JP2009045624A - Solidifying and insolubilizing agent for contaminated soil - Google Patents
Solidifying and insolubilizing agent for contaminated soil Download PDFInfo
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本発明は、汚染物質によって汚染された土壌の固化不溶化剤に関するものである。 The present invention relates to a solidifying and insolubilizing agent for soil contaminated with pollutants.
重金属類は人体に有害な物質であるが、特に火山国である我が国の土壌には、元来各種鉱物に起因する重金属類が含まれており、また近年、工業の発展に併ない工場等から排出される汚染物質による土壌汚染も顕著になってきている。 Heavy metals are harmful to the human body, but our soil, especially a volcanic country, originally contains heavy metals derived from various minerals. Soil contamination by discharged pollutants is also becoming more prominent.
［従来の技術］
従来は、重金属類汚染土壌を搬出して新しい非汚染土壌と交換する方法、重金属類汚染土壌を高温処理して溶融し重金属類を封鎖する方法、重金属類汚染土壌をセメントおよびセメント系固化剤で固化不溶化して重金属類を封じ込める方法等が採られている（例えば特許文献１参照）。
[Conventional technology]
Conventionally, a method of removing heavy metal contaminated soil and replacing it with new non-contaminated soil, a method of treating heavy metal contaminated soil with high temperature and melting it to sequester heavy metals, and heavy metal contaminated soil with cement and cement-based solidifying agent A method of solidifying and insolubilizing and containing heavy metals has been adopted (see, for example, Patent Document 1).
上記土壌交換方法では搬出した汚染土壌の処分場所あるいは無害化が問題となり、また汚染土壌の高温処理方法ではエネルギーコストや設備費が莫大になり、またセメントまたはセメント系固化剤による汚染土壌の固化方法では、固化土が高アルカリ性になり、該固化土からアルカリが溶出して動植物に悪影響をもたらし、またアルカリによって汚染物質が再溶出するおそれがある。 In the above soil exchange method, the disposal location or detoxification of the contaminated soil carried out becomes a problem, and in the high temperature treatment method of the contaminated soil, energy costs and equipment costs become enormous, and the method of solidifying the contaminated soil with cement or a cement-based solidifying agent Then, the solidified soil becomes highly alkaline, and the alkali is eluted from the solidified soil to adversely affect animals and plants, and the pollutants may be re-eluted by the alkali.
本発明は上記従来の課題を解決するための手段として、ＭｇＯおよび／またはＭｇＯ含有材と、塩化第二鉄を含有する固化不溶化助剤と、を含み、有害物質汚染土壌に添加されて該土壌を固化させると共に該土壌に含有されている有害物質を不溶化させる、有害物質汚染土壌用固化不溶化剤を提供するものである。ＭｇＯ１００質量部に対して固化不溶化助剤を１０〜３００質量部添加することが好ましく、また上記土壌用固化不溶化剤１００質量部に更に有機高分子凝集剤を０．１〜５．０質量部添加することが好ましい。
固化不溶化助剤は、ポリ塩化アルミニウム（ＰＡＣ）を含有することが好ましい。
固化不溶化助剤は、カルシウム塩、マグネシウム塩、高炉スラグ、二酸化ケイ素、およびパーライトからなる群より選ばれる少なくとも一つを含有することが好ましい。
固化不溶化助剤は、活性炭、ゼオライト、およびケイ藻土からなる群より選ばれる少なくとも一つを含有することが好ましい。
有害物質としては、マンガン、クロム、銅、鉛、カドミウム、水銀、およびセレンからなる群より選ばれる少なくとも一つの重金属を含有することが好ましく、窒素、リン、ホウ素、ヒ素、シアン、および含塩素有機化合物からなる群より選ばれる少なくとも一つを含有することが好ましい。
The present invention includes a MgO and / or MgO-containing material and a solidified and insolubilized auxiliary agent containing ferric chloride as a means for solving the above-described conventional problems, and is added to the harmful substance-contaminated soil and the soil And a solidifying and insolubilizing agent for toxic substance-contaminated soil, which makes the toxic substance contained in the soil insoluble. It is preferable to add 10 to 300 parts by mass of a solidification and insolubilization aid to 100 parts by mass of MgO, and 0.1 to 5.0 parts by mass of an organic polymer flocculant is further added to 100 parts by mass of the solidification and insolubilization agent for soil. It is preferable to do.
The solidification / insolubilization aid preferably contains polyaluminum chloride (PAC).
The solidification / insolubilization aid preferably contains at least one selected from the group consisting of calcium salt, magnesium salt, blast furnace slag, silicon dioxide, and pearlite.
The solidification insolubilization aid preferably contains at least one selected from the group consisting of activated carbon, zeolite, and diatomaceous earth.
The harmful substance preferably contains at least one heavy metal selected from the group consisting of manganese, chromium, copper, lead, cadmium, mercury, and selenium. Nitrogen, phosphorus, boron, arsenic, cyan, and chlorine-containing organics It is preferable to contain at least one selected from the group consisting of compounds.
本発明においては、重金属類等の有害物質によって汚染された土壌を植物成長に差支えないｐＨ範囲でＭｇＯによって固化不溶化し、有害物質を再溶出することなく固化土内に封鎖することが出来る。 In the present invention, soil contaminated with toxic substances such as heavy metals can be solidified and insolubilized with MgO in a pH range that does not interfere with plant growth, and sealed in the solidified soil without re-elution of toxic substances.
［作用］
ＭｇＯは低アルカリ性でありかつ汚染物質の溶出に対する不溶化力に優れている。ＭｇＯに固化不溶化助剤を添加すると、固化土は更に低アルカリ性になったり固化速度が早くなったり、あるいは固化物の強度が向上したりする。また有機高分子凝集剤の添加により固化土の強度が向上する。本発明を以下に詳細に説明する。
[Action]
MgO has a low alkalinity and an excellent insolubilizing power against the elution of contaminants. When a solidification / insolubilization aid is added to MgO, the solidification soil becomes more alkaline, the solidification speed is increased, or the strength of the solidified product is improved. Moreover, the strength of the solidified soil is improved by the addition of the organic polymer flocculant. The present invention is described in detail below.
〔ＭｇＯ〕
本発明に使用されるＭｇＯには、低温焼成品と高温焼成品とがあるが、反応性の点からみて低温焼成品（軽焼ドロマイト）の使用が望ましい。また本発明では軽焼ドロマイトやドロマイトプラスターのようなＭｇＯを含むものも使用出来る。軽焼ドロマイトはドロマイト（炭酸カルシウムと炭酸マグネシウムの複塩で理論値として炭酸カルシウム５４．２７％、炭酸マグネシウム４５．７３％の割合で含有）を７００〜１０００℃で焼成し炭酸マグネシウムをＭｇＯとし、一部の炭酸カルシウムを酸化カルシウムとしたものである。ドロマイトプラスターは軽焼ドロマイトを水と反応消化させた水酸化ドロマイトを微粉砕し整粒したものであり、粉末化に問題のある軽焼ドロマイトよりも望ましいＭｇＯ含有材である。上記ＭｇＯおよび／またはＭｇＯ含有材は、処理対象土壌に対しＭｇＯとして１〜３０（質量／容量）％添加することが好ましい。
[MgO]
MgO used in the present invention includes a low-temperature fired product and a high-temperature fired product. From the viewpoint of reactivity, it is desirable to use a low-temperature fired product (light-fired dolomite). In the present invention, those containing MgO such as lightly burned dolomite and dolomite plaster can also be used. Lightly burned dolomite is calcined at 700-1000 ° C. with dolomite (a double salt of calcium carbonate and magnesium carbonate and containing 54.27% calcium carbonate and 45.73% magnesium carbonate as a theoretical value), and magnesium carbonate is MgO. A part of calcium carbonate is calcium oxide. Dolomite plaster is obtained by finely pulverizing and sizing hydrated dolomite obtained by reactively digesting light-burned dolomite with water, and is a desirable MgO-containing material than light-burning dolomite, which has a problem in powderization. The MgO and / or MgO-containing material is preferably added in an amount of 1 to 30 (mass / volume) as MgO with respect to the soil to be treated.
〔固化不溶化助剤〕
ＭｇＯおよび／またはＭｇＯ含有材を土壌と混合して水中に投入した場合、固化発現に長時間を要したり、強度が空気中より低下することがある。そこで水中でも空気中と同様の固化を可能するために固化不溶化助剤を添加することが好ましい。また１５０％以上の高含水比で泥水状態の汚染土壌の場合にはフィルタープレス等を使用して機械脱水を行なうことが望ましいが、この場合機械脱水を容易ならしめるために固化不溶化助剤を添加することが好ましい。
[Solidification and insolubilization aid]
When MgO and / or a MgO-containing material is mixed with soil and thrown into water, solidification may take a long time or strength may be lower than in air. Therefore, it is preferable to add a solidification / insolubilization aid in order to enable the same solidification in water as in air. In the case of muddy soil with a high water content of 150% or more, it is desirable to perform mechanical dehydration using a filter press or the like. In this case, a solidification and insolubilization aid is added to facilitate mechanical dehydration. It is preferable to do.
上記固化不溶化助剤（以下第１助剤とする）としては、例えば硫酸アルミニウム、ポリ塩化アルミニウム（ＰＡＣ）等の酸性アルミニウム塩、硫酸第一鉄、塩化第二鉄等の酸性鉄塩、リン酸あるいは第一リン酸ソーダ、重過リン酸カルシウム、過リン酸カルシウム等の酸性リン酸塩類等があり、上記第１助剤は二種以上混合使用されてもよい。 Examples of the solidification and insolubilization aid (hereinafter referred to as the first aid) include acidic aluminum salts such as aluminum sulfate and polyaluminum chloride (PAC), acidic iron salts such as ferrous sulfate and ferric chloride, and phosphoric acid. Or there exist acidic phosphates, such as a primary sodium phosphate, a heavy percalcium phosphate, a calcium perphosphate, etc., and the said 1st adjuvant may be used in mixture of 2 or more types.
ＭｇＯおよび／またはＭｇＯ含有材のみ、あるいはＭｇＯおよび／またはＭｇＯ含有材と上記固化不溶化助剤のみでは、土壌の種類によって不溶化のために必要な固化強度が効率良く得られなかったり、あるいは固化強度発現までに長時間を要する場合がある。この場合には更なる固化不溶化助剤として固化を促進させるような薬剤（以下第２助剤とする）を使用することが好ましい。 With only MgO and / or MgO-containing material, or only MgO and / or MgO-containing material and the above-mentioned solidification insolubilization aid, the solidification strength required for insolubilization may not be obtained efficiently depending on the type of soil, or solidification strength will be manifested. It may take a long time to complete. In this case, it is preferable to use an agent that promotes solidification (hereinafter referred to as a second auxiliary agent) as a further solidification / insolubilization aid.
上記第２助剤としては、例えば炭酸カルシウム、硫酸カルシウム、塩化カルシウム等のカルシウム塩、炭酸マグネシウム、硫酸マグネシウム、塩化マグネシウム等のマグネシウム塩や高炉スラグ、二酸化ケイ素、パーライト等があり、上記第２助剤は二種以上混合使用されてもよい。上記硫酸カルシウムとしては無水または半水石膏が例示され、特に半水石膏の使用が望ましく、上記二酸化ケイ素としては含水非結晶型二酸化ケイ素、無水二酸化ケイ素、シリカヒューム等がある。高炉スラグはＭｇＯに比べて高アルカリであるが、価格がＭｇＯに比べて安価であり、長期安定性にも寄与するので、ＭｇＯ１００質量部に対して１０〜３００質量部程度添加することが好ましい。しかし３００質量部を越える添加量では十分な固化強度が得られない場合がある。 Examples of the second auxiliary agent include calcium salts such as calcium carbonate, calcium sulfate, and calcium chloride, magnesium salts such as magnesium carbonate, magnesium sulfate, and magnesium chloride, blast furnace slag, silicon dioxide, pearlite, and the like. Two or more agents may be used in combination. Examples of the calcium sulfate include anhydrous or hemihydrate gypsum, and it is particularly desirable to use hemihydrate gypsum. Examples of the silicon dioxide include hydrous amorphous silicon dioxide, anhydrous silicon dioxide, and silica fume. Blast furnace slag is highly alkaline compared to MgO, but is cheaper than MgO and contributes to long-term stability. Therefore, it is preferable to add about 10 to 300 parts by mass with respect to 100 parts by mass of MgO. However, if the addition amount exceeds 300 parts by mass, sufficient solidification strength may not be obtained.
更に固化不溶化助剤としては、有害物質を吸着するような薬剤例えば活性炭、ゼオライト、ケイ藻土等を使用してもよい（以下第３助剤と云う）。このうちゼオライトは特に重金属類に対する吸着効果に優れており、一般にＭｇＯ１００質量部に対して１０〜３００質量部好ましくは１０〜１００質量部添加することが好ましい。 Further, as the solidification / insolubilization aid, an agent capable of adsorbing harmful substances such as activated carbon, zeolite, diatomaceous earth, etc. may be used (hereinafter referred to as third aid). Among these, zeolite is particularly excellent in the adsorption effect on heavy metals, and generally 10 to 300 parts by mass, preferably 10 to 100 parts by mass, are preferably added to 100 parts by mass of MgO.
上記第１、第２、第３助剤の種類の選択および添加量は対象土壌の性状、例えば有害物質の種類、土質、含水比、粒度等によって適当に設定されるべきである。例えば前記機械的脱水を行なう場合には固化不溶化助剤として第１助剤であるポリ塩化アルミニウムおよび／または塩化第二鉄を選択すること好ましく、この場合には上記固化不溶化助剤はＭｇＯ１００質量部に対して１０〜３００質量部好ましくは５０〜１５０質量部の範囲の添加量である。 The selection and addition amount of the first, second and third auxiliary agents should be appropriately set according to the properties of the target soil, for example, the types of harmful substances, soil quality, water content, particle size and the like. For example, when performing the mechanical dehydration, it is preferable to select polyaluminum chloride and / or ferric chloride as the first auxiliary agent as the solidification insolubilization aid. In this case, the solidification insolubilization aid is 100 parts by mass of MgO. The addition amount is in the range of 10 to 300 parts by weight, preferably 50 to 150 parts by weight.
また六価クロムを有害物質として含む土壌の場合には固化不溶化助剤として第１助剤である硫酸第一鉄が良く、添加量はＭｇＯ１００質量部に対して１０〜３００質量部、好ましくは１０〜１００質量部とされる。硫酸第一鉄の添加量が３００質量部を上回ると、ＭｇＯの土壌に対する固化能力が著しく低下する。 Further, in the case of soil containing hexavalent chromium as a harmful substance, ferrous sulfate as a first auxiliary agent is good as a solidifying and insolubilizing auxiliary agent, and the addition amount is 10 to 300 parts by mass, preferably 10 parts per 100 parts by mass of MgO. -100 mass parts. When the addition amount of ferrous sulfate exceeds 300 parts by mass, the solidification ability of MgO to the soil is significantly reduced.
更に５０％以下の低含水比の汚染土壌から５０〜１５０％の中含水比の汚染土壌に対しては、第１助剤である硫酸アルミニウムが有効であり、特に前記固化を促進させるような固化不溶化助剤である第２助剤と併用するとより効果的である。 Furthermore, aluminum sulfate, which is the first auxiliary agent, is effective for contaminated soil having a low water content ratio of 50% or less to soil having a medium water content ratio of 50 to 150%, and is particularly solidified to promote the solidification. It is more effective when used in combination with a second auxiliary agent which is an insolubilizing auxiliary agent.
更に前記固化を促進させる固化不溶化助剤である第２助剤は、ＭｇＯ１００質量部に対して１０〜３００質量部、好ましくは１０〜１００質量部添加する。これに満たない添加量では該第２助剤の固化促進効果が充分発揮されず、これを越える添加量ではコスト高になり、場合によってはＭｇＯの固化不溶化効果を損なうおそれがある。 Furthermore, the 2nd adjuvant which is a solidification insolubilization adjuvant which accelerates | stimulates the said solidification adds 10-300 mass parts with respect to 100 mass parts of MgO, Preferably it is 10-100 mass parts. If the addition amount is less than this, the solidification promoting effect of the second auxiliary agent is not sufficiently exhibited. If the addition amount exceeds this amount, the cost becomes high, and in some cases, the solidification insolubilization effect of MgO may be impaired.
上記固化促進のために添加する第２助剤の場合、含水比が５０〜１５０％前後の汚染土壌に対して硫酸カルシウム、二酸化ケイ素、パーライトが有用であり、これらを添加することによって、固化強度が増大し、ＭｇＯの不溶化効果が助長される。またこれら第２助剤は、前記第１助剤である硫酸アルミニウムと併用した場合に相乗効果が得られることも少なくない。この場合第２助剤と硫酸アルミニウムとの混合比は、対象土壌の性状にもよるが、一般的には第１助剤としての硫酸アルミニウム１００質量部に対して上記第２助剤を１００〜２００質量部混合する。 In the case of the second auxiliary agent added for promoting the solidification, calcium sulfate, silicon dioxide, and pearlite are useful for contaminated soil having a water content ratio of about 50 to 150%. Increases and the insolubilizing effect of MgO is promoted. Moreover, when these 2nd adjuvants use together with the aluminum sulfate which is the said 1st adjuvant, a synergistic effect is often acquired. In this case, the mixing ratio of the second auxiliary agent and aluminum sulfate depends on the properties of the target soil, but generally the second auxiliary agent is 100 to 100 parts by mass with respect to 100 parts by mass of the aluminum sulfate as the first auxiliary agent. Mix 200 parts by weight.
〔有害物質〕
本発明において、汚染土壌に含まれる有害物質には、例えばマンガン、クロム、銅、鉛、カドミウム、水銀、セレン等の重金属、窒素、リン、ホウ素、ヒ素、シアン、含塩素有機化合物等がある。該含塩素有機化合物としては、テトラクロロジベンゾパラシオキシン（ダイオキシン）、テトラクロルメタン、トリクロロエチレン、塩素化ジフェニル、塩素化パラフィン等が例示される。
〔Hazardous substance〕
In the present invention, harmful substances contained in the contaminated soil include, for example, heavy metals such as manganese, chromium, copper, lead, cadmium, mercury, selenium, nitrogen, phosphorus, boron, arsenic, cyan, and chlorine-containing organic compounds. Examples of the chlorine-containing organic compound include tetrachlorodibenzoparacioxine (dioxin), tetrachloromethane, trichloroethylene, chlorinated diphenyl, and chlorinated paraffin.
〔土壌処理〕
上記第１、第２、第３助剤は単独で使用しても、あるいは第１助剤と第２助剤、第１助剤と第３助剤、第２助剤と第３助剤を組合わせて使用しても、あるいは３つすべてを組合わせて使用してもよい。いづれを選ぶかは、前記したように対象土壌の性状、有害物質の種類、土質、含水比、粒度等を考慮する。一般的に云って上記助剤はＭｇＯ１００質量部に対して１０〜３００質量部の範囲で添加される。このようにして配合された本発明の固化不溶化助剤は対象土壌が高含水であり、フィルタープレス等の機械的脱水固化を行う場合は汚染土壌１ｍ3当たりＭｇＯとして１０〜２００kg添加される。また一般土壌の場合は対象土壌１ｍ3当たりＭｇＯとして３０〜３００kg添加される。
[Soil treatment]
The first, second and third auxiliaries may be used alone, or the first auxiliaries and the second auxiliaries, the first auxiliaries and the third auxiliaries, the second auxiliaries and the third auxiliaries. They may be used in combination, or all three may be used in combination. As described above, the selection is made in consideration of the properties of the target soil, the types of harmful substances, the soil quality, the moisture content, the particle size, and the like. Generally speaking, the auxiliary agent is added in the range of 10 to 300 parts by mass with respect to 100 parts by mass of MgO. The solidified and insolubilized auxiliary agent of the present invention formulated in this way has high water content in the target soil, and when performing mechanical dehydration solidification such as a filter press, 10 to 200 kg of MgO is added per 1 m 3 of contaminated soil. In the case of general soil, 30 to 300 kg of MgO is added per 1 m 3 of the target soil.
〔有機高分子凝集剤〕
処理対象土壌の含水比が例えば１００％以上の場合には、土壌中のフリー水分を吸収して処理対象土壌の固化強度の向上や土壌用固化不溶化剤の添加量を減らすために、有機高分子凝集剤が使用される。上記有機高分子凝集剤としては、例えばポリアクリル酸ソーダ、ポリアクリルアミド、アクリル酸ソーダ−アクリルアミド共重合体、ポリエチレンオキサイド等がある。
(Organic polymer flocculant)
When the water content of the soil to be treated is, for example, 100% or more, an organic polymer is used to absorb the free water in the soil and improve the solidification strength of the soil to be treated or to reduce the amount of solidified insolubilizer for soil. A flocculant is used. Examples of the organic polymer flocculant include polyacrylic acid soda, polyacrylamide, sodium acrylate-acrylamide copolymer, and polyethylene oxide.
〔参考例１・比較例１〕
現場から採取した砂質土（含水比＝１５．３％、礫・砂分＝８２％、シルト・粘土分＝１８％、密度＝１．８１g/cm3）の重金属類溶出試験を下記の通り行った。上記重金属類汚染砂質土１ｍ3に下記組成の固化剤Ａを１５（質量／容量）％添加攪拌混合して固化せしめた。上記固化処理から２８日経過後の固化体の環境庁告示第４６号による溶出試験結果を表１に示す。
固化剤Ａの組成 参考例 比較例
軽焼酸化マグネシウム １００質量部
高炉セメントＢ種 １００質量部
[Reference Example 1 / Comparative Example 1]
The heavy metal elution test of sandy soil (water content = 15.3%, gravel and sand = 82%, silt and clay = 18%, density = 1.81 g / cm 3 ) collected from the site is as follows. went. To 1 m 3 of the above heavy metal contaminated sandy soil, 15 (mass / volume)% of a solidifying agent A having the following composition was added and mixed to be solidified. Table 1 shows the results of the dissolution test according to Environmental Agency Notification No. 46 of the solidified material after 28 days from the above solidification treatment.
Composition of solidifying agent A Reference example Comparative example Light burned magnesium oxide 100 parts by mass Blast furnace cement type B 100 parts by mass
従来技術であるセメントでは、重金属類複合汚染土に含まれるすべての重金属類を土壌環境基準以下に固化・不溶化することは困難である。上記固化体の２８日後の一軸圧縮強度は１，５２０KN/m2、ｐＨは１０．１であった。 With the conventional cement, it is difficult to solidify and insolubilize all heavy metals contained in heavy metal complex contaminated soil below the soil environmental standards. The uniaxial compressive strength after 28 days of the solidified product was 1,520 KN / m 2 , and the pH was 10.1.
〔参考例２・比較例２〕
現場から採取した砂質土（含水比＝２１．５％、礫・砂分＝７３％、シルト・粘土分＝２７％、密度＝１．７６g/cm3）の重金属類溶出試験を下記の通り行った。上記重金属類汚染砂質土１ｍ3に下記組成の固化剤Ｂを１５（質量／容量）％添加攪拌混合して固化せしめた。上記固化処理から２８日後の固化体の環境庁告示第４６号による溶出試験結果を表２に示す。
固化剤Ｂの組成 参考例 比較例
軽焼酸化マグネシウム １００質量部 −
硫酸第一鉄 ５０質量部 −
過リン酸石灰 ５０質量部 −
高炉セメントＢ種 １００質量部
[Reference Example 2 / Comparative Example 2]
The heavy metal elution test of sandy soil (water content = 21.5%, gravel and sand = 73%, silt and clay = 27%, density = 1.76 g / cm 3 ) collected from the site is as follows. went. 15 ml (mass / volume) of solidifying agent B having the following composition was added to 1 m 3 of the above heavy metal-contaminated sandy soil, and the mixture was stirred and solidified. Table 2 shows the results of the dissolution test by the Environmental Agency Notification No. 46 of the solidified product 28 days after the above solidification treatment.
Composition of solidifying agent B Reference example Comparative example Lightly burned magnesium oxide 100 parts by mass −
Ferrous sulfate 50 parts by mass −
50 parts by mass of superphosphate lime −
Blast furnace cement type B 100 parts by mass
表２の結果から、従来技術であるセメント系固化剤としての高炉セメントＢ種を添加した比較例では、鉛および六価クロムの溶出濃度が土壌環境基準を上回ったが、ＭｇＯを含有する固化剤Ｂを用いた参考例では、土壌環境基準以下に不溶化出来た。上記参考例の固化体の２８日後の一軸圧縮強度は２，０５０KN/m2、ｐＨは９．８であった。 From the results of Table 2, in the comparative example in which B type blast furnace cement B as a cement-based solidifying agent, which is a conventional technology, was added, the elution concentration of lead and hexavalent chromium exceeded the soil environment standard, but the solidifying agent containing MgO In the reference example using B, it was insolubilized below the soil environmental standard. The solidified product of the above Reference Example had a uniaxial compressive strength after 28 days of 2,050 KN / m 2 and a pH of 9.8.
〔実施例１・比較例３〕
シアンを含むスラッジ（含水比＝３９８％、比重＝１．１２９）の性状は、表３に示す通りであった。この試料１ｍ3に下記組成の固化剤Ｃを４（質量／容量）％添加し、フィルタープレス脱水・固化し、７日後に実施した環境庁告示第４６号による溶出試験結果を表３に示す。
固化剤Ｃの組成 実施例 比較例
軽焼酸化マグネシウム １００質量部
ＰＡＣ ５０質量部
塩化第二鉄 ５０質量部
高炉セメントＢ種 １００質量部
[Example 1 and Comparative Example 3]
Table 3 shows the properties of the sludge containing cyan (water content ratio = 398%, specific gravity = 1.129). Table 3 shows the results of dissolution tests according to Environmental Agency Notification No. 46, which was carried out 7 days after adding 4 (mass / volume)% of solidifying agent C having the following composition to 1 m 3 of this sample, dehydrating and solidifying the filter press.
Composition of solidifying agent C Examples Comparative examples Light-burned magnesium oxide 100 parts by mass PAC 50 parts by mass Ferric chloride 50 parts by mass Blast furnace cement type B 100 parts by mass
ＭｇＯを含有する固化剤Ｃを用いることによって、脱水ケーキのシアン溶出濃度を土壌環境基準以下に出来るが（表３）、従来技術であるセメント系固化剤としての高炉セメントＢ種を使用した場合には、脱水ケーキのシアン溶出濃度を土壌環境基準以下に出来ず、更に濾水にセメント中に含まれていたと思われる六価クロムが土壌環境基準を越えて溶出した（表４）。 By using the solidifying agent C containing MgO, the cyan elution concentration of the dehydrated cake can be reduced to the soil environment standard or less (Table 3), but when using the blast furnace cement B type as the conventional cement-based solidifying agent. In this case, the elution concentration of cyanide in the dehydrated cake could not be lower than the soil environmental standard, and hexavalent chromium, which was thought to have been contained in the cement in the filtrate, was eluted beyond the soil environmental standard (Table 4).
〔参考例３〕
現場から採取したシルト（含水比＝６９．６％、砂分＝３５％、シルト・粘土分＝６５％、密度＝１．５８g/cm3）の重金属類溶出試験結果は表５のようであった。上記重金属類汚染土１ｍ3に下記組成の固化剤を１５（質量／容量）％添加攪拌混合して固化せしめた。上記固化処理から２８日後の固化体の環境庁告示第４６号による溶出試験結果を表５に示す。
固化剤Ｄの組成
軽焼酸化マグネシウム １００質量部
硫酸カルシウム（半水石膏） ２０質量部
二酸化ケイ素（ホワイトカーボン） １０質量部
[Reference Example 3]
Table 5 shows the results of the elution test of heavy metals collected from the site (water content = 69.6%, sand = 35%, silt / clay = 65%, density = 1.58 g / cm 3 ). It was. 15 ml (mass / volume)% of a solidifying agent having the following composition was added to 1 m 3 of the above-mentioned heavy metal contaminated soil and mixed by stirring to solidify. Table 5 shows the results of dissolution tests according to Environmental Agency Notification No. 46 of the solidified product 28 days after the above solidification treatment.
Composition of solidifying agent D Light-burned magnesium oxide 100 parts by mass Calcium sulfate (hemihydrate gypsum) 20 parts by mass Silicon dioxide (white carbon) 10 parts by mass
上記固化体の２８日後の一軸圧縮強度は２，５００KN/m2、ｐＨは９．３であった。
The uniaxial compressive strength after 28 days of the solidified product was 2,500 KN / m 2 , and the pH was 9.3.
〔実施例２〕
現場から採取した有機質底泥（含水比＝１８３％、湿潤密度＝１．２８３g/cm3、強熱減量＝１７．４％）の全リンおよび全窒素の含有量は表６に示す通りであった。上記有機質底泥１ｍ3に対して下記組成の固化剤Ｅを４（質量／容量）％添加し、フィルタープレスで脱水・固化し、７日後に実施した環境庁告示第４６号による溶出試験結果を表６に示す。
固化剤Ｅの組成
軽焼酸化マグネシウム １００質量部
ＰＡＣ ５０質量部
塩化第２鉄 ５０質量部
[Example 2]
Table 6 shows the contents of total phosphorus and total nitrogen in organic bottom mud collected from the field (water content = 183%, wet density = 1.283 g / cm 3 , loss on ignition = 17.4%). It was. The organic base was added to the mud 1 m 3 of the solidifying agent E having the following composition 4 (mass / volume)%, dried and solidified with a filter press, a dissolution test results of the Environment Agency Notification No. 46 was conducted after 7 days Table 6 shows.
Composition of solidifying agent E Lightly burned magnesium oxide 100 parts by mass PAC 50 parts by mass Ferric chloride 50 parts by mass
濾水および脱水ケーキからの全リンおよび全窒素の溶出量は、排水基準を大きく下回った。
The amount of total phosphorus and total nitrogen eluted from the filtrate and dehydrated cake was well below the drainage standard.
〔参考例４〕
トリクロロエチレン（トリクレン）で汚染された地区の地下ＧＬ−５ｍ地点の土壌をコアーサンプリングしてトリクレン汚染土壌の試料とした。該試料の性状は下記の通りである。
含水比１１４％、砂分４９．５％、シルト分２６．０％、粘土２４．５％、密度１．４１３g/cm3
該試料を直ちに水質分析法に従って抽出分析を行い、トリクロロエチレン（トリクレン）の含有濃度を測定した。該試料１ｍ3に下記組成の固化剤Ｆを１０（質量／容量）％の割合で添加混合して固化せしめた。上記固化処理から２８日後の固化体を環境庁告示４６号による水質分析法に従ってトリクロロエチレンを抽出分析した。結果を表７に示す。
固化剤Ｆの組成
軽焼酸化マグネシウム ３質量部
硫酸第一鉄 ７質量部
水 １０質量部
[Reference Example 4]
The soil of the underground GL-5m point of the district contaminated with trichlorethylene (trichlene) was core-sampled to obtain a sample of trichrene-contaminated soil. The properties of the sample are as follows.
Water content 114%, sand content 49.5%, silt content 26.0%, clay 24.5%, density 1.413 g / cm 3
The sample was immediately subjected to extraction analysis according to a water quality analysis method, and the content concentration of trichlorethylene (tricrene) was measured. The solidifying agent F having the following composition was added to 1 m 3 of the sample at a ratio of 10 (mass / volume)% and mixed to be solidified. Trichlorethylene was extracted and analyzed from the solidified product 28 days after the solidification treatment according to the water quality analysis method of Environment Agency Notification No. 46. The results are shown in Table 7.
Composition of solidifying agent F Light-burned magnesium oxide 3 parts by mass Ferrous sulfate 7 parts by mass Water 10 parts by mass
上記固化体の２８日後の強度はコーン指数３００KN/m2、ｐＨ６．９であった。
The strength of the solidified product after 28 days was a corn index of 300 KN / m 2 and a pH of 6.9.
処理後の固化体から抽出されたクロロエチレンの溶出量は原土に比べて６０分の１程度と大巾に減少した。 The elution amount of chloroethylene extracted from the solidified material after the treatment was greatly reduced to about 1/60 of that of the raw soil.
Claims (6)
有害物質汚染土壌に添加されて該土壌を固化させると共に該土壌に含有されている有害物質を不溶化させる、有害物質汚染土壌用固化不溶化剤。 MgO and / or MgO-containing material, and solidification insolubilization aid containing ferric chloride,
A solidifying and insolubilizing agent for toxic substance-contaminated soil, which is added to toxic substance-contaminated soil to solidify the soil and insolubilize toxic substances contained in the soil.
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| Publication number | Publication date |
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| JP5576037B2 (en) | 2014-08-20 |
| JP2009013427A (en) | 2009-01-22 |
| JP4990865B2 (en) | 2012-08-01 |
| JP2014184437A (en) | 2014-10-02 |
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