Browse Prior Art Database

Contact Column for Denitrification

IP.com Disclosure Number: IPCOM000078658D
Original Publication Date: 1973-Feb-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Driscoll, ED: AUTHOR

Abstract

This contact denitrification column allows reduction of reactor size and eliminates operating problems inherent with other related systems.

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Contact Column for Denitrification

This contact denitrification column allows reduction of reactor size and eliminates operating problems inherent with other related systems.

It has been previously-established that an active mass of biological organisms, operating in an appropriate environment, will convert soluble nitrate salts to elemental nitrogen, which will be eliminated from the system as innocuous nitrogen gas. Effective operation requires either absence of, or low concentrations of, dissolved oxygen, the presence of a source of organic carbon for the organisms in appropriate ratio to the nitrate concentration (commonly supplied by methanol or similar material), and adequate contact between the solution to be processed and the active mass of organisms.

A contact column 1 of suitable diameter and length is partially filled with a granular contacting media 2, retained between two screens 3. No reliance is placed on the biological film on media particles to effect the desired treatment. Instead, the suspended mass of organisms is utilized as in a stirred reactor. In this case, the active mass is retained in the void spaces of the contact column, which are obtained by the use of relatively coarse particles of about 1/2 to 3/4 inch diameter or greater. Although any material of suitable durability, rigidity and shape may be used, the preferred composition is a light material with low density such as a polyethylene foam or similar material. Light weight simplifies handling and loading of the column, r...