JPH02119998A - Sludge deodorizer - Google Patents

Abstract

PURPOSE:To enhance the deodorization efficiency by providing a means for supplying a deodorant to sludge, a means for integrating the signal from an odor sensor, and a means for operating a deodorant supply means based on the magnitude of the signal. CONSTITUTION:The output signals of the odor sensors 18-21 for a sludge odor are inputted to a computing element 32 through respective signal processors 28, 29, 30, and 31. A chemical injection amt. signal is outputted from the element 32 to a pump controller 33. The chemical injection pumps 36 and 37 provided to chemical tanks 34 and 35 are controlled by the controller 33 based on the signal, and a deodorizing liq. chemical is supplied to a sludge tank 1 and a flocculation tank 4 through pipelines 38 and 39. A semiconductor gas sensor or a controlled potential electrolysis-type gas sensor is used as the odor sensors 18-21.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sludge deodorizing device for deodorizing sludge by adding a deodorizing agent to the sludge. This invention relates to a sludge deodorizing device that controls an injection pump.

[Prior Art] In order to remove or prevent the odor generated from sludge, it is possible to add a deodorizing agent to the sludge in an amount proportional to the amount thereof, or to introduce the gas generated from the sludge to a gas treatment device 2. All of this gas is deodorized.

[Problems to be solved by the invention] In the method of adding deodorizing agent in proportion to the amount of sludge, the amount of deodorizing agent used becomes unnecessarily large, increasing the chemical cost. In this case, the gas processing equipment becomes large and the equipment cost increases.

In particular, if the odor-generating location is large, the amount of gas to be treated will be large, making it difficult to reliably treat the entire amount.

[Means for Solving the Problems] The sludge deodorizing device of the present invention includes a deodorizing agent supplying means for supplying a deodorizing agent to sludge, an odor sensor that detects the concentration of odor components generated from the sludge, and the odor sensor. The deodorant supplying means is provided with a signal processing means for integrally processing a signal from the deodorant supplying means, and a means for operating the deodorant supplying means based on the magnitude of the signal integrated by the signal processing means.

[Function] In the sludge deodorizing apparatus of the present invention, since a chemical solution is co-supplied to the sludge in an amount corresponding to the odor component concentration, it is possible to reliably perform sufficient deodorization treatment without using an excessive amount of chemical solution.

In the present invention, since medicine is dispensed based on the signal obtained by integrating the signal from the odor sensor, the detection output of the odor sensor may be affected by large changes in the concentration of odor components in a short period of time, or by the influence of wind generated in the atmosphere. Even if there is a sudden drop in
The fluctuation range of drug injection amount becomes smaller. As a result, the amount of medicine injected becomes an appropriate amount, and odor can be reliably prevented.

In the present invention, the chemical solution is supplied to the sludge itself, and the deodorizing effect is high, and the deodorizing equipment does not become unnecessarily large.

[Example] Examples will be described below with reference to the drawings.

FIG. 1 is a system diagram showing the configuration of an apparatus according to an embodiment of the present invention. In FIG. 1, the raw flow is introduced into a sludge tank 1 and stored therein. The sludge in the sludge tank 1 is introduced into the flocculation reaction tank 4 via the sludge pump 2 and piping 3, and is stirred by the agitator 5 while passing through the yJI collection tank 5a and the y11 collection pump 5.
b and a flocculant supplied via pipe 5C are added. The flocculated sludge is then introduced into, for example, a gravity dewatering section 6 of a belt press type sludge dehydrator 7, where it is subjected to gravity dewatering and then dewatered. The dehydrated sludge is carried out by a dehydrated sludge transport device 8.

Odor components such as hydrogen sulfide, methyl mercaptan, methyl sulfide, methyl disulfide, trimethylamine, and ammonia are generated from this sludge. The sludge tank i, the IA collection and reaction unit 4, the gravity dewatering section 6, and the dewatered sludge transport device 8 are equipped with sampling terminals 10 and 11 for sampling odors.
．． 12 and 13 are provided, each sampling tube 14
．． 15.16.17 are connected. Each sampling tube 14-17 passes through a section where an odor sensor 18.19.20.21 is installed and then passes through a gas pump 22.23.24.25.
It is connected to the. Each gas pump 22 to 25 has an exhaust pipe 2
It is connected to a deodorizer 27 via 6. In addition, in the dewatered sludge transport device, a sampling terminal device 13 is provided at a location within 10 cm from the sludge surface.

Each sampling tube 14 to 17 has a mist remover 14a, 15a, 16a, 17a and a dust filter 1, respectively.
4b, 15b, 16b, and 17b are provided. The mist removers 14a to 17a prevent mist from flowing toward the odor sensors 18 to 21, and the dust filters 14b to 1b prevent dust from flowing toward the odor sensors 18 to 21. is prevented. These mist removers 14a to 17a and dust filters 1'4b to
By providing 17b, odor sensors 18-2! Corrosion and dust adhesion are prevented, thereby improving the durability of the odor sensors 18 to 21 and preventing a decrease in detection sensitivity. The mist remover may be one with a built-in moisture absorbent such as silica gel, or one with a heater that vaporizes mist by heating. In the latter case, the pipe line downstream of the heater may be insulated. It is preferable to apply wood.

The output signals of the odor sensors 18 to 21 are input to the computing unit 32 via signal processors 28, 29, 30, and 31, respectively. A chemical injection amount signal is outputted from the calculator 32 to the pump controller 33, and the pump controller 33 controls the chemical injection pump 36.3 provided in the chemical liquid tank 34.35 based on this signal. and piping 38.
A deodorizing chemical solution is supplied to the sludge tank 1 and the flocculation reaction tank 4 via the sludge tank 39.

In the present invention, the deodorizing agent is an isothiazolone bactericide and NaCjZO.

NaCl102. H202, Zn salt, Fe salt, etc. are suitable, but other deodorants may also be used.

In this embodiment, semiconductor gas sensors or constant potential electrolytic gas sensors (of course, other sensors may be used) are used as the odor sensors 18 to 21, and a signal having a magnitude corresponding to the concentration of odor components is generated. The odor sensor 18~
It is output from 21. The signal processors 28 to 31 convert this signal into a voltage signal and output it to the calculation unit 1132.

The computing unit 32 is provided with an integration circuit, and a signal obtained by integrating this manually input voltage signal is output to the pump controller 33 as a signal indicating the amount of deodorizing agent to be supplied to the sludge tank 1 and the coagulation reaction tank 4. be done. Pump controller 3
3, the motors of the pumps 36, 37 are energized to rotate the pumps 36, 37 in response to this signal.

FIG. 2 shows an example of a change in sensor output over time, and FIG. 3 shows an integrally processed arithmetic unit output signal. As shown in FIG. 3, even if the sensor output fluctuates greatly, the arithmetic unit output fluctuates gently. Then, the pump controller 33 operates the pumps 36 and 37 so that the pump discharge amount corresponds to the magnitude of this integral circuit output signal. Therefore,
Even if the sensor output fluctuates greatly momentarily, the change in the amount of medicine dispensed will be small, resulting in unnecessary dosing of an excessive amount of medicine, or
On the other hand, problems such as insufficient amount of medicine to be injected are eliminated.

In the above-described embodiment, when controlling the amount of chemical injection into the sludge tank 1, the odor in the sludge tank 1 is detected by the odor sensor 18.
The drug injection pump 36 can be controlled based on this detected value. Further, the sludge tank chemical injection pump 36 may be controlled based on the detected values of any one or more of the odor sensors 19, 20, and 21.

When controlling the amount of deodorant medicine injected into the flocculation reaction Iff 4, the odor intensity in the flocculation reaction 4g4 is detected by the odor sensor 19, and based on this detection signal, the flocculation reaction tank chemical injection pump 37 is controlled. can be controlled. In addition, the odor sensor 18.
The aggregation reaction tank chemical injection pump 37 may be controlled based on one or more detection signals of 20.21.

In addition, in the above sludge deodorizing equipment, the sludge tank! Since the deodorizing agent is directly supplied to the sludge in the flocculation reaction tank 4, it is possible to directly prevent odor from being generated from the sludge. Therefore, the odor prevention effect is excellent, and the equipment is smaller and the equipment cost is lower than that which treats all the odor gas generated. In addition, since the amount of deodorant supplied is controlled according to the strength of the odor generated,
The amount of deodorant used is appropriate, and there is no need to oversupply, resulting in low chemical costs.

The device of the present invention can be applied to various facilities such as biological treatment tanks such as aeration tanks, human waste storage tanks, and sludge treatment facilities in various facilities such as human waste treatment plants and sewage treatment plants.

[Effects] As described above, according to the sludge deodorizing device of the present invention, even if the detected value of the odor sensor varies momentarily and greatly, the amount of chemical injection changes smoothly, so it is possible to prevent excessive chemical injection or conversely chemical injection. Shortages are prevented and odors can be reliably removed. Further, in the present invention, since the deodorizing agent is directly injected into the sludge, the generated gas itself has no odor.

Therefore, compared to deodorizing equipment that processes the entire amount of gas containing odors, the odor control equipment is smaller and the equipment configuration cost is lower.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing details of an embodiment of the present invention;
The figure is a sensor output waveform diagram, and FIG. 3 is an integration circuit output waveform diagram. ! ...Sludge tank, 4...711 collection reaction 40.
7... Sludge dehydrator, 8... Dehydrated sludge transport device, 1
0, 11, 12, 13... Sampling terminal device, 17... Sampling tube, 21... Odor sensor, 14, 15, 16. 18, 19, 20. 27... Deodorizer, 28, 29, 30. 32... Arithmetic unit, 33... Pump controller, 34.35... Chemical tank, 36.37... Chemical injection pump. 31...Signal lf! , burial,

Claims (1)

[Claims] (1) a deodorizer supply means for supplying the deodorizer to the sludge;
an odor sensor that detects the concentration of odor components generated from sludge; a signal processing means that integrates a signal from the odor sensor; and a deodorizer supplying means based on the magnitude of the signal integrated by the signal processing means. A sludge deodorizing device comprising means for activating the sludge.