Bandscreen Monsters Ready to Work at Picnic Point WWTP

Three Bandscreen Monsters and a Screenings Washer Monster are key components of a massive facility upgrade at the Picnic Point Wastewater Treatment Plant just north of Seattle. Serving the communities of Lynwood and Edmonds, the facility is being expanded from 3 to 6 million gallons per day(470 to 1,000 m3/h). Construction started in 2008 and will end in 2011.

In addition, the owner, Alderwood Water and Wastewater District selected the membrane bioreactor treatment process in order to produce very clean water and help protect the natural wonders of Puget Sound.

MBRs produce high-quality water but they also need high-quality screens to protect them from rags, debris, hair and other damaging material. That’s where the Bandscreen Monsters come in – high-strength UHMW screening panels with very small 5/64″ circular openings screen all wastewater before it gets to the MBRs and takes out all of the damaging debris.

This debris, together with lots of soft organics, is sent via a sluiceway into the Screenings Washer Monster where material is ground, washed, compacted and dewatered before it is dropped into a dumpster ready for landfill disposal. The SWM is the industry’s leading compactor – thanks to the grinder. It reduces the volume of material by up to 95% and breaks up clumps of material so the spray wash can remove soft organics. This keeps odor problems well under control.

Learn more about the Picnic Point expansion project at

The consulting engineer is URS Corp of Seattle and the contractor is Apollo Inc.

The machinery integrator and on-site representative for JWCE is APSCO, Inc of Kirkland.