JP2006015258A - Sludge decomposing treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sludge decomposing treatment apparatus responding to several tons per day of a sludge cake by solving the problem wherein a conventional sludge decomposing treatment apparatus is used in small-scaled facilities or in a home and the treatment capacity thereof is about several ten kg/day or below with respect to the occurrence amount of sludge. <P>SOLUTION: The sludge decomposing treatment apparatus is constituted so that wood chips such as Japan cedar chips are housed in a sludge decomposition tank as a bacteria bed and the sludge cake charged in the sludge decomposition tank is stirred by a plurality of stirring screws arranged in parallel and further moved axially under stirring by the spiral curved surface blades of the stirring screws while kneaded by the planar blades attached to a shaft. This apparatus is equipped with a means for controlling the operation of a plurality of the stirring screws arranged in parallel and the temperature in the sludge decomposition tank and a large amount of the sludge cake is decomposed in a short time. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for decomposing and eliminating a sludge cake of treated wastewater that has settled in a wastewater purification apparatus.

  Conventionally, waste and wastewater generated with storage and dismantling have been treated in a septic tank, and the precipitate was transported to a composting facility for secondary use.

  As a result of BSE countermeasures, there is a danger of contamination of BSE-derived hazardous parts (SRM) into the wastewater, so-called prion contamination, so that circulation by recycling such as composting of precipitated sludge (sludge cake) is also prohibited. To be done.

  For this reason, the sludge cake generated from the waste water purification apparatus had to be incinerated. However, in a large-scale facility such as a meat complex, sludge cake is generated several tons every day, and the incineration disposal cost (20,000 to 50,000 yen per ton) has become a big burden.

  Patent Document 1 proposes a sludge digester that uses fungi of a specific form as a complex microorganism and further decomposes and digests sludge. This device is a device that decomposes sludge by combining a plurality of back-up tanks containing fungus bed materials for the growth of fungi, and decomposition by anaerobic microorganisms and decomposition by aerobic microorganisms. However, the digestion capacity of 1.5 kilograms of sludge was limited in 24 hours, and it was not a facility corresponding to the generated sludge of ton units such as meat complex.

  Further, in Patent Document 2, heating means such as hot water pipes and heating wires are provided inside a cylindrical decomposition treatment tank in which a side wall is formed of a porous metal plate, and a floor material made of wood chips is filled, It is an apparatus that supplies sludge to the upper part of the decomposition tank with a pump and digests and decomposes the sludge impregnated and retained in the flooring material with anaerobic microorganisms or aerobic microorganisms in contact with the atmosphere.

  According to this apparatus, the sludge settled in the sewage treatment apparatus is pumped up on the spot and decomposed into water and carbon dioxide gas, so that it is possible to save sludge collection and transportation, and to reduce sludge disposal costs. However, this invention is also limited to use in homes and small-scale facilities, and the amount of sludge generated is a processing capacity of about several tens of kilograms / day or less.

Japanese Unexamined Patent Publication No. 2000-229299 (pages 2, 3 and 1) JP 2001-47094 A (2nd, 3rd page, FIG. 1)

  This invention is made | formed in view of the said problem, and makes it a subject to provide the sludge decomposition | disassembly apparatus which can digest and decompose the sludge of the large-scale wastewater treatment facility in which the sludge cake of several tons per day generate | occur | produces.

In order to solve the above-mentioned problems, the sludge decomposition treatment apparatus of the present invention is provided with a wood chip as a fungus bed, and an openable and closable sludge inlet provided in the upper part and a treated sludge outlet provided in the lower part. A sludge decomposing apparatus that is connected to a decomposition tank and a deodorizing tank that is connected to an upper space in the decomposition tank and deodorizes and discharges gas generated in the decomposition tank,
In the decomposition tank, while mixing and stirring the introduced sludge cake and the wood chips of the fungus bed, mixing with the wood chips and a plurality of stirring screws arranged in parallel with at least spiral curved blades that stir and move every predetermined time It is characterized by comprising an electric heater for heating the sludge cake to a predetermined temperature, and an automatic control panel for stirring operation and heating temperature.

  Moreover, the said deodorization tank is equipped with the tank of the washing water containing the complex environmental purification microorganism, the washing water circulation pipe provided with a plurality of nozzles for letting the pumped washing water flow down from the upper part of the deodorizing tank, and the washing water flowing down A plurality of porous adsorption plates for absorbing odors are provided.

  The wood chip is a cedar chip.

The agitating screw includes at least one or more helically curved wings and flat wings that are formed when a plurality of rotating shafts and respective rotating shaft cylinder surfaces advance in the axial direction while rotating along a predetermined major axis line. Provided in
By rotating their rotating shafts, the sludge cake thrown in is moved in one direction by the curved blades and the sludge cake and wood chips are mixed and stirred by the flat blades, and the stirring screw is reversed every predetermined time. And a control computer including a moving stirring means for moving the sludge cake on the plane wing in the direction opposite to the above direction.

In addition, rotation drive control means for controlling each drive motor so as to rotate the rotation of the plurality of rotation shafts one by one in the opposite direction,
The introduced sludge cake is automatically moved by spirally curved wings, moved to adjacent flat wings by plane wings, moved in the direction opposite to the moving direction there, and stirring is performed over a wide range. .

According to the sludge decomposition treatment apparatus of the present invention, since the cedar chip having excellent moisture control and air permeability is used as the fungus bed, the activity of microorganisms can be activated, and the sludge can be decomposed into carbon dioxide, water, ammonia, etc. It is a high temperature aerobic fermentation that can be decomposed in a short time,
In addition, because it is equipped with a heating electric heater and a plurality of stirring screws each having spiral wings in parallel, a large amount of sludge is automatically reciprocated every predetermined time and stirred at high temperature aerobic fermentation And the residue volume can be reduced to one-tenth.

  Furthermore, gas without odor can be discharged by washing and absorbing the gas generated by the decomposition with washing water containing the complex environmental purification microorganisms.

  The sludge decomposition processing apparatus of this invention is demonstrated in detail based on figures. FIG. 1 is a view showing a sludge decomposition treatment apparatus 100 of the present invention, where (a) is a plan view and (b) is a side view.

  In the figure, reference numeral 1 denotes a motor that rotates a stirring screw 2 that mixes and stirs the introduced sludge cake and the wood chips of the fungus bed. The agitating screw 2 and the agitating motor 1 are respectively coupled by a shaft coupling 1a. Reference numeral 2c denotes a bearing made of a bearing or the like that supports the stirring screw 2.

  The fungus bed is a bed of high-temperature aerobic fermentation microorganisms that can use cedar chips and decompose sludge into carbon dioxide, water, ammonia, etc. in a short time.

  Reference numerals 10-1, 10-2, 10-3,... Denote decomposition tank units. In the embodiment of FIG. 1A, at least three sets of decomposition tank units 10 are arranged and coupled in parallel.

  FIG. 2 is a perspective view schematically showing the configuration of the decomposition tank unit of the present invention. As shown in FIG. 2, each decomposition tank unit 10 includes at least two stirring screws 2 therein.

  The stirring screw 2 includes spirally curved blades 2a each having a plurality of spirally curved surfaces and flat blades 2b attached in parallel to the axial direction.

  Here, the helically curved surface is a curve formed by a locus when proceeding in the axial direction while rotating along a predetermined length of the radial straight line on the cylindrical surface of the rotating shaft.

  The sludge cake in the vicinity of the spiral curved blade 2a shown in FIG. 2 can move in any of the axial directions depending on the rotation direction of the stirring screw 2.

  In the structure of FIG. 2, the sludge cake moves to the right if the rotation direction of the stirring motor 1 is clockwise. If this rotation is continued, the sludge cake gradually moves to the flat blade 2b and is stirred.

  Conversely, if the rotation direction of the stirring motor 1 is reversed in the above state, the sludge cake moves to the left.

  If the forward / reverse rotation of the agitating motor 1 is repeated every predetermined time, the sludge cake moves left and right repeatedly, and the wood chips and sludge cake, which are fungus beds, are mixed with the agitation in the flat blade 2b. Become.

  Reference numeral 3 denotes a heater for keeping the inside of the decomposition tank 10 at a constant temperature in order to further increase the growth of fungi in the decomposition tank 10.

  In addition, the code | symbol 4 shows the upper cover of a decomposition tank, 11 shows the sludge inlet, and 11a shows the door. Reference numeral 5 denotes a base of the decomposition tank 10, 6 denotes a support column or angle of the decomposition tank 10, and 7 denotes a side wall plate of a metal plate that closes the decomposition tank constructed by those angles 6. The perspective view of FIG. 2 shows that the wall of the metal plate 7 is removed from the drawing so that the stirring screw 2 can be seen.

  Reference numeral 12 denotes an outlet for taking out the decomposed sludge cake, reference numeral 14 denotes a deodorizing exhaust port for the gas generated in the decomposition process, and reference numeral 13 denotes an air supply port for reusing the air or the deodorized gas. Show.

  The display range of the one-dot chain line in FIG. 1A indicates the plane of the stirring range of each stirring screw 2.

  As shown in the side view of the sludge decomposition treatment apparatus 100 in FIG. 1B, a plurality of decomposition tanks 10 and their agitating motors 1 are arranged in the upper stage, and the gas generated in each decomposition tank 10 in the lower stage. A deodorizing tank 20 for deodorizing the odor of the gas, a discharge port 12 and a discharge screw 112a for the sludge cake residue after the decomposition treatment from each decomposition tank 10, a motor 113 for discharging, and a control computer 150 for controlling them. It has been.

  FIG. 3 is a schematic view showing the configuration of the deodorization tank of the present invention. In FIG. 3, 114 is an exhaust inflow pipe into which the gas generated in the decomposition tank 10 flows.

  21 is a water tank, 22 is a porous absorbent, and 23 is a shower nozzle. In this embodiment, two layers of the porous absorbent material 22 are provided.

  Reference numeral 25 denotes a water circulation pump, which supplies water from the water tank 21 to the shower nozzles 23 and sprays water from these nozzles.

  The cleaning water in the water tank 21 is mixed with an appropriate amount of environmental purification microorganisms. As the environmental purification microorganism, for example, “Ehime AI-1” developed by Ehime Industrial Technology Center by issuing and culturing yeast, lactic acid bacteria and natto bacteria with molasses is desirable. The odor of the gas generated in the decomposition tank 10 rising from below is deodorized by spraying water containing the environmental purification microorganisms.

  The deodorized gas exits from the upper exhaust port 14. The deodorized gas may be returned to the decomposition tank 10 again. At the same time, new air may be supplied to the decomposition tank 10.

  In the embodiment shown in FIG. 1B, the deodorization tank 20 allows gas to flow through the exhaust inflow pipe 114, performs deodorization processing, and decomposes the gas deodorized by the exhaust motor 125 through the deodorization exhaust pipe 124 together with air. It is returned to the tank 10.

  The deodorization exhaust pipe 124 extends to the depth of the decomposition tank 10, and the deodorized air is mixed with the decomposed gas and sent to the deodorization tank via the exhaust inflow pipe 114.

  In FIG. 1 (b), the discharge screw 112 a receives the processed sludge cake residue discharged from the discharge port 12 of each decomposition tank 10 and rotates the sludge cake by rotating the sludge cake motor 113. This is a mechanism for moving the residue to the right and dropping it from the discharge port 112.

  Reference numeral 150 denotes a control computer for automating the sludge decomposition process.

  FIG. 4 is a schematic diagram showing the configuration of the control computer of the present invention. In the configuration of FIG. 4, the central processing unit CPU includes at least a storage device such as a display unit, an input device, and an HDD via a bus.

  The control computer 150 reads the temperature data from the thermal sensor 3a provided for each decomposition tank unit 10 into the CPU through the bus via the A / D converter, compares it with a preset set temperature, Corresponding to the height, heater control means is provided for turning on / off the DC voltage from the electronically controlled DC power source to the heater 3 of the decomposition tank via the bus and I / F or changing the DC voltage value.

  In addition, the CPU commands the output of a predetermined voltage to the electronic control DC power source via the bus and the I / F in order to discharge the sludge cake processed after the elapse of stirring for a predetermined time from the discharge port 112, The sludge discharge motor 113 is driven by the output, the discharge screw 112a is rotated, and sludge discharge means for discharging the sludge residue is provided.

  Further, in order to deodorize the gas generated in each decomposition tank 10, the CPU instructs a voltage output for driving the exhaust motor 125 to the electronically controlled DC power source via a bus and an I / F every predetermined time. The exhaust motor 125 is driven by the output, and the gas generated in each decomposition tank 10 is taken into the deodorization tank 20 via the exhaust inflow pipe 114 to deodorize the gas, and together with the air, through the deodorization exhaust pipe 124. Exhaust motor driving means for sending back to each decomposition tank 10 is provided.

  Next, the control computer 150 commands the agitating motor electronic control DC power supply via the bus and the I / F to the right and left sides of the decomposition tanks 10-1, 10-2, 10-3,. The stirring motor 1 is caused to output a voltage value having a predetermined polarity.

There are the following two means for driving each stirring motor 1 to rotate the stirring screw.
(A) Moving stirring means (automatic reciprocating stirring means)
(B) Rotation drive control means

  (A) When the two stirring screws 2 for each cracking tank unit 10 are simultaneously rotated in the same direction, (B) the rotational drive control means is for two stirrings for each cracking tank unit 10. In this case, the screw 2 is rotated in the opposite direction.

  First, the case of (A) will be described. In this moving stirring means, the CPU instructs the DC power supply for the stirring motor to rotate the stirring screw 2 for each decomposition tank in the same direction and move the sludge cake put on the spirally curved blade 2a to the right side. .

  The sludge cake is kneaded with the cedar chips in the fungus bed while moving on the right plane wing 2b and accumulating there.

  In this state, after elapse of a predetermined time, the CPU instructs the stirring motor electronic control DC power source via the bus and the I / F to invert the polarity of the DC voltage. Thereby, the rotation of each stirring motor 1 is reversed and rotated.

  If it rotates in reverse, the stirring screw 2 will also reverse and the sludge cake accumulated on the flat blade 2b will start moving to the left side.

  If the above repetition is performed every predetermined time, the sludge cake is kneaded with the cedar chips of the fungus bed, and the right movement and the left movement are repeated every predetermined time. During this time, the heater 3 is controlled by the temperature sensor 3a. By maintaining the inside of the decomposition tank at a temperature suitable for the growth of bacteria, the sludge cake is decomposed at a high speed. (Moving stirring means, automatic reciprocating stirring means)

  Next, (B) rotational drive control means will be described. In the rotation drive control means, since the CPU sends a command to the electronic control DC power supply so that the two adjacent stirring screws 2 rotate in the opposite direction, the sludge cake on the side of one stirring screw is on the right side and the other stirring screw is on the other side. The sludge cake on the screw side moves to the left side, and at the end thereof, it moves to the adjacent spiral curved blade 2a or flat blade 2b, and eventually the sludge cake in the decomposition tank unit 10 is decomposed along the stirring screw 2 It will rotate so that it goes in order.

  In this state, if the rotation directions of the two adjacent agitating screws 2 are rotated in the opposite directions, the sludge cake flow is rotated in a direction opposite to the direction so as to pass through the decomposition tank. It will be. (Rotation drive control means)

  The rotational drive control means (B) can knead the sludge cake more uniformly than the means (A).

  Next, the control setting of the control computer 150 of the sludge decomposition processing apparatus necessary for the above operation will be described.

  In the initial state where the control computer 150 is reset, an operation condition setting screen and an operation start button are displayed at least on the display unit of the control computer 150.

  Prior to the start of operation, the designation selection of (A) or (B) is input as the drive method of the stirring screw as the operation condition. Next, specify the repetition time and the number of repetitions.

  Next, various control conditions such as designation of the maintenance temperature by the heater 3, the operation time interval of the exhaust motor 125, the time for starting the sludge discharge motor 113, the standing time after the completion of the number of repetitions are set and input. If a default value is input in advance, it is not necessary to set it every time.

  The drive time of the sludge discharge motor 113 for sludge discharge may be set by automatically calculating the time from the input time from the input door 11a of the sludge input port or the start time of the control computer.

  The data write setting as described above is performed in advance, and the operating condition setting of the sludge decomposition processing apparatus 100 is performed.

  By pressing the start button after setting the above operating conditions, the sludge cake thrown in by the control means is automatically processed and discharged from the discharge port.

  The control of the water circulation pump 25 of the deodorizing tank 20 can also be performed from the control computer 150. In addition, replenishment of the water tank can be automated.

FIG. 1 is a view showing a sludge decomposition treatment apparatus 100 of the present invention, where (a) is a plan view and (b) is a side view. It is a perspective view which shows typically the structure of the decomposition tank unit of this invention. It is a schematic diagram which shows the structure of the deodorizing tank of this invention. It is a schematic diagram which shows the structure of the computer for control of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stirring motor 1a Shaft coupling 2 Stirring screw 2a Helical curved blade 2b Planar blade 2c Bearing 3 Heater 3a Thermal sensor 4 Upper lid 5 units 6 Support angle 7 Side wall plate 10 Decomposition tank (unit)
10-1, 10-2, 10-3 ... 1st, 2nd, 3rd decomposition tank unit 11 Sludge input port 11a Input door 12 Discharge port 13 Air supply port 14 Exhaust port 20 Deodorization tank 21 Water tank 22 Porous absorbent material (multi-layer)
DESCRIPTION OF SYMBOLS 23 Shower nozzle 24 Deodorization exhaust pipe 25 Water circulation pump 100 Sludge decomposition processing apparatus 112 Discharge port 112a Discharge screw 113 Sludge discharge motor 124 Deodorization exhaust pipe 125 Exhaust motor 150 Control computer

Claims (5)

A wood chip is stored as a fungus bed, and is connected to a decomposition tank provided with an openable / closable sludge inlet and a treated sludge outlet provided in the upper part, and an upper space in the decomposition tank, A deodorization tank configured to deodorize and discharge the gas generated in the decomposition tank,
In the decomposition tank, while mixing and stirring the introduced sludge cake and the fungal bed wood chips, a plurality of parallelly arranged stirring screws provided at least with spiral curved blades that reciprocate every predetermined time, and mixed with the wood chips A sludge decomposition treatment apparatus comprising an electric heater for heating a sludge cake to a predetermined temperature, and an automatic control panel for stirring operation and heating temperature.   The deodorization tank includes a tank of cleaning water containing complex environmental purification microorganisms. The cleaning water circulation pipe includes a plurality of nozzles for flowing down the pumped cleaning water from the upper part of the deodorizing tank, and the cleaning water flowing down has an odor. The sludge decomposition processing apparatus according to claim 1, comprising a plurality of stages of porous adsorption plates for absorption.   The sludge decomposition processing apparatus according to claim 1, wherein the wood chip is a cedar chip. The agitating screw has a plurality of rotating shafts and at least one or more spirally curved wings and flat wings formed on the respective rotating shaft cylinder surfaces while moving along a predetermined major axis straight line in the axial direction. And
By rotating their rotating shafts, the sludge cake thrown in is moved in one direction by the curved blades and the sludge cake and wood chips are mixed and stirred by the flat blades, and the stirring screw is reversed every predetermined time. The sludge decomposition processing apparatus according to claim 1, further comprising a control computer provided with a moving stirring means for moving the sludge cake on the plane wing in a direction opposite to the direction. The control computer further includes rotation drive control means for controlling the respective drive motors so as to rotate the rotation directions of the plurality of rotation shafts in the opposite direction.
The introduced sludge cake is automatically moved by spirally curved wings, moved to adjacent flat wings by plane wings, moved in the direction opposite to the moving direction there, and stirring is performed over a wide range. The sludge decomposition processing apparatus of Claim 4.

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