RO Membrane Performance Enhancement

A split reverse osmosis water filtration system that increases the efficiency and reduces waste in reverse osmosis filtration. The system has two separate reverse osmosis membrane filtration units connected in series. After the first membrane unit, a valve and flow meter allow adjustment of the proportion of the concentrated water that is sent back to the first unit for further filtration versus directly discharged. This increases the overall pure water output ratio without reducing membrane life or quality.

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Reverse osmosis membrane with anti-pollution and chemical cleaning resistance. The membrane has a base layer, a porous support layer, and a functional separation layer. The functional separation layer has three layers: a cross-linked aromatic polyamide layer, an acidic polyether copolymer layer, and an acidic modified polyvinyl alcohol layer. These layers are connected by a cross-linking agent. The layers provide high hydrophilicity and resistance to pollution and acid/alkali cleaning compared to plain aromatic polyamide membranes.

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A semipermeable membrane element for water filtration that has high water permeability, low pressure loss, and low damage risk. The membrane has a pleated structure with fold heights of 30nm and a fold width-thickness ratio greater than 1. This pleated structure provides a large surface area for improved water permeation. The raw water flow path has a high porosity (94% or more) to reduce pressure loss. The membrane element system uses elements with higher raw water side porosity on the supply side to match the lower flow rates there. This reduces pressure loss and improves system performance.

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Ultra-thin reverse osmosis membrane with improved fouling resistance and stability. The membrane has a center liquid column surrounded by a filter assembly. The filter assembly has alternating sterilization grids and membrane modules. The membrane modules have a diaphragm with irregular holes covering 30-50% of the surface. This allows water flow while reducing fouling. The sterilization grids with silver and titanium oxide provide bacterial inhibition. The alternating grids and membranes prevent fouling by reducing biofilm growth on the membrane. The grids also provide a sterilization barrier. The membrane assembly can be wound around the central column using a device with synchronized rollers and a constant pressure structure.

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A high-durability reverse osmosis membrane for water filtration that maintains performance and extends life compared to conventional membranes. The membrane has a porous support layer, a polymer support layer, and a hydrophilic selective layer. The layers are bonded tightly to prevent separation during backwashing. The polymer support layer adheres to the porous support with 20-1100 gf force, and the hydrophilic layer adheres to the polymer support with 500-1600 gf force. This prevents delamination during backwashing and cleaning. The membrane composition includes copolyester porous supports, polysulfone, polyamide, polypiperazine, or polybenzidine layers. The polymer solutions for forming the layers contain 15-20 wt% of the polymer.

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A compact multiple filtration reverse osmosis membrane element for purifying water with reduced piping, volume, and floor space compared to conventional multi-stage systems. The element has two series-connected reverse osmosis membrane filter groups. This allows repeated filtration of the incoming water through both groups without needing separate elements and piping for each stage. The compact design reduces complexity, size, and cost.

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High-throughput reverse osmosis water treatment device that can handle large volumes of water with high efficiency and reduced fouling compared to traditional reverse osmosis membranes. The device uses a rotating hydrophobic membrane assembly to separate impurities from water. The membrane rotates vertically and forms vortexes that shear and clean the membrane surface, preventing fouling. The particles in the water flow radially through the membrane pores at different times due to the vortex flow, allowing selective removal of larger particles. The device also has a drive assembly to rotate the membrane, a connection support, and a column to house the membrane.

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Multiple filtration reverse osmosis membrane element with compact and efficient design for desalination and water purification applications. The element has multiple filtration stages in a single compact housing, eliminating the need for separate elements in series. The element has multiple stacked reverse osmosis membranes, water guides, and seals to filter and concentrate the water. The membranes are connected in series with water flow channels between them. This allows repeated filtration and concentration in a single element without the complexity and space of multiple elements.

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Reverse osmosis membrane module design to improve filtration efficiency and extend membrane life when using pressurized feed water. The module has a prefilter and postfilter attached to the membrane layers. This prevents impact forces on the membrane during pressurization. The prefilter attaches to the desalination layer and the postfilter attaches to the support layer. The prefilter has a PP cotton layer and carbon sheet. The carbon sheet fits the membrane. This prefilter assembly guides the feed water, concentrated water, and pure water during module fabrication.

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Composite reverse osmosis membrane module for water purifiers with improved anti-fouling performance and longer membrane life. The module has multiple roll-type reverse osmosis membrane elements wound around central pipes. The first element's raw water inlet is connected to the second element's concentrated water outlet, with a larger cross-sectional area raw water channel upstream. This reduces flow velocity and concentration polarization on the fouling-prone concentrated water side.

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Filter module and water purification device with improved fouling resistance for better filtration performance. The filter module has a unique configuration with multiple central tubes surrounded by annular membrane segments. This allows multiple water flows through the center tubes while the annular segments separate and filter the water between them. This reduces fouling by preventing long path lengths and stable water flow that can promote fouling buildup. The water purification device uses this modified filter module for improved filtration efficiency and longer membrane life compared to conventional modules.

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A filter module for water purification with improved fouling resistance and longer life compared to conventional modules. The module has an innovative configuration that disperses concentrated water outlet and prolongs raw water flow path to reduce fouling risks. It has a central tube surrounded by rolled filter membranes forming gaps between layers. Raw water enters via a circumferential inlet and end faces. Pure water exits via the central tube, while concentrated water flows through gaps to disperse outlet. This dispersal increases flow path length, reduces fouling, and improves module performance.

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Composite reverse osmosis membrane module for water purifiers that improves membrane fouling resistance and longevity by optimizing flow velocities on the concentrated water side. The module has two wound reverse osmosis membrane elements connected in series, with the inlet of the second element communicating with the outlet of the first. The raw water inlet channel cross-sectional area of the first element is larger than the second element. This reduces raw water flow area on the concentrated water side, increasing velocity to slow fouling.

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Reducing concentration polarization on reverse osmosis membranes to improve desalination efficiency by using fluid energy. The method involves optimizing the motion of a diversion net in the membrane module to reduce fouling and scaling. By adjusting factors like driving pressure and diversion net size, the net vibrates periodically due to vortex shedding when affected only by the flow field. This reduces concentration polarization on the membrane surface.

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Reverse osmosis membranes for water purification with enhanced performance and fouling resistance. The membranes have a protective layer made from a composition containing a specific polymer material that improves salt and boron rejection while maintaining high flux. The composition includes a material with a specific chemical formula, molecular weight, optional hydrophilic polymers, and crosslinking agents.

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Reverse osmosis filter structure for desalination devices that improves water intake, flow rate, and filtration efficiency compared to existing designs. The structure uses multiple concentric membrane tubes inside a shell tube. The innermost tube has multiple wound membrane elements. This arrangement provides higher water intake due to increased surface area. The outer wall of the tubes and shell have an explosion-proof membrane to prevent fouling. The center tube collects filtered water.

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Fouling-resistant reverse osmosis membrane for water filtration applications that has excellent antifouling properties against organic, inorganic, and biological fouling materials, high flux, salt rejection, and retains antifouling and antimicrobial performance over time. The membrane structure includes a porous support layer, a thin polymer support layer on top, and a polyamide filtration layer formed by interfacial polymerization. A treatment with an antimicrobial solution on the filtration layer further enhances antimicrobial properties. The membrane manufacturing process involves coating the support with a polymer solution, interfacial polymerization to form the filtration layer, and optional antimicrobial treatment.

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High-efficiency water filter element design with improved water flow and concentration to increase purification efficiency. The filter element uses a folded membrane sheet inside a grid to allow water to exit from both sides instead of just one. This shortens concentration distances and enables multi-channel flow. The folded membrane is rolled around a central pipe with through holes to further increase flow paths. A U-shaped seal connects the membrane to the grid and pipe.

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Bifunctional layer composite reverse osmosis membrane with improved salt rejection, water flux, and fouling/chlorine resistance compared to conventional membranes. The membrane has a porous support layer sandwiched between two nano-functional layers. The first layer is a cross-linked polyaramid formed by interfacial polymerization of an aromatic diamine and triformyl chloride. The second layer is a cross-linked polyaromatic amide formed by interfacial polymerization of an aliphatic amine and trimesoyl chloride. This dual-layer design provides high salt rejection from the dense first layer and high water flux and fouling/chlorine resistance from the loose second layer.

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A high-pressure membrane element for concentrating salty water with high salt content like seawater or wastewater with high TDS levels. The element consists of five sequentially arranged membrane layers with specific compositions. The membranes are NS-1, NS-2, NS-3, NS-2, and NS-1. The element is manufactured by laminating the membranes in that sequence and then rolling it around a central pipe with inlet and outlet grids. This multi-layer membrane setup allows high-pressure concentration of very saline water without blocking or fouling issues that can occur with single-layer membranes at high salt concentrations.

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