Water treatment system

Patent metadata

Field	Value
Publication number	US-2016115055-A1
Application number	US-201414893731-A
Country	US
Kind code	A1
Filing date	Jul 1, 2014
Priority date	Jul 3, 2013
Publication date	Apr 28, 2016
Grant date	—

Abstract

This water treatment system is provided with: a reverse osmosis membrane device; a biofilm treatment device that has a carrier, on a surface of which is formed a biofilm, and that treats water to be treated before the water to be treated is transmitted through the reverse osmosis membrane device; and at least one of a water to be treated stoppage period circulation means and a water to be treated stoppage period supply means that are driven when the intake of new water to be treated is stopped. The water to be treated stoppage circulation means supplies and circulates water to be treated from a water to be treated discharge outlet side of the biofilm treatment device to a water to be treated supply port side. The water to be treated stoppage period supply means supplies new water to be treated to the biofilm treatment device.

First claim

1 - 6 . (canceled)

7 . A water treatment system comprising a reverse osmosis membrane device configured to separate water to be treated into concentrated water having high solute concentration and fresh water, the water treatment system comprising:
a biofilm treatment device comprising a carrier having biofilm formed on a surface thereof and configured to treat the water to be treated before passing through the reverse osmosis membrane device; a water to be treated stoppage period circulation device operated when intake of new water to be treated is stopped and configured to supply and circulate the water to be treated from a discharge port of the water to be treated side of the biofilm treatment device toward a supply port of the water to be treated or from the supply port of the water to be treated side toward the discharge port of the water to be treated side; and a water to be treated stoppage period supply device configured to supply the new water to be treated to the biofilm treatment device.

8 . The water treatment system according to claim 7 , further comprising a monitoring unit configured to monitor ingredients in the water to be treated consumed by the biofilm of the biofilm treatment device.

9 . The water treatment system according to claim 7 , further comprising a control unit configured to control operation and stoppage of at least one of the water to be treated stoppage period circulation device and the water to be treated stoppage period supply device.

10 . The water treatment system according to claim 8 , further comprising a control unit configured to control operation and stoppage of at least one of the water to be treated stoppage period circulation device and the water to be treated stoppage period supply device.

11 . The water treatment system according to claim 7 , further comprising an oxygen nutriment supply unit configured to selectively supply a gas including oxygen and a nutriment of a microorganism that forms the biofilm to at least one of water to be treated circulated by the water to be treated stoppage period circulation device and new water to be treated supplied by the water to be treated stoppage period supply device when at least one of the water to be treated stoppage period circulation device and the water to be treated stoppage period supply device is operated.

12 . The water treatment system according to claim 8 , further comprising an oxygen nutriment supply unit configured to selectively supply a gas including oxygen and a nutriment of a microorganism that forms the biofilm to at least one of water to be treated circulated by the water to be treated stoppage period circulation device and new water to be treated supplied by the water to be treated stoppage period supply device when at least one of the water to be treated stoppage period circulation device and the water to be treated stoppage period supply device is operated.

13 . The water treatment system according to claim 9 , further comprising an oxygen nutriment supply unit configured to selectively supply a gas including oxygen and a nutriment of a microorganism that forms the biofilm to at least one of water to be treated circulated by the water to be treated stoppage period circulation device and new water to be treated supplied by the water to be treated stoppage period supply device when at least one of the water to be treated stoppage period circulation device and the water to be treated stoppage period supply device is operated.

14 . The water treatment system according to claim 11 , wherein the oxygen nutriment supply unit supplies the gas including oxygen from a lower side of the discharge port of the water to be treated side of the biofilm treatment device.

15 . The water treatment system according to claim 12 , wherein the oxygen nutriment supply unit supplies the gas including oxygen from a lower side of the discharge port of the water to be treated side of the biofilm treatment device.

16 . The water treatment system according to claim 13 , wherein the oxygen nutriment supply unit supplies the gas including oxygen from a lower side of the discharge port of the water to be treated side of the biofilm treatment device.

17 . The water treatment system according to claim 11 , wherein a supply amount of the new water to be treated supplied by the water to be treated stoppage period supply device and a supply amount of the gas including oxygen and the nutriment of the microorganism selectively supplied by the oxygen nutriment supply unit are controlled based on a monitoring result by the monitoring unit.

18 . The water treatment system according to claim 14 , wherein a supply amount of the new water to be treated supplied by the water to be treated stoppage period supply device and a supply amount of the gas including oxygen and the nutriment of the microorganism selectively supplied by the oxygen nutriment supply unit are controlled based on a monitoring result by the monitoring unit.

Assignees

• Mitsubishi Heavy Ind Ltd
• Aqua Systems Ltd
• Naikai Salt Ind Co Ltd

Inventors

• Hashimoto Yuta
• Iwahashi Hideo
• Matsui Katsunori
• Tokunaga Kiichi
• Yasunaga Takeshi
• Tabata Masayuki
• Ito Yoshiaki
• Takeuchi Kazuhisa
• GOUDA Yasuhide
• Kishi Masahiro

Classifications

• C02F2301/046

  Recirculation with an external loop · CPC title

• C02F1/76

  with halogens or compounds of halogens {(C02F1/4674 takes precedence)} · CPC title

• C02F3/1278

  Provisions for mixing or aeration of the mixed liquor · CPC title

• C02F2305/06

  Nutrients for stimulating the growth of microorganisms · CPC title

• C02F2209/04

  Oxidation reduction potential [ORP] · CPC title