Section: Piezo-enhancement Resultscontrasting

confidence: 99%

Section: Economic Evaluation Of Piezoelectrically Enhanced Ultrafiltrcontrasting

confidence: 60%

mentioning

confidence: 80%

Section: Piezoelectrically and Mechanically Enhanced Ultrafiltration mentioning

confidence: 99%

mentioning

confidence: 99%

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