EP0956270A1 - Procede de desinfection de l'eau - Google Patents

Procede de desinfection de l'eau

Info

Publication number
EP0956270A1
EP0956270A1 EP96940206A EP96940206A EP0956270A1 EP 0956270 A1 EP0956270 A1 EP 0956270A1 EP 96940206 A EP96940206 A EP 96940206A EP 96940206 A EP96940206 A EP 96940206A EP 0956270 A1 EP0956270 A1 EP 0956270A1
Authority
EP
European Patent Office
Prior art keywords
water
ofthe
value
added
hydrogen peroxide
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP96940206A
Other languages
German (de)
English (en)
Inventor
Lennart Olausson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Priority claimed from SE9504176A external-priority patent/SE9504176D0/xx
Priority claimed from SE9602284A external-priority patent/SE9602284D0/xx
Application filed by Individual filed Critical Individual
Publication of EP0956270A1 publication Critical patent/EP0956270A1/fr
Withdrawn legal-status Critical Current

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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • 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
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/42—Nature of the water, waste water, sewage or sludge to be treated from bathing facilities, e.g. swimming pools

Definitions

  • the invenuon relates to the water treatment technique and especially to a method of disinfecting water intended for baths, particularly for public baths, at which the water has a pH value >_7.8 before the disinfection.
  • the invention can also be used to disinfect drinking water.
  • the disinfectant that is used for bathwater and drinking water is chlorine or certain active chlorine compounds.
  • the chlorination is also used to facilitate the purification ofthe water by oxidation.
  • chlorine gas sodium hypochlorite, NaCIO, or calcium hypochlorite, Ca(ClO) 2 .
  • Either chlorine gas, sodium hypochlorite or calcium hypochlorite is used, an equilibrium is reached in the water between the reactive species hypochlorous acid, HC1O, and hypochlorite ions, CIO " , that both are so called free active chlorine.
  • chlorination has a number of negative side effects: undesirable organic chlorine compounds are formed when free active chlorine reacts with organic compounds in the water, the chlorine can have an irritating effect on sensitive persons and chlorine has an unpleasant smell. Furthermore the handling of chlorine or active chlorine compounds is very dangerous for the staff who operate the purification plant. Despite these disadvantages chlorination has been considered to be irreplaceable for d sinfection of bathwater and drinking water.
  • Chlorination has e. g. been combined with addition of oxidizing agents.
  • oxidizing agents e.g. ozone and hydrogen peroxide have been used in combination with chlorine dosage.
  • UV-radiation in combination with addition of chlorinating agents have been used.
  • the purpose ofthe invention is to offer a method to disinfect water that has enough capacity of disinfection, that does not have high installation and operating costs and that does not require any contribution of chlorine or active chlorine compounds.
  • This can be attained by the invention by adjusting the pH value to a value ⁇ 7.8, suitably ⁇ 7.6 and preferably ⁇ 7.5, and by adding hydrogen peroxide to the water in order to oxidize existing micro-organisms and other organic matter in the water at the mentioned lower pH value without presence of free active chlorine.
  • the hydrogen peroxide is added in at least stoichiometric proportion to oxidize existing micro-organisms and other organic matter in the water.
  • the pH value should not be lowered so much that the water gives an acid reaction.
  • the lower pH limit is therefore set to 7.0, preferably to 7.1.
  • the pH value should be adjusted to some value between 7.1 and 7.5, preferably between 7.3 and 7.4.
  • the pH value is suitably adjusted by adding CO 2 ⁇ carbonic acid.
  • the alkalinity ofthe water is kept at a value between 50 and 100, suitably at a value between 60 and 80 mg HCO 3 " / 1 water, in which case the method of the invention is used for disinfection of water in a swirnming-pool.
  • the pH value and the alkalinity can be adjusted to the desired levels by adjusted addition of CO 2 (herein is in the following also included carbonic acid) and H 2 O 2 , that preferably is added into a pipe parallel to the main pipe in a circular flowpath, that also includes the swimming-pool. If only CO 2 is added, the alkalinity expressed as the amount of HCO 3 " / 1 water decreases. On the other hand if both CO 2 and H 2 O 2 are added at the same time into the pipe, HCO 3 " will be produced, i.e. the alkalinity increases. For the best control and regulation of both pH value and alkalinity it is appropriate that CO 2 , H 2 O 2 and CO 2 + H 2 O are added at different periods that do not overlap.
  • a control sequence can thus comprise a first period when CO 2 but no H 2 O 2 is added to the pipe, a second period when H 2 O 2 but no CO 2 is added into the pipe and a third period when both CO 2 and H 2 O 2 are added into the pipe.
  • the invention refers to disinfection of water in baths
  • water is continuously lost by evaporation.
  • This water together with other water that can vanish or divert from the system, is compensated by fresh water.
  • fresh water contains metals which can be in a soluble state as metal ions or as complex ions. If these metals are not removed before fresh water is added into the water in the pool, the metals will gradually be accumulated in the water.
  • Some metals, as aluminium, copper, iron and manganese can have a great disturbing effect on the disinfecting process by stimulating the decomposition ofthe hydrogen peroxide, i.e. that it does not fulfil the purpose, or the amount of added H 2 O 2 has to increase considerably to have the desired purification effect.
  • incoming fresh water should be purified from such metals which can decompose the hydrogen peroxide.
  • the mcoming fresh water should be cleaned so that the water in the pool will contain maximum 0.20 ppm Al, preferably maximum 0.09 ppm AI maximum 0.10 ppm and preferably maximum 0.005 ppm of each ofthe metals Cu, Fe and Mn.
  • the purification ofthe incoming fresh water from the mentioned metals can be carried out by an ion exchanger.
  • the drawing shows schematically the water purification system for a swimming-pool that works in accordance with the method ofthe invention.
  • a swimming-pool is designated 1. From the bottom ofthe pool an outlet waterpipe 2 leads to a coarse screen 3. From the pool 1 also surface water is directed through a pipe 4 to a compensation tank 5 and from there through a pipe 6 to the aheady mentioned outlet pipe 2, after which the joined flows are directed to the coarse screen 3. Fresh water can be directed through a pipe 7 to the compensation tank 5.
  • the pipe 7 there are two ion exchange columns 30 and 31 connected in series of which one is an anion exchange column and the other a cation exchange column, to remove aluminium, copper, iron and manganese from the water.
  • the water is circulated further by means of a pump 10 to three filters 11, 12, 13 connected in parallel and through these. After the filters 11, 12, 13 the liquid flow is divided into two flows.
  • One by-pass that represents 5-25% ofthe total circulating flow is led through a branch pipe 14 while the main part is directed through a mainpipe 15 which is parallel to the branch pipe 14.
  • Both flows in the pipes 14 and 15 are joined in an inlet pipe 16, through which treated water is directed into the pool 1.
  • a very little flow is at the measuring points directed through a pipe 17 for analysis of H 2 O 2 in the measure equipment 18 and for analysis of pH in the measure equipment 19 and then back to outlet pipe 2.
  • the branch pipe 14 goes through a safety cabin 21.
  • this safety cabin there is one or several containers 22 containing H 2 O 2 .
  • hydrogen peroxide is dosed into the water in branch pipe 14 by means of a pump 32 which pumps hydrogen peroxide from the container 22 and directs it into the branch pipe 14 at a point in the safety cabin 21.
  • carbon dioxide is added to the water in the branch pipe 14 from one or several carbon dioxide bottles 24 via a pipe 25 with a valve 34.
  • the measurement test results ofthe H 2 O 2 and the pH registered by the measuring equipment 18 and 19, are processed in a computer 33 in accordance with a control program that has been programmed into the computer for controlling the pump 32 for supply of H 2 O 2 , as well as the valve 34 for supply of CO 2 to the branch pipe 14.
  • a control sequence can consist ofthe following parts. First the valve 34 is opened for adding of CO 2 and is kept open during a certain period of time, depending on pH value registered by the measuring equipment 19, after the vah/e 34 once again is closed at command from the computer 33. The pump 32 is during this first period inactive.
  • the pump 32 starts and a certain amount of H 2 O 2 is pumped into the pipe 14 from the bottle 22 depending on the content of H 2 O 2 registered in the measuring equipment 18 and in accordance with the program in the computer 33, after which the pump 32 is stopped once again.
  • the pump 32 is once again active and is pumping H 2 O 2 from the container 22 into the pipe 14, simultaneously as the valve 34 is open, so that also CO 2 is led into the pipe 14 to rise the alkalinity to the desired level.
  • the second and third period can follow directly after each other, i. e. the pump 32 has to work continuously during the mentioned second and third periods. It should be realized that this control sequence can be varied, so during certain control sequences only some ofthe mentioned periods are active.
  • the invention has been developed primarily for disinfecting water for public baths. Normally such water has a pH value over 8 and there are pH values right up to about pH 9.
  • the volume ofthe pool 1, see figure, was 30 m 3 .
  • the pH value was lowered by addition of carbonic acid, CO 2 . Before the adjustment of pH the water had a pH value of 8.6. Hydrogen peroxide was added in varying amounts as a disinfectant.
  • the invention is not limited to the use of CO 2 or carbonic acid to lower the pH-value. Other acids may probably also be used.
  • other oxidation agents e.g. ozone
  • chemicals directly to the swimming-pool 1, e.g. sodium bicarbonate to increase the alkalinity in the water in question, which does not contain active chlorine. This can simply be made by throwing the chemicals into the pool at the end ofthe day to let it mix and work during the night.
  • the alkalinity is at alevel corresponding to 60 and 80 mg HCO 3 71 water.

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)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)

Abstract

L'invention concerne un procédé de désinfection d'une eau ayant un pH ≥7,8, caractérisé par le fait que l'on règle le pH sur une valeur inférieure à 7,8 et qu'à cette valeur de pH abaissée, on ajoute du peroxyde d'hydrogène à l'eau afin d'oxyder, en l'absence de chlore libre actif, tous les micro-organismes et autres matières organiques présents dans l'eau.
EP96940206A 1995-11-23 1996-11-20 Procede de desinfection de l'eau Withdrawn EP0956270A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
SE9504176 1995-11-23
SE9504176A SE9504176D0 (sv) 1995-11-23 1995-11-23 Sätt att desinfektera vatten
SE9602284A SE9602284D0 (sv) 1996-06-10 1996-06-10 Sätt att desinfektera vatten
SE9602284 1996-06-10
PCT/SE1996/001506 WO1997019025A1 (fr) 1995-11-23 1996-11-20 Procede de desinfection de l'eau

Publications (1)

Publication Number Publication Date
EP0956270A1 true EP0956270A1 (fr) 1999-11-17

Family

ID=26662427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96940206A Withdrawn EP0956270A1 (fr) 1995-11-23 1996-11-20 Procede de desinfection de l'eau

Country Status (6)

Country Link
EP (1) EP0956270A1 (fr)
JP (1) JP2000500395A (fr)
AU (1) AU702884B2 (fr)
CA (1) CA2236375A1 (fr)
NO (1) NO982317L (fr)
WO (1) WO1997019025A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3574400B2 (ja) 2000-12-04 2004-10-06 株式会社 高千穂 建物の雨水利用システム
ES2528396B1 (es) * 2013-08-07 2015-11-19 Metalast S.A.U. Sistema de inyección de dióxido de carbono para el tratamiento de agua
ES2434140B1 (es) * 2013-08-07 2014-10-07 Metalast S.A.U. Sistema de suministro de dióxido de carbono para el tratamiento de agua

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH605421A5 (en) * 1976-04-02 1978-09-29 Schweizerische Sodafabrik Disinfecting water using hydrogen peroxide
DE2852475C2 (de) * 1978-12-05 1980-05-22 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt Verfahren zur automatisch steuerbaren Entgiftung von Nitritionen enthaltenden Abwässern
FR2671548B1 (fr) * 1991-01-16 1995-03-24 Omnium Traitement Valorisa Procede et dispositif d'oxydation des micropolluants organiques dans les eaux par le couple 03/h2o2.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9719025A1 *

Also Published As

Publication number Publication date
CA2236375A1 (fr) 1997-05-29
NO982317D0 (no) 1998-05-20
AU702884B2 (en) 1999-03-11
WO1997019025A1 (fr) 1997-05-29
NO982317L (no) 1998-05-20
JP2000500395A (ja) 2000-01-18
AU7715096A (en) 1997-06-11

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