Denitrification of Blackwater with Greywater

by Rein Laak, (M.ASCE), Assoc. Prof. of Civ. Engr.; Univ. of Connecticut, Storrs, Conn. 06268,
Raymond Costello, Grad. Student; Civ. Engrg., Univ. of Connecticut, Storrs, Conn. 06268.,
Mary A. Parese, Grad. Student; Civ. Engrg., Univ. of Connecticut, Storrs, Conn. 06268.,

Serial Information: Journal of the Environmental Engineering Division, 1981, Vol. 107, Issue 3, Pg. 581-590

Document Type: Journal Paper


Nitrogen was removed from septic tank effluent in a nitrification-denitrification system, using greywater as the organic carbon source in the denitrification step. A preliminary study showed greywater from a typical home contained abundant soluble carbon that biodegraded at the same rate as methanol, which, until this study, appeared to be the most promising source of organic carbon for such a system. A second laboratory study used aerobic sand column reactors to nitrify unfiltered septic tank effluent. Greywater, settled sewage, and methanol were added prior to the denitrification step to determine their suitability as possible sources of organic carbon. Greywater removed 70 percent of the available nitrate, methanol removed 83 percent, and settled sewage removed less than 5 percent. A field demonstration model was then built. Greywater is an acceptable carbon source for denitrification.

Subject Headings: Laboratory tests | Carbon compounds | Denitrification | Water reclamation | Septic tanks | Effluents | Carbon fibers | Sewage

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