JP2009013427A - Agent for solidifying and insolubilizing soil and soil treating method - Google Patents
Agent for solidifying and insolubilizing soil and soil treating method Download PDFInfo
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Description
本発明は、重金属、シアン、リン、窒素、ヒ素、ホウ素である有害物質によって汚染された土壌の土壌用固化不溶化剤および土壌処理方法に関するものである。 The present invention relates to a solidifying and insolubilizing agent for soil and a soil treatment method for soil contaminated with harmful substances such as heavy metals, cyanide, phosphorus, nitrogen, arsenic, and boron .
〔発明の背景〕
近年、工業の発展に併ない工場等から排出されるシアン、リン、窒素またはヒ素等の汚染物質による土壌汚染も顕著になってきている。
BACKGROUND OF THE INVENTION
In recent years, soil contamination due to contaminants such as cyan, phosphorus, nitrogen or arsenic discharged from factories and the like along with industrial development has become remarkable.
〔従来の技術〕
従来は、重金属類汚染土壌に対しては、該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, for heavy metal-contaminated soil, a method of removing the soil and replacing it with a new non-contaminated soil, a method of treating heavy metal-contaminated soil at a high temperature and melting it to sequester heavy metals, A method of containing heavy metals by solidifying and insolubilizing with cement and a cement-based solidifying agent has been adopted (see, for example, Patent Document 1).
しかし重金属以外の汚染物質例えばシアン、リン、窒素、ヒ素、ホウ素等に関しては、今まで有効な処理方法が提供されていなかった。 However, for pollutants other than heavy metals such as cyan, phosphorus, nitrogen , arsenic and boron , no effective treatment method has been provided so far.
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含有材を含み、重金属と、シアン、リン、窒素、ヒ素およびホウ素から選ばれる少なくとも一つの元素と、を含む有害物質を不溶化する土壌用固化不溶化剤を提供するものである。また、酸性アルミニウム塩、酸性鉄塩および酸性リン酸塩類から選ばれる少なくとも一つの第1固化不溶化助剤、ならびに、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選ばれる少なくとも一つの第2固化不溶化助剤の少なくとも一方を含むことが好ましい。更に、活性炭、ゼオライトおよびケイ藻土から選ばれる少なくとも一つの第3固化不溶化助剤を含むことが好ましい。更に本発明は、MgO含有材を含む土壌用固化不溶化剤を、重金属と、シアン、リン、窒素、ヒ素およびホウ素から選ばれる少なくとも一つの元素と、を含む有害物質を含有する汚染土壌に添加して、汚染土壌を固化不溶化し、有害物質が封鎖された固化土を得る、土壌処理方法を提供するものである。また、土壌用固化不溶化剤は、酸性アルミニウム塩、酸性鉄塩および酸性リン酸塩類から選ばれる少なくとも一つの第1固化不溶化助剤、ならびに、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選ばれる少なくとも一つの第2固化不溶化助剤の少なくとも一方を含むことが好ましい。更に、固化不溶化を機械的脱水固化によりおこなうことが好ましい。 As a means for solving the above-described conventional problems, the present invention includes a MgO-containing material, and insolubilizes a hazardous substance containing a heavy metal and at least one element selected from cyan, phosphorus, nitrogen, arsenic and boron. A solidifying and insolubilizing agent is provided. Also, at least one first solidification and insolubilization aid selected from acidic aluminum salts, acidic iron salts and acidic phosphates, and at least one second selected from calcium salt, magnesium salt, blast furnace slag, silicon dioxide and perlite. It is preferable that at least one of the solidification insolubilization aid is included. Furthermore, it is preferable to include at least one third solidification and insolubilization aid selected from activated carbon, zeolite and diatomaceous earth. Furthermore, the present invention adds a soil solidifying and insolubilizing agent containing an MgO-containing material to contaminated soil containing a heavy metal and at least one element selected from cyan, phosphorus, nitrogen, arsenic and boron. Thus, the present invention provides a soil treatment method in which contaminated soil is solidified and insolubilized to obtain solidified soil sealed with harmful substances. Further, the solidification insolubilizer for soil includes at least one first solidification insolubilization aid selected from acidic aluminum salt, acidic iron salt and acidic phosphates, and calcium salt, magnesium salt, blast furnace slag, silicon dioxide and perlite. It is preferable to include at least one of at least one second solidification insolubilization aid selected. Furthermore, it is preferable to perform solidification insolubilization by mechanical dehydration solidification.
〔作用〕
MgOは低アルカリ性でありかつシアン、リン、窒素、ヒ素、ホウ素等の土壌に含まれている汚染物質の溶出に対する不溶化力に優れている。MgOに助剤を添加すると、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。
[Action]
MgO has low alkalinity and is excellent in insolubilizing power against elution of pollutants contained in soil such as cyan, phosphorus, nitrogen , arsenic and boron . When an auxiliary agent is added to MgO, the solidified soil is further reduced in alkalinity, the solidification rate 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.
〔効果〕
本発明においては、シアン、リン、窒素、ヒ素、ホウ素である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。
〔effect〕
In the present invention, soil contaminated with toxic substances such as cyan, phosphorus, nitrogen, arsenic , and boron is solidified and insolubilized with MgO in a pH range that does not interfere with plant growth, and the toxic substances are re-dissolved in the solidified soil without re-elution. Can be blocked.
本発明を以下に詳細に説明する。
〔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。
The present invention is described in detail below.
[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。 Moreover, from the contaminated soil having a low water content of 50% or less to the contaminated soil having a medium water content of 50 to 150%, the first auxiliary agent, aluminum sulfate, is effective, and in particular, the solidification that promotes 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、窒素、リン、ホウ素、ヒ素、シアンがある。
〔Hazardous substance〕
In the present invention, harmful substances contained in contaminated soil include nitrogen, phosphorus, boron, arsenic, and cyanide.
〔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。いずれを選ぶかは、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 property of the target soil, the type of toxic substance, the soil quality, the water content ratio, the particle size, etc. are taken into consideration when selecting which one.
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.
〔実施例1〕
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)の重金属類およびヒ素の溶出試験を下記の通り行った。上記重金属類およびヒ素によって汚染された砂質土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 実施例
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
[Example 1]
Elution test of heavy metals and arsenic of sandy soil (water content = 21.5%, gravel / sand content = 73%, silt / clay content = 27%, density = 1.76 g / cm 3 ) collected from the site It went as follows. The heavy metals and was allowed solidified been in sandy soil 1 m 3 of the solidifying agent A having the following composition were mixed 15 (mass / volume)% added stirred contaminated by arsenic. Table 1 shows the results of the dissolution test by the Environmental Agency Notification No. 46 of the solidified product 28 days after the solidification treatment.
Composition of solidifying agent A Example Light-burned magnesium oxide 100 parts by mass Ferrous sulfate 50 parts by mass Perphosphate lime 50 parts by mass
表1の結果から、MgOを含有する固化剤Aを用いた実施例では、鉛、ヒ素、6価クロム共に土壌環境基準以下に不溶化出来た。
上記実施例の固化体の28日後の一軸圧縮強度は2,050KN/m2、pHは10.3であった。
From the results of Table 1, in the example using the solidifying agent A containing MgO, lead, arsenic and hexavalent chromium were all insolubilized below the soil environmental standard.
The uniaxial compressive strength after 28 days of the solidified body of the above Example was 2,050 KN / m 2 , and the pH was 10.3.
〔実施例2〕
シアンを含むスラッジ(含水比=398%、比重=1.129)の性状は、表2に示す通りであった。この試料1m3に下記組成の固化剤B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2に示す。
固化剤Bの組成 実施例2 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 2]
Table 2 shows the properties of the sludge containing cyan (water content ratio = 398%, specific gravity = 1.129). Table 2 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 B having the following composition to 1 m 3 of this sample, filter press dehydrating and solidifying.
Composition of solidifying agent B Example 2 Comparative example Light calcined 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B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2)、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3)。 By using the solidifying agent B containing MgO, the cyan elution concentration of the dehydrated cake can be made below the soil environment standard (Table 2), but when using the blast furnace cement type B as a cement-based solidifying agent which is a conventional technology. , The cyan elution concentration of the dehydrated cake could not be made lower than the soil environmental standard, and hexavalent chromium, which seems to have been contained in the cement in the drainage water, eluted beyond the soil environmental standard (Table 3).
〔実施例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)の重金属類およびヒ素の溶出試験結果は表5のようであった。上記重金属類およびヒ素によって汚染された汚染土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4に示す。
固化剤C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
Example 3
Table 5 shows the results of dissolution tests of heavy metals and arsenic from silt (water content ratio = 69.6%, sand content = 35%, silt / clay content = 65%, density = 1.58 g / cm 3 ) collected from the field. It seemed. 15 ml (mass / volume) of a solidifying agent having the following composition was added to 1 m 3 of contaminated soil contaminated with heavy metals and arsenic, and the mixture was solidified by stirring. Table 4 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 C Lightly burned magnesium oxide 100 parts by weight Calcium sulfate (hemihydrate gypsum) 20 parts by weight Silicon dioxide (white carbon) 10 parts by weight
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4〕
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5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 4
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 5 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 significantly below the drainage standard.
Claims (6)
重金属と、シアン、リン、窒素、ヒ素およびホウ素から選ばれる少なくとも一つの元素と、を含む有害物質を不溶化する土壌用固化不溶化剤。 A solidifying and insolubilizing agent for soil which insolubilizes harmful substances containing heavy metals and at least one element selected from cyan, phosphorus, nitrogen, arsenic and boron.
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