JPS5922956Y2 - Sludge dewatering equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an apparatus for dewatering muddy substances such as sewage sludge.

After adding organic or inorganic additives or organic and inorganic additives to the sludge generated in a sewage treatment plant to promote flocculation of the sludge, the sludge is sent to a belt screen press for dewatering. well known.

In the well-known belt screen press, the dimensions are
The sludge as shown below is supplied onto a water-permeable endless bell 1 which is placed horizontally by passing it through a plurality of guide rolls and is not subjected to any pressure. After dewatering the sludge using its own gravity, the sludge is
A plurality of guide rolls circumscribed and guided by this endless belt are sandwiched between the other endless belts being rotated, and the sludge caught between both endless belts is removed. and squeezing between a pair or more of pressing rolls placed inside each endless band and arranged facing each other, and a drum inscribed and bearing in one endless band and a drum inscribed in the other endless band. The sludge is compressed by the pressure belts 1 to 1, which are passed around a plurality of rolls, and the pressure belts sandwich the portion between which the endless belt of the -il is sandwiching the sludge, and transfer the sludge to the drum. Squeezing is done at the wrapped part.

This invention is more specifically based on the latter method, in which at least one of the two endless strips suspended between a plurality of guide rolls is made of a water-permeable filtration medium. At the same time, these two endless bands are circumscribed with each other to supply mud to the front of the traveling section driven in the same direction, and the mud sandwiched between these two endless bands is removed. A device that dewaters materials by squeezing them using a drum that is internally installed in one endless band and is supported by a bearing, and a pressure belt that is internally connected to the other endless band and is passed around a plurality of rolls. It is about improvement.

Examples of this type of belt press type dehydrator include Japanese Patent Application Laid-Open No. 51-123964 and Japanese Utility Model Application No. 52-10417.
No. 2 etc. have been disclosed.

In these belt press type dehydrators, at least one of the belts holding the sludge is not due to the tension of the pair of water-permeable endless belts itself, but rather a pressure belt I which is inscribed in one of the endless belts and is tensioned. - The sludge is strongly squeezed by the squeezing force acting between the belt and the drum.

Therefore, in this belt press type dewatering machine, there is no need to apply excessive tension to the water-permeable endless belt holding the sludge, so that the seaming part of the endless belt into an endless shape acts on the endless belt. This has the advantage that there is less risk of breakage due to tension, and in this type of belt press type dehydrator, the endless band holding the sludge is compressed between the pressure belt and the drum. It also has the advantage of being able to obtain a high dehydration rate.

In particular, as disclosed in JP-A-51-128964, when the pressure belt is composed of multiple belts, the water-permeable web wrapped around the drum is pressurized. It is also recognized that the belt has a particularly good dewatering rate because it has a large number of belts that are spaced apart little by little in the width direction.

However, the reality is that in these conventional devices, no consideration has yet been given to how the pressure bells 1 to 1 apply surface pressure in the direction of the drum.

In other words, the winding process of the pressure belt that seals the drum is
When the rotation angle of the drum is small, such as 90 degrees or less, the pressure applied toward the surface of the drum due to the tension of the pressure belt is equal to Since the curvature is small, it does not change much, so it is not a problem, but the winding stroke of the pressure bell 1- around this drum is 180 degrees in terms of the rotation angle of the drum.
When the pressure belt reaches L, the pressure applied in the direction of the drum surface due to the tension of the pressure belt increases because the curvature from the start end to the end of the inscribed part of the endless band increases. In this case, the applied force is small and reaches its maximum at an intermediate point between the two, but the pressure difference between them is quite large.

This means that the pressure belt works great for dewatering in the first half of the stroke when it is wrapped around the drum, but not as well in the second half. .

In addition, in the conventionally known belt press type dewatering machine, the pressurizing belt performs the entire pressurizing stroke from beginning to end with the same pressing area in the width direction of the belt, and permeates water while holding the sludge. Since the sludge was inscribed in an endless zone of sexual activity, at the moment when it entered this pressurization process, excessive squeezing pressure was suddenly applied to the sludge, and as a result,
In the early stage of the pressurization process, the water permeable endless band is likely to become clogged, resulting in poor water permeability and subsequent dewatering not progressing efficiently despite the large pressure applied. Live.

The problem inherent in the known Bell 1-press filter as described above has not been noticed by anyone until now, but this invention focuses on this point as well, and uses a pressure belt to move toward the drum. This paper proposes a method that allows for smoother and more efficient dehydration by rationalizing the pressurizing force.

That is, in the belt press type dewatering method as described above, the present invention has a plurality of pressure belts, and the plurality of pressure belts have a pressurizing effect on the muddy material. , divide the endless belt or the part wrapped around the drum into multiple stages in the running direction of the endless belt, and then change/add or change and add the position in the width direction of the endless belt in stages for each stage. This is what we propose to add to the list.

To explain the embodiment with reference to the figures, in Figs. 1 to 8,
an upper endless band 1 which is passed around guide rolls 3 and 4;
Guide roll 5. 6. 7. 8. The lower endless bands 2, which are rotated at an angle of 9° to 10, are partially circumscribed with each other, and the endless bands 1 and 2 in this embodiment are both made of water-permeable filtration media. There is.

Most of the mutually circumscribed parts of both endless bands 1 and 2 are wound around a drum 11 which is placed inside the upper endless band 1, and the shaft of this drum 11 is fixed at a predetermined position. It is rotatably supported by a bearing (not shown).

Of all the guide rolls 3 to 10 guiding the two endless bands 1.2, guide roll 3. 5. 6. 7.
9.10 are all supported by bearings (not shown) fixed in one predetermined position, but the guide rolls 4 and 8
The bearings are energized in the directions of arrows A and B in FIG. 1, respectively, and appropriate tension is applied to the two endless bands 1 and 2.

The upper endless belt 1 is connected to guide rolls 3 and 4 to this dewatering device.
The hanger is placed between the upper left side of the rotated part (the position indicated by arrow C), and the lower endless band 2 is placed between the guide rolls 8 and 9 at the upper right side of the rotated part (the position shown by arrow C). (position shown)
A feeding section for the chemically injected slurry is provided at one or both positions.

When the endless belt runs in the direction of arrow E, the slurry supplied onto the water-permeable endless bands 1 and 2 at the input section C and/or D position is suspended by the gravity of the slurry itself. It is filtered by water-permeable endless bands 1 and 2.

Therefore, below the gravity filtration zone, there is a filtrate receiving pan 12.
．． 13 are arranged.

The slurry thrown onto the device at the feeding section C and/or D position is sandwiched between the two endless bands 1 and 2, and then transferred to the drum 1.
Proceed to the pressurized zone wrapped around 1.

For this reason, the input for making the two endless belts 1 and 2, which are wrapped around each other and wrapped around the drum 11 with the mud sandwiched between them, run in the direction of arrow E is applied to the guide roll 10. It is now being carried out.

The guide roll 10 thus constitutes a drive roll in the device of this embodiment.

The drum 11 is supported so as to be freely driven as described above,
It rotates following the endless bands 1 and 2 wrapped around it.

Even with the belt press having the configuration described above, if a certain tension is applied to the two endless bands 1 and 2 by the guide rolls 4 and 8, respectively, the gap between the two water-permeable endless bands 1 and 2 can be applied. In the pressurized zone where the two endless bands 1 and 2 run around the drum 11, the muddy material that has been mixed in is dehydrated under pressure by the tension acting on the endless band 2 itself.

The feature of this invention is that when the two endless bands configured as described above run around the outer circumference of the drum 11 with mud sandwiched between them, the inner circumferential surface of the lower endless band 2 The purpose is to apply pressure in the following 11 directions.

Of course, it is already known that a pressure belt inscribed in the lower water-permeable endless band 2 acts on it, but the pressure belt of the embodiment according to this invention particularly has a plurality of strips. ■Bell) (15) O・(15) 1・(1
5) Consisting of 2・(15) 3, each V-belt (15) O・(15) 1・(15) 2・(15
) 3 is rotated by the following guide means and presses the inner surface of the lower endless band 2 toward the drum 11 with its outer peripheral surface by the tension applied to itself.

In other words, all V-belts aligned along the center of endless belt 2 (15) O・(15) 1・(15)
2. (15) Among 3, V-belts at both ends (15)
O. (15) 0, and the central V-belt (15) 1 is
The suspension is wound around the guide rolls 9, 20, 16, 17, and 10, and the rotated portion of the suspension is inscribed in the endless band 2 between the guide rolls 10, 9.

■Bell at both ends) (15) O and the V-belt between (15) 1, ■Bell) (15) O and (15)
) V-belts (15) 2 shorter than 1 are arranged so as to be arranged at equal intervals in the width direction of the endless belt 2, and are wound around guide rolls 18, 16, 17, and 10. , the portion of the hanging between the guide rolls 10 and 18 is inscribed in the endless band 2 between (15) 0 and (15) 1, respectively.

The V-belt (1) inscribed in the endless belt 2 in this way
5) In the gap formed between O. .1
The part where the hanger is turned between the 9 spaces is inscribed in the endless band 2.

Each V-belt (15) O・(15) 1・(15) 2
- (15) In order to rotate and guide 3 in this way, each guide roll 9, 10 and 16, 17, 18, 19 has the following:
The above ■bell l-(15) is attached to the required location on the outer circumferential surface of each
A V-groove is formed to surround O.(15)1.(15)2.(15)3.
0, the remaining outer circumferential surface on which the grooves are formed is inscribed in the water-permeable endless band 2, and presses the mud S sandwiched between the two endless bands 1 and 2 in the direction of the drum 11. The rotary position is set and supported so that it can also act as a press roll for dewatering.

Each of the above pressure belts (15) O.
In order to apply desired tension to (15) 1, (15) 2, and (15) 3, for example, each guide roll 2
Each bearing device of 0.18°19 is elastically biased in the directions indicated by arrows H, I, and J by a take-up device (not shown), and first the V-belt (15)
・(15) 1 The longest rotation section between the guide rolls 9 and 10 is inscribed in the endless band 2 and wound around the drum 11, and then ■ Bell) (15) 2 inscribes the longest rotation section between the guide rolls 9 and 10 into the endless band 2 It is inscribed into the endless belt 2 between the guide rolls 18 and 10 and wound around the drum 11, and finally the V belt (15
) 3 is wound around the drum 1 with the shortest rotation section being inscribed into the endless band 2 between the guide rolls 19 and 10.

During this time, each ■bell) (15) 0・(15)
1, (15) 2, (15) In this embodiment, the pressurized dehydration zone wrapped around the drum 11 until it collapses is a V-belt (1
5) 0.(15) Only the primary pressure zone P1 is inscribed in the water-permeable endless belt 2, and the V-belt (15)
A V-belt (15) 2 is added between O. (15)
1.(15) As the belt progresses to the tertiary pressure zone P3, in which the V-belt (15) 3 is further added and inscribed between 2, the pressure zones P1, P2, and P3 are The pressure applied to the sludge S sandwiched between the two endless belts 1 and 2 is gradually strengthened by adding the position and area to which the pressure is applied by the pressure V-belt. The system is designed to

In other words, in the first pressurizing zone P1, the mud S sandwiched between the two water-permeable endless bands 1 and 2 is
(15) Due to the sealing action of O (15) 0, the endless belt is kept in a state where it is prevented from protruding in the width direction, and at the same time, the V bell 1- (15)
1, pressure is first applied to an intermediate position in the width direction of the slurry S at a position in the width direction that does not adversely affect the sealing action.

In the second pressure zone P2, the V-belt (15) O.(1
5) The portion left after being pressurized in step 1 is additionally pressurized by V belt (15) 2, which acts between these
In the next pressurizing zone P3, the V-belt (15) 0.(
15) The parts left after applying pressure in steps 1 and 2 are these V-belts (15) 0 and (15) 1 and (15)
Additional pressure is applied by each of the bells 1-(15) 3 acting on the space between the two.

In the final tertiary pressure zone P3, each ■bell)
(15) 0・(15) 1・(15) 2・(1
5) Each V-belt (15) than the solid width a in 3.
It is preferable that the pressure belt be dense so that the gap β formed between 0.(15) 1.(15) 2.(15) 3 is smaller.

The cake that has been dehydrated in this way has two bells 1 to 1.
, 2 are guided in the direction of moving away from each other (taken out in an upright position) in FIG.

In the device of the above embodiment, both of the secondary endless bands 1 and 2 are made of water-permeable filtration media. Only band 2 may be water permeable.

In that case, the muddy portion may be introduced only at position D.

As in the embodiment detailed above, two endless bands 1
.
Its dehydration properties are improved.

That is, as shown in FIG. 8, the circumferential surface 11b of the drum 11
The circumferential surface around which the twisted endless belt 1 is wound is configured as a perforated plate in the form of punched metal, and more preferably, a bushing 23 of an appropriate height from the inner circumferential surface 11a is provided in each punch hole 22 on the drum 11. The bushing 23 is provided to protrude inward, and the filtrate drum 1 in each punch hole 22 is
1 to form an inward filtrate guide outlet.

When the drum 11 is composed of such a perforated plate,
The drum 11 is pressurized in each of the first to third pressurizing zones P1 to P3, and is passed through the water-permeable endless belt 1 from the muddy material S to the drum 11.
The filtrate discharged toward the surface of the drum 11 is immediately discharged toward the inner circumferential surface of the drum 11 through this punch hole 22, and flows out to the side of the drum 11 along the inner circumferential surface 11a of the drum 11. .

Therefore, the bushing 23 as described above is inserted into each punch hole 2.
When protruding from each of 2, use the pressure belt (15) 0
・(15) 1 ・(15) 2 ・(15) The filtrate discharged from the punch hole 22 by the pressure action of the guide rolls 9, 18, 19, 10, etc. permeates through the punch hole 22 and returns again. It is possible to prevent reflux toward the sludge, which helps in achieving good dewatering efficiency.

Further, punch holes 22 as described above are provided on the outer peripheral surface of the drum 11.
If the inner circumferential surface 11a of the drum is made to have a taper (not shown), the filtrate discharged in the direction of the inner circumferential surface 11a of the drum through the punched hole 22 will be able to pass through the inner circumference of the drum. This can ensure that the bottom of surface 11a is quickly discharged.

Of course, in the part where the mud is pressurized by the pressure belt inscribed in the lower water-permeable endless belt 2, the water-permeable endless belt 2
The filtrate filtered by passes through the endless belt 2 and exudes to the side of the pressure belt.

Therefore, if the pressure belt is
(15) O・(15) 1・(15) 2・
(15) When configuring with 3, endless band 2
Since the pressure is applied by the back side of this ■bell I・, that is, the wide side, the pressing force by the pressure belt is
It will be added to the water-permeable endless belt 2, that is, the filter cloth, without biting into it, and the exuded filtrate will quickly flow down the slope of this belt.
In the entire pressurizing stroke including the final end where the pressure by the pressure belt is released, the effect that the filtrate is cut very well can be obtained.

Further, in the above embodiment, the pressing force of the drum j111 toward the center of the muddy material S of (15) 0 and (15) 1 (especially (1!5) 1) is equal to the pressure of the guide roll 9.10. The pressing force toward the center of the drum 11 against the muddy material S of bells 1 to (15) 2 acts most strongly at an intermediate position between the guide rolls 18 and 10 (at the guide roll 19 position). The pressurizing force toward the center of the drum 11 against the slurry S in (15) 3 also acts strongest in the middle position between the guide rolls 19 and 10.

Therefore, in other embodiments, as shown in FIG.
Each flat belt (15) 0.(
15) 1・(15) 2・(15) To the back of 3,
One or more pressure rolls 25 or such rolls 25.25 are inscribed with a rotated flat belt (not shown) to press each flat belt more strongly in the direction of the drum 11. You can force it.

In still other embodiments, it is of course possible to subdivide the number of stages of reinforcement of the pressing force by the pressure belt to have more stages.

Further, in the above embodiment, there are three stages of pressure zones P1 and
The number of pressure belts that apply pressure at P2 and P3 is 2 for flat belt (15) 1 and 6 for flat belt (15) 2.
(15) 3 is exemplified as nine, but the number of flat belts is not limited to the above example, and in short, in something like this example, the pressure zone is different from Pl. As the process progresses step by step to P3, the total number of flat belts (15) 1, (15) 2, and (15) 3 is set to increase sequentially, and the pressurizing action of these belts is applied to the subsequent stages. It is desirable that the belt be strengthened in stages as the belt progresses.
1.(15) 2.(15) The arrangement position and number of endless strips 2 in the width direction of 3 may be appropriately selected depending on the dewaterability of the slurry S to be dehydrated.

Therefore, if the dewatering property of the muddy material is poor, as another embodiment, as shown in FIG. 111, 211, the same pressurizing action as described above may be applied repeatedly, or in another embodiment, as shown in FIG. As the drums pass around the three drums 311, 411, and 511 arranged in series, step by step,
Flat belts (15) 2 and (15) 3 may be added and inscribed in the space 1 to apply pressure that changes stepwise in a longer pressure zone.

Furthermore, - all of the above embodiments are examples in which the number of pressure belts is added in stages as the pressure zone progresses; however, in other embodiments, the number of pressure belts is As the process progresses, the rotational pressure action by the plurality of pressure belts is not added in stages as described above, but in the previous stage of the pressure zone, the pressure action by the plurality of pressure belts 1 is applied. may be added stepwise to different positions in the width direction, and may be added in the width direction in a later stage, and the first
2 to 14 show examples of such devices.

That is, as can be easily understood from the drawings, the device examples shown in FIGS. 12 to 14 differ from the embodiments shown in FIGS. 1 to 3 because of the first addition. In the pressure zone P1, a flat belt (15) 1 is rotated around guide rolls 9, 20, 18, and when it reaches the second pressure zone P2, a flat belt (15) is rotated alternately with this belt. (15) 2 is in the point that the hanger is turned to a position different from that of the flat belt (15) 1 in the middle direction of the endless belt 2.

From the second pressurization zone P2 to the third pressurization zone P3,
■Bell) (15) The hanging is turned by adding 2 pieces, but this point is similar to the embodiment described in detail earlier.

Above, the device of this invention has been described with reference to an embodiment, but as can be easily understood from the above, the dewatering device of this invention can remove the sludge caught between two endless strips. This device gradually increases the squeezing pressure and dewaters the mud by gradually changing the position of the pressure belt applied to the slurry around the drum, which is wrapped around the drum. In this method, by applying very partial pressure to a muddy material with a high water content, that is, by squeezing the water-permeable endless zone with good water permeability without significantly clogging it with the pressurizing bell 1~. The pressurized bell I maximizes the filtrate permeation effect in the non-contact area, thereby dewatering at a relatively low permeation pressure that does not cause clogging of the endless water permeable zone.
As the moisture content decreases as the pressure zone progresses to the latter stage, it is possible to filter on a different working surface, that is, a working surface that is not clogged due to contact with the pressure belt, or to increase the density of the pressurizing working area (total area). ) is used to activate the pressure belt, and the remaining mud from the previous stage is pressurized and dehydrated from the added position, so the pressure belt is applied from the previous stage to the latter stage of the pressurization process. During the process, the filtrate is exuded at a flow rate as uniform as possible,
It is a type of lacquer that allows for extremely smooth dehydration without clogging.

In particular, the device of this invention does not suddenly apply excessive pressure to the entire widthwise surface of the mud material at the beginning of the pressurizing stroke by the pressure bell I, unlike the conventional device. Like a device, the water-permeable endless band that acts as a filtration medium that holds the sludge in between can cause severe clogging at the beginning of the pressurization process, resulting in a decrease in dewatering efficiency in the subsequent pressurization process. There are no such drawbacks.

Also, in the part where the endless belt wraps around the drum,
As mentioned above, the pressure applied by the plurality of pressure belts which are applied to the endless belt by adding pressure application positions is the strongest, and the pressure applied in the direction of the drum by the tension of the pressure belt is the most powerful. Since the position where the pressure is applied in the direction of the drum is different in stages for each pressure belt, in this respect as well, according to the device of the present invention, the part where the mud is squeezed for dewatering is Not only is the pressure added sequentially, but the pressure applied to the area is also applied alternately and slightly changed in the rotational direction of the drum for dewatering. Since no water is added to the water, the dehydration effect is extremely smooth.

[Brief explanation of drawings]

Fig. 1 is a side view schematically showing the dewatering device according to this invention, and Fig. 2 a-1 shows two endless belts and three types of pressure belts individually taken out and wound around a drum. 3 is a developed view of the endless band wound around the drum and the portion where each pressure belt acts on the outer peripheral surface of the drum, and FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3. , FIG. 5 is a sectional view taken along line V-V in FIG. 3, FIG. 6 is a sectional view taken along line ■I-■■ in FIG. 3, FIG. 7 is a sectional view taken along line Vll-VII in FIG. The figure is a partially cutaway sectional view of the drum, Figures 9 to 12 are schematic side views of the dewatering device showing other embodiments, and Figure 13 is the embodiment shown in Figure 12, which is wound around the drum. A side view showing two filter cloths and four types of pressure belts taken out, Fig. 14 shows the endless belt wound around the drum in Fig. 12 and each pressure bell 1~ on the circumferential surface of the drum. It is a developed view of the working part. 1.2... Endless band, 3-10... Guide roll, 11
．． 111゜211, 311.411.511...Drum, (15) 0~(15) 3...■Belt (
Pressure belt), 16-20...Guide o-/l/, 22
... Punch hole, 23 ... Bushing, 25 ... Pressure roll, S ... Sludge.

Claims (1)

[Claims for Utility Model Registration] 1. At least one of two endless belts, each of which is passed around a plurality of guide rolls, is composed of a water-permeable filter medium, and A sludge supply device capable of supplying sludge so as to sandwich the sludge between two endless bands at the front stage of a running section in which the endless bands are circumscribed and driven in the same direction. and the part where the two endless bands are circumscribed with each other is inscribed in one of the endless bands in order to compress the mud sandwiched between the two endless bands. The processed belt is inscribed in the processed drum and the other endless band, and is clamped by a pressure bell 1~ which is rotated by a plurality of rolls, and the processed belt is pressed in the middle direction of the endless band. It is a dewatering device for sludge consisting of a large number of pressure belts arranged in a row, and the number of threads of the pressure belt I, which is inscribed in the endless belt, is as follows: A device for dehydrating sludge, characterized in that the amount of water is increased in stages in the running direction of the endless belt. 2. Utility model registration claim 1, in which each pressure belt constituting the multi-strip pressure belt is a belt.
Dewatering equipment for sludge as described in section. 3. The slurry dewatering device according to claim 1 or 2, wherein the drum is constituted by a perforated plate in the form of a punched metal.