JPH01143656A - Cleaning of sludge - Google Patents

Abstract

PURPOSE:To efficiently clean up foreign substances adhering to a sludge and separate miscellaneous materials by cutting or crushing the foreign substances adhering to a sludge with high pressure water. CONSTITUTION:In washing a sludge separated from a sand-accumulating pond with water, a sludge 20 is transported to a conveyer 18 from a chute 17 and cut and crushed by high pressure water 21. The resulting sludge is thrown to a cleaning water 12 in a cleaning bath 11 from the conveyer 18. Thus, the sludge 20 is loosened by jetting air 22 from a air-jetting pipe 19 as well as the flowing of the cleaning water following the jetting air, and miscellaneous materials such as metals and gravels are precipitated. Then, a sludge 20 floating on the surface area of the cleaning water is sent to stirring bath 14 to be rinsed and discharged from a discharging part 12b by a flight conveyer 13. As the result, foreign substance cleaning effect is increased and the separation of miscel laneous materials becomes efficient.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for cleaning dust (hereinafter referred to as sludge) floating in urban sewage, rivers, etc., using cleaning water.

[Conventional technology]

As illustrated in FIG. 3, conventional sludge washing means collects sludge scraped from a settling tank via a dust remover (none of which is shown) and receives washing water 2 via a held container 1. The washing water 2 is flowed by the stirring blades 4 to wash away foreign substances such as odor-producing substances, sludge, and dirt adhering to the surface of the residue. And the residue after cleaning.

It is scraped up by a cooler 5 equipped with a grid-like screen and supplied to a dehydrator (not shown) via a flight container 6, for example, to remove moisture.

[Problem that the invention seeks to solve]

The sludge scraped from the sedimentation pond mentioned above contains various miscellaneous items such as plastic products, paper, wood chips, cloth, etc. In particular, the sludge from the sedimentation tank intended for urban sewage contains lumps of filth. , sludge and other foreign substances that generate odors are attached, and there is a problem in that it is impossible to incinerate, let alone dry and dump as is. In particular, in the above-mentioned conventional cleaning means, since the lump-like dirt and the like simply circulate together with the cleaning water 2 in the stirring tank 3, they do not dissolve or suspend in the cleaning water 2 in a short period of time, and are The cleaning effect is significantly reduced. In addition, there are a large amount of fibrous strings, cloth, etc. mixed into the residue, which can get entangled with equipment and require time and effort to remove.
There is a problem that during cleaning, the cleaning agent gets tangled in a ball shape, impairing the cleaning effect.

On the other hand, there are lump-like impurities such as metal and gravel in the sediment.

Furthermore, contaminants such as bottles and metal containers are being mixed in, which has been increasing in recent years. This is because such contaminants often float near the surface of the washing water.

It is difficult to separate from the residue, and for example, it gets stuck between the grid-like screens that make up the dust remover 5, which not only obstructs the scraping action of the dust remover 5 but also causes overload. This may cause damage to the components. Furthermore, the metal,
Contaminants such as gravel remain at the bottom of the stirring tank 3 and are not scraped up by the dust remover 5, necessitating a major cleaning operation in which all of the washing water 2 is discharged.

The present invention solves the problems existing in the above-mentioned prior art, and provides a method for cleaning sludge that has a great effect of cleaning foreign matter adhering to the scum and also has the function of separating and removing impurities. purpose.

[Means for solving problems]

In order to solve the problems existing in the above-mentioned prior art.

In the present invention, in the method of washing the residue separated and removed from a sand settling pond or the like using washing water, there is a step of conveying and supplying the residue, cutting and cutting the supplied residue using high pressure water. Adoption of technical means including the steps of crushing/or crushing, washing and separating foreign matter adhering to the scum, settling out impurities mixed in the scum, and discharging the scum and impurities. That's what I did.

[Effect]

With the above configuration, foreign substances attached to the residue are cut or crushed by the high-pressure water, so that they can be easily dissolved or suspended in the washing water. Further, since the fibrous foreign matter is cut into small pieces and crushed by the high-pressure water, the cleaning action of the scum is promoted and the scum is prevented from getting entangled in the equipment. Furthermore, the above-mentioned cutting and crushing of the residue is carried out using high-pressure water.

Even if the residue contains impurities such as metals and gravel.

Unlike general mechanical cutting and crushing, there is no chance of equipment damage or failure.

〔Example〕

FIG. 1 is an explanatory diagram showing steps in an embodiment of the present invention. First, the residue scraped from a sedimentation tank (not shown) is pressed into a flat plate by means such as a reciprocating press or a rotary press (none of which are shown). By compressing the sludge, it is possible to crush or crush impurities such as bottles or metal containers mixed into the sludge, thereby promoting sedimentation and separation in the washing tank described later. It can also crush and finely divide lumps of dirt, sludge, and other foreign substances adhering to the residue, promoting dissolution into the washing water or Qf4.

Furthermore, by compressing the irregularly shaped residue into a flat plate shape of approximately equal thickness, handling in the primary process is facilitated, and
This makes it possible to easily and reliably perform cutting, crushing, and subdivision operations using high-pressure water, which will be described later. The residue pressed into a flat plate shape as described above is supplied to the cutting process via an appropriate conveying means. Next, in the cutting process, 3, for example, 1.0
00 kg/cn! The flat plate-shaped residue is cut, crushed, and finely divided by spraying high-pressure water of 0.2 mm in the form of a jet. In this cutting process, the fibrous strings and
Cloth etc. are cut or crushed as appropriate.

It releases the entanglement between the residues and further promotes the crushing and fragmentation of the filth, sludge, etc. Furthermore, on the downstream side of the high-pressure water jet in the cutting process.

Flattening and cutting, for example by using a high-pressure water jet capable of circular motion in a horizontal plane.

Since the crushed residue can be crushed again, subsequent cleaning can be made more efficient. Cut and/or
Alternatively, the crushed residue is sent to a residue washing process. In this sludge cleaning, for example, by using air agitation etc., the cut and/or crushed sludge is loosened and the filth is finely divided.

Sedimentation of impurities such as metal or gravel can be performed. Furthermore, for example, a slow stirring step (rinsing) may be provided after the residue washing step to more completely separate dirt, impurities, and the like. The above-mentioned sludge washing separates dirt and impurities, and floats the scum to the surface of the washing water.

Discharge it out of the system via a scraper or other means.

On the other hand, the so-called heavy contaminants such as metals and gravel that have settled during the above-mentioned residue cleaning and processing steps are discharged from the bottom of the cleaning tank to the outside of the system through an appropriate discharge means. Note that the washing water in which foreign substances such as filth and sludge separated from the sludge in the cutting process, sludge washing process, etc. are dissolved or suspended is sequentially discharged from the overflow weir of the washing tank, for example.
It is separately sent to a water treatment system and subjected to predetermined purification treatment. The residue discharged outside the system is subjected to, for example, dehydration treatment, and then incinerated or disposed of, or otherwise treated in the same way as conventional methods.

Next, FIG. 2 is a configuration explanatory diagram showing an example of an apparatus in an embodiment of the present invention. In FIG. 2, reference numeral 11 is a cleaning tank, which contains cleaning water 12.

The flight conveyor 13 is disposed so as to be freely movable in the longitudinal direction (the left-right direction in the second time). Discharge portions 12a and 12b are provided at both ends of the cleaning tank 11 in the longitudinal direction, respectively. Next, an inclined part 11a is provided at the bottom of the cleaning tank 11 on the discharge part 12a side, an overflow weir 12c is provided above the discharge part 12b side, and an agitation tank 14 is provided below the overflow weir 12c. will be made available for distribution. 15 is an air jet pipe, P
Provided at the bottom of the A stirring tank 14. Next, 16 is a sprocket wheel, around which the check 7 forming the flight conhair 13 is wound, and the flight conhair 13 is located below the stirring tank 14 in the cleaning tank 11, at the 1lJt inclined portion 11a.

Discharge part 12a, near the surface of cleaning water 12, and discharge part 12
A plurality of rods b are rotatably arranged as appropriate so that they can run endlessly. In addition, the above sprocket wheel 16
It goes without saying that at least one of the wheels can be used as a drive wheel to transmit power.

Next, a chute 17 is provided above the discharge section 12a side of the cleaning tank 11 to form a residue supply section.

A conveyor 18 is provided on the downstream side of the chute 17 so that it can run endlessly. Furthermore, the cleaning tank 1 on the downstream side of the conveyor 18
An air jet pipe 19 is provided at the upper part of the cleaning section 1 to form a cleaning section.

With the above configuration, the residue scraped from the two settling tanks (not shown) is removed by means such as a reciprocating press or a rotary press (
9, for example, into a square or rectangular flat plate, and from a chute 17 to a compressed hair 18.
supply to. The above flattened residue 20 is converted into Conhair 1
The high-pressure water 21 jetted from a plurality of nozzles (not shown) provided above 8 cuts, crushes, and divides the material into small pieces. The pressure of the true pressure water jet depends on the properties of the flat plate-shaped residue 20.

It should be selected appropriately taking into consideration dimensions, feed speed, etc.

It is preferable to set it in the range of 600-1, 500 kg/c+ll.

Note that the nozzle diameter, number of nozzles, etc. to be installed are appropriately selected depending on the state of the cleaning device. The residue 20 is cut and/or crushed as described above.

The water is poured from the container 18 into the washing water 12 in the washing tank 11 to perform washing. That is, the air 22 jetted upward from the air jet pipe 19 and the accompanying flow of the wash water 12 loosen the scum 20, and the dirt is dissolved or suspended in the wash water 12 by fragmentation. .

Further, the above-mentioned sludge 20 is loosened by the comb, and impurities 23 such as metals and gravel mixed in the sludge 20 are separated and settled in the washing tank 11. Note that the bottle 2, a metal container, etc., is crushed or crushed by the above-mentioned squeezing of the residue, so it becomes lumpy or flaky without containing air.

It is easy to settle into the washing water 12. Next, wash water 1
The sludge 20 that floats or floats near the surface of the cleaning water 12 is sent into the stirring tank 14 by the flow of the cleaning water 12 and is further rinsed. That is, in the stirring tank 14, the air from the air jet pipe 15 provided below causes the cleaning water 12 to flow in a clockwise direction, for example, as shown by the arrow.
In addition to rinsing the slag 20 beforehand, it is also possible to promote the floating of the scum 20 and the settling of significant impurities such as Kaneko 1 gravel. In this way, the cleaning water 12
Floating or floating residue on or near the surface of
0 is scraped toward the discharge section 12b by the flight conveyor 13 moving in the direction of the arrow and discharged. Further, the contaminants 23 that have settled at the bottom of the cleaning tank 11 are discharged from the discharge section 12a via the inclined section 11a by the flight conveyor 13. On the other hand, the purified water 12 is discharged from the overflow base 12c, but since foreign substances such as filth and sludge separated from the sludge 20 are dissolved or suspended in this washed water 12, a separate water treatment system is required. The water is then sent to a designated purification process.

In this embodiment, an example was shown in which the residue scraped from the settling tank was compressed in advance into a flat plate shape and then supplied.

Depending on the properties of the residue, the pressing step may be omitted.

In addition, the pressure, flow rate, nozzle diameter, number of nozzles, etc. of the high-pressure water used for cutting and/or crushing the residue should be selected appropriately, taking into consideration the properties, thickness, feed rate, etc. of the residue to be treated. be able to.

〔Effect of the invention〕

Since the present invention has the structure and operation as described above, the following effects can be expected.

(1) To cut, crush, and break up lump-like dirt or foreign matter mixed into or attached to the residue.

It can be easily separated from the residue.

Dissolution or suspension in wash water can be facilitated.

(2) Contaminants such as metals and gravel mixed in the residue can be separated by sedimentation, and containers such as 5 bottles can be crushed to increase their apparent specific gravity for sedimentation separation.

(3) Since strings, cloth, etc. mixed in the residue are cut or separated, accidents due to entanglement with structural members can be prevented, and maintenance and inspection are easy.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing steps in an embodiment of the present invention, Fig. 2 is a configuration explanatory diagram showing an example of an apparatus in an embodiment of the invention, and Fig. 3 is an explanatory diagram showing an example of a conventional scum cleaning means. It is a diagram. ll: cleaning tank, 13: flight conveyor, 14: stirring tank, 18: conveyor, 2o: sludge.

Claims (1)

[Claims] In a method for washing residue, the residue separated and removed from a sand settling pond or the like is washed with washing water, a step of transporting and supplying residue;
A process of cutting and/or crushing the supplied residue using high-pressure water, a process of washing and separating foreign substances attached to the residue,
1. A method for cleaning sludge, comprising the steps of settling impurities mixed in the sludge and discharging the sludge and impurities.