Engineering Confidence since 1946



MWY is the first in Arkansas to utilize a moving bed bio-film reactor (MBBR) to meet stringent effluent limits regarding BOD, TSS and cold weather nitrification of ammonia for the new 9.0 MGD Batesville Wastewater Treatment Plant.

When complete this will be the only MBBR type municipal facility in Arkansas and it will be the largest MBBR facility following lagoon treatment in the United States.


The project is funded in part by the American Recovery Reinvestment Act and was included in Vice President Biden’s report of “100 Recovery Projects that Are Changing America.”


Paragould Biosolids facility was the first in Arkansas and among the first in the country to implement unique carousel system resulting in Exceptional Quality, Class A Biosolids which is sold to area farmers for application as fertilizer by the Paragould Light, Water & Cable (PLWC). MWY designed the major modifications that were completed in 2002.

This major modification included the unique addition of an Eimco Carousel System and the biosolids facility utilizing a gravity thickening table, aerated digester, belt filter press, boiler and dryer.


The belt filter press can process 60 gallons per minute. The boiler generates steam for the dryer, and was the first electric boiler in the United States to be used for the treatment of municipal biosolids.


PLWC’s dryer was the 3rd Municipal Application in the United States for Komline-Sanderson, and in 2002 it was the largest municipal unit installed to date. Its purpose is to dry the solids, generating a fine, sandy product. The dryer operates at a temperature of 250 to 300 Fahrenheit, and can process up to 600 lbs per hour generating approximately 5 yds of Biosolids per week.


The Paragould Wastewater Treatment Plant utilizes the largest sludge drying field in Arkansas.


Pioneering the use of Arkansas River water as a raw water source, MWY designed Clarksville’s original 8-MGD facility completed in 1993, the subsequent expansion to 12-MGD in 2003 and the current expansion to 16-MGD under construction.


This plant was the first in Arkansas to use ozone as the primary disinfectant.


This plant will now also be the first in Arkansas to use ozone for compliance with the LT2ESWTR regulation for Bin 2 disinfection of Cryptosporidium.


Design alleviates years-old dispute over the excessive levels of nutrients in the Illinois River and watershed as discharged from the city of Fayetteville’s treatment system.

The design of the 10 MGD Biological Nutrient Removal (BNR) West Side Wastewater Treatment Plant accommodated the historic commitment from Fayetteville to the State of Oklahoma to implement discharge limits more stringent than those set by the ADEQ.


At the time of construction, the Fayetteville West Side Wastewater Treatment Plant was a component of the largest single municipal projects ever undertaken in the state of Arkansas. Completed ahead of schedule and under budget in 2008.


The plant design won the state’s top award, the 2009 Grand Conceptor Award from the American Council of Engineering Companies of Arkansas.





Unique location spans state boarders for the MWY designed Holiday Island Wastewater Treatment Plant which not only needed to be expanded to meet projected population growth, but also to comply with new, stringent environmental regulations limiting phosphorus.

Spanning the Arkansas/Missouri border, expansion and improvements to this 1970s era wastewater treatment plant required complex coordination with both the Arkansas Department of Environmental Quality and the Missouri Department of Natural Resources.


The receiving waters of this facility are in Missouri, while the facility itself is located in Arkansas. MWY coordinated with both the Arkansas Department of Environmental Quality as well as the Missouri Department of Natural Resources to ensure permit requirements were acceptable to both states.


To meet requirements, the original package-plant was converted to a customized biological nutrient removal facility with flow equalization and aerated sludge storage.


MWY is the first in Arkansas to utilize the American Recovery and Reinvestment Act (ARRA) funding for the new Prairie Grove Wastewater Treatment Plant changeover from a 0.50 MGD treatment plant to a modern, efficient 0.9 MGD Biological Nutrient Removal Facility.

MWY and ECO worked extensively with the contractor during construction to ensure all requirements set forth in the environmental permits were completed on deadline as the project progressed.


To set design limits for the proposed new facilities, MWY, on behalf of the client, engaged ADEQ to determine what future NPDES permit limits could be possible.


Complexity involved simultaneous permitting and coordination of two treatment facilities and dual funding sources including ARRA and the Arkansas Natural Resources Commission.


Large, two-lane roundabout intersection that was one of the first of its kind in Northwest Arkansas and was the heart of the firm’s design of the Pauline Whitaker Parkway.

This MWY design won the 2009 Engineering Excellence Award for Transportation from the American Council of Engineering Companies of Arkansas & American Concrete & Pavement Award for Excellence in Concrete Pavements

The parkway connects Champions Drive and Pinnacle Hills Parkway to the new Perry Road Interchange on I-540 near the rapidly growing economic center, The Pinnacle Hills Promenade.

MWY design shoots for “GREEN” and achieves “LEED Goldfor Beaver Water District site/Administration Center.

ACEC/A 2010 Grand Conceptor Award Winner – Part of overall 10-acre site design and 14,000 square foot administration center.


The design sets precedents for conservation, education and LEED applications such as pervious concrete and grass parking pavers, recycled water landscaping features, stormwater retention basins and numerous other features.


MWY blends functionality with aesthetics to function seamlessly with surroundings.

The award-winning Benton Farm lift station was designed to resemble area barns and the

Har-Ber Meadows Subdivision Lift Station façade and site (yard) resembles that of the adjacent  houses on a residential street.