JPH06134499A - Bottom sludge treatment process and treatment agent and apparatus therefor - Google Patents

Abstract

PURPOSE:To improve dehydration effect by transporting bottom sludge from which solid substances are removed while stirring it, adding an inorganic treatment agent to crystallize the bottom sludge components in needle-like shape, adjusting the pH, and then flocculating the crystals and converting the crystals to flocks by adding an organic treatment agent. CONSTITUTION:A bottom sludge collecting apparatus 1 directly sucks and collects bottom sludge in a bottom sludge accumulated site. The collected bottom sludge is transported to a separator 3 and sifted based on the specific gravity levels there. The resulting slurry from which foreign substances with high specific gravity are removed is further transported to a treatment agent adding apparatus 4 and an inorganic and an organic treatment agents are respectively added to the slurry through respective hoppers 42, 43 installed respectively above the transportation route 41. After that, the slurry is supplied successively to a stirring apparatus 5 and a pressing apparatus 6 to form a sludge cake. In the treatment agent adding appratus 4, an inorganic type flocculant, a neutralizing agent, and a precipitating agent are added to crystallize the bottom sludge components in the slurry in needle-like crystals and after the pH is adjusted to be 4-9, a polymer organic treatment agent is added to flocculate the crystals and convert them in flocks.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sludge treatment method and treatment agent for forming sludge cake which is easy to handle in order to remove accumulated sludge, which is a problem during dredging and reclamation of rivers, harbors, etc. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, with regard to the treatment of accumulated sludge, by injecting a ground hardening material at the site, the sludge is hardened as it is and hardened, and treated according to the purpose.
It has been practiced to transport sludge to a treatment facility by a truck or the like for dehydration treatment.

As for the dehydration treatment for sludge treatment, flocking with an organic preparation and press treatment have been carried out, but it has been difficult to form a cake having a low water content ratio.

[0004]

[Problems to be Solved by the Invention] Conventional sludge solidification by injecting ground hardening material requires large-scale equipment and personnel, and although it can be applied to large-scale construction, it can be applied to small rivers and simple dredging. Can not be installed.

[0005] Further, it is extremely difficult to collect and transport sludge to a processing facility by a transport vehicle because the sludge is a semi-fluid containing a lot of foreign matter, and also in terms of hygiene such as scattering of sewage. Pollution is accompanied by many problems

[0006] Further, the half cake resulting from insufficient dewatering eventually leaves a problem at the disposal stage and cannot be the final solution.

[0007]

[Means for Solving the Problems] The present invention is to solve the above problems, in which a sludge is directly sucked from a sludge accumulation site by a collecting machine using a suction mouse and a suction hose, and stones and sands are collected on the spot. After removing solid substances such as the above, inorganic preparations were added to perform pretreatment of acicular crystals of sludge components to adjust pH, and then flocculation treatment with organic preparations was performed to enhance the dehydration effect. Is.

Further, as a system device for connecting a collector, a separator, a treatment agent adding device, and a press machine that can be installed at a deposition site with a stirring and conveying hose, the sludge is collected, dehydrated and condensed at the same time, and applied to building materials and the like. It was constructed so that it can be immediately taken out by a carrier etc. as a cake state with a low water content ratio that can be used.

[0009]

[Function] Sludge from which solids such as stones and sand have been removed, aluminum sulfate 50-60%, sodium carbonate 20-30%, Portland cement 3-8%, calcium carbonate 3-8%, calcium hydroxide 5-15 %, The sludge component becomes acicular crystals, and the eluate component to water is conjugated as a crystal body incorporating the sludge component.

Further, when the pH is adjusted to 4 to 9, the floc formation is promoted by the addition of the mixture of the polyacrylic amide copolymer and the alkaline earth metal salt containing calcium chloride as the main component, and the needle-like crystals are excellent. In such a state, it flocculates and precipitates to form a floc containing appropriate moisture.

That is, in the conventional treatment of organic preparations, the sludge component that has flowed out as treated water with the treated water is taken into the crystal by the inorganic treating agent and can be treated as a sludge cake.

Moreover, since the needle-shaped crystals form a fibrous crystal which is advantageous for the sludge squeezing operation by the pressing process, the filtration and dehydration effect by the pressing process is greatly enhanced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 is a sludge collector, which supports a suction hose 22 having a sludge suction mouse 21 at its tip by an operating mechanism 2 such as a swivel device, and is installed on a base such as a barge or the like, and directly sucks and collects sludge in a sludge deposit area. To do.

The sludge-sucking mouse 21 has a jet nozzle 23 for excavating and crushing accumulated soft mud and sludge with a high N value by jetting high-pressure jet water and compressed air from its tip, and a jet bellows-like opening / closing operation for the jet nozzle 23. It consists of a cover 24 that surrounds the surroundings, a suction hole 25 that sucks sludge that has been excavated and crushed, and opens and closes the cover 24 as necessary to inject a jet nozzle 23 to dig and crush sludge, and cover 24 It is designed to be expanded and landed on the sludge deposit area, and the inside pressure is reduced to enhance the effects of suction, excavation and crushing of sludge.

The upper part of the suction hole 25 is connected to the suction hose 22,
The sucked sludge is turned into a spiral flow by the transport pump 26 and the ejector 7 for transport promotion provided with the swirl injection nozzle 71 provided at an appropriate position of the transport hose 29, and is transported to the separator 3 by the transport hose 29.

The transfer pump 26 includes a high-pressure water jet nozzle 27,
A swirl jet nozzle 28 composed of a plurality of jet nozzles that open in the direction of circling flow is provided, and the carrier slurry is mixed with spiral air by the compressed air jet from the swirl jet nozzle 28 and water jet from the high-pressure water jet nozzle 27. In addition to a spiral flow, the carrying force is enhanced, and the carried slurry is constantly stirred and carried while preventing solid-liquid separation.

The separator 3 partitions the inside of a cylindrical tank 31 whose lower part is confined in a funnel shape with a filter net 32, and the spiral flow of the introduced slurry introduces a cyclone effect due to the shape of the tank. Fall into the filter net
The transferred slurry from which foreign substances such as stones, sand, and mud having a large specific gravity were removed by 32 is transferred from the upper suction hole 33 to the storage tank 34, stirred by the submersible mixer, and then measured by the flow meter. Then, a predetermined amount is conveyed by the sand pump to the treatment agent adding device 4.

In the treating agent adding device 4, the slurry conveying route
An inorganic treatment agent addition hopper 42 and an organic treatment agent addition hopper 43 are provided on the upper part of 41, and the inorganic treatment agent is conveyed through a measuring device and the organic treatment agent is conveyed through a polymer stirrer, a gear pump, and a flow meter, respectively. Additions are made to the slurry.

The inorganic treating agent is aluminum sulfate 50 to 60%,
Sodium carbonate 20-30%, Portland cement 3-8
%, Calcium carbonate 3-8%, calcium hydroxide 5-15
%, A powdery agent containing a mixture of 100% as a main component, fly ash or bentonite, and slaked lime as an extender is used. I have to.

These main components are shown as tentative examples. For example, sodium nitrate and magnesium sulfate are replaced with aluminum sulfate, magnesium chloride and calcium chloride are replaced with sodium carbonate, and quick lime is replaced with Portland cement. Even if sodium silicate is used, the effect of acicular crystals and pH adjustment can be obtained, and the effect of sedimentation can be enhanced by adding ferric chloride.

Further, by appropriately selecting the compounding ratio according to the situation and components of the carrier slurry, the effect of adjusting the needle crystals and PH can be enhanced.

As the organic treating agent, a mixture of a polyacrylic amide copolymer and an alkaline earth metal salt containing calcium chloride as a main component is usually used, but other organic treating agents may of course be used. .

The conveyed slurry to which the treating agent has been added is further stirred by the slurry stirrer 5 and, while avoiding floc precipitation, is conveyed to the press 6 by a filter press or a belt press via a gear pump, and is dehydrated and condensed. It forms a very stable sludge cake with a water content of 40-60%.

This sludge cake falls on a truck parked under the press machine 6, is loaded as it is, and is conveyed to a predetermined place. In addition, since the treated water is sufficiently filtered, it can be discharged to the river as it is unless there is a special situation.

[0025]

EFFECTS OF THE INVENTION Since the present invention is constituted as described above, it is possible to form an extremely stable sludge cake having a water content ratio of 40 to 60%, which has been heretofore undesired, by adding only one addition treatment step. .

Further, by setting up a device in the sludge deposit area, it is possible to automatically perform a process from collecting sludge to forming a sludge cake as an integrated system, and it is possible to greatly save labor and cost conventionally required for sludge treatment. It is a thing.

[0027]

[Brief description of drawings]

FIG. 1 is a system explanatory view showing an example of a sludge processing device according to an embodiment of the present invention and showing processing steps from a sludge collector to a press.

FIG. 2 is a side view showing a vertical cross-section of the cover lid 24 in the expanded state of the suction mouse 21 which is also installed in the collector 1 and is further cut away.

FIG. 3 is a vertical cross-sectional side view showing the main part of the transfer pump 26 as well.

FIG. 4 is a vertical cross-sectional side view showing the main part of the separator 3 as well.

FIG. 5 is a side view in vertical section showing a main part of an ejector as an example.

FIG. 6 is a front view showing the relationship between the processing agent addition device and the slurry stirrer.

[Explanation of symbols]

 1 Sludge collector 2 Operation mechanism 21 Sludge suction mouse 22 Suction hose 23 Injection nozzle for excavating and crushing sludge 24 Cover of sludge suction mouse 25 Suction hole for sucking smashed and crushed sludge 26 Transfer pump 27 High-pressure water injection nozzle 28 Swirl injection nozzle 29 Transport hose 3 Separator 31 Tank 32 Filtration net 33 Upper suction hole 34 Storage tank 4 Treatment agent addition device 41 Slurry conveyance path 42 Inorganic treatment agent addition hopper 43 Organic treatment agent addition hopper 5 Slurry agitator 6 Press machine 7 Ejector 71 Swirl injection nozzle

[Procedure amendment]

[Submission date] May 21, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

To sludge from which solids such as stones and sand have been removed,
Aluminum sulfate 50-60%, sodium carbonate 20-30%,
Portland cement 3-8%, calcium carbonate 3-8
%, And an inorganic treating agent containing a mixture of 5% to 15% potassium hydroxide as a main component is added, the sludge component crystallizes into needles, and the eluate component to water is conjugated as a crystal body incorporating the sludge component.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

The inorganic processing agent is aluminum sulfate 50-60
%, Sodium carbonate 20-30%, Portland cement 3
~ 8%, calcium carbonate 3 ~ 8%, potassium hydroxide 5 ~
A powdery agent containing 15% mixture as the main component and fly ash, bentonite, or slaked lime added as a bulking agent is used. Have to be done.

Claims (3)

[Claims] 1. A sludge from which solids such as stones and sand have been removed is pressure-fed while stirring, and an inorganic flocculant, a neutralizing agent, and a sedimentation agent are added by an addition device provided in the pressure-feeding path. After the sludge component in the slurry was crystallized into needles and the pH was adjusted to 4 to 9, a polymer organic treating agent that binds the crystals into flocs was added, and this was dehydrated and condensed to form a sludge cake. Sludge processing method characterized by processing 2. An inorganic treatment containing a mixture of aluminum sulfate 50-60%, sodium carbonate 20-30%, Portland cement 3-8%, calcium carbonate 3-8% and calcium hydroxide 5-15% as a main component. Sludge treating agent consisting of an agent, a polyacrylic amide copolymer, and an organic treating agent comprising a mixture of an alkaline earth metal salt containing calcium chloride as a main component 3. A mouse for sucking sludge from the sedimentation site, a collector for collecting and removing sludge with a suction hose, a separator for removing solid matters such as stones and sand from the sludge, and a treating agent for the slurry from which solid matters have been removed. Sludge treatment device in which an addition device for adding a treatment agent and a press for dewatering and condensing a slurry to which a treatment agent is added are connected by a conveyance hose that conveys them while appropriately stirring them.