At a Glance

This innovative, decentralized treatment facility manages phosphorus and other pollutants to serve an affordable, multi-family, senior housing community.

Project Description

The Ozark Villas at the Shell Knob Senior Center and residential housing complex is a collection of 32 duplex units and 32 single-family homes. The wastewater system, which holds 12,000 gallons per day, is discharged to the environmentally sensitive Table Rock Lake. Because of very real concerns with phosphorus, the Missouri Department of Natural Resources required a phosphorus limit of 0.5 mg/liter. Reaching these low levels had never before been achieved in Missouri through the use of a small wastewater treatment system.

Biohabitats was asked to design a demonstration facility that would be inexpensive to build and operate. Treatment elements consisted of interceptor tanks with effluent filtering for every two units, a small diameter collection system (two inch sewer lines, no manholes), constructed wetlands with a gravel trickling filter (recycle mound), a recirculating sand filter, and an alum polymer for the phosphorus.




Physiographic Province

Ozark Plateaus


Table Rock Lake

Expertise Areas

Infrastructure, Water


Shell Knob Senior Corporation


Shell Knob, Missouri, United States