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WO1993004004A1 - Systeme informatise pour injection d'un produit chimique limitant la teneur en sulfure d'hydrogene d'un effluent d'eaux usees - Google Patents

Systeme informatise pour injection d'un produit chimique limitant la teneur en sulfure d'hydrogene d'un effluent d'eaux usees Download PDF

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Publication number
WO1993004004A1
WO1993004004A1 PCT/EP1992/001834 EP9201834W WO9304004A1 WO 1993004004 A1 WO1993004004 A1 WO 1993004004A1 EP 9201834 W EP9201834 W EP 9201834W WO 9304004 A1 WO9304004 A1 WO 9304004A1
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WO
WIPO (PCT)
Prior art keywords
hydrogen sulfide
waste water
water stream
stream
atmosphere
Prior art date
Application number
PCT/EP1992/001834
Other languages
English (en)
Inventor
Younes Javadi
Randy L. Jones
Douglas F. Werner
Original Assignee
Technolizenz Establishment
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 Technolizenz Establishment filed Critical Technolizenz Establishment
Publication of WO1993004004A1 publication Critical patent/WO1993004004A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
    • G01N33/0044—Sulphides, e.g. H2S
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/54—Compositions for in situ inhibition of corrosion in boreholes or wells
    • 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

  • the system of the present invention relates to a process and apparatus for the monitoring and control of hydrogen sulfide gas in a waste water stream. More particularly, the present invention relates to a process and apparatus system for continuously monitoring the hydrogen sulfide concentration present in a waste water stream and controlling the quantity and time of automatically injecting a specified chemical into the waste water stream.
  • system' 1 used hereinbefore and hereinafter is intended to mean a combination of process steps and/or an apparatus comprising a combination of various means.
  • the present invention is directed to a computerized process for hydrogen sulfide control in a waste water stream, comprising the steps of: a) sampling a quantity of atmosphere from above a portion of the waste water stream; b) sensing whether the quantity of atmosphere sampled includes hydrogen sulfide gas therein; c) analyzing the concentration of hydrogen sulfide gas within the sampled air through the use of an analyzer; d) providing a specified quantity of dopant chemical compound into the waste water stream, the quantity depending on the level of hydrogen sulfide derived from the analyzer, to neutralize the H 2 S gas; and e) continously repeating steps a) through d) , to reduce concentrations of hydrogen sulfide sensed within the atmosphere above the stream.
  • the present invention is further directed to a computerized apparatus for controlling hydrogen sulfide in a waste water stream, comprising means for: a) sampling a quantity of atmosphere from above a portion of the waste water stream; b) sensing whether the quantity of atmosphere sampled includes hydrogen sulfide gas therein; c) analyzing the concentration of hydrogen sulfide gas within the sampled air; d) providing a specified quantity of dopant chemical compound into the waste water stream, the quantity depending on the level of hydrogen sulfide derived from the analyzer, to neutralize the H 2 S gas; and for e) continously repeating steps a) through d) , to reduce concentrations of hydrogen sulfide sensed within the atmosphere above the stream.
  • the process and the apparatus for performing it comprise the following steps and means, respectively: a) Sampling by means of pump devices for removing a predetermined portion of the atmosphere above the waste water stream. b) Sensoring by means of a hydrogen sulfide sensor, e. g. a ceramic material coated with a metal, such as silver, copper, iron or the like, which is sensitive to hydrogen sulfide and decreases its resistance to an electrical current depending on the amount of hydrogen sulfide passing through it thus allowing the flow of a higher electrical current. As the sensor has an exponential curve it is controlled by a computer with a specific software package. c) Analyzing, i. e. determining the amount of hydrogen sulfide gas in the atmosphere above the waste water stream, comprises the use of a controller and the corre ⁇ sponding software package for the computer.
  • Providing a specified, calculated quantity of dopant chemical into the waste water comprises the use of a controller signaling to a pump the amount of dopant chemical to be pumped into the waste water for neutralizing the hydrogen sulfide.
  • FIG. 1 illustrates an overall diagrammatical view of the preferred embodiment of the system of the present inven ⁇ tion
  • FIGS. 2 and 3 are flowchart diagrams illustrating operation of the controller of FIG 1;
  • FIG. 4A and 4B are graphs illustrating a curve demon ⁇ strating the operation of the sensor of FIG. 1.
  • FIG. 1 illustrates the preferred embodiment of the system of the present invention by the numeral 10.
  • a waste water stream 12 which comprises a stream of fluid such as a sewerage stream from a municipality sewerage plant, but may also include any fluid stream which may have hydrogen sulfide (H 2 S) gas entrained therein, said gas being released to the atmosphere 14 above the stream (Arrows 15) mainly at a pH of above 7.
  • a collection zone 16 through which a sample line 18 carries a specified quantity of the atmosphere 14 above the waste water stream 12 in the direction of Arrows 20. The sample contained within line 18 is moved, through the use of a sample pump 22, and is introduced into a hydrogen sulfide gas sensor 24.
  • the controller sample pump 22 which is used to pump the sample atmosphere 14 to the sensor 24, is desirably installed near a lift station/manhole to deliver a preset volume of air sample to the sensor manifold.
  • the hydrogen sulfide control concentration is then calculated.
  • the sample line 18 may be located to draw directly from the waste water stream 12, with the entrained gas being released or removed prior to reaching the sensor 24, with the gases then being analyzed by the sensor 24.
  • the sensor 24 is contained within a hydrogen sulfide gas analyzer or control means 26, which is controlled by a computer software.
  • a flowchart diagramm illustrating the operation of the software is shown in FIGS. 2 and 3 and is discussed further below.
  • the control means 26 preferably comprises a controller which includes a microcomputer, such as the 80196 MICROCONTROLLER 11 from INTEL CORPORATION, analog inputs, pulse with modulated outputs, a modem, a terminal interface, various relay driver circuitry and an interface to a display.
  • a microcomputer such as the 80196 MICROCONTROLLER 11 from INTEL CORPORATION
  • analog inputs such as the 80196 MICROCONTROLLER 11 from INTEL CORPORATION
  • analog inputs such as the 80196 MICROCONTROLLER 11 from INTEL CORPORATION
  • analog inputs such as the 80196 MICROCONTROLLER 11 from INTEL CORPORATION
  • pulse with modulated outputs such as a modem, a terminal interface, various relay driver circuitry and an interface to a display.
  • the sensor 24 includes a sensor chamber (not shown) where gas samples may be evaluated. Following the specified sample of the gas being moved through the sensor 24, the gas is returned via the return line 28, in the direction of Arrows 29 to the atmosphere 14 above the waste water stream 12.
  • the sensor 24 is a typical sensor of the type manufactured by GENERAL MONITOR located in California.
  • the sensor 24 includes an ML-224-C H 2 S gas analyzer and a Model S-H100 hydrogen sulfide sensing element, both developed by MICROLINE CONTROLS, INC., located at 12999 Murphy Road, Suite B-7, Stafford, Texas 77477.
  • the controller means 26, for purposes of construction, contains the sensor 24.
  • the senor 24 senses the presence of H 2 S gas within, the sample, the sensor 24 provides a voltage signal to the controller 26, utilizing the software provided in the system, and the amount of hydrogen sulfide gas is quantified.
  • the sensor 24 preferably includes three valves (not shown) which are controlled by the controller 26 and are used for various operations.
  • the sensor 24 includes a reference gas valve which connects to a tube containing a reference gas having a preset concentration of H 2 S. This tube is used in determining the transfer characteristic curve of sensor curve (FIGS. 4A and 4B) , which reflects the operation of the sensor 24.
  • the sensor 24 also preferably includes an outside air valve which opens to the outside air, which is used to purge the sensor chamber of H 2 S and also to aid in determining the characteristics of the sensor curve. As is explained below, the operation of the sensor 24 varies during its lifetime, and thus the sensor curve is continually updated to properly reflect the current operation of the sensor 24.
  • the sensor 24 includes a sample gas valve which connects the sample line 18 to the sensor chamber to allow samples of the atmosphere 14 to be evaluated.
  • a flowchart diagram illustrating the operation of the software in the controller 26 is shown. The flowchart is shown in two portions for clarity, and interconnections between the two Figures are referenced by the circled letters A and B. The flowchart is for operation with a single sensor only, with conversion to a dual sensor readily apparent to one skilled in the art.
  • the controller 26 On power up or reset, the controller 26 begins in step 102 and displays a number of variables and reads any input data provided by an operator. The operator will provide information relating to the dopant amine chemical, such as concentrations and pump rates, to the various alarm levels and other preset conditions.
  • step 104 the controller 26 performs a self test and, if an error occurs, displays an error message.
  • step 106 the controller 26 determines if 15 minutes have elapsed since the controller 26 was turned on. The sensor 24 generally requires a 15 minute warmup time before it may begin operation. If 15 minutes have elapsed, the controller 26 advances to step 112. If 15 minutes have not yet elapsed, the controller 26 advances to step 108.
  • step 108 the controller 26 determines if an interrupt has been generated, reflecting whether an operator has input or changed certain variables with regard to the operation of the system. It is noted that the interrupt will generally be asynchronous. However, the interrupt is represented as a step in the flowchart for clarity.
  • step 110 the controller 26 advances to step 110 where it receives the data input from the user and sets variables accordingly. If an interrupt has not been generated, the controller 26 returns to step 102 and repeats the sequence of steps 102-110 until the 15 minute warmup time has completed.
  • step 112 the controller 26 opens the outside valve to the outside air and transfers the outside air into the sensor chamber to perform an auto zero function.
  • FIGS. 4A and 4B a graph illustrating the curves which represent the transfer characteristic of the sensor 24, referred to as the sensor curve, is shown.
  • the graph plots the voltage output from the sensor 24 versus the parts per million (ppm) concentration of H 2 S in the gas being evaluated.
  • ppm parts per million
  • the outside valve is opened to allow outside air into the sensor chamber.
  • This outside air contains no H 2 S and is used to find the voltage output of the sensor 24 when a gas containing zero H 2 S is applied to the sensor 24.
  • the controller 26 determines the zero point of the transfer characteristic or the sensor curve of the sensor 24.
  • the controller 26 opens the reference gas valve to the tube containing the reference gas having a preset concentration of H 2 S, preferably approximately equal to the desired maximum sensitivity range.
  • This valve is preferably opened for approximately 45 seconds to build up the concentration of H 2 S in the sensor chamber to saturate the sensor 24 with the maximum amount of H S that the sensor 24 can absorb.
  • the controller 26 reads the voltage output from the sensor 24 at this time to read the maximum voltage output or the high point of the sensor curve.
  • the controller 26 uses the information generated from this test to aid in formulating the sensor curve in Figure 4B.
  • step 116 the voltage output from the sensor 24, which passes through an amplifier stage in the contoller 26, is measured by the controller 26 to ensure that the amplifier includes sufficient gain to enable the controller 26 to read the voltage provided from the sensor 24.
  • the voltage output from the sensor 24 is in the millivolt range, and thus the amplifier is needed to ensure that a readable voltage is provided to the controller 26.
  • the amplifier has a lower gain during the early life of the sensor 24.
  • the contoller 26 determines the amount of gain provided by the amplifier and stores this data in memory.
  • the gain of the amplifier will be increased by the controller 26, so that the controller 26 receives a voltage output which is consistent with the ppm of H 2 S that is read by the sensor 24 and so that maximum accuracy from the analog/digital converter contained on the controller 26 can be maintained.
  • step 118 the controller 26 determines if the test results were properly received. If not, an error message is displayed in step 120, and the controller 26 repeats steps 112-116. If the test results were proberly received and stored, the contoller 26 advances to step 122. In step 122, the sensor chamber is purged of H 2 S by opening
  • the reference gas valve is opened for a small amount of time, preferably between 1 millisecond and 1 second, and the reference gas containing a fixed ppm of H 2 S is supplied to the sensor chamber during this brief period of time.
  • the voltage output is read by the controller 26 during this time, and the controller 26 uses the rate of change of the voltage produced by the sensor 24 in response to this reference gas to determine the slope of the sensor curve.
  • the length of time that the reference gas valve remains open depends upon the age of the sensor, i.e., the controller 26 will maintain the reference gas valve open for a longer period for an older sensor because an older sensor generally requires a longer amount of time to respond to the reference gas.
  • the controller 26 maintains the reference gas valve open until a desired change occurs in the voltage produced by the sensor 24.
  • the controller 26 uses this change to determine the slope of the reference curve. Also, it is generally not important whether the sensor 24 is operating at the zero point of the sensor curve during this test since the reference gas valve is generally open for less than 1 second and the slope of the curve is what is being determined. Utlizing this information, the controller 26 adjusts the sensor curve in step 126 to closely match the operation of the sensor 24 for this particular measuring sequence. The controller 26 also uses this data to adjust the gain of the amplifier. Also, in step 126 the controller 26 stores respective data such as the minimum and maximum reading of the sensor curve, the average reading, etc. , in EEPROM (electronically erasable programmable read only memory) and in RAM.
  • the controller 26 advances from step 126 to step 128 (FIG. 3) , wherein the controller 26 opens the outside valve to the outside air to purge the sensor chamber.
  • the controller 26 monitors the sensor voltage output as the sensor chamber is purged in step 128 to determine the rate at which the chamber is purged, referred to as the clear rate. This data is used to ensure that the slope of the sensor curve is consistent with the prior reading performed in step 124.
  • the controller 26 makes minor adjustments to the sensor curve based on the clear rate determined in step 128. Also in step 130, the controller stores the generated data in memory.
  • step 132 the controller 26 determines the temperature of the sensor 24 to ensure that the sensor 24 is operating at the proper temperature, which is approximately 180° F ⁇ 5°. Here it is important that the sensor temperature remain in the prescribed range to ensure the integrity of the voltage readings supplied by the sensor 24.
  • step 134 the controller 26 determines if the reference gas temperature is adequate, i.e., if it is approximately equivalent to the ambient temperature in the relevant atmosphere 14 being tested. If not, the controller 26 returns to step 124 and repeats the operation performed therein. If the reference gas temperature adequately corresponds to the atmosphere temperature, the controller advances to step 136.
  • step 136 the controller 26 opens the reference gas valve to expose the sensor to the reference gas for the time period that the valve was opened in step 124.
  • the controller 26 monitors several variables, including time, voltage, ppm of H 2 S, and the gain of the amplifier and determines if the sensor is operating consistently with the manner in which the sensor operated in step 124 when this same test was performed. In effect, the controller 26 determines whether the sensor is operating to the sensor curve which was generated in the previous steps.
  • the controller 26 uses this information to recalibrate or do a final fine tuning of the sensor curve (FIG. 4A) to ensure that the curve more closely approximates the actual operation of the sensor 24.
  • the controller 26 also uses this information to adjust the gain of the amplifier.
  • the controller 26 advances from step 136 to step 138 where the outside valve is opened to enable the controller 26 to determine the clear rate of the sensor chamber.
  • the controller 26 uses this data to again adjust the sensor curve accordingly.
  • step 140 the controller 26 stores the relevant data generated by the tests in steps 136 and 138.
  • step 142 the controller 26 determines if an interrupt has been generated. If so, the controller 26 receives data input from an operator in step 144 and then returns to step 140. If no interrupt has been generated in step 142, the controller 26 displays recorded variables to the operator in step 146 such as the maximum and minimum clear rate, as well as other data relevant to the sensor curve.
  • step 148 the controller 26 performs the auto zero function to again determine the zero point of the sensor curve. This operation also purges the sensor chamber in the sensor 24.
  • the controller 26 then advances from step 148 to step 150 and opens the sample gas valve to the sample line 18, which carries a sample of the atmosphere 14 above the stream 12.
  • the sample of atmosphere 14 enters the sensor chamber, where the sensor 24 evaluates the concentration of H 2 S and provides a corresponding voltage to the controller 26.
  • the controller 26 receives the voltage and performs a track and hold operation.
  • the controller 26 then linearizes the received voltage. In this linearization step ⁇ , the received voltage is referenced to the final sensor curve to develop the corresponding ppm of H S value.
  • step 154 the controller 26 generates a signal to the computer 52 and display board 50 to display the ppm reading and the maximum, minimum, and average H 2 S concen ⁇ tration levels.
  • the controller 26 then advances from step 154 to step 156 where the controller 26 checks the H 2 S ppm reading to determine if the alarm 70 should be enabled. If so, the controller 26 generates the signal on line 68 to the alarm 70 in step 158, and the alarm light 70 is turned on. The controller 26 then' advances to step 160. If the ppm reading is such that the alarm 70 need not be turned on in step 156, the controller 26 advances to step 160, where it determines if the chemical injection pump 40 should be enabled to provide the chemical compound from the container 36 through line 42 into the waste water stream 12.
  • step 162 a pulse width modulated signal is generated to enable the pump 40 in step 164.
  • the width of the pulse in the PWM signal determines the length of time that the cemical injunction pump 40 provides the chemical compound to the waste water stream 12.
  • the signal parameters are based on the particular dopant chemical and concentrations in use at the particular location, this information having been previously provided by the operator.
  • the controller 26 then returns from step 164 to step 128. If the ppm reading is such that the chemical injection pump 40 need not be enabled in step 160, the controller 26 returns from step 160 to step 128.
  • the controller 26 repeats steps 128-164, preferably every 2 to 3 minutes, to continue to update the sensor curve and the amplifier gain and evaluate samples from the atmosphere 14 above the waste water stream.
  • the sensor curve is continuously calibrated so that the curve closely approximates the current operation of the sensor.
  • the gain of the amplifier is continuously adjusted to reflect the decreasing reponse of the sensor as the sensor 24 ages. In this manner, the controller 26 is able to more closely determine the correct ppm reading from the voltage output of the sensor throughout the lifetime of the sensor 24.
  • This continuous loop allows constant and accurate moni ⁇ toring of the H 2 S concentration to assist in maintaining levels below hazardous or dangerous points.
  • this control system for monitoring and controlling the presence of hydrogen sulfide gas within the atmosphere above a liquid stream could also be modified to monitor the quantity of hydrogen sulfide gas within the liquid itself, as opposed to the atmosphere above the liquid. It is foreseen that this system, with slight modifications as discussed hereinbefore, could be utilized in the same manner, and would therefore enable the monitoring of the system throug the fluid itself, rather than after the H 2 S gas has moved into the atmosphere above the stream.
  • the analyzer or controller 26 Upon the quantification of the hydrogen sulfide gas within the sample, the analyzer or controller 26 provides a voltage signal 32 to the chemical injection means 34 as illustrated.
  • the chemical injection means 34 comprises a chemical injection pump 40 and a tank 36 housing a dopant chemical 37. Based upon the hydrogen sulfide concentra ⁇ tion, a command is sent out to the chemical injection pump 40 to commence pumping certain volumes of chemical to reduce the hydrogen sulfide present.
  • the chemical injection pump 40 is desirably packaged in a NEMA7 weatherproof enclosure and installed in a protected environment.
  • the chemical injection pump 40 may be located at the same location as the sensor 24 or may alternatively be located to provide dopant chemicals to a location upstream of the location being monitored by the sensor 24. In the remote location case, appropriate communication circuitry is utilized.
  • dopant chemical means an active chemical reacting with and thereby neutralizing the hydrogen sulfide.
  • the dopant chemical comprises an amine-base-containing composition to be injected into the waste water stream.
  • the a ine containing compound utilized as the dopant chemical in the present invention may be obtained by any suitable method that will yield the desired dopant amine.
  • dopant amine is intended to mean the reaction product of a suitable aldehyd and a suitable primary amine. Said reaction product comprises mainly an immine (Schiff base) , to the N-C double bond of which hydrogen sulfide can add in a stable manner.
  • One particularly suitable method for producing said dopant amine is by reacting an aldehyde with a compound containing at least one functional primary a ino group.
  • the aldehyde compound useful in the present invention comprises at least one aldehyde group, and suitable aldehyde compounds include trimers of aldehydes such as, for example, paraformaldehyde and paraldehyde.
  • aldehyde will be of the formula:
  • RCH 0 (X) , wherein the group R is H or a substituted or unsubstituted hydrocarbon group.
  • the group R is selected such that the water solubility of the final dopant amine product is maintained.
  • R is selected from the group consisting of H and alkyl groups.
  • Illustrative non- limiting alkyl groups include C ⁇ to C 6 alkyl groups.
  • R is selected from the group consisting of H, -CH 3 , -CH 2 CH 3/ -CH 2 CH 2 CH 3 and CH 3 -CH(CH 3 )-.
  • the reactant amine utilized to make the dopant amine comprises at least one functional primary amino group.
  • the reactant amine compound is generally a substituted or unsubstituted hydrocarbon with at least one functional primary amino group.
  • the reactant amine compound is selected such that the water solubility of the final product is maintained.
  • the reactant amine utilized in the present invention may even comprise mixtures of the various reactant amines.
  • the reactant amine utilized in the present invention is selected from the group consisting of alkylene or polyalkylene amines, alkanolamines and mixtures thereof.
  • alkylene and polyalkylene amines suitable for use in the present invention are of the general formula:
  • n is an integer in the range of 0 to about .
  • alkylene and polyalkylene amines suitable for use in the present invention include those of the formual:
  • the dopant amine of general formula XIIIA When injected into the waste water stream, the dopant amine of general formula XIIIA will react with one or two molecules of H 2 S to form e.g. the following H S-addition product:
  • Alkanolamines that are preferred as the reactant amines of the present invention are of the general formula:
  • R* is a C j to C 4 hydrocarbon group, preferably a C- L to C 4 alkylen group.
  • alkanolamines that may be utilized in the present invention include those of the formula: H 2 N(CH 2 ) 2 OH (ethanolamine) ; H 2 NCH 2 CH(CH 3 )OH (isopropanola ine) ; H 2 N(CH 2 ) 3 OH (l, 3-propanolamine) ; and H 2 N(CH 2 ) 4 OH (1,4-n-butanolamine)
  • alkanolamines are ethanolamine and isopropanolamine.
  • alkanolamines of general formula XII will react with the aldehyde of general formula X to form the following dopant amines:
  • R-CH N-R'-OH (XIIIB) wherein R and R 1 are as defined above.
  • the dopant amine compound is contained within tank 36, with tank 36 having a line 38 extending downward at 39 into the compound contained within tank 36.
  • Line 38 is connected on its second end to a chemical injection pump 40, which has an injection line 42 leading into the sample zone 16 at an injection nozzle 44.
  • the reaction temperature does not exceed 150° F, and preferably be maintained at about 137° F.
  • an excess of aldehyde should be avoided.
  • the formaldehyde e. g. in the form of formalin
  • the reaction is preferably carried out in water. The aqueous solution of the formed dopant amine be used as such.
  • the chemical injection pump 40 upon the chemical injection pump 40 receiving a pulse width modulated (PWM) signal 32 from controller or analyzer 26, the chemical injection pump 40 removes a quantity of dopant chemical from container 36 based on the width of the signal pulse and injects the compound through line 42 into the waste water stream at nozzle 44 in the direction of arrows 46.
  • PWM pulse width modulated
  • This system enables the constant receiving of a sample of gas from the atmosphere above the waste water stream, sensing the presence of H S gas, quantifying the amount of H 2 S gas in a sample, and signalling the pump to inject a quantity of chemical into the stream to reduce the presence of gas above the stream.
  • the entire system is continuous and is controlled by the software contained in the controller or analyzer 26, which is described above.
  • a message display board 50 which displays the necessary information that an operator of this system needs in order to continue to operate and to monitor the operation of the system as it controls the quantity of H 2 S gas.
  • a computer 52 having a viewing monitor. An operator may use the computer 52 to view the information on the computer screen and to feed data into the controller 26, as the need arises. These means of monitoring the data are controlled by the controller 26.
  • control room 60 positioned directly above the waste water stream 12, which is utilized in the operation of monitoring of the stream.
  • a second H 2 S gas sensor 62 contained within the control room 60.
  • the data from sensor 62 is provided to the controller 26 via signal 66.
  • the controller 26 provides a second signal 68 to the control room 60 when the pressure of H S gas within the control room 60 reaches a critical level to activate a warning light 70 to warn anyone entering the room that the level of hydrogen sulfide gas within the • room may be at a dangerous level.
  • level indicator means 72 con ⁇ tained within tank 36 which constantly provides a signal 74 to the controller 26 so as to maintain a constant monitoring of the amount of compound contained within tank 36. Appropriate alarms are provided if the level goes below a present point.

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Abstract

Un procédé et appareillage permettent de surveiller en continu la concentration atmosphérique en sulfure d'hydrogène au-dessus d'un effluent d'eaux usées, tel qu'un égout, et de contrôler en quantité et durée l'injection d'un produit chimique spécifique dans l'effluent pour limiter la quantité de sulphure d'hydrogène susceptible de s'en évaporer. Ceci implique de prélever un échantillon d'air au-dessus de l'effluent; de faire passer l'échantillon au travers d'un capteur pour en déterminer la concentration en gaz de sulphure d'hydrogène; de déterminer la quantité de produit chimique de dopage à ajouter aux eaux usées; d'envoyer un signal depuis le circuit de contrôle à une pompe qui injecte une certaine quantité du composé chimique dans l'effluent pour en absorber en partie le sulphure d'hydrogène; de surveiller l'effluent en continu pour déterminer sa concentration en sulphure d'hydrogène après introduction du composé chimique; et, le cas échéant, de rajouter du composé chimique en continu selon la concentration en sulphure d'hydrogène de l'effluent.
PCT/EP1992/001834 1991-08-12 1992-08-11 Systeme informatise pour injection d'un produit chimique limitant la teneur en sulfure d'hydrogene d'un effluent d'eaux usees WO1993004004A1 (fr)

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US86443091A 1991-08-12 1991-08-12
US864,430 1991-08-12

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Cited By (3)

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FR2704061A1 (fr) * 1993-04-14 1994-10-21 Intevep Sa Procédé et appareil pour l'analyse de gaz dans un milieu.
WO1995014924A1 (fr) * 1993-11-29 1995-06-01 Technolizenz Establishment Systeme d'injection de produits chimiques pour la regulation de l'acide sulfhydrique dans des courants d'eaux usees
CN103592417A (zh) * 2013-11-12 2014-02-19 北京中科博联环境工程有限公司 一种连续自动测定疏松物料中氨气或硫化氢含量的装置

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