TW200410910A - A system and method for delivering electron acceptors and /or electron donors to contaminated aquifer - Google Patents

Abstract

A system and method for delivering electron acceptors and / or electron donors to contaminated aquifer. The system contains a main line of a large diameter and numerous reduced-diameter lines branching from the main lines in parallel array. The method is to inject electron acceptors and / or electron donors in gas or vapor state pneumatically through the system into contaminated aquifer. Delivering electron acceptors and / or electron donors in gas or vapor state provides effective mixing with microorganisms and the contaminants in aquifer. The method and system is capable to deliver electron acceptors and donors to contaminated aquifer with radius of influence greater than vertical and horizontal wells. Also, by delivering electron acceptors and / or electron donors in gas or vapor state avoids potential clogging near the injection points due to excessive microbial growth.

Description

200410910 V. Description of invention [Petroleum organic pollution, health problems, economic development, and known methods. Concentration of water to remediate the affected water. Locally pay attention to on-site (or) electricity recipients and / or electricity (1) Hydrocarbon dyes that belong to them. Because of effective remediation, natural reduction will occur. However, since the petroleum carbon bioremediation survey, sub-supply or electronic supply technology Field] Compounds and organic compounds are the most common groundwater and soil. These compounds often dissolve in drinking water sources and cause severe national groundwater. Drinking water source treatment methods used in many parts of the world are very important and meaningful. Methods include extraction treatment, gas stripping and soil gas extraction have also been shown to degrade soil and groundwater organic pollution, although degradation is usually slow. Most of the research and development and field application of soil and underground treatment technologies contaminated by hydrogen compounds and gas-containing organic compounds are commonly used in on-site bioremediation. They are selected by the teacher, or used as a nutrient salt, electronic receiver, and others. Few research developments have noticed improvements in injecting electronic connector suppliers into the system and improving the efficiency of the mixed contact between the electronic receiver and the underground with the pollutants

Page 6 200410910 V. Description of the invention (2) Effective radius is about 3 to 8 meters. According to field tests, Ac Omb et al. (1 995) reported that under the steady flow state of gas injection rate of 450 litres / min, the maximum rectification radius of the gas stripping method was about 4.5 meters. Lun d e g a r d et al. (2001) reported from the field test that the effective gas injection distance of the horizontal gas injection well can reach 15 meters.

Hopkins and McCarty (1995) report aerobic co-metabolization of trichloroethylene and chloroenes with phenol and toluene as the main substrates. McCarty et al. (1998) used oxygen and hydrogen peroxide as the electron acceptors and toluene as the main substrate to rectify the site contaminated with three gas ethylene. The above electron acceptor and main matrix are all injected into the underground aquifer by injection wells after being mixed with water on the surface. MeCarty et al. (1989) reported problems found in the field operation of injection wells, including inadequate mixing of the electron acceptor and main matrix with the pollutants injected into the aquifer; over-growth of microorganisms near the injection well caused blockage of the well screen. Me C a r t y et al. (1 998) used a pulse injection method to help toluene to be more evenly distributed in the aquifer, but the effective path length was also within 10 meters. [Summary of the Invention] Conventional vertical or horizontal wells are used to inject electron receivers and / or electron suppliers into the polluted aquifer to degrade organic pollutants. The above conventional methods have difficulties in effectively distributing electron receivers and / or electron suppliers in the aquifer, and most of them are limited to injection wells. The present invention provides a method and system for injecting an electron acceptor and / or an electron supplier into a contaminated aquifer. The method can effectively and uniformly distribute electron acceptors and / or electron suppliers in an aquifer, and effectively

200410910 V. Description of the invention (3) The injection radius is larger than the conventional vertical or horizontal well. The injection system of the present invention first starts with a large-diameter gas injection main, and then passes through the gas injection main in parallel to separately distribute a plurality of small-diameter gas injection branch pipes, and finally enters the aquifer. The large-caliber injection system can place electron receivers and / or electron suppliers over long distances without excessive pressure drop. Each of the parallel gas injection branch pipes is equipped with a flow control device and a porous restricted outflow gas pipe, which can effectively control the distribution of the electron receiver and / or the electron supplier in the aquifer.

The present invention uses a pneumatic method to inject the electron acceptor and / or electron supplier into the contaminated aquifer in a gaseous state. Gaseous injection of the electron acceptor and / or the electron supplier provides a sufficient and effective mixture with the microorganisms and pollutants in the aquifer. The method for injecting the electron receiver and / or the electron supplier into the aquifer has a larger effective radius than the conventional vertical and horizontal well methods. In addition, the present invention injects the electron acceptor and / or the electron supplier into the aquifer in a gaseous state can effectively avoid the problem that the conventional method often blocks the sieve with the microorganisms in the vicinity of the injection well. [Embodiment] In order to make the technical means, inventive features, objectives and functions used in the present invention easy to understand, the specific embodiments and drawings and numbers are described in detail as follows:

Detailed description of the first preferred embodiment (an example of injecting air as an electron receiver into an aquifer): FIG. 1 is a schematic diagram of a parallel air injection method and system according to the present invention. The injection of air (5) first enters the large-diameter gas injection main (1), and then the gas injection main (1) enters multiple small-diameter gas injection branches (2) in parallel.

200410910 V. Description of the invention (4)); Gas injection bronchus and trachea <3). }) Parallel exhaust pipe (1 1) Parallel air jet distribution, the pressure parallel air jet distribution. As shown in Figure 3, the conventional vertical or injection system that can reach at least 20 is better than the string. The second one is through the venturi (2) column of the present invention. The other connected stringing system is the injection system, which can be seen in the meter. The far-level injection-coupled type is more concrete. (2) Each current limit diagram. Series column static pressure series-type air injection. Each is equipped with a flow and a gas injection branch. Figure 2 shows the pressure distribution and pressure minus water flow distribution of the tandem arrangement and the invention of the parallel type is greater than the series type. The figure can detail the detailed benzene vapor of the air (electrical ( 4) and each of the outflow-limiting outlet pipes (3. Figure 3 compares the air injection system. Figure 4 compares the injection system of the air injection system and the aquifer of the invention in parallel. The air is used for electricity) to inject the limited-outflow air pipe ( ) An example of the method for injecting water into the water layer of the invention is shown in FIG. 6). The method of entering the flow control layer (1 layer of toluene is injected into the air in a gas state) is as follows: The system and the system for toluene injection of small-diameter gas injection device 0) ° concentration points (electronic method invention air to carry toluene through a Venturi tube to steam Schematic diagram of parallel injection. The injection of air (5) first enters the Venturi tube (solution (7)) to vaporize, and carries toluene vapor (8) into the main pipe (1), and then the gas injection pipe (1) is used for parallel sub-gas injection. The branch pipe (2); the gas injection branch pipes (2) are each equipped with (4) and the outflow-limiting gas pipe (3), and finally enter the water content. Figure 6 is a water distribution map of the toluene steam parallel injection system of the present invention. It can be confirmed that the recipient of the present invention) carries toluene vapor (electron supplier) to distribute the electron supplier uniformly in the aquifer with gas energy.

200410910 V. Description of the invention (5) In summary, the embodiments of the present invention can indeed achieve the expected use effect, and the specific structure disclosed is not only not seen in similar products, nor has it been disclosed before the application. It fully complies with the provisions and requirements of the Patent Law, and submits an application for an invention patent in accordance with the law.

200410910

简单 style simple illustration diagram brief description] Figure 1 Schematic diagram of parallel air injection method and system of the present invention 丨 丨 Serial type air injection method and system schematic diagram Comparison diagram of pressure distribution Figure 4 Comparison of flow distribution of parallel air injection system of the present invention and flow distribution of series air injection system of the present invention Figure 5 Schematic diagram of parallel injection method and system of toluene vapor carried by air through venturi in the present invention Figure 6 of the present invention Toluene concentration distribution diagram of toluene vapor in parallel injection system in water layer, please refer to Figure No. 1) Gas injection main pipe (2) Gas injection branch pipe 3) Outflow limiting gas pipe (4) Flow control device 5) Air (6) 7) Toluene solution (8) Toluene vapor 9) Unsaturated layer (1 0) Water-containing layer 1 1) Gas injection tube page 11

Claims (1)

200410910 VI. Method of applying for patent scope 1 method, the branch of the sub-supply pipe is equipped with 2 suppliers, the branch of the sub-receiver pipe is equipped with 3 layers of the test gas system into the system injection to the far limit of the distribution of 4 layers The system supplies the supplier with the gas injection and gas injection branch pipe diameter reduction of the effective supplier and the perforated cloth. Recipient injection gas injection gas injection branch pressure reduction and porous cloth. The receiver and the system include multiple small mouths and electronic gas injection control. The electronic connection includes the large-caliber and the electronic control with the large-caliber layer that needs to be controlled excessively. The branch is the electronic method. Subsystems accept effective parallel control. • One system contains multiple small persons without water flow. • One system contains multiple small persons without water flow. A system in which gas and gas are mixed into a contaminated aquifer and a gas pipe, and the gas pipe is connected in parallel by a gas injection pipe. A large-diameter injection system can inject electricity to a long distance, and the parallel gas injection is limited to flow out. The trachea can effectively control the electrons into the contaminated aquifer, the system and the supervisor, and then the gas injection supervisor can inject electricity to a long distance in parallel with the large-diameter injection system, and the parallel gas injection branch outflow trachea can effectively control the electrons. The electronic supplier injects the contaminated water-containing large-diameter gas injection supervisor, and then the gas injection branch pipe of the diameter injection. The large-diameter injection supplier does not need Excessive pressure drop is equipped with a flow control device and a porous receiver and an electron supplier. The method of injecting the electron receiver and the electron supplier into the contaminated water method in the aquifer uses a pneumatic method to inject the electron receiver and the electric state into the receiver. Polluting the aquifer, injecting the electron acceptor and the electron can provide charging with the microorganisms and pollutants in the aquifer. The present invention injects the electron acceptor and the electron supplier into the aquifer. Page 12 200410910 VI. Patent application scope The effective radius of the water layer is greater than the conventional vertical and horizontal well methods. In addition, the present invention injects the electron receiver and the electron supplier into the aquifer in a gaseous state can effectively avoid the conventional method near the injection well. Common problems with microbial overgrowth blocking well screens. 5 · For the method of injecting the contaminated aquifer with the electron acceptor and the electron supplier in item 4 of the patent application, the underground pollutants are trichloroethylene, the electron acceptor is oxygen, and the electron supplier is toluene vapor. Page 13 0 ~ Ί