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N I T R O G E N A N D P H O S P H O R U S R E M O V A L F R O M W A S T E W A T E R

PATENT ABSTRACTS

portion is introduced into the oxic treating zone, into which oxic zone oxygen-containing gas is admitted to effect oxygenation of the contents of that zone.

David Nicholas assigned to Air Products and Chemicals Inc

t i • ~ - - - -] " T -

. /

Wastewater is passed sequentially through an anaerobic treating zone and an oxic treating zone, followed by separation from the treated li- quor of a dense sludge containing activated bio- mass, a least part of which is recycled to provide the activated biomass employed in treating the influent wastewater. O f the part of the sludge so recycled a minor portion is introduced into the anaerobic treating zone for admixture with the wastewater influent and the remaining major

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P R O D U C T A N D P R O C E S S F O R S T I M U L A T I N G B A C T E R I A L A C T I O N I N A N A N A E R O B I C

D I G E S T I O N S Y S T E M

Robert J Seely assigned to American Genetics International Inc

A product and process for stimulating bacterial action in an anaerobic digestion system is dis- closed. The product includes an inhibitory ion regulating component and an inorganic pyro- phosphate containing compound. The process includes forming a mixture of the described pro- duct, and then adding an effective amount of the product mixture to the anaerobic digestion sys- tem to stimulate and enhance bacterial growth and metabolism therein.

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