JWC Environmental is a global leader in solids reduction and separation systems for customers in several industries, including wastewater treatment, petroleum, food processing, agriculture, marine, recycling, product destruction and more. In 1973, JWCE invented the Muffin Monster, the world’s first dual-shafted wastewater grinder. Today, JWCE has shipped over 35,000 waste shredders and screens worldwide and our family of 150 employees is committed to providing customers with cutting edge technologies, services and value.

Screenings Washer Monster (SWM)

#1 Screenings Washer Compactor

The Screenings Washer Monster® (SWM) produces ultra-clean discharge using a patented system to grind, wash, compact and dewater debris captured by a screen. This screenings washer compactor is a self-contained system that produces the cleanest and most compact end product of screenings discharge compared to any wash press in the industry. With reduced volumes up to 95%, the savings in time and money are greater since less dumpster pick-ups are needed.

Pre-Conditioned Screenings

The secret of the cleanest and driest screenings from this compactor is the Muffin Monster® grinder that pre-conditions the solids before entering the wash press. The grinder breaks open rags, plastics and trash to promote washing and removal of soft organics. Liquefied organics return to the plant flow and allow the SWM to achieve cleaner screenings. Pre-conditioned screening also compact much better reducing the volume of screenings that must be hauled away.

This Monster can the load when the rain starts falling.  Unlike many wash press systems the SWM screenings washer compactor  can handle the first flush loading associated with storm flows.  The Muffin Monster grinder will chew through larger slugs of debris allowing the same levels of washing, dewatering and compacting.

Stop Headworks Odor Problems

It is not secret that the headworks can be one of the least desirable locations as a wastewater treatment plant.  The screenings can sit for days on end until the bin is full enough to be hauled away.  The SWM screenings washer monster attacks this problem head on.  By grinding the screenings prior to wash the odor causing fecal material and other organics can more easily be washed away.  This allows for longer storage times with stifling odors and also helps mitigate vector problems in the headworks area.


  • Achieve dry solids content up to 50%
  • Reduces screenings volume up to 95%
  • The discharge can be nearly free of fecal content
  • Cleaner and less odor at plant headworks


  • Muffin Monster two-shafted grinder to pre-condition solids
  • Triple zone spray washing to wash away fecal matter and organics
  • Dual-helix auger compactor enhances compaction and dewatering
  • Handles first flush loading and storm flows