KR101275700B1 - Realtime analizing equipment for taste and odor matters(geosmin, 2-mib) in water using sparger - Google Patents

Abstract

PURPOSE: A real-time analyzer of geosmin and 2-MIB(2-methylisoborneol) using an on-line sparger is provided to accurately quantitate geosmin and 2-MIB in raw water and treated water of a purifying system, and to monitor the concentration of a matter which causes smell in a drinking water source. CONSTITUTION: A real-time analyzer of geosmin of 2-MIB which are matters causing foul taste and smell in the water comprises an on-line sparger(10), a thermodesorption device(20), and a gas chromatograph and mass analyzer(30). The on-line sparger draws raw water in real-time, heats the raw water by a heater, and generates bubbles by aeration of the raw water in a bubble generation tube. The bubble generation tube comprises a drain tube on the side. The thermodesorption device concentrates aerated bubbles. The gas chromatograph and mass analyzer isolates and detects a concentrated sample. The sparger comprises a drain chamber for collecting the raw water discharged from the drain tube.

Description

REALTIME ANALIZING EQUIPMENT FOR TASTE AND ODOR MATTERS (GEOSMIN, 2-MIB) IN WATER USING SPARGER}

The present invention relates to an analytical device used in a water treatment process, and in particular, analyzes Geosmin (hereinafter referred to as geosmin) and 2-Mehylisoborneol (hereinafter referred to as 2-MIB), which are taste and odor causing substances contained in raw water flowing into a water treatment process. The present invention relates to geosmin and 2-MIB real-time analysis device of taste and smell causing substances in water using an online sparger.

Taste- and odor-causing substances associated with water can be largely divided into artificial and natural elements. Taste and odor caused by anthropogenic factors are mainly caused by the outflow of pollutants to the water source, but since the frequency of occurrence is very low, odor generation in tap water is mostly naturally occurring by biological action.

Taste and smell substances caused by natural causes are mostly found to be caused by algae, and representative taste and smell substances include geosmin and 2-MIB.

Living algae produce 2-miB with geosmin during metabolism and store it intracellularly or cause some odors in the form of extracorporeal secretion and degradation product release.In particular, when the algae dies, It releases odor-causing substances to further increase odor generation.

Geosmin and 2-MIB are also produced by Actinomycetes. Actinomycetes are fibrous, single-celled bacteria that live primarily in soil and spill into rainwater to contaminate raw water.

Algae inflow in the water treatment process causes problems such as unpleasant taste and odor in drinking water, in addition to physical obstacles such as precipitation and filtration.

Taste and odor caused by algae are not removed by traditional flocculation and sedimentation treatment when many algae have multiplied, so most of them remain in the purified water, causing odor from tap water during summer when algae occurs. And impede the use.

It has been found that the main taste and smell substances caused by algae include geosmin, 2-MIB, β-cyclocitral, 3-methyl-1-butanol, and the most problematic substances in water treatment are It is geosmin and 2-MIB, and in Japan, 10 ng / L is set as the standard for drinking water treatment. In Korea, since July 1, 2009, geosmin and 2-MIB have been added as water quality monitoring items. .

Since geosmin and 2-MIB are chemically stable and resistant to oxidation, they are not easily removed by conventional methods of water treatment by flocculation sedimentation, and are powdered activated carbon (PAC) or granulated activated carbon (GAC). Activated Carbon) can be removed a lot.

Taste and odor-causing substances can stimulate the body's sensory organs even at very low concentrations of several ng / L. Depending on the type, the typical odor detection concentrations are 10 mg / L for sensitive people. Can smell even at 4 ng / L. To detect this, analytical equipment capable of analyzing trace levels is required.

Gas chromatography (GC) and gas chromatograph / mass spectrometry (GC / MS) are used for chemical quantitation and qualitative analysis of specific taste and odor causing substances such as 2-MIB and geosmin.

Taste and odor causing substances exist in the water at extremely low concentrations of several ng / L, and a large amount of interfering substances coexist, so it is important to select an appropriate analytical method for each substance when concentrating, quantifying and qualitatively.

Conventional techniques for monitoring taste and odor causing substances can be largely divided into sensory methods and instrumental methods.

The sensory method is a relatively simple method in which a certain amount of sample is placed in a flask, shaken forcibly, and immediately smelled.However, the measurement results vary depending on the subjective olfactory ability of the analyst, and the analysis takes a long time. impossible.

Instrument analysis includes Closed-Loop Stripping Analysis (CLSA), Purge & Trap, Liquid-Liquid extraction (LLE), Steam Distillation Extraction (SDE), Solid phase exreaction (SPE), Solid It can be divided into phase micro exreaction (SPME).

CLSA is the most widely used method for analyzing taste and odor-causing substances. It can analyze ng / L levels and is particularly effective for nonpolar substances, volatile organic substances and substances with moderate molecular weight. Stripping takes about two hours, so analysis time is long and automation and continuous measurement are difficult.

Purge & Trap is a non-polar, relatively low molecular weight volatile and can be applied to low solubility in water.

Although the extraction time is short, the sensitivity is lower than CLSA, but it is known to analyze up to several ng / L in Korea.

The LLE method is suitable for the extraction of less volatile substances, and has the advantages of a simple device and a wide extraction range of the substances.

SDE is an improvement of the principle of LLE, and recently, the CLSA method and the SDE method are analyzed in parallel to analyze taste and smell-induced impurity.

In the SPE method, 2-MIB and geosmine are adsorbed to a solid adsorbent during the inspection, extracted with dichloromethane, and the concentration of 2-MIB and geosmine is obtained using a mass spectrometer.

Instrumental analysis is also difficult to measure continuously because of its complex pretreatment and analysis time.

Conventional sensory method and instrumental analysis method is a method that the operator of the water purification plant directly collects raw water and analyzes it, and it is impossible to measure continuously, complicated pretreatment for analysis, takes a long time, and impairs water treatment when large amounts of taste and odor causing substances are introduced. It is not possible to respond.

When a large number of algae grow in domestic water purification plants, if taste and odor causing substances are not removed in the water treatment process and remain in drinking water, existing monitoring methods cannot continuously measure taste and odor causing substances. · There is a problem such as delayed on-site response, such as whether or not to decide whether or not to input the drug to treat the smell-inducing substance.

Patent No. 10-0883035 has been proposed to solve this problem.

Patent No. 10-0883035 is a device for real-time monitoring of 2-MIB, which is a taste and odor causing substance, and a first measuring unit for measuring chlorophyll-a in raw water in real time using a fluorescence measurement method and pH of raw water. A second measuring unit for measuring in real time, a calculation unit for calculating the 2-MIB concentration using the values measured from the first and second measuring unit and a display unit for displaying the calculated 2-MIB concentration.

Apparatus for real-time monitoring of 2-MIB, which is a taste and smell-causing substance according to Korean Patent No. 10-0883035, can continuously measure 2-MIB concentration in real time, the measuring method is simple, It has the advantage of being able to quantitatively determine the taste and smell of raw water and final treated water.However, only 2-MIB can be measured, so it is not possible to measure geosmin which is more frequently detected in water and causes problems. have.

In addition, since chlorophyll-a contained in raw water is measured by fluorescence measurement method, and the pH of raw water is measured in real time to calculate 2-MIB concentration, it is also difficult to calculate accurate 2-MIB concentration.

Registered Patent 10-0883035 (2009.02.09)

The present invention is to overcome the above-mentioned conventional problems, an object of the present invention is to taste and smell causing substances that can be analyzed quantitatively and precisely by analyzing the taste and smell causing substances geosmin and 2-MIB in real time It is to provide a phosphorus geosmin and a 2-MIB real-time analyzer.

This object of the present invention using the online sparger, the taste of the water, the smell-inducing agent geosmin and 2-MIB real-time analysis device draws the raw water in real time to heat the raw water with the heater 12, using the gas An online sparger 10 for aeration of the raw water in the bubble generating tube 14 to make the bubble 15; A heat desorber 20 for concentrating and automatically desorbing the aerated bubbles 15; Gas chromatograph / mass spectrometer 30 for separating and detecting the concentrated sample 25;

In addition, the sparger 10 may further include a drain chamber 17 in which a sample discharged from the drain pipe 16 collects and a flow meter 18 for measuring the amount of raw water.

According to the above-mentioned problem solving means, the geosmin and 2-MIB real-time analysis device using the on-line sparger, the taste and smell causing substance in the water is applied to the geosmin and 2-MIB of the raw water and treated water of the purified water treatment system in the field application. There is an advantage that can be analyzed quantitatively and accurately together.

In addition, by transmitting the data to the situation room in real time, it is possible to monitor the concentration of odor-causing substances in drinking water, which is difficult to monitor by the existing analysis system, at least 1 hour, especially during nights and weekends when people are not working. It is possible to know whether taste or odor-causing substances are generated in raw water promptly, and thus, it is possible to promptly take countermeasures such as strengthening water purification treatment of water purification plant, thereby minimizing damage such as deterioration of tap water quality caused by taste and odorous substances. .

1 is a connection diagram of a real-time analysis device of geosmin and 2-MIB which is a taste and smell causing substance in water using an online sparger according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating an online sparger in FIG. 1;
FIG. 3 is a flow chart illustrating PRE-PURGE of the heat desorber of FIG. 1;
4 is a flow chart of bubble condensation of the thermal desorption unit in FIG.
5 is a flow chart of the sample analysis of the thermal desorption unit in FIG.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

Like reference numerals refer to like elements throughout the specification.

Hereinafter, with reference to the accompanying drawings, geosmin and 2-MIB real-time analysis device of the taste and smell causing substance in the water using an on-line sparger according to a preferred embodiment of the present invention, some components irrelevant to the gist of the invention Is omitted or compressed, but the omitted configuration is not necessarily a configuration that is not necessary in the present invention, it can be used in combination by those of ordinary skill in the art.

The reason why geosmin and 2-MIB were selected as indicators of taste and odor causing substances is because they are most frequently detected among taste and odor causing substances in influent water from domestic water treatment plants.

In the existing water treatment process, it is difficult to treat geosmin and 2-MIB, so powdered activated carbon is used, and chemicals are injected by the subjective judgment of the driver without a decision-making method for determining when to use powdered activated carbon.

Unlike in Korea, in Japan, 2-MIB is regulated by drinking water quality standards.

FIG. 1 is a diagram illustrating a connection between geosmin, which is a taste and smell causing substance in water, and a 2-MIB real-time analyzer using an online sparger according to an embodiment of the present invention, and FIG. 2 is a sparger 10 of FIG. ).

Geosmin and 2-MIB real-time analysis device (1), which is a taste and smell causing substance in water using an online sparger according to an embodiment of the present invention, is an online sparger (10), a thermal desorber (20), and a gas chromatograph / It consists of a mass spectrometer 30.

Conventionally, the water purification plant operator directly collects and analyzes raw water, but the online sparger 10 may draw in and analyze the raw water in real time.

As shown in FIG. 2, raw water flows into the online sparger 10.

Inflow of raw water is passed through the flow meter 18, it is possible to adjust the amount of raw water flowing in the flow meter (18).

The raw water passing through the flow meter 18 is heated by the heater 11, and the heated raw water is introduced into the bubble generating tube 14 through the raw water inlet tube 12, and several bubble generating tubes 14 are formed. Can be.

As the raw water flowing into the bubble generating tube 14 moves upward along the bubble generating tube 14 and reaches the height of the drain tube 16, it flows through the drain tube 16 to the drain chamber 17, and the drain chamber There is a certain amount of raw water in (17).

The drain chamber 17 is connected to the pipe (not shown) discharged to the outside.

Gas is introduced into the bubble generating tube 14 through the gas inlet tube 13 connected to the bubble generating tube 14.

As the gas passing through the gas inlet pipe 13 passes through the bubble generator (not shown) formed inside the bubble generator tube 14, bubbles 15 are generated.

The bubble generator is a collection of small particles, and bubbles 15 are generated as gas passes through the pores of the particles.

The generated bubbles 15 move upward along the bubble generating tube 14, and since the raw water is accumulated in the drain chamber 17, the bubbles 14 can not move to the drain chamber 17.

The bubble 15 exiting the bubble generating tube 14 is introduced into the thermal desorber 20.

FIG. 3 is a flow chart illustrating PRE-PURGE of the thermal desorber in FIG. 1.

As illustrated in FIG. 3, a cold trap 24 is formed inside the heat desorber 20.

Cold trap 24 serves to concentrate the geosmin and 2-MIB contained in the air bubbles flowing into a kind of concentrator.

PRE-PURGE is to remove dirt present in the heat desorber pipe for accurate analysis.

In the PRE-PURGE, bubbles 15 from the on-line sparger 10 go out through the pipe without the cold trap 24 installed.

In the PRE-PURGE, the transport gas is supplied to the gas chromatograph / mass spectrometer 30 through the transport gas bypass pipe 23 without passing through the cold trap 24. This is to ensure that the transport gas is continuously supplied to the gas chromatograph / mass spectrometer (30).

Figure 4 is a flow chart of the bubble concentration of the thermal desorption unit in FIG.

As shown in FIG. 4, bubbles from the on-line sparger 10 are heated by a heater (not shown) installed in the internal pipe of the thermal desorber 20, and the heated bubbles pass through the cold trap 24.

At this time, the sample 24 is condensed on the cold trap 24, and bubbles passing through the cold trap 24 flow out of the thermal desorber 20.

The transport gas is supplied to the gas chromatograph / mass spectrometer 30 through the transport gas bypass pipe 23 without passing through the cold trap 24.

FIG. 5 is a flow chart illustrating sample analysis of the thermal desorber in FIG. 1.

FIG. 5 shows the flow of fluid when the sample 25 concentrated in the cold trap 24 is sent to the gas chromatograph / mass spectrometer 30.

At this time, supply of the bubble 15 is stopped, and the transport gas is supplied through the transport gas pipe 26.

The transport gas sends the sample 25 concentrated in the cold trap 24 to the gas chromatograph / mass spectrometer 30 while moving the pipe. At this time, the cold trap 24 is heated instantaneously. This is for easily detaching the sample 25 concentrated in the cold trap 24 from the cold trap 24.

The concentration of geosmine and 2-MIB is measured using the sample 25 introduced into the gas chromatograph / mass spectrometer 30.

A mass spectrometer is a device that measures mass precisely by using accelerated ions to bend through an electric or magnetic field.

Mass spectrometers generally consist of a sample injection section, an ion source, a mass spectrometer, a detector, and a data processing device that controls them and stores the resulting data.

It can be used as a general gas chromatograph / mass spectrometer 30 in the market.

The display unit (not shown) displays the measured geosmin and 2-MIB concentrations.

The mass spectrometer 30 responds to the output of the comparator (not shown) and the comparator for determining whether the measured geosmin and 2-MIB concentrations are equal to or greater than a preset reference value, and the measured geosmine and 2-MIB concentrations are reference values. An abnormality is further provided with an alarm unit (not shown) which generates an alarm and outputs a control signal for controlling the timing of powder activated carbon and chlorine for processing a taste / odor causing substance.

The reference value refers to measured geosmin and 2-MIB concentrations of 10 ng / L or more and 1 hour or more.

The geosmin and 2-MIB real-time analysis device (1), which is a taste and odor causing substance in water using sparger, has a concentration of 10 ng / L for the concentration of geosmin and 2-MIB according to the measured grade of influx If more than 1 hour is detected, it provides an early warning of taste and smell-causing substances, decides when to add powdered activated carbon and chlorine, and it is effective for taste and smell-causing substances that cannot be removed by the existing water treatment process. Treatment can be achieved.

The comparison unit compares the measured concentration of geosmin and 2-MIB with the reference value and transmits the result to the alarm unit.

The alarm unit generates an alarm and control signal when the concentrations of geosmin and 2-MIB are higher than the reference value, and continuously monitors the concentrations of geocimine and 2-MIB if the concentration of the geosmin and 2-MIB is higher than the reference value.

What has been described above is just one embodiment for implementing the 2-MIB real-time analysis device (1) with geosmin, which is a taste and smell causing substance in the water using the online sparger according to the present invention, the present invention described above The present invention is not limited to the embodiments, and any one of ordinary skill in the art without departing from the gist of the present invention without departing from the gist of the present invention may be modified to the extent that various modifications can be made. There is a technical spirit.

1: Geosmin and 2-MIB real-time analysis device
10: online sparger 11: heater
12: raw water inlet pipe 13: gas inlet pipe
14 bubble generating tube 15 bubble
16: drain pipe 17: drain chamber
18: flow meter 20: thermal desorber
21: raw water piping 23: transportation gas bypass pipe
24 cold trap 25 sample
26: transport gas pipe 30: gas chromatograph / mass spectrometer

Claims (7)

delete Draw the raw water in real time to heat the raw water with the heater 11, aeration of the raw water in the bubble generating tube 14 using a gas to create a bubble (15), on the side of the bubble generating tube (14) An online sparger 10 further comprising a drain pipe 16;
A heat desorber 20 for concentrating and automatically desorbing the aerated bubbles 15; And
A gas chromatograph / mass spectrometer 30 for separating and detecting the concentrated sample 25;
Geosmin and 2-MIB real-time analysis device that is a taste and smell causing substance in the water using an online sparger, characterized in that it comprises a.
The method of claim 2,
The sparger 10 further includes a drain chamber 17 in which raw water discharged from the drain tube 16 collects, and a geosmin, which is a substance that causes taste and odor in the water using an on-line sparger, 2- MIB real time analyzer.
delete The method of claim 2,
A comparison unit determining whether the concentration of geosmin and 2-MIB analyzed by the gas chromatograph / mass spectrometer 30 is equal to or greater than a preset reference value; And
In response to the output of the comparator, an alarm for generating an alarm when the analyzed geosmin and 2-MIB concentration is equal to or greater than the reference value, and outputting a control signal for controlling the timing of powdered activated carbon and chlorine for the treatment of taste and odor causing substances. part;
Geosmin and 2-MIB real-time analysis device of the taste and smell causing substances in the water using an on-line sparger, characterized in that it further comprises.
6. The method of claim 5,
The reference value is a real-time taste and odor-causing agent of geosmin and 2-MIB in real time using an on-line sparger, characterized in that when the concentration of the analyzed geosmin and 2-MIB lasts 10 µg / L or more and 1 hour or more. Analysis device.
6. The method of claim 5,
The alarm unit is a geosmine and 2 inducing taste and odor in the water using an online sparger, characterized in that for outputting the control signal including the information to determine the amount of the powdered activated carbon and chlorine in accordance with the amount of raw water -MIB real time analysis device.

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