JPH08309333A - Wastewater treatment method in industrial waste treatment facility and industrial waste treatment facility - Google Patents

Abstract

PURPOSE: To completely prevent wastewater from flowing outside a facility by a method in which a wastewater channel or a wastewater tank for storing wastewater is installed inside the bottom part of a water impermeable material, wastewater extracted from the channel or the tank is mixed with quick lime and cement to cause evaporation and coagulation. CONSTITUTION: An industrial waste treatment facility 1 is constituted by covering the periphery 21 and bottom part 22 of a dumping site 2 with a water impermeable material 3. A wastewater channel 5 for storing wastewater 4 is formed inside the bottom part of the material 3. A submersible pump 9 is installed in the water collection part of the channel 5, and the wastewater 4 is extracted upward by a wastewater extraction hose 10 which is connected with the channel 5. Waste 13 is placed in the bottom part and covered with intermediate covering earth 14. Besides, when the channel 5 is filled with the wastewater 4, it is extracted above the earth 14 by the pump 9. The wastewater 4 is mixed with quick lime 15 in a mixing tank 12 to evaporate and remove water. The obtained hydrated lime 16 is used, for example, for landfill as waste.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial waste treatment facility and a method for treating sewage or leachate in an industrial waste treatment facility, wherein the pumped sewage or leachate is evaporated or condensed by heating or a chemical reaction. And then consume and process. The present invention also relates to a method in which quick lime is recovered by reversely digesting slaked lime generated by the reaction by heating.

[0002]

2. Description of the Related Art Industrial wastes are increasing nationwide as a result of active industrial activities, but the final disposal is done by landfill. However, recently, the sewage generated from waste and the rainwater that has poured into the waste flow down harmful substances in the waste, and there is a great deal of opposition from the surrounding residents, making it extremely difficult to newly build an industrial waste treatment facility (landfill disposal site). Is becoming.

[0003]

Therefore, in a management type disposal site (objects other than stable 5 items are targeted) or a block type disposal site (objects containing harmful substances are targeted), sewage and rainwater are purified on site. Heading in the direction. However, the purification treatment requires space, time and labor, and its maintenance cost is considerable. Moreover, it is impossible to completely purify,
There is a risk that the leachate from the damaged part of the disposal site will be mixed with the groundwater and flow down as it is. Further, even in stable disposal sites for so-called stable 5 items such as construction waste materials and plastic waste materials, recently, allergies to discharged water are large, and the same problem occurs.

[0004]

The inventors of the present invention have completed the present invention as a result of diligent research. The feature of the present invention is that wastewater discharged from an industrial waste treatment facility is treated with quicklime or cement. It is about to be mixed with and evaporated or consumed. Alternatively, the waste oil or the waste tire is evaporated as a heat source, and the excess waste water is mixed with quicklime or cement to be evaporated or consumed. The slaked lime produced as a result of the reaction is back-digested using waste oil, waste tires, etc. as a heat source to recover quick lime, which is repeatedly used. As a result, a single drop of sewage does not flow out of the site, and if the obtained slaked lime, cement paste or mortar is placed around the treatment facility, it also functions as an impermeable material. It can also be used as a repair material for impermeable materials. Gypsum can be obtained by adding a small amount of sulfuric acid to lime and sewage or leachate, and sealing of harmful substances and impermeability can be further improved.

Further, according to the present invention, when a part of the impermeable material constituting the industrial waste treatment facility is damaged, the leachate from the damaged part is collected and treated in the same manner. Further, in the present invention, the entire device or a part thereof is covered with a roof to prevent or reduce the inflow of rainwater and prevent an increase in dirty water.

The method of the present invention will be described below. In the present invention, the industrial waste treatment facility is a landfill type facility in which holes and valleys formed in a flat land are used and the periphery and bottom are covered with an impermeable material. Then, a sewage groove or a sewage tank for collecting sewage is installed inside the bottom of the impermeable material. As the impermeable material, a rubber sheet or a plastic sheet is preferable from the viewpoint of construction convenience and cost,
Of course, it is not limited to this, and may be made of concrete or the like. Further, slaked lime or gypsum obtained by carrying out the present invention, or cement paste or mortar can also be used as the impermeable material itself or an auxiliary material (reinforcing material) thereof. Slaked lime or gypsum may use the product. When used as an auxiliary material, it is applied from above the sheet, but it is particularly useful for reinforcing the seam portion of the sheet. The joint and seam are made of epoxy resin or polyester resin and glass fiber, and if they are reinforced by FRP applied on site, the strength and waterproof property are further improved.

First, the method for installing the industrial waste treatment facility is as follows.
After selecting an appropriate size of the valley or making a hole in the flat ground, the bottom and its vicinity are covered with an impermeable material. The sewage ditch and sewage tank are constructed by providing a groove and a small hole in advance at the relevant location on the bottom. The groove or the small hole is preferably provided in the lower portion of the tapered bottom portion. The number of grooves and the number of small holes are appropriately determined according to the area and shape of the industrial waste treatment facility. The sewage ditch and sewage tank should be covered with gravel, use a perforated plastic pipe, or fill a basket to prevent it from being filled with waste. Waste is thrown in in this state, and when it reaches a certain thickness, the intermediate soil is covered. A water collecting sheet or a gravel layer may be laid inside the bottom portion to smoothly collect water.

Before and after this, if water is accumulated in the low part of the sewage groove or in the sewage tank, it is drawn out through the sewage drawing pipe and mixed with quicklime and cement. Most preferably, a submersible pump is used for this pumping. It is convenient for the submersible pump to be of a type that automatically detects when sewage has accumulated in the sewage channel. Alternatively, when the sensor is turned on and the dirty water is accumulated, the lamp on the ground may be turned on and the pump may be manually operated. It is convenient to handle the drainage pipe by adding it in relation to the intermediate soil cover. When sewage is mixed with quick lime, reaction heat is generated by the following reaction and becomes slaked lime after 20 to 30 minutes (digestion). H ₂ O + CaO → Ca (OH) ₂ + 15,500 c
al / mol Further, the heat of reaction reaches 100 to 300 ° C., and a large amount of water is evaporated in addition to the amount required for the reaction. Slaked lime embraces harmful metals in wastewater and solidifies. Sewage may be mixed with cement to form cement paste or mortar, which may be consumed as condensation water. Also, when using slaked lime,
When sulfuric acid is added at a constant ratio, gypsum (CaSo ₄ ) is obtained, and sealing of harmful substances and odors and water impermeability are further improved. The obtained slaked lime, gypsum and cement paste (mortar with sand added) are effectively used as an impermeable material. In this case, it is used on the side surface in the middle of landfill or for repairing damaged parts.

Alternatively, sewage or leachate may be directly heated and evaporated. It is also possible to evaporate only a part of the water, and only water containing the remaining pollutants may be reacted with the quicklime or cement and consumed. The use of waste oil and tires as a heat source promotes effective use of further waste. In addition, slaked lime produced as a result of the digestion reaction of quick lime can be heated by utilizing the combustion heat of waste oil or waste tire, and can be reversely digested to recover quick lime. If the recovered quicklime is reused for the reaction, the quicklime consumption can be reduced.

The sewage is water that leaks from wastes, water in the air is condensed, and the like, but the largest quantity is due to rainwater. Therefore, if you cover the whole device or part of it with a roof to prevent rainwater from entering,
Wastewater to be treated is greatly reduced. The roof may have any structure, but since it is large, it is preferably as light as possible, for example, sheet covering. It is recommended to keep it openable for convenient disposal. Further, since the landfill is sequentially performed from the bottom, the roof itself may be sequentially lifted or the upper surface of the industrial waste treatment facility may be covered from the beginning. In either case, the rainwater is guided to the drains, etc. provided around the facility.

Next, the treatment of the leachate will be described. In the industrial waste treatment facility of the present invention, the bottom and the periphery thereof are lined with an impermeable material, but there is a possibility that sewage will seep out of the facility, especially below it, from the damaged parts and joints. Therefore, the bottom of the bottom is further covered with a water-impermeable protective material, and a leachate groove or a leachate tank for storing leachate is provided inside the protective material. Then, the leachate extracted from the tank is mixed with quicklime or cement in the same manner as the sewage and treated. As the impermeable protective material, a plastic sheet or concrete is used as described above. If the position where the impermeable protection material is installed is lower than the groundwater level, groundwater accumulates in that part, so it is necessary to position the bottom of the facility or the impermeable protection material at a position higher than the groundwater position.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on the embodiments shown in the drawings. FIG. 1 is a sectional view showing an example of an industrial waste treatment facility 1 according to the present invention.
This facility 1 is constructed by covering a surrounding area 21 and a bottom portion 22 of a landfill 2 made of a hole dug in a valley or a flat land with an impermeable material 3 made of a plastic sheet.
Initially, only the lower part of the periphery 21 may be covered with the impermeable material 3. Further, a sewage groove 5 for storing sewage 4 is provided inside the bottom of the impermeable material 3.

It is advisable to lower the groove 5 in the central portion of the device 1 so that the dirty water is collected and extracted there. You may provide a dirty water tank in this part. The groove 5 may not be provided, and only the dirty water tank may be provided. The number and arrangement of the grooves 5 and sewage tank are
It is determined appropriately according to the shape and size of the entire device. In order to prevent clogging, the groove 5 and the dirty water tank may be filled with gravel 6 and covered with a net 7 made of plastic or stainless steel. By arranging the water collecting sheet 8 on the bottom portion 22, water can be collected more smoothly. An underwater pump 9 is installed in the water collecting portion of the dirty water groove 5, and the dirty water is drawn upward by a dirty water drawing hose 10 connected to this. It is convenient to clean the submersible pump 9 if the submersible pump 9 and the sewage drain hose 10 are stored in the sewage drain pipe 11 so that they can be freely taken out and put in. The submersible pump 9 may detect that a certain amount of the dirty water 4 has accumulated in the dirty water groove 5 and automatically drain the dirty water. The sewage drainage pipe 11 is added so that it becomes longer as the landfill progresses. Sewage drain hose 1
The leading end of 0 is guided to the mixing tank 12 installed at an appropriate location.

In using the industrial waste treatment facility 1 of the present invention, the waste 13 is initially dumped at the bottom of the apparatus, and when a certain amount is collected, the intermediate soil 14 is covered on it. Then, the same operation is repeated, and when the device is full, the final soil is covered and the use of the device is stopped. On the other hand, when the sewage 4 or the sewage tank accumulates the sewage 4 after a certain period of time (before the provision of the intermediate cover soil 6), the submersible pump 9 pulls it out above the intermediate cover soil 14. The drained sewage 4 is mixed with quicklime 15 in the mixing tank 12 to evaporate and remove water. The obtained slaked lime 16 may be landfilled as waste as it is, or may be applied to the surroundings as an impermeable material. When sulfuric acid is added to lime, gypsum is obtained and it becomes a stronger and impermeable material. Cement may be used instead of or in addition to quicklime.

A management road 17 and a surface water drainage groove 18 are provided around the upper end of the landfill 2 shown in the figure. In addition, the roof 19 is a sheet 3
1 and its end is located above the surface water drainage groove 18. By doing this, the management cost can be reduced because rainwater does not become dirty water.

Next, FIG. 2 shows another example of the industrial waste treatment facility which also treats the leachate 32 in the same manner without emission. In this facility 33, in addition to that shown in FIG.
Is installed. Then, a leachate groove 35 is installed in the vicinity of the central portion thereof, and the leachate 32 is drawn into the mixing tank 12 through the submersible pump 36 and the leachate drawing hose 37 as in the case of dirty water. Reference numeral 38 is a leachate drawing pipe. In this case, in particular, it is necessary that the installation position of the impermeable protection material 34 as well as the bottom portion 22 is higher than the groundwater level UL. The leachate 32 that collects inside the impermeable protective material leaks from breaks or joints in the impermeable material and should not be originally collected. Therefore, it is convenient for the submersible pump 36 to be of a type that detects water and operates automatically.

The treatment of the obtained slaked lime or the like is the same as in the case of FIG. With such a structure, even if sewage leaks due to damage to the impermeable material, the sewage can be completely recovered and does not flow out to the downstream region, which is extremely safe.

As for the treatment of slaked lime, in addition to discarding or using it as the water impermeable material 3, the obtained slaked lime 16 is fired and decomposed in a combustion furnace 40 (rotary kiln) as shown in FIG. You may make it lead to 41 and carry out back digestion, and collect quicklime 15. Quicklime 1 recovered
When 5 is recycled and reacted with sewage again, the consumption of quick lime is reduced and the cost is reduced. Slaked lime is 44
Decomposes (back digests) at 5 ° C. The heat of decomposition is 15,500.
cal / mol. In the figure, reference numeral 42 is a chimney, G is a combustion gas, and EG is a waste gas. It should be noted that when waste materials such as waste tires and waste oil are used as the fuel, it is possible to obtain a certain amount, but it is not limited thereto. Or sewage and leachate,
You may make it evaporate by heating directly, without making it react with quicklime, etc., and after making it heat-evaporate a part and reduce volume, you may make it react with quicklime etc.

[0019]

As described above in detail, according to the method of the present invention, in a landfill type industrial waste treatment facility in which the periphery and the bottom are covered with an impermeable material, the wastewater accumulated at the bottom and further the bottom and the periphery are collected. The leachate that leaks out is extracted and mixed with quick lime and cement. Therefore, there are advantages as described below. 1) Sewage is not discharged as it is because it reacts with quicklime to evaporate or reacts with cement to form condensed water. 2) The product (slaked lime, gypsum, cement mill, mortar) obtained as a result of the reaction can be used as a water-impermeable material as it is, and if it is not necessary, it can be disposed of as a waste as it is. There is an advantage that less material is needed. 3) The product is safe because it holds the harmful substances in the wastewater and blocks the outflow, and is also effective in preventing the generation of bad odors. This effect is particularly remarkable with gypsum. 4) When slaked lime is inversely nitrified by heating to recover quick lime, it can be recycled any number of times, so the running cost is reduced. 5) When a roof is installed, rainwater is discharged to the outside of the system, so the amount of sewage treated is greatly reduced. 6) When an impermeable protective material that collects leachate is provided below the bottom of the facility, it is possible to effectively prevent the outflow of sewage leached from the joint or the damaged part of the impermeable material. The discharge of sewage can be completely prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of an industrial waste treatment facility related to the method of the present invention.

FIG. 2 is a vertical cross-sectional view showing another example of the industrial waste treatment facility related to the method of the present invention.

FIG. 3 is a schematic vertical sectional view showing an example of a sewage treatment apparatus related to the method of the present invention.

[Explanation of symbols]

1 Industrial waste treatment facility 32 Leachate 3 Impermeable material 33 Industrial waste treatment facility 4 Sewage 34 Impermeable protective material 5 Sewage ditch 35 Leachate ditch 15 Quick lime 40 Combustion furnace 16 Slaked lime 41 Firing decomposition furnace 19 Roof

Claims (10)

[Claims] 1. A landfill type industrial waste treatment facility in which the periphery and bottom are covered with an impermeable material, and a sewage groove or a sewage tank for accumulating sewage is installed inside the bottom of the impermeable material. Alternatively, a method for treating sewage in an industrial waste treatment facility, characterized by mixing sewage drawn from a tank with quick lime or cement to evaporate or condense. 2. The bottom part is arranged at a position higher than the groundwater level, and the leachate leaching from the damaged part of the impermeable material covering the surroundings and the bottom part is located below the bottom part and at a position higher than the groundwater level. Cover with the impermeable protective material provided and install a leachate groove or leachate tank to store leachate inside the protector, and mix leachate extracted from the groove or tank with quicklime or cement to evaporate or set The method for treating sewage in an industrial waste treatment facility according to claim 1, wherein the method is used. 3. The method for treating sewage in an industrial waste treatment facility according to claim 1 or 2, wherein sulfuric acid is added when quicklime and sewage or leachate are mixed. 4. The method according to claim 1, wherein a mixture of sewage or leachate and lime, cement or the like is used as a part of the impermeable material or for repairing a damaged portion thereof.
Alternatively, the method for treating wastewater in the industrial waste treatment facility according to claim 3. 5. The industrial waste according to claim 1, wherein quick lime is recovered by reacting quick lime with sewage or leachate to make slaked lime, and then heating and digesting the slaked lime to recover quick lime. Treatment method of sewage in the treatment facility. 6. In a landfill type industrial waste treatment facility in which the periphery and bottom are covered with an impermeable material, a sewage groove or a sewage tank for collecting sewage is installed inside the bottom of the impermeable material, and the groove is provided. Alternatively, a method for treating wastewater in an industrial waste treatment facility, characterized by heating and evaporating the wastewater drawn from the tank. 7. The bottom part is arranged at a position higher than the groundwater level, and the leachate leaching from the damaged part of the impermeable material covering the surroundings and the bottom part is located below the bottom part and higher than the groundwater level. 7. A leachate groove or a leachate tank for accommodating leachate is provided on the inside of the protector covered with the impermeable protective material, and the leachate extracted from the groove or tank is heated and evaporated. Wastewater treatment method in the described industrial waste treatment facility. 8. The method for treating wastewater in an industrial waste treatment facility according to claim 6 or 7, wherein the residual wastewater or leachate that has been heated and evaporated is mixed with quicklime or cement to evaporate or condense. . 9. A landfill is constructed by covering the surrounding area and bottom with an impermeable material, and a drainage groove or a wastewater tank for storing wastewater is installed inside the bottom, and below the bottom and below the groundwater level position. An industrial waste treatment facility, characterized in that a water-impermeable protection material is installed at a high place, and a leachate groove or a leachate tank for accumulating leachate is installed inside the water-impermeable protection material. 10. The industrial waste treatment facility according to claim 9, which covers a part or all of the industrial waste treatment facility with a roof.