JPH06134497A - Method and apparatus for two-step slurry treatment - Google Patents

Abstract

PURPOSE:To surely treat slurry of construction waste mud or slurry containing activated sludge and having high water content ratio and effectively reutilize the obtained solid substance as a filter medium, a surfactant, a soil reforming agent, a construction material, etc. CONSTITUTION:An elastic film 10 in a casing of a press-sending apparatus is expanded and contracted by a functional oil and the slurry for which primary dehydration is carried out by a centrifugal apparatus 22 is made in sludge state by a screw type feeder and mixer 20 and supplied to a sludge chamber 12. The dispersed bubbles are removed by degasing in a degasing chamber 14 and the resulting sludge as sludge with low water content ratio and no water dropping is supplied to a filter press 28 to obtain a chocolate-type cake 30, the chocolate-type cake 30 is dry distillated in an autoclave 31, a dry distillation gas is circulated to remove water and dehydrate the gas and deodorization is carried out, and a gas after dehydration and deodorization is fired by a burner to use as a heat source for the autoclave 31 and the solid material which becomes like coke is re-used effectively.

Description

Detailed Description of the Invention

[0001]

[Industrial application] The disclosed technology is a system for effective solid-liquid separation of slurries and sludges discharged from factory waste liquid, construction waste materials, etc., and effective reuse of solid-liquid separated chocolate-like cake. Belong to the technical field.

[0002]

2. Description of the Related Art As is well known, the rise of industry greatly contributes to the improvement of civic life and the development of culture, but recently, the development of industry has caused a large-scale pollution problem and polluted the earth's environment. Inviting them, industrial development cannot ignore them, and even if they do not survive without harmony with them, pollution prevention industries and environmentally conscious industries are becoming new industries. It is getting more and more attention.

Thus, in various chemical industries, pharmaceutical industries, food industries, chemical industries, agricultural and marine industries, construction industries, etc., not only effective treatment of industrial waste liquids and industrial wastes discharged therefrom, but also active As a result, there is a growing demand for effective reuse. Especially, the volume reduction of sludge generated from slurries of factory waste liquid, construction waste liquid, etc. and the ease of incineration, burial, etc. have simply been negative. What was supposed to be a waste treatment was to develop a technology that enables effective reuse of construction materials, deodorants, filters, surfactants, etc. by adding and mixing coagulants, etc. Research has been improved.

In addition, as a means for effectively reusing sludge, which is obtained by first performing solid-liquid separation of the slurry, by finally performing solid-liquid separation to reduce the volume to a chocolate-like cake, incinerating, burying, and further solidifying. Filter presses are widely used in systems that can achieve extremely high solid-liquid separation efficiencies and are playing an active role.

[0005]

However, such a filter press, which basically has extremely high solid-liquid separation efficiency, is more effective than various solid-liquid separation devices, but has a high water content in the slurry supplied. In this case, in the solid-liquid separation process of sludge, even if a so-called water passage in the solid particle gap is formed and dewatering is performed from a predetermined area outside the water passage, the water passage and the vicinity thereof Due to the high water content, there is the drawback that a chocolate-like cake cannot be obtained in the solid-liquid separation area between the filter frames. Also, since the cake has a lot of water, the adhesion of the cake to the filter cloth is high. However, there is a disadvantage that the cake cannot be peeled off and removed smoothly, and as a result, the operation as designed of the filter press is hindered.

[0006] Even if solid-liquid separation can be performed in a random manner, there is a minus point that a reuse material cannot be obtained from the cake obtained by the solid-liquid separation.

[0007]

OBJECT OF THE INVENTION The object of the invention of this application is to solve the problems in the slurry treatment centering on the filter press used in the solid-liquid separation system for the pollution prevention and environmental harmony accompanying the development of the industry based on the above-mentioned prior art. As a technical issue to be solved, primary dehydration was performed in advance in a semi-dehydrated state for solid-liquid separation of slurry into sludge so that the function of the filter press could be fully exerted, and then the primary dehydration was performed by high-pressure pumping. The sludge is pumped to the filter press to ensure that it is secondarily dehydrated into a chocolate cake.
Furthermore, by the dry distillation treatment of the next stage, it is possible to use the waste material of the activated sludge for recycling, and an excellent two-stage type slurry treatment method that is useful in the field of pollution prevention in various industries, and environmental harmony technology utilization field, and An object of the present invention is to provide a slurry processing device used directly in the method.

[0008]

In order to solve the above-mentioned problems, the construction of the invention of this application, which is based on the above-mentioned claims, is intended to solve the above-mentioned problems.
Add a predetermined coagulant to the slurry such as activated sludge,
A water content of 40 to 60%, further 75 to 90%, and the like in a semi-dehydrated state to a kneading state by a mixer, press this into the elastic membrane of the high-pressure pumping device, and then apply a negative pressure to the elastic membrane. , Repeatedly decompressed by positive pressure, etc., and discharged and degassed in order to prevent the formation of pits in the water passage that are formed in the sludge in the expansion and contraction process and become a hindering condition in solid-liquid separation by a general filter press. Or, the intake air is degassed,
The water content is reduced, and the mixture is pressure-fed to a filter press at a pressure of 30 kgf / cm ² , or the slurry such as activated sludge is once semi-dehydrated to a kneading state in the same manner as above,
It is pressure-fed to a filter press to perform solid-liquid separation under high pressure to form a chocolate-like cake with a thickness of about 17 to 20 mm,
The resulting chocolate-like cake is further supplied to an autoclave, vacuum-heated, and subjected to dry distillation, and the exhaust gas is circulated for cooling, dehydration, deodorization, burning with a burner, and finally filtering and deodorizing. It is a technical means that can be effectively reused as a useful material such as an agent, a surfactant, a fuel charcoal, or a solidifying material for construction.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the invention of this application with reference to the drawings.

The illustrated embodiment is an embodiment of a sludge treatment system for effectively reusing activated sludge generated from construction waste materials or the like into a filtering material, a deodorant, or a construction material, and shows a hard part. The solid-liquid separation plant 1 shown in FIG. 2 and the dry distillation plant 2 shown in the latter part of FIG. 2 are arranged next to each other.

As shown in FIG. 1, the solid-liquid separation plant 1 has an oil suction / discharge port 4 for the working fluid passing through a check valve 5 and a hydraulic pressure through a switching valve 6 on one side of a drum type casing 3. Connected to an oil tank 8 with a pump 7,
Further, a spindle-type wire mesh support 9 is provided inside the casing 3, and an expandable / contractible spindle-type elastic film body 10 made of rubber or the like is provided inside the support. The elastic film body 10 is provided in the casing 3 together with the base portion of the above, and the outside of the elastic film body 10 is divided into a working fluid chamber 11 and an inside slurry chamber 12.
An exhaust chamber 14 is provided above the base of the casing 3 in the opening 2 via an electromagnetic opening / closing valve 13.
A filter 16 is connected via 5.

A sludge supply port 17 is provided at the rear portion of the casing 3, and a screw type feeder / mixer 20 is connected to a drive motor 19 via an electromagnetic opening / closing valve 18.

The screw type feeder / mixer 20 has a screw so that the hopper 21
The sludge after primary dehydration supplied from the whole solid content, and sufficiently kneaded so that the bubbles are in a dispersed state,
In the elastic film body 10, each air bubble is made to be easily exhausted to the exhaust chamber 14 in an airtight state.

A feed hopper 21 of the screw type feeder / mixer 20 is connected to a slurry tank 24 and a flocculant tank 25 through an appropriately known centrifugal separator 22.

Thus, a slurry having a high water content ratio containing activated sludge from a construction site or the like is stored in a predetermined manner in the slurry tank 24, and an appropriate amount of salt iron, quick lime or the like is stored in the flocculant tank 25. Flocculant is stored.

The centrifugal separator 22 is provided with a centrifugal dehydrator known in the art, and the slurry from the slurry tank 24 is supplied with the slurry in which the coagulant is mixed to perform solid-liquid separation as appropriate. It is designed to be dehydrated and supplied to the supply hopper 21.

A sludge discharge port 17 'is provided in the rear portion of the casing 3 adjacent to the sludge supply port 17, and a pressure feed passage 27 having an electromagnetic opening / closing valve 26 is provided as a filter press 28 as a solid-liquid separation device. And the cake discharge belt conveyor 29 can supply the chocolate-like cake 30 to the autoclave 31 of the carbonization plant 2.

Then, in the carbonization plant 2, as shown in FIG. 2, a duct 33 is provided via an electromagnetic opening / closing valve 32.
Is connected to an exhaust pump 34 so that the autoclave 31 can be brought to a predetermined vacuum state.

Reference numeral 35 denotes an openable and closable sealed lid of the autoclave 31, which can be opened and closed by a joint 36 and a hook 37 and can be opened freely. An electromagnetic open / close valve is provided via a flexible hose 38. A circulation pipe 40 having 39 is provided, a predetermined cooling type liquid removing device 41 and a deodorizing device 42 are inserted, and the pump 4
At 3, the burner 44 of the autoclave 31 can circulate and burn the dry distillation gas of the sludge 30 in the autoclave 31.

Reference numeral 45 is a water tank for recovering the water content in the circulating dry distillation gas.

In the system plant having the above-mentioned structure, the activated sludge containing a high concentration of the predetermined activated sludge from the construction site is supplied from the slurry tank 24 to the centrifugal separator 22 and, at the same time, salt iron and quick lime are fed from the flocculant tank 25. For example, 5 to 10% by weight of a flocculant is supplied to the feed hopper 21 of the screw-type feeder / mixer 20 in the form of semi-dehydrated sludge having a water content of 75 to 90% by primary dehydration. .

In this case, the slurry is composed of an inorganic substance,
When the ratio of organic matter is 40% or less, the water content is 40%.
It is also possible to design sludge of about 60%.

Then, a screw type feeder / mixer 20 is rotated by a motor 19 to open the electromagnetic open / close valves 18 and 15 while kneading the semi-dehydrated sludge into a uniform dispersion state and further into a uniform dispersion state. Valve 2
6 and 13 are closed and supplied into the sludge chamber 12 of the elastic film body 10 of the casing 3.

In this case, the sludge supplied from the slurry tank 24 through the centrifugal separator 22 and the mechanical parts such as the supply hopper 21 is in a state of containing fine air bubbles therein, but it also functions as a screw type feeder. Mixer 2
By 0, the foaming is integrated and increased in size, made into a uniformly dispersed state, and supplied into the elastic film body 10 of the casing 3 together with the sludge.

In the process, the working oil is returned from the working fluid chamber 11 in the casing 3 to the oil tank 8 by the action of the switching valve 6 and the hydraulic pump 7, and the elastic film body 1 is returned.
No. 0 expands and contracts in a push-pull manner, and in combination with the extrusion of the screw type feeder / mixer 20, the sludge in which the air bubbles are uniformly dispersed is the sludge chamber 1 in the elastic film body 1.
2 is supplied in full condition.

When the elastic film body 10 comes into contact with the support mesh body 9 from the inside, the state is detected by an optical sensor (not shown), and the motor 19 and the hydraulic pump 7 are also transmitted through a control device (not shown). Stops, elastic membrane body 1
The expanded state of 0 is stopped and pressed against the inner surface of the support 9.

Then, the electromagnetic opening / closing valve 13 is opened via a control device (not shown), the oil pump 7 is operated for a set minute time, the working oil chamber 11 is pressurized by the supply of working oil, and the elastic film body 10 is slightly contracted. When the amount is small, the internal sludge chamber 12 is in a pressurized state, where the sludge chamber 12 is
The sludge in the inside is pressed, and the large-sized bubbles in the uniformly dispersed state are forcibly compressed and escape upward, and are trapped in the exhaust chamber 14 in the pressed state.

In this case, the electromagnetic opening / closing valve 15 is closed, and the air of bubbles in the sludge is stored in the exhaust chamber 14.

Therefore, after a set minute time, the electronic on-off valve 13 is closed and the on-off valve 18 is maintained in the closed state via the control device to prevent the sludge from flowing backward to the screw type feeder / mixer 20 and to prevent electromagnetic interference. Type opening / closing valves 26, 15 are opened, the air in the exhaust chamber 14 is degassed via the motor 16, and the sludge is supplied to the filter press 28 via the opening / closing valve 26 and the pressure feed passage 27 in the absence of dispersed bubbles. A predetermined solid-liquid separation is performed as in the conventional mode.

In this case, as a solid-liquid separation action, the pressure applied by the reduction of the elastic film body 10 is, for example, 40 kgf / cm.
² is sufficient (actually, the same effect can be obtained even with 39 to 38 kgf / cm ² ), and therefore secondary dehydration is performed in the filter press 28, and primary dehydration by the centrifugal separator 22 is performed as a whole. Then, the second stage dehydration is performed by the secondary dehydration of the filter press 28 for the semi-dehydrated sludge.

In the solid-liquid separation by the filter press 28, the large-sized bubbles in the sludge chamber 12 in the elastic film body 10 are degassed to the outside of the system through the exhaust chamber 14, so that the bubbles are removed. The water supply passage (mizumichi) disappears from the inside of the sludge, resulting in a low water content, high-efficiency solid-liquid separation, and a chocolate-like cake being formed. The chocolate-like cake 3 from the carry-out conveyor 29 has a sufficient peelability without sticking to the filter cloth depending on the ratio.
0 can be carried out very easily, and the filter press 28 can be operated smoothly.

This means that, as described above, the water passage (Mizu-Michi) disappears, so that a chocolate-like cake with an extremely low water content is obtained, and solid-liquid separation by a conventional one-stage filter press As a result, a chocolate-like cake 30 having a low water content can be obtained.

The water content in this case is 50 as measured by experiment.
It was confirmed to be as high as ˜56%, and it was found that the thickness of the chocolate-like cake 30 was as thick as 17 to 20 mm.

In this way, even if the obtained chocolate-like cake 30 is incinerated as it is and disposed of in the buried state, the volume reduction is high and the disposal is extremely easy.

However, in the invention of this application, the chocolate-like cake 30 which is solid-liquid separated by the filter press 28 is further subjected to dry distillation to be effectively reused for various materials as shown in FIG. In the carbonization plant 2
At this time, the lid 35 is opened via the joint 36 and the hook 37 (at that time, the gas exhaust circulation passage 40 does not interfere with its circulation function via the flexible hose 38), and a predetermined amount of the chocolate-like cake 30 is placed inside. Supply and fill, close the lid, and operate the exhaust pump 34 to operate the electromagnetic on-off valve 3
2 is opened and the inside of the autoclave 31 is evacuated to a predetermined low pressure through the duct 33, the autoclave 31 is heated by the burner 44, and the chocolate cake 30 is dry-distilled by low pressure heating.

The dry distillation gas generated in the autoclave 31 is circulated through the flexible hose 38, the circulation passage 42 and the pump 43 through the opening of the opening / closing valve 39, and is interposed in the passage. Water (water vapor) contained in the dry-distilled gas is coagulated by cooling by the cooling type liquid removing device 41 and is forcibly removed into the water tank 45, and organic odor contained in the dry-distilled gas is deodorized. It is deodorized by the device 42, forcedly circulated in the burner 44, and provided for combustion as fuel.

Then, the solid content which has been carbonized in the form of coke is appropriately taken out through the opening of the lid 35. For example, a filtering material, a deodorant, a soil improving agent, a soil improving agent, a building material, and a solid fuel. It is effectively recovered and used as charcoal.

The above-mentioned integrated plant can be continuously operated in a flow system by a controller (not shown).

Of course, the embodiment of the invention of this application is not limited to the above-mentioned embodiment. For example, as a hardware of a solid-liquid separation plant, a mesh body or the like is reduced on the sludge chamber side of the elastic membrane body. It is possible to adopt various modes such as providing a posture support so as to prevent the occurrence of cracks or breakage due to repeated wrinkles caused by folding of the elastic film body. or,
The activated sludge such as slurries and sludges that are applicable are applicable not only to construction waste and industrial waste liquid, but also to activated sludge discharged from agricultural and marine products and food industry, for example, squeezed okara, organic matter and inorganic matter. It does not matter the mixing ratio of.

[0040]

As described above, according to the invention of this application, a filter press having an extremely high solid-liquid separation efficiency is basically used for solid-liquid separation treatment of a slurry containing activated sludge such as construction waste material having a high water content ratio. In using, after performing primary dehydration on the slurry to make the sludge in a semi-dehydrated state uniformly dispersed, deaerating the bubbles contained therein to form a sludge with a low water content ratio, and then removing the sludge. By carrying out the secondary dehydration by pressure-feeding to the filter press by the high-pressure pumping device having the elastic film body, the bubbles between solids disappear in the solid-liquid separation process of the secondary dehydration, and the so-called water passage By eliminating the water passage, solid-liquid separation of sludge with an extremely low water content is performed in two stages, and a chocolate-like cake is obtained, and the volume can be reduced during the subsequent dry distillation treatment, etc., and it is directly incinerated. And disposal buried It is also possible to perform fractionation, etc., and when performing dry distillation treatment, the amount of water vapor etc. of the dry distillation gas generated is small, so that it can be reliably reused for filtration media, deodorants, surfactants, fuel charcoal, etc. It is carried out, and it has an excellent effect that pollution is prevented and the environment is harmonized with effective reuse of resources.

Therefore, the primary dehydration is performed in the solid-liquid separation, and the semi-dehydrated sludge resulting from the primary dehydration is subjected to the secondary dehydration through the filter press to perform the two-stage type slurry treatment, thereby increasing the facility cost. However, as a result, it has an excellent effect of effectively acting on industrial policy.

Further, since it can be effectively reused as a filtering material, a deodorant, a surfactant, a soil conditioner, a fuel charcoal, a construction material, etc., it has an excellent effect that the resources can be activated and can be recycled. To be done.

Further, the invention of this application has an advantage that it is extremely effective as a system plant because the entire processing is performed systematically.

[Brief description of drawings]

FIG. 1 is a structural schematic diagram of a solid-liquid separation plant of the invention of this application.

FIG. 2 is a schematic diagram of the structure of a carbonization plant.

[Explanation of symbols]

 3 Casing 10 Elastic Membrane 12 Sludge Chamber 28 Solid-Liquid Separator (Filter Press) 14 Exhaust Chamber 20 Sludge Supply Device 17 Supply Port 17 'Discharge Port 13,14,15 Degassing Device 13,15,18,26 Open / Close Valve

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[Procedure amendment]

[Submission date] January 8, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Two-stage slurry processing method and apparatus

[Claims]

Detailed Description of the Invention

[0001]

[Industrial application] The disclosed technology is a system for effective solid-liquid separation of slurries and sludges discharged from factory waste liquid, construction waste materials, etc., and effective reuse of solid-liquid separated chocolate-like cake. Belong to the technical field.

[0002]

As Background of the Invention of the well-known, prosperity of the industry is improvement of civic life, but have contributed greatly to the development of culture, in recent years, or cause the development of the industry is large-scale pollution problems, global environmental pollution As a result, industrial development has become impossible to ignore these, and it is not possible to survive without harmony with these. It is even gaining attention as a new industry.

Thus, in various chemical industries, pharmaceutical industries, food industries, chemical industries, agricultural and marine industries, construction industries, etc., not only effective treatment of industrial waste liquids and industrial wastes discharged therefrom, but also active As a result, there is a growing demand for effective reuse. Especially, the volume reduction of sludge generated from slurries of factory waste liquid, construction waste liquid, etc. and the ease of incineration, burial, etc. have simply been negative. A technology that can be effectively reused as a construction material, deodorant, filtering agent, surfactant, etc. by adding and mixing a coagulant etc. was developed, and a system including both was also developed. Research has been improved.

In addition, as a means for effectively reusing sludge, which is obtained by first performing solid-liquid separation of the slurry, by finally performing solid-liquid separation to reduce the volume to a chocolate-like cake, incinerating, burying, and further solidifying. Filter presses are widely used in systems that can achieve extremely high solid-liquid separation efficiencies and are playing an active role.

[0005]

However, such a filter press, which basically has extremely high solid-liquid separation efficiency, is more effective than various solid-liquid separation devices, but has a high water content in the slurry supplied. In this case, in the solid-liquid separation process of sludge, even if a so-called water passage in the solid particles is formed and dehydration is performed from a predetermined area outside the water passage, the water passage and the vicinity thereof Has a drawback that a chocolate-like cake cannot be obtained in the solid-liquid separation area between the filter frames, and since the cake has a large amount of water, the cake adheres to the filter cloth. However, there is a disadvantage that the cake is not easily peeled off and removed smoothly, and as a result, the operation as designed of the filter press is hindered.

Even if solid-liquid separation can be performed in spite of course, it is still difficult to obtain a recycled material from the cake obtained by the solid-liquid separation due to the high water content ratio.

[0007]

OBJECT OF THE INVENTION The object of the invention of this application is to solve the problems in the slurry treatment centering on the filter press used in the solid-liquid separation system for the pollution prevention and environmental harmony accompanying the development of the industry based on the above-mentioned prior art. As a technical problem to be solved, primary dehydration is carried out in advance in a semi-dehydrated state for solid-liquid separation of slurry into sludge so that the function of the filter press can be fully exerted, and then the primary dehydrated sludge is fed by high pressure. Is sent to a filter press under pressure to ensure a low water content chocolate-like cake by secondary dehydration, and the dry distillation process in the next stage makes it possible to reuse the waste material of activated sludge to prevent pollution in various industries. Technology and an excellent two-stage slurry processing method that benefits the field of environmentally friendly technology, and a slurry processing apparatus used directly in the method It is intended to provide cents.

[0008]

[Means and Actions for Solving the Problems] In order to solve the above-mentioned problems, the structure of the invention of the present application, which is based on the above-mentioned object, has
Add a predetermined coagulant to the slurry such as activated sludge,
The water content of the inorganic slurry is 40 to 60%, and that of the organic slurry is about 75 to 90%, and the mixture is kneaded with a mixer in a semi-dehydrated state, and this is pressed into the elastic membrane of the high-pressure pumping device, and , The elastic membrane body is repeatedly expanded and contracted by negative pressure, positive pressure, etc., and is formed in the sludge in the expansion and contraction process, and becomes a water passage which becomes an obstruction condition in solid-liquid separation by the next filter press. In order to prevent the formation, exhaust degassing or intake degassing is performed, the water content is reduced, and the mixture is pressure fed to a filter press at a pressure of 30 kgf / cm ² , or once about 40 to 60 for slurry such as activated sludge. % Semi-dehydrated into a kneaded state similar to the above, pressure-fed to a filter press for solid-liquid separation under high pressure to form a chocolate cake having a thickness of about 17 to 20 mm, and the resulting chocolate The cake is fed to an autoclave and vacuum heated to dry distillation, and the exhaust gas is circulated to cool and dehydrate, deodorize and burn with a burner, and finally filter, deodorant, and surface active. Agent, fuel charcoal,
Alternatively, it is a technical measure that can be effectively reused as a useful material such as a solidifying material for construction.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the invention of this application with reference to the drawings.

The illustrated embodiment is an embodiment of a sludge treatment system for effectively reusing the slurry discharged from construction sludge or the like as a filtering material or a deodorant as a material, or a construction material, and shows the hard part. There is a solid-liquid separation plant 1 at the front stage shown in FIG. 1 and a dry distillation plant 2 at the rear stage shown in FIG. 2, both of which are installed next to each other.

As shown in FIG. 1, in the solid-liquid separation plant, the oil suction / discharge port 4 for the working fluid passes through the check valve 5 and the switching valve 6 on one side of the drum type casing 3 of the pumping apparatus 1. It is connected to an oil tank 8 having a hydraulic pump 7 through it, and a swelling type wire mesh support 9 is provided inside the casing 3, and a swelling member made of rubber or the like is swelled inside thereof. Type elastic film body 10 is provided so as to be expandable and contractible, and is provided together with the base of the mesh body 9 in the casing 3 so that the outside of the elastic film body 10 is divided into a hydraulic fluid chamber 11 and an inner sludge chamber 12. An exhaust chamber 14 is provided above the base of the casing 3 in the sludge chamber 12 via an electromagnetic open / close valve 13, and a filter 16 is connected via the open / close valve 15.

A sludge supply port 17 is provided at the rear of the casing, and a screw type feeder / mixer 20 connected to a drive motor 19 via an electromagnetic opening / closing shutter 18 is connected.

Since the screw type feeder / mixer 20 has a screw fin, the solid content and the air bubbles are uniform throughout the sludge feed after the primary dehydration supplied from the hopper 21. The kneading is sufficiently performed so that the air bubbles are exhausted to the exhaust chamber 14 in the airtight state in the elastic film body 10 by sufficiently kneading so as to be in a dispersed state.

A feed hopper 21 of the screw type feeder / mixer 20 is connected to a slurry tank 24 and a flocculant tank 25 through an appropriately known centrifugal separator 22.

Thus, a slurry having a high water content ratio containing waste mud from a construction site or the like is stored in the slurry tank 24 in a predetermined manner, and an appropriate amount of salt iron, quick lime or the like is stored in the flocculant tank 25. Flocculant is stored.

The centrifuge 22 is provided with a known centrifugal dehydrator, and the slurry from the slurry tank 24 is supplied with the above-mentioned coagulant agent-mixed slurry from the coagulant tank 25. The solid-liquid separation is performed and the sludge in the primary dehydration state is supplied to the supply hopper 21.

A sludge discharge port 17 'is provided adjacent to the sludge supply port 17 at the rear part of the casing, and a pressure feed passage 27 is provided via an electromagnetic opening / closing valve 26 and a filter press as a solid-liquid separation device. A cake discharge belt conveyor 29, which is connected to the lower part 28, can supply the chocolate-like cake 30 to the autoclave 31 of the carbonization plant 2 described in detail below.

Then, in the carbonization plant 2, as shown in FIG. 2, a duct 33 is provided via an electromagnetic opening / closing valve 32.
Is connected to an exhaust pump 34 so that the inside of the autoclave 31 can be brought to a predetermined vacuum state.

Reference numeral 35 denotes an openable / closable sealed lid in the autoclave 31, which includes a joint 36 and a hook 37.
A circulation pipe 40 having an electromagnetic opening / closing valve 39 is provided via a durable flexible hose 38, and a predetermined cooling type liquid removing device 41 and a deodorizing device are provided. 42,
The burner 44 of the autoclave 31 can be circulated by the pump 43 to burn the dry distillation gas from the sludge 30 in the autoclave 31 in a circulating manner.

Reference numeral 45 is a water tank for recovering the water content in the circulating dry distillation gas.

In the system plant having the above-described structure, slurry containing a predetermined concentration of sludge from the construction site is supplied from the slurry tank 24 to the centrifugal separator 22, and at the same time, salt iron, quick lime, etc. are supplied from the flocculant tank 25. 5 to 10% by weight of the predetermined flocculant is supplied to the centrifugal separator 2
2 through the centrifugal dehydrator, and is subjected to primary dehydration as designed to form a semi-dehydrated sludge having a water content of 75 to 90% and is supplied to the feed hopper 21 of the screw-type feeder / mixer 20.

In this case, when the composition of the slurry is about 40% or less of the organic matter, it is possible to design the primary dehydrated sludge having a water content of about 40 to 60%.

Then, the screw type feeder / mixer 20 is rotated by the motor 19, and the electromagnetic shutter 18 and the electromagnetic opening / closing valve 15 are opened while further kneading and stirring so that the semi-dehydrated sludge is uniformly dispersed. On the other hand, the electromagnetic on-off valves 26 and 13 are closed to supply pressure to the sludge chamber 12 of the elastic film body 10 of the casing 3.

In this case, the sludge supplied from the slurry tank 24 through the centrifugal separator 22 and the respective mechanical parts such as the supply hopper 21 is in a state in which fine sludge is unavoidably contained in the sludge. In the process of passing through it by the type of feeder / mixer 20, the foaming is integrated into a large size, made into a uniformly dispersed state, and supplied into the elastic film body 10 of the casing 3 together with the sludge.

In the process, for the hydraulic fluid chamber 11 in the casing 3, the working oil is returned to the oil tank 8 by the action of the switching valve 6 and the hydraulic pump 7 and sucked to push the elastic film body 10. The sludge, which has been expanded and contracted in a pulling manner and has the air bubbles uniformly dispersed in combination with the extrusion pressure of the screw type feeder / mixer 20, is the elastic film body 10.
The sludge chamber 12 therein is supplied in a filled state.

When the elastic film body 10 comes into contact with the mesh body 9 of the support from the inside, the state is detected by an optical sensor (not shown), and the motor 19 and the hydraulic pump are also transmitted through a control device (not shown). 7 stops, the expanded state of the elastic film body 10 stops, and the inner surface of the support body 9 is pressed to prevent the appearance of an overtension state, thereby avoiding material fatigue.

Then, the electromagnetic opening / closing valve 13 is opened by the program through a control device (not shown), the electromagnetic opening / closing valve 15 is closed, the oil pump 7 is operated for a set minute time, and the hydraulic fluid chamber 11 is operated with the operating oil. When the pressure is increased by the supply and the elastic film body 10 is slightly shrunk, the internal sludge chamber 12 is put in a pressurized state, whereupon the sludge in the sludge chamber 12 is subjected to a pressing action to be enlarged in a uniformly dispersed state. Each bubble is forcedly compressed and escapes upward, and is trapped in the exhaust chamber 14 under pressure.

In this case, the electromagnetic on-off valve 1
No. 5 is closed, and the air of bubbles in the sludge is stored in the exhaust chamber 14.

Therefore, after a set minute time, the electromagnetic opening / closing valve 13 is closed via the control device, and the opening / closing shutter 18 is opened.
Keeps the sludge 12 under pressure and keeps it closed,
The sludge to the screw type feeder / mixer 20 is prevented from being adversely affected, and then the electromagnetic open / close valves 26 and 15 are opened according to a program through the control device, and the air in the exhaust chamber 14 is degassed via the filter 16. The sludge is opened and closed with the open / close valve 26,
It is supplied to the filter press 28 through the pressure-feeding passage 27, and is surely subjected to a sufficient compression action, and a predetermined solid-liquid separation is performed as in the conventional mode.

In this case, the pressure applied to the sludge due to the contraction of the elastic film body 10 as a solid-liquid separation action is, for example,
40 kgf / cm ² is sufficient (actually 39 to 38 kgf
The same effect can be obtained even with / cm ² . ), Therefore
(4) Secondary dehydration is carried out in the filter press 28, and as a whole, two-stage dehydration is carried out by the primary dehydration by the centrifugal separator 22 and the secondary dehydration of the filter press 28 with respect to the sludge after the semi-dehydration. The solid-liquid separation is performed by the dehydration close to the above, and the solid-liquid separation is performed by the almost complete dehydration.

In the solid-liquid separation by the filter press 28, the large-sized bubbles in the sludge chamber 12 in the elastic film body 10 of the pumping device are degassed to the outside of the system through the exhaust chamber 14. , Water supply passage for the bubbles (MizuMichi)
Will disappear from the sludge, the water content will be low, solid-liquid separation will be performed with high efficiency, and a chocolate-like cake 30 will be formed, which will be filtered by the low water content of the chocolate-like cake 30 when the frame is opened. There is no adhesion to the cloth, a sufficiently good peeling property is obtained, the chocolate-like cake 30 is carried out from the carry-out conveyor 29 very easily, and the filter press 28 operates smoothly.

This means that, as described above, the water passage (Mizu-Michi) disappears, so that a chocolate-like cake with an extremely low water content is obtained, and solid-liquid separation by a conventional one-stage filter press As a result, a chocolate-like cake 30 having a low water content can be obtained.

The water content in this case is 50 as measured by experiment.
It was confirmed to be as high as ~ 56%, and it was found that a thick block-type cake having a chocolate-like cake 30 of 17 to 20 mm was obtained.

In this way, even if the obtained chocolate-like cake 30 is incinerated as it is and disposed of as buried, the volume reduction due to dehydration is highly performed, and therefore the disposal is extremely easy.

However, in the invention of this application, the chocolate-like cake 30 which is solid-liquid separated by the filter press 28 is further subjected to dry distillation to be effectively reused for various materials as shown in FIG. In the carbonization plant 2
At this time, the lid 35 is opened via the joint 36 and the hook 37 (at that time, the gas exhaust circulation passage 40 does not hinder its circulation function via the flexible hose 38), and the chocolate-like cake 30 is placed inside. A fixed amount of supply is filled, the lid is closed and the electromagnetic open / close valve 32 is opened through the operation of the exhaust pump 34, the inside of the autoclave 31 is brought into a vacuum state of a predetermined low pressure through the duct 33, and the autoclave 31 is heated by the burner 44. The chocolate-like cake 30 is dry-distilled by low pressure heating.

The dry distillation gas generated in the autoclave 31 is circulated through the flexible hose 38, the circulation passage 42 and the pump 43 through the opening of the opening / closing valve 39, and is interposed in the passage. Water (water vapor) contained in the dry-distilled gas is coagulated by cooling by the cooling type liquid removing device 41 and is forcibly removed into the water tank 45, and organic odor contained in the dry-distilled gas is deodorized. It is deodorized by the device 42, forcedly circulated in the burner 44, and provided for combustion as fuel.

Then, the solid content which has been carbonized in the form of coke is appropriately taken out through the opening of the lid 35, and for example, a filtering material, a deodorant, a soil improving agent, various building materials, solid fuel charcoal, etc. Is effectively collected and used.

The above-mentioned integrated plant can be continuously operated in a flow system by a controller (not shown).

Of course, the embodiment of the invention of this application is not limited to the above-mentioned embodiment. For example, as a hardware of a solid-liquid separation plant, a mesh body or the like is reduced on the sludge chamber side of the elastic membrane body. It is possible to adopt various modes such as providing a posture support so as to prevent the occurrence of cracks or breakage due to repeated wrinkles caused by folding of the elastic film body. or,
Not only activated sludge but also construction sludge and factory effluent can be applied not only to activated sludge but also to activated sludge discharged from agricultural and marine products and in the food industry, for example, squeezed okara. Therefore, the mixing ratio of organic substances and inorganic substances does not matter.

[0040]

As described above, according to the invention of this application, it is possible to obtain a solid-liquid separation efficiency which is basically high in the solid-liquid separation treatment of a slurry such as a construction waste sludge having a high water content or a slurry containing activated sludge. When using a good filter press, after performing primary dehydration on the slurry to make the sludge in a semi-dehydrated state a uniform dispersion state, deaerating the bubbles contained therein to form a sludge having a low water content, By carrying out the secondary dehydration by pressure-feeding the sludge to a filter press by a high-pressure pressure-feeding device having an elastic film body, air bubbles between solids disappear in the solid-liquid separation process of the secondary dehydration, so-called By eliminating the water passage in the road, solid-liquid separation of sludge with an extremely low water content is performed in two stages, and a chocolate-like cake is obtained, and the volume can be reliably reduced in the next stage of carbonization treatment, etc. Burned directly It is possible to dispose of it and dispose of it in a buried place. In addition, when the dry distillation treatment is further performed, the steam content of the dry distillation gas is small, and the filtering material, soil conditioner, deodorant, surfactant and fuel charcoal produced by dry distillation are used. It is effectively reused for other purposes, and it has the excellent effects of effective reuse of resources, pollution prevention, and environmental harmony.

Therefore, in the solid-liquid separation, the primary dehydration is performed, and the sludge in the semi-dehydrated state by the primary dehydration is subjected to the secondary dehydration through the filter press to perform a two-stage type slurry treatment, which is slightly high in terms of facility. As for cost, as a result, it has an excellent effect of effectively acting on industrial policy.

Further, since it can be effectively reused as a filtering material, a deodorant, a surfactant, a soil conditioner, a fuel charcoal, a construction material, etc., it has an excellent effect that the resources can be activated and can be recycled. To be done.

In addition, the invention of this application has an advantage that it is extremely effective as a system plant because the entire treatment of the slurry from the generation source to the dry distillation is systematically performed as one plant.

[Brief description of drawings]

FIG. 1 is a structural schematic diagram of a solid-liquid separation plant of the invention of this application.

FIG. 2 is a schematic diagram of the structure of a carbonization plant.

[Explanation of Codes] 3 Casing 10 Elastic Membrane 12 Sludge Chamber 28 Solid-Liquid Separator (Filter Press) 14 Exhaust Chamber 20 Sludge Supply Device 17 Supply Port 17 'Discharge Port 13,14,15 Degassing Device 13,15,18 , 26 open / close valve

Front page continuation (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C02F 11/10 ZAB Z 7824-4D

Claims (13)

[Claims] 1. A primary dehydrated sludge is supplied into a bulging elastic membrane provided in a casing to primary dehydrate the sludge through expansion and contraction of the elastic membrane, and then solid-liquid separation in the next stage. In a two-stage slurry processing method in which the sludge is extruded into a device for secondary dehydration and then subjected to the secondary process, the primary dehydrated sludge is kneaded in a uniformly dispersed state, and then fed into the elastic membrane body to obtain the elasticity. A two-stage slurry processing method, wherein the gas in the sludge is degassed to the outside of the casing in the process of expanding and contracting the membrane. 2. The two-stage slurry processing method according to claim 1, wherein the sludge is supplied into the elastic film body while stirring. 3. The two-stage slurry processing method according to claim 1, wherein the deaeration is performed by a shrinking process of the elastic film body. 4. The two-stage slurry processing method according to claim 1, wherein the degassing is forcibly performed by suctioning with negative pressure. 5. A water content of 75 to 9 in the primary dehydration of the sludge.
The two-stage slurry processing method according to claim 1, wherein the semi-dehydrated state is set to 0%. 6. A water content of 40 to 6 in the primary dehydration of the sludge.
The two-stage slurry processing method according to claim 1, wherein the semi-dehydrated state is set to 0%. 7. A primary dehydrated sludge is supplied to a swollen elastic membrane provided in a casing, the sludge is primarily dehydrated through expansion and contraction of the elastic membrane, and then solid-liquid separation in the next stage is performed. In a two-stage slurry processing method in which the primary dehydrated sludge is kneaded and then fed into an elastic membrane body in a two-stage slurry processing method in which the sludge is subjected to secondary dehydration by pressure-feeding to an apparatus and then subjected to the next stage treatment. The gas inside the sludge is degassed to the outside of the casing, and the chocolate-like cake obtained by solid-liquid separation is subjected to carbonization treatment in an autoclave. Two-stage type slurry processing method. 8. An expansion / contraction type elastic film body is provided in a drum type casing so as to be expandable / contractible with its base fixed to the casing, and a base provided with a supply port connected to a sludge supply device In a slurry processing apparatus provided with a discharge port connected to a solid-liquid separation device of a stage, the sludge supply device has a kneading device, and a deaerator is provided at the base of the casing. A two-stage slurry processing device characterized by the above. 9. The two-stage slurry processing apparatus according to claim 8, wherein the deaerator is provided with an opening / closing valve. 10. The two-stage slurry processing apparatus according to claim 9, wherein the on-off valve is an electromagnetic valve. 11. A two-stage slurry processing apparatus according to claim 8, wherein an autoclave is connected to the solid-liquid separation apparatus. 12. A two-stage slurry processing apparatus according to claim 11, wherein the autoclave is additionally provided with a gas circulation device. 13. The two-stage type slurry processing apparatus according to claim 12, wherein the circulation device is additionally provided with a liquid removing device and a deodorizing device.