JP2006116375A - Sludge treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sludge treatment apparatus which has high treatment efficiency and prolongs the life of an ultrasonic vibrator by utilizing exhaust heat from an ultrasonic oscillator which is used for driving the ultrasonic vibrator and which exhausts the heat equivalent to about 50% of input electric power from a heat sink to the atmosphere and utilizing natural energy such as solar heat. <P>SOLUTION: The sludge treatment apparatus is provided with: the ultrasonic vibrator 14 arranged in an ultrasonic treatment tank 50; the ultrasonic oscillator 15 for driving the ultrasonic vibrator 14; an exhaust heat transferring medium circulating circuit for circulating an exhaust heat transferring medium; an exhaust heat absorbing heat exchanger 71 for exchanging the exhaust heat from the ultrasonic oscillator 15 to the exhaust heat transferring medium; and an exhaust heat radiating heat exchanger 74 for radiating the exhaust heat transferred to the exhaust heat transferring medium from the ultrasonic oscillator 15 by the exhaust heat absorbing heat exchanger 71. The sludge treatment apparatus is is characterized in that the exhaust heat radiating heat exchanger 74 is arranged in the ultrasonic treatment tank 50. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sludge treatment apparatus that enables a significant reduction in the amount of organic matter in waste liquid generated by waste water treatment.

  Conventional sludge reduction technologies include biological / chemical sludge treatment and physical sludge treatment. Biological / chemical sludge treatment is performed in a short time (about 8 hours) using chemicals. It is suitable for large-capacity sludge treatment, and physical sludge treatment is performed over a long period of time (about 24 hours) using ultrasonic waves, etc., and is suitable for small-capacity sludge treatment (Patent Literature). 1, see Patent Document 2). For example, in the treatment technique disclosed in Patent Document 2, organic sewage is treated in an aerobic biological treatment tank, and solid-liquid separation is performed in a sedimentation tank to obtain treated water and sludge. This sludge is circulated to the aerobic biological treatment tank as return sludge and a part is introduced into the storage tank as surplus sludge. In the storage tank, the sludge is solubilized using ultrasonic waves oscillated from an ultrasonic oscillator, and returned to the aerobic biological treatment tank as solubilized sludge for biodegradation. Is disclosed.

Moreover, in order to raise the sludge solubilization rate especially by ultraviolet irradiation, in addition to the sludge solubilization processing by ultraviolet irradiation, a processing apparatus that uses ultrasonic irradiation processing in combination has been proposed (see Patent Document 3).
JP-A-5-345192 Japanese Patent Laid-Open No. 11-128975 JP 2004-113918 A

  However, the conventional processing apparatus described above has not been proposed to achieve a compact apparatus with a long life of the ultrasonic transducer and low power consumption. In addition, an ultrasonic oscillator for driving an ultrasonic transducer emits about 50% of the input power as heat to the atmosphere by a heat sink, and a device utilizing the exhaust heat of such an ultrasonic oscillator has been proposed. Not. In addition, no device using natural energy such as solar heat has been proposed.

  Therefore, the present invention reduces the power consumption by performing ultrasonic treatment while heating the sludge using exhaust heat from the ultrasonic vibrator and the ultrasonic oscillator or solar heat in order to increase the solubilization rate of the sludge. The purpose is to realize a compact device.

  In addition, by separating foreign matter such as cellulosic fibers such as toilet paper from waste water before being guided to the ultrasonic treatment apparatus, it is possible to improve treatment efficiency and extend the life of the ultrasonic vibrator. An object is to provide an apparatus.

  The sludge treatment apparatus of the present invention according to claim 1 is a sludge treatment apparatus provided with an ultrasonic vibrator in an ultrasonic treatment tank, comprising: an ultrasonic oscillator that drives the ultrasonic vibrator; and an exhaust heat transport medium. The exhaust heat transport medium circulation circuit to be circulated, the exhaust heat exchange means for exchanging the exhaust heat of the ultrasonic oscillator to the exhaust heat transport medium, and the exhaust heat exchange means transferred to the exhaust heat transport medium A waste heat radiating means for radiating the waste heat of the ultrasonic oscillator, and the waste heat radiating means is provided in the ultrasonic treatment tank.

  According to a second aspect of the present invention, in the sludge treatment apparatus according to the first aspect, the waste liquid is introduced from the lower part into the front stage of the ultrasonic treatment tank, and a part of the introduced waste liquid is led out from the upper part. The turbulent sedimentation tank for deriving the other drainage liquid from the lower part, and introducing the drainage liquid from the upper part of the turbulent sedimentation tank, swirling the introduced drainage liquid, deriving the drainage liquid from the upper part, and A swirl flow separation tank to be introduced into the sonication tank is provided.

  According to a third aspect of the present invention, in the sludge treatment apparatus according to the first aspect, the exhaust heat radiating means is provided at the bottom of the ultrasonic treatment tank.

  According to a fourth aspect of the present invention, in the sludge treatment apparatus according to the first aspect, the ultrasonic treatment tank is divided into a first treatment tank and a second treatment tank by a weir, and the first treatment tank The drainage inlet and the ultrasonic vibrator, the second treatment tank is provided with the drainage outlet, and the second treatment tank is provided on both sides of the first treatment tank. The exhaust heat radiating means is arranged on the wall surface of the first treatment tank excluding the weir.

  According to a fifth aspect of the present invention, in the sludge treatment apparatus according to the second aspect, the ultrasonic treatment tank includes a drainage introduction section that introduces a drainage liquid from the swirl flow separation tank, and the drainage introduction section includes the drainage introduction section. The exhaust heat radiating means is provided.

  A sixth aspect of the present invention is the sludge treatment apparatus according to the first aspect, wherein the exhaust heat radiating means is provided in the ultrasonic treatment tank.

  The present invention according to claim 7 is the sludge treatment apparatus according to claim 1, wherein the ultrasonic treatment tank is covered with a heat insulating material.

  The present invention according to claim 8 is the sludge treatment apparatus according to claim 1, wherein a solar heat transport medium circulation circuit for circulating a solar heat transport medium, solar heat absorption means for exchanging solar heat to the solar heat transport medium, and the solar heat Solar heat radiating means for radiating solar heat transferred to the solar heat transport medium by heat absorbing means, and the solar heat radiating means is provided in the ultrasonic treatment tank.

  According to a ninth aspect of the present invention, in the sludge treatment apparatus according to the eighth aspect, the solar heat dissipating means is provided at the bottom of the ultrasonic treatment tank.

  The present invention according to claim 10 is the sludge treatment apparatus according to claim 1, wherein the ultrasonic treatment tank is divided into a first treatment tank and a second treatment tank by a weir, and the first treatment tank is used. The waste water inlet and the ultrasonic vibrator, the second treatment tank is provided with the waste water outlet, the second treatment tank is provided on both sides of the first treatment tank, The solar heat radiating means is arranged on a wall surface of the first treatment tank excluding the weir.

  The eleventh aspect of the present invention is the sludge treatment apparatus according to the second aspect, further comprising a drainage introduction unit that introduces drainage from the swirl flow separation tank to the ultrasonic treatment tank, and the drainage introduction unit includes The solar heat radiating means is provided.

  According to a twelfth aspect of the present invention, in the sludge treatment apparatus according to the second aspect, the ultrasonic treatment tank includes a drainage introduction unit that introduces a drainage liquid from the swirl flow separation tank, and the drainage introduction unit includes the drainage introduction unit. A waste water heat exchanging means is provided for performing heat exchange between the treatment waste liquid flowing out from the ultrasonic treatment tank and the untreated waste liquid flowing into the ultrasonic treatment tank from the swirl flow separation tank. And

  According to the sludge treatment apparatus of the present invention, the treatment efficiency is good and the life of the ultrasonic vibrator can be extended.

  The sludge treatment apparatus according to the first embodiment of the present invention includes an ultrasonic oscillator that drives an ultrasonic vibrator, an exhaust heat transport medium circulation circuit that circulates an exhaust heat transport medium, and exhaust heat from the ultrasonic oscillator. Exhaust heat exchanging means for exchanging heat to the heat transport medium, and exhaust heat dissipating means for dissipating the exhaust heat of the ultrasonic oscillator transferred to the exhaust heat heat transport medium by the exhaust heat exchanging means. It is provided in the sonication tank. According to the present embodiment, the waste heat of the ultrasonic oscillator can be transmitted to the ultrasonic treatment tank by the exhaust heat transport medium, and the solubilization rate by the ultrasonic treatment is increased in order to heat the ultrasonic treatment tank. Can do.

  The sludge treatment apparatus according to the second embodiment of the present invention is a sludge treatment apparatus according to the first embodiment, in which a part of the drained liquid introduced into the previous stage of the ultrasonic treatment tank is led out from the top and other wastewater is discharged. A turbulent flow settling tank that draws liquid from the bottom and a swirl flow separation that introduces drainage from the top of the turbulent settling tank, swirls the introduced drainage, and draws drainage from the top and introduces it to the ultrasonic treatment tank A tank is provided. According to the present embodiment, the waste liquid introduced into the ultrasonic treatment tank is separated and removed in advance by the turbulent precipitation tank and the swirl flow separation tank, so that the treatment in the ultrasonic treatment tank is performed. The ability can be increased and the life of the ultrasonic transducer can be extended.

  According to the third embodiment of the present invention, in the sludge treatment apparatus according to the first embodiment, exhaust heat radiating means is provided at the bottom of the ultrasonic treatment tank. According to the present embodiment, since the exhaust heat radiating means is provided at the bottom of the ultrasonic treatment tank, convection due to heating can be generated in the ultrasonic treatment tank, and ultrasonic waves can be generated by the stirring effect by convection. The inside of the treatment tank can be heated uniformly.

  According to a fourth embodiment of the present invention, in the sludge treatment apparatus according to the first embodiment, the ultrasonic treatment tank is divided into a first treatment tank and a second treatment tank by a weir, and the first treatment is performed. The tank is provided with a drainage inlet and an ultrasonic vibrator, the second treatment tank is provided with a drainage outlet, the second treatment tank is provided on both sides of the first treatment tank, Exhaust heat radiating means is arranged on the wall surface excluding the weir of the treatment tank. According to the present embodiment, by arranging the exhaust heat radiating means on the wall surface excluding the weir of the first processing tank, the contact area between the exhaust heat radiating means and the waste liquid in the first processing tank is increased. In addition, since the first treatment tank can be heated from the lower part to the upper part, the inside of the ultrasonic treatment tank can be uniformly heated.

  According to a fifth embodiment of the present invention, in the sludge treatment apparatus according to the second embodiment, the ultrasonic treatment tank includes a drainage introduction section that introduces drainage liquid from the swirl flow separation tank, and the drainage introduction section includes This is provided with exhaust heat radiating means. According to this embodiment, before drainage flows into the ultrasonic treatment tank, the drainage flowing into the ultrasonic treatment tank is uniformly heated in order to heat the drainage at the drainage introduction section. I can do it.

  The sixth embodiment of the present invention is the sludge treatment apparatus according to the first embodiment, wherein the exhaust heat radiating means is provided in an ultrasonic treatment tank. According to this embodiment, since the drainage in the ultrasonic treatment tank can be directly heated, the drainage in the ultrasonic treatment tank can be efficiently heated.

  In the seventh embodiment of the present invention, in the sludge treatment apparatus according to the first embodiment, the ultrasonic treatment tank is covered with a heat insulating material. According to the present embodiment, the waste liquid in the ultrasonic treatment tank can be efficiently heated by preventing the heat radiation from the ultrasonic treatment tank heated by the exhaust heat radiation means.

  In the sludge treatment apparatus according to the first embodiment, the eighth embodiment of the present invention is a solar heat transport medium circulation circuit that circulates a solar heat transport medium, solar heat absorption means that exchanges heat of solar heat with the solar heat transport medium, Solar heat radiating means for radiating the solar heat transferred to the solar heat transport medium by the solar heat absorbing means, and the solar heat radiating means is provided in the ultrasonic treatment tank. According to the present embodiment, the ultrasonic treatment tank can be efficiently heated by solar heat collected by the solar heat absorption means, and the solubilization rate by ultrasonic treatment can be increased by utilizing natural energy. .

  In the ninth embodiment of the present invention, in the sludge treatment apparatus according to the eighth embodiment, solar heat radiation means is provided at the bottom of the ultrasonic treatment tank. According to the present embodiment, since the exhaust heat radiating means is provided at the bottom of the ultrasonic treatment tank, convection due to heating can be generated in the ultrasonic treatment tank, and ultrasonic waves can be generated by the stirring effect by convection. The inside of the treatment tank can be heated uniformly.

  According to a tenth embodiment of the present invention, in the sludge treatment apparatus according to the first embodiment, the ultrasonic treatment tank is divided into a first treatment tank and a second treatment tank by a weir, and the first treatment is performed. The tank is provided with the drainage inlet and the ultrasonic vibrator, the second treatment tank is provided with the drainage outlet, the second treatment tank is provided on both sides of the first treatment tank, Solar heat radiating means is arranged on the wall surface excluding the weir of the treatment tank. According to the present embodiment, by arranging the exhaust heat radiating means on the wall surface excluding the weir of the first processing tank, the contact area between the exhaust heat radiating means and the waste liquid in the first processing tank is increased. In addition, since the first treatment tank can be heated from the lower part to the upper part, the inside of the ultrasonic treatment tank can be uniformly heated.

  The eleventh embodiment of the present invention is a sludge treatment apparatus according to the second embodiment, further comprising a drainage introduction unit that introduces drainage from the swirl flow separation tank to the ultrasonic treatment tank. Solar heat radiating means is provided. According to this embodiment, before drainage flows into the ultrasonic treatment tank, the drainage flowing into the ultrasonic treatment tank is uniformly heated in order to heat the drainage at the drainage introduction section. be able to.

  The twelfth embodiment of the present invention is a sludge treatment apparatus according to the second embodiment, comprising a drainage introduction part for introducing drainage from the swirl flow separation tank to the ultrasonic treatment tank, and the drainage introduction part. There is provided an inter-drain heat exchange means for exchanging heat between the treated waste liquid flowing out from the ultrasonic treatment tank and the untreated waste liquid flowing into the ultrasonic treatment tank from the swirl flow separation tank. According to the present embodiment, it is possible to use the residual heat of the treatment waste liquid flowing out from the ultrasonic treatment tank for heating the untreated waste liquid flowing into the ultrasonic treatment tank, and efficiently heating the waste liquid. It can be carried out.

  Hereinafter, the sludge treatment apparatus of the Example by this invention is demonstrated with reference to drawings. FIG. 1 is a block diagram showing a sludge treatment apparatus according to one embodiment of the present invention, and FIG. 2 is a waste heat transport that heats waste liquid using exhaust heat or solar heat of an ultrasonic oscillator according to one embodiment of the present invention. It is a block diagram of a medium circulation circuit.

  Drainage and sludge discharged from factories and sewage treatment plants are stored in a drainage storage tank (not shown). When performing some kind of treatment on the drainage or sludge to reuse or reduce the volume, it is important to remove foreign substances contained in the drainage.

  The sludge treatment apparatus according to this embodiment includes a turbulent sedimentation tank 20, a swirl flow separation tank 30, and an ultrasonic treatment tank 50 in the main body case 1. Here, the turbulent sedimentation tank 20 and the swirl flow separation tank 30 constitute a foreign matter separation device.

  The turbulent sedimentation tank 20 has a cylindrical casing 21 and is divided into a plurality of spaces by a plurality of partition plates 22. The partition plate 22 is provided with a round opening, and the diameter of the opening is larger in the lower stage than in the upper stage. For this reason, the foreign substance falling from the upper stage to the lower stage can pass through the lower stage opening, and the foreign substance is discharged from the pipe C to the outside of the turbulent precipitation tank 20. Moreover, it is preferable that the partition plate 22 is provided with an inclined surface directed downward toward the round opening. Due to this inclined surface, the foreign matter settled on each partition plate 22 slides down toward the opening and is discharged from the turbulent sedimentation tank 20. On the other hand, each space divided by the partition plate 22 is smaller in the lower stage than in the upper stage, and the pipe B for discharging the processing liquid is provided near the upper surface of the uppermost space. The drainage liquid flows into the lowermost space from the pipe A and is separated into the waste liquid to be treated and the waste liquid unnecessary for the treatment, and the waste liquid unnecessary for the treatment is returned to the waste liquid storage tank through the pipe C. Next, the waste liquid to be treated flows into the second space located above the lowermost space, and part of the foreign matter is removed by the generated turbulent flow. The liquid to be processed that has passed through the second space flows into a third space (uppermost space) located further above. The third space has a larger volume than the other two spaces, so that the turbulent flow is gentle, and foreign matters are removed by the effects of both turbulent flow and gravity precipitation. The liquid to be processed that has passed through the third space is discharged from the pipe B.

  The swirl flow separation tank 30 includes a cylindrical body portion 31 and a bowl-shaped bottom portion 32. A pipe B through which the liquid to be treated flows into the swirl flow separation tank 30 and a pipe D through which the processing liquid flows out are provided in the trunk portion 31 of the swirl flow separation tank 30 so as to protrude into the swirl flow separation tank 30. The pipe D into which the drainage flows is disposed below the pipe B and above the bottom 32. An elbow is formed at the outlet 33 of the pipe B, and the drainage liquid flows out in the tangential direction of the body portion 31 in the swirling flow separation tank 30 to generate a swirling flow. The introduction port 34 of the pipe D is below the water surface in the swirling flow separation tank 30, and the introduction port 34 is open on the upper side, so that the floating foreign matter floating on the water surface of the swirling flow separation tank 30 is settled on the bottom 32. The treatment liquid can be discharged without introducing the settled foreign matter and the foreign matter separated into the outer periphery of the swirling flow separation tank 30 by the inertial force due to the swirling flow. Moreover, the sedimentary foreign matter settled on the bottom portion 32 can be returned to the drainage storage tank by opening the valve 35. Here, it is preferable to provide an air vent valve on the upper part of the swirl flow separation tank 30 so that the air accumulated in the swirl flow separation tank 30 is discharged to the outside. By providing the air vent valve, no extra pressure is applied to the swirling flow separation tank 30, the strength of the body portion 31 can be kept low, and the swirling flow separation tank 30 can be made compact and low in cost.

  The pipe D is provided with an electric valve 41, a flow meter 42, and a three-way valve (switching means) 43 in this order. The three-way valve 43 is disposed on the downstream side of the electric valve 41 and the flow meter 42, and the three-way valve 43 is provided with a washing water introduction pipe 44. The three-way valve 43 communicates with the swirling flow separation tank 30 and the ultrasonic treatment tank 50 in the use state, but at the time of cleaning, the flow path is switched and the cleaning water is introduced so that the electric valve 41 and the flow meter 42 are connected. Cleaning can be performed. In this embodiment, a turbulent sedimentation tank and a swirl flow separation tank are used as the foreign substance separation apparatus, but the present invention is not particularly limited, and a foreign substance separation apparatus such as a screen or a strainer may be used.

  The ultrasonic treatment tank 50 includes therein a first treatment tank 51 and second treatment tanks 52A and 52B, and the first treatment tank 51 and the second treatment tanks 52A and 52B are respectively a weir 53A. , 53B, and the drainage liquid in the first processing tank 51 is guided to the second processing tanks 52A and 52B through the weirs 53A and 53B. The weirs 53A and 53B are preferably provided across the entire inner wall width between the inner walls of the first processing tank 51 or the second processing tanks 52A and 52B.

  Here, the height of the upper end surface of the weir 53A in one second processing tank 52A and the upper end surface of the weir 53B in the other second processing tank 52B are different. As described above, the height of the upper end surface of the weir 53A in the one second processing tank 52A and the upper end surface of the weir 53B in the other second processing tank 52B are made different, whereby the second processing tank 52A. Even when the water is clogged with sludge or the like, it can be drained to the other second processing tank 52B, so that continuous processing of the drainage can be performed reliably and overflow can be avoided. The upper end surface of the weir 53A in one second processing tank 52A and the upper end surface of the weir 53B in the other second processing tank 52B may be the same height. In this way, the drainage flowing out from the first treatment tank can be thinned by setting the same height.

  The ultrasonic transducer 14 is attached to the surface of the first treatment tank 51 on the side of the weir 53A so that the radiation surface thereof is parallel to the vertical direction, and faces the surface to which the ultrasonic transducer 14 is attached. A drainage inlet 54 is provided on the surface (reflection wall). The inflow port 54 is connected to the pipe D. On the other hand, an outlet 55 for discharging the drainage is provided below the second treatment tanks 52A and 52B. The outlet 55 is connected to the pipe F. Further, a drain port 56 is provided on the bottom surface of the first processing tank 51 to discharge the drained liquid that has settled on the bottom surface of the first processing tank 51. The drainage liquid overflows from above the ultrasonic transducer 14 while maintaining a constant water level by the weir 53A above the attachment surface of the ultrasonic transducer 14.

  Here, the inflow port 54 is provided at a position of 1/3 or less from the lower side in the height direction of the ultrasonic transducer 14, or 1 in height from the bottom surface of the first treatment tank 51 to the weir 53 </ b> A. / 3 or less. The inflow port 54 is preferably attached by forming a protrusion having a length of λ or less in the first processing tank 51. Note that the ultrasonic wave wavelength λ [m] is λ = A / f [m] when the ultrasonic oscillation frequency is f [Hz] and the sound velocity in water is A [m / S].

  UV lamps 58 as ultraviolet irradiation means are attached to the second treatment tanks 52A and 52B located above the weir 53A.

  The UV lamp 58 is a straight tube type or a U-shaped tube type, and is attached so that the central axis thereof is parallel to the weirs 53A and 53B.

  By providing the UV lamp 58 in the second treatment tanks 52A and 52B, the waste liquid is irradiated by the UV lamp 58 after being irradiated with ultrasonic waves. Further, the UV irradiation to the drainage is performed when flowing down the weirs 53 </ b> A and 53 </ b> B and when staying at the outlet 55.

  A lid 60 is provided on the upper part of the ultrasonic treatment tank 50. The lid 60 is provided so as to cover the first processing tank 51 and the second processing tanks 52A and 52B, and is configured such that the cleaning water is supplied from the upper part by the pipe G and the cleaning water is ejected from the lower part. Has been. A plurality of box bodies 61 are formed in the lid body 60, and a plurality of washing water ejection holes 62 are provided in these box bodies 61 on the side walls as well as the lower surface of the box body 61. According to the present embodiment, the cleaning water is guided into the plurality of box bodies 61 and the cleaning water in the box bodies 61 is ejected, so that the water flow can be made uniform and the entire ultrasonic treatment tank 50 can be surely provided. Can be washed.

  The ultrasonic treatment tank 50 in the present embodiment is disposed above the swirl flow separation tank 30, and the discharge port 36 of the drain pipe E of the ultrasonic treatment tank 50 is disposed at the upper center of the swirl flow separation tank 30. The ultrasonic treatment tank 50 and the swirl flow separation tank 30 are arranged so that the drain port 56 and the discharge port 36 are aligned in the vertical direction. The drain pipe E is provided with a valve 57.

  The main body case 1 includes a control panel 2 that supplies power to the ultrasonic treatment tank 50 and the electric valve 41. Further, it is preferable to have a water leakage sensor 3 on the bottom surface of the main body case 1. A plurality of adjusters 4 are provided at the bottom of the main body case 1. This adjuster 4 functions as an inclination adjusting means for changing the position of the upper end surface of the weir 53A in one second processing tank 52A and the position of the upper end surface of the weir 53B in the other second processing tank 52B. Although the present embodiment shows a case where the tilt adjusting means is provided in the main body case 1, the tilt adjusting means may adjust the tilt of the ultrasonic treatment tank 50 itself. Further, the height of the weirs 53A and 53B may be variable.

  With the above configuration, the drainage liquid from the drainage storage tank flows into the turbulent sedimentation tank 20 through the pipe A, and only a necessary amount of the treated wastewater is discharged through the pipe B. The foreign matter removed by the turbulent sedimentation tank 20 and the waste liquid unnecessary for processing are returned to the drainage storage tank by the pipe C. In general, the drainage storage tank needs to be periodically cleaned, and the drainage in the drainage storage tank is discharged by vacuum during cleaning. Therefore, when the foreign matter is returned to the drainage storage tank by the pipe C, the foreign matter can be collectively processed by periodic vacuum, and the cost required for maintenance can be reduced.

  Part of the drained liquid that has flowed into the turbulent sedimentation tank 20 flows into the swirling flow separation tank 30 via the pipe B after the foreign matter has been removed by the turbulent sedimentation tank 20. Then, the waste liquid from which the foreign matters are further removed in the swirling flow separation tank 30 flows out from the swirling flow separation tank 30 via the pipe D. The foreign matter removed by the turbulent sedimentation tank 20 and the swirl flow separation tank 30 and the waste liquid unnecessary for the treatment are returned to the waste liquid storage tank via the pipe C. Here, in the turbulent sedimentation tank 20, the swirl flow separation tank 30 can be made smaller by reducing the flow rate flowing into the swirl flow separation tank 30 with respect to the flow rate returning to the drainage storage tank. Further, by combining the turbulent precipitation tank 20 and the swirl flow separation tank 30, it becomes possible to supply a better processing liquid to the ultrasonic processing tank 50.

  The drainage liquid flowing out from the swirling flow separation tank 30 is guided to the first processing tank 51 from the inlet 54 via the pipe D.

  According to the present embodiment, the waste liquid supplied to the ultrasonic treatment tank 50 is first irradiated with ultrasonic waves, and the flocs of sludge mixed in the waste liquid are dispersed and crushed by the ultrasonic waves. The surface area of the particles exposed to light increases. Further, the drained liquid is stretched thinly by the weirs 53A and 53B, and flows down while being stretched thinly along the surfaces of the weirs 53A and 53B even after passing over the weirs 53A and 53B. Further, the drained liquid flows down toward the outlet 55 in a thinly stretched state. Since the UV lamp 58 is mounted so that the ultraviolet light is applied to the drained liquid that has been stretched thinly, even if the liquid is highly turbid, the entire amount can be irradiated with the ultraviolet light. Thus, since the drainage absorbs UV uniformly, the sludge cells are sufficiently destroyed.

  And the waste liquid from which the sludge cell was fully destroyed is derived | led-out outside the apparatus as a process waste liquid via the piping F from the outflow port 55. FIG.

  Next, an exhaust heat transport medium circulation circuit that heats the waste liquid using the exhaust heat of the ultrasonic oscillator 15 and solar heat will be described with reference to FIG. The exhaust heat of the ultrasonic oscillator 15 is radiated into the air by the heat sink 78 and the cooling fan 79, and is transferred to the exhaust heat transport medium by the exhaust heat absorption heat exchanger 71 installed at the exhaust port of the ultrasonic oscillator 15. The ultrasonic treatment tank 50 is heated by the heat exchanger 74 for exhaust heat radiation installed under the ultrasonic treatment tank 50. The solar heat is transferred to the solar heat transport medium by the solar heat absorption heat exchanger 73, and the ultrasonic treatment tank 50 is heated by the solar heat radiation heat exchanger 75. Here, the heat exchanger 74 for exhaust heat radiation and the heat exchanger 75 for solar heat radiation 75 may be provided in the ultrasonic treatment tank 50 or may be provided on the wall surface of the ultrasonic treatment tank 50. It is desirable to install it below the tank 50. The exhaust heat transport medium and the solar heat transport medium are driven by the heat transport medium drive pump 72. Further, the residual heat of the treatment waste liquid that has flowed out of the ultrasonic treatment tank 50 is used for heating the untreated waste liquid flowing into the ultrasonic treatment tank 50 by the inter-drain heat exchanger 76. Here, for example, water is used as the exhaust heat transport medium and the solar heat transport medium. The ultrasonic treatment tank 50 is preferably provided with a lid and covered with a heat insulating material to reduce heat loss. In this embodiment, both the exhaust heat of the ultrasonic oscillator 15 and solar heat are used, but only the exhaust heat of the ultrasonic oscillator 15 may be used or only solar heat may be used.

  Table 1 shows the effect of the heat retaining means and heating means of the sonication tank 50 on the temperature of the effluent in the sonication tank, and FIG. 3 shows the temperature of the effluent in the sonication tank 50. This shows the influence on the SS solubilization rate.

  Table 1 shows the heat treatment and heating of the ultrasonic treatment tank 50 under the measurement conditions of flow rate 2 [L / min], ultrasonic frequency 20 [kHz], ultrasonic output 600 [W], and ultrasonic treatment tank volume 35 [L]. When there is no temperature, when the ultrasonic treatment tank 50 is covered with a heat insulating material, when the ultrasonic treatment tank 50 is covered with a heat insulating material and the exhaust heat of the ultrasonic oscillator is used, the ultrasonic treatment tank 50 is covered with a heat insulating material. The temperature of the waste liquid in the ultrasonic treatment tank 50 when covering, utilizing the waste heat of the ultrasonic oscillator, and utilizing the solar heat is shown. As shown in the table, even when solar heat is not used, the temperature of the drainage liquid in the sonication tank can be up to 51 ° C. When solar heat is used, the temperature of the drainage liquid in the sonication tank It can be seen that the maximum temperature can be 72 ° C. Moreover, although it cannot read from Table 1, when the density | concentration and viscosity of a drainage liquid were high, the drainage liquid was hard to cool, and compared with the case where a density | concentration and a viscosity were low, the temperature of the drainage liquid was able to be maintained high.

  FIG. 3 shows that the temperature of the effluent in the sonication tank is sludge SS under the measurement conditions of a sonication tank volume of 0.1 [L], an ultrasonic output of 600 [W], and an ultrasonic frequency of 20 [kHz]. This shows the effect on the solubilization rate. As shown in the figure, the SS solubilization rate of sludge increases as the temperature of the effluent increases to 30 ° C., 50 ° C., and 70 ° C., and the SS solubilization rate becomes 50% at a liquid temperature of 70 ° C. You can see that it is over.

  The sludge treatment apparatus according to the present invention can be applied to various effluents discharged from factories, wastewater treatment facilities, and the like.

The block diagram which shows the sludge processing apparatus by one Example of this invention 1 is a configuration diagram of an exhaust heat transport medium circulation circuit that heats waste liquid by using exhaust heat or solar heat of an ultrasonic oscillator according to an embodiment of the present invention. The graph which shows the influence which the temperature of the waste_water | drain in the ultrasonic processing tank by one Example of this invention has on SS solubilization rate

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case 2 Control panel 3 Water leak sensor 4 Adjuster 5 Main body case partition plate 14 Ultrasonic vibrator 15 Ultrasonic oscillator 16 Cooling fan 20 Turbulent sedimentation tank 21 Casing 22 Partition plate 30 Swirling flow separation tank 31 Trunk part 32 Bottom 33 Flow Exit 34 Introduction port 35 Valve 36 Discharge port 41 Electric valve 42 Flow meter 43 Three-way valve 44 Washing water introduction pipe 50 Ultrasonic treatment tank 51 First treatment tank 52A Second treatment tank 52B Second treatment tank 53A weir 53B weir 54 inflow port 55 outflow port 56 drain port 57 valve 58 UV lamp 60 lid body 61 box body 62 ejection hole 71 heat exchanger for exhaust heat absorption 72 heat transport medium drive pump 73 heat exchanger for solar heat absorption 74 heat for heat dissipation Exchanger 75 Heat exchanger for solar heat radiation 76 Inter-drain heat exchanger 78 Heat sink 79 Cooling fan A Piping B Piping C Piping D Piping E Piping F Piping G Piping

Claims (12)

A sludge treatment apparatus provided with an ultrasonic vibrator in an ultrasonic treatment tank, the ultrasonic oscillator for driving the ultrasonic vibrator, an exhaust heat transport medium circulation circuit for circulating an exhaust heat transport medium, and the ultrasonic wave Exhaust heat exchanging means for exchanging the exhaust heat of the oscillator to the exhaust heat transport medium, and exhaust heat dissipating means for dissipating the exhaust heat of the ultrasonic oscillator transferred to the exhaust heat transfer medium by the exhaust heat exchange means The sludge treatment apparatus is characterized in that the waste heat radiating means is provided in the ultrasonic treatment tank. A turbulent sedimentation tank that introduces drainage liquid from the lower part into the previous stage of the ultrasonic treatment tank, derives a part of the introduced drainage liquid from the upper part and derives the other drainage liquid from the lower part, and the turbulent precipitation The swirl flow separation tank is provided, wherein the drainage liquid is introduced from an upper part of the tank, the introduced drainage liquid is swirled, and the drainage liquid is led out from the upper part and introduced into the ultrasonic treatment tank. The sludge treatment apparatus according to 1. 2. The sludge treatment apparatus according to claim 1, wherein the exhaust heat radiating means is provided at the bottom of the ultrasonic treatment tank. The ultrasonic treatment tank is divided into a first treatment tank and a second treatment tank by a weir, and the first treatment tank includes the drainage inlet and an ultrasonic vibrator, and the second treatment The tank is provided with an outlet for the waste liquid, the second processing tank is provided on both sides of the first processing tank, and the exhaust heat dissipating means is provided on the wall surface of the first processing tank excluding the weir. The sludge treatment apparatus according to claim 1, wherein the sludge treatment apparatus is disposed. 3. The sludge according to claim 2, wherein the ultrasonic treatment tank is provided with a drainage introduction section that introduces drainage liquid from the swirl flow separation tank, and the waste heat release means is provided in the drainage introduction section. Processing equipment. The sludge treatment apparatus according to claim 1, wherein the exhaust heat radiating means is provided in the ultrasonic treatment tank. The sludge treatment apparatus according to claim 1, wherein the ultrasonic treatment tank is covered with a heat insulating material. A solar heat transport medium circulation circuit for circulating the solar heat transport medium, solar heat absorption means for exchanging solar heat to the solar heat transport medium, and solar heat heat dissipation means for dissipating solar heat transferred to the solar heat transport medium by the solar heat absorption means. 2. The sludge treatment apparatus according to claim 1, wherein the solar heat radiation means is provided in the ultrasonic treatment tank. The sludge treatment apparatus according to claim 8, wherein the solar heat radiating means is provided at the bottom of the ultrasonic treatment tank. The ultrasonic treatment tank is divided into a first treatment tank and a second treatment tank by a weir, and the first treatment tank includes the drainage inlet and an ultrasonic vibrator, and the second treatment tank. The drainage outlet is provided, the second treatment tank is provided on both sides of the first treatment tank, and the solar heat dissipating means is disposed on the wall surface of the first treatment tank excluding the weir. The sludge treatment apparatus according to claim 1. 3. The sludge treatment according to claim 2, further comprising a drainage introduction unit that introduces drainage from the swirl flow separation tank to the ultrasonic treatment tank, and the solar heat radiation unit is provided in the drainage introduction unit. apparatus. A drainage introduction unit that introduces drainage liquid from the swirl flow separation tank to the ultrasonic treatment tank is provided, and the wastewater introduction part is configured to discharge the treatment wastewater that flows out of the ultrasonic treatment tank and the swirl to the ultrasonic treatment tank. The sludge treatment apparatus according to claim 2, further comprising an inter-drain heat exchange means for exchanging heat with untreated waste liquid flowing in from the flow separation tank.

Images