Purification method for water, purification device for water, and use of said purification device at low water temperature

Patent metadata

Field	Value
Publication number	US-11185059-B2
Application number	US-202016888915-A
Country	US
Kind code	B2
Filing date	Jun 1, 2020
Priority date	Dec 7, 2017
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

Provided is a purification method for water to be used for culture of an aquatic organism, wherein the method includes a nitrification step of oxidizing ammonia to nitric acid using a nitrifying bacterium adhering to a base material containing an alkaline earth metal, and a denitrification step of reducing nitric acid to nitrogen using a denitrifying bacterium adhering to a base material containing a biodegradable resin which has a structural unit derived from dicarboxylic acid.

First claim

The invention claimed is:

1. A purification method for water, comprising
oxidizing ammonia in water to nitric acid with a nitrifying bacterium adhered to a base material comprising an alkaline earth metal, and
reducing the nitric acid in the water to nitrogen with a denitrifying bacterium adhered to a base material comprising a biodegradable resin, which has a structural unit derived from dicarboxylic acid.

2. The purification method for water according to claim 1 , wherein the biodegradable resin at least two structural units derived from dicarboxylic acid.

3. The purification method for water according to claim 1 , wherein the biodegradable resin is exposed to the atmosphere.

4. The purification method for water according to claim 3 , wherein the biodegradable resin is exposed to the atmosphere via a siphon.

5. The purification method for water according to claim 1 , wherein the temperature of the water is not more than 18° C.

6. The purification method for water according to claim 1 , wherein the water is suitable to culture an aquatic organism.

7. The purification method for water according to claim 6 , wherein the temperature of the water to be purified is at a temperature of not more than 18° C. and the aquatic organism is a fish of the Salmonidae family.

8. The purification method for water according to claim 1 , wherein the alkaline earth metal is calcium and the biodegradable resin is at least one of polybutylene succinate, poly(butylene succinate/adipate) (PBSA), and poly(butylene succinate/carbonate).

9. A purification apparatus configured to purify water comprising
a base material comprising an alkaline earth metal, upon which a nitrifying bacterium that oxidizes ammonia to nitric acid can grow, and
a base material comprising a biodegradable resin, which has a structural unit derived from dicarboxylic acid, upon which a denitrifying bacterium that reduces nitric acid to nitrogen can grow.

10. A method of purifying water, comprising providing water from an aquatic organism culture to the purification apparatus according to claim 9 and wherein the water has a temperature of not more than 18° C.

11. The purification apparatus according to claim 9 , wherein the water is suitable to culture an aquatic organism.

Assignees

• Mitsubishi Chem Corp

Inventors

• Kawasaki Tetsuya
• Ogawa Jun
• Ando Akinori
• Ando Daisei
• Yasutomi Ryohei
• Misaka Naoyuki

Classifications

• C02F3/303

  characterised by the nitrification · CPC title

• C02F3/305

  characterised by the denitrification · CPC title

• A01K63/04 Primary

  Arrangements for treating water specially adapted to receptacles for live fish · CPC title

• C02F3/10

  Packings; Fillings; Grids (packing elements in general B01J19/30, B01J19/32) · CPC title

• C02F2103/20

  from animal husbandry · CPC title