JPS5830381A - Treatment for incineration ash of sewage sludge - Google Patents

Abstract

PURPOSE:To obtain aggregate of high strength by adding waste org. liq. to the incineration ashes of sewage sludge and granulating the ashes then calcining the granules. CONSTITUTION:In a method of adding waste org. liq. to the incineration ashes of sewage sludge and granulating and calcining said ashes, the waste org. liq. is added to said incineration ashes so as to adjust the content of the dry solid to 4-12wt%. After the ashes are granulated, the granules are calcined. A rotary kiln or the like is used for granulation and granules having 0.5-15mm. grain sizes are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating sewage sludge incineration ash, in which the sewage sludge incineration ash is granulated and then fired to obtain
The purpose is to make dog aggregates.

Sewerage: f! Sewage sludge incineration ash generated per dog from IIJJ% i17. Currently, some of it is effectively used as compost, but most of it is disposed of in landfills on the coast or on land.

However, this treatment method also has location limitations, and landfill disposal is becoming increasingly difficult5. For this reason, sewage sludge 4:N
(There is a strong desire to develop a method for effectively using ash.

11 In order to meet this quadruple requirement, the present invention uses sewage 71i mud, j, and ash after granulation. ``It's light and sunny with 1, i, iji 1
1 (k:) We conducted 4111 studies in an attempt to create a dog-like benefit.

According to the results, sewage 7θθ:'+ 'I''l'i
It is possible to granulate by adding organic] l'rJm liquid to the waste ash (hole T). If the material is heated, and if the granulated material is fired, it will have a relatively low temperature and a small strong IW of Jt'il↑ at the temperature. □); Nodules/Bai! -IC
] I knew it would happen.

Next, I will explain the results of the experiment.
' Expressed as N-%, it is as shown in the 2131 table.
It is an alcoholic waste liquid that is used as a liquid, as shown in Table 2.

Table 2 Alcohol waste liquid was added to the incineration ash in various proportions and granulated, and the relationship between the moisture content and crushing strength of the granulated material and the amount of alcohol layer liquid added was determined, and the results shown in Figure 1 were compared. is. Here, the crushing strength is the strength measured using one of the methods for measuring the strength of granules. This is a method of saving money (testing the amount of force required to destroy the object).

In FIG. 1, ■ indicates the relationship between the crushing strength and the amount of alcohol waste liquid added, and 2 indicates the relationship between the water content and the amount of alcohol waste liquid added. Next, in FIG. 2, 1, 2, and 3 indicate the specific gravity of the fired product obtained, respectively. ,O,],,
2 and 1.4 are shown.

The above is a case where alcohol waste liquid is used as the organic waste liquid, but the same result can be obtained even if pulp waste liquid, for example cooking waste liquid from the SP method with the properties shown in Table 3, is used. 111/-6 From Figures 1 and 2, sewage f'i mud is also 1.1.
Organic waste liquid is added to the ash, and its dry solid content is /1 to 12.
i'1ij7j: Added to make 9K.
Then, a granulated material with a slightly lower water content and a higher crushing strength will be obtained.
;L to J' If this granulated material is fired, ・+rli
It is admonished that rJ, C's (bar knot 4')-like thing is f(j).

Next, t+j) made using the above method: 4 u of dead branches, 11% city
Mix portland cement with light aggregate and river sand, and test mortar. Table 4 shows the results of 1 test.

The unexploded city is based on these findings, and the dry solid matter is 4'+lt, 1.2-if-! Hi'kidney 3
1: This is a method for treating sewage sludge incineration ash, in which sea urchin is added, 2, the water content is adjusted, granulation is performed, and then the ash is calcined.

In the present invention, sludge from sewage is coagulated, precipitated, and dehydrated by adding slaked lime to the sludge. , granulation'proboscis high? ! M, melting i'4 during firing
1-, it becomes easier / oxidation of rice and sludge,
-+A1ri], ri 9(Jzo, the one below (jJ
i.

It's 9 inches long to go to the river.

lI+, of the manufactured fI'2 product, D'1' is the specific gravity of the fired product, +] Addition of waste liquid 4. '11, in the furnace): The surrounding air, J wind 1 + V time varies depending on the time, but approximately 10
It is between 00 and 12000C.

In some cases, the effect as a binder becomes weak, the strength of the granulated product is insufficient, and if the specific gravity of the fired product exceeds 12%, and if you try to obtain the desired specific gravity, , relatively high n,,! (I have to burn it at 95.
It has skin.

As the organic porcelain waste liquid, alcohol waste liquid produced as a by-product during the production of ethyl alcohol, and pulp waste liquid produced as a by-product when wood is digested by the SP method, etc. are used.

In the present invention, using a normal dish-shaped granulator or the like,
'l The mixture of incinerated ash and organic waste liquid is granulated and directly
A granulated material having a size of 15 brittleness is made.

It is recommended that the moisture content of the granulated product be adjusted to be 20 to 25π during granulation. Also this:＜'j
%R7'I needless to say (z can also be done using C1°, rotary kiln, etc., but in the present invention, since d:organic'?jl is used as a binder, heating is not necessary. Because it is composed of a composition that easily causes pulverization of the granulated material and easily fuses with sewage sludge incineration ash, it is particularly suitable for
By using the airflow firing method and furnace of No. 5-103166, the granules can be rapidly heated at the initial stage of charging.
The surface of the granules is immediately sintered, and there is little pulverization.
The granules do not fuse to each other, making it possible to produce a fired product with a light specific gravity.

According to the present invention, since the water content of the granulation proboscis is small and the granulated material has high strength, it is possible to not only reduce the amount of heat during drying and processing, but also to It is possible to prevent the pulverization and destruction of grains.It is possible to make fired products with low specific gravity and large strong IJ mu at a relatively low firing temperature.
The quality of the same or higher than Y amount aggregate is q:t,
c-, its industrial value is great.

Example: Sewage ill mud initially discharged from a sewage treatment plant i:t', ξ ash (its composition is the same as in Table 1) was passed through 200 meshes9
0% and its kalpa 7 ash crushing] 00 IT
1 (7) Add 20 parts of the alcohol waste shown in Table 2 and mix with 171 parts, and then add 20 parts of water.
Adjust the moisture content by adding a heavy part, and add the dish-shaped granulation (a granulation of 0.3 to 3.5% depending on the size and drying. Next, the granulation) to % #;!ri lln 55-7552
For air flow firing method using No. 2 vertical furnace: High temperature resistance 105
It was fired at 0°C.

(4% firing'1)
1, an artificial illumination bone mass with low specific gravity and high strength as shown in Table 4 was obtained. When the mortar strength was measured using the baked product of the rice bowl octopus, it showed the same strength as when using river sand as the aggregate.

In this example, even if the pulp waste liquid shown in Table 3 was used during granulation, the same results as above were obtained.

4.■ Song 'h' on side 1, explanation Figure 1 and Figure 21! XI shows the experimental terminology of the present invention, and Figure 1 shows the addition of alcohol waste liquid to the granulated product of sewage sludge shea', q]211 ash, the pressure oil strength of the granulated product, and the In the figure, 1 shows the relationship between the pressure α1 intensity and the amount of alcohol waste added, and 2 shows the relationship between the water content +11 and the amount of alcohol waste added. , 21 shows the relationship between the amount of ICL alcohol waste added and the firing temperature. 1 in Figure 2
゜2 and 3 are the specific gravity of the fired product, respectively, 1.0. ],,
2 and 1.4 are shown.

Claims (1)

[Claims] For sewage sludge incineration ash, organic waste liquid is dried 1.
1. A method for treating sewage sludge incineration ash, which comprises adding 4 to 12% of sewage sludge incineration ash, adjusting the moisture content by +1, granulating it, and then firing it.