JPH0358798B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is directed to a system that receives industrial waste containing various organic components and sludge in a dump truck or tank truck (including a vacuum truck) and then dumps it. The present invention relates to a method and apparatus for treating industrial waste that separates it into water, oil, and solids.

The present invention is suitable as industrial waste treatment equipment,
It is suitable for use as an industrial waste treatment facility installed on a small site.

〔overview〕

The present invention relates to an industrial waste processing method and apparatus for receiving and processing industrial waste containing a fluid component and solids that do not dissolve therein, and each apparatus for each processing step for processing industrial waste in stages. By arranging and connecting them in a rational manner, it is possible to continuously process different types of industrial waste into products that can be released or dumped.

[Conventional technology]

Various devices are known for processing industrial waste to meet standards that allow it to be discarded.

For example, activated sludge tanks that reduce biochemical oxygen demand (BOD) in domestic wastewater are widely known.

In addition, to separate solids that are mixed into wastewater and sludge and do not dissolve in these liquid components, there is an auto skimner that continuously removes solids by rotating a filter made of a belt-like combination of many chain-shaped blocks. (Manufactured by Toyo Filter Industries Co., Ltd., patent no.
1045349, 1046818, 1082717 and 1082679).

To remove suspended components including oil in wastewater,
When a polymer flocculant is added to wastewater, pressurized, and then released under atmospheric pressure, suspended components float to the surface in the form of flocs, so a pressurized flotation tank is known that scoops up the suspended components.

Furthermore, the sludge-like industrial waste is introduced into a screw drum whose screw pitch gradually becomes narrower, where it is rotated and heated, and the water is separated through a screen surrounding the drum. There is a screw press type dehydrator (manufactured by Fukoku Kogyo Co., Ltd.).

In addition, liquid waste is stored and this waste is
A PH adjustment device that monitors the PH value and neutralizes it is known.

[Problem that the invention seeks to solve]

It would be too expensive and require a large area for each business that generates industrial waste to individually install the above equipment. Personnel are also needed.

However, when these facilities are shared by a plurality of business establishments, there are many types of waste to be handled, and it is not possible to obtain a suitable product by simply combining the above-mentioned devices.

The present invention solves this drawback by accepting small amounts of waste containing different types of sludge, processing them continuously and rationally, and economically processing them with a small equipment area. Furthermore, it is an object of the present invention to provide a method and apparatus for processing industrial waste that has little impact on the surrounding environment.

[Means for solving problems]

The present invention provides a method for treating industrial waste containing water, organic components containing oil, and sludge, including:
Industrial waste transported by dump trucks or tank trucks (including vacuum trucks) is received in a receiving tank, and the fluid components that have passed through the filter means installed in this receiving tank are heated, stirred, and filtered to separate liquid components and solid components. This liquid component is separated into the above-mentioned oil content and water based on specific gravity, and this water is subjected to PH adjustment, further subjected to activated sludge treatment, and then discharged to the sewage to separate the components that do not pass through the above-mentioned filter means and the above-mentioned solid components. It is characterized in that the processing step of adding a chemical containing a solidifying agent and stirring and solidifying it to produce a solid material that can be disposed of in a landfill is continuously performed.

Furthermore, in a processing apparatus for industrial waste transported by a dump truck or a tank truck, a receiving tank is provided with a filter means, and a fluid component passing through the filter means is introduced, and a heating means using water vapor, a stirring means, a dehydration device including a filtration means; a neutralization tank for temporarily storing the liquid component separated by the dehydration device and observing its pH value while stirring; and adding a neutralizing agent according to the observation result; An oil-water separator that separates liquid components sent out from a neutralization tank into combustible oil and water based on specific gravity, an activated sludge tank that stores this water and performs activated sludge treatment, and water sent from this activated sludge tank. a solidification mixer for receiving the solid components sent out from the dehydration device and components that do not pass through the filter means, and including a kneading means and a solidification agent addition means; The apparatus is characterized by comprising means for transferring the solid matter to a storage tank.

The receiving tank includes a plurality of receiving tanks including a charging tank and a screen tank, the charging tank includes a perforated plate with a large number of holes as a filter means, and the filter element moves in a chain in the screen tank. It is preferable that an auto skimmer is included as a filter means, and that the input tank and the screen tank are each provided with a receiving entrance.

Each device and each means is distributed and arranged in a three-layer structure on the upper middle floor and lower floor, the receiving tank is arranged on the lower floor, the dehydration device is arranged on the upper floor, and the solidification mixer is arranged on the middle floor. The storage tank may be placed on the lower floor, and the activated sludge tank may be placed on the lower floor.

The oil-water separator preferably includes a stationary oil-water separator and a pressurized flotation cell that floats and separates suspended particles using pressurized air bubbles.

[Effect]

According to the method and apparatus of the present invention, a plurality of receiving tanks each having a suitable filter means and an inlet for receiving are provided, so that it is possible to appropriately receive various types of waste in small quantities. . The received waste is separated into similar types by filter means and other means, and each is treated as a batch. The waste discharged from each device is separated or combined for rational treatment. The final waste is processed to a state where it can be legally dumped.

〔Example〕

Next, an embodiment of the industrial waste treatment method according to the present invention will be described with reference to FIG.

FIG. 1 shows a system diagram of the processing method according to the above embodiment. In this figure, items surrounded by broken lines are related to waste treatment. Items circled with a circle indicate means of transportation for each intermediate product, etc. That is,
, indicate a basket crane, conveyor, and pump, respectively, and indicate natural fall due to gravity.

The waste received includes moisture, organic solvent components and sludge components.

This waste is received, and the water in a state that allows it to be discharged to the sewage outlet 6a, and the boiler 7a.
The waste is processed into combustible oil and solids that can be disposed of in a landfill and temporarily stored in the storage tank 9a.

The feature of the present invention is that the dump truck 10
0a or a tank truck (including a vacuum truck) 100b, the waste is transported by natural fall into the receiving tank 1 using a basket crane or a pump.
The waste is received in a tank via a filter means 1b, and fluid components in the waste are separated by this filter means 1b. The separated fluid component is subjected to PH adjustment treatment 2 in a raw water tank 2a to which a PH adjuster 2b is added, and then heated in a dehydrator 30 in a dehydrator 30, stirred, and filtered to separate solid components and liquid components. After separation, the liquid component is added to the neutralizing agent 3c in the neutralizing tank 3b for neutralization. Furthermore, in oil/water separation process 4,
The oil and water are separated into oil and water by the difference in specific gravity in the oil-water separation tank 4a and by the polymer flocculant 4c in the pressurized flotation tank 4b, and the flow rate of the water is adjusted in the adjustment tank 5a in the activated sludge treatment 5, and the activated sludge tank 5b The sewage effluent 6 is discharged from the effluent port 6a as having an allowable biochemical oxygen demand value.
On the other hand, the oil is accumulated in the waste oil tank 4d and subjected to oil incineration treatment 7 in the boiler 7a, and the generated steam 7b becomes energy for heating the dehydrator 3a. The solids separated in the receiving section 1 are transported by a bucket crane, and the solid components in the dewatering device 3 are transported by a conveyor, solidified by the solidifying agent 8b put into the solidifying mixer 8a of the solidifying process 8, and then allowed to fall naturally. Therefore, the waste is stored in a storage tank 9a and disposed of in a landfill 9. Further, in this processing method, the transfer of each intermediate product between each device is carried out automatically and continuously by a bucket crane, a conveyor, a pump, or gravity-driven gravity.

Next, an embodiment of the industrial waste treatment apparatus according to the present invention will be explained using the above-mentioned FIG. 1, FIG. 2 showing a detailed explanatory diagram of the receiving tank, and FIG. 3 showing a detailed explanatory diagram of the dehydration process. do.

The device of this embodiment includes a receiving tank 1 that receives waste that is brought in by a dump truck 100a and has a relatively high sludge content, and waste that is brought in by a tank truck 100b and has a relatively low sludge content; The waste oil tank 4d stores oil to be burned, and the discharge port 9b temporarily stores and carries out solid materials that are permitted to be disposed of in a landfill. Storage space 9a
It is equipped with

The features of the present invention are as follows.

The waste transported by the dump truck 100a is transported into the receiving tank 1 by gravity or by a bucket crane 101.
Input tanks 11 and 11' for receiving waste by the tank truck 100b and a screen tank 12 for receiving the waste transported by the tank truck 100b via a pump are provided in parallel. Here, the filter means is the input tank 11,1.
A perforated plate 11a provided with a large number of holes provided on the wall surface of 1', a perforated plate 11b provided on the top surface of the input tank 11', and a perforated plate 11b provided on the top surface of the screen tank 12 to scoop out solids from the waste. This is an auto skimmer 12a.

These filter means (11a, 11b, 1
The fluid component that has passed through step 2a) is treated as a lime solution 31a,
An overflow tank 31 to which ferric chloride 31b and a cationic agent 31c are added, and a first and second tank in which an anionic agent 32a is added and stirred when the cationic agent 31c is not added to the fluid component sent out from the overflow tank 31. and the boiler 7a.
A screw press type dehydrator 30 that passes water vapor through a passage hole 33a of a shaft 33 to be heated, stirred by a screw drum 34, and filtered by a screen frame 35 to separate solid components from liquid components. Equipped with a dehydration device including

A neutralization tank 3b is provided to temporarily store the liquid component separated by the dehydrator and add dilute sulfuric acid 3c as a neutralizing agent while stirring with a motor.

In order to separate the liquid component sent out from this neutralization tank into combustible oil and water, an oil-water separation tank 4a and a polymer flocculant 4c are added to perform pressurization and depressurization based on the difference in specific gravity. It is equipped with an oil-water separator including a known pressurized flotation tank 4b.

This oil-water separator includes an activated sludge tank 5b that performs activated sludge treatment 5 via an adjustment tank 5a that adjusts the flow rate of water separated.

A pump 6b is provided to guide the outlet of this activated sludge tank to a discharge port 6a.

A reception port 81 for receiving solid components discharged from the discharge port 37 of the dehydrator 30 and transferred by the screw conveyor 39 equipped with a monitoring port 38, and filter means (11b, 12a) for the input tank 11' and the screen tank 12, respectively. The solidification system is equipped with an input port 82 for transporting and charging the separated solids by a bucket crane 101, a stirring arm 85 rotated by a motor 84, and a solidification agent receiving port 83 for receiving the solidification agent 8b by a conveyor. A mixer 8a is provided.

A dust shooter 87 is provided to cause the solid material solidified by the solidification agent 8b discharged from the gate 86 of the solidification mixer 8a to naturally fall into the storage pot 9a.

Here, the feature of the present invention is that these components do not operate independently, but operate organically with each other to perform rational processing as a whole. This will be explained with reference to FIG. 4, which is a connection system diagram of each device of the apparatus of this embodiment.

In FIG. 4, the solid lines connecting each device indicate hoses or pipes, the broken lines indicate flexible hoses that are transparent and allow monitoring of the state of the contents, and the dashed-dotted lines indicate intake ducts from within each predetermined device. This air intake duct deodorizes the odor generated in each of these devices by sucking it into the deodorizing tower 102 using a blower 102a. Further, a solid line with the symbol C indicates a conveyor, P and M attached to each device indicate a pump and a stirring motor, respectively, and symbols CP and BL indicate a compressor and a blower, respectively.

Waste containing a large amount of sludge brought in by a dump truck is generally received in a charging tank 11, and waste containing a large amount of solids that do not dissolve in the sludge is received in a charging tank 11' having a perforated plate 11b provided on the upper surface.
Waste with a low sludge content carried by a tank truck is received by a pump through a transparent flexible hose into two screen tanks 12 each having an auto skimmer 12a on its upper surface. In this way, many types of waste can be accepted in parallel.

Further, the solids precipitated in the charging tanks 11, 11' are drained by the bucket crane 101 on the perforated plate 11b at the upper part of the charging tank 11', and the fluid components in the pump tank 11c that have passed through the porous agent 11a are pumped into the auto skimmer 12a. After the solid matter is removed, the solid matter is transferred to the screen tank 12. This is a series combination of two devices. The solid matter separated by this auto skimmer is stored in the scum tank 12b.

The fluid components in each screen tank 12 are transferred to the raw water tank 2a by a pump, and are transferred to the submersible mixer 22.
The pH is adjusted by adding sulfate 21a or caustic soda 21b while stirring. At this time, ferric chloride 31b is added if necessary, and the mixture is diluted with industrial water supplied from the water storage tank 103. The fluid components in this raw water tank 2a are pumped up and sent to two sets of dehydrators 30, respectively. There is an overflow tank 3 on the inlet side of the dehydrator 30.
1 is provided, and the fluid components introduced from the inlet 31d are mixed in the overflow tank 31 with a lime solution 31a, ferric chloride 31b, and a cationic agent 31.
c is added. If the flow sensor 31e shown in FIG. 3 detects that the water level in the tank has exceeded a predetermined value, the pump of the raw water tank 2a is stopped, and the transfer of the fluid component is temporarily stopped. At this time, the fluid component introduced in excess of the flow sensor 31e overflows from the discharge port 31f, and the screen tank 12
is returned onto the auto skimmer 12a. In the overflow tank 31, the fluid component to which the drug has been added is sent to the first reaction tank 32 by gravity and is stirred. When the cationic agent 31c is not added to this fluid component in the overflow tank 31, the anionic agent 32a is added to the second reaction tank 3.
Stir further at 2'. The purpose of adding these chemicals is to obtain appropriately aggregated solid components in the dehydrator 30. Here, the anionic agent or cationic agent is selected by observing the agglomeration state of the solid components transferred through the monitoring port 38 provided in the screw conveyor 39 discharged from the discharge port 37 of the dehydrator 30. be exposed.

The liquid component separated by the dehydrator 30 is transferred to the neutralization tank 3
After being neutralized in step b, the oil is separated in an oil-water separation tank 4a into a skim component containing oil, water, and sludge based on the difference in specific gravity. This sludge is returned to the raw water tank 2 by a pump, and the oil skimmer 4
The skim-like components scraped off in step 1 are sent to the waste oil tank 4d by a pump.

Since the water sent out from the oil-water separation tank 4a contains easily suspended components such as oil, it is thoroughly stirred in the reaction tank 42, and then pressurized by the compressor 43 to add a polymer flocculant 4c to the water containing air bubbles.
is added and floated under reduced pressure from the bottom of the pressurized flotation tank 4b, the easily suspended components are separated as a floc-like solid by the polymer flocculant 4c, and since this contains oil, it is floated into the waste oil tank 4d. sent to. On the other hand, the components of water that settle in the treatment tank 44 are subjected to pressure flotation treatment again, and the supernatant water is sent to the adjustment tank 5a by the pump tank 45. Adjustment tank 5
The next activated sludge tank 5b is used to temporarily adjust and store the water in order to perform activated sludge treatment at a rate depending on the organic components of the waste, and the flow box 51 adjusts the flow rate, that is, the flow rate of water. The blower 52 generates air bubbles in the activated sludge tank 5b to perform a so-called degassing process. The return box 53 is for returning the sludge floating on the outlet side to the inlet side. The water that has passed through the activated sludge tank 5b is pumped up in the discharge tank 54 and discharged into the sewer from the discharge port 6, and the water in the waste is treated.

The oil stored in the waste oil tank 4d is sent to the boiler 7a, mixed with the fuel in the fuel tank 104, and is burned and processed by a burner (not shown).

On the other hand, the solids separated by the perforated plate 11b of the charging tank 11', the solid components separated by the dehydrator 30, and the solids stored in the scum tank 12b are solids that can be disposed of in a landfill by the solidification mixer 8a as described above. The intermediate processing is completed by storing it in the storage tank 9a as a material.

As explained above, according to the present invention, each device:
The movement or conveyance of each intermediate product and final product is performed automatically and continuously, such as by pumps, conveyors, bucket cranes, or by gravity gravity, respectively.

As shown in FIG. 4, each of these devices is distributed and arranged on three floors of one building: the basement, first floor, and second floor. In other words, input tank 1 which is a receiving tank
1, 11' and the screen tank 12 are located in the basement.
It is easy to carry in by dump truck or tank truck that arrives at the ground floor.

Dehydrator 30 and its attached equipment (31, 32,
32', 3b, etc.) are installed on the second floor, which is the top floor.
The water is transferred to this device by a pump in the raw water tank 2a. The waste from the dehydrator 30 is sequentially dropped using gravity and is subjected to subsequent processing. That is, the separated solid components are transferred to a solidification mixer 8 installed on the first floor, which is the middle floor.
Enter a. The separated liquid component is dropped into the basement and supplied to the oil/water separation tank 4a.

Additionally, a heavy activated sludge tank 5b and a storage tank 9a for discharge are installed in the basement. Only a few of these transfers cannot utilize gravity, and this is accomplished by bucket crane 101.

Regarding the apparatus according to the embodiment of the present invention as described above, it has been proven by measurement that the final waste can be discharged into sewage and can be disposed of in a landfill. This certification shall be submitted in the form of an attached test certificate.

〔Effect of the invention〕

As explained above, according to the present invention, moisture,
It is possible to process industrial waste containing organic components and sludge into dumpable water, solids and combustible oil without affecting the surrounding environment.
It is effective because it can be carried out on a small site. The present invention does not simply combine each device, but instead accepts small amounts of many types of waste in parallel, separates and classifies them, and makes it possible to perform continuous processing in an economical manner. It is something. The final effluent according to the invention is legal.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an embodiment of the industrial waste treatment method of the present invention. FIG. 2 is a detailed explanatory diagram of the receiving tank of the above embodiment. FIG. 3 is a detailed explanatory diagram of the dehydration device. FIG. 4 is a continuous system diagram of each device in the embodiment of the industrial waste treatment device of the present invention. 1... Receiving tank, 2... PH adjustment processing, 2a... Raw water tank, 2b... PH adjusting agent (21a... sulfuric acid band, 21b... caustic soda), 3... Dehydration device,
3b...neutralization tank, 3c...dilute sulfuric acid as a neutralizing agent,
4...Oil/water separation treatment, 4a...Oil/water separation tank, 4b
...Pressure flotation tank, 4c...Polymer flocculant, 4d...
...Waste oil tank, 5...Activated sludge treatment, 5a...Adjustment tank, 5b...Activated sludge tank, 6...Sewage discharge, 6a
...Discharge port, 6b...Pump, 7...Oil incineration treatment, 7a...Boiler, 7b...Steam, 8...Solidification treatment, 8a...Solidification mixer, 8b...Solidification agent,
9...Landfill dumping, 9a...Storage waste, 9b...Solid material export port, 11, 11'...Input tank, 11a,
11b... Porous plate, 11c, 45... Pump tank,
12...Screen tank, 12a...Auto skimmer, 12b...Scum tank, 21a...Sulfuric acid band, 21b...Caustic soda, 22...Underwater mixer, 30...Dehydrator, 31...Overflow tank, 31a...Lime Solution, 31b... ferric chloride, 31c... cationic agent, 31d... inlet,
31e...flow sensor, 31f...discharge port, 3
2,32'...Reaction tank, 32a...Anionic agent,
33...shaft, 33a...passing hole, 34...
Screw drum, 35...Screen frame, 36
... Tray, 37 ... Dehydrator outlet, 38 ...
Surveillance port, 39... Screw conveyor, 41...
Oil skimmer, 42...Reaction tank of pressurized flotation tank, 4
3... Compressor, 44... Processing tank, 51
...Flow box, 52, 102a...Blower, 53...
...Sludge return box, 54...Discharge tank, 81...Intake port, 82...Input port, 83...Solid agent reception port, 8
4...Motor, 85...Stirring arm, 86...Gate, 87...Dust shooter, 100a...Dump truck, 100b...Tank truck, 101...
Bucket crane, 102...Deodorization tower, 102a
... Blower, 103 ... Water tank, 104 ... Fuel tank.

Claims (1)

[Scope of Claims] 1. Receives industrial waste including water, organic components containing oil, and sludge, and collects water in a state that allows it to be discharged into sewage, oil that can be treated by combustion, and waste that cannot be disposed of in a landfill. In this method, industrial waste transported by a dump truck or tank truck is received in a receiving tank, and the fluid components that have passed through a filter provided in the receiving tank are heated, stirred, and filtered. This liquid component is separated into a liquid component and a solid component, and this liquid component is separated into the oil component and water based on specific gravity, and this water is subjected to PH adjustment, further subjected to activated sludge treatment, and then discharged to sewage, and the filter means is passed through the filter means. Industrial waste treatment characterized by continuously performing the treatment process of adding a chemical containing a solidifying agent to the components that do not pass through and the solid components, stirring and solidifying them to make the solids that can be disposed of in a landfill. Method. 2. A receiving tank that receives industrial waste transported by dump truck or tank truck, a discharge port that discharges water in a state that allows it to be discharged into the sewer, a tank that stores oil to be burned, and landfill disposal. In an industrial waste processing apparatus, the receiving tank is provided with a filter means, and the fluid components passing through the filter means are A dehydration device is installed, which includes a heating means using water vapor, a stirring means, and a filtration means, and the liquid component separated by this dehydration device is temporarily stored and its PH value is observed while stirring. Therefore, there is a neutralization tank to which a neutralizing agent is added, an oil-water separator that separates the liquid components sent from the neutralization tank into combustible oil and water based on specific gravity, and a water separator that stores this water to create activated sludge. an activated sludge tank to be treated; a means for guiding water discharged from the activated sludge tank to the outlet; a kneading means and a solidifying agent for receiving solid components sent from the dewatering device and components that do not pass through the filter means; An industrial waste processing device comprising: a solidification mixer including an addition means; and a means for transferring solids discharged from the solidification mixer to a storage tank. 3. The receiving tank includes a plurality of receiving tanks including a charging tank and a screen tank, the charging tank includes a perforated plate with a large number of holes as a filter means, and the filter element moves in a chain in the screen tank. 3. The industrial waste processing apparatus according to claim 2, wherein the input tank and the screen tank are each provided with a receiving entrance. 4 Each device and each means is distributed and arranged in a three-layer structure on the upper middle floor and lower floor, the receiving tank is arranged on the lower floor, the dewatering device is arranged on the upper floor, and the solidification mixer is arranged on the middle floor. The industrial waste treatment apparatus according to claim 2, wherein: the storage tank is arranged on the lower floor, and the activated sludge tank is arranged on the lower floor. 5. The industrial waste treatment apparatus according to claim 2, wherein the oil-water separator includes a stationary oil-water separator tank and a pressurized flotation tank that floats and separates suspended particles using pressurized air bubbles. .