WO1996041245A1 - Systeme continu de surveillance en ligne pour optimiser l'adjonction de coagulant et de floculant dans des eaux residuelles et dans les systemes de cabines de peinture par pulverisation - Google Patents

Systeme continu de surveillance en ligne pour optimiser l'adjonction de coagulant et de floculant dans des eaux residuelles et dans les systemes de cabines de peinture par pulverisation Download PDF

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Publication number
WO1996041245A1
WO1996041245A1 PCT/US1996/006862 US9606862W WO9641245A1 WO 1996041245 A1 WO1996041245 A1 WO 1996041245A1 US 9606862 W US9606862 W US 9606862W WO 9641245 A1 WO9641245 A1 WO 9641245A1
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WO
WIPO (PCT)
Prior art keywords
treatment
additive
fluid
wastefluid
property
Prior art date
Application number
PCT/US1996/006862
Other languages
English (en)
Inventor
David Brian Mitchell
Thomas P. Curran
Steven M. Deboo
Gary G. Engstrom
Larry M. Kye
John Richardson
Original Assignee
Betzdearborn Inc.
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 Betzdearborn Inc. filed Critical Betzdearborn Inc.
Priority to AU57470/96A priority Critical patent/AU5747096A/en
Publication of WO1996041245A1 publication Critical patent/WO1996041245A1/fr

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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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5209—Regulation methods for flocculation or precipitation
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
    • G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means

Definitions

  • This invention relates generally to the treat ⁇ ment of fluid flowing through a wastefluid treatment system. More specifically, the invention relates to an automatic device and method for optimizing the amount of treatment-additive released into a wastefluid treatment system for contaminant removal.
  • contaminated fluids are generated every day. Such contaminated fluids are a result of manufacturing processes, the propensity of certain fluids to absorb other materials, and the practical necessity of expeditiously moving waste products from one location to another. Examples of contaminated fluids include municipal sewage, water scrub from paint booths, food industry waste water, textile waste fluid, electroplating waste from plating baths and street wash-off.
  • Treatment additives are substances which interact with contaminants in the contaminated fluid and by means of such interaction cause the contaminant to precipitate, coagulate, flocculate, agglomerate, settle or otherwise to become more amenable to removal from the fluid by solids separators such as filters, clarifiers, hydrocyclones, or dissolved air floatation unit (“DAF”) .
  • solids separators such as filters, clarifiers, hydrocyclones, or dissolved air floatation unit (“DAF”) .
  • Treatment additives include coagulating agents (such as aluminum sulfate, polyaluminum hydroxide, dimethylamine epichlorohydrin, dimethyldiallyl ammonium chloride, cat- ionic starches and cationic tannins) , flocculants (such as anionic polyacrylamides, acrylic acid-acrylamide, and cationic polyacrylamides, such as dimethylaminoethy1- acrylate) , as well as numerous other materials, such as demulsifiers.
  • the optimal concentration of treatment-addi ⁇ tive in a wastefluid treatment system is dependent on a number of factors, but in particular upon the concentra ⁇ tion of contaminant(s) in the fluid which is to be clarified. Too little treatment-additive will inade- quately remove contaminant from the fluid. Too much treatment-additive will in itself contaminate the fluid.
  • One particularly useful method employs addition of a coagulant and/or flocculating agent prior to movement of the liquid into a solid-separator known as a clarifier (a lamella design being very common in industrial waste water treatment) .
  • Clarifiers may be substituted with a DAF or other solid-separator such as a hydrocyclone or filter. It should be understood, however, that there a numerous other methods known in the art and this general descrip ⁇ tion is not intended to be limiting in any way.
  • the concentration of con- taminant in any particular aliquot of contaminated fluid may significantly differ from the concentration of con ⁇ taminant in a previous or subsequent aliquot.
  • concentration of contaminant must be monitored over time and the concentration of treatment- additive varied with the concentration of contaminant.
  • the optimum concentration of treatment-additive has been determined by removing an aliquot of the contaminated fluid prior to, and after, the addition of the treatment-additive and analyzing "off-line" a parameter related to the contaminant concentration of each aliquot.
  • United States Patent No. 3,693,791 ('791 patent) to Topol describes two turbidity meters (turbidity being related to fine particulate concentration) connected in the main flow of the treat ⁇ ment system. Such meters are positioned to measure the turbidity of a liquid before and after the addition of a treatment-additive prior to the passage of the liquid through a filter structure. The relative signal strengths produced by each meter are used to determine the amount of treatment-additive which should be added to the system.
  • United States Patent No. 3,605,775 United States Patent No. 3,605,775
  • turbidity meters are placed at the influent and effluent ends of a liquid treatment system.
  • the turbidity measurements from each monitor are mathematically contrasted with a pre-determined desired turbidity measurement.
  • the mathematical result is used to determine the amount of a treatment-additive which should be added to the system.
  • United States Patent No. 4,277,343 to Paz ('343 patent) describes an in-line monitoring system for continuously monitoring and controlling alka ⁇ linity in an aqueous solution.
  • '343 patent a system is shown wherein signals from three pC0 2 probes are used to adjust the amount of an alkalinity-control ⁇ ling chemical added to the aqueous solution. The three probes are described as being all located prior to the filter.
  • Prior art pilot line systems also suffer from a number of drawbacks.
  • prior art systems such as those described in the '149 patent, call for the system operator to set a range for the parameter measured in which the system will operate without change in the amount of the treatment-additive released into the system. That is, such systems adjust the dose of treatment-additive only if the parametric measurement is outside of a pre-determined range. Since such systems employ only a monitor located at the effluent end of the pilot line, these systems further fail to correlate the quality of the treated, filtered fluid with that of the treated, unfiltered fluid.
  • the present invention overcomes many of the disadvantages of prior art wastefluid treatment systems. These disadvantages are overcome by employment of two or more contaminant-concentration dependent detectors positioned in the flow of one or more pilot line(s) emanating at select point(s) along the main fluid conduit. Such detectors include those measuring streaming current, ultraviolet absorption, infrared absorption and specific ions. The select point(s) (is)are chosen such that the detectors are positioned to measure contamination-concentration dependent parameters with respect to treatment-additive treated fluid, and solids-separated (e.g. , filtered) , treatment-additive treated fluid.
  • the signal from the treatment-additive, solids-separated fluid detector is correlated with the signal from the treatment-additive, non-solids-separated fluid detector and the correlative function is used to calculate the optimal concentration of treatment- additive which should be released into the system.
  • the parameter which is measured is turbidity. It has been discovered that the turbidity of an non-solids-separated, treatment- additive treated sample and that of a solids-separated, treatment-additive treated sample are reduced to a minimum at approximately the same concentration of treatment-additive. Addition of more treatment-additive to the non-solids-separated, treatment-additive treated sample causes an increase in turbidity, whereas with the solids-separated, treatment-additive treated sample a further increase in the amount of treatment-additive causes no further change in turbidity.
  • the concentration of treatment-additive at which turbidity of both samples is reduced to a minimum has been determined to approximate the optimal concentration of treatment-additive in the system. Since the accuracy of optically-based turbidi ⁇ ty detectors is diminished by widely differing flow rates to the detectors, the flow to the turbidity detectors is preferably maintained approximately con ⁇ stant. In the case of the Surface Scatter 6® manufac- tured by HACH Company, optimum flow is approximately between 0.1-1.5 gallons per minute (GPM) . Constant flow rate to the turbidity meter further aids in maintaining a constant shear rate in the treatment system. Variations in shear rate may impact upon the clarifica- tion performance of the treatment-additive.
  • Constant flow rate through the detectors can be accomplished by the conventional means well known to one skilled in the art.
  • a flow monitoring means can be coupled to a pump which can add volume from the main conduit into the pilot line leading to the monitor if a deficit in fluid flow past the detector is detected (or subtract volume from the pilot line if too much fluid flows past the detector) .
  • the solids- separator is a filter device.
  • the filter device should withstand considerable solids loading for the waste stream being clarified (e.g. withstanding solids loading of from 100-10,000 ppm total suspended solids in a typical industrial wastewater stream) .
  • the later may be accomplished by means of a bag and/or a continuously unwinding filter, such as an EMCO filter manufactured by EMCO Filtration Company.
  • Fig. 1 is a side view, with a cutaway portion, showing fluid flow direction and pilot line diversion in an embodiment of the present invention.
  • Fig. 2 is a side view, with a cutaway portion, of an alternative embodiment of the present invention.
  • Fig. 3 is a graph of turbidity measurements as a function of detackifier concentration, made on filtered and unfiltered detackified paint sump waste.
  • Fig. 4 is a graph of turbidity measurements as a function of polymeric coagulant concentration, made on filtered and unfiltered wastewater from a manufacturer of marine motors.
  • contaminated fluid is passed into the monitoring system pilot line from a process pipe 10.
  • Flow from process pipe 10 into the system is controlled by a flow gauge 11, flow being kept as constant as possible.
  • Flow through the monitoring system is aided by a plurality of pumps 12 and 16, such as peristaltic pumps.
  • the contaminated fluid enters by means of an inlet pipe 13, into a first addition pot 14 wherein a first treatment additive 32 (e.g. coagulant) is added to the fluid by means of a feed pump 35.
  • the fluid is detained for approximately 1 minute in the first addition pot 14 while it is mixed with the first treatment additive from source 32.
  • a first treatment additive 32 e.g. coagulant
  • the flow of the additive-treated fluid is subsequently directed through a first static mixer 15 where it is mixed.
  • the fluid is then either led by a by-pass conduit 38 (by manipulation of by-pass conduit valves 20) to the treatment-additive treated, unfiltered fluid turbidity sensor 27 and the treatment-additive treated, filtered fluid turbidity sensor 24, or directed to a pH adjustment detention pot 14 (in which pH adjusting material is added to, and mixed with, the fluid) by means of the by-pass conduit 38 (by manipulation of by ⁇ pass conduit valves 20) if the pH of the fluid needs to be adjusted for maximum particulate settlement, or directed through a plurality of other second addition pots 17 interconnected to other static mixers 18 disposed in the main conduit wherein further treatment- additive may be added to the fluid (which can be of another type than that added to the fluid entering the first addition pot, e.g.
  • the fluid is ultimately directed to the treatment-additive treated, filtered fluid turbidity sensor 24 after passage through filter 21, or to the treatment-additive treated, unfiltered fluid turbidity sensor 27.
  • the flow rate to each sensor is monitored by flow meters 23 and 26, the readings of the flow meters being used to correct sensor readings for changes in flow rate by conventional means(not shown) .
  • Fluid exits the pilot line monitoring system through exit port 28.
  • Figure 1 further illustrates the treatment- additive control system of the present invention.
  • the optimum concentration of treatment-additive for the system is ascertained by determining the overlapping concentration range between the concentrations of treatment-additive that produce minimum turbidity readings in turbidity sensor 24 and the concentrations of treatment-additive that produce minimum turbidity readings in turbidity sensor 27. Signals from the detectors are converted to digital signals that are sent to processor 30 by means of lines 29.
  • Processor 30 is programmed to determine the overlapping concentration range between the concentrations of treatment-additive that produce a minimum turbidity reading in turbidity sensor 24 and the concentrations of treatment-additive that produce minimum turbidity readings in turbidity sensor 27 by varying the pump rate of pilot line feed pumps 35, 36, 37 that feed the pilot line monitoring system fluid, storing the concentration of treatment-additive added to the pilot line wastefluid by the pilot line feed pumps in memory storage, and to send signals to the main fluid feed pump(s) 31 which control (s) the amount of a treatment-additive(s) added to the main flow of the wastefluid treatment system, by means of adjusting the pump rate of the main feed pumps 31.
  • contaminated fluid is withdrawn from the main conduit after it is treated with treatment-additive.
  • the rate of flow of the treatment- additive treated fluid into the detection system is controlled by pump 112.
  • Part of the treatment-additive treated fluid is directed through flow meter 123 to unfiltered turbidity sensor 124.
  • Another part of the fluid is directed through filter 121, through flow meter 126, and past filtered turbidity sensor 127.
  • the turbidity measure ⁇ ments of the sensors is corrected for flow .rate to the meter.
  • the corrected readings are sent to processor 130 which is programmed to determine the overlapping concentration range between the concentrations of treat ⁇ ment-additive that produce a minimum turbidity reading in turbidity sensor 124 and the concentrations of treatment-additive that produce minimum turbidity readings in turbidity sensor 127 and to send signals to the main feed pump(s) 31 which control the amount of a treatment-additives added to the main flow of the wastefluid treatment system, by means of adjusting the pump rate of the main feed pumps 31.
  • EXAMPLE 1 The present invention was employed to determine its effectiveness in ascertaining the optimum detackifier concentration in the clarification of scrubbing water in a paint booth operation.
  • Detackifier (DT 2438, melamine formaldehyde) was added to paint sump waste. The turbidity of the contaminated fluid was determined after the addition of the detackifier.
  • the detackifier treated fluid was then filtered through a 5 micron fiber filter and the turbidity of the detackified, filtered fluid determined. As shown in Figure 3, the turbidity of the unfiltered samples was at a minimum at approximately the same concentration range of detackifier at which the turbidity of the filtered samples first reached a minimum turbidity. Outside of this range, the turbidity of the 'unfiltered samples increased significantly at the expense of increasing detackifier usage.
  • EXAMPLE 2 The present invention was further employed to determine its effectiveness in determining the optimum coagulant concentration for use in the clarification of wastewater from a manufacturer of marine motors.
  • the contaminated fluid which was treated contained substantial concentrations of oils (10-500 ppm) and suspended solids (10-lOOppm) .
  • Coagulant (KA 2400, amino methylated tannin) was added to the wastewater.
  • the turbidity of the fluid was determined after the addition of the coagulant.
  • the coagulant-treated fluid was then filtered through a 5 micron fiber filter and the turbidity of the resultant fluid determined.
  • the turbidity of the unfil ⁇ tered samples was at a minimum at approximately the same concentration range of coagulant at which the turbidity of the filtered samples first reached a minimum turbidi ⁇ ty. Outside of this range, the turbidity of the unfiltered samples increased significantly at the expense of increasing coagulant usage.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

L'invention concerne un appareil et un procédé pour optimiser l'adjonction de coagulant et de floculant chimiques dans un système de traitement de fluides résiduels, ce procédé faisant appel à deux détecteurs paramétriques ou davantage, réagissant à la concentration en contaminant, pour quantifier le paramètre mesuré dans le fluide résiduel traité chimiquement, et dans le fluide résiduel traité chimiquement et dont les matières solides ont été séparées.
PCT/US1996/006862 1995-06-07 1996-05-14 Systeme continu de surveillance en ligne pour optimiser l'adjonction de coagulant et de floculant dans des eaux residuelles et dans les systemes de cabines de peinture par pulverisation WO1996041245A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU57470/96A AU5747096A (en) 1995-06-07 1996-05-14 On-line continuous monitor to optimize coagulant and floccul ent feed in wastewater and paint spray booth systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US48517595A 1995-06-07 1995-06-07
US08/485,175 1995-06-07

Publications (1)

Publication Number Publication Date
WO1996041245A1 true WO1996041245A1 (fr) 1996-12-19

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004088306A1 (fr) * 2003-04-02 2004-10-14 Kemira Oyj Determination de substances dissoutes et colloidales nefastes pour la fabrication du papier
WO2015103291A1 (fr) * 2013-12-31 2015-07-09 Icm, Inc. Procede de separation
ES2566978A1 (es) * 2014-10-16 2016-04-18 Bernardo DÍAZ MARTÍNEZ Dispositivo de control de la floculación en una corriente de lodos o fangos y sistema para controlar la floculación mediante la adición de reactivo floculante en dicha corriente de lodos o fangos

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3605775A (en) * 1969-11-18 1971-09-20 Gen Am Transport Method to control dosage of additive into treatment process and automatic device therefor
US3618766A (en) * 1970-01-23 1971-11-09 Taulman Co The Water treatment
US3693797A (en) * 1970-05-08 1972-09-26 George J Topol Apparatus for adding material to liquids
US3731807A (en) * 1969-08-29 1973-05-08 Degremont Apparatus for automatically determining the optimum amounts of reagents to be added to a liquid for its clarification
US4277343A (en) * 1979-03-13 1981-07-07 Paz Jacob D Method for continuously monitoring and controlling alkalinity for environmental purposes using a pCO2 probe
US4576723A (en) * 1983-12-02 1986-03-18 Basf Aktiengesellschaft Estimation of the degree of dispersion in flowing concentrated dispersions
US4855061A (en) * 1988-04-26 1989-08-08 Cpc Engineering Corporation Method and apparatus for controlling the coagulant dosage for water treatment
US5192448A (en) * 1991-03-09 1993-03-09 Bayer Aktiengesellschaft Process for breaking oil-in-water emulsions

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731807A (en) * 1969-08-29 1973-05-08 Degremont Apparatus for automatically determining the optimum amounts of reagents to be added to a liquid for its clarification
US3605775A (en) * 1969-11-18 1971-09-20 Gen Am Transport Method to control dosage of additive into treatment process and automatic device therefor
US3618766A (en) * 1970-01-23 1971-11-09 Taulman Co The Water treatment
US3693797A (en) * 1970-05-08 1972-09-26 George J Topol Apparatus for adding material to liquids
US4277343A (en) * 1979-03-13 1981-07-07 Paz Jacob D Method for continuously monitoring and controlling alkalinity for environmental purposes using a pCO2 probe
US4576723A (en) * 1983-12-02 1986-03-18 Basf Aktiengesellschaft Estimation of the degree of dispersion in flowing concentrated dispersions
US4855061A (en) * 1988-04-26 1989-08-08 Cpc Engineering Corporation Method and apparatus for controlling the coagulant dosage for water treatment
US5192448A (en) * 1991-03-09 1993-03-09 Bayer Aktiengesellschaft Process for breaking oil-in-water emulsions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004088306A1 (fr) * 2003-04-02 2004-10-14 Kemira Oyj Determination de substances dissoutes et colloidales nefastes pour la fabrication du papier
WO2015103291A1 (fr) * 2013-12-31 2015-07-09 Icm, Inc. Procede de separation
ES2566978A1 (es) * 2014-10-16 2016-04-18 Bernardo DÍAZ MARTÍNEZ Dispositivo de control de la floculación en una corriente de lodos o fangos y sistema para controlar la floculación mediante la adición de reactivo floculante en dicha corriente de lodos o fangos

Also Published As

Publication number Publication date
AU5747096A (en) 1996-12-30

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