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Wastewater Treatment SystemComplete membrane filtration system for a commercial wastewater treatment company provided by Dynatec Systems.  The system gives them the ability to meet demanding requirements for discharge with the tubular ultrafiltration (UF) systems followed by two stage reverse osmosis (RO).  They can safely meet the requirements for PFAS, 1-4 dioxane, heavy metals, chemical oxygen demand (COD) and total dissolved solids (TDS). 

Membrane Technologies

Membrane Technologies have several membrane configurations available for Membrane Bioreactor (MBR) applications. Project requirements should drive the decision for membrane selection.

Technologies available for use in MBRs:Membrane filtration

  • Tubular
  • Hollow Fiber
  • Flat Sheet

Tubular Membranes

The original and most proven type of ultrafiltration is tubular membranes:

  • Sturdy construction
  • Long membrane life
  • High flux rates

Of all membrane types, they are more robust and can be subjected to high pressures in demanding applications.

Out-of-Basin MBR is a configuration where mixed liquor is pumped at high velocity through the tubular membrane module. The high velocity continuously scours the membrane surface and prevents solids from building up. This process produces high flux rates and simple operation. No backwash is required.  Lowest capital cost option because of the high flux rates and simple operation. Out-of-Basin MBRs by Dynatec are designed so that the energy requirements are equal to other types of MBR systems.

Advantages

  • Higher performance due to higher MLSS and long sludge age
  • Low Cost
  • Simple Operation
  • Entire system may be placed indoors
  • Membrane tank not required

Hollow Fiber Membranes

They are constructed of a microporous structure having a dense selective layer on the outside surface. Many fibers must be packed into bundles and potted into tubes to form a membrane module. The surface area of even a few square feet require miles of fibers. Modules must contain no defective or broken fibers, therefore production requires strict quality control.

These membranes can withstand very high pressures from the outside, but are limited on pressure exerted from the inside of the fiber, therefore backwash rates are limited to around twice the normal permeate rate. The feed fluid is applied on the outside of the fibers and the permeate is removed down the fiber bore.

Hollow Fiber membranes are applied in clean water applications and are used in MBRs, but are limited to lower concentrations of solids than the other membrane types.

Advantages

  • Low Energy
  • Membrane Space efficient for large installations >5 MGD (million gallons per day)
  • Cost effective for large installations

Disadvantages

  • Not Cost Effective for small plants
  • Membranes damaged easily
  • More complicated system
  • Cannot operate with high MLSS

For more information on membrane filtration systems, please contact us today.

https://www.dynatecsystems.com/technologies/membrane-technologies/reverse-osmosis-membrane-systems-nanofiltration-membrane-systems/

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Your Partner for Industrial Wastewater

Dynatec is an industry leader in providing membrane bioreactors and wastewater membrane
systems since 1978 in industrial and municipal applications.

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