Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B11/00—Oxides or oxyacids of halogens; Salts thereof
  • C01B11/02—Oxides of chlorine
  • C01B11/022—Chlorine dioxide (ClO2)
  • C01B11/023—Preparation from chlorites or chlorates
  • C01B11/026—Preparation from chlorites or chlorates from chlorate ions in the presence of a peroxidic compound, e.g. hydrogen peroxide, ozone, peroxysulfates
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
  • A01K7/00—Watering equipment for stock or game
  • A01K7/02—Automatic devices ; Medication dispensers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
  • B01F35/80—Forming a predetermined ratio of the substances to be mixed
  • B01F35/83—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
  • B01F35/831—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices using one or more pump or other dispensing mechanisms for feeding the flows in predetermined proportion, e.g. one of the pumps being driven by one of the flows
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B11/00—Oxides or oxyacids of halogens; Salts thereof
  • C01B11/02—Oxides of chlorine
  • C01B11/022—Chlorine dioxide (ClO2)
  • C01B11/023—Preparation from chlorites or chlorates
  • C01B11/024—Preparation from chlorites or chlorates from chlorites
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B11/00—Oxides or oxyacids of halogens; Salts thereof
  • C01B11/08—Chlorous acid
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B11/00—Oxides or oxyacids of halogens; Salts thereof
  • C01B11/08—Chlorous acid
  • C01B11/10—Chlorites
• • 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
  • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
  • C02F1/685—Devices for dosing the additives
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
  • B01F23/40—Mixing liquids with liquids; Emulsifying
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
  • B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
  • B01F35/32—Driving arrangements
  • B01F35/32005—Type of drive
  • B01F35/32015—Flow driven
• • 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
  • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
  • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
  • C02F2103/026—Treating water for medical or cosmetic purposes
• • 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
  • C02F2209/40—Liquid flow rate

Definitions

• This invention relates to an apparatus, a process that can be used for producing an oxyhalo compound such as, for example, chlorine dioxide, and a process for producing animal drinking water.
• an oxyhalo compound is an important industrial chemical.
• chlorine dioxide is a commercially important chemical for use as a bleaching, disinfection, oxidizing, fumigating, sanitizing or sterilizing agent and can replace chlorine and hypochlorite products traditionally used in such applications because it produces lower levels of chlorinated organic compounds than chlorine when it is used to treat raw water containing organic compounds.
• Chlorine dioxide is less corrosive than chlorine to metals.
• An apparatus that can be used to produce an oxyhalo compound is provided which comprises a fluid proportioning device comprising three or more fluid transferring devices, a conduit to the inlet of each fluid transferring device, a conduit to the outlet of each cylinder, a water inlet to the device, and a water outlet from the device.
• a process that can be used for producing a chemical comprises introducing a water flow to and through an apparatus to produce a downstream water; feeding three or more precursor chemicals at a proportional rate to each other to and through the apparatus by using the water flow as a motive force for proportionally feeding the precursor chemicals at a rate relative to the water flow; and combining the precursor chemicals with the downstream water whereby a chemical reaction occurs between two or more of the precursor chemicals.
• the apparatus can be the same as that disclosed above.
• a process that can be used for producing animal drinking water is provided.
• the process comprises (a) flowing water through a fluid proportioning device, which comprises three or more fluid transferring devices, to create a downstream water and to actuate said fluid transferring devices; (b) drawing a metal chlorite, a metal hypochlorite, and an acid each from a separate source and flowing each separately through one of the fluid transferring devices; and (c) combining the metal chlorite, metal hypochlorite, and acid with the downstream water to produce water suitable for animal drinking.
• a fluid proportioning device which comprises three or more fluid transferring devices, to create a downstream water and to actuate said fluid transferring devices
• drawing a metal chlorite, a metal hypochlorite, and an acid each from a separate source and flowing each separately through one of the fluid transferring devices and (c) combining the metal chlorite, metal hypochlorite, and acid with the downstream water to produce water suitable for animal drinking.
• the apparatus can comprise a fluid proportioning device, which comprises a water inlet; a water outlet; a main water-driven drive assembly; and a first, a second, a third, and optionally additionally fluid transferring devices.
• the water inlet is connectable to a water source and the fluid transferring device can comprise a transferring device inlet and a transferring device outlet, each being connectable to a conduit.
• the water source is capable of producing a water flow into and through the main water-driven drive assembly thereby producing a downstream water through said water outlet.
• Each of the fluid transferring devices is proportionally actuated by the water flow thereby withdrawing through the first, second, third, and optionally additional fluid transferring devices through which precursor chemicals are respectively drawn in a proportional amount independent of the flow rate of the water flow and discharging, for example, the precursor chemicals to said downstream water.
• the fluid proportioning device can comprise an inlet end connectable to a water source with an inlet conduit.
• the proportioning device also comprises an outlet end connectable to an outlet conduit. Water can flow to the inlet and through the proportioning device exiting the outlet thereby creating a downstream water.
• the outlet end is connectable to the downstream water with the outlet conduit.
• the main water-driven drive assembly is directly coupled to each of the respective fluid-fluid transferring devices, thus providing proportioned chemical feeds relative to the drive water flow.
• the first, second, third, and optional additional chemical inlet ports through which precursor chemicals can be respectively drawn into and through the fluid transferring devices by individual conduits.
• the proportioning device comprises a first, a second, a third, and optionally additional chemical outlet ports through which the precursor chemicals are respectively drawn to the downstream water by and tlirough these individual conduits.
• the individual conduits can enter the downstream water at one or more locations, preferably at two or more locations or points.
• Each fluid transferring device also comprises a metering piston.
• the proportioning device can also comprise a piston actuator for reciprocally moving each metering piston within its respective fluid transferring device.
• the actuator can have an actuating fluid inlet and an actuating fluid outlet.
• the actuating fluid inlet can be connected to the conduit downstream of the inlet end.
• the actuating fluid outlet can be connected to the conduit upstream of the precursor chemical inlet ports therein.
• the actuator is generally responsive to a flow of water through the conduit to reciprocate each metering piston within its associated fluid transferring device thereby drawing a respective metered amount of precursor chemical from its source and to inject or introduce that metered amount of precursor chemical, which can be fixed or adjusted at the actuator, into the conduit tlirough a chemical inlet port therein. Referring to FIG. 1, a flow diagram of the apparatus is shown.
• the apparatus is illustrated herein with three fluid transferring devices, though more than three can be used for a variety of applications.
• Water flows through inlet 11 , though valve 13 which controls the amount of water flow, preferred valve is a pressure regulating valve, pressure gauge 14, a flowmeter 15 measuring the quantity of water flow therethrough, and through a proportioning device 20, through which the water stream flows to outlet 12.
• Precursor chemicals such as, for example, a metal hypochlorite, a metal chlorite, and a mineral acid, as disclosed below, can be independently fed to and through lines or conduits 21, 22, and 23 to the fluid transferring devices of the proportioning device 20.
• the chemicals carried by conduits 21, 22, and 23 independently exit the fluid transferring devices of device 20 through conduits or conduits 31, 32, and 33.
• Conduits 31, 32, and 33 independently enter conduit 36. These conduits can be made from any suitable materials such as, for example, plastics and corrosion- resistant metals.
• control valves such as, for example, check valves, 41, 42, and 43
• the precursor chemicals that are useful for producing another chemical such as, for example, an oxyhalo compound that is more fully disclosed below, carried by conduits 21, 22, and 23 reenter conduit 36 and can be diluted by the downstream water in conduit 36. Reaction takes place at where two or more precursor chemicals meet and an oxyhalo compound can be produced forming an aqueous solution.
• the three or more precursor chemicals can be pre-reacted in a chamber or a conduit prior to injection or introduction into the downstream water conduit 36.
• Proportioning device 20 can be any suitable device disclosed above and can be a pump.
• a preferred pump is a proportioning pump such as that disclosed in US patent 4,572,229 or 5,433,240 with the exception that tliree or more slave cylinders disclosed in the patents are used herein as fluid transferring devices.
• Each fluid transferring device can be the same as that disclosed in US Patent 4,572,229 or 5,433,240 with the exception that additional cylinders having connecting rods are included in the proportioning device used herein. The entire disclosures of these patents are incorporated herein by reference.
• FIG. 2 illustrates an embodiment of the apparatus where inlet water (drive water) flows passing a local pressure gauge 54 and flow indicator 55. The water, under pressure, enters the proportioning pump 60.
• a proportioning device illustrated herein is a proportioning pump such as shown in reference numeral 60, which is commercially available from Crown Technology Corporation, Boise, Idaho.
• the term "proportioning” pump refers to a pump that proportionally mixes fluids by automatic, self-powered devices.
• the water can be considered “drive” water as it is used to drive the main internal piston assembly, as disclosed in US 4,572,229 and US 5,433,240, which is used to actuate the three individual pistons within the pump (fluid transferring devices or pump cylinders).
• the fluid transferring device or cylinder pistons As the fluid transferring device or cylinder pistons actuate back and forth, the individual precursor compounds are drawn in from conduits 61, 62, and 63 and then displaced out of the pump cylinder chambers each complete piston cycle.
• each pump cylinder chamber can be fixed but is adjustable using an external chemical feed adjustment dial (reference numerals 64, 65, and 66).
• an external chemical feed adjustment dial reference numerals 64, 65, and 66.
• the frequency of piston actuation remains proportional to the water flow.
• each of the precursor chemicals feeds proportionally to the varying flow thus providing constant chemical concentration in the water outlet.
• the safety benefit in the mode of operation is that if water flow to the pump stops, so does the injection or introduction of precursor chemicals.
• the drive water exits the pump it passes an in-line check valve (reference numerals 81, 82, and 83). Following this check valve are three individual chemical injection points. Optionally these three precursor chemicals can be injected or introduced simultaneously at one injection point.
• the proportioned chemicals leaving the fluid transferring devices can be injected or introduced into each of these points (under pressure provided by the displacement portion of the piston cycle) or at the same point.
• these precursor chemicals can be immediately diluted by the drive water that has passed through the proportioning device or pump.
• they combine in-stream and react to form the desire product such as, for example, dilute solution of chlorine dioxide (ClO 2 ) as disclosed below.
• a portion of water can be diverted to by-pass conduit 35 or 75.
• Valve 34 or 74 can be used to control the amount water going through conduit 36 or 76 that is used to dilute precursor compounds exiting from proportioning device 20 or 60 via conduits 31, 32, and 33 (71, 72, and 73 in FIG. 2) entering the water stream at 41, 42, and 43 (81, 82, and 83 in FIG. 2). Water diverted through conduit 35 or 75 reenters conduit 36 or 76 downstream.
• the precursor chemicals can be pre-reacted in a small chamber just prior to further dilution in the drive water.
• Also disclosed in the invention is a process that can be used for producing an oxyhalo compound.
• An oxyhalo compound refers to a chemical compound containing at least one halogen and one oxygen in the molecule.
• suitable oxyhalo compounds include, but are not limited to, chlorine dioxide, bromine dioxide, hypochlorous acid, hypobromous acid, hypochlorites, hypobromites, ' chlorous acid, acidified sodium chlorite, and combinations of two or more thereof.
• the process can comprise introducing a water flow to and through an apparatus disclosed above to produce a downstream water; feeding three or more precursor chemicals at a proportional rate to each other to and tlirough the apparatus; and combining the precursor chemicals with the downstream water wherein the water flow is used as a motive force for proportionally feeding the precursor chemicals to and tlirough the apparatus at a rate relative to the water flow whereby a chemical reaction occurs between two or more of the precursor chemicals.
• the process can also comprise (a) flowing water through a fluid proportioning device, which can be as the one disclosed above to create a downstream water and to actuate the fluid transferring devices; (b) drawing three or more precursor compounds each from a separate source and flowing each of the precursor compounds separately through one of the fluid transferring devices; and (c) injecting or introducing the precursor compounds into the downstream water whereby a chemical reaction occurs between two or more of the precursor chemicals.
• a fluid proportioning device can be as the one disclosed above to create a downstream water and to actuate the fluid transferring devices
• drawing three or more precursor compounds each from a separate source and flowing each of the precursor compounds separately through one of the fluid transferring devices and (c) injecting or introducing the precursor compounds into the downstream water whereby a chemical reaction occurs between two or more of the precursor chemicals.
• Any precursor chemicals known to one skilled in the art can be used.
• suitable precursor compounds for producing chlorine dioxide are well known in the art. Illustrated examples include a metal chlorite that can be contacted with an acid to produce chlorine
• chlorine dioxide can be produced by contacting (1) a metal chlorite and (2) a metal hypochlorite with (3) an acid.
• a metal chlorite can be an alkali metal chlorite, alkaline metal chlorite, or combinations thereof.
• Example of metal chlorite includes sodium chlorite, potassium chlorite, or combinations thereof.
• a metal hypochlorite can be an alkali metal hypochlorite, alkaline metal hypochlorite, or combinations thereof.
• Example of metal hypochlorite includes sodium hypochlorite, potassium hypochlorite, or combinations thereof.
• Any acid can be used.
• Example of such acid includes sulfuric acid, phosphoric acid, nitric acid, hydrochloric acid, or combinations thereof.
• the molar ratio of metal chlorite to acid can be in the range of from about O.OOlJ to about 100:1 or about 0.001:1 to about 10:1 and that of metal hypochlorite to acid can also be in the range of from about 0.001:1 to about 100:1 or about 0.001:1 to about 10:1.
• Suitable precursor compounds can also include a metal chlorate, an oxidizing agent, and an acid.
• chlorine dioxide can be produced by contacting (1) a metal chlorate and (2) an oxidizing agent with (3) an acid.
• a metal chlorate can be an alkali metal chlorate, alkaline metal chlorate, or combinations thereof.
• Example of metal chlorate includes sodium chlorate, potassium chlorate, or combinations thereof.
• oxidizing agent such as inorganic oxidizing agent, organic oxidizing agent, or combinations thereof can be used.
• Example of oxidizing agent includes hydrogen peroxide, peracetic acid, oxides of nitrogen, sodium peroxide, benzoyl peroxide, r ⁇ -chlorobenzoic acid, m- bromobenzoic acid, /?-chlorobehzoic acid, or combinations thereof. Any acid disclosed above can be used.
• the molar ratio of metal chlorate to acid can be in the range of from about 0.001:1 to about 10:1 and that of oxidizing agent to acid can also be in the range of from about 0.001:1 to about 10:1.
• precursor compounds for producing oxyhalo compounds include, but are not limited to; Sodium bromide and sodium hypochlorite, chlorine, organic acids and mineral acids.
• the precursor compounds can be combined, for example, by mixing with a mechanical mixer or static mixer.
• the production can be carried out under any suitable conditions. It is preferred that an apparatus disclosed above be used for.
• a chemical product such as chlorine dioxide in water can be transferred to a holding tank or to its ultimate end use, for example, a municipal water treatment plant or the treatment of waste in a sewage plant.
• a colorimeter can be used to monitor the chlorine dioxide concentration, if desired.
• the solution can also be monitored by pH meter and the pH can be accordingly adjusted to about 2.0 - 10 by any means known to one skilled in the art.
• Alternative means of monitoring include ORP (oxidation reduction potential), residual monitors, and spectrophotometric analyzers.
• the process is preferably carried out at a turndown rate of at least about 40: 1 , preferably at least about 20: 1 , and more preferably at least 10:1.
• the term "turndown" is defined as the ratio of the maximum to the minimum oxyhalo compound, such as chlorine dioxide, production rate achievable by the equipment. Also disclosed is a process for producing a ClO 2 -containing water.
• the process comprises flowing water to produce a downstream water; and feeding into the downstream water three or more precursor chemicals at a rate relative to the flow of the water and at proportional rates to each other thereby producing the ClO -containing water in which the flowing water provides a motive force for proportionally feeding the precursor chemicals to the downstream water.
• the dilute solution of ClO 2 can be then directed to a point of application.
• Illustrative applications can include, but are not limited to, food contact sanitation, dairy sweet water systems, dairy process water disinfection (cooling water, heating water, potable), dairy pasteurizers, dairy CIP (cleaning-in-place) systems, dairy hard surface, sanitation/disinfection, dairy fermentor process aid, poultry plant process water disinfection (dip chillers and flash cool air chillers, scalders), poultry plant CIP sanitation/disinfection, poultry plant hard surface sanitation/disinfection, meat plant process water disinfection (cooling water, heating water, dip chillers, flash cool air chillers, brine shower chillers), meat processing carcass rinse, meat plant CIP sanitation/disinfection, meat plant hard surface sanitation/disinfection, fruit and vegetable processing plant process water disinfection (cooling water, heating water, hydro-cooler treatment, vegetable rinses, flume water), fruit and vegetable processor CIP systems, fruit and vegetable processing plant hard surface sanitation/disinfection, fruit and vegetable storage treatment (pre-storage treatment, humidification systems treatment), mushroom processing
• Also provided is a process for producing animal drinking water which comprises (a) flowing water through a fluid proportioning device, which comprises three or more fluid transferring devices, to create a downstream water and to actuate said fluid transferring devices; (b) drawing a metal chlorite, a metal hypochlorite, and an acid each from a separate source and flowing each separately tlirough one of the fluid transferring devices; and (c) combining the metal chlorite, metal hypochlorite, and acid with the downstream water to produce water suitable for animal drinking.
• the fluid proportioning device, metal chlorite, metal hypochlorite, acid, and process for using the device can be the same as those disclosed above.
• Precursor Chemicals Chlorine Dioxide was generated from the following precursor chemicals: (1) sodium chlorite solution (25% (w/w); obtained from IDI, North Kingstown, RI, USA); (2) sodium hypochlorite solution (10.5% (w/w); purchased from RJ Pool, Cranston, RI; USA; assayed by iodometric titration at 12.4% (w/w) sodium hypochlorite); and (3) hydrochloric acid solution (31.45% (w/w); purchased from Mancini Hardware, North Kingstown, RI: USA).
• De-gassed sample chlorite ion and chlorate ion was determined by use of a Dionex ® (Sunnyvale, CA) DX-120 Ion Chromatograph.
• a Dionex ® AS40 Automated Sampler was used. All samples were analyzed in duplicate.
• a Dionex ® AS9SC Column and ASRS suppressor was utilized with a 7 to 8 mM bicarbonate eluent with a 2 ml/minute flow. This method was consistent with EPA Method 300.
• [ClO 2 ] and [ClO " J were determined by method AM- 100-07 revA or [ClO 2 ] was determined by the DR/2000 spectrophotometer method 75 and [ClO 2 " J was determined by ion chromatography. Yield, as defined in EPA Guidance Manual: Alternative Disinfectants and Oxidants, EPA, April 1999, page 4-3, yield was calculated as:
• Example 1 This example illustrates that the invention provides high efficiency, yield and purity with low excess chlorine. Eight samples were obtained with the sodium chlorite being fed at 85% of the maximum rate, sodium hypochlorite being fed at 100% of the maximum rate and hydrochloric acid being fed at 40% of the maximum rate. The motive water inlet pressure was adjusted to vary the chlorine dioxide solution flow. Two samples were taken at 1.5 US gallons per minute (GPM), four at 3.0 GPM and two at 6.0 GPM. This represented a chlorine dioxide production rate of 35 to 142 PPD (pounds per day) Cl ⁇ . Excess chlorine as defined in EPA Guidance Manual: Alternative Disinfectants and Oxidants, EPA, April 1999, pp. 4-3, was measured at less than 0.1%).
• Chlorine dioxide concentration was measured from 1940 to 2010 mg/1 with a mean of 1974 mg/1.
• Chlorite ion concentration was measured from 1.0 mg/1 to 6J mg/1, with a mean of 3.3 mg/1.
• Chlorate ion concentration was measured from 118 mg/1 to 145 mg/1, with a mean of 132 mg/1.
• the efficiency as measured by spectrophotometry and ion chromatography varied from 99.7% to 99.9% with a mean of 99.8%.
• the yield as measured by spectrophotometry and ion chiOmatography varied from 94.2% to 95.3% with a mean of 94.7%.
• Example 2 This example shows the effect of reduced chlorine dioxide solution flow rate.
• the apparatus was run as in Example 1, but with reduced chlorine dioxide solution flow rates of 0.75 GPM and 0.30 GPM to demonstrate further turndown.
• 0.75 GPM yield's of 93.9% and 93.8% was obtained.
• For 0.3 GPM 89.4% and 87.8% was obtained.
• Example 3 This example demonstrates that chlorate ion in the chlorine dioxide solution is present partially due to its presence as an impurity in the precursor sodium hypochlorite solution.
• the apparatus was run as Example 1, but potable water was used in place of the sodium chlorite and hydrochloric acid feeds. A mean of 76 mg/1 of chlorate ion was measured in the samples. This indicated that some of the chlorate measured in Example 1 formed as a byproduct of the chlorine dioxide generation, but is an impurity in the sodium hypochlorite feed. Recalculating the yield by compensating for this background chlorate resulted in yields from 97.1% to 98.3% with a mean of 98.7% for Example 1.
• Example 4 This example demonstrates the effect of changing hydrochloric acid feed rate.
• the apparatus was run with the sodium chlorite being fed at 88% of the maximum rate, Sodium hypochlorite being fed at 100%) of the maximum rate and hydrochloric acid being fed at between 30% and 50% of the maximum rate.
• the chlorine dioxide solution flow was kept at 3.0 GPM.
• Example 5 This example demonstrates that separating hypochlorite/acid and chlorite injection points improves yield
• the apparatus was as shown in FIG. 2 with the exception that the injections points 81, 82 and 83 were relatively close than FIG. 2 shows and there was a static mixers downstream of 83; the chlorite was injected immediately down stream of the hypochlorite and acid injection point.
• the yields obtained was 91.2% and 91.3%, about 3.5% lower than the mean yield for Example 1, where there was residence time between the hypochlorite/acid and chlorite injection points.
• Example 6 This example shows that using a static mixer improve yield.
• the apparatus was the same as that disclosed for Examples 1-4 except that the static mixers were replaced with a schedule 80 pipe, which is well known to one skilled in the art.
• the yields obtained were from 93.7% about 94.0%, with a mean of 93.8%. This mean was 0.9% lower than the mean yield for Example 1, demonstrating that the static mixers improve yield.
• Example 7 This example illustrates using a static mixer between hypochlorite/acid and chlorite injection points.
• the apparatus was the same as that used Example 6.
• the yields obtained were from 93.0%> to 95.9%, with a mean of 94.1%. This mean is 0.6%) lower than the mean yield for Example 1, demonstrating that the static mixers between the injection points improved the yield.
• the yields were also higher than for Example 6, demonstrating that the static mixer after the chlorite injection point improved yield.
• Example 8 This example shows the effect of ClO 2 concentration turndown.
• the apparatus was the same as that used in Example 6.
• the ratio of the precursors to each other was kept constant, but the ratio to the motive water flow was reduced.
• Example 9 This example illustrates using a solution produced by the invention for chicken drinking water.
• Broiler chickens raised on a northeast Texas, US commercial chicken farm were used for the study.
• a typical chicken farm comprised about 10 to 12 chicken houses each had about 15,000 chickens.
• All broilers for the runs came from the same genetic stock.
• Water was fed to the chickens at a rate of about 2 gallons (7.57 liters) per minute.
• All water lines, about 1/8 inch (0.32 cm) diameter, for feeding the chickens were first cleaned with adequate Biosentry Aqua Max ® cleaning solution, according to the manufacturer's instruction.
• regular tap water was used to feed the chickens.
• Sodium chlorite, sodium hypochlorite, and phosphoric acid were each withdrawn from the inlets of the apparatus. Sodium chlorite and sodium hypochlorite were used to disinfect the water lines and phosphoric acid was used to adjust pH to the range of about 4 to about 6.
• the quantity of each chemical required was the quantity that maintained the pH of the water at the above-disclosed pH, or about 3-10 parts per million (by weight; ppm) of free chlorine in the water, or about 0.5 to about 0.8 ppm of In-situ produced chlorine dioxide in the water, or the quantity that controlled the formation of biofilm in the water pipes or conduits. All chickens were fed with the same commercially available feed typically for 50 days.
• the fatality of chickens fed with water generated by the invention and tap water was then determined. It was found that the test flock had 96.69% livability at the end of the growing cycle compared to 94.58% for the control flock. Additionally, the test flock had a 1.89 feed conversion compared to 1.93 for the control flock. The lower feed conversion means less feed was required to achieve the same chicken weight. The results demonstrate that the drinking water produced by the invention not only increased the survival rate of chickens but also improved the feed conversion.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• Inorganic Chemistry (AREA)
• Water Supply & Treatment (AREA)
• Hydrology & Water Resources (AREA)
• Environmental & Geological Engineering (AREA)
• Environmental Sciences (AREA)
• Engineering & Computer Science (AREA)
• Health & Medical Sciences (AREA)
• Medicinal Chemistry (AREA)
• Animal Husbandry (AREA)
• Biodiversity & Conservation Biology (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Treatment Of Water By Oxidation Or Reduction (AREA)
• Apparatus For Disinfection Or Sterilisation (AREA)
• Accessories For Mixers (AREA)
• Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Applications Claiming Priority (4)

Publications (1)

Family

ID=34084520

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (3)

Family Cites Families (8)

• 2004
  • 2004-06-29 TW TW093119130A patent/TW200510245A/zh unknown
  • 2004-07-09 CA CA002527306A patent/CA2527306A1/en not_active Abandoned
  • 2004-07-09 JP JP2006520298A patent/JP2007534455A/ja not_active Withdrawn
  • 2004-07-09 EP EP04778197A patent/EP1648600A1/de not_active Withdrawn
  • 2004-07-09 WO PCT/US2004/022560 patent/WO2005007281A1/en active Application Filing

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events