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Innovative Washer-Compactor Helps Treatment Plant Reduce Screenings Discharge from 8 Tons to 600 Pounds per Month |
By Fritz Egger, JWC Environmental
Mar 10, 2004 |
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| An operator examines the clean screenings discharge of the SWM. |
Meriden, CT — When faced with the closure of an adjacent landfill, the Meriden, Connecticut Water Pollution Control Facility was faced with the burden of installing a costly, complex waste handling system. JWC provided a cost-effective alternative, the Screenings Washer Monster™! Installed in May of 2001, this Monster has dramatically reduced organic content and overall volume, eliminating remote landfill disposal costs, while also significantly reducing handling needs and odor.
“Before the landfill adjacent to our site was closed, all we had to do was haul the screenings in our own 8 yd³ truck,” recalled Robert T. Mercaldi, Assistant Director, Water Pollution Control Division, Dept. of Public Works, and manager of the 11.6 MGD plant. “After the closure, we had to find a company licensed to haul over the road, certify testing for a list they gave us of screenings parameters to be analyzed, rent a 15 yd³ specially-lined dumpster for $1,200 a month and pay landfill drop-off charges ranging from $40-$50 a ton at sites in OH, PA and NJ,” he said. “Meanwhile, we had a complex new task to take care of in the plant, moving around odorous solids heavily loaded with organics and requiring double and triple handling.”
“We installed the new unit without need for any outside contractors, including all writing and controls and haven’t had any operational problems with it,” he stated. “It’s basically totally unattended besides having the control panel checked daily by plant operators.”
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| The SWM's 6 step process (wash, grind, wash, screen, compact, dewater) results in amazingly clean discharge that is nearly fecal free. |
“I was a little concerned when nothing came out for the first five days after startup, but I also noticed there wasn’t any odor,” he remembered. “Finally, a very dry solid, resembling shredded newspaper, extended 6 or 8 inches about the exit chute, like ashes at the end of a cigarette. That falls off into a bin and we bag it up for disposal as Special Waste, including, as of recently, state-approved us in trash-to-energy plants.”
“In addition to elimintationg the cost for out-of-state dumping and all the extra work we were doing with a backhoe, front-end loader, wheelbarros and the dumpster, we no longer needed the bar screen at our pump station. All the screenings formerly removed there can be pumped to the inlet building where the new unit is.” Mercaldi said his two remaining bar screens are fine types, with 1- ½” spacing and automatic raking systems. A single chute receives scrapings from each screen, with effluent water piped in to carry them into the SWM’s square-funnel hopper. They then move through a grinder and into a wash box, where a high-pressure spray cleans the ground up particles and washes out fecal material.
Compression and dewatering follows, with more water squeezed out in the tapered exit chute. He adds the final product has the appearance of shredded newspaper, although considerably compacted.
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| The Screenings Washer Monster from JWC Environmental. |
“We’ve been able to reduce the weight of our bar screenings from 8 tons/mo to 660 lbs/mo and their volume from 15 yd³/mo to 3 15 yd³/mo ,” he concluded. Let our revolutionaly Screenings Washer Monster tackle that waster handling challenge and see the cost—saving results yourself!
For more information about the Screenings Washer Monster (patent pending) contact JWC Environmental at (800) 331-2277, visit our web site at www.jwce.com
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