JP2546781B2 - Method for measuring concentration of organic matter in solution and method for treating solution using the method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the concentration of organic substances in a solution and a method for treating the solution using the method, and in particular, it is discharged from a fermentation factory such as a beer factory or a soft drink factory. The present invention relates to a method for determining an organic matter concentration in a solution by measuring a Brix value in a drainage solution containing fermentation raw materials such as sugars and semi-finished products / products, and a method for treating a solution using the measurement method.

[0002]

2. Description of the Related Art Conventionally, as wastewater flowing into a wastewater treatment equipment, for example, in wastewater solution containing fermentation raw materials such as sugar and semi-finished products / products discharged from fermentation factories such as beer factories and soft drink factories. BOD (Biochemi
cal Oxygen Demand) value and TOC (Total Organic Carb)
It is commonly used to determine the on value by chemical analysis. In these methods, in general, wastewater samples can be collected, pretreated, and manually analyzed to determine values. Based on these values, for example, the capacity of the wastewater treatment process to be performed thereafter can be determined. Settings and line switching according to processing capacity were performed.

However, such a manual analysis BO
There is a problem that measurement of D value and TOC value is complicated, and quick measurement cannot be performed, so that quick response cannot be taken in the line. In order to solve such a problem, various kinds are currently used. BOD meters and TOC meters that can be incorporated in-line and are compatible with online control are becoming popular.

[0004]

However, when the concentration of organic substances in the wastewater is measured in-line using such a BOD meter or TOC meter, the following inconveniences have occurred. That is, when a TOC meter is used, a method of injecting a sample of several 10 μl into a combustion column with a microsyringe and measuring infrared absorption of generated CO ₂ ,
It is vulnerable to the mixing of SS (Suspended Solid) in the waste water, requires an SS separation layer and filtration to prevent blockage of the sample drawing tube and syringe, and requires labor for maintenance. In addition, calibration with a standard solution is also required periodically, and carrier gas (CO ₂ -free N ₂ +
Replenishment of O ₂ gas is also essential.

When a BOD meter is used, a so-called biosensor is used, so that it is always necessary to check the change with time and reproducibility. Moreover, stains on the sensor membrane surface due to SS and pH buffer solution are used. It is also necessary to replenish and the operation is complicated.

Further, these measuring instruments are not only expensive in themselves, but once trouble occurs, it takes time for maintenance. Therefore, there has been a demand for development of a measuring instrument to replace them.

The present invention was devised under these circumstances, and its purpose is to provide the above-mentioned BOD meter and TOC.
A method for measuring the concentration of organic substances in a solution that does not adversely affect SS in wastewater, is inexpensive, easy to operate, and easy to maintain without using a meter, and a method for treating a solution using the method. To provide.

[0008]

[Means for Solving the Problems] In order to achieve such an object, the inventors of the present application have earnestly studied, and as a result, a correlation between a Brix value in a solution and an organic matter concentration can be obtained. It became clear and I asked for this in advance,
The inventors have found that the above problems can be solved by measuring the Brix value in a solution with a simple Brix meter, and have reached the present invention.

That is, the present invention is a method for measuring the concentration of an organic substance in a solution containing a sugar, in which the correlation between the Brix value in the solution and the concentration of the organic substance is obtained in advance. , The Brix value in the solution was measured to determine the concentration of organic substances in the solution.

Further, the method for treating a solution containing a sugar of the present invention is a method in which the correlation between the Brix value in the solution and the organic matter concentration is obtained in advance and the Brix value in the solution is measured. Determine the organic matter concentration in the solution, and based on the value of the obtained organic matter concentration, further adjust the organic matter concentration in the solution by adding nutrient salts to the solution or adding a solvent, and then adjust the concentration in the post-treatment process. It was configured to process the prepared solution.

[0011]

The method of measuring the concentration of organic substances in a solution containing a sugar of the present invention measures the Brix value in the solution by obtaining the correlation between the Brix value in the solution and the concentration of organic substances in advance. To obtain the concentration of organic substances in the solution.

In the method for treating a solution containing a sugar of the present invention, the correlation between the Brix value in the solution and the concentration of the organic substance is obtained in advance, and the Brix value in the solution is measured to measure the Brix value in the solution. Obtain the organic matter concentration, based on the value of the obtained organic matter concentration, further adjust the organic matter concentration in the solution by adding nutrients to the solution or adding a solvent,
Then, the solution whose concentration has been adjusted in the post-treatment step is treated.

[0013]

EXAMPLES Hereinafter, the concentration of organic substances in the solution of the present invention (TO
The measurement method of C) will be described by taking the beer lees dehydration waste liquid discharged from the beer lees dehydrator of a beer factory as an example of the solution to be measured. First, in the method of measuring the organic matter concentration in a solution, the correlation between the Brix value and the organic matter concentration (TOC) in the beer lees dewatering waste liquid is obtained in advance. That is, several kinds of beer lees dehydration waste liquid samples whose organic matter concentration (TOC) has already been measured are prepared, Brix values of these samples are calculated, and Brix value and organic matter concentration (TOC) in the beer lees dehydration waste liquid are obtained.
Find the correlation with. Here, the Brix value is a numerical value of the sucrose concentration determined by a so-called Brix meter. To measure the Brix value, generally, a few drops of the test solution are dropped on the prism surface of the Brix meter, the lid is placed on the prism surface, and the value is read from the viewing window. The field of view from the viewing window is divided into two parts, light and dark, and the boundary line is calibrated by reading the value indicating the graduation.

Correspondence between the Brix value and the organic matter concentration (TOC) in the beer lees dewatering waste liquid obtained by a concrete experiment is shown in Table 1 below. It should be noted that beer lees dewatering waste liquid having various concentrations depending on the type of beer to be charged can be easily obtained. Here, 10 types of beer lees dewatering waste liquid samples were prepared.

[0015]

[Table 1] A graph plotting the Brix value and the organic matter concentration (TOC) based on the data in this table is shown in FIG. From this graph, Brix value is X, organic matter concentration (TOC)
Is Y (mg / l), the correlation equation of the following equation (1) is obtained.

Y = 3043X + 3747 (1) The correlation equation (1) given as an example of such a case is obtained in advance. This makes it possible to measure the organic matter concentration in the solution by simply measuring the Brix value in the solution.

Next, a method of treating a solution using the method of measuring the concentration of organic substances in the solution while using the correlation equation (1) will be described.

The method of treating this solution will be described with reference to FIG. 2 by taking the beer lees dehydration waste liquid discharged from the beer lees dehydrator of the beer factory as an example of the solution to be measured and treated.

FIG. 2 is a schematic device diagram for controlling the concentration of the beer lees dewatering waste liquid. According to this figure, this device temporarily stores the beer lees dewatering waste liquid flowing through the beer lees dewatering waste liquid pipe 2. Raw water pit 10, a pump 11 for pumping up the beer lees dewatering waste liquid stored in the raw water pit 10, a pipe 13 serving as a flow path for the beer lees dewatering waste liquid pumped up by the pump 11, and through this pipe 13. A mixing tank 30 for adjusting the concentration of the sent beer lees dewatering waste liquid, a pump 32 and a pipe 34 for sending the beer lees dewatering waste liquid having the concentration adjusted by the mixing tank 30 to the wastewater treatment device of the next step. Is equipped with. Further, in the apparatus shown in FIG. 2, in order to adjust the concentration of the beer lees dewatering waste liquid, the pipe 20 into which the industrial water flows is connected to the pipe 13 serving as a flow path of the beer lees dewatering waste liquid via the control valve 21. They are in communication with each other, whereby industrial water is appropriately supplied to the mixing tank 30.

Further, in the middle of the pipe 13 serving as a flow path for the dehydration waste liquid of beer lees (before connecting with the pipe 20 into which industrial water flows), a Bri for measuring the Brix value is provided.
The x meter 17 is installed, and the opening / closing control of the control valve 21 that adjusts the inflow of industrial water is performed based on the value measured by the Brix meter 17.

That is, the Brix value of the beer lees dewatering waste liquid, which can be said to be the raw water flowing through the pipe 13, is measured by the Brix meter 17, and the measured Brix value is calculated by using the correlation equation (1) to determine the concentration of organic matter (TOC) in the solution. ). Then, if the organic matter concentration (TOC) value thus measured is set to the preset organic matter concentration (T
If it is larger than the OC) value, a signal is sent to the control valve 21 to mix industrial water to dilute the beer lees dewatering waste liquid.
Sent to. Then, the control valve 21 continues to open for the calculated predetermined time, the industrial water is supplied to the mixing tank 30, and the beer lees dehydration waste liquid is diluted in the mixing vessel 30, and as a result, the diluted beer lees dehydration waste liquid is discharged. Organic matter concentration (TO
The C) value becomes a preset organic matter concentration (TOC) value or a value less than that. When the beer lees dewatering waste liquid whose concentration has been adjusted in this manner is accumulated in a predetermined amount, the beer lees dewatering waste liquid is supplied from the pump 32 through the pipe 34 to a waste water treatment device for the beer lees dehydration waste liquid.

The concentration standard of whether or not to dilute with industrial water, that is, a preset organic substance concentration (TOC)
The reference value is set in consideration of the treatment capacity of the wastewater treatment device for the wastewater treatment liquid of beer lees, that is, the load on the wastewater treatment device, which is the subsequent treatment (after controlling the concentration of the dehydration waste liquid of beer lees). Therefore, if the organic substance concentration (TOC) value measured via the Brix meter 17 is smaller than the preset organic substance concentration (TOC) value, the subsequent dilution with industrial water is not performed. It is sent to the wastewater treatment equipment that is the treatment.

In the embodiments of the present invention, the beer lees dewatering waste liquid discharged from the beer lees dehydrator of a beer factory has been described as an example of the solution to be measured and treated. Other solutions containing sugars without limitation, such as soft drink factory effluents, sugar effluents,
Pulp waste liquor and the like can also be the subject of the present invention.

In addition, in the examples of the present invention, after measuring the Brix value, the concentration of the organic substance in the solution is obtained from this value, and water as a solvent is added if necessary based on the obtained value of the organic substance concentration. Although the example of adjusting the concentration of the organic substance in the solution has been described, the present invention is not limited to this example. For example, the nutrient salts may be added to the solution based on the value of the obtained concentration of the organic substance. By the way, in this case, the nutrient salts necessary for the microorganisms are not contained in the solution, and it is necessary to add the nutrient salts at a constant ratio to the organic matter.

[0025]

Industrial Applicability The method of measuring the organic matter concentration in the solution of the present invention is such that the correlation between the Brix value in the solution and the organic matter concentration is obtained in advance, and the Brix value in the solution is measured. I try to find the concentration of organic substances inside. Then, the method of treating a solution of the present invention, in advance, the correlation between the Brix value and the organic matter concentration in the solution is obtained, and the organic matter concentration in the solution is obtained by measuring the Brix value in the solution. Based on the calculated organic matter concentration value, further adjust the organic matter concentration in the solution by adding nutrient salts to the solution or adding a solvent, and then perform the treatment of the solution whose concentration has been adjusted in the post-treatment step. I have to. Therefore, compared with the conventional method, the method does not adversely affect the SS content in the wastewater, and is inexpensive, easy to operate and easy to maintain, and a method for measuring the concentration of organic matter in the solution, and a method for treating the solution using the method. A method can be provided.

[Brief description of drawings]

FIG. 1 is a graph in which a Brix value and an organic matter concentration (TOC) are plotted.

FIG. 2 is a schematic device diagram for controlling the concentration of a beer lees dehydration waste liquid.

[Explanation of symbols]

 10 ... Raw water pit 11 ... Pump 17 ... Brix meter 21 ... Control valve 30 ... Mixing tank

Claims (3)

(57) [Claims] 1. A method for measuring the concentration of an organic substance in a solution containing a sugar, which comprises obtaining a correlation between a Brix value in the solution and the concentration of the organic substance in advance, and measuring the concentration of the organic substance in the solution. A method for measuring an organic substance concentration in a solution, which comprises obtaining the organic substance concentration in the solution by measuring a Brix value. 2. A method of treating a solution containing a sugar, wherein the method determines the Brix value in the solution by previously obtaining the correlation between the Brix value in the solution and the concentration of the organic substance. Determine the organic matter concentration in the solution by, based on the value of the obtained organic matter concentration, further adjust the organic matter concentration in the solution by adding nutrient salts to the solution or adding a solvent, and then in the post-treatment step. A method of treating a solution, which comprises treating a solution of which concentration has been adjusted. 3. The method for treating a solution according to claim 2, wherein the post-treatment step is a wastewater treatment step.