JP2001121109A - Detoxicating method for construction waste containing soluble 6-valent chromium - Google Patents
Detoxicating method for construction waste containing soluble 6-valent chromiumInfo
- Publication number
- JP2001121109A JP2001121109A JP30674999A JP30674999A JP2001121109A JP 2001121109 A JP2001121109 A JP 2001121109A JP 30674999 A JP30674999 A JP 30674999A JP 30674999 A JP30674999 A JP 30674999A JP 2001121109 A JP2001121109 A JP 2001121109A
- Authority
- JP
- Japan
- Prior art keywords
- chromium
- construction waste
- hexavalent chromium
- soluble
- containing chromium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/58—Construction or demolition [C&D] waste
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、可溶性六価クロム
を含有する構築物廃材を不溶化して無害化する無害化処
理方法に関するものである。TECHNICAL FIELD The present invention relates to a detoxification method for insolubilizing and detoxifying construction waste containing soluble hexavalent chromium.
【０００２】[0002]
【従来の技術】従来、可溶性六価クロムを含有するコン
クリート等の構築物廃材の処理方法として、次のような
方法が提案されている。 密閉処理する方法。 セメントやシリカ等の水和物ゲルの吸着を利用し混入
固化する方法。 還元性雰囲気で加熱焼成処理する方法。 還元剤溶液を散布後に中和剤溶液を散布する方法。2. Description of the Related Art Conventionally, the following method has been proposed as a method for treating construction waste such as concrete containing soluble hexavalent chromium. A method of sealing. A method of mixing and solidifying using adsorption of hydrate gels such as cement and silica. Heat baking treatment in a reducing atmosphere. A method of spraying a neutralizing agent solution after spraying a reducing agent solution.
【０００３】上記の不溶化法は、金属、ガラス、アス
ファルト、コンクリートまたは樹脂等の容器に可溶性六
価クロムおよび可溶性重金属等を含有する構築物廃材を
物理的に封じ込める方法で、化学的な無害化処理を施さ
ないため、容器の破損等により、二次汚染を引き起こす
恐れがある。[0003] The insolubilization method described above is a method of physically enclosing construction waste containing soluble hexavalent chromium and soluble heavy metals in a container of metal, glass, asphalt, concrete or resin. Otherwise, secondary contamination may be caused by damage to the container.
【０００４】上記の方法は、電気化学的な水和物ゲル
の吸着と物理的な封じ込め効果を利用する方法である
が、ゲル生成のためにアルカリの過剰添加が必要であ
り、仮に還元剤を併用しても、長期的には還元吸着され
た三価のクロムが、過剰アルカリと酸素の影響により酸
化されて、水を介して六価クロムとして再溶出してしま
うという問題がある。[0004] The above-mentioned method is a method utilizing the electrochemical adsorption of a hydrate gel and the physical confinement effect. However, excessive addition of alkali is necessary for gel formation, and if a reducing agent is used, Even if used in combination, there is a problem that trivalent chromium reductively adsorbed is oxidized under the influence of excess alkali and oxygen and re-eluted as hexavalent chromium via water in the long term.
【０００５】上記の方法は、還元性ガス雰囲気中、あ
るいは還元性ガス発生物質と、可溶性六価クロム含有物
を共存させ、８００℃程度の高温度で焼成処理すること
により、可溶性六価クロムを安定な酸化クロム（III）
とし、可溶性重金属等の一部も酸化物とする方法であ
る。この方法は、可溶性六価クロムの還元不溶化におい
て安定した結果が得られるが、エネルギーを多量に消費
する方法であり、また、加熱中に重金属の飛散があるた
め、排ガス処理も高度の設備と技術を必要とし、現実的
には採用が困難な手法である。In the above-mentioned method, soluble hexavalent chromium is reduced by baking at a high temperature of about 800 ° C. in a reducing gas atmosphere or in the presence of a reducing gas generating substance and a substance containing soluble hexavalent chromium. Stable chromium (III) oxide
And a method in which a portion of soluble heavy metals and the like are also converted to oxides. This method provides stable results in the reduction and insolubilization of soluble hexavalent chromium, but is a method that consumes a large amount of energy, and because of the scattering of heavy metals during heating, exhaust gas treatment requires advanced equipment and technology. This is a technique that is difficult to adopt in practice.
【０００６】上記の方法は、塊状物に対しては表面か
ら還元されるが、内部までは還元が進みにくい。また、
コンクリート塊等構築物廃材の場合は、還元された三価
クロムが再び構築物廃材のアルカリ性下で、酸素酸化さ
れて六価クロムに戻ってしまうという問題がある。中和
剤溶液の散布が不均一となった場合は中和が過不足とな
り、過剰部では、六価クロムが再溶出し、不足部では重
金属等の不溶化が不十分となる。[0006] In the above method, the lump is reduced from the surface to the lump, but the reduction hardly proceeds to the inside. Also,
In the case of construction waste such as concrete lump, there is a problem that the reduced trivalent chromium is again oxidized by oxygen under the alkalinity of the construction waste and returns to hexavalent chromium. If the application of the neutralizing agent solution becomes non-uniform, the neutralization becomes excessive or insufficient. In the excessive part, hexavalent chromium is re-eluted, and in the insufficient part, the insolubilization of heavy metals and the like becomes insufficient.
【０００７】以上のように、現在、可溶性六価クロムを
含有する構築物廃材の不溶化処理において、工業的に有
利な無害化処理方法は提供されていない。As described above, at present, no industrially advantageous detoxification method has been provided for the insolubilization of construction waste materials containing soluble hexavalent chromium.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、上記従来の
実状に鑑みてなされたものであって、本発明が解決しよ
うとする課題は、可溶性六価クロムを含有する構築物廃
材を容易に低コストで効率的に無害化する処理方法を提
供するものである。DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to reduce the amount of waste materials from building materials containing soluble hexavalent chromium. It is an object of the present invention to provide a processing method for detoxifying efficiently at low cost.
【０００９】また、本発明が解決しようとする他の課題
は、可溶性六価クロムを含有する構築物廃材と可溶性六
価クロムを含有する土壌または産業廃棄物を同時に容易
に低コストで効率的に無害化する処理方法を提供するも
のである。Another problem to be solved by the present invention is that a constructional waste material containing soluble hexavalent chromium and a soil or industrial waste containing soluble hexavalent chromium can be easily and simultaneously toxic at low cost and efficiently. It is intended to provide a processing method for making the processing.
【００１０】[0010]
【課題を解決するための手段】本発明の可溶性六価クロ
ムを含有する構築物廃材を無害化処理する方法は、該構
築物廃材を微細化し、これを単独で処理する場合は、六
価クロムを還元する必要量の硫酸鉄(II)と適量の水を添
加し混合する。また、該構築物廃材を微細化したものを
他の同様の汚染土壌または産業廃棄物と同時に処理する
場合は、該土壌または産業廃棄物に、六価クロムを還元
する必要量の硫酸鉄(II)および適量の水を添加し、これ
に該構築物廃材を微細化したものを添加混合することで
六価クロムを三価クロムに還元し、同時に還元生成した
三価クロムおよび重金属等を水酸化物および水酸化物共
沈体等として不溶化する事を特徴とする。According to the method of the present invention for detoxifying a waste construction material containing soluble hexavalent chromium, the construction waste material is finely divided, and when treated alone, the hexavalent chromium is reduced. The required amount of iron (II) sulfate and an appropriate amount of water are added and mixed. Further, in the case where the refined construction waste is treated simultaneously with other similar contaminated soil or industrial waste, the soil or industrial waste is treated with a necessary amount of iron (II) sulfate to reduce hexavalent chromium. And an appropriate amount of water, and reducing and adding hexavalent chromium to trivalent chromium by adding and mixing a finer version of the construction waste material to the trivalent chromium and heavy metals, etc. It is characterized by being insolubilized as a hydroxide coprecipitate or the like.
【００１１】[0011]
【発明の実施の形態】以下に本発明を詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
【００１２】本発明において、無害化処理の対象となる
構築物廃材とは、セメントを主原料とするコンクリー
ト、モルタルまたはスレート等からなる構築物廃材であ
り、可溶性六価クロムを含有するものである。In the present invention, the construction waste material to be detoxified is a construction waste material made of concrete, mortar, slate, or the like using cement as a main material, and contains soluble hexavalent chromium.
【００１３】本発明において、無害化処理の対象となる
土壌または産業廃棄物とは、可溶性六価クロムを含有す
るものである。In the present invention, the soil or industrial waste to be detoxified contains soluble hexavalent chromium.
【００１４】本発明において、構築物廃材、土壌または
産業廃棄物には、可溶性六価クロムの他に、可溶性重金
属が含まれていてもよい。そのような可溶性重金属とし
ては、例えば、クロム（III）、水銀、鉛、カドミウ
ム、銅、亜鉛、マンガンおよび砒素等から選ばれる少な
くとも一種を挙げることができる。本発明方法により、
該可溶性重金属も同時に無害化処理をすることができ
る。In the present invention, the construction waste material, soil or industrial waste may contain soluble heavy metals in addition to soluble hexavalent chromium. Examples of such soluble heavy metals include at least one selected from chromium (III), mercury, lead, cadmium, copper, zinc, manganese, arsenic, and the like. According to the method of the present invention,
The soluble heavy metals can also be detoxified at the same time.
【００１５】本発明において、土壌または産業廃棄物を
同時に処理する場合は、あらかじめ該土壌または産業廃
棄物を必要に応じて分級処理する。例えば、土壌に含ま
れる可溶性六価クロム化合物が含浸している場合、分級
処理をして、必要な粒度以下に粉砕処理をした方が効率
的である。なお、粉砕処理対象物は構築物廃材と同様に
処理することができる。In the present invention, when simultaneously treating soil or industrial waste, the soil or industrial waste is classified beforehand if necessary. For example, when a soluble hexavalent chromium compound contained in soil is impregnated, it is more efficient to perform a classification treatment and pulverize to a required particle size or less. The object to be pulverized can be processed in the same manner as the construction waste material.
【００１６】コンクリート等の構築物廃材は、まず粉砕
処理する。例えば、後の添加混合時間を常温（約２０
℃）で１時間に設定する場合は、１ｍｍ以下に粉砕し、
同様に３時間に設定する場合は、３ｍｍ以下に粉砕す
る。但し、この関係は、該構築物廃材の履歴による影響
で一律とはならない点は配慮しなければならない。粉砕
手段は特に限定されないが、例えば一段目でジョークラ
ッシャーを用いて粉砕し、二段目でロッドミルを用いて
粉砕する方法や、ボールミルを用いて粉砕する方法等を
挙げることができる。なお、粉塵発生等を避けるため
に、水を用いて湿式で粉砕し、スラリー状としても問題
はない。普通ポルトランドセメントを原料とする該構築
物廃材を上記のようにスラリー状に粉砕した物は、通常
アルカリ性を示す。Building waste such as concrete is first pulverized. For example, the subsequent addition and mixing time is set to room temperature (about 20
° C) for 1 hour, pulverize to 1 mm or less,
Similarly, when the time is set to 3 hours, the powder is crushed to 3 mm or less. However, care must be taken that this relationship is not uniform due to the influence of the history of the construction waste material. The pulverizing means is not particularly limited. For example, a pulverization method using a jaw crusher at the first stage and a rod mill at the second stage, and a pulverization method using a ball mill can be used. In addition, in order to avoid dust generation, etc., there is no problem even if it is wet-pulverized using water to form a slurry. A material obtained by pulverizing the waste construction material from ordinary Portland cement into a slurry as described above usually shows alkalinity.
【００１７】上記粉砕処理した可溶性六価クロム等を含
有する構築物廃材を単独で処理する場合は以下の手順で
無害化処理する。In the case where the above-mentioned pulverized waste construction material containing soluble hexavalent chromium or the like is to be treated alone, it is rendered harmless by the following procedure.
【００１８】粉砕処理した構築物廃材に可溶性六価クロ
ムを溶出させるに必要な水の存在下、六価クロムを還元
する必要量の硫酸鉄(II)を添加し混合する。[0018] In the presence of water necessary to elute soluble hexavalent chromium into the pulverized construction waste material, a necessary amount of iron (II) sulfate for reducing hexavalent chromium is added and mixed.
【００１９】可溶性六価クロムを溶出させるのに必要な
水は、粉末化した構築物廃材に加えてスラリーとしても
よいし、構築物廃材を粉砕処理する際に加えて湿式粉砕
してスラリーとしてもよい。The water required to elute the soluble hexavalent chromium may be added to the powdered construction waste material to form a slurry, or may be added to the pulverization treatment of the construction waste material and wet-milled to form a slurry.
【００２０】必要量の硫酸鉄(II)とは、構築物廃材中に
含有される六価クロムを完全に還元するに足る量を示す
が、反応スラリー液のｐＨが１０．０を上回る場合はｐ
Ｈを８．０以上１０．０以下となるように硫酸鉄(II)を
追加し、所定の時間混合反応させる。なお、不溶化対象
成分にマンガンが含まれない場合は、反応スラリー液の
ｐＨを６．０以上１０．０以下とする。The required amount of iron (II) sulfate indicates an amount sufficient to completely reduce hexavalent chromium contained in the waste material of the building, but when the pH of the reaction slurry exceeds 10.0, p
Iron (II) sulfate is added so that H becomes 8.0 or more and 10.0 or less, and a mixing reaction is performed for a predetermined time. In addition, when manganese is not included in the component to be insolubilized, the pH of the reaction slurry liquid is set to 6.0 or more and 10.0 or less.
【００２１】混合中に、六価クロムの抽出、還元反応、
還元生成された三価クロムの水酸化物生成不溶化反応、
その他重金属等を含む場合はそれらの水酸化物生成不溶
化反応、コンクリートの溶解反応、そしてコンクリート
溶解で生じたカルシウムイオンと硫酸鉄(II)の反応によ
る硫酸カルシウムの生成反応等が起こる。これらの反応
により、コンクリート中に含有されていた可溶性六価ク
ロムは三価クロムに還元され、同時に還元生成した三価
クロムを水酸化クロムに、同様に共存する重金属等を水
酸化物と水酸化物共沈体等にして不溶化し、これを硫酸
カルシウムと共存固定化することとなる。During the mixing, extraction of hexavalent chromium, reduction reaction,
Hydroxide-generated insolubilization reaction of reduced trivalent chromium,
In addition, when heavy metals and the like are contained, a hydroxide production insolubilization reaction, a concrete dissolution reaction, and a calcium sulfate generation reaction due to a reaction between calcium ions generated by concrete dissolution and iron (II) sulfate occur. By these reactions, the soluble hexavalent chromium contained in the concrete is reduced to trivalent chromium, and at the same time, the reduced trivalent chromium is reduced to chromium hydroxide, and the coexisting heavy metals and the like are converted to hydroxide and hydroxide. It is insolubilized in the form of a coprecipitate or the like, and this is co-fixed with calcium sulfate.
【００２２】上記粉砕処理によって得られた可溶性六価
クロム等を含有する構築物廃材を該土壌または産業廃棄
物と同時に処理する場合は以下の手順で処理する。When the waste construction material containing soluble hexavalent chromium and the like obtained by the above-mentioned pulverization treatment is treated simultaneously with the soil or industrial waste, the treatment is carried out in the following procedure.
【００２３】該土壌または産業廃棄物に六価クロムを還
元する必要量の硫酸鉄(II)と、可溶性六価クロムを溶出
させるに必要な水を添加し混合する。必要量の硫酸鉄(I
I)とは、該土壌または産業廃棄物と後に添加混合する構
築物廃材中に含有される六価クロムを完全に還元するに
足る量を示す。これに該構築物廃材を微細化した粉末ま
たは乳をスラリーのｐＨを観察しながら添加混合し、反
応スラリー液のｐＨが８．０以上１０．０以下となるよ
うにすることで、該土壌または産業廃棄物と該構築物廃
材を同時に無害化することができる。なお、不溶化対象
成分にマンガンを含まない場合は、反応スラリー液のｐ
Ｈを６．０以上１０．０以下とする。The soil or industrial waste is mixed with a necessary amount of iron (II) sulfate for reducing hexavalent chromium and water necessary for eluting soluble hexavalent chromium. The required amount of iron sulfate (I
I) indicates an amount sufficient to completely reduce hexavalent chromium contained in the construction waste material to be added and mixed with the soil or industrial waste later. Powder or milk obtained by refining the construction waste material is added to and mixed with the slurry while observing the pH of the slurry, and the pH of the reaction slurry is adjusted to 8.0 or more and 10.0 or less, whereby the soil or industrial The waste and the construction waste can be simultaneously rendered harmless. When manganese is not contained in the component to be insolubilized, p of the reaction slurry
H is set to 6.0 or more and 10.0 or less.
【００２４】本発明において、還元作用を持つ硫酸鉄(I
I)としては、例えば硫酸鉄(II)七水和物、硫酸鉄(II)四
水和物、硫酸鉄(II)五水和物等が挙げられる。In the present invention, iron sulfate (I
Examples of (I) include iron (II) sulfate heptahydrate, iron (II) sulfate tetrahydrate, and iron (II) sulfate pentahydrate.
【００２５】本発明において、反応の溶媒となる水の添
加量については、特に限定しないが、実用上は、抽出、
溶解、反応を効率的に行うためには、重量比で５％以上
とするのが好ましい。また、処理後に運搬し安い性状と
するためには、重量比で５０％以下とするのが好まし
い。水の添加時期については、初期から添加するのが反
応上好ましいが、土壌または産業廃棄物と同時に処理す
る場合は全てを混合後に添加してもよい。あるいは構築
物廃材を湿式粉砕した場合は湿式粉砕の水分でまかなう
ことも可能で特に限定するものではない。同様に処理対
象物と薬剤の混合機への仕込手順も特に限定する物では
ない。処理後泥状のものを３日間ほど室温大気雰囲気下
で放置することで硫酸カルシウムの生成により僅かに固
化が進むが、直ちに固化運搬する場合には、市販の吸水
性固化剤あるいはベントナイト等を適量添加混合するの
が好ましい。In the present invention, the amount of water used as a reaction solvent is not particularly limited.
For efficient dissolution and reaction, the weight ratio is preferably 5% or more. In addition, in order to reduce the cost of transportation after the treatment, the weight ratio is preferably 50% or less. Regarding the timing of adding water, it is preferable in terms of reaction to add it from the beginning, but when treating simultaneously with soil or industrial waste, all may be added after mixing. Alternatively, when the construction waste material is wet-pulverized, the waste material can be covered with the moisture of the wet pulverization, and is not particularly limited. Similarly, the procedure for charging the processing object and the chemical into the mixer is not particularly limited. After the treatment, the mud is allowed to stand for 3 days at room temperature in the atmosphere, and the solidification proceeds slightly due to the formation of calcium sulfate. It is preferable to add and mix.
【００２６】このようにして可溶性六価クロムを含有す
る構築物廃材を不溶化処理することができる。In this way, the waste construction material containing soluble hexavalent chromium can be insolubilized.
【００２７】[0027]
【実施例】以下に実施例を示し、本発明を更に具体的に
説明するが、本発明はこれにより制限を受けるものでは
ない。The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention.
【００２８】実施例１ 一時間当たり、可溶性六価クロム含有コンクリート塊を
２ｔと水１ｍ3を同時に鉄製の内容積１０ｍ3で内部に直
径１０ｃｍの鉄球１０ｔを含むチューブミルに供給し微
粉砕して、コンクリート粉のスラリー乳液（スラリー濃
度約６７ｗ／ｗ％）を得た。得られたスラリーの粒度分
布は、表１に示す通りで平均粒径が約０．２ｍｍであっ
た。Example 1 An hourly amount of soluble hexavalent chromium-containing concrete ingot, 2 t and 1 m 3 of water, were simultaneously supplied to a tube mill having an inner volume of 10 m 3 made of iron and containing 10 t of iron balls with a diameter of 10 cm and finely pulverized. Thus, a slurry emulsion of concrete powder (slurry concentration: about 67 w / w%) was obtained. The particle size distribution of the obtained slurry was as shown in Table 1, and the average particle size was about 0.2 mm.
【００２９】[0029]
【表１】 [Table 1]
【００３０】このスラリー液１ｍ3に対して硫酸鉄(II)
７水塩２００ｋｇを添加後１時間混合し、養生バットに
約１０ｃｍ高さで排出した。スラリーのｐＨは約７とな
った。また、スラリー液１ｍ3に対して硫酸鉄(II)７水
塩２００ｋｇを添加後１時間混合し、さらに吸水固化剤
（オルガノ株式会社製、「ＲＣ−１（Ｔ）」）を０．５
％添加し混合した。これらを室温大気雰囲気下で放置
し、分析した結果は表２の通りで、六価クロムは検出さ
れなかった。The iron (II) sulfate was added to 1 m 3 of the slurry.
After adding 200 kg of heptahydrate, the mixture was mixed for 1 hour and discharged into a curing vat at a height of about 10 cm. The pH of the slurry was about 7. Further, 200 kg of iron (II) sulfate heptahydrate was added to 1 m 3 of the slurry and mixed for 1 hour, and 0.5 mL of a water absorbing and solidifying agent (“RC-1 (T)” manufactured by Organo Corporation) was added.
% And mixed. These were allowed to stand in an air atmosphere at room temperature, and the results of analysis are as shown in Table 2. No hexavalent chromium was detected.
【００３１】[0031]
【表２】 [Table 2]
【００３２】注；＊固形分での分析の検液作製は、環境
庁告示第１０号「産業廃棄物に含まれる金属等の検定方
法」に準じ検液を作製し、その検液中の六価クロムを
「ＪＩＳＫ０１０２の６５．２」に掲げる方法により定
量した。Note: * For the preparation of a test solution for analysis using solids, a test solution was prepared in accordance with the Notification of the Environment Agency, No. 10, "Testing Methods for Metals and the Like Included in Industrial Waste", and six samples in the test solution were prepared. Chromium (VI) was quantified by the method described in "JIS K0102 65.2".
【００３３】実施例２ 可溶性六価クロム、マンガンを含有する土壌５ｔに硫酸
鉄（II）７水塩２５０ｋｇ、スラリー濃度約６７ｗ／ｗ
％のコンクリート廃材のスラリー液（実施例１で調製し
たもの）１．７ｍ3を加え３時間混合して、泥状となっ
た処理物を高さ約３０ｃｍの養生マスで３日間自然放置
し養生した。この混合および養生中に硫酸カルシウムが
該処理物中に生成して、柔らかい無害な処理物が得られ
た。この処理前後の分析値を表３に示す。Example 2 250 kg of ferrous sulfate (II) heptahydrate was added to 5 t of soil containing soluble hexavalent chromium and manganese at a slurry concentration of about 67 w / w.
% Of concrete waste slurry (prepared in Example 1) (1.7 m 3 ) was added and mixed for 3 hours, and the mud-like treated material was naturally left in a curing mass of about 30 cm in height for 3 days to cure. did. During this mixing and curing, calcium sulfate was formed in the treated product, and a soft and harmless treated product was obtained. Table 3 shows the analysis values before and after this processing.
【００３４】[0034]
【表３】 [Table 3]
【００３５】注；＊固形分での分析の検液作製は、環境
庁告示第１０号「産業廃棄物に含まれる金属等の検定方
法」に準じ検液を作製し、その検液中の六価クロムを
「ＪＩＳＫ０１０２の６５．２」に掲げる方法により定
量して実施した。同じくその検液中のマンガンを「ＪＩ
Ｓ Ｋ０１０２の５６．４」に掲げる方法により定量し
た。Note: * For the preparation of a test solution for analysis with solid content, prepare a test solution according to the Notification of the Environment Agency No. 10 “Testing method for metals and the like contained in industrial waste”, and prepare 6 Chromium (VI) was quantified by the method described in "JIS K0102 65.2". Similarly, manganese in the test solution was replaced by "JI
SK0102 56.4 ".
【００３６】この処理品を室温で大気中に保存し１カ月
間に追跡調査した分析値は表４に示すとおりであり、１
カ月経過しても六価クロムの溶出は認められず安定な状
態となっていることを確認した。The analysis results of this treated product stored in the air at room temperature and followed up for one month are shown in Table 4.
Elution of hexavalent chromium was not observed even after a lapse of months, and it was confirmed that the state was stable.
【００３７】[0037]
【表４】 [Table 4]
【００３８】[0038]
【発明の効果】請求項１に記載した本発明により、容易
に低コストで効率的に可溶性六価クロムの溶出を防止
し、可溶性六価クロムを含有する構築物廃材を無害化処
理することができる。According to the first aspect of the present invention, the soluble hexavalent chromium can be easily and efficiently prevented from being eluted at low cost, and the construction waste containing soluble hexavalent chromium can be detoxified. .
【００３９】請求項２に記載した本発明により、容易に
低コストで効率的に可溶性六価クロムを含有する土壌ま
たは産業廃棄物および構築物廃材を同時に無害化処理す
ることができる。According to the second aspect of the present invention, soil or industrial waste and construction waste containing soluble hexavalent chromium can be easily and simultaneously detoxified at low cost and efficiently.
Claims (5)
を微細化し、可溶性六価クロムを溶出させる水の存在
下、硫酸鉄(II)を添加することを特徴とする可溶性六価
クロムを含有する構築物廃材の無害化処理方法。Claims 1. A soluble hexavalent chromium-containing chromium-containing chromium-containing chromium-containing chromium-containing chromium-containing chromium-containing chromium-containing chromium-containing chromium-containing chromium-containing chromium-containing chromium oxide. Detoxification method of construction waste.
産業廃棄物に六価クロムを溶出させる水の存在下、硫酸
鉄(II)を添加し、可溶性六価クロムを含有する構築物廃
材を微細化したものを添加することを特徴とする可溶性
六価クロムを含有する土壌または産業廃棄物および構築
物廃材の無害化処理方法。2. Ferrous sulfate (II) is added to soil or industrial waste containing soluble hexavalent chromium in the presence of water to elute hexavalent chromium, and the construction waste containing soluble hexavalent chromium is refined. A method for detoxifying soil or industrial wastes and construction wastes containing soluble hexavalent chromium, characterized in that the wastes are added.
コンクリート、モルタルまたはスレート等からなる構築
物廃材であることを特徴とする請求項１または２に記載
の無害化処理方法。3. The detoxification method according to claim 1, wherein the construction waste material is a construction waste material made of concrete, mortar, slate, or the like using cement as a main raw material.
らに可溶性重金属が含まれていることを特徴とする請求
項１ないし３のいずれか１項に記載の無害化処理方法。4. The detoxification method according to claim 1, wherein a soluble heavy metal is further contained in the soil, industrial waste or construction waste material.
銀、鉛、カドミウム、銅、亜鉛、マンガンおよび砒素か
ら選ばれる少なくとも１種であることを特徴とする請求
項４に記載の無害化処理方法。5. The method of claim 4, wherein the soluble heavy metal is at least one selected from chromium (III), mercury, lead, cadmium, copper, zinc, manganese and arsenic. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30674999A JP2001121109A (en) | 1999-10-28 | 1999-10-28 | Detoxicating method for construction waste containing soluble 6-valent chromium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30674999A JP2001121109A (en) | 1999-10-28 | 1999-10-28 | Detoxicating method for construction waste containing soluble 6-valent chromium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001121109A true JP2001121109A (en) | 2001-05-08 |
Family
ID=17960860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30674999A Pending JP2001121109A (en) | 1999-10-28 | 1999-10-28 | Detoxicating method for construction waste containing soluble 6-valent chromium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001121109A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005240313A (en) * | 2004-02-24 | 2005-09-08 | Jfe Steel Kk | Method of using concrete waste as roadbed material, and the roadbed material |
| JP2007014881A (en) * | 2005-07-07 | 2007-01-25 | Kajima Corp | Recycling method of concrete mass |
| JP2007268431A (en) * | 2006-03-31 | 2007-10-18 | Shimizu Corp | Concrete reproduction material |
| JP2010214216A (en) * | 2009-03-13 | 2010-09-30 | Kajima Road Co Ltd | Insolubilization method of hexavalent chromium |
| CN104624610A (en) * | 2015-01-22 | 2015-05-20 | 叶澄 | Detergent for chromium contaminated construction waste |
| CN109261700A (en) * | 2018-11-05 | 2019-01-25 | 北京建工环境修复股份有限公司 | A kind of immersion systems and method of citric acid treatment building waste |
-
1999
- 1999-10-28 JP JP30674999A patent/JP2001121109A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005240313A (en) * | 2004-02-24 | 2005-09-08 | Jfe Steel Kk | Method of using concrete waste as roadbed material, and the roadbed material |
| JP2007014881A (en) * | 2005-07-07 | 2007-01-25 | Kajima Corp | Recycling method of concrete mass |
| JP2007268431A (en) * | 2006-03-31 | 2007-10-18 | Shimizu Corp | Concrete reproduction material |
| JP2010214216A (en) * | 2009-03-13 | 2010-09-30 | Kajima Road Co Ltd | Insolubilization method of hexavalent chromium |
| CN104624610A (en) * | 2015-01-22 | 2015-05-20 | 叶澄 | Detergent for chromium contaminated construction waste |
| CN109261700A (en) * | 2018-11-05 | 2019-01-25 | 北京建工环境修复股份有限公司 | A kind of immersion systems and method of citric acid treatment building waste |
| CN109261700B (en) * | 2018-11-05 | 2023-08-22 | 北京建工环境修复股份有限公司 | Pickling system and method for treating construction waste by citric acid |
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