JP2006239555A - Apparatus for purifying substance polluted by organic chlorinated compound - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for purifying a substance polluted by an organic chlorinated compound in which treatment with an aerobic microorganism A and treatment with an anaerobic microorganism B are efficiently performed using their individual decomposition tanks. <P>SOLUTION: There is provided the apparatus for purifying a substance polluted by an organic chlorinated compound in which a first decomposition tank 1 and a second decomposition tank 4 provided with stirrers 3, 6, respectively, therein, are connected in series, and while the inside of the first decomposition tank 1 is under an aerobic condition and the inside of the second decomposition tank 4 is under an anaerobic condition, a pollutant p polluted by an organic chlorinated compound, the aerobic microorganism A and the anaerobic microorganism B are mixed and introduced to the first decomposition tank 1, whereby a part of the organic chlorinated compound that is contained in the pollutant p is oxidized and decomposed to form a primary treated product p1, which is introduced to the second decomposition tank 4 and the remaining organic chlorinated compound is reduced and decomposed to form a second treated product p2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a device for purifying substances contaminated with organochlorine compounds, and more particularly, a device for purifying substances such as soil and ash contaminated by organochlorine compounds such as dioxins so as to be harmless to the human body. It is about.

  Conventionally, as one of the environmental problems, purification of pollutants such as soil and ash contaminated with organic chlorinated compounds such as dioxins has been performed. As the method, a melting method, a thermal decomposition method, a supercritical extraction method, a biological method, and the like have been proposed. Among these, when purifying pollutants with a relatively wide range and a low concentration, biological methods are preferred from the economical and technical viewpoints.

This biological method is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-34128 (hereinafter referred to as Patent Document 1) or the present applicant and previously disclosed in Japanese Patent Application Laid-Open No. 2003-164849 (hereinafter referred to as Patent Document 2). 2-8 chlorinated dioxins by mixing anaerobic microorganisms and aerobic microorganisms into pollutants and allowing the pollutants to grow and metabolize the anaerobic microorganisms under anaerobic conditions. 1 to 3 chlorinated dioxins are oxidatively decomposed by reductive decomposition, that is, reductive dechlorination, and then allowing aerobic microorganisms to proliferate and undergo metabolic activity under aerobic conditions. Then, while repeatedly putting this pollutant under anaerobic conditions and aerobic conditions, dioxins and the like are subjected to reductive decomposition and oxidative decomposition to thereby remove pollutants such as soil and ash contaminated with organochlorine compounds. It is intended to be purified.
JP-A-10-34128 Japanese Patent Laid-Open No. 2003-164849

  By the way, in the apparatus used for the method for purifying a substance contaminated with an organic chlorine compound by the conventional biological method as described above, since it takes a long time for the purification, there is a practical problem. In other words, since the atmosphere is adjusted by alternately repeating contaminated substances in an anaerobic condition and an aerobic condition, not only this condition formation takes time, but also a batch process is required. It will take time. As a result, there is a problem that a large amount of contaminants cannot be processed.

The present invention has been made in order to solve the disadvantages of the conventional pollutant purification device as described above,
1) In the invention described in claim 1, the first decomposition tank and the second decomposition tank, each of which includes a stirrer, are connected in series, the inside of the first decomposition tank is in an aerobic condition, The second decomposition tank is made anaerobic and mixed with the pollutant contaminated with organochlorine compound, aerobic microorganisms and anaerobic microorganisms in the first decomposition tank. A part of the organochlorine compound contained in the product is oxidatively decomposed to obtain a primary treated product, the primary treated product is introduced into the second decomposition tank, and the remaining organochlorine compound is reduced and decomposed to produce a second treated product. It is intended to provide a purification device for substances contaminated with organochlorine compounds.

  According to the purification apparatus for a substance contaminated with an organic chlorine compound configured in this manner, an aerobic condition and an anaerobic condition are formed in different decomposition tanks in advance, and the decomposition tank having the different conditions is formed in the decomposition tank. Since the contaminants are sequentially introduced and treated (purified), the treatment can be efficiently performed without the need for adjusting the time required to form the aerobic condition and the anaerobic condition. Furthermore, since the contaminants can be processed continuously, it is extremely effective particularly when a large amount of contaminants are processed.

  2) Further, in the invention according to claim 2, an air supply device and an oxygen concentration meter are provided in the first decomposition tank, and the oxygen concentration in the first decomposition tank is detected by the oxygen concentration meter. A predetermined amount of air is supplied from the air supply device into the first decomposition tank by a signal.

  According to the purification apparatus for a substance contaminated with an organic chlorine-based compound thus configured, the organic chlorine-based compound is oxidatively decomposed in the first decomposition tank, so that the oxygen in the first decomposition tank is Although the concentration decreases, this state can be detected and air, that is, oxygen can be supplied to maintain the aerobic condition, so that continuous processing is possible.

  3) Further, in the invention according to claim 3, a moisture supply device and a moisture meter are provided in the second decomposition tank, and the moisture of the first processed product introduced into the second decomposition tank by the moisture meter is reduced. It is a purification device for a substance contaminated with an organochlorine compound which is detected and supplied with water from the moisture supply device into the second decomposition tank.

  And according to the purification apparatus for a substance contaminated with an organic chlorine-based compound configured in this way, a pollutant whose water content has decreased due to oxidative decomposition in the first decomposition tank is added to the second decomposition tank. Anaerobic conditions can be maintained by supplying the necessary moisture.

  4) Furthermore, the invention described in claim 4 is contaminated with an organochlorine compound in which the discharge port of the first decomposition tank and the input port of the second decomposition tank are communicated with each other through a communication pipe having a sealing mechanism. It is a purification device for the material.

  According to the purification apparatus for a substance contaminated with an organic chlorine-based compound configured as described above, the first treated product oxidized and decomposed in the first decomposition tank is easily introduced into the second decomposition tank. And anaerobic conditions in the second decomposition tank can be maintained.

  5) The invention according to claim 5 is a purification apparatus for a substance contaminated with an organochlorine compound in which a part of the second treated product is supplied into the first decomposition tank.

  According to the purification apparatus for a substance contaminated with an organic chlorine compound configured as described above, an aerobic microorganism and an anaerobic microorganism contained in the second treated product can be circulated and used.

  As is clear from the above explanation, according to the purification apparatus for a substance contaminated with an organochlorine compound according to the present invention, an aerobic condition and an anaerobic condition are formed in an independent decomposition tank in advance, and the different Since it is necessary to introduce and process (purify) pollutants sequentially in a decomposition tank that has conditions, there is no need for the time required to form aerobic and anaerobic conditions, and the pollutants are processed continuously. Therefore, it can be processed in large quantities and is extremely effective in practice.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
FIG. 1 is a schematic side view of a purification apparatus for a substance contaminated with an organic chlorinated compound. Reference numeral 1 denotes a first decomposition tank in which a stirrer 3 rotated by a driving device 2 is installed. Reference numeral 1a denotes a horizontal cylindrical body, and 4 arranged at the lower stage thereof is a second decomposition tank in which a stirrer 6 rotated by a driving device 5 is installed. The second decomposition tank 4 is arranged in series via the communication pipe 7.

  The inside of the first decomposition tank 1 is kept under aerobic conditions, and the inside of the second decomposition tank 4 is kept under anaerobic conditions. Further, a mixture (A, B) of the pollutant p contaminated with the organochlorine compound in the main body 1a from the upstream side of the first decomposition tank 1, and the aerobic microorganism group A and the anaerobic microorganism group B. , p) is preferably supplied into the first decomposition tank 1 through a supply device 8 having a mixing function to oxidatively decompose a part of the organochlorine compound contained in the pollutant p. The primary treated product p1 is supplied to the second decomposition tank 4 via the communication pipe 7, and the remaining organic chlorine compound is reduced and decomposed continuously to the secondary treated product p2. It is configured to process.

  Examples of “anaerobic microorganisms and aerobic microorganisms” are as follows.

  The anaerobic microorganism or aerobic microorganism having a resolution for dioxins is not limited to a single species, and a group of microorganisms including a plurality of species and strains can also be used. These microorganisms can be collected by known screening methods from dioxins pollutants and the like, so that they can be cultured and used as seeds.

  In addition, known microbial species, strains, fungal groups and the like that are known to have a decomposing activity for dioxins and the like can be used as long as they are compatible with the present invention.

  Representative examples of `` anaerobic microorganisms '' having a resolution against dioxins include anaerobic archaea such as the genus Methanobacterium, Methanosarcina, and Methanolobus, and Acetobacterium. ), Desulfobacterium, Desulfomonile, Dehalosplillum, Dehalobacter, Dehalobacterium, Dehalocuccoides, Clostridium ( In addition to anaerobic bacteria such as Clostridium genus, Citrobacter genus, Escherichia genus, Enterobacter genus, Serratia genus, Proteus genus, Shewanella genus, Mention may be made of facultative anaerobic bacteria such as the genus Staphylococcus.

  In addition, representative examples of `` aerobic microorganisms '' having a resolution against dioxins include the genus Sphingomonas, Burkholderia, Ralstonia, pseudomonas, nocardioides (Nocardioides) Examples include the genus Nocardioides, the genus Rhodococcus, and the genus Terrabacter.

  More specifically, in the first decomposition tank 1, an aerobic condition for the aerobic microorganism group A to actively propagate and metabolize, that is, the heating device 10 (electricity) attached to the main body 1a. The condition that the predetermined temperature (for example, 10 ° C. to 40 ° C.), moisture content (for example, 30 to 40%) and pH (for example, 5 to 8) is given by a control device (not shown) is given by the heater. And kept in a gentle stirring state of 1 rpm to 10 rpm.

(First decomposition tank 1)
In the first decomposition tank 1 in which such aerobic conditions are maintained, the soil mixed with the aerobic microorganism group A and the anaerobic microorganism group B and the contaminated soil are fed by a supply device 8 such as a screw conveyor. It is introduced into the first decomposition tank 1 from the introduction port 11. Then, the aerobic microorganism group A grows and is metabolized to oxidatively decompose organochlorine compounds, particularly 1 to 3 chlorinated dioxins, contained in the pollutant p, thereby generating a first treated product p1.

  At this time, since it is gently stirred by a stirrer 3 such as a screw feeder built in the first decomposition tank 1, this oxidative decomposition is further promoted. The primary processed material a1 thus produced is introduced from the discharge port 13 into the supply port of the second decomposition tank 4 through the communication pipe 7 having the multiple valve 14 constituting the seal mechanism. Of course, the inside of the second decomposition tank 4 is also controlled by a device (not shown) so as to have a predetermined temperature, moisture content, pH, or oxygen concentration, that is, anaerobic conditions. Therefore, anaerobic microorganisms B present in the primary treatment product a1 introduced into the second decomposition tank 4 grow and metabolize to reduce organochlorine compounds, particularly 2-8 chlorinated dioxins. Decompose.

  Of course, since the primary treatment product p1 supplied by the agitator 6 such as a screw feeder at this time is agitated, its reductive decomposition action is promoted, and the discharge port 16 having the multiple valve 15 as the purified secondary treatment product p2. Is discharged out of the system without disturbing the atmosphere inside the main body. In this way, the pollutant p is continuously purified.

  The first decomposition tank 1 is provided with an air supply pipe 21, a branch pipe 21a, and an oxygen concentration meter 22 having a control valve 20 and connected to an air supply device (not shown). A signal V1 of the oxygen concentration meter 22 The control valve 20 is controlled to introduce air into the first decomposition tank 1. That is, if the organic chlorine compound contained in the pollutant p is continuously oxidized and decomposed in the first decomposition tank 1, the oxygen concentration in the first decomposition tank 1 decreases. It is necessary to keep the oxygen concentration at 1.0%. When the oxygen concentration is insufficient below 0.5%, oxygen is supplied to maintain a predetermined oxygen concentration. Therefore, this oxygen concentration drop state is detected by the oxygen concentration meter 22, and the control valve 20 is controlled to introduce air.

(Second decomposition tank 4)
FIG. 2 shows another embodiment of the second decomposition tank 4. The second decomposition tank 4 includes a water line 34 having a control valve 32 and a nozzle 33 as a moisture supply device, and a moisture meter 35. The required water W is introduced into the second decomposition tank 4 by controlling the control valve 32 by the signal V2 of the moisture meter 35. Of course, the water W serves to form a predetermined anaerobic condition and also serves as a surfactant.

  FIG. 3 shows still another embodiment of the purification apparatus for substances contaminated with organochlorine compounds according to the present invention. The same reference numerals as those in FIG. 1 denote the same names.

  In FIG. 3, a branch pipe 30 is protruded and connected to the discharge port 16 a of the second decomposition tank 4, and the first decomposition tank 1 is charged by a gas transfer device 31 (air lifter) and a connecting pipe 32. This is an apparatus connected to the mouth 11 to form a reflux path.

  The secondary treatment product p2 discharged from the second decomposition tank 4 together with the air supplied to the transfer device 31 by the apparatus is circulated into the first decomposition tank 1 through the inlet 11 of the first decomposition tank 1. It has become. By circulating the secondary treated product p2 to the pollutant, the aerobic microorganism A and the anaerobic microorganism B contained in the secondary treated product p2 can be effectively used without being wasted. .

It is a sectional side view which shows the Example of the purification apparatus of the substance contaminated with the organochlorine compound by this invention. It is a side view for demonstrating the other Example of the 2nd decomposition tank used as a purification apparatus of the substance contaminated with the organic chlorine type compound by this invention. It is a schematic side view for demonstrating the other Example of the purification apparatus of the substance contaminated with the organochlorine compound by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... First decomposition tank 2, 5 ... Drive device 3, 6 ... Stirrer 4 ... Second decomposition tank 8 ... Supply device (screw conveyor)
11, 16... Inlet 13... Outlet 14, 15 .. multiple valve 7, 16 .. communication pipe 20, 32 .. control valve 21 .. air supply pipe 22. Densitometer 33 ... Nozzle 34 ... Water pipe 35 ... Moisture meter

Claims (5)

Each of the first cracking tank and the second cracking tank each containing a stirrer is connected in series, the inside of the first cracking tank is set to an aerobic condition, and the inside of the second cracking tank is set to an anaerobic condition. And a part of the organic chlorine compound contained in the pollutant by mixing and introducing the pollutant contaminated with the organic chlorine compound, the aerobic microorganism and the anaerobic microorganism into the first decomposition tank. An organic chlorine-based product characterized in that the first treated product is introduced into the second decomposition tank and the remaining organochlorine compound is reduced and decomposed to obtain a second treated product. Purification equipment for substances contaminated with compounds. An air supply device and an oxygen concentration meter are provided in the first decomposition tank, the oxygen concentration in the first decomposition tank is detected by the oxygen concentration meter, and the first decomposition tank is sent from the air supply device by the signal. The apparatus for purifying a substance contaminated with an organochlorine compound according to claim 1, wherein a predetermined amount of air is supplied into the interior. A moisture supply device and a moisture meter are provided in the second decomposition tank, the moisture of the first processed material introduced into the second decomposition tank is detected by the moisture meter, and the first signal from the moisture supply device is detected by the signal. The apparatus for purifying a substance contaminated with an organochlorine compound according to claim 1 or 2, wherein water is supplied into the second decomposition tank. 4. A purification apparatus for a substance contaminated with an organochlorine compound according to claim 1, wherein the discharge port of the first decomposition tank and the input port of the second decomposition tank are communicated with each other by a communication pipe having a sealing mechanism. The apparatus for purifying a substance contaminated with an organochlorine compound according to any one of claims 1 to 4, wherein a part of the second treated product is fed back into the first decomposition tank.

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