JP2010075816A - Infiltration purification method for contaminated soil and deep underground inorganization treatment method for contamination - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of making the diffusion prevention of contaminated soil by a permeable pipe and cleaning possible for the principle of the natural circulation and cleaning harmful substances by injecting water to the deep underground by a high pressure pipe, while the stabilization principle of the substances of the natural circulation observed in a hot spring for which rain water on a mountain peak is made harmless deep underground through the long period of the unit of several thousands years is optimum as a means to be applied to the detoxification treatment of active harmful substances created by human beings for global environment maintenance, and a method of efficiently extracting contamination from the contaminated soil and injecting water to the deep underground while the natural circulation can detoxify organic substances when the cycle of a long period is considered. <P>SOLUTION: In the cleaning method of the contaminated soil, since water is a medium, a stream of ground water is artificially formed, and harmful substance is extracted by the infiltration of water in a permeable pipe. Flocculation and concentration are executed using a chemical agent for the purpose of improving efficiency as needed, the water is injected into deep underground using a high pressure water injection pipe to clean earth contamination, and the detoxification is executed utilizing the natural circulation principle of the deep underground. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an environmental technology aimed at purification using a natural circulation function of contaminated soil for the preservation of the global environment.

  The conventional purification method of environmental pollutants is a positive physical purification method (mineralization) with high energy by extracting harmful substances and generally firing at high temperature. This drawback requires more resources and energy to improve the environment, and its cost of implementation and additional environmental pollutants to produce the required energy are generated. The present invention has focused on hot springs and the like that generate water formed by the decomposition of many harmful substances into safe minerals after a long period of 1000 years when rain water falling on the mountain peak penetrates the formation. In the process of deep water generation, harmful heavy metals and sulfides, which are active chemical substances, pass through mineral formations, etc., and dissolved harmful contaminated water is rendered harmless over a long period of time under high temperature and high pressure (stabilization). ) Produced into mineral components. The basis of the present invention utilizes this natural circulation generation process. The basic means is to artificially inject harmful substances on the ground into the deep underground to obtain the law of natural decomposition. In general, short-term chemical products produced by humans are highly active for organisms, unlike products that have been used for a long time. This can be considered a harmful substance, and in order to be suitable for the living environment of living organisms, a substance that has undergone a long-term natural circulation of 1000 years is an environment improvement. The application of this law is based on the existence of the generation principle in the geological formation with hot springs, and the high-temperature and high-pressure stability of the material, which took thousands of years to inject the contaminants into the deep underground and exude to the surface. Apply the natural circulation law of detoxification (detoxification). Fortunately, Japan has hot springs throughout the country, and this principle can be applied to the whole country.

  Natural circulation purification of soil contamination of environmental pollutants is a law of detoxification of organic matter by deep underground for a long time at high temperature and high pressure, considering the cycle. Since these use water as a medium, the basic technology for applying the law is to develop methods and means for preventing the diffusion of contaminated soil, cleaning harmful substances with infiltrated water, and transporting contaminated water to the deep underground. It is.

  This paper describes the methods and means that have succeeded in developing the technology for the purification of contaminated soil using the law of natural circulation. In this basic technology, all harmful chemical substances generated by humans in a short period of time are dispersed and dissolved in water. It is important not to disperse harmful substances that are not suitable for the biological environment, and for this purpose, storage in the ground underground is the best initial measure and has been implemented since the past. However, harmful substances dissolve in water, disperse and ooze out to the surface, diffuse from the groundwater flow, and affect living organisms.

Therefore, it is first necessary to prevent the diffusion of the contamination shown in the explanatory diagram of FIG. Set all the contaminated areas or the necessary decontaminated areas. Next, a glass fiber reinforced plastic or stainless steel water permeable tube, which can be expected to have corrosion resistance, is placed vertically at equal intervals covering the target area like a well above the contamination depth. Water is poured or drained from this well to control the flow of groundwater and isolate the contaminated area. Next, a well with a similar permeation pipe is placed in the pollution source, and the soil is washed by draining or pouring water. If necessary, mix with water such as adsorbent. Collected drainage of soil permeated water is injected into the underground layer below 700 meters under high pressure into the deep underground where thousands of years of hazardous substances can be retained and stabilized.

If necessary, drain pump piping is put into a water storage tank, the tank is depressurized to extract organic harmful gases, and incinerated in a high-temperature combustion pipe. Contaminated water is concentrated in the contaminated water via an adsorbent / flocculant and ion adsorption membrane, and high-pressure water is injected into the deep underground. In other words, a system that cleans and injects pollutants into the deep underground with osmotic water in a non-decomposed state without high-temperature amortization or chemical decomposition, and makes the harmful substances harmless by the law of natural circulation over a long period of time.

The effect of the present invention is to detoxify harmful chemical substances such as heavy metals in deep groundwater (mineralize into a stable mineral component) with a circulation cycle of 1000 to 10,000 years, which is the law of natural circulation. Prevents the diffusion of harmful substances with a permeation pipe, applies high pressure injection of extracted contaminated water into the deep underground, and applies the laws of natural circulation to decontaminate and detoxify soil harmful substances. Using this method, compared to conventional methods such as removal and active decomposition (heat treatment) of contaminated soil, there is no need to move contaminated soil, and the micro-energy (windmills and solar cells) that creates groundwater flow in the current state Can be decontaminated and mineralized only with natural energy), which greatly reduces costs and eliminates secondary pollution problems. In addition, construction can be performed easily in the current state, completed in a short period of time, and a safe environment necessary for human beings can be provided. Contaminated contaminants can be safely purified naturally over several decades.

In addition, there are two effects: decontamination effect and detoxification effect of decontamination product. Each of them can exert its effect.

  The permeation pipes installed in the perimeter and the decontamination area shown in Fig. 1 for preventing diffusion of the soil-contaminated area must have innumerable permeation holes, resistant to external pressure, and free from soil clogging. For this permeable tube, concrete and the like are not suitable due to strength and eyes, and it is difficult and expensive to perforate stainless steel. Centrifugal tube made by pulverizing FRP waste material with polyester resin, etc. is not only necessary to solve this problem as a permeable tube of recycled material, but also to withstand corrosion and to be used for a long time. Since strength is also obtained, a water permeation pipe made of FRP waste is optimal for the water injection pipe and water permeation pipe.

  For the high-pressure water injection pipe to the deep underground, an API specification pipe used for oil production in the deep underground is suitable. Among them, in order to require long-term use and corrosion performance, FRP centrifugal molded high-pressure pipes using a metal material resistant to corrosion such as stainless SUS316 material or vinyl ester resin are used. In particular, a high-pressure FRP pipe made by centrifugal molding has a pressure resistance of 28 megapascals or more, has a durability of 40 years, is the lowest in cost, and is optimal as a water injection pipe.

The water used for water is washed with seawater and injected into the deep underground under high pressure, and pollutants using groundwater and rainwater are collected from the wastewater, and are chemicals that are industrial waste (for example, sodium sulfide: NaSH). A method using natural water in which heavy metal dissolved in the contaminated water is condensed and precipitated and concentrated, and the supernatant is poured again is adopted.

When it is necessary to improve the separation accuracy of contaminants, adsorption separation of molten heavy metal by an ion exchange resin membrane is employed. Contaminants are removed by washing the heavy metal adhering to the membrane with hydrochloric acid or the like to separate it when regenerating the membrane, thereby concentrating the contaminants. Making concentrated contaminated water can reduce the amount of water injected into the deep underground.

The groundwater energy to be washed by permeation due to soil contamination is water injection and drainage from the permeation pipe, and necessary permeation purification can be obtained by maintaining the difference between the groundwater head and the contamination boundary and the contaminated area generally from about 50 mm to 100 mm. The energy required for this is small. The energy for making concentrated washing water is the same. The largest energy requirement is high-pressure water injection. Concentrated washing water reduces the amount of deep underground water injection energy, and the required energy can be adequately provided by wind turbines and solar power generation alone or in combination. In addition, since the necessary washing water can be sufficiently provided by rain water or the like, the contaminated soil can be purified over several decades without requiring artificial energy.

The content of the invention which solved the effective attachment of a permeable pipe and the attachment problem of the required high-pressure water injection well to the deep underground will be described.

In FIG. 1, the left side is a plane of contaminated soil, and the right side is an AA cross section thereof. Assume that there is a priority area or a divisional decontamination area to be decontaminated. This area is the decontamination area shown in FIG. In the area intended for decontamination, a permeation pipe will be installed vertically on the boundary line so as not to spread the contamination. A permeation pipe is also attached to the contaminated part. Install the necessary number of deep underground high-pressure injection pipes in the appropriate contaminated area.

The water head indicated by the two-dot chain line in the groundwater shown in FIG. 1AA is the boundary water injection-contaminated area drainage, and the contaminated area is lowered. In other words, contaminated water flows in one direction in the basement by water injection and drainage to decontaminate. If drainage is poured into the deep underground, the pollutants in the decontamination area move to the deep underground with time.

The same applies to the case where the decontamination area is the entire contaminated area, and the implementation effect is the same even if the necessary decontamination areas are distinguished. In other words, it is a good idea to decontaminate in accordance with the amount of contamination. The optimal decontamination method can be designed by controlling the flow rate of groundwater by the number of permeable pipes and the water injection pressure (water head height) and drainage pressure (water head height).

The content of the invention which solved the high-pressure water injection problem to the stable underground layer where the pollutants are rendered harmless will be described.

The geological section shown in Fig. 2 is detoxified by water injection pipes and drainage pipes laid on the surface strata (surface layer) and the contaminated soil layer near the surface, and high-pressure water injection pipes under multiple underground stable rock formations in the deep layer. A structural model of storage of deep underground contaminants is shown. In general, the geological structure in which hot springs are excavated has an underground stable bedrock layer, and there is a layer containing water that has permeated from the ground in 1000 years under a slow flow. These are considered to flow slowly to the deep sea floor without leaking to the ground surface. The underground layers used by these hot springs are about 500m to 1500m deep, and the deep underground layers up to 5000m are oil-producing layers due to the accumulation of ancient marine microorganisms, and they are long-term units of 100 million years. It is a geological layer where the surface layer of the Earth generation movement is buried underground. The Japanese archipelago is a continental shelf crustal deformation region and is mainly composed of this strata structure.

The existence of hot springs in the basement where rainwater infiltrates in the mountains and permeates for a long time exists in the basement, and there is a waterproof layer (bedrock) between the ground surface and the flow from the seabed to the seabed. Is also well known. That is, it is also well known that there is a waterproof layer at the bottom of this flow that prevents water from penetrating. Since mineralized mineral water (hot spring) in the hot spring formation is effectively used, high-pressure water injection into this formation is not possible. In addition, the organic sediment layer in the deep underground is the target underground storage layer. The layer in which organic matter is deposited (oil and coal produced in many layers) is a proof that it is a stable formation because it has a history of over 100 million years and the deposited organic matter has not leaked to the surface.

The stable water layer, which contains organic substances in the lower part of the hot spring formation, needs 1000 years to leak at least to the surface and hot spring formation, so the contaminated water dissolved in heavy metals is mineralized. That is, it is incorporated into a natural circulation purification mechanism.

It can be inferred from the excavation materials in various places that the deep underground exists in the range of 700m to 3000m. Therefore, since the material of the deep underground is rock mass, the required water injection pressure needs to tear the rock mass (splitting and expanding the rock mass), and generally from 10 to 15 megapascals from the oil field example. Needed. The maximum is about 25 megapascals. The temperature at this time is estimated to be 50 to 110 degrees because the underground temperature rises about 30 degrees in units of 1000 meters. Therefore, a high-pressure pipe that can withstand this condition is required. Oil field water injection pipes meet this specification. (API standard tube)

The invention which solved the problem about the pollutant concentration method of the effect of reducing deep underground water injection will be described.

FIG. 3 shows the entire structure of the deep underground high-pressure injection of concentrated contaminated water using contaminated wash water as non-contaminated rewash water by concentrating pollutants. When washing contaminated water is concentrated, the amount of concentrated contaminated water decreases, so that washing water can be secured (circulated). Since the amount of water lost can be satisfied with natural rainwater, etc., the economic effect is great. Furthermore, since high energy is required for high-pressure injection, reducing the amount of high-pressure injection has a significant energy-saving effect, making it possible to use natural energy such as windmills and solar power generation. Purification system.

FIG. 4 is an explanatory diagram of an adsorption / aggregation method which is one of the concentration methods. The permeated purified water (polluted water) is put into a pollutant removal tank by a drainage pump, and heavy metals dissolved in the polluted water by dispersion injection of an adsorption / flocculating agent (for example, sodium sulfide: NaSH) are coagulated and concentrated. The supernatant of the tank can be reused for washing water because of low contamination concentration. The reduced concentrated sedimentary water is poured into the deep underground with a high-pressure pump. A method of using natural water such as rain water is adopted as the washing water that is reduced by water injection.

  The decompression pump shown in FIG. 4 is used for extracting volatile organic substances from a tank of contaminated water. For example, since benzene and the like are dispersed in water, they can be vaporized and recovered. The recovered organic gas is burned or oxidized with a platinum catalyst or the like. The treatment of this vaporized material has an effect of preventing explosion accidents by accumulating from the malfunction of the equipment.

The invention of recovery of volatile organic substances dispersed in water and recovery of heavy metals dissolved in water will be described.

FIG. 5 shows a recovery process of water-soluble heavy metals and volatile organic substances using an ion exchange resin membrane. Recovery of decompression and combustion of volatile organic substances is the same as described above. It is well known that polluted water can be separated from non-polluted water and pollutants with an ion exchange resin membrane. Thereafter, the ion exchange membrane is washed with an acidic detergent (for example, hydrochloric acid) and recycled. It is also possible to neutralize the acid wash water concentrated with this pollutant and stabilize it with chemical substances. In addition, the concentrated contaminated water can be treated by high-pressure injection into the deep underground.

Plan view and cross-sectional side view of the explanation regarding separation of the soil-contaminated area from the decontamination area of the soil-contaminated area according to the present invention and the injection of washing contaminated water into the deep underground Deep underground injection of the contaminated water of the present invention, and a natural circulation formation cross-sectional structure explanatory diagram that performs harmless stabilization treatment in a high-pressure and high-temperature environment for a long time Explanatory drawing which can be used only with rain water as necessary washing water by reusing water obtained by concentration of contaminated water of the present invention as washing water Natural circulation deep underground cross-sectional structure explanatory diagram to improve the efficiency by adsorbing, agglomerating and concentrating pollutants of contaminated water of the present invention and mixing high-pressure and high-temperature detoxification promoting agent in deep underground Explanatory drawing of deep underground treatment of chemical cleaning water for separation of pollutants of the present invention by ion exchange membrane and accumulation of exchange membrane of contaminants

Explanation of symbols

(1) Water pump (2) Outdoor air conditioner unit (3) Heat exchanger (4) Compressor (5) Gas tank (6) Solenoid valve (7) Refrigerant gas pipe (8) Rooftop / roof watering (9) High temperature heat storage in summer (10) Permeable pipe (11) Surface layer pipe (12) Deep layer pipe (13) Solenoid valve (14) Refrigerant gas pipe (15) Gas tank (16) Compressor (17) Heat exchanger (18) Outdoor air conditioner unit (19) Hot water supply (20) Water supply (21) Warm water tank (22) Water pump (23) Surface layer pipe (24) Part A underground (25) Permeable pipe (26) Deep layer pipe

Claims (8)

  In order to create a groundwater differential pressure curtain in the separation zone in order to separate the necessary purification area or contaminated area of the soil containing contaminants in the environmental pollution purification method of soil, the permeability of the separation zone on the ground surface A pipe is attached evenly, a difference is made between the inside and outside of the separation zone, water is poured from the permeation pipe to the ground, and a separation curtain is constructed. Similarly, separation from the underground contaminated formation is necessary. In this case, the underground seawater in the contaminated soil layer is injected and separated, and decontamination is performed by installing a permeation pipe in the contaminated area and draining the wash water containing the contaminated material, and in the deep underground below 700 meters. A system that purifies soil contamination by injecting contaminated wastewater into the deep underground with a high-pressure pump in order to mineralize harmful substances for a period of time.   In order to isolate and prevent soil contaminants such as organic substances and heavy metals that are harmful to living organisms, water-soluble waterproof materials made of water-soluble PVAC resin and cement, etc. are injected from the surface to the surface area of 2 to 5 meters of the formation. In order to prevent outflow of underground contaminants to the ground, and to prevent the spread of contamination in the contaminated area, water permeable pipes are continuously attached evenly around the contaminated area or the decontamination area, and natural rainwater etc. Inject water and control the groundwater level to prevent the outflow of pollutants. Furthermore, in order to prevent the outflow movement of contaminated groundwater, if necessary, the waterproof layer is injected from the surface like the surface layer to prevent the outflow of pollutants from the bottom. Multiple decontamination water, such as rainwater, is poured from the permeation pipes attached to the contamination boundary, and the contaminated water is drained from the permeation pipes in the contaminated area to clean the pollutants over time. A method of decontamination of contaminated soil by detoxifying it with high pressure water.   In order to remove, for example, benzene, which easily vaporizes organic substances that are harmful substances from the collected contaminated water, the recovery tank for cleaning water containing harmful substances is decompressed to reduce the organic substances. A method of treating volatile organic substances by evaporating and recovering, evaporating the vaporized gas at high temperature or oxidizing it with a catalyst such as platinum.   In claim 1, claim 2, etc., in order to concentrate the contaminated washing water contaminants in order to reduce the amount of waste washing water for high-pressure water injection, a flocculant (for example: sodium sulfide) is added to the recovered washing water tank. : NaSH, etc.) is diffused and injected into the required amount to agglomerate and precipitate dissolved heavy metals, water with extremely low contamination concentration in the tank supernatant is separated and used again as washing water for water injection, and hazardous substances are concentrated and reduced in volume A method of purifying soil contamination by injecting water under high pressure.   In order to reduce the amount of waste washing water to which high-pressure water is injected, the dissolved heavy metal of the contaminated washing water is separated from the water containing the contaminants by an ion exchange resin membrane. A soil contamination treatment method in which the replacement resin is regenerated by washing with acetic acid, etc., and washed acidic water (contaminated water-dissolved water whose heavy metal concentration is increased and the final treatment amount is reduced) is injected into the deep underground at high pressure.   The high-pressure injection pump power with reduced water injection amount to the deep underground in claim 4 or claim 5 is a 15 to 25 megapascal high-pressure water injection pump required by utilizing natural energy such as windmills and solar power generation energy. A soil purification device configured to obtain power.   In a treatment method in which contaminated water containing a harmful substance is poured into the deep underground, and retained in the deep underground for at least 1000 years to mineralize the harmful substance, the deep underground temperature is at least 50 Depth layer containing heavy metals that dissolve in an environment with an absolute pressure of 10 megapascals or higher and chemicals that promote the reaction to mineralize organic substances (for example, sodium sulfide: NaSH, hydrochloric acid, sulfuric acid, iron sulfate, caustic soda, etc.) A method of mineralizing by high-pressure water injection underground.   Water-resistant waterproof material made of water-soluble PVAC resin and cement, etc. is injected from the surface to the surface layer area of 2 to 5 meters above the surface layer to prevent outflow of underground pollutants to the ground. In order to prevent this, water permeable pipes are continuously attached evenly around the contamination or decontamination area, and natural rain water is injected to control the groundwater level to prevent the outflow of pollutants. Furthermore, in order to prevent the outflow movement of contaminated groundwater, if necessary, the waterproof layer is injected from the surface like the surface layer to prevent the outflow of pollutants from the bottom. Multiple decontamination water, such as rainwater, is poured from the permeation pipe attached to the contamination boundary, and the contaminated water is drained from the permeation pipe in the contaminated area to clean the contaminants. Evaporation of certain organic substances, such as benzene, to remove benzene, etc., the recovery tank containing harmful substances is depressurized and the organic substances are vaporized and recovered, and the vaporized gas is burned at high temperature or oxidized with a catalyst such as platinum and volatile. A system that treats organic matter, separates contaminants from the treated wash water with an ion exchange resin membrane, regenerates the ion exchange resin by washing with acetic acid, etc., and purifies soil harmful substances.

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