JP3311436B2 - Sludge treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for treating sludge, and more particularly to an apparatus for treating wastewater containing calcium, such as cement sludge in a ready-mixed concrete plant or a concrete product plant, or slag wastewater in an iron and steel smelter.

[0002]

2. Description of the Related Art In a ready-mixed concrete factory or the like, a large amount of sewage including cement and aggregate is generated due to washing of returned concrete, mixer trucks, washing of manufacturing machines, and the like. Conventionally, this sewage treatment is performed by separating and collecting an aggregate portion using a trommel or the like, and then reusing the remaining residue as kneading water, or separating and removing a cement component using a sedimentation layer, a filter press, or the like, and removing a solid component. And then neutralized with acid and discharged.

[0003] However, when the aggregate portion is recovered and water containing cement is reused as kneading water, there is a disadvantage that the strength of concrete is reduced. In addition, after the cement is removed, neutralization is performed. The discharge method has disadvantages in that the equipment and process are complicated and the cost is high.

[0004]

The object of the present invention is to recover solids as useful block-like solids from wastewater containing calcium such as cement sludge by using a very simple apparatus, and at the same time neutralize and adjust the pH of water. It is in a state where it can be released.

[0005]

In order to achieve the above-mentioned object, a sludge treatment apparatus according to the present invention comprises a supply means for supplying waste water containing calcium and a supply of carbon dioxide gas or carbonated water above a main body having a filter bed. In addition to the means, a circulation path communicating with the lower part in the main body and the means for supplying carbon dioxide or carbonated water is provided.

[0006]

According to the present invention, wastewater containing calcium, such as cement sludge, is separated into solids and water, and carbon dioxide or carbonated water acts on both of them, whereby the calcium in the solids is carbonated. Thus, the solidified product can be recovered as a useful solidified block, and the water is neutralized and adjusted so that it can be discharged.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. The sludge treatment apparatus 1 of the present invention comprises a main body 3 having a filter bed 2, a supply means 4 for wastewater containing calcium, a supply means 5 for carbon dioxide or carbonated water, and a communication means 5 for supplying carbon dioxide or carbonated water. A water discharge pipe 7 is provided below the main body 3.

The filter bed 2 partitions the main body 3 into an upper chamber 8 and a lower chamber 9 and filters sewage supplied to the upper chamber 8, and is made of a porous material. As the porous material, a water-permeable sheet, film, membrane, or the like may be placed or adhered to a perforated iron plate or the like, or an aggregate for concrete may be laid. When an aggregate for concrete is used, it can be used as it is as an aggregate of a solidified block.

The supply means 4 supplies sewage containing calcium from a sewage storage tank (not shown) by a pump means or the like. The supply means 4 comprises a pipeline communicating with the upper chamber 8 of the main body 3. It supplies carbon dioxide gas or carbonated water by a pump means or the like, and is composed of a pipeline communicating with the upper chamber 8 of the main body 3. In addition, circulation circuit 6
Is a device that repeatedly uses carbon dioxide or carbonated water.
The lower chamber 9 of the main body 3 is provided so as to communicate with the carbon dioxide or carbonated water supply means 5 via the pump means 10. Reference numerals 11, 12 and 13 denote valves provided on the supply means 4, the supply means 5 and the discharge pipe 7, respectively.

In the sludge treatment apparatus 1 of the present invention thus configured, the wastewater containing calcium and the carbon dioxide or carbonated water are supplied from the supply means 4 and the supply means 5 to the main body 3 as shown by arrows A and B, respectively. Is fed into the upper chamber 8 of the sewage, the sewage is filtered on the filter bed 2 and
And water 15. Here, the solid content 14 is solidified by carbonation of the calcium content in the solid content by permeation of carbon dioxide gas or carbonated water. The carbon dioxide gas or carbonated water also acts on the water 15 and is reused through the circulation path 6 while adjusting the pH of the water to neutralize.

Here, the wastewater containing calcium can be applied to various wastewater containing calcium in a form to be carbonated, such as wastewater produced from cement produced in a ready-mixed concrete factory and the like as a calcium source. In addition, waste gas from various combustion furnaces such as a boiler can be used as a carbon dioxide gas source. Further, by using a pressurized carbon dioxide gas of about 10 atm or less, it is possible to more effectively filter wastewater and carbon dioxide. Can be done.

The solidified material thus treated is recovered in blocks of several cm to several tens of cm, and although the strength varies depending on the amount of calcium carbonate to be contained in the sewage,
In addition to revetment blocks, it can be used for the same applications as various cement and concrete products. On the other hand, the neutralized water 15 can be discharged from the discharge pipe 7.

In the sludge treatment apparatus 1 of the present invention, a cement sludge having a solid content of 20% by weight generated in a ready-mixed concrete factory or the like as wastewater containing calcium was treated to recover a block-like solidified body having a thickness of 30 cm. , And a strength of 150 kgf / cm ² was sufficient for practical use.

[0014]

As described above, according to the present invention, wastewater containing calcium such as cement sludge can be treated by an extremely simple apparatus, and the solid content separation in the wastewater and the neutralization of the filtrate are simultaneously performed. In addition, the separated solid can be recovered as a useful block.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sludge treatment apparatus 2 Filter bed 3 Main body 4 Supply means of sewage containing calcium 5 Supply means of carbon dioxide gas or carbonated water 6 Circulation path 7 Discharge pipe 8 Upper chamber 9 Lower chamber 10 Pump means 14 Solid content 15 Moisture

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-53-126764 (JP, A) JP-A-57-204296 (JP, A) JP-A-5-329500 (JP, A) JP-A 55-204 47180 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C02F 11/00-11/20 C02F 1/66

Claims (1)

(57) [Claims] 1. A supply means for supplying wastewater containing calcium and a supply means of carbon dioxide or carbonated water provided in an upper part of a main body having a filter bed, and a circulation communicating with a supply means in the lower part of the body and said supply means of carbon dioxide or carbonated water. An apparatus for treating sludge, comprising a road.