Tertiary solids filtration improves effluent quality

Scottish Water’s Iso-Disc filters deliver a far superior final effluent quality than what is required by the local suspended solids discharge criteria.

DATE 2023-11-28

Customer's voice

The Iso-Discs installed by Alfa Laval on our wastewater treatment site in Fauldhouse West Lothian fully meet the design criteria stipulated by Scottish Water.

Graham Black, Team Leader at Scottish Water and Chris Purves from the Scottish Water Process Science Team

From an operational point of view the Iso-Disc filters are easy to operate and although there were a few snags to begin with they are now a very reliable part of our treatment plant. The effort and commitment we received from Alfa Laval during and after installation has to be commended.

Robert Piercy, Senior Operator at Scottish Water’s Fauldhouse Sewage Treatment Works


The gravity-driven continuous Alfa Laval AS-H Iso-Disc Cloth Media filter with outside-in filtration removes residual solids e.g. <5 mg/l suspended solids and <10 mg/l BOD from wastewater to a high final effluent quality (down to 5-10 µm) suitable for reuse.

Learn more about the AS-H Iso-Disc Cloth Media filter.

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Alfa Laval helps reduce the environmental footprint from water and waste streams, by maximizing reuse of water, by turning waste to value, and by minimizing energy consumption and waste. We offer a complete spectrum of equipment for wastewater treatment, filtration and sludge treatment that helps produce clean effluent for discharge or water reuse, recover heat and reduce the amount of sludge for disposal. 

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