ENVICON GmbH & Co. KG

Membrane Disc Diffuser EMS - Bottrop Purification Plant - Case Study

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Courtesy of ENVICON GmbH & Co. KG

Service life 14 years - efficient operation with low energy costs.

In 1996/1997, the Bottrop purification plant was equipped with more than 20,000 ENVICON EMS2 12 AeroBest membrane disc diffusers.

The wastewater of the purification plant comes to up to 60 % from industry and has a chloride content of about 2,000 mg/l. Due to the basin depth of 10 m, the compressed air from the compressors has a temperature of about 130 °C. At these high temperatures, standard aerator membranes cannot be used, which is why the customer opted for EMS2 12 AeroBest disc diffusers from ENVICON with a special EPDM membrane for use at high temperatures of up to 130 °C. Due to the depth of the basins, the membranes can be changed only during running operation, so that a long service life was also a basic requirement.

Despite the adverse conditions (wastewater composition, water depth) of the purification plant, the loss of operating pressure increased by only about 15 mbar – corresponding to an annual average increase of only 1 mbar – within an operating time of 14 years. This and the still very good bubble pattern result in highly efficient operation with low energy costs in the long-term.

Project figures

  • Plant size: 1.300.000 PE
  • Diffusers: 20.592 St. EMS2 12 AeroBest
  • Commissioned: 1996/97
  • Membranes replaced: 2011
  • Water depth: approx. 10 m
  • Wastewater: up to 60 % industrial

Membrane Disc Diffuser EMS - Bottrop Purification Plant - Case Study
Membrane Disc Diffuser EMS - Bottrop Purification Plant - Case Study

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