JPS593699B2 - Biological treatment sludge discrimination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for determining the state of sludge in order to improve the efficiency and perform biological purification treatment of sewage.

In a biological treatment tank, if excessive aeration is performed, the activated sludge becomes finer, the pH decreases due to nitrogen oxidation, and phenomena such as settling sludge being thrown up occur, which impedes normal operation.

Furthermore, when filamentous fungi multiply, the activated sludge does not settle and a bulking phenomenon occurs. To prevent such abnormalities, the amount of aeration of the chemical-injected sample should be controlled. When the amount of activated sludge is constantly low, or when the load is generally high, a BOD source with a reduced amount of air is introduced. In such biological treatment, it is necessary to constantly monitor and control the condition, activity state, etc. of the organisms. The present invention was proposed for this purpose, and includes: a pipe through which treated water in a biological treatment tank flows; a piston that fits into the pipe to draw up water and clean the inner wall surface; It consists of a device for reciprocating a piston, a part of the pipe where the piston reciprocates as a detection part, a laser or soft X-ray irradiation device on one side, and a detector on the other side, and the pump is pumped by the pumping action of the piston. The state of the sludge is determined by irradiating light into the water stored in the pipe section that has been removed and cleaned, and detecting the transmitted or reflected light with a detector, and by detecting the scattered light while moving the detector at a predetermined angle. It is characterized by determining 20.

The present invention will be explained below with reference to an embodiment of the drawings. In Fig. 1, 1 is a pipe for sampling and distributing treated water in an activated sludge treatment tank, and 2 is a piston fitted in this pipe 1 for reciprocating motion. In step 25, the water is pumped out and the inner wall surface of the pipe is cleaned by sliding friction.

3 is a valve which opens the valve when the piston goes up and closes the valve when it goes down to pump water.

Reference numeral 4 denotes a magnetic iron core connected to the piston 2. When the external coil 5 is energized, the magnetic core 4 attracts and moves L30, and when the excitation is released, it returns by the spring 6. This is repeated by the intermittent energization of the coil 5, so that the piston 2 reciprocates. become.

T is a device that irradiates a laser or soft X35 ray from one side to the pipe where the piston 2 moves, that is, a detection part 9 made of a light-transmitting transparent material; 8 is a detector that detects the irradiated scattered light; While moving through an angle of 0 to 1800, light reception corresponding to the angle is detected. That is, the movement 44q of the detector 8
- As shown in Fig. 2, the movement is made by drawing an arc around the light point in the pipe 9 of the light beam irradiated to the irradiation device 8, and detecting the luminous intensity with respect to the receiving angle, so that the state of underwater sludge can be determined. There is.

The above device causes the piston 2 to reciprocate. , the water is pumped up and moved inside the vibrator 1 in the direction of the arrow.

If the excitation coil 5 is kept energized, the piston 2 will remain in the state shown in the figure, and the pumped water will fill the detection part 9.
When a laser is irradiated from the irradiation device 7, the light hits the microorganisms in the water and is reflected, scattered, and transmitted. Scattered light is determined by the amount of microorganisms, the types of microorganisms, ciliates, haustoria, flagellates,
There are various types of rhizopods, rotifers, etc., but the reflection and scattering state is different for each type.By detecting the scattered light at different angles, it is easy to determine the amount and type. 1. I can differentiate. The detector 8 can be rotated about 0 to 180 degrees around the detection part 9, and by performing a detection operation while moving the detector 8, it is possible to detect the scattered light intensity corresponding to the angle. If the detection signal is recorded by an X, Y recorder (not shown), the two states of sludge in the water can be easily distinguished. Figure 3 shows the state of microbial growth determined by graphing the intensity of scattered light against the detection angle.
When x106/ml is 5 x 105/ml, the scattered light intensity becomes high at any angle.

FIG. 4 shows the distribution of scattered luminosity of rotifers and ciliates at 100 μg/WLI, and FIG. 5 is a comparative measurement graph of water containing Sboa and bacterial water. By preparing such various graphs in advance, the type, mixing state, amount, etc. of microorganisms can be detected by comparing these with the values detected in the treated water during operation. can do. To determine the breeding status, if you identify the largest rotifer, you can roughly determine the increase/decrease status of the sludge as a whole.
By controlling based on this, stable processing can be performed. Of course, optical detection may also be performed using transmitted light to determine a change in the transmission state. However, as the detection and determination of the sludge state is repeated as described above, the microorganisms in the water adhere to the wall surface of the pipe 1 of the sampling flow path and multiply.

If they grow in large numbers, the light transmittance of the detection part 9 will be blocked and detection by light will no longer be possible, but the piston 2, which performs the pumping action, constantly slides and rubs against the wall surface of the detection part 9 while performing its reciprocating motion, thereby cleaning the detection part 9. and always maintain the best light transmittance. That is, since the detecting section is particularly provided in the area where the piston 2 slides, the piston also serves as a cleaning function for the detecting section, and thus the above-mentioned detection discrimination can be stably maintained.

In this way, the present invention irradiates pumped water with a laser or an FT X-ray while cleaning the detection part with the piston of the pump, detects reflected and transmitted light, and detects scattered light while changing the detection direction angle. Since the biological state is determined, stable determination can be continued, and it can be quickly detected whether the desired reaction is progressing to the target or not, and the corresponding control u Oxygen amount, reaction nutrient amount, PH value, temperature etc. can be controlled to optimal conditions.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a detailed diagram of a part thereof, and FIGS. 3 to 5 are discrimination graphs. 1 is a pipe, 2 is a piston, 3 is a valve, 4 is a magnetic core, 5
is an excitation coil, 6 is a spring, 7 is an irradiation device, 8 is a detector,
9 is a detection section.

Claims (1)

[Scope of Claims] 1. A pipe through which treated water in a biological treatment tank flows, a piston that fits into the pipe to draw up water and clean the inner wall surface, and a device for reciprocating the piston.
A part of the pipe where the piston reciprocates is used as a detection part, and consists of a laser or soft X-ray irradiation device on one side and a detector on the other. A biological treatment sludge discrimination device characterized by discriminating the state of sludge by irradiating light into water and detecting it with a detector. 2. The biologically treated sludge discrimination device according to claim 1, which detects scattered light from underwater microorganisms while moving a detector at a predetermined angle.