JPS5830385A - Purifying device for gas liquor - Google Patents

Abstract

PURPOSE:To purify gas liquor surely and to prolong the life of active carbon by mounting an absorptiometric analyzer to the main flow passage pipe behind the confluent point of the gas liquor passing through a purifying tank contg. active carbon and the gas liquor passing through a flow rate control valve. CONSTITUTION:After the gas liquor produced from a coke furnace is subjected to an activated sludge treatment and a flocculating and settling treatment, the liquor flows into the main flow passage pipe of a purifying device. Part of the gas liquor flows through a bypass flow passage pipe 4 according to the opening and closing of a flow rate control valve 5 and the balance passes through the inside of purifying tanks 3, 3 and is purified by active carbons 2, 2. The COD value contained in the joined gas liquor is detected continuously and automatically with an absorptiometric analyzer 6, and the COD value is controlled to a prescribed value. Namely, when the COD value exceeds a prescribed value, the detection signal is inputted to the valve 5 so that the flow rate of the gas liquor flowing in the pipe 4 is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ammonium water purification device that reduces the COD value of ammonium water and discharges the ammonium water.

Ammonium water generated from coke ovens contains various components and impurities. The various components in ammonium water are separated and recovered using predetermined equipment, and since the ammonium water that has been separated contains impurities, it is treated with activated sludge, coagulation and sedimentation, and then treated with activated carbon before being discharged. However, activated carbon's adsorption capacity gradually decreases as it circulates ammonium water, and the desired water quality cannot be obtained even after activated carbon treatment.For this reason, conventionally, the COD value of effluent water after activated carbon treatment was periodically (e.g. 1
The activated carbon is analyzed once a day) and the activated carbon is replaced based on the analyzed value.

This analytical method is called the 111M-potassium manganate method, in which a certain amount of potassium permanganate is added to ammonium water for analysis, and the permanganate is consumed after a heating reaction for a certain period of time. This is a method to find the amount of oxygen from the amount of force 11 um. However, this method is time-consuming because it is a manual analysis, and one analysis usually takes about two hours.

Furthermore, when determining when to replace activated carbon by analyzing it once a day, the analysis interval is long, so it is necessary to fully consider safety and replace the activated carbon at a value considerably lower than the target value. In addition, activated carbon has a high adsorption performance in the initial stage of use, so the adsorption performance deteriorates in a short period of time. For this reason, activated carbon must be replaced more frequently.

The present invention has been made in view of the above circumstances, and its purpose is to continuously and automatically detect the COD value and eliminate the trouble of analyzing it, as well as to reliably purify cheap water. Moreover, it is an object of the present invention to provide an ammonium water purification device that can prolong the life of activated carbon and extend its replacement cycle.

That is, the present invention provides a main flow pipe for ammonium water equipped with an activated carbon-containing septic tank, and a bypass flow pipe equipped with a flow rate control valve arranged in parallel. An absorbance analyzer for detecting the COD value in the ammonium chloride solution is attached to the main flow pipe after the confluence point with the water, and the flow control valve is opened and closed based on the detection signal of the analyzer. This is a purification device for ammonium water.

The present invention will be described below with reference to illustrative embodiments.

FIG. 1 is a system diagram of the ammonium water purification equipment.

In this purification treatment apparatus, a septic tank 3 containing activated carbon 2 is attached to a main flow pipe I through which ammonium chloride flows, and a bypass flow pipe 4 is arranged in parallel to the main flow pipe I. A flow control valve 5 such as an electromagnetic valve is attached to the bypass flow path pipe 4. The absorbance analyzer 6 is installed in the main flow pipe J [7 years old, Q after the confluence of the ammonium water that passes through the septic tanks 3 and 3 and the ansuzu-kichi that passes through the flow rate control valve 5. This absorbance analyzer 6 ,
The COD value in the ammonium water is detected based on the absorbance of the ammonium water, and the amount control valve 5 is opened and closed at θ1 based on this detection signal. This absorbance analyzer 6 has an absorption cell 9 (
A +- ultraviolet filter 10 and a visible filter 11 are arranged, and the electric signal from the element 8.8 is passed through the visible/external selection amplifier 12 and the logarithmic amplifier X3 to direct the light i1'1.
4. Note that 15 in the figure is a control section.

Reference numeral 16 designates an automatic cleaning variation measurement control circuit, 17 a light source control circuit, 18 a synchronous circuit, 19 a synchronous motor, and 20 a piston motor.

Although this absorbance analyzer 6 does not directly measure the COD value, when the analysis results of this absorbance analyzer 6 are compared with the results of manual analysis, a linear relationship is obtained as shown in FIG. 3. Therefore, it can be said that the analysis by this analyzer 6 is reliable.

Next, operation 5 of the purification treatment apparatus configured as described above will be explained.

The ammonium water generated from the coke oven is subjected to activated sludge treatment and coagulation sedimentation treatment, and then flows into the main flow pipe I of the purification treatment equipment.

A part of the ammonium water that has flowed here flows into the bypass channel pipe 4 according to the opening and closing of the flow rate control valve 5, and the rest passes through the septic tank 3.3 and is purified by the activated carbon 2.2. The purified ammonium water and the unpurified ammonium water flowing through the bypass flow path pipe 4 join together and enter the treated water [22], after which they are discharged.

However, in the present invention, COD contained in ammonium water after merging
The CO value is continuously and automatically detected by the absorbance analyzer 4.
The D value is set to a predetermined value. In other words, if the COD value exceeds a predetermined value, the detection signal is sent to the flow/volume control valve 5.
is input so that the flow rate of ammonium water flowing through the bypass flow path pipe 4 is reduced. Further, when the COD value is lower than a predetermined value, the flow control valve 4 is operated to increase the flow u1 of ammonium water flowing through the bypass flow pipe 4.

As described above, according to the present invention, when the adsorption performance of the activated carbon 2 is high, a small amount of ammonium water is poured here, and as the adsorption performance becomes low, the amount of ammonium water flowing here is increased so that the entire ammonium water is always kept at a predetermined level. The value is set to . Therefore, the degree of deterioration of the adsorption performance of the activated carbon is small.It is possible to make the activated carbon have a long life and to lengthen the replacement cycle of the activated carbon. Also C
Since the OD value is automatically detected and calculated, the time and labor required for analysis is not required as in the conventional method.

Also, COD values are continuously monitored at all times.

Effluent water can be purified reliably.

Next, examples of the present invention will be described.

In the purification apparatus shown in FIG. 1, ammonium water subjected to activated sludge treatment and coagulation and sedimentation treatment was flowed, and the flow surface, the flow rate flowing into the bypass flow pipe, and the COD value were measured. The results are shown in FIG.

As is clear from Figure 4, the COD value in the ammonium water was maintained at the desired value, and the replacement period for activated carbon was extended to 23 days.

On the other hand, when treated with the conventional method, the activated carbon replacement period is 1
It took only 0 days.

As described above, according to the present invention, the COD value is maintained constant based on the detection signal of the absorbance analyzer, thereby automating the process, improving work efficiency, and lengthening the replacement cycle of activated carbon. ]/This has the remarkable effect of lowering costs.

[Brief explanation of the drawing]

Figure 1 is a system diagram showing an example of a cheap water purification equipment;
Figure 3 shows the principle of the absorbance analyzer attached to the same device, Figure 3 shows the characteristics of the absorbance analyzer, and Figure 4 shows the COD value and bypass flow in an example using the purification equipment shown in Figure 1. It is a figure which shows the change with time of the ammonium water flow volume which flows into a pipe. I...Main flow pipe, 2...Activated carbon, 3...Septic tank,
4... Bypass flow path pipe, 5... Flow rate control valve, 6...
・Absorbance analyzer.

Claims (1)

[Claims] A bypass flow pipe equipped with a flow control valve is arranged in parallel to the main flow pipe of ammonium water equipped with an activated carbon-containing septic tank, and the junction of ammonium water passing through the septic tank, ammonium water passing through the flow rate control valve, and Nai is created. An absorbance analyzer for detecting the COD value in the ammonium water is attached to the subsequent main flow pipe, and a flow control valve is opened and closed based on the detection signal of the analyzer. Purification treatment equipment.