Denitrification promoter and a method of water treatment using the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorKoichiro Murasawa
Life of this patent
Estimating the term…
Abstract
To provide technology in denitrification promoters for typical use in wastewater treatment and methods of water treatment using such denitrification promoters, which allows nitrification and denitrification to be accomplished simultaneously in water treatment facilities using a single aerobic tank without continuous addition of methanol or other hydrogen donors that has caused difficulties in the prior art. A straight-chained saturated monocarboxylic acid having at least 6 carbon atoms or a primary alcohol having at least 12 carbon atoms is used as a main component of the denitrification promoter, which may be shaped into particles no larger than 100 mm and added into an aerobic tank, an anaerobic tank or a settling tank.
Claims29
A solid denitrification promoter, wherein the denitrification promoter comprises a straight-chained saturated monocarboxylic acid having 6 or more carbon atoms and a carrier carrying said monocarboxylic acid to support the denitrification promoter.
A solid denitrification promoter, wherein the solid denitrification promoter comprises an alcohol having 12 or more carbon atoms and a carrier carrying said alcohol to support the denitrification promoter.
A method of water treatment, comprising the step of adding a denitrification promoter comprising a carboxylic acid having 6 or more carbon atoms into any one of an aerobic tank, an anaerobic tank and a settling tank, the denitrification promoter being added in an amount effective to facilitate substantial reduction in total nitrogen content of the water being treated in the tank.
A method of water treatment, wherein a denitrification promoter comprising any one of (1) a carboxylic acid having 6 or more carbon atoms or (2) an alcohol having 12 or more carbon atoms is added into any one of an aerobic tank, an anaerobic tank and a settling tank, wherein a size of the particles is defined so that an anaerobic environment can locally be created to favor the progress of denitrifying reactions by local pressure drop due to “Bernouilli's principle”, caused by a flow of aerating gas or water streams at the interface between the carboxylic acid or alcohol and the water, caused by movement of the particles in the tank to which the particles are added.
A method of water treatment in which a bar or a rod of denitrification promoter comprising any one of (1) a carboxylic acid having 6 or more carbon atoms or (2) an alcohol having 12 or more carbon atoms is added into any one of an aerobic tank, an anaerobic tank and a settling tank, wherein the denitrification promoter is shaped so that an anaerobic environment can locally be created to favor the progress of denitrifying reactions by local pressure drop due to “Bernouilli's principle”, caused by a flow of aerating gas or water streams at the interface between the carboxylic acid or alcohol and the water.
A method of water treatment in which a bar or a rod of denitrification promoter comprising any one of (1) a carboxylic acid having 6 or more carbon atoms or (2) an alcohol having 12 or more carbon atoms is added into any one of an aerobic tank, an anaerobic tank and a settling tank, wherein the bar or rod has at least one convex or concave surface formed so that an anaerobic environment can locally be created to favor the progress of denitrifying reactions by local pressure drop due to “Bernouilli's principle”, caused by a flow of aerating gas or water streams at the interface between the carboxylic acid or alcohol and the water.
A method of water treatment, wherein a denitrification promoter comprising any one of (1) a carboxylic acid having 6 or more carbon atoms or (2) an alcohol having 12 or more carbon atoms is added into any one of an aerobic tank, an anaerobic tank and a settling tank, wherein the denitrification promoter is immobilized on at least one of (1) a string, (2) a woven fabric sheet, or (3) a nonwoven fabric sheet, the denitrification promoter being immobilized so that an anaerobic environment can locally be created to favor the progress of denitrifying reactions by local pressure drop due to “Bernouilli's principle”, caused by a flow of aerating gas or water streams at the interface between the carboxylic acid or alcohol and the water.
A method of water treatment, comprising the step of adding a denitrification promoter comprising any one of (1) a carboxylic acid having 6 or more carbon atoms or (2) an alcohol having 12 or more carbon atoms into an aerobic tank, the denitrification promoter being added in an amount effective to facilitate substantial reduction in total nitrogen content of the water being treated in the tank, and the denitrification of the treatment water in the aerobic tank occurs simultaneously with nitrification of said treatment water in said aerobic tank.
A method of water treatment, comprising the step of adding a denitrification promoter comprising any one of (1) a carboxylic acid having 6 or more carbon atoms or (2) an alcohol having 12 or more carbon atoms into any one of an aerobic tank and a settling tank, the denitrification promoter being added in an amount effective to facilitate substantial reduction in total nitrogen content of the water being treated in the tank.
Dependencies are inferred from the claim text.