JPS5850196A - Dehydrating method - Google Patents

Abstract

PURPOSE:To perform highly efficient dehydration using small energy by fixing an end of an elastic filter bag to a base body, sealing water-bearing material to be treated and giving vibration and resonance to this system. CONSTITUTION:A base body 3 is installed on a base 1 vid spring 2 and a filter bag 7 which is capable of expansion and contraction in vertical direction is provided on the ase body 3, and the lower end of the filter bag 7 is fixed to the base body 3. Material to be treated such as sewage water, sludge etc. is selaed in the filter bag 7, and the base body 3 is vibrated by a vibration generating mechanism consisting of a motor 4 etc. Further, a system consisting of the base body 3, spring 2, vibration generating mechanism, guide 13, filter bag 7, and press body 11 is vibrated vertically by resonance frequency of the system. Energy extracted by resonance vibration is absorbed by the filter bag 7 and press body 11 and the material to be treated is compressed to generate strain. By this way, dehydration is effected by relative movement between liquid matters and solid matters, and filtered by the filter bag 7.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for dehydrating water-containing sludge, liquid-containing substances, etc. using normal vibration and resonance vibration. 6. Remaining after treating domestic wastewater and wastewater from factories As means for dewatering water-containing sludge and the like, a filter press method, a vacuum dehydration method, etc. are well known. The former method involves arranging filter plates and injecting treated water between the filter plates to perform compression dehydration, or the processing capacity is small compared to the size of the equipment.
Moreover, it has poor workability and requires a lot of manpower, and furthermore, it requires a large amount of energy per process, leading to high maintenance costs.

Furthermore, the latter vacuum dehydration method also requires a large amount of energy per unit treatment, has many failures such as clogging, has a complicated mechanism, and has problems in terms of maintainability.

By the way, in conventional mechanical engineering, research and development of technologies to avoid resonance and prevent the transmission of vibrations have been sufficiently conducted, but the reality is that no technology has been developed to utilize resonance phenomena. That is, if the resonance vibration is simplified and expressed in terms of principle, it becomes the following equation. In the following equation, M
is the mass of the vibrating system, S is the resiliency constant of the string, R is the resistance of the system, fo is the resonance frequency formula of the system, w(, is the angular velocity function of f, P is the external force on the system, and f is the external force The frequency of P, Q is the vibration expansion rate (corresponding to the conventional damping rate), and '-pA is the output generated by the system.

-0...■ Here, if f= is also given, that is, an external force P with a frequency equal to the resonant frequency of the system, an amplified output PA is obtained according to the value of Q as shown in equation 0. . As is clear from the formula 0, this output PA can be huge if S and R are appropriately controlled using an air spring or the like.

This invention is based on the above-mentioned principle of resonance, that is, it was made with the aim of using a simple mechanism called a vibration system and utilizing the physical phenomenon of resonance to efficiently extract a small amount of energy. A filtration bag that can be expanded and contracted is provided on the base, one end of the bag in the expansion and contraction direction is fixed to the base, and a press body is provided on the other end so as to be movable in the expansion and contraction direction, and the bag is equipped with a sewage slatch, etc. water content,
Enclose a liquid-containing object to be treated, vibrate the system consisting of the substrate, filter bag, press body, and object to be treated, and further vibrate in the expansion/contraction direction at the resonance frequency of the system.

The vibration energy amplified by the control of
(liquid contained) rests on the object to be processed, so it does not completely follow the vibration of the substrate and remains due to inertia), the press body collides with the object to be processed through the bag and pressurizes the object, and the bag It is designed to expand and contract to compress and strain the object to be processed, thereby achieving a highly efficient dehydration (removal) action with low energy consumption and good workability.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a base body 3 is provided on a base 1 such as a concrete floor via a spring 2, and a vibration generating mechanism consisting of a motor 4, a speed reducer 5, and an eccentric rotating body 6 is configured on this base body 3.
By driving this mechanism, the base body 3 etc. can be vibrated at an arbitrary frequency.

The base body 3 is provided with a filter bag 7 that can be expanded and contracted in the vertical direction.

In the case of the embodiment, the filter bag 7 is cylindrical and bellows-shaped, but the structure is not limited to this, and any bag that can be expanded and contracted in one direction may be used.

The lower end of the bag 7 serves as an opening for taking out the cake, and the end is fitted into the support hole 8 of the base 3, and the lower end of the bag 7 is inserted as a backing between the clamping plate 9 and the base 3, and the bag is removed. The lower end of 7 is fixed to the base 3 and sealed.

A sewage slatch introduction pipe 10 is introduced into the upper end of the filter bag 7 so as to be movable up and down, and the introduction part thereof is sealed, and a press body 11 is provided so as to be movable up and down. The vertical movement of the introduction tube 10 can be achieved by making the material flexible, for example, and even if it is not made vertically movable, the upper end of the bag 7 can be slid airtightly against the introduction tube 10 by keeping the introduction tube 10 immobile. You can also use it as Further, a shutoff valve 12 is provided in the introduction pipe 10 to improve the sealing inside the bag 7.

The press body 11 is movable only up and down by a guide 13 erected on the base body 3, and a hole 14 for passing the filtrate is provided in the plate-like portion thereof.

In the figure, 15 is a cover plate for preventing filtrate scattering, 16 is a hinge, 1
7 is a locking tool.

Note that the fold a of the bag 7 may be made double or otherwise to increase its strength.

Next, the operation of the navigation example will be explained.

First, after filling the filter bag 7 with an object to be treated, such as sewage slatch, the substrate 3 is
A system that vibrates together with the base 3, that is, the base 3, the spring 2, the vibration generating mechanism, the guide 13, the filter bag 7,
The system consisting of the press body 11 is vibrated in the vertical direction at the resonant frequency of the system. The resonance frequency dfo of this system is expressed by the above formula (■), where S is the spring constant of the spring 2, and M is the mass of the press body 11, the bag 7 (workpiece), the base 3, the vibration generating mechanism, the guide 13, etc. is the sum of

The large energy extracted by this expanded resonant vibration will either destroy the base 3 or destroy the base 1.
This applies large vibrations to the area, resulting in vibration pollution. However, in the case of this embodiment, the Okinawa bag 7 containing the object to be processed and the press body 1
1 acts in the direction of vibration damping, absorbs the amplified energy of the resonant vibration, and causes a large strain in the object to be processed, which has a large vibration loss, resulting in relative motion between the liquid and solid substances. Dehydration (removal of liquid) is performed by this process, and the water is filtered by a filter bag 7.

One of the vibration damping mechanisms in this case is that the water-containing/liquid-containing workpiece, which has a large vibration loss, and the press body 11 set thereon do not sufficiently follow the resonant vibration of the base body 3 and remain due to inertia. The other reason is that the object to be processed and the press body 11
This is because an opposite force is generated on the vibration surface of the base body 3 due to resonance of the vibration system.

In addition, in order to maintain effective dehydration (removal), the spring constant S1 resistance k must be controlled in accordance with the mass M of this vibration system, which changes as dehydration (removal) progresses, to achieve ideal resonance. Also obtain the frequency and the force magnification q. In this case, it is advantageous to use an air spring as the spring 2 because S and R can be easily controlled.

In addition, since the water content (liquid content) rate and viscosity of the material to be processed change as the dehydration (removal of liquid) progresses, the superposition of the press bodies 11 and the physical properties can be appropriately controlled (for example, water (e.g., by enclosing the liquid) to maintain vibration damping power and obtain a high dehydration (removal) rate.

After the dehydration process is completed, the holding plate 9 is opened as shown by the chain line in FIG. 1, and the cake is discharged from the opening at the lower end of the bag 7.

With this structure, the processing of dehydrated (deliquid) material is more efficient than the conventional press type or vacuum type. During its discharge,
When the bag 7 is vibrated, the clogging of the bag 7 can be easily removed, and the bag 7 can be completely discharged. Further, the work of washing the bag 7 can be carried out efficiently by sealing the washing water in the bag 7 and vibrating it.

+i In the above embodiment, the press body 11 and the bag 7 were not connected (integrated), but the same effect can be obtained even if they are connected, and the vibration is not caused in the vertical direction but in the lateral direction. The present invention can also be applied to a structure in which the bag 7 is expandable and retractable. Further, although the embodiments have been described for dewatering sewage sludge, etc., the present invention can of course also be applied to dewatering soybeans, so-called squeezing.

As described above, according to the dehydration method of the present invention, an expandable filter bag is provided on a base body, one end of the bag in the stretch direction is fixed to the base body, and a press body is attached to the other end side so that it can be moved freely in the stretch direction. A water-containing (liquid-containing) object to be treated, such as sewage slatch, is sealed in the bag, and a substrate, a filter bag, a press body,
The system consisting of the object to be processed is vibrated and further vibrated in the stretching direction at the resonant frequency of the system, and the amplified vibration energy causes the press body to collide and press the object to be processed through the bag. By expanding and contracting the bag, the material to be processed is compressed and strained, causing mutual movement between the liquid and solid substances, and the liquid in the material to be processed is filtered, resulting in highly efficient dehydration using little energy. (deliquoring) can be performed.

In other words, this invention involves the introduction of a material to be treated, dehydration (deliquification)
It is energy-saving in terms of operation, discharge of remaining sludge, backwashing of furnace cloth, etc., and has the effect of reducing malfunctions, increasing throughput, saving labor, and reducing equipment costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of an embodiment of the dehydration method of the present invention;
2 is a plan view of the main part of FIG. 1, and FIG. 3 is a bottom view of the main part of FIG. 3...Base body, 7...Filtering bag, 11...Pressed body Patent applicant Service Research Co., Ltd. Agent Kama 1) Text 2 Figure 1 1114 Figure 3 7 2 3 9 2 Procedural amendment (Discharged) November 10, 1982 Haruki Shimada, Commissioner of the Japan Patent Office 1 Indication of the case Patent Application No. 150106 of 1982 2 Name of the invention Dehydration method 3 Person making the amendment Relationship to the case Patent Applicant Address: 2-14-1 Shimizu, Asahi-ku, Osaka Name:
Service Research Co., Ltd. 4, Agent Showa Month, Day (Delivery date) Correct "Katsu efficiency" on the second line from the bottom of the third statement to "Kara efficiency".

Claims (1)

[Claims] A stretchable filtration bag is provided on the base, one end of the bag in the stretch direction is fixed to the base, and a press body is provided on the other end so as to be movable in the stretch direction, and the bag is filled with water-containing sludge, liquid-containing substances, etc. The system consisting of the substrate, the filter bag, the press body, and the workpiece is vibrated, and further vibrated in the 1111 expansion/contraction direction at the resonant frequency of the system, and the vibration energy and resonance are increased. The generated vibration energy causes the press body to collide and press the object to be processed through the bag, and the bag expands and contracts to compress and strain the object to be processed, causing relative motion between the liquid and the solid substance. , a dehydration method characterized by separating and filtering a liquid component of a material to be treated.