JPH07290286A - Dehydrating device for pelletized sludge - Google Patents

Abstract

PURPOSE:To provide a device for rapidly dehydrating and volumetrically reducing pelletized sludge formed to a gelatinou form with high efficiency at a low cost by capturing the fine particle components in the sludge. CONSTITUTION:This dehydrating device has a cylindrical compression chamber 1 which is formed with a beginning end aperture 1a as an introducing port of a compression head 5 and is freely openably and closably installed with a gate 2 for solid-component discharge in a terminal end aperture 1b. A screen 1c for liquid-component extraction arranged with many wires apart specified small spacings is installed to the cylindrical wall of this chamber, The compression head 5 formed to be introduced from the beginning end aperture 1a of the cylindrical compression chamber 1 and to be fitted at its outer peripheral surface to the inner peripheral surface of the screen 1 is fixed to the leading and extending part of a cylinder rod 7 so that the pelletized sludge supply port 9 opened at the well surface in the beginning end direction of the compression 1 at the time of retreating of the compression head 5 is closed by the outer peripheral surface of the compression head 5 at the time of extending of this head.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a dewatering device for granulated sludge,
More specifically, after mixing the core liquid with wastewater sludge from construction / civil engineering sites, sludge generated by treatment of industrial wastewater or domestic wastewater, sewage sludge from sewage treatment plants, or livestock excrement sludge from poultry farms, etc. The present invention relates to a dewatering device for dewatering and reducing the volume of granulated sludge, which is formed in a gel by being successively immersed in a coagulating liquid.

[0002]

2. Description of the Related Art As a method for dehydrating and reducing the volume of sludge, conventionally, sludge is precipitated by a coagulant, solid-liquid separation is performed to remove a part of water, and the solid content having a low water content is further dehydrated. After that, it is finished into an appropriately sized clod. However, sludge using a conventional flocculant aggregates fine particles only and does not form nuclei. Therefore, the flocculation is easily destroyed when an external force is applied. Therefore, a filter press as shown in FIG. 6 is often used for the dehydration volume reduction.

However, in this filter press, the manufacturing cost increases, and the installation cost and the installation area also increase.
In addition, the dehydration process is a batch process, which requires a long time and has a low work efficiency. Moreover, it is necessary to drive sludge with high pressure, and the injection pump and the check valve are often damaged, resulting in high repair costs. In addition, the filter cloth is heavily clogged and often cannot be dehydrated, which requires a lot of labor and time for cleaning, and consumes cleaning water to increase running costs. Furthermore, there is a serious defect that it is impossible to capture and recover the ultrafine particles that have passed through the filter cloth,
The problem of environmental pollution caused by the diffusion of fine particles cannot be overlooked.

[0004]

An object of the present invention is to provide a dehydrator of the present invention in a form which does not cause secondary pollution by capturing fine particle components in sludge reliably at low cost without the need for the conventional settling / filtering work. It is intended to dehydrate and reduce the volume of gelled sludge that is produced in a gel form, can be manufactured in a compact structure with a small size and at a low cost, does not require a large installation area, and does not cause clogging, resulting in quick and highly efficient dehydration. An object of the present invention is to provide a dehydrator which can be treated and does not require washing water and has a low running cost.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The dewatering apparatus for granulated sludge according to the present invention is for dehydrating and reducing the volume of granulated sludge formed into a gel by mixing sludge with a core liquid and then successively dipping it in a coagulating liquid. Of the dehydration device, wherein the starting end opening is used as an inlet of the compression head described later, and the end opening has a cylindrical compression chamber in which a solids discharge gate is attached so as to be openable and closable, and a large number of cylinder wall surfaces are provided. A liquid extraction screen, in which the wires are arranged with a certain small gap, is attached and is introduced from the opening of the starting end of the cylindrical pressure receiving chamber so that the outer peripheral surface fits with the inner peripheral surface of the compression chamber. Fix the compressed head on the guide part of the cylinder rod,
The granulated sludge supply port, which is formed so as to be opened on the wall surface in the starting end direction of the compression chamber when the compression head is retracted, is configured to be closed by the outer peripheral surface when the compression head is fed.

[0006]

Embodiments will be described below with reference to the drawings of the embodiments.

Reference numeral 1 is a cylindrical compression chamber, and 1c is a liquid extraction screen attached to the cylindrical wall of the compression chamber 1, and comprises a large number of wires each having an acute isosceles triangle cross section as shown in FIG. The vertices P are arranged in parallel with a certain small gap g ... G so as to face outward, and their openings are set to be about 0.2 to 0.5 mm inward. , The upper surface of the wire is formed into an inclined surface t ... T that has a downward slope from the inner peripheral side to the outer peripheral side of the compression chamber 1, or the inner peripheral surface has a small gap and the outer peripheral surface expands to a wide gap. Is formed in the specified manner. 1 and 2,
Reference numeral 2 denotes a solid component discharge gate provided orthogonally to the terminal end opening 1b of the cylindrical compression chamber 1, which is fixed to a guide portion of a cylinder rod 4 fed from the opening / closing cylinder 3 and is opened / closed. Reference numeral 5 denotes a compression head which is introduced from the starting end opening 1a of the cylindrical compression chamber 1 and whose outer peripheral surface is fitted to the inner peripheral surface of the compression chamber 1. The cylinder head 7 is fed from the compression cylinder 6. It is driven by being fixed on the guide part of the. Reference numeral 9 is a granulation sludge supply port formed in the wall surface of the tubular compression chamber 1 in the starting end direction, and 10 is a hopper for temporarily storing the granulation sludge. When the compression head 5 is retracted, the granulation sludge supply port 9 is opened and the hopper 10 and the cylindrical compression chamber 1 are opened.
The interior of the compression head 5 is electrically connected, but when the compression head 5 is delivered, the outer peripheral surface of the compression head 5 closes the granulated sludge supply port 9 to interrupt the electrical connection between the hopper 10 and the cylindrical compression chamber 1. There is.

The granulated sludge sent to the hopper 10 is produced by the flow shown in FIG. 5, and there are two methods for mixing the core liquid and the coagulating liquid. First, from the first method, the mixing means 1 for mixing sludge from construction / civil engineering drainage, etc.
1 and an aqueous solution of an alkali salt or ammonium salt of alginic acid serving as a core liquid is supplied to the mixing means 11 and mixed with the above sludge to form a homogeneous sludge, which is a coagulating liquid containing a polyvalent metal other than magnesium. By successively dipping the homogenized sludge into the supplied coagulation tank 12 little by little, polyvalent metal ions are replaced with alkali or ammonium alginate to cause gelation,
The fine particle component in the sludge is captured in the gel and aggregates in a small lump form. When the sludge is immersed in the coagulation tank 12, the sludge droplet supply mechanism 13 is arranged to disperse the sludge in the form of droplets of a constant size. Is used, sludge particles having a predetermined diameter unified in a spherical shape or a string shape having a diameter of 5 to 7 mm are generated. Next, the second method will be described. By supplying sludge such as construction / civil drainage to the mixing means 11, and supplying core liquid containing a polyvalent metal other than magnesium to the mixing means 11 and mixing with the above sludge. The homogenized sludge is successively dipped little by little into the coagulation tank 12 into which the aqueous solution of the alkali salt or ammonium salt of alginic acid serving as the coagulation liquid is supplied, so that the polyvalent metal ions are alginate. The gelation occurs by substituting with alkali or ammonium of the sludge, and the fine particle component in the sludge is captured in the gel and aggregates into a small lump. When the sludge is immersed in the coagulation tank 12, the sludge droplet supply mechanism 13 As in the case of the first method described above, the sludge particles having a uniform predetermined diameter are generated by using the. The sludge particles thus produced are taken out batchwise or continuously from the inside of the coagulation tank 12 by the granule taking-out means, and if necessary, the coagulation liquid is removed by the solid-liquid separating means 14 to obtain granulated sludge. After that, it is sent to the hopper 10 of the dehydrator of the present invention.

In the state of FIG. 1 in which the compression head 5 is fed out and the outer peripheral surface of the granulation sludge supply port 9 is closed, the sent granulation sludge is temporarily stored in the hopper 10. When the solids discharge gate 2 is closed to close the terminal opening 1b of the cylindrical compression chamber and the compression head 5 is retracted to open the granulation sludge supply port 9, the hopper 10 is opened. The granulated sludge temporarily stored therein flows into the cylindrical compression chamber 1. Then, the granulation sludge is squeezed by the feeding operation of the compression head 5, the water content of the sludge trapped inside is squeezed out from the gel-like outer skin, and is extracted through the small gaps g ... In addition, the gel-like coating formed by the above-mentioned method is tough and has a large number of fine holes h ... As shown in FIG.
.. h is formed, so that the water content inside is not destroyed by the pressing, and the water content inside the h.
Since the outer skin is not destroyed in this way, only the liquid component is extracted through the small gaps g ... G without causing clogging. Further, even if part of the granulated sludge bites into the small gaps g ... G, the bited state can be easily eliminated by pushing back in the direction of the arrow shown in FIG. When the solid content discharge gate 2 is opened again to bring the terminal opening 1b of the cylindrical compression chamber to the open state shown in FIG. 1, the solid content volume reduced by dehydration is discharged to the outside. Since the granulated sludge supply port 9 is blocked by the outer peripheral surface of the compression head 5, the granulated sludge newly sent into the hopper 10 is temporarily stored in the hopper 10 as it is. When the solid content discharge is completed and the solid content discharge gate 2 is closed, the terminal opening 1b of the cylindrical compression chamber is closed, and the compression head 5 is retracted to open the granulation sludge supply port 9 in FIG. Once in the state, the new granulated sludge stored in the hopper 10 flows into the cylindrical compression chamber 1. By repeating the above-mentioned operation by a method such as timer control, the dehydration work of the granulated sludge is intermittently performed. However, continuous dehydration can be achieved by controlling the time difference between the two dehydrators. The work will be carried out. Since the outer skin of the granulated sludge dehydrated and reduced in volume is not destroyed, for example, the water-insoluble granular soil is burned by a heat treatment device, or the dry distillation carbonization is performed by a dry distillation carbonization furnace. The transition to the next process will be carried out smoothly. It should be noted that although the drawings of the embodiments show a horizontal configuration, the present invention can of course be implemented in an apparatus having a vertical configuration.

[0010]

EFFECTS OF THE INVENTION According to the dehydrator of the present invention for granulated sludge, it is possible to capture fine particle components in sludge reliably at a low cost without the need for the conventional settling / filtration work. It dehydrates and reduces the volume of granulated sludge formed in a gel form that does not cause the next pollution.It has a simple structure, can be manufactured at a small size and at low cost, does not require a large installation area, and does not cause clogging. A quick and highly efficient dehydration process can be performed, the running cost can be reduced without the need for washing water, and the volume can be dehydrated and reduced without destroying the outer shell of the granulated sludge, so to the next step Has the advantage that it can be transferred smoothly.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of essential parts of a dehydrator of the present invention, showing a state in which a granulated sludge supply port is closed and a solid content discharge gate is opened.

FIG. 2 is a cross-sectional plan view of the essential parts of the dehydrator of the present invention, showing a state in which the solid content discharge gate is closed and the granulated sludge supply port is opened.

FIG. 3 is an enlarged view of a vertical cross section of a main part of a liquid extraction screen in the dehydrator of the present invention, showing an example in which the side surface of the cylindrical compression chamber is configured as a screen surface.

FIG. 4 is an enlarged view of a longitudinal cross section of a main part of a liquid extraction screen in the dehydrator of the present invention, showing an example in which the lower surface of the cylindrical compression chamber is configured as a screen surface.

FIG. 5 is a flowchart of generation of granulated sludge to be treated by the dehydrator of the present invention.

FIG. 6 is a machine explanatory view of a filter press that has been frequently used for dewatering sludge.

[Explanation of symbols]

 1 Cylindrical compression chamber 1a Start opening 1b End opening 1c Liquid extraction screen 2 Solid discharge gate 5 Compression head 7 Cylinder rod 9 Granulation sludge supply port g Small gap

Front page continuation (72) Inventor Takeyuki Nishimura 4-16-40 Tsurumi Co., Tsurumi-ku, Osaka-shi, Osaka (72) Inventor Nobuyuki Tsubouchi 8-28 Uematsu-cho, Yao-shi, Osaka Toyo Screen Industry Co., Ltd.

Claims (1)

[Claims] A dewatering device for dehydrating and reducing the volume of granulated sludge formed in a gel form by mixing sludge with core liquid and then successively immersing it in a coagulating liquid. The end opening has a cylindrical compression chamber with a solids discharge gate that can be opened and closed. A large number of wires are arranged on the wall of the cylinder for extraction of liquid. A compression head having a screen attached thereto, which is introduced from the opening of the starting end of the cylindrical compression chamber and whose outer peripheral surface is fitted to the inner peripheral surface of the compression chamber, is fixed to the guide portion of the cylinder rod, Dewatering of granulated sludge, characterized in that the granulated sludge supply port, which is opened in the wall of the compression chamber in the starting end direction when closed, is closed by the outer peripheral surface of the compression head when it is fed out. apparatus.