JP2003275730A - Method for suppressing elution of harmful substance from sewage sludge incineration ash - Google Patents

Method for suppressing elution of harmful substance from sewage sludge incineration ash

Info

Publication number
JP2003275730A
JP2003275730A JP2002082057A JP2002082057A JP2003275730A JP 2003275730 A JP2003275730 A JP 2003275730A JP 2002082057 A JP2002082057 A JP 2002082057A JP 2002082057 A JP2002082057 A JP 2002082057A JP 2003275730 A JP2003275730 A JP 2003275730A
Authority
JP
Japan
Prior art keywords
sewage sludge
incineration ash
sludge incineration
elution
harmful substances
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
Application number
JP2002082057A
Other languages
Japanese (ja)
Inventor
Mikihiro Oida
幹弘 笈田
Noribumi Isu
紀文 井須
Hiroteru Maenami
洋輝 前浪
Hiroaki Kuno
裕明 久野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inax Corp
Japan Science and Technology Agency
Original Assignee
Inax Corp
Japan Science and Technology Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Inax Corp, Japan Science and Technology Corp filed Critical Inax Corp
Priority to JP2002082057A priority Critical patent/JP2003275730A/en
Publication of JP2003275730A publication Critical patent/JP2003275730A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for suppressing elution having a larger suppression effect on the elution of harmful substance. <P>SOLUTION: In the mixing process, a mixture for hydrothermal solidification made by mixing hydrated lime to sewage sludge incineration ash is prepared. In the forming process, the mixture for hydrothermal solidification is formed and a formed body is produced. The formed body is subjected to hydrothermal treatment, calcium silicate hydrate is produced and solidified and, as a result, hydrothermal solidificated material yielded as an apatite can be obtained. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は下水汚泥焼却灰から
の有害物質の溶出抑制方法に関する。
TECHNICAL FIELD The present invention relates to a method for suppressing elution of harmful substances from sewage sludge incineration ash.

【0002】[0002]

【従来の技術】近年、下水処理場や浄化槽から発生する
下水汚泥の処分が問題となっている。下水汚泥にはリン
や窒素等の栄養素や有機物が多量に含まれているため、
これをそのまま海に投棄したり、河川に放流したりすれ
ば、BOD値が上昇し、赤潮が発生する等、環境汚染を
引き起こすことになる。このため、下水汚泥は焼却処分
によって下水汚泥焼却灰とされた後、埋め立て処分がな
されることが多い。
2. Description of the Related Art In recent years, the disposal of sewage sludge generated from sewage treatment plants and septic tanks has become a problem. Since sewage sludge contains a large amount of nutrients and organic substances such as phosphorus and nitrogen,
If it is dumped into the sea as it is or discharged into a river, the BOD value will rise, causing red tides and other environmental pollution. For this reason, sewage sludge is often incinerated and disposed of after being turned into sewage sludge incineration ash.

【0003】しかし、下水汚泥焼却灰にはヒ素、セレニ
ウム等の有害物質も含まれ、それを埋め立て処分した場
合、それら有害物質が地中に溶出し、やはり環境汚染が
生じるおそれがある。
However, sewage sludge incineration ash also contains toxic substances such as arsenic and selenium, and when they are landfilled, these toxic substances may elute into the ground and may cause environmental pollution.

【0004】このため、下水汚泥焼却灰等の無機廃棄物
を用いて水熱処理により水熱固化体とし、下水汚泥焼却
灰からの有害物質の溶出を抑制する方法が提案されてい
る(特開平10−296205号公報)。
Therefore, a method has been proposed in which inorganic waste such as sewage sludge incineration ash is hydrothermally treated to form a hydrothermally solidified body, which suppresses the elution of harmful substances from the sewage sludge incineration ash (Japanese Patent Laid-Open No. HEI 10-1999). -296205).

【0005】この方法では、まず下水汚泥焼却灰に活性
カルシウム源と活性アルカリ源とを混合してなる水熱固
化用調合物を用意する。次に水熱固化用調合物を成形し
て成形体とする。さらに、成形体を水熱処理し、ケイ酸
カルシウム水和物を生じて固化しているとともにゼオラ
イト(zeolite)系鉱物を生じた水熱固化体を得る。
In this method, first, a hydrothermal solidification formulation prepared by mixing sewage sludge incineration ash with an active calcium source and an active alkali source is prepared. Next, the hydrothermal solidification formulation is molded into a molded body. Further, the molded body is subjected to hydrothermal treatment to obtain a hydrothermally solidified body in which calcium silicate hydrate is produced and solidified and a zeolite (zeolite) type mineral is produced.

【0006】上記方法によって得られる水熱固化体中に
は、有害物質を吸着するゼオライト系鉱物が生じている
ため、下水汚泥焼却灰からの有害物質の溶出を抑制する
ことができる。また、この方法は、水熱処理の温度が2
00°C以下という比較的低い温度であるため、下水汚
泥焼却灰からの有害物質の溶出抑制を少ないエネルギー
で実現できるというメリットもある。
In the hydrothermally solidified body obtained by the above method, since zeolite minerals that adsorb harmful substances are generated, it is possible to suppress the elution of harmful substances from the sewage sludge incineration ash. In addition, this method has a hydrothermal treatment temperature of 2
Since it is a relatively low temperature of 00 ° C. or lower, there is also an advantage that it is possible to realize suppression of elution of harmful substances from sewage sludge incineration ash with a small amount of energy.

【0007】[0007]

【発明が解決しようとする課題】しかし、上記公報記載
の下水汚泥焼却灰からの有害物質の溶出抑制方法では、
下水汚泥焼却灰からゼオライト系鉱物を生成することに
より有害物質の溶出抑制を行っているだけであり、下水
汚泥焼却灰中に多量に含まれているP25分を利用する
ことについて、全く考慮がなされていなかった。このた
め、この方法では、P25分が有害物質の溶出抑制に寄
与せず、有害物質の抑制効果が十分でない。
However, in the method for suppressing the elution of harmful substances from the sewage sludge incineration ash described in the above publication,
The sewage sludge incineration ash only produces zeolitic minerals to suppress the elution of harmful substances, and the use of a large amount of P 2 O 5 contained in the sewage sludge incineration ash is totally No consideration was given. Therefore, in this method, the P 2 O 5 content does not contribute to the suppression of elution of harmful substances, and the effect of suppressing harmful substances is not sufficient.

【0008】本発明は、上記従来の実情に鑑みてなされ
たものであり、有害物質の溶出抑制効果がより大きな溶
出抑制方法を提供することを解決すべき課題としてい
る。
The present invention has been made in view of the above conventional circumstances, and an object of the present invention is to provide an elution suppressing method having a greater effect of suppressing elution of harmful substances.

【0009】[0009]

【課題を解決するための手段】発明者らは、上記課題解
決のために鋭意研究を行い、下水汚泥焼却灰に含まれて
いるP25分を利用してアパタイト(apatite)属を生
じさせれば、有害物質がアパタイト属中に固定され、有
害物質の溶出を抑制できることを発見し、本発明を完成
するに至った。
[Means for Solving the Problems] The inventors of the present invention have conducted diligent research to solve the above problems, and generate apatite genus using P 2 O 5 contained in sewage sludge incineration ash. By doing so, it was discovered that harmful substances were fixed in the genus Apatite and the elution of harmful substances could be suppressed, and the present invention was completed.

【0010】すなわち、本発明の下水汚泥焼却灰からの
有害物質の溶出抑制方法は、下水汚泥焼却灰に活性カル
シウム源を混合してなる水熱固化用調合物を用意する調
合工程と、該水熱固化用調合物を成形して成形体とする
成形工程と、該成形体を水熱処理し、ケイ酸カルシウム
水和物を生じて固化しているとともにアパタイト属を生
じた水熱固化体を得る水熱工程とを有することを特徴と
する。
That is, the method for suppressing the release of harmful substances from the sewage sludge incineration ash according to the present invention comprises a preparation step of preparing a hydrothermal solidification formulation prepared by mixing an activated calcium source with the sewage sludge incineration ash, A molding step of molding the heat-solidifying composition into a molded body, and hydrothermally treating the molded body to obtain a hydrothermally solidified body which is calcium silicate hydrate and is solidified and also apatite genus is formed. And a hydrothermal process.

【0011】発明者らの試験結果によれば、下水汚泥焼
却灰に活性カルシウム源を混合し、得られた水熱固化用
調合物で成形した成形体を水熱処理した場合、ケイ酸カ
ルシウム水和物を生じて固化した水熱固化体にはアパタ
イト属が多量に生成する。つまり、本発明の溶出抑制方
法では、水熱工程において、水熱固化用調合物中に含ま
れている下水汚泥焼却灰のP25分と、活性カルシウム
源のカルシウム分とが反応し、アパタイト属が生じる。
そして、その水熱固化体からはヒ素及びセレニウムが溶
出しにくいことを発見した。このため、こうして水熱固
化体を製造すれば、アパタイト属にそれらの有害物質が
固定され、有害物質の溶出を抑制できることがわかる。
According to the test results of the inventors, when a sewage sludge incineration ash is mixed with an active calcium source and the obtained molded product is hydrothermally treated, calcium silicate hydrate is obtained. A large amount of genus Apatite is produced in the hydrothermally solidified product that is solidified by producing a substance. That is, in the elution suppressing method of the present invention, in the hydrothermal step, the P 2 O 5 content of the sewage sludge incineration ash contained in the hydrothermal solidification formulation reacts with the calcium content of the active calcium source, Apatite genus occurs.
And, it was discovered that arsenic and selenium were difficult to elute from the hydrothermally solidified body. Therefore, it can be seen that when the hydrothermally solidified product is produced in this manner, the harmful substances are fixed to the genus Apatite and the elution of the harmful substances can be suppressed.

【0012】したがって、この溶出抑制方法を採用すれ
ば、有害物質の溶出をより一層抑制することができる。
Therefore, if this elution suppressing method is adopted, the elution of harmful substances can be further suppressed.

【0013】また、この溶出抑制方法によれば、有害物
質の溶出を抑制した水熱固化体を製造することができる
ため、無機廃棄物の処分に困窮することなく、建材等の
製品が得られ、循環型社会の構築という社会的要請を実
現することができる。
Further, according to this method for suppressing elution, since a hydrothermally solidified body in which elution of harmful substances is suppressed can be produced, a product such as a building material can be obtained without difficulty in the disposal of inorganic waste. The social demand of building a recycling-based society can be realized.

【0014】本発明の溶出抑制方法では、水熱固化用調
合物に下水汚泥焼却灰以外の無機廃棄物、例えば陶磁器
廃棄物、生素地屑、釉薬汚泥、キラ、ガラス屑、鋳込砂
屑、スラグ、フライアッシュ、石灰灰、焼却飛灰、都市
ゴミ焼却灰、コンクリートがら、建設汚泥等の1種又は
複数種を混合することもできる。こうして下水汚泥焼却
灰とともに多くの他の無機廃棄物を再利用すれば、より
一層循環型社会の構築を実現することができる。なお、
他の無機廃棄物がアパタイト属によって固定しにくい有
害物質を含有している場合には、本発明の溶出抑制方法
を実施する前の前処理として、その無機廃棄物中の有害
物質を低減又は除去しておいた方が好ましい。
In the method for suppressing elution of the present invention, the formulation for hydrothermal solidification contains inorganic wastes other than sewage sludge incineration ash, such as ceramic waste, raw trash, glaze sludge, killer, glass waste, casting sand scrap, One or more kinds of slag, fly ash, lime ash, incineration fly ash, municipal waste incineration ash, concrete dust, construction sludge and the like can be mixed. In this way, by recycling many other inorganic wastes together with the sewage sludge incineration ash, it is possible to realize a more recycling-based society. In addition,
When other inorganic waste contains a harmful substance that is difficult to be fixed by the genus Apatite, the harmful substance in the inorganic waste is reduced or removed as a pretreatment before carrying out the elution suppressing method of the present invention. It is preferable to have it.

【0015】水熱固化用調合物は活性アルカリ源を含む
ことが好ましい。活性アルカリ源はゼオライトの構成元
素であるアルカリ分を含むため、こうであれば、水熱工
程において水熱固化体中にゼオライトを生じる。そし
て、そのゼオライトが水熱固化体中の有害物質を吸着す
る。このため、水熱固化体からの有害物質の溶出がアパ
タイト属及びゼオライトによって抑制され、無機廃棄物
からの有害物質の溶出をより一層抑制することができ
る。
The hydrothermal setting formulation preferably comprises a source of active alkali. Since the active alkali source contains an alkali component which is a constituent element of zeolite, if this is the case, zeolite is produced in the hydrothermally solidified body in the hydrothermal step. Then, the zeolite adsorbs the harmful substance in the hydrothermally solidified body. Therefore, the elution of harmful substances from the hydrothermally solidified body is suppressed by the apatite genus and zeolite, and the elution of harmful substances from the inorganic waste can be further suppressed.

【0016】活性アルカリ源としては、NaOH、KO
H、Na2CO3、K2CO3、NaNO3、KNO3等を採
用することができる。また、活性アルカリ源として、下
水汚泥焼却灰、焼却飛灰等のアルカリ分を多く含む無機
廃棄物を採用したり、水ガラス等を採用したりすること
もできる。
As the active alkali source, NaOH, KO
H, Na 2 CO 3 , K 2 CO 3 , NaNO 3 , KNO 3 or the like can be used. Further, as the active alkali source, it is also possible to adopt sewage sludge incineration ash, incineration fly ash or other inorganic waste containing a large amount of alkali, or water glass or the like.

【0017】活性カルシウム源としては消石灰や生石灰
を採用することができる。この中でも消石灰は安価であ
るため好ましい。
Slaked lime or quick lime can be adopted as the active calcium source. Of these, slaked lime is preferable because it is inexpensive.

【0018】発明者らは、本発明の溶出抑制方法によっ
て生じるアパタイト属がハイドロキシアパタイト(Ca
10(PO46(OH)2)であることを試験結果によっ
て確認した。なお、発明者らは、本発明の溶出抑制方法
において、下水汚泥焼却灰の代わりに都市ゴミ焼却飛灰
を用いた場合、ハイドロキシエレスタダイト(Ca
10(SiO4)(SO43(OH)2)を生じ、その水熱
固化体から鉛が溶出しにくいことを発見している。
The inventors have found that the genus Apatite produced by the elution suppressing method of the present invention is hydroxyapatite (Ca
It was confirmed by the test results that it was 10 (PO 4 ) 6 (OH) 2 ). In addition, in the elution suppressing method of the present invention, when the inventors used municipal waste incineration fly ash in place of sewage sludge incineration ash, the inventors of the present invention used hydroxyelestadite (Ca
It has been discovered that 10 (SiO 4 ) (SO 4 ) 3 (OH) 2 ) is produced and lead is difficult to elute from the hydrothermally solidified body.

【0019】本発明の溶出抑制方法は乾式プレス法によ
り成形工程を行なう場合に効果が大きい。水を大量に使
用して成形する方法では下水汚泥焼却灰等の無機廃棄物
から有害物質が溶出するおそれがあるが、乾式プレス法
により成形体を成形するのであればこのようなおそれが
極めて低いからである。
The elution suppressing method of the present invention is highly effective when the molding step is performed by the dry pressing method. Hazardous substances may elute from inorganic waste such as sewage sludge incineration ash in the method of molding using a large amount of water, but such a risk is extremely low if the molded body is molded by the dry pressing method. Because.

【0020】[0020]

【発明の実施の形態】以下、本発明を具体化した実施例
を説明する。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments embodying the present invention will be described below.

【0021】「調合工程」愛知県内の焼却場で生じた下
水汚泥焼却灰を用意し、これを粉砕することなくそのま
ま用いる。この下水汚泥焼却灰の化学組成を表1に示
す。また、活性カルシウム源としての消石灰を用意す
る。
[Preparation Process] Sewage sludge incineration ash produced at an incinerator in Aichi Prefecture is prepared and used as it is without crushing. The chemical composition of this sewage sludge incineration ash is shown in Table 1. In addition, slaked lime as an active calcium source is prepared.

【0022】[0022]

【表1】 [Table 1]

【0023】表1に示すように、この下水汚泥焼却灰中
には、P25分が多量に含まれている。また、これには
活性アルカリ源として、K2O及びNa20も含まれてい
る。この下水汚泥焼却灰と消石灰とを8:2の質量比で
混合し、水熱固化用調合物を得る。
As shown in Table 1, this sewage sludge incinerator ash contains a large amount of P 2 O 5 content. It also contains K 2 O and Na 2 0 as active alkali sources. This sewage sludge incineration ash and slaked lime are mixed in a mass ratio of 8: 2 to obtain a hydrothermal solidification formulation.

【0024】「成形工程」次に、上記水熱固化用調合物
をプレス機により30MPaの成形圧力で常温乾式一軸
加圧成形し、40×15×10mmの成形体を得る。
[Molding Step] Next, the hydrothermal solidification composition is subjected to room temperature dry uniaxial pressure molding at a molding pressure of 30 MPa with a pressing machine to obtain a molded body of 40 × 15 × 10 mm.

【0025】「水熱工程」さらに、上記成形体に180
°Cで6時間の水熱処理を行った後、80°Cで2日間
の乾燥を行う。こうして、実施例の水熱固化体を得る。
"Hydrothermal step" Further, the above-mentioned molded body is subjected to 180
After hydrothermal treatment at 6 ° C for 6 hours, drying is performed at 80 ° C for 2 days. Thus, the hydrothermally solidified body of the example is obtained.

【0026】(評価) <X線回折スペクトルの測定>上記成形体及び実施例の
水熱固化体について、X線回折スペクトルの測定を行っ
た。図1に示すように、成形体では、消石灰に基づく大
きなX線のピークが認められる。これに対し、実施例の
水熱固化体では、図2に示すように、消石灰に基づくX
線のピークは極めて小さくなり、それに替わってハイド
ロキシアパタイトに基づくピークが認められることがわ
かる。
(Evaluation) <Measurement of X-ray diffraction spectrum> The X-ray diffraction spectrum of the molded body and the hydrothermally solidified body of the example were measured. As shown in FIG. 1, in the molded body, a large X-ray peak based on slaked lime is observed. On the other hand, in the hydrothermally solidified body of the example, as shown in FIG.
It can be seen that the peak of the line becomes extremely small and a peak due to hydroxyapatite is observed instead.

【0027】以上の結果から、実施例の溶出抑制方法で
は、水熱工程において消石灰と下水汚泥焼却灰中のP2
5分とが反応し、アパタイト属の一種であるハイドロ
キシアパタイトを生じていることがわかる。
From the above results, in the elution suppressing method of the embodiment, P 2 in slaked lime and sewage sludge incinerated ash in the hydrothermal process is used.
It can be seen that O 5 minutes react with each other to form hydroxyapatite, which is a kind of apatite genus.

【0028】<有害物質属の溶出試験>下水汚泥焼却灰
及び実施例の水熱固化体について、重金属の溶出試験を
行った。有害物質の溶出試験は環境庁告示第46号の方
法により行った。結果を表2に示す。
<Dissolution Test of Hazardous Substances> Heavy metal dissolution tests were conducted on the sewage sludge incineration ash and the hydrothermally solidified products of the examples. The elution test of harmful substances was carried out according to the method of Environmental Agency Notification No. 46. The results are shown in Table 2.

【0029】[0029]

【表2】 [Table 2]

【0030】表2からわかるように、下水汚泥焼却灰中
にはヒ素が0.1mg/L、セレニウムが0.2mg/
L含まれており、大幅に土壌環境基準値を超えている。
これに対し、実施例の水熱固化体では、ヒ素が0.00
6mg/L未満、セレニウムが0.004mg/L未満
となり、いずれも土壌環境基準値を下回っている。
As can be seen from Table 2, 0.1 mg / L of arsenic and 0.2 mg / L of selenium in the sewage sludge incineration ash.
L is included, which greatly exceeds the soil environmental standard value.
On the other hand, in the hydrothermally solidified body of the example, arsenic is 0.00
It is less than 6 mg / L and selenium is less than 0.004 mg / L, both of which are below the soil environmental standard value.

【0031】これらの結果から、実施例の溶出抑制方法
によれば、下水汚泥焼却灰中のヒ素及びセレニウムの溶
出を抑制できることがわかる。これは、水熱工程におい
て生じたハイドロキシアパタイト中にヒ素やセレニウム
が固定されたことによるものと考えられる。
From these results, it is understood that the elution suppressing method of the embodiment can suppress the elution of arsenic and selenium in the sewage sludge incineration ash. It is considered that this is because arsenic and selenium were fixed in the hydroxyapatite produced in the hydrothermal process.

【0032】また、実施例において使用した下水汚泥焼
却灰中には、活性アルカリ源としてK2O及びNa2Oが
含まれている。このため、実施例の水熱固化体中にはゼ
オライトを生じていると考えられ、そのゼオライトによ
ってもヒ素やセレニウム等の有害物質の溶出が抑制され
ていると推定される。
The sewage sludge incineration ash used in the examples contains K 2 O and Na 2 O as active alkali sources. Therefore, it is considered that zeolite is produced in the hydrothermally solidified body of the example, and it is presumed that the zeolite also suppresses the elution of harmful substances such as arsenic and selenium.

【0033】したがって、この溶出抑制方法を採用すれ
ば、有害物質の溶出をより一層抑制することができるこ
とがわかる。
Therefore, it is understood that the use of this elution suppressing method can further suppress the elution of harmful substances.

【0034】また、この溶出抑制方法によれば、有害物
質の溶出を抑制した水熱固化体を製造することができる
ため、無機廃棄物の処分に困窮することなく、建材等の
製品が得られ、循環型社会の構築という社会的要請を実
現することができる。
Further, according to this method for suppressing elution, since a hydrothermally solidified body in which the elution of harmful substances is suppressed can be produced, a product such as a building material can be obtained without difficulty in the disposal of inorganic waste. The social demand of building a recycling-based society can be realized.

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例の成形体のX線回折スペクトルである。FIG. 1 is an X-ray diffraction spectrum of a molded product of an example.

【図2】実施例の水熱固化体のX線回折スペクトルであ
る。
FIG. 2 is an X-ray diffraction spectrum of the hydrothermally solidified body of the example.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) C04B 28/18 B09B 3/00 ZAB // C04B 111:20 304G (72)発明者 井須 紀文 愛知県常滑市鯉江本町5丁目1番地 株式 会社イナックス内 (72)発明者 前浪 洋輝 愛知県常滑市鯉江本町5丁目1番地 株式 会社イナックス内 (72)発明者 久野 裕明 愛知県常滑市鯉江本町5丁目1番地 株式 会社イナックス内 Fターム(参考) 4D004 AA36 AB03 AB05 BA02 CA03 CA22 CA34 CA45 CB31 CC03 CC12 CC13 4G012 PA14 PA35 PB03 PE06 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) C04B 28/18 B09B 3/00 ZAB // C04B 111: 20 304G (72) Inventor Kibun Tokoname, Aichi prefecture 5-1-1 Koiemotocho, Kochi-shi, Inax Co., Ltd. (72) Inventor, Hiroki Maenami 5-1-1 Koioehoncho, Tokoname-shi, Aichi Prefecture Inakusu Co., Ltd. (72) Hiroaki Kuno 5-chome, Koiemoto-cho, Tokoname-shi, Aichi Prefecture No. 1 F-term in Inax Co., Ltd. (reference) 4D004 AA36 AB03 AB05 BA02 CA03 CA22 CA34 CA45 CB31 CC03 CC12 CC13 4G012 PA14 PA35 PB03 PE06

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】下水汚泥焼却灰に活性カルシウム源を混合
してなる水熱固化用調合物を用意する調合工程と、 該水熱固化用調合物を成形して成形体とする成形工程
と、 該成形体を水熱処理し、ケイ酸カルシウム水和物を生じ
て固化しているとともにアパタイト属を生じた水熱固化
体を得る水熱工程とを有する下水汚泥焼却灰からの有害
物質の溶出抑制方法。
1. A blending step of preparing a hydrothermal solidification formulation prepared by mixing sewage sludge incineration ash with an active calcium source, and a molding step of shaping the hydrothermal solidification formulation into a molded body. Hydrothermal treatment of the molded body to produce calcium silicate hydrate and solidify, and a hydrothermal process for obtaining a hydrothermally solidified body in which apatite genus is produced, and suppression of elution of harmful substances from sewage sludge incineration ash Method.
【請求項2】水熱固化用調合物は活性アルカリ源を含む
ことを特徴とする請求項1記載の下水汚泥焼却灰からの
有害物質の溶出抑制方法。
2. The method for suppressing elution of harmful substances from sewage sludge incineration ash according to claim 1, wherein the hydrothermal solidification composition contains an active alkali source.
【請求項3】活性カルシウム源は消石灰であることを特
徴とする請求項1又は2記載の下水汚泥焼却灰からの有
害物質の溶出抑制方法。
3. The method for suppressing elution of harmful substances from sewage sludge incineration ash according to claim 1, wherein the active calcium source is slaked lime.
【請求項4】アパタイト属はハイドロキシアパタイトで
あることを特徴とする請求項1乃至3のいずれか1項記
載の下水汚泥焼却灰からの有害物質の溶出抑制方法。
4. The method for suppressing elution of harmful substances from sewage sludge incineration ash according to claim 1, wherein the genus Apatite is hydroxyapatite.
【請求項5】成形工程は乾式プレス法によることを特徴
とする請求項1乃至4のいずれか1項記載の下水汚泥焼
却灰からの有害物質の溶出抑制方法。
5. The method for suppressing the elution of harmful substances from sewage sludge incineration ash according to claim 1, wherein the forming step is performed by a dry pressing method.
JP2002082057A 2002-03-22 2002-03-22 Method for suppressing elution of harmful substance from sewage sludge incineration ash Pending JP2003275730A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Publication Number Publication Date
JP2003275730A true JP2003275730A (en) 2003-09-30

Family

ID=29206663

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Application Number Title Priority Date Filing Date
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Country Link
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008000707A (en) * 2006-06-23 2008-01-10 Natoo Kenkyusho:Kk Method of reforming phosphorus-containing burned ash and pollution-free phosphorus-containing recycle material
JP2014189418A (en) * 2013-03-26 2014-10-06 Est Japan:Kk Metal ion elution inhibitor and metal corrosion inhibition method using the same
JP2020142933A (en) * 2019-03-04 2020-09-10 太平洋セメント株式会社 Manufacturing method of cement
JP2020142934A (en) * 2019-03-04 2020-09-10 太平洋セメント株式会社 Manufacturing method of cement

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008000707A (en) * 2006-06-23 2008-01-10 Natoo Kenkyusho:Kk Method of reforming phosphorus-containing burned ash and pollution-free phosphorus-containing recycle material
JP2014189418A (en) * 2013-03-26 2014-10-06 Est Japan:Kk Metal ion elution inhibitor and metal corrosion inhibition method using the same
JP2020142933A (en) * 2019-03-04 2020-09-10 太平洋セメント株式会社 Manufacturing method of cement
JP2020142934A (en) * 2019-03-04 2020-09-10 太平洋セメント株式会社 Manufacturing method of cement

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