||A study of nitrification and denitrification /
Mechalas, B. J. ;
Allen, II, Paul H. ;
Matyskiel, Walter W.
||Envirogenics Co., El Monte, Calif.
|| Advanced Waste Treatment Research Laboratory : For sale by the Supt. of Docs., U.S. Govt. Print. Off., Washington,
||FWQA-14-12-498; FWQA-17010-DRD; 04667,; 17010-DRD-07/70
Sewage--Purification--Biological treatment. ;
( Sewage treatment ;
( Chemical removal(Sewage treatment) ;
Biochemical oxygen demand ;
Reaction kinetics ;
Aerobic processes ;
Mathematical models ;
Tertiary sewage treatment ;
Chemical oxygen demand
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||ix, 90 pages : illustrations ; 28 cm.
A program to incorporate biological denitrification into a waste water treatment system was undertaken with the objective of developing a process that depends exclusively on the carbon compounds contained in the waste water to supply metabolic energy to the microflora. In the experimental program the incoming nitrogenous material was oxidized to nitrate in an aerobic phase and reduced to nitrogen gas in an anaerobic phase. Conditions for developing a nitrifying microflora were investigated using a primary waste water effluent as feed. Anaerobic batch experiments were carried out to determine if stored reserves could support denitrification. Under appropriate conditions almost 100% of the nitrates could be reduced. The effluent from the aerobic unit served as the feed for the anaerobic process. At appropriate intervals this situation was reversed by switching the airflows and feed sources. Over 95% of the waste water nitrogen in waste water was removed. Nitrate-nitrogen removal rates ranged from 0.600 to 1.00 mg/hr/g MLVS. A mathematical model was developed which described the response to cycled aerobic-anaerobic operation. The alternating cycle approach was shown to be an effective method for removing nitrogen from waste water. (Author)
"17010DRD07/70." Prepared for the Federal Water Quality Administration under contract #14-12-498. Includes bibliographical references (page 81). Microfiche.