JP2002035794A - Apparatus for concentrating sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for concentrating sludge which is low in costs including a running cost due to curtailed structure, miniaturization, and reduced power consumption. SOLUTION: In the apparatus, a water absorbent cushion is contacted continuously with a sludge water surface, after water in sludge is absorbed enough, the cushion is squeezed to discharge water outside, the sludge is vibrated so that suspended solids in the sludge are gravity-separated, and the treatment efficiency is improved by increasing the water concentration of a sludge surface layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for efficiently removing water from sludge mixed with high concentration of SS and concentrating the sludge.

[0002]

2. Description of the Related Art Conventionally, when sludge is discarded, it is necessary to concentrate the sludge to reduce the volume, and a method of separating SS using a filter press for centrifugally dewatering by pressing into a filter cloth bag is known. Generally exists.

[0003]

The prior art has the following problems. (A) The mechanism is complicated and requires a large amount of power, so that the cost is high. (B) Installation space is large, and moving and assembling are expensive. (C) It is suitable for a large-sized processing plant, but when the size of the apparatus is reduced, the cost increases and the apparatus is not suitable for a small-sized facility. That is, the conventional technique has many problems such as a large installation area, a high cost, and a lack of a complicated device management technique. In particular, the treatment of sludge water generated in civil engineering works and the like is indispensable to society, and there is a need for a low-cost and high-efficiency treatment apparatus.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a sludge concentrating apparatus which is space-saving, cost-saving and simple.

[0005]

Means for Solving the Problems In the present invention, a water absorbing body which absorbs water by capillary action is attached to a rotating drum or a caterpillar-shaped conveyor, and after absorbing water in the sludge surface layer by the water absorbing body, the water inside the water absorbing body is absorbed. This is a sludge concentrator that squeezes water out of the sludge. Also, by applying vibration waves to the sludge tank with a vibrator, a liquefaction phenomenon occurs in the SS of the sludge tank, and by increasing the water content of the sludge surface layer, a high-efficiency sludge concentrator that increases the water absorption efficiency of the water absorber. It is.

[0006]

Embodiment 1 FIG. 1 shows a caterpillar type sludge concentrator. The water-absorbing body (11) is made of sponge, felt-like cloth, etc.
It is preferable to use a material that easily causes a capillary phenomenon.
Caterpillar type conveyor driven by motor ▲ 1
At 6), a cushion-shaped water absorbing member (11) is attached, and this is rotatably arranged in a predetermined shape by a plurality of supporting rollers (12).

[0007] One end of the conveyor (16) is arranged so that the water absorbing body can come into contact with the sludge in the water tank, and the other end is arranged outside the water tank so that the water absorbing body can be squeezed by the squeezing roller (13).

[0008] The water absorbing body [11] by the squeezing roller [13]
▼ Water squeezed out from the water tank outside the water tank ▲ 14 ▼
The supporting roller (12) and the squeezing roller (13) are arranged at predetermined positions so that the droplets are dropped.

Since the water absorbing body (11) may be consumed due to the pressure of the throttle or the friction with the sludge or the roller, the water absorbing body (11) is put in a bag in advance and the bag is attached to the conveyor (16) to reinforce the water absorbing body. In addition, it is possible to easily replace the water absorbing body. A net or the like can be considered as a material of the bag (23) for containing the water absorbing body.

The water absorber (11) moves the sludge surface layer in a direction parallel to the water surface by the conveyor (16), and at this time, the moisture of the sludge is absorbed into the water absorber by capillary action. The water-absorbing body that has absorbed the moisture is led to the outside of the sludge tank by the conveyor, and is crushed at a predetermined position by the support roller (12) and the squeezing roller (13). As a result, the water in the water absorbing body is squeezed out and drops into the water receiving tank (14). The above-described series of movements are continuously performed while the conveyor (16) is driven by a motor or the like. It is also conceivable to support the conveyor in the sludge tank with a float (15). This makes it possible to always give the best draft to the water absorber following the change in the sludge water level, and at the same time, it is possible to effectively utilize the sludge tank volume.

[0011] As the concentration of the sludge proceeds, the water absorbing body (11) moves on the sludge-formed sludge surface, and there is a possibility that the water absorbing body or the water absorbing body bag (23) is clogged with the concentrated sludge. In order to solve this problem, a part that may come into direct contact with the concentrated sludge is composed of a smooth surface material such as vinyl, and a shark gill-shaped slit (21) is provided in this part to reduce the water content of the water absorber. Consideration can be given to preventing absorption.

[0012]

Description of Embodiment 2 In the above embodiment, the water absorbing member is moved by a conveyor chain or the like, but a method using a rotating drum is also possible. An example is shown in FIG.

The absorber (11) is attached to the outer periphery of the rotary drum (17) in the form of a water turbine blade, and the absorber can be moved in a pendulum around a fixed side as a fulcrum. By the rotation of the drum (17), the absorber comes into contact with the sludge to absorb the water of the sludge, and then is crushed by the squeezing roller (13), and the water is dropped into the water receiving tank (14). Thus, the same effect as in the first embodiment can be obtained. At this time, the rotation of the drum may be clockwise or counterclockwise.

[0014]

Embodiment 3 Next, an embodiment in which a vibrator is attached to a sludge tank will be described.

FIG. 3 shows an example in which a vibrator is attached to a sludge water tank.

In the sludge introduced from the raw water inlet, a vibration wave generated by a vibrator in the sludge tank acts on the SS of the sludge, causing a so-called liquefaction phenomenon.

FIG. 4 shows a model for separating SS and water by the liquefaction phenomenon. Due to the liquefaction phenomenon generated in the sludge, solid-liquid separation of SS and water in the sludge is promoted.
S sinks, and the water concentration in the surface layer is thereby increased.

Since the SS and the water are separated by the vibration wave and the water concentration in the surface layer of the sludge is increased, the water absorption efficiency of the water absorbing body is increased, and the sludge concentration treatment speed is increased.

As a result, the SS is consolidated by its own weight,
At the bottom of the sludge tank, it can be expected that the sludge has grown to a considerably high concentration.

A screw conveyor is provided at the bottom of the sludge tank, and the concentrated mud can be transferred to the outside of the tank by driving a motor.

The screw may be operated at all times or at appropriate times. A valve for preventing outflow of waste water is fixed to the tip of the screw conveyor by a spring, and the valve acts on the sludge discharge port at the tip of the conveyor by spring pressure. As the concentration of the SS proceeds, the concentrated sludge is extruded by the screw, and the extruded sludge is discharged to the outside of the tank by an amount that exceeds the spring pressure.

When the concentration of the sludge is low, the sludge has a high fluidity and only disperses and circulates in the tank even if a screw acts, and does not flow out to the outside by pressing the spring pressure. By providing a mechanism that can adjust the spring pressure, the discharge concentration of the concentrated sludge can be adjusted. Sludge can also be discharged by simply opening and closing a so-called commercially available valve instead of opening and closing the valve by spring pressure.

[0023]

According to the present invention, the following effects can be expected. (A) Since the mechanism is omitted, the cost is reduced. (B) Small devices can be provided at low cost. (C) Since the power is small, the lining cost is small.

As described above, the problems of the conventional sludge concentration treatment technology can be efficiently solved by the effects of the present invention.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a sludge concentrator according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of a sludge concentrator according to Embodiment 2 of the present invention.

FIG. 3 is an explanatory view of a sludge concentrator according to Embodiment 3 of the present invention.

FIG. 4 is an explanatory diagram of a liquefaction phenomenon.

FIG. 5 is an explanatory view of a water-absorbent bag.

FIG. 6 is an explanatory diagram of a configuration of a water absorbent bag.

Claims (4)

[Claims] 1. A plurality of cushion-like absorbent bodies that move like a pendulum with one side serving as a fulcrum are attached continuously or in a scale to a water-absorbing body moving mechanism such as a chain conveyor or a rotating drum, and the sludge water surface is driven by driving this mechanism. A sludge concentrator characterized in that the sludge is concentrated by bringing the water in the sludge into contact with the water absorber and absorbing the water in the sludge by the capillary phenomenon, and then squeezing out the water in the water absorber. 2. A float is attached to a moving mechanism of the water absorbing body, so that the water absorbing body is vertically interlocked with the water surface and follows the displacement of the sludge water surface so that the water absorbing body comes into contact with the sludge at a constant draft. A sludge concentrator characterized in that it can be obtained, and the sludge concentrator according to claim 1. 3. A sludge concentrator having a mechanism for vibrating a sludge SS in a tank by applying vibration to the sludge by a vibrator or the like, and promoting a solid-liquid separation by a liquefaction phenomenon caused by the vibration. 3. The sludge concentrator according to claim 1. 4. A water absorbing body which is made of a smooth surface material such as a vinyl sheet to prevent obstruction of the water absorbing body by the sludge, or by providing a shark-like slit on the smooth surface. Absorbent body or absorbent body bag that is designed not to prevent water absorption.