JPS5948680B2 - Solidifying agent for sludge or sludge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sludge or sludge solidifying agent that can solidify sludge or sludge to make it easier to handle.

As sludge or sludge, it has a high water content and is fluid, and disposing of it in that form is extremely difficult to handle and is strictly prohibited from the standpoint of preventing environmental pollution.

For this reason, sludge or sludge is solidified with a solidifying agent, and conventionally, quick-setting cement or aluminum sulfate added to this assimilating agent has been used, but cement has a moisture content of several thousand - If the concentration is extremely high, such as several hundred percent, it is difficult to solidify it quickly, and a large amount of cement is required, increasing processing costs, and cement and aluminum sulfate are often used together. The solidifying agent can harden sludge or sludge with a higher moisture content earlier than the solidifying agent of cement alone, and the hardness of the resulting hardened material is also comparable, but it still requires a large amount of use and is hardened even earlier. It is hoped that a sludge or sludge solidifying agent will be developed that will improve the hardness of the cured product.

The present inventors conducted research to find a solidifying agent that can quickly harden and aggregate high water content sludge or sludge with the addition of a small amount, and found that a solidifying agent consisting of water-soluble, nonionic polyethylene oxide and cement was found. Due to their mutual supplementation and synergistic effect, the above objectives are achieved, and the individual particles of sludge or sludge are transformed into a huge particle group, and this solidifying agent coats its entire surface, so that it is easy to treat the sludge or sludge. In order to complete the present invention, we obtained the knowledge that highly viscous sludge or sludge does not adhere to the equipment used in this treatment, such as a stirrer, and as a result, the treatment becomes easier. Ta.

The cement used in the sludge or sludge solidifying agent of the present invention includes Portland cement, alumina cement, mixed cement, and the like.

The amount of polyethylene oxide used is 0 compared to cement.
．． It is 1 to 3 wt%, preferably 0.1 to 1 wt%.

The amount of the solidifying agent for sludge or sludge of the present invention varies depending on the constituent materials of the sludge or sludge, its particle size, water content, etc., but it is generally added in an amount of 1 to 20 wt% based on the solid components.

If sludge or sludge is treated using the solidifying agent of the present invention, it will solidify the sludge or sludge in a small amount at an early stage. Furthermore, these particles will be agglomerated and the solidifying agent will cover the agglomerated particles, making it easier to treat and easier to process. The solidified product obtained thereafter is stable and will not collapse even if left for a long period of time.

If the solidifying agent of the present invention is used, solidification will occur without filtration, but if the water content is particularly high, solidification can be achieved in a short time by further filtration.

In this case, the effect of the solidifying agent of the present invention can be further enhanced by using polyacrylamide, which is known as a lacrimal aid.

Next, the present invention will be explained with reference to Examples, but the present invention is not limited thereto.

Example 1 The sludge to be treated was clayey sludge discharged from a stone crusher with a water content of 430%.

The solidifying agent used was a mixture of ultra-early strength Portland cement with 0.4 wt% of polyethylene oxide added to the outside.

This solidifying agent is added to the sludge in an amount of 2.5% by weight on the outside.
After adding the mixture and stirring well for 3 minutes, it was left to stand, and the supernatant liquid was poured out. When the resulting separated composition was observed, it stopped flowing at all in one day and completely solidified in three days.

Note that the water-cement ratio at this time was 3250%.

When the degree of solidification is shown using a Pikar needle according to JISR5201 cement physical test method, the penetration degree of the standard frame into the solidified material after 1 day is O, and after 3 days it is 21M in diameter.
The penetration of the starting frame (JISR, 9112 physical test regulations for plaster for ceramics) was O.

Further, when the solidifying agent and sludge were mixed and the resulting mixed composition was thoroughly stirred and vacuum dehydrated, the water content of the sludge decreased to 81%, and the dehydration properties were good.

When this was left to stand for 6 hours, the starting frame with a diameter of 2M became zero and it was recognized that it had completely solidified.

Comparative Example 1 The ultra-early strength Portland cement used in Example 1 was added to the sludge with a water content of 430% used in Example 1 on the outside.
．． 5% by weight was added, stirred thoroughly and left to stand in the same manner as in Example 1. When the mixed composition was observed, it did not solidify even after 3 days, and the 2M starter frame was completely penetrated.

In addition, sludge and ultra-early strength Portland cement were mixed according to Example 1, and this was dehydrated in vacuum, but the dehydration properties were poor and the water content of the sludge decreased only to 108%. It also did not solidify.

Comparative Example 2 A solidifying agent was prepared by adding 5% by weight of aluminum sulfate to ultra-early strength Portland cement, and adding 2.5% by weight of this to the same sludge used in Example 1. When treated according to the same method, the penetration of the standard frame for sludge was O after 1 day, but the 2M initial frame had completely penetrated and not solidified at all even after 3 days. Ta.

Furthermore, even when this mixture of solidifying agent and sludge was dehydrated in vacuum, the water content of the sludge was only reduced to 102%.

Example 2 0.4 wt% of polyethylene oxide was added and mixed on the outside of ultra-early strength Portland cement as an assimilation agent, and 5wt% was added on the outside of a sludge with a water content of 300% lifted from a port. and stir well for 3 minutes.

The water-cement ratio at this time was 1500%.

When it was left to stand for 8 hours, it stopped flowing at all, and the penetration of the standard frame was 0, and after 3 days, the penetration of the starting needle with a diameter of 211 gl1 was also 0.

Claims (1)

[Claims] 1. A solidifying agent for sludge or sludge, comprising cement and water-soluble nonionic polyethylene oxide.