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1. Technology description General The Waterloo Biofilter® belongs to a broad class of treatment units called trickling filters. When used in denitrifying systems, the filters are generally configured so as to return a portion of the filtrate to the septic tank, while the remaining portion flows forward to a soil absorption system. Components As installed and tested at MASSTC the technology consisted of a 1,500 gallon concrete septic tank, a 20 -in diameter pump chamber and a Waterloo Biofilter. As Tested, a cylindrical, plastic mesh basket containing man-made fibers was suspended in the septic tank liquid. One Zabel model A100 effluent filter was fitted to the septic tank outlet tee. The pump chamber was Zabel cylindrical 50 -gallon polyethylene unit, containing a pump and two control floats. The demand control panel was fitted with visual and audible Waterloo Biofilter Distribution Box Septic Tank Pump Chamber 50% Recirculation to Septic Tank Leaching Trench alarms. The Biofilter® was a foam -insulated cedar, above -ground unit, 8'1 x 4'w x 5'h, of 160 cu ft total volume and contained approximately 108 cu ft of filter medium. The five foot tall containment of the trickling filter was buried to a depth of one foot with four feet exposed. The trickling filter was insulated on the interior surfaces and contained two, five-foot high reinforced plastic mesh cylinders about forty-five inches in diameter. These cylinders contained and supported a column of foam media. The volume of each foam cylinder was approximately 54 cu ft. A schema of a general installation is given below. Siting Considerations and Installation Notes The Biofilter® may be installed above grade, as it was for this testing, or the Biofilter® may be installed flush to grade at sites which have suitable topography and depth to the water table so the septic tank may be set deeply enough to permit gravity return flow from the Biofilter®. Below ground installations may use concrete tanks with a proper access opening, 2' x 4'. Alternately, a pump may be used in the Biofilter tank to maintain Pei formance Results — WaterlooBiofilter® Page 2 of 28