PureULTRA UF

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Category: Industrial Product

Hollow Fiber Ultrafiltration Membrane Modules

Water resources continue to be one of the top environmental concerns around the world, leading to increased water recycling efforts in water and wastewater treatment facilities globally and reducing the consumption of fresh water. Getting wastewater to an acceptable level of purification for water reuse can be challenging as it requires several steps. On the other hand, it is important to have access to pure drinking water free from suspended solids and harmful pathogens. Ultrafiltration (UF) has shown demonstrated success in both applications.

UF is a process using a physical barrier to separate water and suspended solids, turbidity, silt, bacteria, and viruses from the feed water. In a system using pressurized PureULTRA II hollow fiber modules, the feed water may come from different sources such as surface water, groundwater, secondary or tertiary treated industrial wastewater, or other sources like tertiary treated municipal wastewater.

PureULTRA II UF modules are constructed using highly hydrophilic modified PVDF hollow fiber membrane with a tight nominal pore size of 0.025 micron. The outside-in flow configuration contributes to easier cleaning as it keeps the solids, pathogens, and other foulants on the outside of the fibers. The fiber is designed to handle most feed water sources and tolerate solids loadings while operating within an optimal flux range. These fibers offer 30% higher fiber tensile strength and elongation compared to state-of-the-art fibers on the market. They reject particulate matter, Giardia cysts, and Cryptosporidium oocysts, and can help in virus removal.

Application

RO pretreatment
Surface water treatment (plant influent)
Water reuse
Tertiary wastewater treatment
Seawater treatment

Advantages

Deliver high flow rates
Sustainable and supper performance
Most effective and reliable process
Most effective for removing particles and bacteria
Easy to use as pre-treatment (100 μm)
Compact and easy to installation
High productivity
Flexible flushing modes
Require low chemical demand

PUREULTRA II HOLLOW FIBER UF MODULES

Parameter	PHF-60-V	PHF-80-V	PHF-107-V
Membrane Type	Hollow Fiber	Hollow Fiber	Hollow Fiber
Membrane Area (m²)	60	80	107
Pore Size (μm)	0.025	0.025	0.025
Housing Material	uPVC	uPVC	uPVC
Potting	Epoxy / PU	Epoxy / PU	Epoxy / PU
Filtrate Flow Range (m³/h)	2.4 - 7.0	2.4 - 9.6	2.4 - 12.8
Filtration Flow Type	Out / In	Out / In	Out / In
Type of Filtration	Dead-End / Crossflow	Dead-End / Crossflow	Dead-End / Crossflow
Regeneration	Backflush, Forward Flush, Air Scouring	Backflush, Forward Flush, Air Scouring	Backflush, Forward Flush, Air Scouring
Max Feed Pressure at 20^o C (bar)	6.4	6.4	6.4
pH Range	1-12 (Operation) 1-13 (Cleaning)	1-12 (Operation) 1-13 (Cleaning)	1-12 (Operation) 1-13 (Cleaning)
Max Feed TSS (mg/l)	≤ 350	≤ 350	≤ 350

Module Operating Process

Air Sourcing

Air is injected into the module to loosen suspended solids on the fiber surface. This enables suspended solids in the module to be flushed out effectively and prevents the build-up of solids

Forward Flush

Feed water flushes the exterior surface of the fiber and dilutes the retentate. Air scouring is incorporated in this process to ensure the suspended solids are dislodged before the backflush. This step reduces the use of permeate during backflush.

Backflush

The membrane module undergoes a backflush cleaning sequence where filtrate is used to backflush the membrane from the inside pf the hollow fivers, dislodging the solids attached to the surface of the fiber on the side.

Filtration Process

Filtration Process

During the standard filtration process, the feed water contacts the exterior of the fibers and the product water is drown from the inside of the hollow fiber. This outside-in configuration has the advantage of larger membrane surface area, translating to higher flows.

Flushing Modes

Module	Fiber Arrangement	Membrane Material	Module Diameter (mm)	Module Length (mm)
UA420-BT	U-Shape	PAN	160	604
UA860	U-Shape	PAN	216	1642
UA1060HP	U-Shape	PAN	267	1737

Applications

Oily Water & Wastewater Treatment

Stormwater Treatment

Mine Tailing Pond Treatment

RO Pretreatment

Ground Water Treatment

Aquadyn UF Data Sheets

Brochures & References

AQUADYN® UF Product Brochure

UF Process Design Questionnaire

MICRODYN-AQUADYN-UF-Storm-Water-Reference

MICRODYN-AQUADYN-UF-Surface-Water-Reference

MICRODYN-AQUADYN-UF-Beverage-Water-Reference

AQUADYN Oily Water Treatment

ADVANTAGES

Under the proper conditions, no chemicals to purchase for maintenance. Regenerant not required.
Iron removal efficiency is extremely high.
Negligible labor cost: only periodic backwashing required.
Durable material with a long life and wide temperature range.
Weighs only 36-38 lbs./cu. ft.

PHYSICAL PROPERTIES

Color: Black
Bulk Density: 36-38 lbs./cu. ft.
Mesh Size: 12 x 50
Specific Gravity: 2.0 gm/cc
Effective Size: 0.48 mm
Uniformity Coefficient: 2.7

CONDITIONS FOR OPERATION

Alkalinity should be greater than two times the combined sulfate and chloride concentration.
Temperature Range: 35-100oF
Water pH range: 6.8-9.0
Dissolved Oxygen (D.O.) content must be equal to at least 15% of the iron and 29% of the manganese content.
Bed depth: 30-36 in.
Maximum Pressure Drop: 2-4 psi (14 -28 kPa) (Δ p increase from clean bed)
Freeboard: 50% of bed depth (min.)
Backwash rate: 10-12 gpm/sq. ft.
Rinse Rate: At service flow rate
Backwash Bed Expansion: 20-40% of bed depth (min.)
Service flow rate: 3.5-5 gpm/sq. ft. intermittent flow rates and/or favorable local conditions may allow higher flow rates

INFLUENT AND BACKWASH LIMITATIONS

Free chlorine concentration less than 0.5 ppm
Hydrogen Sulfide should be removed prior to contact with Birm media
Oil: None Present
Polyphosphates: None present
Organic Matter: Less than 5 ppm TOC

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