JP2006167634A - Treating method and treating system of sludge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To divide sludge water into solid matter and steam at once. <P>SOLUTION: In this sludge treating method, a jet gas burner blows jet gas flame against the sludge water in a treating furnace to perform ultra-high temperature heating of the sludge water in an instant. Thus moisture and low melting point materials are evaporated, a dust collector divides evaporated gas into solid and gas, further the separated gas is divided into gaseous hydrogen and non-permeated gas via a separation membrane. The non-permeated gas is treated and obtained clean gas is discharged to the external world. The solid separated by the dust collector is collected and the solid matter such as non-sublimated metal remaining in the treating furnace is recovered. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sludge treatment method and a treatment system for treating domestic wastewater sludge and other sludge containing harmful substances.

  In the conventional sludge treatment generally adopted, the sludge is dried and incinerated after the moisture content is lowered.

  In addition, a technique for thermally decomposing the surface layer of the ground contaminated with dioxin in situ has been proposed.

Furthermore, a technique for introducing a brown gas into a waste incinerator and burning the waste at a high temperature is also disclosed.
JP 2004-243157 A JP 2000-39123 A

  The technique employed in the prior art has a problem in that since the sludge is dried and then incinerated, the treatment process is in two stages, and the treatment equipment and running cost are enormous.

  In addition, the inventions of the cited documents 1 and 2 may function effectively for soil having a low water content, but for example, sludge with a moisture content of 90% or more cannot be used as it is. was there.

  Furthermore, Patent Document 1 describes the use of a brown gas burner, but does not describe a treatment technique when used for sludge with a lot of moisture.

  In this invention, moisture and a low-melting-point substance can be instantly vaporized by blowing a jet gas flame from a jet gas burner to the sludge accommodated in the treatment furnace, so that the sludge can be treated continuously. .

  Further, since the zet gas flame is generated in a closed space, all the heat is effectively used and the efficiency is very good. Since the zet gas is a mixed gas of hydrogen gas and oxygen gas, even if there is no supply of oxygen from the outside, the objective can be sufficiently achieved with the oxygen that the user has.

  In addition, when using a heat-resistant catalyst such as ceramics, a part of the water can be changed to a jet gas. For example, when water collides with a ceramic catalyst of 2000 ° C. to 3000 ° C., the water becomes water vapor, and part of the water vapor changes into hydrogen gas and oxygen gas. In this case as well, the ratio of hydrogen gas to oxygen gas Since the ratio required for combustion is maintained, complete combustion is achieved without excess or deficiency.

  That is, the invention of the method is to blow a jet gas flame from a jet gas burner to the sludge water in the treatment furnace, instantaneously heat it to ultra high temperature to vaporize moisture and low melting point substance, and the evaporated gas is gas and solid by a dust collector. The separation gas is separated into hydrogen gas and non-permeated gas through a separation membrane, the non-permeated gas is processed to release clean gas to the outside, and the solid separated by the dust collector is collected. A sludge treatment method characterized by recovering unsublimated metal and other solids remaining in a treatment furnace. Zet gas is a mixture of hydrogen gas and oxygen gas generated by electrolyzing water and mixed gas. The separation membrane is a hydrogen gas permeable membrane, and is stretched so as to bisect the inside of the separator. The exhaust gas is led to one side of the permeable membrane, and the hydrogen gas outlet is provided on the other side. Is.

  Next, the invention of the system includes a processing means for incinerating sludge water with a jet gas flame, a dust collecting means for exhaust gas generated by the processing means, a separation means for processing the gas, a gas processor and a solid It is a sludge treatment system characterized by combining a material treatment means, the treatment means is a combination of a treatment furnace with a jet gas burner, a sludge feed means, and an exhaust means, and a separation means is A separation membrane is stretched in the tank, exhaust is supplied to one side of the separation membrane, and an outlet for hydrogen gas is provided on the other side. The dust collecting means is a cyclone.

  Further, the processing means installs a heat-resistant catalyst rooster at the lower part of the processing furnace, blows a jet gas flame from the jet gas burner to the lower surface portion of the heat-resistant catalyst rooster, from the upper part of the processing furnace toward the upper surface of the rooster. The pressurized sludge injection means is provided, and the pressurized sludge injection means is pumped.

  The jet gas in the present invention is a gas obtained by mixing hydrogen gas and oxygen gas generated by electrolyzing water as it is, and approximates the characteristics of brown gas.

  Therefore, when the jet gas is blown onto the sludge with a jet gas burner, the flame instantly rises to 2000 ° C to 4000 ° C, so that water as well as low-melting-point substances are gasified (sublimated), and heavy metals and other unexposed Since the sublimate remains, it is separated and reused as a useful product. Therefore, after separating the solid matter in the exhaust gas and then separating the hydrogen gas, if the remaining gas is treated and released to the outside, the entire process is completed.

When sludge water is irradiated to the sludge water used in the present invention, it becomes an extremely high temperature (1000 ° C. to 4000 ° C.), and all things are dissolved, but there is no risk of moving to other things. Also, since the zet gas itself contains oxygen, it will continue to burn even in places where there is no air. Furthermore, zet gas has the characteristics shown in Table 1.

  As described above, zet gas has characteristics as compared with fossil fuel or fossil gas, and therefore heats the target product to the target temperature and does not emit pollutants, so it is optimal for sludge treatment.

  In the present invention, since sludge is heated and evaporated by using a zet gas generated by electrolyzing water, the amount of heat of heating is clean, and there is an effect that no harmful gas is generated.

  Further, even if toxic gas is contained in the exhaust, since it is processed after separation, there is an effect that no harmful gas is released to the outside.

  Moreover, according to this invention, sludge is processed completely and a waste becomes close to zero.

  According to the present invention, sludge is supplied into the treatment furnace, and a jet gas flame is blown from the top of the sludge to sublimate substances other than those having a high specific gravity such as heavy metals, and therefore can be easily separated. Next, solid gas separation is performed (for example, using a cyclone), and then hydrogen is separated, and then the remaining gas is treated to form a clean gas. Therefore, there is no risk of contaminating the outside environment with respect to sludge treatment. Heavy metals can be classified and reused.

  Since the zet gas in the above is a clean gas, it will be processed cleanly as a whole, and there is no fear of environmental destruction that has been regarded as a problem in the past.

  An embodiment of the present invention will be described with reference to FIG. 1. The sludge water (for example, sludge water mixed with 90% or more of water) is fed to the treatment furnace, and from a plurality of jet gas burners installed in the treatment furnace to the jet gas. Ignite and blow.

  In this case, the sludge is instantly heated to about 2500 ° C., and water and a low-temperature vaporized substance (for example, sublimated at 2000 ° C. or less) are vaporized, sucked into the suction device, and sent to the dust collector. This dust collector is, for example, a cyclone and automatically separates gas and solid matter.

  When the solid gas is separated as described above, hydrogen is separated by the separation membrane, and the remaining exhaust gas is treated by the gas treatment cylinder, and only the harmless gas is discharged to the outside.

  Solids separated from gas are, for example, metals that have not been sublimated, ceramics, and other inorganic materials. However, metals are separated and reused, and other inorganic materials (such as sand, stones, and other ceramics) are dissolved. After that, it is granulated (for example, 1 mm to 5 mm) by water granulation or air crushing, and used as a material for aggregates such as building materials or blocks.

  An embodiment of the system of the present invention will be described with reference to FIGS. 2 and 3, wherein the gas furnaces 2 and 2, the sludge water feed pipe 3 and the suction device 4 are connected to the processing furnace 1. The discharge side of the suction device 4 is connected to the input side of the dust collector 5, and the discharge side of the dust collector 5 is connected to the input side of the membrane separator 6. This membrane separator 6 separates only hydrogen by the separation membrane 7. The exhaust gas from the separator 6 is processed by the gas processing cylinder 8 and discharged from the chimney 9 to the outside as indicated by an arrow 16.

  Moreover, zet gas transmits and supplies water to the zet gas generator 10, and electrolyzes water to generate zet gas. In the figure, reference numeral 11 denotes a distributor, which sends zet gas to a necessary place as indicated by an arrow 17.

  Next, the embodiment of FIG. 3 shows another structure of the processing furnace 1.

  A ceramic rooster 12 is installed at the center of the processing furnace 1a in FIG. 3, and a zet gas burner 2, 2 is installed at the lower portion of the rooster 12 to heat the rooster 12.

  The end of the sludge water pipe 13 is fixed to the upper side wall of the rooster 12.

  In the above, when the sludge water is fed from the water feeding tube 13 onto the rooster in the processing furnace 1a as indicated by the arrow 14 and the lower surface of the rooster 12 is heated by igniting the jet gas burners 2 and 2, The lower surface is heated to 2000 ° C., for example.

  Therefore, the water and the low-melting point substance sublimate and rise as indicated by arrow 15 and are sucked into the suction device 4 as shown in FIG. On the other hand, it becomes a solid 18 (for example, metal) that does not sublime and accumulates under the rooster 12.

  In the above, the ceramic rooster 12 has a catalytic action and generates hydrogen gas and oxygen gas when the sewage is decomposed, so that the hydrogen gas can be separated by the exhaust treatment.

  The electrolysis of water used to generate the jet gas used in the present invention will be described with reference to FIG. 4. A large number of electrode plates 21 and 21 are installed in parallel in the electrolytic cell 20, and each electrode plate 21 and 21 is a conductive plate. 22 and 22a form a positive pole and a negative pole, respectively. One end of a water supply pipe 23 is connected to the lower part of the electrolytic tank 20, and the other end of the water supply pipe 23 is connected to an electrolytic water tank 24.

  Further, the upper end of the electrolytic cell 20 is connected to the base end of the drainage pipe 25, and the other end of the drainage pipe 25 is connected to the separation rod 26 at the upper part of the electrolytic water tank 24. The upper part of the electrolyzed water tank 24 is connected to a mixed gas discharge pipe 27. Accordingly, when the electrode plates 21 and 21 are energized and the pump 28 of the water supply pipe 23 is started, the hydrogen gas, oxygen gas and water generated by electrolysis are taken out from the drain pipe 25 as shown by arrow 29 and separated. It isolate | separates with the eaves 26, and it sends to the distributor 11 from the discharge pipe 27 (FIG. 2), and distributes from the distributor 11 to a required location. The jet gas generator 10 is an example, and other structures may be adopted. In short, it can be utilized by generating a jet gas in which hydrogen gas and oxygen gas are mixed. In the figure, 30 is a water supply pipe to the electrolytic water tank 24, 31 is a water level measurement chamber, 32 is a water level gauge, 33 is an electromagnetic valve, 34 is a supply / exhaust pipe, 35 is a communication hole, 36 is an electromagnet, 37 is a spacer, 41 is a spacer 37 mounting pins.

  In the above embodiment, when the electrodes 21 and 21 and the electromagnet 36 are energized and the pump 28 is started, the electrolyzed water flows into the electrolyzer 20 from the electrolyzed water tank 24 and rises as indicated by arrows 38, 39 and 40. While flowing, it is electrolyzed and mixed water containing a large number of hydrogen gas and oxygen gas flows from the drain pipe 25 as indicated by arrow 29 and enters the separation tank 26 for gas-liquid separation.

  In the above, since the hydrogen gas and the oxygen gas rise together with the flowing water as soon as they are decomposed, the electrode surface is always cleaned and the decomposition efficiency is good.

  Further, when the electromagnet is energized, the passing water becomes magnetized water, which can further improve the separation. Furthermore, if an ultrasonic oscillator (similar to that for cleaning) is installed in the electrolytic cell, the decomposition efficiency can be improved by vibration and bubbles on the electrode surface can be removed.

The block diagram of the Example of this invention. Similarly schematic diagram. The expanded sectional view which similarly shows an example of a processing furnace. (A) The schematic diagram of the Example of a zet gas generator similarly, (b) The expansion perspective view which similarly shows an example of an electrode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Processing furnace 2 Zet gas burner 3 Sludge water feed pipe 4 Suction device 5 Dust collector 6 Membrane separator 7 Separation membrane 8 Processing cylinder 9 Chimney 10 Zet gas generator

Claims (9)

  Blowing a jet gas flame from the jet gas burner to the sludge water in the treatment furnace, instantaneously heating it to ultra high temperature to vaporize moisture and low melting point material, the vaporized gas separates the gas and solid with a dust collector, separated gas Is separated into hydrogen gas and non-permeated gas through a separation membrane, the non-permeated gas is processed to release clean gas to the outside, the solid separated by the dust collector is collected, and the unremained untreated gas remains in the processing furnace. A sludge treatment method characterized by recovering sublimation metal and other solid matter.   2. The sludge treatment method according to claim 1, wherein the jet gas is a mixed gas obtained by directly mixing hydrogen gas and oxygen gas generated by electrolyzing water.   The separation membrane is a hydrogen gas permeable membrane, and is stretched so as to bisect the inside of the separator, characterized in that exhaust gas is guided to one side of the permeable membrane and a hydrogen gas outlet is provided to the other side. The sludge treatment method according to claim 1.   Combining processing means for incinerating sludge water with a jet gas flame, dust collection means for exhaust gas generated by the processing means, separation means for processing the gas, gas treatment device and solid matter treatment means A sludge treatment system characterized by that.   5. The sludge treatment system according to claim 4, wherein the treatment means is a combination of a jet gas burner, sludge feed means, and exhaust means in the treatment furnace.   The sludge treatment system according to claim 4, wherein the separation means includes a separation membrane stretched in the tank, exhaust gas is supplied to one side of the separation membrane, and an outlet for hydrogen gas is provided on the other side.   The sludge treatment system according to claim 4, wherein the dust collecting means is a cyclone.   The processing means is provided with a heat-resistant catalyst rooster at the lower part of the processing furnace, a jet gas flame is blown from the lower face of the heat-resistant catalyst rooster to the upper surface of the rooster from the upper part of the processing furnace. The sludge treatment system according to claim 4, further comprising pressure sludge injection means.   The sludge treatment system according to claim 8, wherein the pressurized sludge injection means is pump transfer.

Images