JPS6033237A - Use of sewage sludge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Conventionally, sludge soil accumulated in large quantities at sewage treatment plants has been incinerated by adding slaked lime to ash and disposed of in the sea or in depressions. The cost of slaked lime as an additive for incineration was high.This invention was developed by researching methods for effectively utilizing the large amounts of discarded sludge soil and selecting low-cost additives for incineration, and thereby improving civil engineering work. The plan was to obtain supplies that could be used for

Therefore, when alkali or sulfate is added to the residual 3Y slab, which is produced during iron manufacturing, it has a so-called hydraulic property that hardens even in water.

In addition, the above-mentioned sludge incineration ash is generally P. } Since it is a weak alkali of L8-9, it was found that hydraulic properties could be obtained by adding 4rt of ore to it.

This means that a substance with properties close to that of cement can be obtained.

Stone powder and t-selected.

Therefore, the results of an experiment in which hydraulic low-strength cement was obtained as a useful recycled material from the above-mentioned discarded sludge soil are as follows.

Example t Sludge soil water 10OCC (actual sludge ji 2 g)
Add and mix fine slag powder CQO7'Am5n (particle size below)/g~dag1 calcium carbonate stone powder IN Hiroshig and slaked lime aSg, add ferric chloride Sml as a dehydrating agent to this, dehydrate and dry. After that, the electric furnace j0/hour io
ol.

The cement was fired at 2000C to produce a fine powder of incineration ash.

Add 1% distilled water to this cement to create a soft linear Xt-, flow it into the concubine frame and leave it in the air for 2 hours, then put it in 27c of water and cure it.
The results of measuring the compressive strength are as follows.

One week later is Hair j 2 Same as above d Same as above 3 Same as above Hirotsu Same as above Example 2 Calcium carbonate stone powder/~4Ag and slaked lime ajg were added and mixed to sludge earth water tooCC (substantially 112 g of sludge), and to this was added chloride as a dehydrating agent. After adding double iron jag, dehydrating and drying, heat in electric furnace Lb i hour rmtr
oo'-t, 2oo1. r: 70 to 70% of the incinerated ash produced by firing to produce a fine powder of incinerated ash (CQO particle size of 7 um or less)
30% was mixed to produce cement. Distilled water aS% was added to this cement to create a soft wire state, flowed into the formwork and placed in the air for 2 hours, then λ
After curing in /'C water, the compressive strength was measured and the results were as follows.

One week later, Hiro (- Hiro) Same as above 112 Same as above SO Same as above The hydraulic low-strength cement produced in the above process is different from the large amount of sewage sludge soil that is discarded for 1 second, and is also low-cost and conventional. It is an epoch-making recycled material obtained by adding incineration additives, and can be widely supplied in large quantities to civil engineering works as an improvement hardening material for soft soil and as an auxiliary reinforcing material for road base materials.

that's all

Claims (1)

[Scope of Claims] (1 liter of sewage sludge soil water is mixed with fine slag powder, calcium carbonate stone powder, and slaked lime, a dehydrating agent is added thereto, dehydrated and dried, and then calcined in an electric furnace. Method for producing hydraulic low-strength upper membrane F. (2) Add and mix calcium carbonate stone powder and slaked lime to sewage sludge soil water, add a dehydrating agent to this, dehydrate it, dry it, and then fire it in an electric furnace. A method of manufacturing hydraulic low-strength cement by producing fine powder of incinerated ash and mixing it with fine powder of slag to which gypsum has been added.