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WO2006011846A1 - Procede est dispositif de purification de l'eau brute - Google Patents

Procede est dispositif de purification de l'eau brute Download PDF

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Publication number
WO2006011846A1
WO2006011846A1 PCT/SE2005/001180 SE2005001180W WO2006011846A1 WO 2006011846 A1 WO2006011846 A1 WO 2006011846A1 SE 2005001180 W SE2005001180 W SE 2005001180W WO 2006011846 A1 WO2006011846 A1 WO 2006011846A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
raw water
flotation tank
mixture
agents
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.)
Ceased
Application number
PCT/SE2005/001180
Other languages
English (en)
Inventor
Bert Gustafsson
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.)
B G Consulting HB
Original Assignee
B G Consulting HB
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 B G Consulting HB filed Critical B G Consulting HB
Publication of WO2006011846A1 publication Critical patent/WO2006011846A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/12—Halogens or halogen-containing compounds
    • C02F2101/14—Fluorine or fluorine-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • 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
    • C02F2303/16—Regeneration of sorbents, filters

Definitions

  • the present invention relates to a method and an ap ⁇ paratus for purification of ground water and surface water to the quality of drinking water.
  • floccu- lants As to surface water, generally some sort of floccu- lants is added to be able to precipitate the contamina- tions, whereupon the floccules are removed through some sort of filtering process.
  • flotation is used as a first step of removing the contaminations of the coarse particulate matter in the water. In this way it is possible to prolong the operating lifetime of the fil ⁇ ter, i.e. reflushing of the filter may be performed less often.
  • a filter of sand is not a sufficiently effective barrier when purifying water with high amounts of fluoride or heavy metals.
  • the sand filter has to be re- placed with a filter membrane, which allows particles with sizes less than 0.05 microns to pass.
  • the object of the present invention is to provide a method for purification of water, in which the problems with for example reduction of fluorides has been mitigated.
  • a method of pu ⁇ rifying raw water comprising: supplying raw water to be purified under pressure from a source of water; adding pressurized air and possible further agents into the pres ⁇ surized raw water, to obtain a mixture with the raw water for oxidizing contaminants of the water and for forming bubbles of air in the mixture; passing the mixture to a flotation tank under releaved pressure, whereby the air bubbles expand and flotate possible floccules and particles to the surface of the flotation tank for removal, and pass ⁇ ing the water through a filter means to obtain purified wa ⁇ ter.
  • the method may further comprise one or several of the following steps: adding a surplus of pressurized air; mix- ing said pressurized water and pressurized air in a agita ⁇ tion chamber, such as a cyclone device, in order to form a large amount of micro bubbles; maintaining said pressurized mixture in a pressure tank for a predetermined time period in order to promote oxidation of possible contaminants; re- leaving the pressure before entering the mixture in the flotation tank, such as by means of valves; passing air bubbles along an outer membrane surface of said filters, said membrane surface being arranged vertically, for remov- ing contaminants from the outer surface of the membrane; back flushing said filters intermittently; adjusting the pH in the flotation tank; and removing surface water and/or bottom water from the flotation tank, for adjusting the concentration of contaminants and possible further agents in the flotation tank.
  • the raw water may be surface water or ground water.
  • the further agents may be selected from the group comprising: chemical oxidizing agents, floccula- tion agents, aluminium particles and combinations thereof.
  • an apparatus for purifying raw water comprising: a source for raw water to be purified under pressure; a source for pressurized air and possible further agents to be added into the pressur ⁇ ized raw water, to obtain a mixture with the raw water for oxidizing contaminants of the water and for forming bubbles of air in the mixture; a valve means for releaving or de ⁇ creasing the pressure when passing the mixture to a flota ⁇ tion tank, whereby the air bubbles expand and flotate pos ⁇ sible floccules and particles to the surface of the flota ⁇ tion tank for removal, and a filter means for passing the water to obtain purified water.
  • the apparatus may further comprise one or several of the following: an agitation chamber, such as cyclone device, in which added surplus of pressurized air and said pressurized water are mixed in or ⁇ der to form a large amount of micro bubbles; a pressure tank for maintaining said pressurized mixture during a pre- determined time period in order to promote oxidation of possible contaminants; an air supply for passing air bub ⁇ bles along an outer membrane surface of said filters, said membrane surface being arranged vertically, for removing contaminants from the outer surface of the membrane; a pump for back flushing said filters intermittently; a pH meter and a control device for adjusting the pH in the flotation tank; water removal means for removing surface water and/or bottom water from the flotation tank, for adjusting the concentration of contaminants and possible further agents in the flotation tank.
  • the raw water may be surface water or ground water.
  • the further agents may be selected from the group comprising: chemical oxidizing agents, potassium permanganate, flocculation agents, aluminium particles and combinations thereof.
  • Fig. 1 is a schematic view of an arrangement for pu ⁇ rification of water according to the invention.
  • Fig. 1 discloses an apparatus for purification of raw water, such as surface water or ground water.
  • the raw water may come from a lake, river, wetland, and a dug well or a deep drilled well, alternatively.
  • the water is pumped by a first pump Pl, with a pressure of at least 4 bars, to a pressure tank or chamber A, in which oxidation and maturing may take place.
  • a surplus or excess of air is supplied by an air com ⁇ pressor Ll from an inlet of air.
  • Further agents may be added, such as a possible complementing oxidizing agent Ml and possible flocculants for e.g. heavy metals, fluorides and humus M2 and M3. These agents and the air are supplied under pressure to the raw water.
  • a mixer B such as a cyclone device
  • a mixer B such as a cyclone device
  • the heavy mixing en ⁇ tails that the water will contain a large amount of air, comprising millions of microscopically small air bubbles.
  • Part of the oxygen in these air bubbles is consumed during the fast oxidation of iron and manganese into the pressur ⁇ ized oxidation and maturing chamber A.
  • the required pre ⁇ determined dwell time in the pressure chamber A may nor ⁇ mally be less than 3 minutes. If an air cushion is formed at the top of , the pres ⁇ sure chamber A, such air is vented or released through a ventilating valve 0 of the chamber A.
  • the oxidized water is passed to a flotation chamber C.
  • the water enters the flo- tation tank through nozzles E also comprising releave valves, which lowers the pressure to substantially atmos ⁇ pheric pressure.
  • the microscopically small air bubbles will rapidly expand when the pressure is releaved.
  • the expanded air bubbles will attach to the surface of any particulate matter or floccules present in the water and rise to the surface of the flotation chamber C bringing with it the contaminants. In this way, an effective flotation is pro- vided.
  • the floccules and other particulate contaminations present in the water are lifted by the expanding air bub ⁇ bles to the surface from where they are simply removed by scraping or overflow over an edge.
  • the water level in the flotation chamber C is periodic raised, where- upon the surface water with the contaminations spills over and flows via over flow flutes D and pipes out through the drain.
  • the pressure chamber further comprises several large filter devices F having filter membranes with a small cut ⁇ off size, in the order of 0.05 microns.
  • a pump P2 is con- nected to the filtration side of the membranes and sucks the water through the membranes to obtain highly purified water free from contaminants of all types.
  • the filters are arranged vertically, with an entrance opening at the bottom.
  • the water passes through the mem- branes of the filters and is collected at the top of the filters.
  • the pressure at the top of the filters is con ⁇ trolled by the pump and the flow of purified water re ⁇ quired, but may be 0.3 bar below atmospheric pressure or even lower.
  • the flotation nozzles E are located higher than the entrance openings G of the filter elements, which means that the filtering elements F will be protected from being reached by most of the floccules and other particulate con ⁇ taminations.
  • filtering elements F is kept free from any contaminant by means of an air diffuser H, which is located immediate beneath each filtering ele ⁇ ment F and emits a continuous curtain of air bubbles, which touch the wall of the filtering element and dislocate par- tides and contaminants to the surface of the water in the flotation chamber C, which counteract and prevents clogging of the filter elements F.
  • an air diffuser H which is located immediate beneath each filtering ele ⁇ ment F and emits a continuous curtain of air bubbles, which touch the wall of the filtering element and dislocate par- tides and contaminants to the surface of the water in the flotation chamber C, which counteract and prevents clogging of the filter elements F.
  • the pump P2 which is self-priming, sucks water from the combined flotation and filtering chamber C through the filtering elements F, whereby particles, which are larger than 0.05 microns and any bacteria and virus stay in the flotation chamber.
  • the filter has an exclusion size of about 0.05 microns, meaning that only particles and matter smaller than 0.05 microns can pass the filter membranes. This excludes all bacteria and most viruses.
  • the surface area or size of the filter is dimensioned so that a suffi ⁇ cient operation time is obtained, whereupon the filters are reconditioned by passing pure water in the opposite direc ⁇ tion.
  • the purified water, which passes through the filter ⁇ ing membrane F, is pumped to a reflushing reservoir J, from where it is delivered to some sort of water reservoir and further on to a drinking water supply.
  • the reflushing chamber is always immediately filled with water when the pump P2 is running, since the purified water spills over from the reflushing reservoir J.
  • the amount of aluminium and other contaminants at the outside of the filtering barrier F may be held at a suit ⁇ able level to provide a maximum binding effect of e.g. fluoride to aluminium particles, which are floating in the flotation chamber C, by controlling the drain from the flo ⁇ tation chamber C of surface water, trough the flow flutes D, as well as bottom water, through the drain valve I.
  • the pH is controlled and adjusted in the flota- tion chamber by a pH probe Nl, which transmit a signal to the control and regulating centre N2, which in turn con ⁇ trols the dosage pump N3.
  • the pH-adjusting agent is added before the flotation chamber C, but may as well be added directly to the flotation chamber C at a low pressure.
  • the filtering elements F are reflushed regularly by passing pure water from the reflushing reservoir J the op ⁇ posite way through the filtering elements F by means of the backflushing pump P3.
  • the different further agents are shown to be added in a pipe or tube connecting the pump Pl with the cyclone de- vice B. However, the further agents may as well be added before the pump Pl or alternatively after the cyclone de ⁇ vice B.
  • the flocculation agent may be added still later in the process, such as shortly before the flotation chamber C.
  • the pump P2 cannot generate a very low pres ⁇ sure, the flow will decrease as the filters are blocked by contaminants. An increased pressure inside the flotation chamber will counteract this. The pressure in the flotation chamber will adjust itself to the flow conditions set by pump Pl, pump P2, valves E and valve I. If the pump P2 can ⁇ not pump a sufficient amount, more water will be given off to the drain.
  • the addition of air to the lower end of the filters is adjusted by the valve L2.
  • the valve may provide air con ⁇ tinuously or intermittently.
  • a gaseous medium such as air is supplied to the cy ⁇ clone chamber B.
  • oxygen gas may be added or air enriched of oxygen.
  • Carbon dioxide may be added as well.
  • the gaseous medium is supplied by an air compressor or by a narrow injector pipe.
  • the pH may as well be adjusted in the pressure cham ⁇ ber, by the addition of a pH-adjusting agent.
  • Oxidation occurs under pressure in the pressure tank A and filtering occurs through several reflushable filter membranes F, as mentioned above. Because of this, the re ⁇ quired building volume of the equipment may be decreased by up to 70 - 80% compared to prior art equipment. This has been made possible since oxidation as well as flocculation occurs much faster under pressure. In addition, the space required for the filter devices has been decreased since filtration occurs in the flotation chamber C. The equipment is very compact in structure and is also very useable as catastrophic water plants, since it delivers water, which is completely void of bacteria.
  • an apparatus for puri ⁇ fication of water comprising a pressure chamber for oxida- tion under pressure, followed by a flotation chamber com ⁇ prising an integrated filter barrier. Concentration of the contaminations in the flotation chamber is controlled by adjustment of pH and removal of surface and bottom water in the flotation chamber.
  • the apparatus can be used for sur- face water and ground water treatment and different floccu ⁇ lation agents can be added.
  • a water plant built according to the invention reduces different types of contaminations, such as iron, manganese, sulphur hydrogen, carbon acid, hu ⁇ mus, radon, fluorides, arsenic, toxins, heavy metals etc.

Landscapes

  • Physical Water Treatments (AREA)
  • 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)

Abstract

L'invention concerne un procédé et un dispositif de purification de l'eau brute. L'eau brute est pompée dans une cuve sous pression (A). Un supplément d'air, et éventuellement d'agents chimiques, est introduit dans la cuve et mélangé soigneusement avec l'eau brute dans un mélangeur cyclonique (B) de manière à former un grand nombre de microbulles d'air dans le mélange. L'eau brute et laissée s'oxyder dans la cuve sous pression pendant un laps de temps prédéterminé. Le mélange est ensuite conduit à travers des tuyaux et des robinets réducteurs de pression pour arriver jusqu'à des buses qui débouchent dans une cuve de flottaison (C). Lorsque la pression est réduite, les microbulles subissent une expansion et font flotter les floculats et les particules à la surface de la cuve, d'où ils sont retirés, par exemple par passage au-dessus d'un seuil de débordement. Par ailleurs, la cuve de flottaison comprend plusieurs filtres à taille d'exclusion réduite d'environ 0,05 microns. L'eau purifié est aspirée, à travers les filtres, par une pompe (P2) puis expulsée.
PCT/SE2005/001180 2004-07-26 2005-07-26 Procede est dispositif de purification de l'eau brute Ceased WO2006011846A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0401927-9 2004-07-26
SE0401927A SE0401927D0 (sv) 2004-07-26 2004-07-26 Anordning och metod för rening av grundvatten och ytvatten till dricksvattenkvalite

Publications (1)

Publication Number Publication Date
WO2006011846A1 true WO2006011846A1 (fr) 2006-02-02

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PCT/SE2005/001180 Ceased WO2006011846A1 (fr) 2004-07-26 2005-07-26 Procede est dispositif de purification de l'eau brute

Country Status (2)

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SE (1) SE0401927D0 (fr)
WO (1) WO2006011846A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2322016A1 (es) * 2008-09-17 2009-06-15 Universidad De Oviedo Procedimiento de detoxificacion del agua de lixiviacion cianurada de mina.
CN102701475A (zh) * 2012-05-24 2012-10-03 江苏永冠给排水设备有限公司 一种组合式除氟水处理设备
CN111233248A (zh) * 2018-11-29 2020-06-05 浙江问源环保科技股份有限公司 一种尾水深度处理方法及装置
CN111410356A (zh) * 2020-03-28 2020-07-14 施莉莉 一种全自动多功能多用途节能环保水净化设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784468A (en) * 1971-09-20 1974-01-08 Exxon Production Research Co System and method for separating heavier and lighter components of liquid mixtures
US4193869A (en) * 1974-11-21 1980-03-18 Milton Brucker Wastewater and wastewater solid processing system
SU994014A1 (ru) * 1980-02-26 1983-02-07 Азербайджанский Инженерно-Строительный Институт Установка дл флотационной очистки сточных вод
US5069783A (en) * 1990-05-16 1991-12-03 Int'l Environmental Systems, Inc. Liquid treatment apparatus
WO1998031634A1 (fr) * 1997-01-15 1998-07-23 Hans Eriksson Procede et dispositif de purification d'un liquide par flottation
US6106711A (en) * 1997-07-15 2000-08-22 Morse; Dwain E. Fluid conditioning system and method
US6146525A (en) * 1998-02-09 2000-11-14 Cycteck Environmental, Inc. Apparatus and methods for separating particulates from a particulate suspension in wastewater processing and cleaning

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784468A (en) * 1971-09-20 1974-01-08 Exxon Production Research Co System and method for separating heavier and lighter components of liquid mixtures
US4193869A (en) * 1974-11-21 1980-03-18 Milton Brucker Wastewater and wastewater solid processing system
SU994014A1 (ru) * 1980-02-26 1983-02-07 Азербайджанский Инженерно-Строительный Институт Установка дл флотационной очистки сточных вод
US5069783A (en) * 1990-05-16 1991-12-03 Int'l Environmental Systems, Inc. Liquid treatment apparatus
WO1998031634A1 (fr) * 1997-01-15 1998-07-23 Hans Eriksson Procede et dispositif de purification d'un liquide par flottation
US6106711A (en) * 1997-07-15 2000-08-22 Morse; Dwain E. Fluid conditioning system and method
US6146525A (en) * 1998-02-09 2000-11-14 Cycteck Environmental, Inc. Apparatus and methods for separating particulates from a particulate suspension in wastewater processing and cleaning

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 198444, Derwent World Patents Index; Class D15, AN 1984-274236 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2322016A1 (es) * 2008-09-17 2009-06-15 Universidad De Oviedo Procedimiento de detoxificacion del agua de lixiviacion cianurada de mina.
ES2322016B2 (es) * 2008-09-17 2010-02-08 Universidad De Oviedo Procedimiento de detoxificacion del agua de lixiviacion cianurada de mina.
CN102701475A (zh) * 2012-05-24 2012-10-03 江苏永冠给排水设备有限公司 一种组合式除氟水处理设备
CN111233248A (zh) * 2018-11-29 2020-06-05 浙江问源环保科技股份有限公司 一种尾水深度处理方法及装置
CN111410356A (zh) * 2020-03-28 2020-07-14 施莉莉 一种全自动多功能多用途节能环保水净化设备
CN111410356B (zh) * 2020-03-28 2021-04-23 苏州尚源智能科技有限公司 一种全自动多功能多用途节能环保水净化设备

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