JPS61174907A - Treatment of filthy water - Google Patents

Abstract

PURPOSE:To permit quick treating work for filthy water using a simple device and inexpensive belt by use of a belt shaped filter cloth which is movable only back and forth and squeezing the filter cloth using only compressed air. CONSTITUTION:When untreated water is fed in a pressurized state from a water feeding pipe 14 to the inside of a dewatering vessel 1, treated water filtered by a filter cloth 2 and freed of sludge is collected in a water collecting chamber 11 and discharged from a discharging port 13. When above a specified amt. of cake deposits to the filter cloth 2, high pressure air is fed to the dewatering chamber 1, and the water in the filter cloth 2 is squeezed. Then, the filter cloth 2 is made free by opening a cover 12 of the dewatering chamber 1, and transferred by one cycle portion, i.e. corresponding to the area of the water collecting chamber 11, by a winding roll 23. The direction of the transfer is not always limited in one direction but is changeable optionally if necessary toward opposite direction. Also, the cake is scraped off with a knife 3 by the movement of the filter cloth 2.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for treating wastewater using a belt-shaped filter.

<Prior Art> Conventionally, there has been a sewage treatment method and treatment device called a belt press that uses a belt-shaped filter.

Compared to vacuum dehydrators, centrifugal dehydrators, filter presses, etc., these devices consume less power, produce dehydrated cakes with lower water content, and use less polymer flocculant.
Since it does not use slaked lime, it has the advantages of no increase in solid content, less auxiliary machinery, and easy maintenance.

However, the conventional belt press also has the following drawbacks.

(b) Since a long endless belt filter is used, it takes a long time to replace the filter.

(b) Since the belt is pulled over a long distance by applying force to both ends, a belt with a special structure is required. Therefore, extremely expensive belts must be used.

(c) The belt is more likely to wrinkle because it is pulled over long distances.

In order to prevent the occurrence of such wrinkles, it is necessary to provide a large number of rollers in the device, which makes the device complicated.

(d) Filter work is a structure in which the moisture is sucked out using a vacuum, and then the belt is crushed and squeezed using rollers.

Therefore, the structure becomes complicated and a long working time is required.

<Objective of the Invention> The present invention has been made to solve the above-mentioned problems, and therefore provides a method for treating wastewater that can quickly carry out treatment using a device with a simple structure and an inexpensive belt. The purpose is to provide

<Means for Solving the Problems> Next, an embodiment for solving the above problems will be described.

b) Dehydration container The dehydration container 1 is composed of a hopper-shaped water collection chamber 11 and a cover 12 that covers the upper part of the water collection chamber 11.

The cover 12 is configured such that the upper part of the water collection chamber 11 can be completely closed or opened, for example, like a hinged lid, by means of hydraulic or other mechanical forces.

In this case, between the collecting water chamber 11 and the cover 22, the filter cloth 2
As a result, the filter cloth is located in a direction transverse to the direction of movement of waste water.

A water supply pipe 14 for supplying untreated water to the dehydration container 1 and an air pipe 15 for supplying compressed air are connected to the cover 12, each with a valve.

The floor of the water collection chamber 11 is formed with a slope that gathers from the periphery to the center, and a discharge port 13 with a valve for discharging treated water is provided at the center.

mouth) belt filter The filter cloth 2 is constructed in a heald shape using a known material.

Then, clasps 21 are attached to both ends of the clasp 21.
A winding rope 22 is fixed to.

That is, the structure of the filter cloth 2 is a simple structure in which the clasps 21 are attached to both ends of a belt-like cloth.

Therefore, like a conventional belt filter, the edges on both sides in the longitudinal direction are fixed with leather along the entire length, and a complex structure is used in which a large number of continuous holes are opened for winding, like camera film. do not need.

The length of the filter cloth 2 is set to several times the length of the filter cloth 2 in the water collection chamber 11 in the traveling direction.

C) Reciprocating drive mechanism The filter cloth 2 of the present invention does not move only in one direction;
In particular, it is configured to reciprocate.

To this end, the winding roller 23 that winds up the rope 22 at both ends of the filter cloth 2 is constructed so that it can rotate at a rotational speed and move in both left and right directions.

2) The knife 3 is brought into contact with the knife filter cloth 2 outside the dehydration container 1.

This knife 3 is a cutting tool for scraping off the cake on the surface of the filter cloth 2, and since the filter cloth 2 moves back and forth, the dehydration container 1
Provided on both sides.

Next, the state of use will be explained.

b) Dewatering step The filter cloth 2 is sandwiched between the water collection chamber 11 and the cover 12 and fixed by applying pressure to both.

When untreated water is supplied under pressure from the water supply pipe 14 into the dehydration container 1, the treated water whose sludge has been filtered through the filter cloth 2 collects in the water collection chamber 11 and is discharged through the discharge port 13.

At this time, the valve of the air pipe 15 is closed.

(1) Squeezing process using pressurized air When a certain amount or more of cake adheres to the filter cloth 2, the pressure inside the container 1 increases.

When the increased pressure is detected, the valve of the water supply pipe 14 is closed, and at the same time, the valve of the air pipe 15 is opened.

Therefore, high pressure air is supplied to the inside of the dehydration container 1, and the moisture in the filter cloth 2 is squeezed out.

C) Moving the filter cloth The cover 12 of the dehydration container 1 is opened, and the free filter cloth 2 is moved by the winding roller 23 by one cycle, that is, by the area of the water collection chamber.

Therefore, a new portion of the filter cloth 2 can be used in the next cycle.

This moving direction is not one direction but can be freely changed to the opposite direction as necessary.

As the filter cloth 2 moves, the cake is scraped off by the knife 3.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be expected.

b) The filter cloth simply reciprocates horizontally or vertically.

Therefore, the structure of the filter cloth is simple enough to be pulled from both ends, and as a result, inexpensive filter cloth can be used.

Since the structure is simply to pull both ends of the filter cloth, there is no need for a large number of complicated roller groups as in conventional devices, making the structure of the device extremely simple.

c) Since both the device and the filter cloth have a simple structure, changing the filter cloth does not require any skill and can be easily done in a short time.

2) Since the filter cloth is squeezed using only air pressure, the work is faster and a large amount of processing can be done in a short time compared to the conventional method of suctioning with negative pressure and then compressing with a roller. It can be carried out.

[Brief explanation of drawings]

Fig. 1 2 An explanatory diagram of one embodiment of the apparatus used in the method of the present invention Fig. 2: An explanatory diagram of the structure of the filter cloth 1: Dehydration container 2: Filter cloth 11: Water collection chamber 12: Cover 1
4: Water supply vibe 15: Air pipe

Claims (1)

[Claims] A sewage treatment method in which a belt-shaped filter cloth is positioned so as to be reciprocally movable in a direction transverse to the movement of untreated sewage, and the filter cloth after the sewage has passed is pressurized with compressed air and then moved.