JPS59206100A - Process for dehydrating sludge - Google Patents

Abstract

PURPOSE:To perform dehydration of sludge inexpensively with a simple procedure by receiving the sludge in a vessel having dehydrating holes bored on its four side walls and bottom and forming passages of water around pieces of an elastic material having a specified shape which are mixed in said sludge. CONSTITUTION:After charging hydrous slurry 3 to a vessel 1, pieces of an elastic material i.e. grains of foamed polystyrene, are added to the sludge. Both are mixed by an appropriate method and allowed to stand thereafter for a fixed time. The water in the sludge oozes out successively from dehydrating holes 2 to dehydrate the sludge. Pieces of the elastic material 4 (i.e. grains of foamed polystyrene) added to the sludge 3 are compressed by the ambient pressure and form voids 4a around the grains. The water in the sludge accumulates in the voids and voids 4a are connected with other voids forming spaces like water passage. The water is discharged to the outside of the vessel 1 only through the dehydrating holes 2 communicating with the ends of the above-described water passages.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a method for dewatering sludge containing a large amount of water.

The following two methods are generally used as conventional methods for dewatering sludge.

(b) Current sea sludge, fiber sludge, etc. are mixed with lime powder and the water portion is absorbed by the lime to eliminate moisture.

(b) Waiting for natural dehydration.

However, in the method (a) above, the cost of lime powder is high, and it is difficult to dispose of the sludge after treatment. Also, the above (b)
method is too time consuming.

This invention was made based on these problems. That is, when an elastic material such as Styrofoam, which is discarded as waste, is crushed into small pieces and mixed into sludge, the Styrofoam pieces are sequentially compressed into the sludge, creating voids around the Styrofoam and causing the sludge to contain the styrofoam. Moisture aggregates. The system is constructed based on the idea that these voids communicate with each other one after another to form a water passage, and water that has aggregated around the Styrofoam is removed to the outside of the sludge through the dewatering holes. Next, an embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a container having dehydration holes 2 on four sides and at the bottom. As shown in FIG. 2, water-containing sludge 3 is put into this container 1, and then styrofoam particles as elastic pieces are added (third step), and then mixed by an appropriate method and left for a certain period of time.

Then, water in the sludge sequentially oozes out from the dewatering holes 2, and the sludge is dehydrated. That is, as shown in Figure 5,
The elastic pieces (styrofoam particles) 4 thrown into the sludge 3 are
The sludge is compressed by the surrounding pressure to form voids 4a around it, and in particular, as the water in the sludge coagulates, each void 4a is connected to form a kind of water passageway, and the sludge contacts the end of the waterway. Only water is discharged from the dehydration hole 2 to the outside of the container 1.

Since the present invention has the above-described structure, it not only has the effect of easily and inexpensively dewatering sludge, which has been difficult in the past, but also allows the sludge after dewatering to be effectively and appropriately used as a soil conditioner, etc. It has the effect of being able to

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a container having a dewatering hole in an embodiment of the present invention; FIGS. 2 and 3 are explanatory diagrams showing the process of charging sludge and elastic pieces into the container and mixing them; FIG. 5 is a diagram explaining the principle of this invention. l... Container, 2... Dehydration hole, 3... Sludge, 4...
・Elastic piece, 4a...Gap Patent applicant Hori 1) Kanjibe (3) Sai 4/Skidou 5 procedure amendment (method) % formula % 1, Indication of case Patent application No. 81109 of 1981 2 ,
Title of the invention Sludge dewatering method 3, Relationship with the case of the person making the amendment Patent applicant 5, Subject of the amendment Drawing 6, Contents of the amendment An engraving of the drawing (no change in content)

Claims (1)

[Claims] Sludge is stored in a container with a large number of dewatering holes in the four sides and the bottom, and then elastic pieces of appropriate shape and size are mixed in to form a passageway around the elastic pieces to drain water in the sludge to the outside of the dehydration container. How to dewater the sludge that is being discharged.