JPS6233564A - Method and apparatus for treating contaminated grit - Google Patents

Abstract

PURPOSE:To upgrade treatment efficiency and to economically treat contaminated grit by disposing a separating body having many through-holes to a water surface part, introducing the scum-contg. contaminated grit into said body and oscillating the separating body in a vertical direction. CONSTITUTION:This invention relates to a treatment of the contaminated grit from a grit chamber, etc., in a pumping station and sewage treatment plant, in which part of the entire part of the separating body 3 having the many through-holes is disposed to the water surface part. This body 3 is oscillated in the vertical direction so as to be alternately positioned under and above the water surface. Then the water flow accompanying the bubbles B arises in the part of the through-holes 4a according to the oscillation and the contaminated grit S contg. the scum N on a separating plate 4 is washed by the water flow and is separated to the scum N and the grit S. The grit S in the through- holes 4a receives the water flow and the fine waste M and sand component S1 settle from the grit S when the plate 4 moves upward from the submerged state. Highly efficient and economical treatment of the contaminated grid is thus executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for treating sludge from a settling basin in a pumping station or a sewage treatment plant.

[Conventional technology]

In recent years, as lifestyles have improved, the proportion of coarse dust and organic components in domestic sewage has increased.

Along with this, waste materials such as bulky garbage with a heavy specific gravity and organic garbage containing scum tend to settle in the settling basins of pumping stations or sewage treatment plants, and the bottom of the settling basins tends to turn into sludge.

In any case, it is necessary to separate the dirty sand containing this type of sludge into bulky waste and organic waste and inorganic sand.

Incidentally, the components of the inflow water from the sewage settling pond are shown in Figure 7. Sedimentary sludge and floating sludge are classified for convenience, and the two are generally regarded as the same.

Conventionally, when treating sludge containing sludge, there has been a method in which the sludge is simply thrown into a draining hole or sand bed and discharged by simply draining the water, as shown in Figure 6. The sludge in the settling tank 50 is washed with water by supplying water (tap water or well water) to the cyclone 152 by the pump 51, and by agitating with air sent from the aeration blower 54 or by mechanical agitation. method is generally adopted. 55 is a sand discharger.

[Problem that the invention seeks to solve]

However, with the former method, which involves only draining water, the organic content of the highly organic sludge eventually decomposes, causing foul odors and dirt, causing secondary pollution, and is difficult to transport by truck in urban areas. It is.

In this respect, although the latter method has fewer of the above-mentioned problems, troubles such as clogging with scum etc. frequently occur at the outlet of the cyclone 52 and inside the piping, and a worker is required to constantly monitor this. If a blockage occurs, the pipe must be disassembled, which poses a major bottleneck in maintenance and management. On the other hand, in the sludge cleaning tank, the sludge containing about 80% of the sludge water is washed, but it requires a large amount of fresh water and is not economical, and the excess water (overflow water) is diluted and mixed. It is not possible to separate the sand from the residue etc. floating in the washed sand, and about 40 to 50% of fine waste remains in the washed sand without being able to be removed, so it cannot be said that the treatment is complete. Moreover,
This method requires too much equipment cost and operating cost compared to processing efficiency, even when looking at the equipment as a whole.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a highly effective and economical processing method and apparatus.

The first method of the present invention for solving the above-mentioned problems is to arrange a separator having a large number of through holes in a substantially horizontal direction on the water surface, and to feed dirty sand containing sludge from above into the separator. 1.
The separator is vibrated in the vertical direction so as to be alternately positioned below and above the water surface.

In addition, in the second invention method, a separator having a large number of through holes is arranged substantially horizontally on the water surface in the treatment tank, and waste sand containing sludge is introduced into the separator from above. The separator is vibrated vertically so as to be positioned alternately below and above the water surface, and a water flow is applied in a substantially horizontal direction between the sediment discharge means at the bottom of the treatment tank and the separator to remove fine waste. It is characterized by being discharged out of the treatment tank along with the water flow.

Further, the device of the present invention includes a separator having a large number of through holes and disposed substantially horizontally on the water surface and receiving sludge containing persimmons from above, and a separator that is connected to the separator, below the water surface and above the water surface. It is characterized by comprising vibrating means that vibrate in the vertical direction so as to be alternately positioned, and a skirt portion that extends downward from the separator around the effective separation portion of the separator and is always submerged in water. be.

[Effect]

In the present invention, part or all of the separator having a large number of through holes is placed on the water surface. As shown in Figure 2, this separated body 3
When it is vibrated up and down, a water flow F accompanied by bubbles Bi is generated in the through hole 4a portion due to the vibration. The filthy sand S containing sludge N on the separation plate 4 (FIG. 1) is washed away by a relatively rising water flow while the separation plate 4 is submerged under the water surface. In particular, the air lift effect of bubbles B effectively cleanses the skin. As a result, the residue N and the settled sand S are separated. On the other hand, in the process of the separation plate 4 moving from the submerged state to above the water surface, the filth S in the through-hole 4a part is moved by the entire relatively descending water flow, and at this time, the fine waste M and the filth separated from the filth S are The sand Sl begins to settle into the water along with the water flow. Since the residue N has a large diameter or is sticky, it remains on the separation plate 4 and is discharged from the end of the separation plate 4, for example.

According to the second invention, a horizontal water flow is applied below the separator 3 by, for example, the nozzle 13. As a result, as shown in FIG. 1, fine waste M and sand S settle through the through holes 4ai of the separation plate 4.

receives water flow. However, since the sand S1 has a high specific gravity, it settles as it is at the bottom of the treatment tank 1, whereas the fine waste M has a low specific gravity, so when the entire water flow is blown, it accompanies the water flow and is discharged out of the tank. be done. In this way, the coarse waste residue N, the fine waste M containing most of the organic content, and the sand S1 are efficiently separated.

Further, in the device of the present invention, a skirt portion 5 is formed for the separation due to the vibration described above. This skirt portion 5 defines an effective separation area and has the effect of strengthening the vertical water flow and air lift when the separator 3 is moved up and down. If there is no skirt portion 5, the effects of water flow and air lift will be small.

[Specific examples of the invention]

The present invention will be explained in more detail below with reference to specific examples shown in the drawings.

In FIG. 1, ``■'' is a processing tank, the bottom wall of which is inclined, and a sand settling and discharging machine 2 of, for example, a screw conveyor type is provided along the bottom wall.

The treatment tank 1 is filled with water W, and a separator 3 is provided on the water surface. The separator 3 includes a horizontally arranged separator plate 4 having a large number of through holes 4a at the bottom.

The left side (in FIG. 1) of the separation plate 4 is inclined upwardly to the left and floats above the water surface. Further, a skirt portion 5 extends downwardly surrounding a substantially horizontal portion of the separation plate 4.

After the dirty sand S containing residue N is placed on the separation plate 4, it moves to the left in FIG. 1 while being subjected to a separation operation. are arranged at intervals in the direction of movement of the dirty sand S and in a direction perpendicular thereto. 7
is a partition wall that partitions the periphery of the separator 3, and the skirt portion 5 except for the end in the transfer direction is integrated with this partition wall 7.

8 is a feeding chute, 9 is supplied waste sand S containing residue N
This is a dispersion gutter for dispersing in the width direction (direction penetrating the plane of the paper in FIG. 1), and is disposed above the starting end on the separating plate 4.

In this way, the dirty sand S is thrown into the starting end on the separation plate 4.

During this charging process, cleaning water is taken from the cleaning nozzle 10 for the raw dirty sand containing the residue N from the dirty sand input conveyor (described later). Here, the raw sludge containing sludge may be fed into the settling basin together with a large amount of sewage water by means of a mid-grain pump.

The entire separator 3 is substantially vibrated up and down by a vibration device to be described later. Here, the horizontal portions of the separation plate 4 are arranged in advance at positions that should be alternately located below and above the water surface in response to vibrations. By the operation accompanied by such vibration, the sand S1 and the fine waste M such as fine dust and sludge are settled through the through holes 4a of the separation plate 4 and separated from them. The residue N moves along the separation plate 4 to the left in FIG. A cleaning nozzle 11 is provided from the horizontal portion of the separation plate 4 to face the starting end of the inclined portion, so that the residue N is cleaned with cleaning water. The washed residue N is drained in the draining section 4b, which is always located in the atmosphere regardless of vibration, with a draining effect due to vertical vibration added, and the water falls into the tank 1. ``The drained residue N is discharged by a discharge conveyor 12 disposed close to the outside of the tank 1.゛Now, the sand S that settles into the water from the hole 4a! A horizontally oriented fine waste nozzle 13 is arranged between the separator 3 and the sand settling/discharging machine 2 to apply a water flow almost horizontally to the fine waste M. From this nozzle 13, water or air, or a mixture of the two, or instead of water, ozone water, water containing sodium hypochlorite, or the like is injected. As a result, the sand Sl, which is heavy in specific gravity, falls directly to the bottom of the tank 1, but the light fine waste M rides on the water flow generated by the nozzle 13 and heads toward the end of the tank 1,
It is discharged to the outside of the tank 1 from an outflow trough 15 partitioned by.

Sand S that has settled to the bottom of the tank! is scraped up by the sand discharger 2 and discharged to the outside of the tank. At this time, the fine waste M may still be attached to the sediment, so the final cleaning nozzle I6 is used to discharge the sediment. In addition, zl in FIG. 1 is a separation zone on the separator 3, z2 is a removal liquid washing zone, and z3 is a draining zone.

3 to 5 are side views of the entire processing apparatus, in which 17 is a dirty sand input conveyor, 8 is a vibrator, 9 is a spring, and 20 is a sand discharge port.

By the way, the material of the separation plate 4 can be metal, resin, fiber, etc., and the through hole is A? It can be formed into an appropriate shape such as a punch hole, a conical hole, a net shape, or a slit shape. The diameter is appropriately selected depending on the separation efficiency, but preferably 2 to 101 LII.

The swing width t of the separating plate 4 is preferably about 3 to 10 JEI per side. Skirt length is 30-80mm, especially 50-60fi
is preferred. Further, in place of the jamming plate 6, it is also possible to take the residence time by using a continuous S-shaped path.

〔Effect of the invention〕

As described above, according to the present invention, coarse valve residue, fine waste mainly composed of organic components, and sand can be effectively separated, and there is no problem such as operational blockage. In terms of equipment, there are advantages such as separation can be achieved with one device.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of the present invention, Fig. 2 is an explanatory diagram of the separation principle, Fig. 3 is a front view of an example of the device of the present invention, Fig. 4 is a plan view, Fig. 5 is a side view, and Fig. The figure is an explanatory diagram of the prior art, and FIG. 7 is an explanatory diagram of components in inflow water. DESCRIPTION OF SYMBOLS 1... Processing tank, 2... Sand discharger, 3... Separator, 4... Separation plate, 4a... Through hole, 5... Skirt part, 12... Discharge conveyor, 13... Nozzle, 15
... outflow trough, S... sewage, N... sludge, M.
...Fine waste, St...Sand, W...Water. Figure 1 Figure 2 Figure 5 Figure 6 Figure 7 Procedural amendments dated September 5, 1984

Claims (4)

[Claims] (1) A separator having a large number of perforations is arranged substantially horizontally on the water surface, sewage containing sludge is poured into the separator from above, and the separator is placed under and above the water surface. A method for disposing of dirty sand characterized by vibrating it in the vertical direction so as to alternately position it. (2) A separator having a large number of perforations is placed substantially horizontally on the water surface in the treatment tank, waste sand containing sludge is introduced into the separator from above, and the separator is placed under the water surface. and vibrate vertically to alternately position them on the water surface,
A method for treating sludge, comprising: applying a water flow in a substantially horizontal direction between the sediment discharging means at the bottom of the treatment tank and the separator, and discharging fine waste along with the water flow to the outside of the treatment tank. (3) A separator that has a large number of holes and is placed substantially horizontally on the water surface and receives the waste sand containing residue from above, and this separator is placed alternately below and above the water surface. What is claimed is: 1. A device for treating dirty sand, comprising: vibrating means for vibrating vertically as much as possible, and a skirt portion extending downward from the separator around the effective separation portion of the separator and always being submerged in water. (4) Always present in the atmosphere at the horizontal end of the separator,
The waste sand processing apparatus according to claim 3, further comprising a drainage section for removing water in the residue transferred from the effective separation part of the separator.