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RPSEA Project 07122-12 TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES 1st Edition New Logic Research: VSEP® - Vibratory Shear Enhanced Membrane Filtration The patented VSEP® technique was developed by New Logic International in California. The VSEP® membrane filter pack consists of leaf elements arrayed as parallel discs and separated by gaskets. The shear waves produced by the membrane vibration cause solids and foulants to be lifted off the membrane surface and remixed with the bulk material flowing through the membrane stack (Figure 45). This high shear processing exposes the membrane pores for maximum throughput that is typically between 3 and 10 times the throughput of conventional cross-flow systems [155]. Compared to conventional RO systems, VSEP® is not limited by the solubility of minerals or the presence of suspended solids. It can be used in the same applications as crystallizers or brine concentrators and is capable of high water recoveries of up to 90% [156]. The VSEP® system can be configured to employ either RO or NF membranes in a single-stage or multiple-stage arrangement. The configuration depends on feed water quality, water quality goals of the VSEP® permeate, and targeted water recovery. Figure 45. Fouling reduction mechanisms of VSEP® (Source: [155]). The manufacturer claims that the VSEP® process has several advantages over conventional membrane process [157]. These include: Minimal pretreatment: Because of high shearing energy at the membrane surface and near the pores, colloidal fouling and concentration polarization are greatly reduced. The use of pretreatment to prevent scale formation is not required. Low fouling and scaling potential: Sinusoidal shear waves from the membrane surface help to repel approaching particles and colloids; thus, reduce fouling and scaling potential. High permeate flux: The throughput rates of VSEP® are 5-15 times higher. The sinusoidal shear waves propagating from the membrane surface act to hold suspended particles above the membrane surface allowing free transport of the liquid through the membrane. 122PDF Image | TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES
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