JP3213054B2 - Treatment method for incinerated ash containing heavy metals - Google Patents
Treatment method for incinerated ash containing heavy metalsInfo
- Publication number
- JP3213054B2 JP3213054B2 JP14212692A JP14212692A JP3213054B2 JP 3213054 B2 JP3213054 B2 JP 3213054B2 JP 14212692 A JP14212692 A JP 14212692A JP 14212692 A JP14212692 A JP 14212692A JP 3213054 B2 JP3213054 B2 JP 3213054B2
- Authority
- JP
- Japan
- Prior art keywords
- heavy metals
- fly ash
- ash
- cement
- heavy metal
- 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.)
- Expired - Lifetime
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
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Processing Of Solid Wastes (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、都市ごみ焼却工場や産
業廃棄物焼却工場等から発生する重金属含有焼却灰（飛
灰を含む）の処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating heavy metal-containing incineration ash (including fly ash) generated from a municipal waste incineration plant, an industrial waste incineration plant, or the like.
【０００２】[0002]
【従来の技術】従来より、都市ごみ焼却工場や産業廃棄
物焼却工場から発生する焼却灰あるいは飛灰は、最終処
分場にそのまま埋め立てたり、セメント等の固化剤を10
〜20％混合して固化したものや、固化したものを造粒機
で造粒した造粒物を最終処分場に埋め立てるなどの方法
（セメント固化法）で処理されており、特に重金属類を
含む焼却灰や飛灰を処理する場合には、一般にセメント
固化法が用いられていた。これは、セメントは一般的に
強アルカリによって重金属を含む金属イオンを溶解度の
小さい水酸化物にして溶出を抑制する効果を有するため
である。2. Description of the Related Art Conventionally, incineration ash or fly ash generated from municipal solid waste incineration plants or industrial waste incineration plants has been landfilled at final disposal sites, or a solidifying agent such as cement has been used.
~ 20% mixed and solidified, or solidified and granulated with a granulator and granulated at a final disposal site (cement solidification method) When treating incinerated ash and fly ash, a cement solidification method was generally used. This is because the cement generally has an effect of suppressing the dissolution of metal ions containing heavy metals into hydroxides having low solubility by strong alkali.
【０００３】しかしながら、上記従来の重金属含有焼却
灰の処理方法によると、亜鉛、クロム、鉛などの有害な
重金属が溶出して環境に悪影響を及ぼしてしまうことが
あった。これは、上記焼却灰や飛灰の中にはアルカリ性
を示すものが多く、特に飛灰は、排ガス処理の際に使用
される未反応の消石灰が多く残存しているため、強いア
ルカリ性を示す上、これら焼却灰や飛灰を処理する際に
固化剤としてセメントを加えると、セメントが硬化する
際にＣａ（ＯＨ）2 が生成されるため、さらに強いアル
カリ性となることに起因している。However, according to the above-mentioned conventional method for treating heavy metal-containing incineration ash, harmful heavy metals such as zinc, chromium, and lead may be eluted, which may adversely affect the environment. This is because most of the incinerated ash and fly ash show alkalinity, and especially fly ash shows strong alkalinity because a large amount of unreacted slaked lime used during exhaust gas treatment remains. When cement is added as a solidifying agent when treating these incinerated ash and fly ash, Ca (OH) 2 is generated when the cement hardens, and therefore, the alkali becomes more alkaline.
【０００４】すなわち、焼却灰や飛灰中に含まれる亜鉛
やクロムなどは、強アルカリ領域において再溶解しやす
く、鉛は強アルカリ領域では溶出しやすい亜鉛酸イオン
（ＨＰｂＯ- ）の形で存在するため、上記従来の処理方
法で処理された強アルカリ領域にある焼却灰や飛灰の処
理物に含まれている亜鉛、クロム、鉛などは、極めて溶
出しやすくなるのである。That is, zinc and chromium contained in incineration ash and fly ash are easily redissolved in a strong alkali region, and lead is present in the form of zincate ion (HPbO − ) which is easily eluted in a strong alkali region. Therefore, zinc, chromium, lead, and the like contained in the incinerated ash and fly ash treated in the strong alkaline region treated by the above-mentioned conventional treatment method are extremely easily eluted.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上述従来の
技術の問題点を解決し、ｐＨ11以上の強アルカリ領域で
溶出する有害な重金属の溶出量を、簡易な手段で環境基
準以下に押さえることのできる重金属含有焼却灰の処理
方法を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and reduces the amount of harmful heavy metals eluted in a strongly alkaline region of pH 11 or more to below environmental standards by simple means. It is an object of the present invention to provide a method for treating heavy metal-containing incinerated ash that can be used.
【０００６】[0006]
【課題を解決するための手段】本発明者等は、上記目的
を達成するために鋭意研究した結果、焼却灰に含まれて
いる強アルカリ領域で溶出しやすい重金属を、硫酸と反
応させることによって安定化させた後、固化剤を加えて
固化させることにより、上記課題を解決することができ
ることを見い出し、本発明に到達した。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, have been found to react heavy metals contained in incinerated ash, which are easily eluted in a strongly alkaline region, with sulfuric acid. After stabilization, it has been found that the above-mentioned problems can be solved by adding a solidifying agent to solidify, and the present invention has been achieved.
【０００７】 すなわち、本発明は、都市ごみ焼却工場
や廃棄物焼却工場から発生し、ｐＨ１１以上において溶
出する重金属を含有するアルカリ性の重金属含有焼却灰
の処理方法であって、上記重金属含有焼却灰に硫酸を添
加し、焼却灰に含まれている重金属と硫酸とを反応させ
て安定化させた後、この安定化された焼却灰にセメント
を添加してアルカリ性にするとともに固化させることを
特徴とする重金属含有焼却灰の処理方法を提供するもの
である。That is, the present invention relates to a method for treating alkaline heavy metal-containing incinerated ash generated from a municipal solid waste incineration plant or a waste incineration plant and eluted at a pH of 11 or more and containing heavy metal. After adding sulfuric acid and stabilizing the heavy metal contained in the incinerated ash by reacting it with sulfuric acid, cement is added to the stabilized incinerated ash to make it alkaline and solidify. It is intended to provide a method for treating incinerated ash containing heavy metals.
【０００８】[0008]
【作用】本発明法について、都市ごみ焼却工場から発生
する重金属を含んだ飛灰の処理方法を例にあげて説明す
る。まず、水を張ったコンクリート製ピットに上記飛灰
を投入し、飛灰を湿らせる。次いで、該ピットに飛灰１
ｔ当り 200kgの割合で硫酸を添加し、飛灰に硫酸が均一
にいきわたるように、バックフォーでよく混練する。The method of the present invention will be described by taking as an example a method of treating fly ash containing heavy metals generated from a municipal solid waste incineration plant. First, the fly ash is put into a water-filled concrete pit to wet the fly ash. Next, fly ash 1
Sulfuric acid is added at a rate of 200 kg per t, and the mixture is thoroughly kneaded with a back fountain so that the sulfuric acid is evenly distributed in the fly ash.
【０００９】飛灰に含まれる重金属が硫酸と反応して安
定化した後（約１時間程度）、ここに飛灰の10％に相当
する量のセメントを固化剤として添加し、セメントが均
一にいきわたるようにバックフォーでよく混練する。混
練後、これを養生ヤードに移し、１日間養生した後、得
られた処理物を最終処分場に埋め立てる。なお、上記固
化の際に用いられるセメントとしては、ポルトランドセ
メント、アルミナセメント、高炉セメント等があるが、
中でも水和による発熱が少なく腐食しにくい高炉セメン
トが好ましい。After the heavy metals contained in the fly ash have been stabilized by the reaction with sulfuric acid (about 1 hour), an amount of cement equivalent to 10% of the fly ash is added as a solidifying agent to make the cement uniform. Knead well with back fork. After kneading, the mixture is transferred to a curing yard and cured for one day, and the obtained treated material is buried in a final disposal site. In addition, as the cement used at the time of the solidification, there are Portland cement, alumina cement, blast furnace cement, etc.
Above all, blast furnace cement that generates less heat due to hydration and hardly corrodes is preferable.
【００１０】また、上記セメントで固化した処理物（環
境庁の定める溶出試験法13号に基づいた試験における定
められた成分の溶出値が基準値以下に納まっているも
の）は、これと特に反応を起こすもの（酸性物質など）
と隣接して埋め立てない限り、時間の経過と共に固化反
応が進行してより強固なものとなるため、鉛などの重金
属の溶出がいっそう起こりにくくなる。The treated product solidified with the above cement (the one in which the dissolution value of the specified component in the test based on the dissolution test method 13 specified by the Environment Agency falls below the reference value) is particularly reactive with this. (Such as acidic substances)
Unless landfill is performed next to the solidification, the solidification reaction progresses with time and becomes stronger, so that the elution of heavy metals such as lead hardly occurs.
【００１１】以下、実施例により本発明をさらに詳細に
説明する。しかし本発明の範囲は以下の実施例により制
限されるものではない。Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the following examples.
【００１２】[0012]
【実施例】本発明法の一実施例を以下に示す。An embodiment of the method of the present invention will be described below.
【００１３】まず、Ａ都市ごみ焼却場から発生する表１
に示す化学組成からなる飛灰１ｔを、水を張ったコンク
リート製ピットに投入して湿らせた。次いで、該ピット
内に250kgの硫酸を添加し、飛灰に硫酸が均一にいきわ
たるようにバックフォーでよく混練し、飛灰に含まれる
重金属と硫酸とを反応させた。反応後（約１時間後）、
飛灰の10％に相当する量の高炉セメントを固化剤として
添加し、セメントが均一にいきわたるようにバックフォ
ーでよく混練し、養生ヤードに移して３日間養生した。
養生後、得られた処理物を最終処分場に埋め立てた。First, Table 1 generated from the A city refuse incineration plant
1t of fly ash having the chemical composition shown in (1) was poured into a concrete pit filled with water and wetted. Next, 250 kg of sulfuric acid was added into the pit, and the fly ash was kneaded well with a back fore so that the sulfuric acid was uniformly distributed, and the heavy metal contained in the fly ash was reacted with sulfuric acid. After the reaction (after about 1 hour),
Blast furnace cement in an amount equivalent to 10% of the fly ash was added as a solidifying agent, kneaded well with a back forging so that the cement was evenly distributed, transferred to a curing yard and cured for 3 days.
After curing, the obtained treated material was buried in a final disposal site.
【００１４】[0014]
【表１】 [Table 1]
【００１５】上記のようにして最終処分場に埋め立てた
処理物について、その一部を採取し、環境庁で定める溶
出試験法13号に従って溶出試験を行い、その結果を表２
に示した。なお、表３に、管理型最終処分場への埋め立
て基準について示した。[0015] A part of the treated material buried in the final disposal site as described above is sampled and subjected to a dissolution test in accordance with the Dissolution Test Method 13 specified by the Environment Agency.
It was shown to. In addition, Table 3 shows the landfill criteria for managed landfill sites.
【００１６】[0016]
【表２】 [Table 2]
【００１７】[0017]
【表３】 [Table 3]
【００１８】[0018]
【比較例１】表１に示す組成の飛灰を直接最終処分場に
埋め立て、その一部を採集したものについて実施例と同
様の試験を行い、その結果を表２に併記した。Comparative Example 1 Fly ash having the composition shown in Table 1 was directly buried in a final disposal site, and a part of the collected fly ash was subjected to the same test as in the example. The results are also shown in Table 2.
【００１９】[0019]
【比較例２】表１に示す組成の飛灰を、硫酸と反応させ
ないこと以外は実施例と同様にして最終処分場に埋め立
て、その一部を採集したものについて実施例と同様の試
験を行い、その結果を表２に併記した。Comparative Example 2 Fly ash having the composition shown in Table 1 was buried in a final disposal site in the same manner as in the example except that it did not react with sulfuric acid, and a part of the collected ash was subjected to the same test as in the example. Table 2 shows the results.
【００２０】表２および表３からもわかるように、比較
例１および２に示す従来の処理方法によると、比較例１
における鉛の溶出量は 125mg／ｌ、比較例２における鉛
の溶出量は26mg／ｌであり、いずれも鉛の溶出量が埋め
立て基準における鉛の溶出量の上限である 3mg／ｌより
もはるかに多かった。これに対し、本発明の処理方法に
よると、鉛を含むすべての重金属の溶出量が基準を満た
していた。As can be seen from Tables 2 and 3, according to the conventional processing methods shown in Comparative Examples 1 and 2, Comparative Example 1
The amount of lead eluted was 125 mg / l in Comparative Example 2, and the amount of lead eluted in Comparative Example 2 was 26 mg / l. In each case, the amount of lead eluted was far higher than the upper limit of 3 mg / l of the amount of lead eluted in the landfill standard. There were many. On the other hand, according to the treatment method of the present invention, the elution amount of all heavy metals including lead satisfied the standard.
【００２１】[0021]
【発明の効果】本発明法の開発により、ｐＨ11以上の強
アルカリ領域で溶出する鉛、亜鉛、クロム、カドミウム
等の重金属の溶出量を、簡易な手段で環境基準以下にお
さえることができるようになった。According to the development of the method of the present invention, the elution amount of heavy metals such as lead, zinc, chromium, cadmium and the like eluted in a strong alkali region having a pH of 11 or more can be kept below the environmental standard by a simple means. became.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−109984（ＪＰ，Ａ) 特開 昭61−101711（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B09B 3/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-109984 (JP, A) JP-A-61-101711 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B09B 3/00
Claims (1)
発生し、ｐＨ１１以上において溶出する重金属を含有す
るアルカリ性の重金属含有焼却灰の処理方法であって、
上記重金属含有焼却灰に硫酸を添加し、焼却灰に含まれ
ている重金属と硫酸とを反応させて安定化させた後、こ
の安定化された焼却灰にセメントを添加してアルカリ性
にするとともに固化させることを特徴とする重金属含有
焼却灰の処理方法。1. Heavy metals generated from municipal solid waste incineration plants and waste incineration plants and eluted at pH 11 or higher.
A method of treating alkaline heavy metal-containing incineration ash,
Sulfuric acid is added to the heavy metal-containing incineration ash, and the heavy metal contained in the incineration ash is allowed to react with sulfuric acid to stabilize.Then , cement is added to the stabilized incineration ash to add alkaline.
A method for treating heavy metal-containing incineration ash, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14212692A JP3213054B2 (en) | 1992-05-07 | 1992-05-07 | Treatment method for incinerated ash containing heavy metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14212692A JP3213054B2 (en) | 1992-05-07 | 1992-05-07 | Treatment method for incinerated ash containing heavy metals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05309356A JPH05309356A (en) | 1993-11-22 |
| JP3213054B2 true JP3213054B2 (en) | 2001-09-25 |
Family
ID=15307992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14212692A Expired - Lifetime JP3213054B2 (en) | 1992-05-07 | 1992-05-07 | Treatment method for incinerated ash containing heavy metals |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3213054B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3002957U (en) * | 1994-04-11 | 1994-10-11 | 鉄夫 深石 | Incineration ash solidification treatment plant |
| AT406743B (en) * | 1997-06-18 | 2000-08-25 | Reststoffverhaldungs Ges M B H | Process for immobilising heavy metals which are capable of elution from waste materials |
| JP3771689B2 (en) * | 1997-09-26 | 2006-04-26 | 三機工業株式会社 | Method for producing sewage sludge incinerated ash solidified product |
| CN103846267A (en) * | 2012-11-28 | 2014-06-11 | 大连东泰产业废弃物处理有限公司 | Method for processing fly ash from burning of garbage |
| JP2020000968A (en) * | 2018-06-26 | 2020-01-09 | 花王株式会社 | Method of treating combustion ash |
| CN110639935A (en) * | 2019-09-29 | 2020-01-03 | 新中天环保股份有限公司 | Waste incineration fly ash treatment method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS547778A (en) * | 1977-06-21 | 1979-01-20 | Seitetsu Kagaku Co Ltd | Method of stably treating flied ash in smoke of municipal refuse incinerator |
| JPS5787881A (en) * | 1980-11-21 | 1982-06-01 | Maeda Sekkei Kk | Treatment of incineration refuse |
| JPS5864173A (en) * | 1981-10-14 | 1983-04-16 | Kazuhisa Hoshino | Treatment for making noxious substance harmless |
| JPS61101711A (en) * | 1984-10-24 | 1986-05-20 | Hirochika Okuyama | Method for making incinerated ash harmless |
| JP3120430B2 (en) * | 1989-09-26 | 2000-12-25 | 不二サッシ株式会社 | Treatment method for highly alkaline dust ash |
-
1992
- 1992-05-07 JP JP14212692A patent/JP3213054B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05309356A (en) | 1993-11-22 |
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