JP2008200628A - Heavy metal treating agent and method for treating heavy metal contaminants using the same - Google Patents
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Abstract
【課題】 有害なカチオン種及びアニオン種で複合汚染されたリン含有重金属汚染物質では、硫化鉄を用いた重金属処理では、重金属の処理性能が不十分であった。
【解決手段】 カチオン種及びアニオン種の重金属で複合汚染されたリン含有重金属汚染物質に、硫化鉄、及びアルカリ土類金属塩を含んでなる重金属処理剤を用いて処理する。さらにアミンのカルボジチオ酸塩を含むことが好ましく、特にピペラジン−Ｎ，Ｎ’−ビスカルボジチオ酸塩を含んでなるものが好ましい。
【選択図】 なしPROBLEM TO BE SOLVED: To treat heavy metals with a heavy metal treatment using iron sulfide in a phosphorus-containing heavy metal pollutant complex-contaminated with harmful cationic species and anionic species.
SOLUTION: A phosphorus-containing heavy metal pollutant complex-contaminated with cationic and anionic heavy metals is treated with a heavy metal treating agent containing iron sulfide and an alkaline earth metal salt. Further, it preferably contains an amine carbodithioate, and particularly preferably contains a piperazine-N, N′-biscarbodithioate.
[Selection figure] None
Description
本発明は、重金属を含有する固体廃棄物、例えば、ゴミ焼却場から排出される焼却灰及び飛灰、重金属に汚染された土壌、排水処理後に生じる汚泥、工場から排出される排水等に含有される鉛、カドミウム、水銀、ヒ素、セレン、６価クロム等の有害な重金属を簡便、かつ高効率で安定的に固定化することのできる組成物およびそれを用いた重金属処理剤、並びに重金属汚染物質の処理方法に関するものである。 The present invention is contained in solid waste containing heavy metals, for example, incineration ash and fly ash discharged from garbage incineration plants, soil contaminated with heavy metals, sludge generated after wastewater treatment, wastewater discharged from factories, etc. , A composition capable of easily and stably immobilizing harmful heavy metals such as lead, cadmium, mercury, arsenic, selenium, hexavalent chromium, etc., a heavy metal treating agent using the same, and heavy metal contaminants Is related to the processing method.
都市ゴミ焼却工場などから排出される飛灰は重金属含有率が高く、重金属の溶出を抑制する処理を施すことが必要である。その様な処理方法のひとつとして薬剤処理法があり、キレート系薬剤等の重金属処理剤を添加して重金属を不溶化する方法が用いられている。 Fly ash discharged from municipal waste incineration plants has a high heavy metal content and needs to be treated to prevent elution of heavy metals. As one of such treatment methods, there is a drug treatment method, and a method of insolubilizing heavy metals by adding a heavy metal treatment agent such as a chelate-type drug is used.
キレート系薬剤としてはアミン誘導体のカルボジチオ酸塩が主に用いられている。特にピペラジンカルボジチオ酸塩は他のアミン誘導体と比較しても硫化水素及び二硫化炭素等の有害ガス発生が少ないことが、重金属処理剤として広く用いられている。（例えば特許文献１参照）しかし重金属汚染物質に含有されるヒ素、セレン、６価クロム等はアニオン種の形態で存在し、アミン誘導体のカルボジチオ酸塩などのキレート系薬剤で処理することは困難であった。 As chelating agents, carbodithioates of amine derivatives are mainly used. In particular, piperazine carbodithioate is widely used as a heavy metal treating agent because it produces less harmful gases such as hydrogen sulfide and carbon disulfide than other amine derivatives. (For example, see Patent Document 1) However, arsenic, selenium, hexavalent chromium, etc. contained in heavy metal contaminants exist in the form of anionic species, and it is difficult to treat with chelating agents such as carbodithioates of amine derivatives. there were.
それに対して、重金属汚染物質を硫化鉄で処理する方法が知られている。（例えば特許文献２）しかし、硫化鉄を用いてもヒ素、セレン、６価クロム等のアニオン種に関して効果が不十分な場合があり、さらには硫化鉄では鉛やカドミウム、水銀といったカチオン種に対しても効果が弱いという問題があった。さらに硫化鉄は粉体状で用いられたため、粉体供給設備が必要であるなど取り扱いの面でも問題があった。 On the other hand, a method of treating heavy metal contaminants with iron sulfide is known. (For example, Patent Document 2) However, even if iron sulfide is used, there are cases where the effect of anion species such as arsenic, selenium, hexavalent chromium, etc. is insufficient, and iron sulfide is more effective against cationic species such as lead, cadmium, and mercury. However, there was a problem that the effect was weak. Furthermore, since iron sulfide was used in powder form, there was a problem in handling such as the need for powder supply equipment.
一方、硫化鉄のスラリー剤を用いる方法が知られている。（例えば特許文献３）しかし、硫化鉄スラリー単独ではスラリー剤とすることで、取り扱いやすくはなったものの、ヒ素、セレン、６価クロム等のアニオン種に関して効果が不十分な場合があり、鉛やカドミウム、水銀といったカチオン種に対しての効果が十分ではなかった。 On the other hand, a method using a slurry of iron sulfide is known. (For example, Patent Document 3) However, by using an iron sulfide slurry alone as a slurry agent, it becomes easy to handle, but there are cases where the effect is insufficient with respect to anion species such as arsenic, selenium, hexavalent chromium, lead, The effect on cation species such as cadmium and mercury was not sufficient.
本発明は、重金属汚染物質、特にリンを含有する重金属汚染物質においてヒ素、セレン、６価クロム等の有害なアニオン種を確実に処理でき、同時に複合汚染された鉛、カドミウム、水銀等の有害なカチオン種を同時に処理することができる重金属処理剤及びそれを用いた処理方法を提供するものである。 The present invention can reliably treat harmful anionic species such as arsenic, selenium and hexavalent chromium in heavy metal pollutants, especially heavy metal pollutants containing phosphorus, and at the same time harmful compounds such as complex contaminated lead, cadmium and mercury. It is an object of the present invention to provide a heavy metal treating agent capable of treating cationic species at the same time and a treating method using the same.
本発明者らは、上記の課題を解決すべく鋭意検討を重ねた結果、６価クロム、セレン、ヒ素等の有害なアニオン種を含む重金属汚染物質において従来の硫化鉄による処理が十分進まないものは、特にリンが含まれる重金属汚染物質であり、その様なリン含有重金属汚染物質は、硫化鉄とリンと難溶性の塩を形成するアルカリ土類金属化合物及び水を含んでなる重金属処理剤を用いることにより、有害なアニオン種種を安全に処理することが可能であることを見出した。さらにアミンのカルボジチオ酸塩と同時に用いることによりカチオン種の重金属も同時に高度に処理できることを見出し、本発明を完成するに至った。 As a result of intensive studies to solve the above problems, the present inventors have not sufficiently advanced conventional treatment with iron sulfide in heavy metal pollutants containing harmful anionic species such as hexavalent chromium, selenium and arsenic. Is a heavy metal pollutant containing phosphorus in particular, and such a phosphorus-containing heavy metal pollutant includes an alkaline earth metal compound that forms a sparingly soluble salt with iron sulfide and phosphorus and a heavy metal treating agent containing water. It has been found that by using it, harmful anionic species can be safely treated. Furthermore, the present inventors have found that by using the amine carbodithioate together with the carbodithioate, the heavy metal of the cation species can be treated at the same time, and the present invention has been completed.
以下、本発明の重金属処理剤および重金属汚染物質の処理法についてその詳細を説明する。 Hereinafter, the heavy metal treating agent and the method for treating heavy metal contaminants of the present invention will be described in detail.
本発明の重金属処理剤は硫化鉄とアルカリ土類金属化合物及び水を含んでなるものである。硫化鉄にアルカリ土類金属化合物を加えることで、重金属汚染物質中に含まれ、重金属処理を阻害するリン（特にリン酸）を不溶化除去し、安定的に有害アニオン種に汚染された重金属汚染物質を処理することができる。リンの及ぼす影響のメカニズムは定かではないが、リンが存在することにより、有害アニオン種、特にヒ素の不溶化が阻害される。 The heavy metal treating agent of the present invention comprises iron sulfide, an alkaline earth metal compound and water. By adding alkaline earth metal compounds to iron sulfide, the heavy metals pollutants contained in heavy metal pollutants and insolubilize and remove phosphorus (especially phosphoric acid) that inhibits heavy metal treatment, and are stably contaminated with harmful anion species. Can be processed. The mechanism of the effect of phosphorus is not clear, but the presence of phosphorus inhibits the insolubilization of harmful anionic species, especially arsenic.
本発明の重金属処理剤における硫化鉄としては、特に限定されるものではないが、結晶構造がマキナワイト構造であることが好ましい。マキナワイト構造ではピロータイト構造に比べて処理能力が高い。 The iron sulfide in the heavy metal treating agent of the present invention is not particularly limited, but the crystal structure is preferably a makinawite structure. The makinawite structure has a higher processing capacity than the pilotite structure.
本発明の重金属処理剤における硫化鉄の濃度は高い方が好ましく、１〜４０重量％、特に５〜３０重量％の範囲が好ましい。硫化鉄濃度が低いと重金属処理能が低下し、高すぎると粘性が高くなり操作性が悪くなる。 The concentration of iron sulfide in the heavy metal treating agent of the present invention is preferably high, and is preferably in the range of 1 to 40% by weight, particularly 5 to 30% by weight. If the iron sulfide concentration is low, the ability to treat heavy metals decreases, and if it is too high, the viscosity increases and the operability deteriorates.
本発明の重金属処理剤におけるアルカリ土類金属化合物は、特に限定されるものではないが、例えば、カルシウム化合物、マグネシウム化合物、ストロンチウム化合物、バリウム化合物等が挙げられる。特に安価で入手しやすいカルシウム化合物、マグネシウム化合物が好ましい。カルシウム化合物、マグネシウム化合物としては、塩化物、水酸化物、硫化物、硫酸塩、炭酸塩、亜硫酸塩、チオ硫酸塩、珪酸塩等が挙げられる。特に安価で入手しやすい点、溶解度の点で水酸化物、塩化物が好ましい。用いるアルカリ土類金属化合物の溶解度が低い場合、重金属汚染物質中に含まれるリンを不溶化しにくく、重金属処理性能が阻害される。 The alkaline earth metal compound in the heavy metal treating agent of the present invention is not particularly limited, and examples thereof include calcium compounds, magnesium compounds, strontium compounds, barium compounds and the like. In particular, calcium compounds and magnesium compounds that are inexpensive and easily available are preferred. Examples of calcium compounds and magnesium compounds include chlorides, hydroxides, sulfides, sulfates, carbonates, sulfites, thiosulfates, and silicates. Hydroxides and chlorides are particularly preferable from the viewpoint of being inexpensive and easily available, and solubility. When the solubility of the alkaline earth metal compound to be used is low, it is difficult to insolubilize phosphorus contained in the heavy metal contaminant, and the heavy metal treatment performance is hindered.
本発明の重金属処理剤におけるアルカリ土類金属化合物の濃度は重金属汚染物質中のリンの含有量やリンの形態等により異なるが、１〜５０重量％、特に５〜3０重量％の範囲、さらには処理する重金属汚染物質中のリンをリン酸換算し当該リン酸がアルカリ土類金属塩を形成する当量以上であることが好ましい。アルカリ土類金属化合物の濃度が低いとリンを不溶化が不十分となり、高すぎると、粘性が高くなり操作性が悪くなる。 The concentration of the alkaline earth metal compound in the heavy metal treating agent of the present invention varies depending on the phosphorus content, the form of phosphorus, etc. in the heavy metal contaminant, but it is in the range of 1 to 50% by weight, particularly 5 to 30% by weight, The phosphorus in the heavy metal contaminant to be treated is preferably converted to phosphoric acid, and the phosphoric acid is preferably equal to or more than the equivalent of forming an alkaline earth metal salt. When the concentration of the alkaline earth metal compound is low, insolubilization of phosphorus becomes insufficient, and when it is too high, the viscosity becomes high and the operability deteriorates.
本発明の重金属処理剤では、さらにアミンのカルボジチオ酸塩を加えることによりカチオン系の重金属に対する重金属処理能力が向上できる。アミンのカルボジチオ酸塩を加えることにより、ヒ素、セレン、６価クロム等の有害アニオン種に加え、硫化鉄では処理が不十分である鉛、カドミウム、水銀等の有害カチオン種をも処理することができる。 In the heavy metal treating agent of the present invention, the ability to treat heavy metals with respect to cationic heavy metals can be improved by further adding an amine carbodithioate. By adding carbodithioate of amine, in addition to harmful anion species such as arsenic, selenium and hexavalent chromium, it can also treat harmful cationic species such as lead, cadmium and mercury that are not sufficiently treated with iron sulfide. it can.
アミンのカルボジチオ酸塩としては、特に限定されるものではないが、例えば、ジエチルアミン、エチレンジアミン、ジエチレントリアミン、トリエチレンテトラミン、テトラエチレンペンタミン、ピペラジン等のアミンから得られるカルボジチオ酸塩が例示される。特にピペラジンカルボジチオ酸塩が耐熱性、耐酸性が高く、有害ガスを発生しないため好ましい。 Although it does not specifically limit as a carbodithioate of an amine, For example, the carbodithioate obtained from amines, such as diethylamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, piperazine, is illustrated. Piperazine carbodithioate is particularly preferable because it has high heat resistance and acid resistance and does not generate harmful gases.
ピペラジンカルボジチオ酸塩としては、ピペラジン−Ｎ−カルボジチオ酸塩、ピペラジン−Ｎ，Ｎ’−ビスカルボジチオ酸塩、又はそれらの混合物が例示できる。特にピペラジン−Ｎ，Ｎ’−ビスカルボジチオ酸塩、又はその比率の高いものが好ましい。これらの塩としては、アルカリ金属塩、アルカリ土類金属塩、アンモニウム塩が用いられるが、熱的安定性、溶解性の点からナトリウム塩、カリウム塩が好ましい。 Examples of the piperazine carbodithioate include piperazine-N-carbodithioate, piperazine-N, N′-biscarbodithioate, or a mixture thereof. In particular, piperazine-N, N′-biscarbodithioate or a compound having a high ratio thereof is preferable. As these salts, alkali metal salts, alkaline earth metal salts, and ammonium salts are used, and sodium salts and potassium salts are preferable from the viewpoint of thermal stability and solubility.
本発明の重金属処理剤にアミンのカルボジチオ酸塩を加える場合、その濃度は重金属汚染物質中の有害カチオン種の含有量や形態によっても異なるが、高い方が好ましく、１〜６０重量％、特に５〜４０重量％の範囲が好ましい。アミンのカルボジチオ酸塩の濃度が低いと重金属処理の効果が低く、高すぎると粘性等の点で操作性が悪くなる。 When the amine carbodithioate is added to the heavy metal treating agent of the present invention, the concentration varies depending on the content and form of harmful cation species in the heavy metal pollutant, but the higher one is preferable, and it is preferably 1 to 60% by weight, particularly 5%. A range of ˜40% by weight is preferred. If the amine carbodithioate concentration is low, the effect of the heavy metal treatment is low, and if it is too high, the operability is poor in terms of viscosity and the like.
硫化鉄は固形であるため、アミンのカルボジチオ酸塩と反応して、アミンのカルボジチオ酸塩によるカチオン処理能力を低下することがない。 Since iron sulfide is a solid, it does not react with the amine carbodithioate to reduce the ability to treat the cation with the amine carbodithioate.
本発明の重金属処理剤には、本発明の効果を妨げない範囲で他の成分を含んでもよい。他の成分としては、水、有機溶媒、アミン、アルカリ水酸化物等が例示できる。 The heavy metal treating agent of the present invention may contain other components as long as the effects of the present invention are not hindered. Examples of other components include water, organic solvents, amines, and alkali hydroxides.
本発明の重金属処理剤を用いた重金属汚染物質の処理方法は、特に限定されるものではなく、本発明の重金属処理剤（又はその各成分を別々に添加する場合を含む）と重金属汚染物質を混合すればよい。 The method for treating heavy metal contaminants using the heavy metal treating agent of the present invention is not particularly limited, and includes the heavy metal treating agent of the present invention (or the case where each component thereof is added separately) and the heavy metal contaminant. What is necessary is just to mix.
本発明の重金属処理剤の使用量は重金属汚染物質の状態、重金属の含有量や重金属の形態により異なるが、通常、飛灰に対しては０．０１〜３０重量％の範囲で使用される。また、処理を容易にするために、処理物に対して１〜５０重量％の加湿水を混練時に添加してもよい。 The amount of the heavy metal treating agent of the present invention varies depending on the state of heavy metal contaminants, the content of heavy metals and the form of heavy metals, but is usually used in the range of 0.01 to 30% by weight with respect to fly ash. Moreover, in order to make a process easy, you may add 1-50 weight% humidified water with respect to a processed material at the time of kneading | mixing.
また、本発明の重金属汚染物質の処理方法では、重金属汚染物質の状態、重金属の含有量や重金属の形態、リンの含有量やリンの形態により、硫化鉄、アルカリ土類金属化合物、アミンのカルボジチオ酸塩を別々に添加し、混合して処理することもできる。 Further, in the method for treating heavy metal pollutants according to the present invention, iron sulfide, alkaline earth metal compound, amine carbodithio, depending on the state of heavy metal pollutants, heavy metal content and heavy metal form, phosphorus content and phosphorus form. The acid salts can be added separately and mixed for processing.
リンの含有量が高い場合、リンの形態の大部分がリン酸化合物である場合、アルカリ土類金属化合物の効果を十分に発揮させるため、アルカリ土類金属化合物を硫化鉄よりも先に添加することが好ましい。 When the content of phosphorus is high, when most of the form of phosphorus is a phosphoric acid compound, the alkaline earth metal compound is added prior to iron sulfide in order to fully exert the effect of the alkaline earth metal compound It is preferable.
本発明における重金属汚染物質は重金属を含有する物質であれば特に限定されるものではないが、飛灰、土壌、スラッジ、排水等が例示される。 Although the heavy metal contaminant in this invention will not be specifically limited if it is a substance containing a heavy metal, Fly ash, soil, sludge, drainage, etc. are illustrated.
これらの重金属汚染物質中の有害な重金属としては鉛、カドミウム、水銀、ヒ素、セレン、６価クロムのいずれかを含有する物質が例示できる。 Examples of harmful heavy metals in these heavy metal contaminants include substances containing any of lead, cadmium, mercury, arsenic, selenium, and hexavalent chromium.
本発明の重金属処理剤では、ヒ素、セレン、６価クロム等のアニオン種を安全に処理でき、特に重金属含有物中に共存するリン酸の影響によって有害な重金属の処理が不安定となるという問題がない。さらにアミンのカルボジチオ酸塩を加えることにより、有害アニオン種と有害カチオン種に複合汚染された重金属汚染物質を同時に処理できる。 The heavy metal treating agent of the present invention can safely treat anionic species such as arsenic, selenium, and hexavalent chromium, and in particular, the treatment of harmful heavy metals becomes unstable due to the influence of phosphoric acid coexisting in the heavy metal-containing material. There is no. Further, by adding an amine carbodithioate, it is possible to simultaneously treat heavy metal contaminants contaminated with harmful anionic species and harmful cationic species.
以下本発明を実施例で説明するが、本発明はこれら実施例に限定されるものではない。 EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.
実施例１
飛灰（Ｃａ＝２．０％、Ｍｇ＝０．０％、Ｎａ＝１８．７％，Ｋ＝２．９％，Ｐｂ＝５１００ｐｐｍ，Ｐ＝５０００ｐｐｍ，Ｃｄ＝８３ｐｐｍ，Ａｓ＝３６ｐｐｍを含む）５０重量部に対し、水８重量部（飛灰に対して１６重量％）と、本発明の混合組成物（硫化鉄１０重量％と水酸化カルシウム１０重量％、ピペラジン−Ｎ，Ｎ’−ビスカルボジチオ酸塩４重量％を含む）を４重量部加え、混練した。
Example 1
Fly ash (Ca = 2.0%, Mg = 0.0%, Na = 18.7%, K = 2.9%, Pb = 5100 ppm, P = 5000 ppm, Cd = 83 ppm, As = 36 ppm included) 50 8 parts by weight of water (16% by weight with respect to fly ash) and 10% by weight of iron sulfide and 10% by weight of calcium hydroxide, piperazine-N, N′-biscarbo 4 parts by weight of a dithioate salt (containing 4% by weight) was added and kneaded.
処理後、昭和４８年環境庁告示１３号試験に従い溶出試験を行った。重金属の溶出結果を表１に示す。ヒ素、鉛、カドミウムの溶出は基準値を下回り、不溶化された。 After the treatment, a dissolution test was conducted according to the Environmental Agency Notification No. 13 test in 1973. Table 1 shows the elution results of heavy metals. The elution of arsenic, lead and cadmium was below the standard value and insolubilized.
実施例２
飛灰（Ｃａ＝１．６％、Ｍｇ＝０．０％、Ｎａ＝１．６％，Ｋ＝１．５％，Ｐｂ＝９０００ｐｐｍ，Ｐ＝３２０００ｐｐｍ，Ｃｄ＝２００ｐｐｍ，Ａｓ＝５３０ｐｐｍを含む）５０重量部に対し、水１０重量部（飛灰に対して２０重量％）と、硫化鉄スラリー（硫化鉄１３．５重量％を含む）を２重量部（飛灰に対して４重量％）、水酸化カルシウムを２重量部（飛灰に対して４重量％）、ピペラジン−Ｎ，Ｎ’−ビスカルボジチオ酸塩水溶液（ピペラジン−Ｎ，Ｎ’−ビスカルボジチオ酸塩を４０重量％含む）２重量部（飛灰に対して４重量％）を加え、混練した。
Example 2
Fly ash (Ca = 1.6%, Mg = 0.0%, Na = 1.6%, K = 1.5%, Pb = 9000 ppm, P = 32000 ppm, Cd = 200 ppm, including As = 530 ppm) 50 10 parts by weight of water (20% by weight with respect to fly ash) and 2 parts by weight (4% by weight with respect to fly ash) of iron sulfide slurry (including 13.5% by weight of iron sulfide), 2 parts by weight of calcium hydroxide (4% by weight with respect to fly ash), piperazine-N, N′-biscarbodithioate aqueous solution (including piperazine-N, N′-biscarbodithioate 40% by weight) 2 parts by weight (4% by weight based on fly ash) was added and kneaded.
処理後、昭和４８年環境庁告示１３号試験に従い溶出試験を行った。重金属の溶出結果を表１に示す。ヒ素、鉛、カドミウムの溶出は基準値を下回り、不溶化された。 After the treatment, a dissolution test was conducted according to the Environmental Agency Notification No. 13 test in 1973. Table 1 shows the elution results of heavy metals. The elution of arsenic, lead and cadmium was below the standard value and insolubilized.
比較例１
実施例１と同様の飛灰５０重量部に対し、水８重量部（飛灰に対して１６重量％）と、硫化鉄とピペラジン−Ｎ，Ｎ’−ビスカルボジチオ酸塩水溶液の混合組成物（硫化鉄１０重量％、ピペラジン−Ｎ，Ｎ’−ビスカルボジチオ酸塩４重量％を含む）を４重量部（飛灰に対して８重量部）加え、混練した。
Comparative Example 1
A mixed composition of 8 parts by weight of water (16% by weight with respect to fly ash), iron sulfide and piperazine-N, N′-biscarbodithioate aqueous solution with respect to 50 parts by weight of fly ash similar to Example 1. 4 parts by weight (including 10 parts by weight of iron sulfide and 4% by weight of piperazine-N, N′-biscarbodithioate) (8 parts by weight with respect to fly ash) was added and kneaded.
処理後、昭和４８年環境庁告示１３号試験に従い溶出試験を行った。重金属の溶出結果を表１に示す。鉛とカドミウムは基準値を下回ったが、ヒ素の溶出は基準値を上回った。 After the treatment, a dissolution test was conducted according to the Environmental Agency Notification No. 13 test in 1973. Table 1 shows the elution results of heavy metals. Lead and cadmium were below the reference value, but arsenic elution was above the reference value.
比較例２
実施例２と同様の飛灰５０重量部に対し、水１０重量部（飛灰に対して２０重量％）と、硫化鉄スラリー（硫化鉄１３．５重量％を含む）を２重量部（飛灰に対して４重量％）、ピペラジン−Ｎ，Ｎ’−ビスカルボジチオ酸塩水溶液（ピペラジン−Ｎ，Ｎ’−ビスカルボジチオ酸塩を４０重量％含む）２重量部（飛灰に対して４重量％）を加え、混練した。
Comparative Example 2
10 parts by weight of water (20% by weight with respect to fly ash) and 2 parts by weight of iron sulfide slurry (including 13.5% by weight of iron sulfide) with respect to 50 parts by weight of fly ash as in Example 2. 4% by weight based on ash), 2 parts by weight of piperazine-N, N′-biscarbodithioate aqueous solution (containing piperazine-N, N′-biscarbodithioate 40% by weight) (based on fly ash) 4% by weight) was added and kneaded.
処理後、昭和４８年環境庁告示１３号試験に従い溶出試験を行った。重金属の溶出結果を表１に示す。鉛とカドミウムは基準値を下回ったが、ヒ素の溶出は基準値を上回った。 After the treatment, a dissolution test was conducted according to the Environmental Agency Notification No. 13 test in 1973. Table 1 shows the elution results of heavy metals. Lead and cadmium were below the reference value, but arsenic elution was above the reference value.
比較例では、飛灰に対する硫化鉄とピペラジン−Ｎ，Ｎ’−ビスカルボジチオ酸の添加量は同じであるにもかかわらず、ヒ素の処理が不十分であり、リンを含有する重金属複合汚染物質ではアルカリ金属塩の添加によってカチオン系とアニオン系双方の重金属を安定に処理できた。 In the comparative example, although the addition amounts of iron sulfide and piperazine-N, N′-biscarbodithioic acid to fly ash are the same, the arsenic treatment is insufficient, and the heavy metal composite pollutant containing phosphorus In addition, the addition of alkali metal salts could stably treat both cationic and anionic heavy metals.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102216410A (en) * | 2008-11-18 | 2011-10-12 | 东曹株式会社 | Solid heavy metal processing agent, method for producing same and use of same |
| JP2017518956A (en) * | 2014-05-02 | 2017-07-13 | レモンディス アクア ゲーエムベーハ アンド シーオー．ケージー | A method of purifying raw phosphoric acid (such as MGA acid) by adding ash derived from a waste incineration site, including the production of purified phosphoric acid, calcium sulfate, water-soluble calcium hydrogen phosphate and metal salt solution. |
| KR20210090951A (en) * | 2020-01-13 | 2021-07-21 | 주식회사 포스코건설 | Method for stabilizing heavy metals using byproducts of desulfurization |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102216410A (en) * | 2008-11-18 | 2011-10-12 | 东曹株式会社 | Solid heavy metal processing agent, method for producing same and use of same |
| CN102216410B (en) * | 2008-11-18 | 2014-10-15 | 东曹株式会社 | Solid heavy metal processing agent, method for producing same and use of same |
| JP2017518956A (en) * | 2014-05-02 | 2017-07-13 | レモンディス アクア ゲーエムベーハ アンド シーオー．ケージー | A method of purifying raw phosphoric acid (such as MGA acid) by adding ash derived from a waste incineration site, including the production of purified phosphoric acid, calcium sulfate, water-soluble calcium hydrogen phosphate and metal salt solution. |
| KR20210090951A (en) * | 2020-01-13 | 2021-07-21 | 주식회사 포스코건설 | Method for stabilizing heavy metals using byproducts of desulfurization |
| KR102347890B1 (en) | 2020-01-13 | 2022-01-05 | 주식회사 포스코건설 | Method for stabilizing heavy metals using byproducts of desulfurization |
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