JPH06206097A - Method and device for two step treatment of slurry - Google Patents

Abstract

PURPOSE:To obtain the sludge of a low water content and contrive an effective reuse of resources through dry distillation thereof by a two step method of dewatering slurry, i.e., a primary and a secondary dewatering operation. CONSTITUTION:An elastic membrane body 10 in a casing 3 of a force feeding device is expanded and contracted by operating fluid, slurry is dewatered as a first step by a centrifugal separator 22 and then rendered into slurry form by a screw type combination feeder-mixer 20, the sludge is sent into a sludge chamber 12 and the air bubbles dispersed in the chamber is deaerated in an exhaust chamber 14 through a silicone filter 14' therein. A water channel-free sludge of a low water content thus formed is sent into a filter press 28 so as to be rendered into a cake 30 as in the form of a chocolate, the cake 30 is dry distilled by an autoclave 31, the gas resulting the distillation is circulated through a circulating passage for dehydration and deodorization thereof, the gas is thereafter burned by a burner and the resulting coked solid is effectively reused.

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 has greatly contributed to the improvement of civic life and the development of culture, but recently, the development of industry has caused large-scale pollution problems and caused global 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, sludge mist is removed during this period, and explosive air scavenging is performed with high pressure air.
The water content is reduced and 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 by about 40 to 60% to a kneading state as described above, and pressure-fed to the filter press. Solid-liquid separation under high pressure to form a chocolate cake having a thickness of about 17 to 20 mm, and the obtained chocolate cake is further
It is supplied to an autoclave, heated by vacuum and subjected to dry distillation, and the exhaust gas is circulated for cooling, dehydration, deodorization, burning with a burner, and finally filtering material, deodorizing agent, surfactant, fuel charcoal, or It is a technical measure that enables effective reuse as a solidified 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 a mode of a sludge treatment system for effectively reusing slurry discharged from construction sludge or the like as a filtering material or a deodorant as a material, or a construction material, and a hard part is shown. 1, a solid-liquid separation plant 1 in the first stage shown in FIG. 1 and a dry distillation plant 2 shown in the second stage in FIG. 2 are arranged 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 an external filter 16 is connected to the site separated by a considerable distance via an open / close valve 15. ing.

Further, inside the exhaust chamber 14, a ceramic filter 14 'having fine voids as an internal filter in its entire cross section is horizontally installed, and deaeration of mixed pressure air or the like from the slurry chamber 12 will be described later. In doing so, slurry mist or the like enters the exhaust chamber 14 and is accumulated therein so that the exhaust function is not impaired, and a high pressure air outlet 14 '' is opened on one side of the upper part of the ceramic filter 14 '. Then, the high-pressure compressed air source 14 '''is connected to the electromagnetic on-off valve 13
', The high pressure air is blown into the exhaust chamber 14 through the slurry mist ceramic filter 14', and is piled up.
It is designed so that it can be explosively expelled from and discharged through the external filter 16.

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

Since the screw-type feeder / mixer 20 has a screw fin, the solid content and the air bubbles are uniform throughout the pre-dewatering sludge feed before being fed 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 via an appropriate centrifugal separator 22 which is well known in the art.

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 coagulant tank 25. Flocculant is stored.

The centrifugal separator 22 is provided with a known centrifugal dehydrator, and the slurry from the slurry tank 24 is supplied with the slurry in which the above-mentioned coagulant agent is mixed 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 through an electromagnetic opening / closing valve 26 to 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.

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 designates a hermetically-sealing lid which can be freely opened and closed in the autoclave 31, and 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 dehumidifying liquid device 41 and a deodorizing device are provided. 42 is inserted so that the dry distillation gas from the sludge 30 in the autoclave 31 can be circulated by a pump 43 in a burner 44 of 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-mentioned structure, the 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 the sludge in a semi-dewatered state so as to be 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 inevitably contains fine air bubbles inside, but the screw 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 is 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 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 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 closed, the electromagnetic opening / closing valve 13 is opened, the electromagnetic opening / closing valve 15 is closed, and the oil pump 7 is operated for a set minute time by a program through a control device (not shown). Then, the hydraulic fluid chamber 11 is pressurized by the supply of hydraulic oil, and the elastic film body 10
Is reduced a little, the internal sludge chamber 12 is put into a pressurized state, and the sludge in the sludge chamber 12 is pressed by the compressed air bubbles, which are uniformly dispersed. And escapes upward and is trapped in the exhaust chamber 14 under pressure.

In this process, the exhaust chamber 1
4 has a ceramic filter 14 ', the slurry mist is prevented from entering the sludge chamber 14, and the electromagnetic valve 13' is closed, so that high pressure air is not ejected into the exhaust chamber 14 and the sludge chamber 14 ' Only the mixed gas and liquid is stored in the exhaust chamber 14.

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.

If, unexpectedly, with time, microparticles such as sludge mist intrude into the exhaust chamber 14 through the fine voids of the ceramic filter 14 ',
The electromagnetic on-off valve 13 'is opened through the control device in a predetermined manner, and high-pressure air is supplied from the high-pressure air source 14'''.
'' To the exhaust chamber 14 '', the sludge mist accumulated by the explosive air energy is scavenged, and is discharged to the external filter 16 side through the opening / closing valve 15.

In this process, since the voids in the ceramic 14 'of the inner filter are minute, the flow resistance is large, and the blast air is not returned to the sludge chamber 12, nor is the sludge mist returned.

The external filter 16 easily filters and discharges the sludge mist at that time.

Therefore, the exhaust function of the exhaust chamber 14 is always maintained.

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 reduction 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
Secondary dehydration is performed in the filter press 28, and as a whole, the secondary dehydration is performed by the primary dehydration by the centrifugal separator 22 and the secondary dehydration of the filter press 28 against the semi-dehydrated sludge thereafter. Solid-liquid separation is performed by near dehydration, and solid-liquid separation is performed by 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 (Mizumichi) disappears, so that a chocolate-like cake having an extremely low water content is obtained, and solid-liquid separation by a conventional one-stage filter press is performed. 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 in the buried state, 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.

Then, the dry distillation gas generated in the autoclave 31 is circulated through the flexible hose 38, the circulation passage 42, and the pump 43 by the opening / closing valve 39 being opened, and is interposed in the passage. The water (water vapor) contained in the dry distillation gas is cooled and coagulated by the cooling type dehumidification / liquid removal device 41, and the water tank 45 is then condensed.
The organic odor contained in the dry distillation gas is deodorized by the deodorizing device 42, is forcibly circulated to the burner 44, and is burned 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 conditioner, 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, the sludge chamber side of the elastic membrane is also reduced with a mesh body or the like. 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.

In addition to the activated sludge, not only the construction sludge and the factory effluent but also the activated sludge discharged from agricultural and marine products and the food industry are applied to the applied slurry and sludge.
For example, it can be applied to squeezed okara and the like, regardless of the mixing ratio of organic matter and inorganic matter.

As a matter of course, the elastic film body may be reversed from the above-mentioned embodiment in terms of design change.

As the internal filter in the exhaust chamber, a charcoal filter other than the ceramic filter may be used.

[0049]

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 performed as one plant 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

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B09B 3/00 ZAB 303 H C02F 11/10 ZAB Z 7824-4D

Claims (13)

[Claims] 1. A swelling type elastic film body provided in a casing, which is capable of expanding and contracting, is supplied with sludge which is obtained by primary dehydration of slurry, and the sludge is expanded and contracted through the elastic film body to separate the sludge into the next solid-liquid separation. In a two-stage slurry processing method in which the slurry is subjected to secondary dehydration by pressure-feeding to an apparatus and then subjected to the next-stage treatment, after kneading the sludge obtained by primary dehydration of the slurry into a uniform dispersion state,
The gas contained in the sludge is supplied to the outside of the casing by the expansion and contraction process of the elastic film, and the sludge mist is removed during the degassing. Stepwise slurry processing method. 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 sludge mist is discharged through scavenging with explosive air. 5. The water content in the primary dehydration of the slurry is 75-9.
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 sludge, which is obtained by primary dehydration of a slurry, is supplied into a bulging elastic membrane that is expandable and contractable provided in a casing, and the sludge is expanded and contracted through the elastic membrane to separate the sludge in the next stage. In a two-stage type slurry treatment method in which the sludge is subjected to secondary dehydration by pressure-feeding to an apparatus and subjected to the next stage treatment, after the primary dehydrated sludge is kneaded, the sludge is fed into the elastic membrane body and the elastic membrane body undergoes the expansion / contraction process. The gas contained in the sludge is degassed by removing the sludge mist outside the casing, and the chocolate-like cake obtained by solid-liquid separation is subjected to carbonization treatment in an autoclave. A two-stage type slurry processing method according to item 1 above. 8. A bulging elastic film body is provided in a drum type casing such that its base portion is fixed to the casing so as to be expandable and contractible, and a feed port connected to a sludge feeding device and a next stage are provided at the base portion of the casing. In the slurry processing apparatus provided with the discharge port connected to the solid-liquid separation apparatus, the sludge supply apparatus has a kneading apparatus, and the degassing apparatus is provided at the base of the casing. A two-stage slurry processing device characterized by the above. 9. The two-stage type slurry processing apparatus according to claim 8, wherein an internal filter is attached to the deaerator. 10. The two-stage slurry processing apparatus according to claim 9, wherein the on-off valve is an electromagnetic on-off 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.