JPS58215298A - Supply device of sludge to solid-liquid separator - Google Patents

Abstract

PURPOSE:To economize the amt. of the flocculating agent to be used, by connecting a conveyance and granulation mechanism having a conveyance screw mounted with plural spiral conveyance pieces at prescribed intervals to a revolving shaft to the downstream side of a charging tank for the flocculating agent and providing a scooping up mechanism on the downstream side of the conveyance and granulation mechanism. CONSTITUTION:A supply device of sludge to a solid-liquid separator 30 is constituted of a conveyance and granulation mechanism 1 having a conveyance screw 12 mounted with spiral conveyance pieces 10 at prescribed intervals D to a revolving shaft 9 connected to the downstream side of a charging tank 4 for a flocculating agent, a scooping up mechanism 20 of a long transverse width having scooping up pieces 26 which moves along the bottom part on the downstream of said mechanism 1, and a sludge discharge port 29 at the top edge in the bottom part of the mechanism 20. Thus the flocculating agent charged into the sludge is diffused uniformly thereon, whereby the effect of granulation is provided fully and the sepn. efficiency of the separator 30 is improved. Therefore, the amt. of the flocculating agent to be used in the tank 4 is economized.

Description

Detailed Description of the Invention The present invention relates to a sludge supply device that supplies sludge such as sludge to a solid-liquid separator. It is characterized by easy liquid separation.

It has been conventional practice to add a flocculant to muddy water or the like to cause the molecules f of mud to flocculate, thereby enhancing the solid-liquid separation effect. However, in the past, because the flocculant was simply added, it was difficult to fully utilize the flocculant's inherent flocculating effect. requires a large amount of flocculant to be added.

The present invention has been proposed in view of the above, and includes a conveying granulation mechanism consisting of a conveying screw in which a plurality of spiral conveying pieces are attached to a rotating shaft at predetermined intervals, and a case that houses the conveying screw. By providing a scooping mechanism connected to the downstream side of the tank and having a scooping piece that moves along the bottom on the downstream side of the transport granulation mechanism, it is possible to enhance the flocculant diffusion effect and improve the granulation process. The present invention aims to provide a sludge supply device to a solid-liquid separator that can fully exhibit its effects.

The configuration of the present invention will be explained below based on drawings of embodiments.

As shown in Figure I@1, the sludge supply device/according to the present invention has a flocculant input tank q adjacent to the metering unit 41!3 that receives the sludge flowing out from the pipes. l! Above the flocculant input tank q, the outlet of the flocculant input W6, into which a fixed amount of polymer flocculant is inputted, faces from tank j to n, and the agitator 7 faces inside the flocculant input tank d. It is. When the sludge flows into the flocculant input tank q from the coagulant input tank q, a fixed amount of flocculant is introduced into the flocculant input pipe.
Stirring can be performed using a stirrer.

A transport granulator atg is connected to the downstream side of the flocculant input tank q to diffuse the flocculant and to aggregate and granulate solid molecules in the sludge. The conveyance granulation mechanism g shown at 701 house j has a plurality of spider-shaped conveyance pieces io...
A conveying screw /2 is installed at predetermined intervals, and is provided with a plurality of stirring rods parallel to the rotation axis D so as to pass through the conveying piece 10, and the conveying screw /2. A horizontally elongated case /3 with a substantially U-shaped cross section that houses the screw /2, and a NIIJ that rotates the transport screw /2 in the row direction.
The drive source includes, for example, a motor with a speed reducer/'J.

Therefore, when the sludge flows into the case 3 from the flocculant input pipe 1, the sludge is sufficiently stirred by the stirring rod from the rotation of the rotating shaft 9, and the flocculant is mixed. After being sufficiently diffused, it is moved within the case/3 by the first conveyance piece 10α. The downstream portion of the first conveying piece 10a is the first conveying piece 1
Since 0Q and the second conveyance piece lOb are separated by the distance F!, the moving sludge is between the first conveyance piece 10a and the second conveyance piece 10h. Trade within #α. When the sludge remains, the solid molecules in the sludge are dispersed and become granular, producing a granulation effect.

Then, when the sludge from the coagulant input pipe q or ( is sent into the primary gap /6α by the first conveyor piece /IQ, the sludge sent earlier is pressed by the sludge sent from the pipe and moves downstream. On the downstream side of the gap/l, there is a second conveying piece 10.
h, the sludge pushed out from the gap 16α is sent to the downstream side of the second conveying piece 10h by the rotation of the second conveying piece toh. Since there is a gap /bb on the downstream side of the second conveyance piece ioh, the sludge moved by the second conveyance piece tab accumulates in the gap /4h. When sludge accumulates, solid molecules adhere to already aggregated lumps one after another due to the flocculant, or floating solid molecules aggregate to form new particles, as described above.

Then, the second conveyor piece toh rotates at the same time and the gap between the gauze and the grate is /6.
When the sludge is sent sequentially into b, the sludge that was sent first and accumulated is pressed by the sludge sent later and moves to the downstream side.

In this way, the sludge in 1 case/3 is transferred to the downstream side while being moved and accumulated by each transfer piece 10tl, 10h, 10c, etc. by the rotation of the rotation axis t, and finally flows down into the downflow gutter 1g from the opening /7 at the downstream end. In addition, while the sludge moves within the transport granulation mechanism g, it is kneaded by each transport piece 10...
Since the mixture is continuously stirred by the stirring rod/2, the diffusion effect of the flocculant is significantly enhanced. Therefore, the granulation effect can be reliably and sufficiently exerted.

As shown in Fig. 3, the downflow gutter /g is a vertical gutter whose width is widened toward the bottom, and inside thereof there are multiple diffusion plates /q in the upper and lower directions. A scooping mechanism 20 is provided at the lower end opening /g'. The diffusion plates /q widely disperse the sludge flowing down from the granulation mechanism g in the horizontal direction, and their base ends are fixed alternately to the opposing inner surface of the downflow gutter /g.
It has a shelf-like shape with the top surface slightly tilted downward toward the tip. Therefore, 1 g of sludge flows down from the transport granulation mechanism g.
As the sludge flows down, it hits each diffuser plate and spreads laterally, and flows down in the gap between the tip of the diffuser plate 19 and the inner surface of the downflow gutter. It flows down to the lifting mechanism KO. Note that if the upper surface of the diffuser plate /q is slightly inclined downward toward the left and right ends, the lateral dispersion effect can be significantly enhanced.

The scooping mechanism 20 includes a storage tank 22 whose bottom part has a semicircular cross section and whose width is equal to the width of the lower end opening ig' of the downflow trough /If, and is provided inside the storage tank 22. The sludge collected at the bottom 2/ of the storage slider is supplied to the solid-liquid separator. As shown in FIG. 4, the scooping wheel 23 has cross-shaped support rods, 1! r, 2! , and left and right support rods 2
S.

, 2! Horizontally long paper-cutting rollers with a cross-section shaped like a letter r are provided at intervals between the tips of r, almost parallel to the rotation axis 2≠.
A gap 27 is provided between the papermaking pieces 6 and 2 that face each other around the rotating shaft 2.

Therefore, when this papermaking wheel 23 is rotated in the direction of the arrow in Fig. 1 by the rotating source 2g, each papermaking piece roller...
rotates along the bottom, 2/, scoops up only the sludge accumulated on the bottom, 2/, and supplies it to the solid-liquid separator 30 from an oblong sludge discharge port 29 formed at the upper edge of the bottom, 2/. be able to. Note that even if the scooping wheel 3 is rotated, the void 2
The sludge present in the solid-liquid separator 3 is not scooped up by the scooping piece 2, so it is not supplied to the solid-liquid separator 3. Therefore, from the downflow gutter/g to the storage tank 2
The sludge that has flowed down into the sludge 2 is coagulated by the effect of the coagulant while it remains in the cavity of the scooping vehicle 23. Then, the sludge in the cavity 27 coagulates, gradually precipitates, and accumulates at the bottom 2/, whereupon it is scooped up by a scraping roller and supplied to the solid-liquid separator 30. As described above, since the scooping mechanism 20 has the cavity 27, the effect of the flocculant can be further enhanced, and the horizontally long scooping piece 2B can only remove the sludge accumulated at the bottom 2/. Since it is made by papermaking, the solid-liquid content is 11! Sludge can be uniformly supplied onto the r cloth of the a device 30.

Generally, the solid-liquid separator 3θ supplies sludge onto a rotatably driven cloth, leaving solids on the BP cloth, and liquids are P
The basic structure is to perform primary solid-liquid separation by passing through a cloth, and then dehydrate the solid material under pressure to perform secondary solid-liquid separation.

The solid-liquid separator 30 shown in FIG.
The lower P cloth 3:1 that is stretched on and rotates, and the lower P cloth 3
．． Sludge supply box 33 that supplies sludge onto 2
, a vacuum hopper 3 da that sucks and separates the moisture from the sludge on the lower f cloth 3, an upper f cloth that pinches the sludge on the lower f cloth 32, 7k, and both cloths 32, 3! The main roller 36 pressurizes and dewaters the sludge held by f.
and a pressure belt 37.

Therefore, the discharge port 2q is
The sludge discharged from the sludge is supplied to the surface of the lower P cloth 32 with a uniform thickness in the width direction by the sludge supply box 33,
υ-primary solid-liquid separation is performed by the vacuum hopper 3'1, dehydrated under pressure by the main roller 36 and the pressure belt 3, and 3 g of dehydrated cake with a low moisture content is discharged from the discharge port (not shown). ...It is closed and discharged.

As explained above, according to the present invention, a conveying granulation mechanism having a conveying screw in which a plurality of spiral conveying pieces are attached to a rotating shaft at regular intervals is connected to the downstream side of a coagulant charging tank,
On the downstream side of the transport granulation mechanism, there is a scouring mechanism with a sifting piece that rotates along the bottom, so that the flocculant introduced into the sludge is diffused into the tank and the granulation effect is improved. can be fully demonstrated. Therefore, the solid-liquid separation effect in the solid-liquid spectrometer can be improved more than ever.

Further, according to the present invention, since the flocculant's inherent flocculating effect can be fully exhibited, the amount of the flocculant used can be reduced by υ compared to the conventional method.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional front view, Fig. 2 is a sectional view of the conveying screw, Fig. 5 is a partially cutaway side view of the downflow gutter, and Fig. 4 is a partially cutaway side view of the downflow gutter. FIG. 2 is a partially cutaway perspective view of the paper-lifting vehicle. /...sludge supply device, g...flocculant charging tank, g
... Conveyance granulation mechanism, De... Rotating shaft, IO... Conveyance piece, lU... Conveyance screw, 13... Case, 2
0... Paper-picking mechanism, /... Bottom, 26... Paper-picking piece, Yude... Sludge discharge port, 30... Solid-liquid separation device.

Claims (1)

[Claims] A conveyance granulation mechanism consisting of a conveyance screw in which a plurality of spiral conveyance pieces are attached at predetermined intervals to a rotating shaft and a case that houses the conveyance screw is connected to the downstream side of the flocculant input, and conveyance granulation ( 2) Connect to the downstream side of the mechanism a long raking mechanism with a raking piece that moves along the bottom,
A sludge supply device for solid-liquid *qt comprising a sludge discharge port formed at the upper edge of the bottom of the scooping mechanism.