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Desal Supplies

Unit 4, Fletcher Street

Rochdale, Lancs, OL11 1AE

Tel: +44 (0)1706 869777 / Email:

Effluent Recycling Using FilmTec XFRLE Membranes

Environmental regulations and commercial benefits are driving renewed interest in the novel application of membranes in the reclamation and re-use of water.

Once such application involves the treatment of effluent from an industrial site involved in the reclamation and recycling of lead. The water based effluent not only has high levels of heavy metals such as lead and cadmium, but due to by-products from the process it also has high chloride and sulphate levels which must be reduced.

Recently introduced environmental restrictions on the quantity of raw water that the site can abstract and the company's expansion plans mean that the site must consider the options to treat and recycle the effluent.

A six month pilot study involving a series of trials with different pre-treatment options, membrane types and cleaning regimes was conducted, this data was then used to configure a low fouling design using the Dow FilmTec XFRLE membrane which is designed for effluent applications.

The benefits of the Dow Filmtec XFRLE-400/34i element embodies Dow's latest innovations in treatment of challenging waters with high biological and organic fouling tendencies such as municipal or industrial wastewater or challenging surface water.

  • Proven fouling resistance chemistry of the Dow FilmTec BW30XFR-400/34i operating at over 30% lower pressure than conventional membranes.
  • Large 34-mil spacer optimised for pressure drop minimisation reducing the impact of fouling and enhancing the cleaning efficiency.
  • Wide chemical tolerance allowing effective and efficient cleaning of biofilms, organic compounds and scale at cleaning pH from 1 to 13.
  • High rejection of special solutes such as Nitrate, Ammonium or Silica.
  • High integrity achieved with proprietary iLEC technology (interlocking end caps), minimising the risk of O ring leaks that can contribute to poor quality water.

The final process design comprises two treatment streams each producing 30,000 litres per hour of permeate water, and will allow the site to comply with the discharge limits for heavy metals and produce a final treated water which is low in chlorides and sulphates so it can be returned to the process line for re-use.

  • The overall impact on the site is significant
  • The final process will reduce raw water consumption by 50%.
  • Compliance with the water abstraction limits.
  • The final effluent will meet the consent limits for heavy metals.
  • The planned production expansion of the site can proceed without risk.

Please click here for the XFRLE-400/34i FilmTec RO Membrane Element Data Sheet

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