Method for treating wastewater, and activator for treating wastewater

Patent metadata

Field	Value
Publication number	US-2017362109-A1
Application number	US-201715689745-A
Country	US
Kind code	A1
Filing date	Aug 29, 2017
Priority date	Apr 13, 2015
Publication date	Dec 21, 2017
Grant date	—

Abstract

A method for treating wastewater and an activator for treating wastewater that maximizes the utilization of microorganisms such as Bacillus bacteria in an activated sludge treatment of wastewater while minimizing treatment cost. In the method for treating wastewater, wastewater including organic matter is introduced into a treatment tank and the wastewater is subjected to an activated sludge treatment by microorganisms in the treatment tank, wherein an activator containing a component for activating the microorganisms is added to the wastewater to be subjected to the activated sludge treatment in the treatment tank; and at least 50% (by quantity) of the entirety of the activator has a particle size of less than 10 pm. Also provided is an activator therefor. The microorganisms preferably include Bacillus bacteria.

First claim

It is claimed:

1 . A method for treating wastewater in which wastewater including organic matter is introduced into a treatment tank and the wastewater is subjected to an activated sludge treatment by microorganisms in the treatment tank, the method for treating wastewater comprising:
adding an activator containing a component for activating Bacillus bacteria to the wastewater to be subjected to the activated sludge treatment in the treatment tank, the activator comprises a pulverized material of at least one selected from the group consisting of blast furnace slag, diatomaceous earth, perlite, and cement, and at least 50% (by quantity) of the entirety of the activator has a particle size of less than 10 μm.

2 . The method for treating wastewater according to claim 1 , wherein the activator is added to thereby increase activities of proteolytic enzyme and carbohydrate-degrading enzyme by the Bacillus bacteria.

3 . The method for treating wastewater according to claim 1 , wherein the activator includes a silicon compound.

4 . The method for treating wastewater according to claim 3 , wherein the activator also includes at least one selected from the group consisting of an iron compound, a magnesium compound, a calcium compound, and a manganese compound.

5 . The method for treating wastewater according to claim 3 , wherein the activator is used by having a solubilizer of a silicon compound additionally combined with the activator.

6 . The method for treating wastewater according to claim 5 , wherein the solubilizer includes a cationic polymer for suppressing polymerization of silicon and/or a silicon compound.

7 . An activator for use in a method for treating wastewater in which wastewater including organic matter is introduced into a treatment tank and the wastewater is subjected to an activated sludge treatment by microorganisms in the treatment tank, the activator comprising:
a component contained in the activator for activating Bacillus bacteria; and a pulverized material of at least one selected from the group consisting of blast furnace slag, diatomaceous earth, perlite, and cement, and at least 50% (by quantity) of the entirety of the activator has a particle size of less than 10 μm.

8 . The activator according to claim 7 , including a silicon compound as a component for activating the microorganisms.

9 . The activator according to claim 8 , further including at least one selected from the group consisting of an iron compound, a magnesium compound, a calcium compound, and a manganese compound as the component for activating the microorganisms.

10 . The activator according to claim 8 , used in combination with a solubilizer of a silicon compound.

11 . The activator according to claim 9 , used in combination with a solubilizer of a silicon compound.

12 . The activator according to claim 10 , wherein the solubilizer includes a cationic polymer for suppressing polymerization of silicon and/or a silicon compound.

13 . The activator according to claim 11 , wherein the solubilizer includes a cationic polymer for suppressing polymerization of silicon and/or a silicon compound.

14 . The method for treating wastewater according to claim 2 , wherein the activator includes a silicon compound.

15 . The method for treating wastewater according to claim 2 , wherein the activator also includes at least one selected from the group consisting of an iron compound, a magnesium compound, a calcium compound, and a manganese compound.

16 . The method for treating wastewater according to claim 4 , wherein the activator is used by having a solubilizer of a silicon compound additionally combined with the activator.

Assignees

• Fuji Electric Co Ltd

Inventors

• Taguchi Kazuyuki

Classifications

• B09B3/00

  Destroying solid waste or transforming solid waste into something useful or harmless · CPC title

• C02F3/006

  Regulation methods for biological treatment · CPC title

• C02F3/301

  Aerobic and anaerobic treatment in the same reactor · CPC title

• C02F11/00

  Treatment of sludge; Devices therefor · CPC title

• C12R1/07

  Chemistry & Metallurgy · mapped topic