A8 series module


A8 Series Module

The Large Diameter A8 Modules permits simple, rapid, high area and inexpensive MF and UF tubular filtration for new and existing installations in the waste water industry​.

Processors today are faced with mounting pressure to reduce wastewater volumes and treatment costs. While environmental regulations and “green” politics create a demand for companies to cut effluent volumes, economics also plays a major role. Discharge costs for wastewater are rising, as are charges for disposal and landfill of sludge generated from traditional wastewater treatment systems.

Suitable for fluids with high viscosity &/or suspended solids as their wide flow paths make them highly resistant to blocking. Pre-treatment requirements are minimal and often completely avoided, so no prefiltration needed – benefit that renders them the most cost-effective choice for many small systems​

Key Applications

  • Side stream MBR
  • Recovery and reuse of water from waste streams
  • Leachate
  • Industrial Clarification
  • Brine Recovery
  • Food industry effluents
  • Metal and Mining Wastewater
  • Oil and Gas Wastewater
  • Pharmaceutical Wastewater
  • Chemical Wastewater
  • Textile Wastewater

A8 Series Module Product Information

Introduction to A8 Series module

The A8 Series design permits a simple, rapid and inexpensive membrane replacement. Other advantages include a robust and low-cost module in GRP material. The module comprises of two main parts, the membrane core and the module shroud. The core is fixed into the shroud, end seals prevent leakage of feed and concentrate from the module. While the inner O-rings prevent leakage of permeate. Modules are usually connected in series with U-bends.

The membrane core

The membrane core consists of several membrane tubes potted together at each end to form a rigid tube bundle. Figure 2 shows the cross-section of a membrane tube. The inside layer of the tube is the thin semi permeable polymeric membrane. It is the membrane layer which separates the feed liquid into two streams. A range of membrane types is available, each offering different separation characteristics.

The middle and outer layers are the support tube for the membrane. 

The ends of the membrane tubes are potted into epoxy resin. These”potted ends” contain all the fixing holes, sealing surfaces and O-ring lead in chamfers necessary for assembling and sealing the membrane core into the shroud.

Figure 2 – Cross-section of an A Series  membrane tube

The module shroud

This is the housing or vessel for the membrane core. Permeate passing through the membrane collects in the shroud before flowing out to permeate storage.

The standard shroud material is made of a glass reinforced plastic (GRP). shrouds are available 3 and 4 meter lengths. 

The membrane core is fixed into the shroud. The end seals and inner O-ring seals prevent leakage of permeate and feed/concentrate. All shrouds have two off-takes – one at each end for permeate to exit the module. The shrouds must be positioned with their offtakes vertically aligned (one at the top, the other at the bottom). During all process and cleaning operations, permeate flows out of both shroud off-takes. The top off-take allows air to enter and exit during shroud filling and draining operations.

Figure 3: A8 Series 3 m Length Module. Membrane areas, weights, dimensions and hold-up volumes are given at the back of the guide. 

Operating limits for A8 Series modules

To ensure maximum life from the modules the following operating limits must not be exceeded:

Membrane Operation Limits
Max Operating Pressure7 bar
Max Operating Temperature49C
pH Range1.5 – 10.5
Max Chlorine Exposure250 ppm at pH >9
Shroud-side PressureNever exceed tube-side pressure
Note: It should be noted that these figures are limits. Plant should not be designed to operate on the limits.

PCI Membranes’ Side-Stream Membrane Configuration Advantages

✓ Perfect replacement to competitor products with 27 mmembrane area. 

✓ Unique offer to install tubular UF membranes with cut off 20k Da, 100k Da, 200k Da, 450k Da or 0.2 micron separation point in an 8 inch housing.

✓ Superior hygiene and practical operation: side-stream installations do not require a mechanical pre-filtration system for the removal of 1 to 2 mm average or greater particle sizes. Undoubtedly this extra plant equipment creates enormous operational, health and safety problems. 

✓ Less frequent and simpler membrane cleaning operation. 

✓ Simpler membrane maintenance: the maintenance of the submersed membranes is far more complex than that required to maintain the efficiency of a side-stream membrane: submersed membranes need to be removed from the basin with all its operational logistic, environmental consideration and messy problems. 

✓ Optimum engineering, personal health and safety design: ability of intervening on the ultrafiltration membrane modules without any direct contact with the activated sludge or wastewater fluids. 

Data Sheets

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