JPS5817900A - Treatment of sludge - Google Patents

Abstract

PURPOSE:To allow the water of sludge to evaporate of itself positively and to dehydrate the sludge with high performance by contg. the sludge in a shallow box placed specifically with hygroscopic sheets. CONSTITUTION:Sheets 3 of good hygroscopicity are laid on the bottom part 2 of a shallow box 1, and the circumferential edge parts 3a thereof are exposed largely to the outside of the box beyond the circumferential wall 4 of the box and are held suspended. Sludge A to be treated is contained in the box 1 and is left standing. Here, equally good results are obtaind by stacking plural pieces of the boxes 1, wherein the parts 3a are so stacked as to be not superposed on each other, to have good contact with the atmospheric air and to be well ventilated. The boxes are so placed as to receive direct sunlight over the longest possible time when weather is good. The water in the sludge wets the sheets 3, and goes beyond the wall 4 by capillarity and wets the parts 3a as well. From said parts, the water drops in the form of water drops and evaporates positively from the sheet surfaces on account of the contact with the atmospheric air, thereby dehydrating the sludge.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sludge treatment method for separating solidified sludge from wastewater such as industrial wastewater.

Sedimentation tanks are used as a means of removing solids contained in industrial wastewater.
There is a method in which a sedimentation tank (or a settling tank) is provided, sewage is stored in the settling tank, the solid content is settled out over time, and the sludge at the bottom is taken out and treated.

The sludge extracted here contains a considerable amount of water, and in order to remove only the solid content, it is necessary to heat the sludge or wait for the water to evaporate without heating. Methods such as injecting sludge under pressure and collecting the solid content by clogging a filter have been put into practice. However, the former has problems such as requiring a heat source and requiring a long time to warm up.
The latter has the disadvantage that processing capacity is limited due to mechanical processing, and requires a large amount of energy due to the use of power, resulting in high processing costs.

This invention solves the various problems mentioned above, and uses a hygroscopic sheet to actively naturally evaporate moisture when exposed to outside air. The aim is to provide a processing method.

Embodiments of the present invention will be briefly described below with reference to the drawings. At the bottom (2) of a shallow box (1), a sheet (3) with good hygroscopicity is left, and its peripheral edge (3a) extends over the box peripheral wall (4) and is left hanging to be largely exposed outside the box. , the sludge to be treated (6) is placed in a box and left alone. Here, it is possible to stack multiple boxes (1), but the peripheral edge of the sheet from each node (1) (
Sa) should not overlap each other as much as possible and should have good contact with the outside air and good ventilation. Naturally, when the weather is good, it should be exposed to direct sunlight for as long as possible.

By doing this, the moisture in the sweat mud moistens the sheet (3),
Due to capillary action, the water passes over the box peripheral wall (4) and becomes wet and droops at the sheet peripheral edge (3a). From this sheet peripheral edge ◇a), moisture falls in the form of water droplets and on contact with the outside air. Evaporation from the sheet surface is actively performed to remove moisture from the sludge to be treated.

It is also possible to make a part of the bottom surface (2) of the box (1) porous by covering it with wire mesh, etc., so that water can be dehydrated from the bottom surface of the box through the sheet (3). Ru.

Further, the sheet (3) is preferably used by laminating a large number of sheets of oriented sheet material, which has a high dehydration effect and is convenient for sheet reuse.

In addition, the peripheral wall edge of the box (1) has an edge (4) as shown in Figure 3.
It is preferable to add a), which has a high draining effect.

When the sludge to be treated is almost completely dehydrated and the solid content has solidified inside the box, the sheet (3) used to remove water is removed.
The sheet (3) can be used as it is to wrap the solid content in the box and taken out, or if the sheet (3) is to be reused, only the solid content can be taken out by another means.

As described above, according to this invention, the water in the sludge to be treated can be rationally removed by using a combination of a shallow box and a hygroscopic sheet, and sludge treatment can be achieved with extremely high efficiency even though it is a natural drying method. It is an excellent technical invention that can be widely used in various industries because it does not require any power, has low processing costs, etc.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram of the treatment box immediately after containing the sludge to be treated, FIG. 2 is a schematic diagram of the treatment box after the sludge has been dehydrated, and FIG. 3 This is a partial cross-sectional view of a box peripheral wall designed to improve drainage. (1)...box, (2)...bottom, (3)...see)
, (4)...box surrounding wall.

Claims (3)

[Claims] (1) Hygroscopic sheets are placed on the bottom of the surrounding wall of the shallow box inside the box and exposed over as wide an area as possible outside the box.
A method for treating sludge, which comprises storing sludge to be treated in a box, and drawing water in the sludge out of the box by wetting the sludge through a manual tube phenomenon and drying the sludge.・ (2) The sludge treatment method according to claim 1, wherein a part of the bottom surface of the box is formed into a porous surface so that water can be removed from the bottom surface of the box via a sheet. (3) The sludge treatment method according to claim 1, wherein the sheet is used by laminating a large number of grained sheet materials.