Masters Theses


"The facultative anaerobic submerged filter is a plug flow, packed bed, column type reactor in which the facultative microorganisms responsible for nitrate reduction are attached to the filter media. The objective of this study was to evaluate filter performance and the kinetic equations of the process under variable conditions of flow rate, nitrate nitrogen concentration, and organic loading.

Two 0.5 cu ft (14.25 1) laboratory filters were operated for 144 days at 35°C using a synthetic waste as the substrate. Filter media consisted of smooth quartzite stone, 1 to 1.5 in. (2.54-3.82 cm) in diameter. Each filter had a porosity of 0.47 and a liquid volume of 0.22 cu ft (6.25 1).

By varying the nitrate nitrogen concentration from 3.5 to 70 mg/1 and the detention time from 1 to 4 hr, a range of nitrate loadings from 9 to 735 g NO3-N/cu m/day was achieved. Filter performance was determined by monitoring nitrate nitrogen, COD, and suspended solids.

The facultative submerged filter was found to be an effective method for denitrification of high nitrate content wastes. Nitrate removals were consistently higher than 90 percent, averaging 97 percent. COD removals were also consistently, high averaging 87 percent"--Abstract, page ii.


Modesitt, Donald E.

Committee Member(s)

Jennett, J. Charles
Cuthbertson, G. Raymond


Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering


United States. Environmental Protection Agency. Office of Water Programs


This study was supported in part by Professional Training Grant No. T-900121-02&03 from the Office of Water Programs, Environmental Protection Agency.


University of Missouri--Rolla

Publication Date



viii, 80 pages

Note about bibliography

Includes bibliographical references (pages 77-79).


© 1975 Dominic Joseph Grana, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Thesis Number

T 4049

Print OCLC #


Electronic OCLC #


Link to Catalog Record

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