JPS5947093A - Belt press type dehydrator - Google Patents

Abstract

PURPOSE:To enable the quick washing of filter cloths by a chemical soln. with less labor, by providing a washing section for filter closths with a chemical soln. in the mid- way of a turning route for a pair of the filter cloths which sandwich a material to be treated under pressure. CONSTITUTION:A pair of endless belt-like filter cloths 4, 6 are turned, and a material to be treated is supplied on the downstream of the turning sides of suction and dehydration sections 5, 13. The material is sandwiched under pressure by the filter cloths 4, 6 and is thus dehydrated. An immersion tank 15 is provided in the state of enclosing the lower turning parts of the filter cloths 4, 6 between such compression dehydration and shearing dehydration zones B and C, thereby constituting a washing section W. A chemical soln. tank 16 and a chemical soln. supply passage 18 from said tank to a tank 15 interposed with a pump 17 are provided and a recovering passage 19 for waste liquid is communicated and connected with the tank 15. The supply of the material to be treated is stopped, and the chemical soln. is supplied into the tank 15 so that a prescribed amt. thereof is stored therein. Thereupon, the filter cloths 4, 6 are immersed in the chemical soln. as they turn so that both filter cloths are washed simultaneously in a superposed state. The passage 19 is opened after the washing to recover the waste liquid of the washing.

Description

DETAILED DESCRIPTION OF THE INVENTION In the final stage 1, a pair of endless belt-shaped filter cloths are connected to each other in a state where the pressure of the object to be processed is detected at I! 111 Concerning freely provided belt press type dehydration 4&.

What about the above dehydrator? & Processing t1 Instead of dehydrating sludge mixed with slaked lime, depending on the nature of the contaminants, the contaminants can easily get into the filter cloth and are difficult to remove with washing water, resulting in clogging much faster. There was a problem in which the dehydration performance deteriorated. For example, in the case of slaked lime, the filter cloth is washed with a chemical solution depending on the nature of the contaminants, such as washing the filter cloth with a millet liquid. Conventionally, in general, the filter cloth was wound up on a roll, etc. and removed, and then transported to a cleaning tank using a crane, etc., or a chemical solution was artificially applied to the filter cloth during rotation of the filter cloth, and an auxiliary worker 4. Brushing etc. It is very time consuming and requires a lot of labor, and it also has the disadvantage that it takes a long time to open when the dewatering operation is interrupted, resulting in a decrease in the efficiency of the dewatering operation.

The present invention addresses the above point K4. r: The first objective is to make the cleaning part of the filter cloth using a chemical solution easier and faster.

Next, an example of the present invention will be described in detail based on illustrative drawings.

A mixing plate (:llll (i-provided with an endless strip of Once■ν
A suction dewatering section (6) is attached to the first filter cloth (4) V, and on the downstream side of the rotating force of the suction dewatering section (5), concentrated sludge is collected in cooperation with the second rotating filter cloth (61). Forced dewatering section (
71'5c is provided, and the first and second rotating filter cloths +41
, +61 times +K (↑, human waste, urban sewage, industrial wastewater, etc.) The belt is designed to continuously dewater the sludge and other materials generated in various water treatments such as industrial wastewater. It consists of a press type dehydrator.

The forced dewatering section (7) includes a straight path d
2 dehydration zone prisoners, pressure 1 secondary dehydration zone tBl of large arcuate path, and shear dehydration seam of meandering path: / (C1
, first and second rotating filter cloth +41, tel V
This is an invitation to gradually increase the clamping force.

The suction dewatering section (5) is constructed by attaching a first rotating filter cloth (4
) to guide the movement of the filter plate +81 and the desorbed liquid receiving tank (91
A closed space fs) is formed into a shape I by means of a filter, and a suction device f~00 such as a vacuum pump is connected to the closed space (81), and the sludge on the filter cloth (4) is suction filtered and dehydrated. It is.

The front L second rotary filter cloth (6) is connected to the forced dewatering section (7).
At a location having an upward slope in the running direction of the filter cloth on the side where the rotational force is improved compared to 1, there is a filter plate (++1) that guides the running of the second rotating filter cloth (6) and a desorbed liquid receiving tank (121). Connect the suction device (+01) to the closed space (S).
A suction dehydration section 0 (to) consisting of L is attached, and tlrl &! , is arranged to supply flocculated sludge from the mixer (3).

Between the compression dehydration zone IBI and the shear dehydration zone (CI), rolls Q41 and 141 rotate the filter cloths +41 and 61 downward, and the filter cloths +41 and A dipping tank (15) is provided to constitute one cleaning section.

A storage tank (+6) for the chemical solution is provided, and the storage tank θ~
From the immersion tank (over +5'l), a chemical solution supply path (I smell is provided, and the immersion tank 05) is connected to the waste liquid recovery path 09) with a pump 0~ interposed, and the material to be treated is supply-t
c--- Stop, supply the chemical solution to the immersion tank (15), and store it at the specified level. 71, and in that state, the filter cloth +41, [As 61 is rotated, both filter cloths are immersed in the chemical solution, and both filter cloths are +41, +
The 61i overlapping state is cleaned all at once, and after cleaning,
It is configured to open the drain liquid recovery path α91 and collect the cleaning drain liquid. Incidentally, cleaning brushes for the filter cloths +41 and +61 may be provided within the immersion tank so as to be freely driven and rotatable.

FIG. 2 shows another embodiment, in which the washing H1<(5) is configured by passing the iHl filter cloth (4) through the roll arm and ■ on one side in the longitudinal direction of the dehydrator, and the roll f2 on the other side.
11 and 211, the second filter cloth (61 is configured to rotate in one direction, and a dipping tank @ is provided surrounding each of the lower rotating parts thereof, and both dipping tanks +221, are attached to the ribs. , the chemical liquid supply path 08) from the chemical liquid storage tank θ and the drain liquid recovery path 09) are connected in communication, and both filter cloths (4) and D (6) are respectively immersed in the chemical liquid in separate soaking tanks I2z. It is configured to perform cleaning treatment.

FIG. 3 also shows another embodiment, in which the cleaning section (5) is constructed by arranging the open L1 end of the chemical solution supply path θ8) above each of the suction dehydration sections f51 and Q3i, and essentially Both filter cloths +41 and +61 are cleaned with a chemical solution by effectively utilizing the suction dehydration section (5) and the θ-drying force.
The cleaning drainage liquid is received by the receiving tank Ul (231), and the cleaning drainage liquid is received by the upper receiving tank (23 (the cleaning drainage from the tank is combined with the lower receiving tank) and the three-way valve C24), and then the dedicated cleaning drainage is carried out. The liquid is collected through the liquid collection path (width).

This configuration can also be applied when a gravity dehydration section is provided in place of the suction dehydration sections +51 and (+31).

@4 Figure also shows another embodiment, in which the cleaning section (5) is constructed by:
The chemical solution supply path (+11
), a chemical solution dropping device fte C2G+ for dripping and supplying the drug solution onto the filter cloths +41 and +61 is connected in communication, and the device is located on the downstream side of the dripping device l&f2fil in the direction of hemostasis, so that the brush can be driven and rotated freely. provided for, and
Below these, a receiving tank 128+ for receiving the washing waste liquid is provided, and a washing waste liquid recovery path (29) is connected to the receiving tank (to). As shown in FIG. 5, the brush &j may be attached at a predetermined distance to a pair of sprockets, □□□.

A roll Q41 is placed in each of the immersion tanks 0Fi) and 021,
Although not shown, the bearing part is provided outside (v(1) to prevent the adverse effects of the chemical solution.
It is something to do.

The above-mentioned collected cleaning waste liquid can be returned to the storage tank 06) and used for circulation, depending on the degree of contamination.

As a cleaning chemical solution, a desired one such as an acidic solution or V1 alkaline solution may be used depending on the properties of the object to be cleaned, such as cleaning slaked lime with a monoacidic solution.

[front], storage ()・]J ([AZ)ii-凋fig serve'
The i-path (18) may be heated in the direction of M'J'l~ to inscribe the contaminants in the reaction.

In summary, in the undeveloped JV, in addition to the above-mentioned belt press type dehydrator, there is a filter cloth cleaning section using a chemical solution in the middle of the rotation path of the filter cloth i41 and fGI (the second step is the chemical solution storage tank 06). from the washing part (medical solution supply path 08 to the shoulder), and a drainage liquid recovery path 09 from the washing part (5),
It is characterized by the provision of (ys (, 9).

In other words, while supplying the chemical solution to the cleaning section (W),
, (By rotating 6+, filter cloth +41,
+61 is cleaned with a chemical solution to decompose and remove the clogged contaminants, and the cleaning waste liquid is collected, after which the dewatering operation is restarted.

Therefore, when cleaning the filter cloth (41, 1 FIl) with a chemical solution, there is no need to remove or attach the filter cloth (F41, +61), and it is possible to eliminate dust and the need for workers to supply the chemical solution and brush. , requires less effort,
In addition, it can be washed quickly, and the interruption time for dehydration work associated with filter cloth washing can be shortened, making it possible to improve work efficiency.

[Brief explanation of drawings]

The drawings show an embodiment of the belt press type dehydrator according to the unreleased item ``11''. Map #!
FIG. 4 is a perspective view of essential parts showing another embodiment, and FIG. 5 is a side view showing a modified example of the brush. +41, +61...Filter cloth, [5), Q
3j...Suction dehydration section, 0υ, (2z...
・Immersion tank, (16)... Chemical storage tank, θ...
...Medical solution I1 (supply path, θ9), (251, (29
+... Drainage recovery channel, (2[i+... Chemical solution dripping device M, (w)... Washing section.

Claims (1)

[Scope of Claims] ■ A belt-press type dewatering system in which a pair of endless band-shaped filter cloths +41 and [61 are rotatably provided with the object to be processed being pressed between them, and the filter cloths ( 1) and (6), 6 filter cloth cleaning sections using a chemical solution are provided in the middle of the rotation path, and the cleaning section (chemical solution supply path 08 to the octopus) is provided from the octopus storage 4:,'V O6i, and the cleaning Part (Uli from ~■
A belt press type dehydrator characterized by a small liquid recovery path "LJle (251, 2 g)". ) is provided with a dipping 40α6 for immersing the filter cloth (4) in the chemical solution in the middle of the path in which the filter cloths (4) and (4) are rotated in a state in which the filter cloths (4) are rotated in a state of being offset. 3. ■ To compose the cleaning r::< (~ν), the song si
P In each rotation path L of both filter cloths (4) and (6), 01f
The dehydrator according to claim 0, further comprising a soaking device for dipping each of the filter cloths (4) and (6) in a chemical solution for 6 hours. A dehydrator according to claim 0. ■ To form 41 wash sections +X2, add 4 filter cloths
). (6) In order to supply the chemical solution to the suction dehydration section (hl. Dehydration L0 as described in section (■)