JPS5823131B2 - Odeinonetsushiyoriniokel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing bad odors generated in sludge heat treatment equipment.

Conventionally, sludge heat treatment equipment has had major problems such as the bad odor of cracked gas generated in the reaction can and the bad odor of sludge after heat treatment.

As a method to solve this problem, we proposed a heat treatment method using low-temperature pressurization method [Patent Application No. 48-64113 (Japanese Patent Publication No.
5600)].

This heat treatment method heats the sludge introduced into the sludge heat treatment equipment can, i.e., the reaction chamber, to about 150°C to 165°C, and supplies compressed air to the reaction chamber to produce about 9 kg/kg of sludge.
The process is carried out under pressure of about crri.

This treatment method is well known, and another commonly used method is to heat it to about 200° C. and treat it in an anaerobic state without introducing air.

The method of heating to about 200°C in this way is generally called high-temperature processing, and the processing method of heating to about 150°C and pressurizing is generally called low-temperature pressing method. Although less hydrogen sulfide is generated than the high temperature method of heating to about 200° C., the method of the present invention was developed for the purpose of further improving the removal of bad odors by the above method.

The reaction can exhaust gas generated from conventional sludge heat treatment equipment has very complex components, mainly consisting of hydrogen sulfide, mercapcoins, and amines, and is extremely irritating, and the odor is unbearable due to its high concentration. That's about it.

In addition, due to the intermittent generation of exhaust gas from the reaction can, it was extremely difficult to monitor and control the odor.

In particular, as mentioned above, about 20 minutes without blowing compressed air.
In high-temperature treatment methods that heat to about 0°C, hydrogen sulfide is significantly generated.

The method of the present invention solves the above-mentioned problems. In the low-temperature pressurized heat treatment method, pressurized air (not shown) is blown into the heat treatment reaction chamber 2 shown in the attached drawing, so the decomposition odor generated from the heat treatment reaction chamber 2 is There is an advantage that the components and concentration of gas G2°g2 are significantly lower than in the conventional method because odor oxidation occurs with air.

Fortunately, the difference in H2S concentration is large, with the conventional method reaching 4500p.
In the above-mentioned low-temperature pressurization method, the amount of pII is less than 1 ppm.

In this way, the malodor components of the low-temperature pressurized type are mainly composed of total hydrocarbons and other components are low, making it possible to monitor malodors using a total hydrocarbon meter.

Hereinafter, malodor monitoring and control will be explained using the flow sheet of the attached drawings.

The locations where bad odors occur during the heat treatment of sludge are mainly the raw sludge concentration storage chamber 1, the heat treatment reaction chamber 2, the heat treatment sludge concentration chamber 3,
They are a dehydrator room 4 and a hopper room 5.

Offensive gas g1 in each of these rooms. - g5 are automatically checked for each malodor concentration using the hydrocarbon measuring device 6.

Raw sludge concentration storage chamber 1, heat treated sludge concentration chamber 3, dehydrator chamber 4
, malodorous gas G1 in each chamber of the hopper chamber 5. G3゜G4. G
5 is relatively low, so it is treated in the ozone deodorizing tower 7.

The malodorous gas G2, which is the decomposed exhaust gas from the heat treatment reaction chamber 2, has an extremely high concentration and is therefore directly combusted in the deodorizing furnace 8.

If there is a sludge incinerator nearby, the foul-smelling gas G2 can be treated by using it as air for sludge combustion.

Dly D3, D4, D5 are malodorous gases G1 in each room.
゜G3. G4. Damper that opens and closes the air passage of G5, 81~
s5 is a signal group transmitted from the hydrocarbon measuring device 6, which independently controls the opening and closing of the dampers D1 to D, respectively.

Note that the signal s2 controls the temperature of the deodorizing furnace 8 to remove bad odors.

This is because the malodorous gas G2 is extremely strong.

In the method of the present invention as described above, for example, the malodorous gas g1, that is, the concentration of hydrocarbons in the raw sludge concentration storage chamber 1 is observed by the hydrocarbon measuring device 6, and if the concentration exceeds a certain set limit value, the signal s1 is is transmitted, the damper D1 is opened, and the malodorous gas G1 in the raw sludge concentration storage chamber 1 is sent to the ozone deodorization tower 7.

It goes without saying that an alarm may be issued when the concentration of the malodorous gas g1, that is, the concentration of the malodorous gas G1, reaches a certain upper limit value.

The method of the present invention as described above is a low-temperature application type sludge heat treatment method in which malodorous gas Glt G2. G3 t G4
Malodorous gas g12g22g3 generated from the generation chamber of tG5
°g4. ! ! 5 is detected with a hydrocarbon measuring device 6, etc.
This method of removing malodorous gases in heat treatment of sludge is characterized in that the malodorous gases G1 to G5 are removed in the ozone deodorizing tower 7 and the deodorizing furnace 8 according to the detection signal, so that the malodorous gas removal efficiency is improved. There are significant practical effects, such as a significant increase in the amount of water.

Note that when the measured value of the amount of hydrocarbons in the hydrocarbon measuring device 6 is below the set limit value and the odor is low, each damper D1 to D
5 is kept closed, and the gas is introduced into a separately provided ventilation path and discharged into the activated sludge from a diffuser pipe of a known activated sludge treatment tank for treatment, or treated with a known water washing device and then released into the atmosphere. discharge.

[Brief explanation of drawings]

The drawings are flowcharts illustrating an embodiment of the method of the invention. G1. G2. G3. G4. G5...Odor gas, 6...Hydrocarbon measuring device, 7...
...Ozone deodorizing tower, 8...Deodorizing furnace, g12g2
2g32g42g5...Bad smelling gas.

Claims (1)

[Claims] 1 Using the reaction can of the sludge heat treatment equipment, the temperature is approximately 150°.
In a low-temperature pressurized sludge treatment method in which the sludge is heated to a temperature of about A method for removing malodorous gas in heat treatment of sludge, characterized in that the malodorous gas is removed in an ozone deodorizing tower and a deodorizing furnace, respectively, in response to a detection signal emitted from a device or the like.