JP4744796B2 - Aggregate solidified material for soil stabilization containing inorganic polymer flocculant and organic polymer flocculant - Google Patents

Description

The present invention focuses on the two major components silicon dioxide and aluminum oxide possessed by paper sludge ash, fly ash ash, and zeolite, and by combining hydrated compounds, inorganic polymer flocculants and organic polymer flocculants, Further, the present invention relates to a technique characterized by selection of a composition and setting of a composition amount capable of causing agglomeration instantly and in large quantities.

Conventionally, high moisture sludge generated at construction sites and disaster sites, and livestock sludge generated at pig farms, etc., recovered soil function using cement-based solidified material, lime-based solidified material, polymer-based solidified material, etc. Has been improved. For example, at the reclamation site, a strongly alkaline cement system is used as a soil solidifying material, and it takes a long time to solidify the soil. Further, lime-based fly ash ash is a soil-solidifying material in which hexavalent chromium, lead, etc. may be eluted from pigments contained in printed matter and the like, and generates heat at a high temperature when solidified. Furthermore, the polymer system shows weak acidity, and there is a limit to the use of any of the above-mentioned soil solidifying materials untreated.
Furthermore, the water content ratio at the time of soil solidification is low for any soil stabilizing solidifying agent such as a cement-based solidified material, a lime-based solidified material, and a polymer-based solidified material.

On the other hand, as for the utilization method of the soil conditioner, for example, Patent Document 1 proposes a granular solidified material for improving water content and soft soil. This is because “incineration ash such as fly ash ash and paper sludge ash generated as a large amount of waste is reused, and soft soil and sludge sludge with high water content are improved into a granular soil environment favorable for plant vegetation. In addition, a soil conditioner that has the effect of "suppressing the amount of cement harmful to plant biological systems as much as possible and increasing the soil strength more than ever has been provided."
However, the above means requires a long time to achieve the soil improvement, and there is a limit to the use in which the moisture content of the soil exceeds 185%. Therefore, even if it can be a temporary soil conditioner, it cannot be a permanent soil stabilizer that can instantly handle a wide range of soil moisture content.
Japanese Patent Application No. 2001-169024

Therefore, the present invention is mixed with soil such as soft soil and sludge sludge having a high water content, and the pH is neutrally modified and maintained, the degree of water retention can be adjusted according to the amount used, and the soil strength can be adjusted instantaneously. The present invention provides a soil-stabilized solidifying material that can be stably solidified over a wide range of 700% in terms of moisture ratio. Furthermore, the present invention provides a soil stabilizing and solidifying material that restores soil functions such as retaining the moisture of livestock sludge and deodorizing it.

  In order to achieve the above object, the soil stabilization aggregate solidified material containing the inorganic polymer flocculant and the organic polymer flocculant according to claim 1 is at least one of the group consisting of paper sludge ash, fly ash ash, and zeolite. 1 to 16 parts by weight of an inorganic polymer flocculant and 1 to 25 parts by weight of an organic polymer flocculant, 7 to 30 parts by weight of Portland cement, and 3 to 15 parts by weight of a sulfuric acid band with respect to 100 parts by weight of any one component. Parts, anhydrous gypsum 0.7 to 10 parts by weight, methacrylic acid ester 0.3 to 5 parts by weight, lignin sulfonates 0.08 to 0.53 parts by weight, stearates 0.07 to 0.40 parts by weight, It is characterized by mixing 0.04 to 0.27 parts by weight of sodium tripolyphosphate and 0.01 to 0.068 parts by weight of sodium hydroxide.

The soil-stabilized granular solidified material containing the inorganic polymer flocculant and the organic polymer flocculant according to claim 2 is composed of paper sludge ash, fly ash ash, silica skeleton in zeolite, inorganic polymer such as polyaluminum chloride, and the like. The aluminum of the flocculant is replaced with the same type and dehydrated to form a silica-alumina solid.

The aggregated solidified material for soil stabilization containing the inorganic polymer flocculant and the organic polymer flocculant according to claim 3 is a paper sludge ash, fly ash ash, and a nonionic organic polymer flocculant such as polyacrylamide. It is characterized by promoting the dehydration and separation of water by forming a flock.

The soil-stabilized granular solidified material containing the inorganic polymer flocculant and the organic polymer flocculant according to claim 4 is made of polyaluminum chloride in order to keep the water adsorbing ability of paper sludge ash, fly ash ash and zeolite high. And a polyacrylamide type flocculant to maximize the etrin guide crystal.

In the present invention, the granular solidified material for soil stabilization containing an inorganic polymer flocculant and an organic polymer flocculant contains silicon dioxide and aluminum oxide that are commonly present in paper sludge ash, fly ash ash and zeolite. Because it uses powdered incineration ash and natural resources as raw materials, it is a suitable group for plant vegetation by holding up to 700% of soil moisture such as soft soil and sludge sludge with high water content by combining with hydrated minerals Improving and solidifying instantly in a granular soil environment. Furthermore, since the water content of the livestock sludge is retained, the odor source dissolved in the water can be removed and vaporized for deodorization. Further, since the powdered incineration ash is ash obtained by incinerating a large amount of papermaking sludge, industrial waste can be effectively used.

The embodiment of the present invention will be described based on FIG. 1 and Table 1, Table 2, Table 3, Table 4, and Table 5. At the beginning, paper sludge ash, fly ash ash, and zeolite, which are raw materials of the present invention, will be described.
Paper sludge ash and fly ash ash are discharged as a large amount of industrial waste. Paper sludge ash is incineration disposal ash of papermaking sludge, and fly ash ash is combustion residue ash of coal. Zeolite is a natural resource and is used alone or as a mixed ash as a raw material for soil-stabilized solidification materials.

Next, the chemical composition of powdered incineration ash and natural resources will be described with an example.
Table 1 shows a comparison of chemical compositions of powdered incineration ash and natural resources, which are raw materials for soil-stabilized solidification materials. As shown in this table, the chemical composition that exists in large quantities in common in the raw material of the soil stabilizing solidification material of the present invention is silicon dioxide and aluminum oxide, and pay attention to the two major compositions and the three-dimensional network structure possessed by this raw material. Therefore, a soil-solidifying solidified solid material containing an inorganic polymer flocculant and an organic polymer flocculant has been devised.

Next, the composition of the soil-stabilized solid material using the paper sludge ash, fly ash ash, and zeolite as the raw materials having the above properties was examined. The two major chemical compositions present in large amounts in powdered incineration ash and natural resources are silicon dioxide and aluminum oxide. Considering the composition and the three-dimensional network structure possessed by this raw material, attention was paid to the function of increasing the amount of water absorption.
In other words, hydrated minerals are added to a system consisting of paper sludge ash, fly ash ash, zeolite and water to form a paper sludge ash, fly ash ash, zeolite hydrated mineral-water system. The system is presumed to form a rapid hydration reaction and increase the amount of water adsorbed. Further, an aluminum-based inorganic polymer flocculant is added to the hydrate, and after the same type substitution of aluminum is performed on the powdered incineration ash and the silica skeleton of natural resources, dehydration, oxide ions and metal ions Is exposed on the surface to become a silica-alumina solid surface to improve the reactivity, so-called catalytic action appears. Therefore, the silica-alumina solid surface promotes hydration reaction with the hydrated mineral to increase the amount of water absorption, and by adding an organic polymer flocculant, the soil particles are aggregated to further promote soil solidification. In other words, a material containing an inorganic polymer flocculant and an organic polymer flocculant was considered as a material capable of imparting a water absorbing function to a hydrated mineral.

Accordingly, a soil-stabilized solidifying material was prepared by using the paper sludge ash, fly ash ash, and zeolite as raw materials, and adding a new additive to the hydrated mineral to greatly increase the amount of water adsorbed. Table 2 shows the composition of the soil-stabilizing material. Hydrated minerals and flocculants cause hydration to form hydrates at the interface between paper sludge ash, fly ash ash, zeolite and water, and promote water absorption from soft soil such as sludge. Effective use of powdered incineration ash and natural resources and functional recovery to stable solidification of sludge.

Furthermore, the function of each composition is demonstrated.
Paper sludge ash, fly ash ash, and zeolite, which retain the porosity, absorb moisture in the sludge and react with hydrated minerals that make up the soil-stabilized solidified material to cause a hydration reaction. The first hydrated mineral, Portland cement or early strength cement, has the property of absorbing water and solidifying with the contained aggregate. The second hydrated mineral, the sulfate band, lowers the pH and adsorbs and fixes dissolved pollutants that elute into sludge moisture. The third is anhydrous gypsum, which has the effect of solidifying water by hydration to increase the strength of the soil and helping the cohesive strength of the sulfate band. The fourth is methacrylic acid ester, and the combination of sulfuric acid band and anhydrous gypsum greatly enhances the cohesive strength. It also has the effect of preventing cracks in the improved soil. The fifth is lignin sulfonates, and when they come into contact with cement particles, they have the effect of uniformly dispersing the cement particles of the cement aggregate group by their wetting, permeating and adsorbing actions. The sixth is stearates. These nonionic stearates are anionic lignin sulphonates alone, making hydrophobic materials more hydrophilic by strongly hydrophobizing and dispersing uniformly, and gelling with other admixtures to increase the viscosity. There is an effect to tie. The seventh sodium tripolyphosphate adsorbs a large amount of cations through a negatively charged phosphate group, so that the effect of uniformly dispersing is increased. The eighth hydrated mineral, sodium hydroxide, is strongly alkaline and serves to neutralize acidic soil.

As a result, paper sludge ash, fly ash ash, and zeolite that retain porosity absorb water in the sludge and cause a hydration reaction by the hydrated minerals that make up the soil-stabilized solidified material.・ Al ₂ O ₃・ 3CaSO ₄・ 32H ₂ O is produced. The ETLIN GUIDE quickly solidifies and aggregates while surrounding the paper sludge ash, fly ash ash, zeolite and soil particles as it forms as needle-like crystals while reducing the water content of the sludge. Moreover, since the paper sludge ash, fly ash ash, and zeolite are porous, they do not adsorb and absorb organic matter, heavy metals, odors, etc. on the pore surface in a short time, and are strong aggregates together with the ettrine guide. Form.

However, there is a limit to the growth of needle-shaped crystal ethrin guides that are produced while reducing the water content of sludge. This is because the growth of the etrin guide gradually slows down as the soil particles become solidified aggregates, resulting in an upper limit on the soil strength.
Therefore, an aluminum-based inorganic polymer flocculant polyaluminum chloride is added to the hydrated mineral to cause dehydration by causing the same substitution of aluminum into the powdered incineration ash and the silica skeleton of natural resources, and the oxide ions and metal Ions are exposed on the surface, improving the reactivity of the silica-alumina solid surface and causing so-called catalysis. Therefore, as shown in FIG. 1, the powdered incineration ash such as paper sludge ash 2 and natural resources become a silica-alumina solid to promote the hydration reaction with the hydrated mineral on the surface, and the acicular crystal ettrine guide While further developing 1, the water absorption amount is increased, and the solidification of the soil particles 3 is promoted.
Further, by adding a polyacrylamide nonionic flocculant which is an organic polymer flocculant, flocs 4 are formed to promote the dehydration and separation of water by agglomerating the soil particles. Already formed aggregates hinder the growth of the needle-like crystal ethrin guide 1, but the soil strength is increased because the flocs 4 are formed and the soil particles 3 are aggregated as stronger aggregates. As a result, the growth of the ettlin guide 1 is facilitated, and as a result, the soil solidification can be surprisingly promoted even with sludge having a moisture ratio of 700%.
The material containing the inorganic polymer flocculant and the organic polymer flocculant forms a material that further imparts a water absorption function to the hydrated mineral.

As described above, in consideration of the properties of each raw material in the soil-stabilized solidifying material, blending is performed within the range of the above mixed weight ratio so as to suit the properties and conditions of the soil to be improved. Table 3 shows examples of the soil-stabilized solidifying material that is the basis of the above.

Next, Table 4 shows a mixing example in which 1 ton of the soil stabilizing solidifying material shown in Table 3 is mixed with sludge raw sludge to improve for agricultural land, sidewalks, and roadways. As can be seen in this mixed example, the amount of the soil stabilizing solidifying material added varies depending on the moisture content of the raw soil and the target modified soil. For example, the road strength for sidewalks, which is difficult for bicycle heels, is about 0.2 kgf / cm ² in terms of uniaxial compression strength. Adjust the amount of paper sludge ash soil stabilization solidifier so that this value can be obtained, and add 5% of the total weight including water to soft soil or sludge sludge with a high water content to make the composition when forming roads. In addition, 3% is added to make the composition at the time of farmland formation. Furthermore, since the road for general roads shows 3 kgf / cm ² in terms of uniaxial compressive strength compared to the road for sidewalks, 7% of the total weight of sludge sludge was added to make the composition at the time of road formation. On highway roads, it was confirmed that it could be up to 20% of the total weight considering the uniaxial compressive strength.

  Next, Table 5 shows a comparative example of addition treatment to sludge sludge having a high moisture content. Corresponding to the moisture content of sludge-like sludge, the usable range of the soil-stabilized solidification material can be determined by the performance and amount of the soil-stabilized solidification material. In the conventional soil-stabilized solidified material, the water content ratio of sludge-like sludge was 185%, but the soil-stabilized material of the present invention has not been obtained so far, that is, sludge-like sludge having a water content ratio of 700%. This means that it has become possible. However, an addition treatment to sludge having a water content ratio of 400% is a general addition amount, and the addition amount increases and the price increases more than that (see FIGS. 2 and 3).

The present invention relates to agricultural soil created by retaining soft soil or sludge sludge with a high water content, roads with higher strength, and deodorization by retaining moisture from livestock sludge. It can be used as a soil stabilizing and solidifying material required for functional recovery. Furthermore, it can utilize for the soil stabilization solidification material regarding the quantity required for the function recovery.

The schematic diagram of the acicular crystal | crystallization ettlin guide which shows one Example of this invention, paper sludge ash, a soil particle, and a flock. It is the photograph which compared the case where the general solidification agent and the aggregate solidification material for soil stabilization of the present invention are added to the sludge water. In the photograph which shows the state after addition same as the above, the left shows the general solidifying agent when the water content is 400%, and the right shows the solidifying agent of the present invention when the water content is 400%.

Explanation of symbols

1 Needle Crystal Etrin Guide 2 Paper Sludge Ash 3 Soil Particles 4 Flock

Claims (4)

0.5 to 5 parts by weight of an aluminum-based inorganic polymer flocculant and polyacrylamide-based organic polymer agglomeration with respect to 100 parts by weight of a component containing at least one of the group consisting of paper sludge ash, fly ash ash, and zeolite agent 0.5-7 parts by weight, Portland cement 7 to 30 parts by weight, the band 3-15 parts by weight of sulfuric acid, 0.7 to 10 parts by weight of anhydrous gypsum, 0.3 to 5 parts by weight of methacrylic acid esters, lignin sulfonic acid salts 0.08 to 0.53 parts by weight, stearates 0.07 to 0.40 parts by weight, sodium tripolyphosphate 0.04 to 0.27 parts by weight, sodium hydroxide 0.01 to 0.068 parts by weight An aggregated solidified material for soil stabilization containing an inorganic polymer flocculant and an organic polymer flocculant. 2. The inorganic polymer agglomeration according to claim 1, wherein the silica skeleton of paper sludge ash, fly ash ash, or zeolite is dehydrated by substitution of aluminum with polyaluminum chloride to form a silica-alumina solid. A soil-solidifying solidified solid material containing an agent and an organic polymer flocculant. The inorganic polymer flocculant and the organic material according to claim 1, wherein the paper sludge ash, fly ash ash, or zeolite forms a floc with the polyacrylamide organic polymer flocculant to promote water dehydration separation. Aggregate solidified material for soil stabilization containing a polymer flocculant. The etrin guide crystal is grown by adding polyaluminum chloride and a polyacrylamide-based flocculant in order to maintain a high water adsorption capacity of paper sludge ash, fly ash ash, or zeolite. A granular solidified material for soil stabilization containing the inorganic polymer flocculant described above and an organic polymer flocculant.