RUSSELL S BODWELL
Engineers in Muttontown, NY

5288407, Feb 22, 1994

Apr 6, 1992

7/863813

Russell S. Bodwell - Glen Head NY
William S. Houck - Dix Hills NY

Henderson and Bodwell - Plainview NY

C02F 330

210617

Process for the microbiological nitrification and denitrification of wastewater utilizes wastewater and endogenous carbon as carbon sources. After removal of settleable solids in the wastewater stream in a settling tank, wastewater is discharged into a fixed-bed, down-flow, aerobic, free draining nitrification field, containing suitable media to facilitate the growth of microorganisms capable of converting influent nitrogen, in the form of ammonia, to nitrite and then nitrate, by passing the wastewater through the nitrification field. Microbiological activity is facilitated by means of an adjustable recycle stream which adds dissolved oxygen to the aerobic nitrification field and provides sufficient dosing of the media to insure the wetting necessary to support continuous microbiological activity. Nitrified wastewater from the nitrification field discharges into a flow splitting device which divides the wastewater into two streams, one for recycling back to the nitrification field and one for denitrification in a fixed-bed upflow denitrification chamber, utilizing a suitable denitrification media. Denitrified wastewater is then conveyed to a discharge system for disposal.