WO1997005067A1 - Technique combinee de desinfection de liquides - Google Patents

Technique combinee de desinfection de liquides Download PDF

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Publication number
WO1997005067A1
WO1997005067A1 PCT/US1996/012174 US9612174W WO9705067A1 WO 1997005067 A1 WO1997005067 A1 WO 1997005067A1 US 9612174 W US9612174 W US 9612174W WO 9705067 A1 WO9705067 A1 WO 9705067A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
process according
electrodes
processing chamber
field
Prior art date
Application number
PCT/US1996/012174
Other languages
English (en)
Inventor
Helmut I. Milde
Sanborn F. Philp
Original Assignee
Milde Helmut I
Philp Sanborn F
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Milde Helmut I, Philp Sanborn F filed Critical Milde Helmut I
Priority to US08/983,533 priority Critical patent/US6039883A/en
Publication of WO1997005067A1 publication Critical patent/WO1997005067A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection

Definitions

  • This invention relates to the disinfection of liquids, especially those containing microbes, and combines the use of chemical disinfectants with the application of high potential gradients to a liquid medium containing microbes.
  • the liquid, contaminated with microbes is contained within a processing chamber.
  • electrodes which themselves constitute part of the envelope of the contained volume of liquid to be processed.
  • all fluid in the chamber - or all fluid passing through the chamber - is subjected to the high potential gradient, which is applied as a sequence of pulses.
  • the applied potential gradients have an effect on the microbes which persists for a significant period of time after the application of the gradient has ceased - or after the microbe has passed out of the chamber where the gradients are applied.
  • Fig. 1 is a somewhat diagrammatic view of the process steps of the invention.
  • FIG. 1 therein is shown an apparatus for carrying out the process of this invention and intended for the disinfection of a continuously flowing stream of liquid.
  • This apparatus includes a means of mixing, which incorporates a valve and pipework, which permits a controllable stream of dilute disinfectant to flow continuously into the volume wherein mixing with the fluid occurs.
  • the processing chamber contains an arrangement of electrodes such that the liquid to be processed is subjected to an electric field resulting from a potential difference maintained between various of these electrodes.
  • the liquid enters first at an inlet pipe to the means of mixing, passes through this part of the apparatus, and then exits through a short pipe connecting into the electric field processing chamber.
  • Baffles are provided in the mixing region (or the contents of the region may be continuously stirred) and the location of inlet and outlet are such that every element of input liquid spends a time in the mixing means which is approximately equal to the volume of this space divided by the volumetric rate of flow.
  • the liquid passes to the electric field processing chamber where high voltage pulses, applied at a certain rate across the electrodes, cause pulsed gradients to be induced in the liquid.
  • the effectiveness of the subject invention is exemplified by the following experiments, in which chlorination and the pulsed gradient process are first applied separately and then combined into a single process. In each case, a liquid stream contaminated with coliform bacteria was passed through the apparatus. Samples were taken from the input stream and from the output stream for bacteriological analysis . Three different cases were studied:
  • a mixing tank was filled with several gallons of contaminated liquid and a dilute solution of hypochorite was introduced into the tank so that the added hypochlorite was in a proportion of 1.9 parts per million to the liquid volume in the tank.
  • the residence time of the hypochlorite in the tank was 10 minutes. After this period, the liquid was dechlorinated with sodium bisulfite.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

Divers désinfectants chimiques, comme le chlore, ont une grande aptitude à la destruction ou à l'annihilation des microbes mais peuvent produire des sous-produits de désinfection dangereux. Ils peuvent également entraîner une contamination résiduelle par eux-mêmes. L'application de gradients de potentiel élevé à un milieu liquide renfermant des microbes a elle aussi un pouvoir désinfectant puissant. La combinaison de désinfectants chimiques et d'un processus électrique permet d'obtenir une technique combinée de grande efficacité, selon laquelle le processus électrique agit avec une plus grande efficacité tandis que les quantités nécessaires de désinfectant chimique sont considérablement moindres.
PCT/US1996/012174 1995-07-27 1996-07-25 Technique combinee de desinfection de liquides WO1997005067A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US08/983,533 US6039883A (en) 1995-07-27 1996-07-25 Compound method for disinfection of liquids

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US155195P 1995-07-27 1995-07-27
US60/001,551 1995-07-27

Publications (1)

Publication Number Publication Date
WO1997005067A1 true WO1997005067A1 (fr) 1997-02-13

Family

ID=21696633

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/012174 WO1997005067A1 (fr) 1995-07-27 1996-07-25 Technique combinee de desinfection de liquides

Country Status (1)

Country Link
WO (1) WO1997005067A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2792308A1 (fr) * 1999-04-15 2000-10-20 Electricite De France Procede d'elimination des protozoaires, notamment des amibes libres d'un flux aqueux colonise, procede de traitement d'un flux aqueux par electropulsation et son application pour eliminer des protozoaires
WO2003070026A1 (fr) * 2002-02-25 2003-08-28 Dsm Ip Assets B.V. Conservation de liquides

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4384943A (en) * 1980-09-11 1983-05-24 The University Of Virginia Alumni Patents Foundation Fluid treatment
US4492618A (en) * 1979-03-22 1985-01-08 Bernd Eder Method of disinfecting water, in particular swimming pool water
US4769119A (en) * 1986-03-24 1988-09-06 Waterdynamics (Proprietary) Limited Water treatment
US5130032A (en) * 1989-10-10 1992-07-14 Sartori Helfred E Method for treating a liquid medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4492618A (en) * 1979-03-22 1985-01-08 Bernd Eder Method of disinfecting water, in particular swimming pool water
US4384943A (en) * 1980-09-11 1983-05-24 The University Of Virginia Alumni Patents Foundation Fluid treatment
US4769119A (en) * 1986-03-24 1988-09-06 Waterdynamics (Proprietary) Limited Water treatment
US5130032A (en) * 1989-10-10 1992-07-14 Sartori Helfred E Method for treating a liquid medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2792308A1 (fr) * 1999-04-15 2000-10-20 Electricite De France Procede d'elimination des protozoaires, notamment des amibes libres d'un flux aqueux colonise, procede de traitement d'un flux aqueux par electropulsation et son application pour eliminer des protozoaires
WO2000062821A1 (fr) * 1999-04-15 2000-10-26 Electricite De France (Service National) Procede d'elimination des protozoaires, notamment des amibes libres d'un flux aqueux colonise, procede de traitement d'un flux aqueux par electropulsation et son application pour eliminer des protozoaires
WO2003070026A1 (fr) * 2002-02-25 2003-08-28 Dsm Ip Assets B.V. Conservation de liquides

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