JP2003320397A - Incineration treatment method for sewage sludge - Google Patents
Incineration treatment method for sewage sludgeInfo
- Publication number
- JP2003320397A JP2003320397A JP2002127863A JP2002127863A JP2003320397A JP 2003320397 A JP2003320397 A JP 2003320397A JP 2002127863 A JP2002127863 A JP 2002127863A JP 2002127863 A JP2002127863 A JP 2002127863A JP 2003320397 A JP2003320397 A JP 2003320397A
- Authority
- JP
- Japan
- Prior art keywords
- sewage sludge
- sludge
- calcium carbonate
- containing powder
- mass
- 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.)
- Granted
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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、下水汚泥の焼却処
理方法に関し、さらに詳しくは、土質改良材として利用
可能な汚泥焼却灰を得るための下水汚泥の焼却処理方法
する。TECHNICAL FIELD The present invention relates to a method for incinerating sewage sludge, and more particularly to a method for incinerating sewage sludge to obtain sludge incineration ash that can be used as a soil conditioner.
【０００２】[0002]
【従来の技術】下水汚泥のほとんどは、従来より、焼却
処理により減量化されたのち、埋立て処分されている。
しかし、最近では、埋立て用地の確保が困難になりつつ
あるという問題がある。このため下水汚泥を生石灰粉末
とともに焼成して、酸化カルシウム粉末を含む汚泥焼却
灰（この汚泥焼却灰を再生生石灰や再生石灰組成物とい
うことがある）を得て、この汚泥焼却灰を、セメントの
原料や土質改良材として利用する汚泥焼却灰の再利用シ
ステムが注目されている。2. Description of the Related Art Most of the sewage sludge has been conventionally disposed of in landfill after being reduced in volume by incineration.
However, recently, there is a problem that it is becoming difficult to secure landfill sites. Therefore, sewage sludge is fired with quicklime powder to obtain sludge incineration ash containing calcium oxide powder (this sludge incineration ash is sometimes referred to as regenerated quicklime or regenerated lime composition), and this sludge incineration ash Attention has been paid to a reuse system of sludge incineration ash used as a raw material and a soil improvement material.
【０００３】酸化カルシウム粉末を含む汚泥焼却灰を得
る下水汚泥の焼却処理方法は、特開平６−１５２９７号
公報に提案されている。この公報では、下水汚泥と生石
灰類とを混合して、下水汚泥を脱水及び乾燥し、有機物
と消石灰とからなる固形分を得る汚泥脱水乾燥工程と、
汚泥脱水乾燥工程で生成した固形分を加熱して有機物を
焼却するとともに有機物の燃焼熱によって消石灰を焼成
して、生石灰に再生する焼却再生工程とからなる下水汚
泥の焼却システムが記載されている。この公報によれ
ば、再生された生石灰は、汚泥脱水乾燥工程用の生石灰
類として使用したり、セメント原料もしくは土質改良材
として利用できる。A method for incinerating sewage sludge to obtain sludge incineration ash containing calcium oxide powder has been proposed in Japanese Patent Application Laid-Open No. 6-15297. In this publication, a sewage sludge and quicklime are mixed, a sewage sludge is dehydrated and dried, and a sludge dewatering and drying step for obtaining a solid content consisting of organic matter and slaked lime,
A sewage sludge incineration system is described which comprises a solid content produced in the sludge dewatering / drying step to incinerate organic matter, and at the same time burns slaked lime by the heat of combustion of the organic matter to regenerate it into quicklime. According to this publication, the regenerated quick lime can be used as quick lime for sludge dewatering and drying step, or as a cement raw material or a soil improvement material.
【０００４】特開２０００−６３８２９号公報には、土
質改良材として有利に利用できる酸化カルシウム粉末を
含む汚泥焼却灰が提案されている。この公報では、酸中
和活性が、汚泥焼却灰中の生石灰の質量５０ｇあたり３
１０ｍＬ以上である汚泥焼却灰が土質改良材として好適
に利用できると記載されている。Japanese Unexamined Patent Publication No. 2000-63829 proposes sludge incineration ash containing calcium oxide powder, which can be advantageously used as a soil conditioner. In this publication, the acid neutralization activity is 3 per 50 g of quicklime in sludge incineration ash.
It is described that sludge incineration ash having a volume of 10 mL or more can be suitably used as a soil improvement material.
【０００５】上記の下水汚泥を生石灰粉末とともに焼却
して、酸化カルシウム粉末を含む汚泥焼却灰を得る下水
汚泥の焼却処理は、汚泥焼却灰の有効利用という観点か
ら見れば好ましい処理方法である。しかしながら、生石
灰粉末は、安価であることが望まれている土質改良材の
原料として用いるには適当でない場合がある。The incineration of sewage sludge by incineration with lime powder to obtain sludge incineration ash containing calcium oxide powder is a preferable treatment method from the viewpoint of effective utilization of sludge incineration ash. However, quicklime powder may not be suitable for use as a raw material for a soil improvement material that is desired to be inexpensive.
【０００６】[0006]
【発明が解決しようとする課題】本発明の目的は、工業
的に安価に入手できる材料を用いながらも、土質改良材
として有利に使用できる汚泥焼却灰を得ることができる
下水汚泥の焼却処理方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for incinerating sewage sludge capable of obtaining sludge incineration ash that can be advantageously used as a soil improvement agent while using materials that are industrially available at low cost. To provide.
【０００７】[0007]
【課題を解決するための手段】本発明者は、酸化カルシ
ウム粉末が、石灰石やドロマイトなどの炭酸カルシウム
含有鉱石もしくは貝殻を、下水汚泥の焼却温度として一
般的な温度である８５０〜９５０℃の温度で焼成して製
造されていることに着目した。そして、本発明者が、下
水汚泥を炭酸カルシウム含有粉末とともに焼成したとこ
ろ、得られた汚泥焼却灰には酸化カルシウム含有粉末が
含まれており、この汚泥焼却灰が土質改良材として有利
に使用できることを見出した。Means for Solving the Problems The present inventor has found that calcium oxide powder is used for calcination of calcium carbonate-containing ores such as limestone and dolomite or shells at a temperature of 850 to 950 ° C. which is a general temperature for incineration of sewage sludge. We paid attention to that it is manufactured by firing at. Then, when the present inventor fired the sewage sludge together with the calcium carbonate-containing powder, the obtained sludge incineration ash contained calcium oxide-containing powder, and this sludge incineration ash can be advantageously used as a soil conditioner. Found.
【０００８】本発明は、下水汚泥を炭酸カルシウム含有
粉末とともに焼成して、酸化カルシウム含有粉末を含む
汚泥焼却灰を得ることを特徴とする下水汚泥の焼却処理
方法にある。The present invention resides in a method for incinerating sewage sludge, which comprises calcination of sewage sludge with powder containing calcium carbonate to obtain sludge incineration ash containing powder containing calcium oxide.
【０００９】本発明の方法においては、下水汚泥と炭酸
カルシウム含有粉末とを循環流動炉にて焼成することが
好ましい。また、下水汚泥とともに焼成する炭酸カルシ
ウム含有粉末の量は、下水汚泥１００質量部に対して、
２５〜２００質量部の範囲にあることが好ましい。In the method of the present invention, it is preferable to calcine the sewage sludge and the calcium carbonate-containing powder in a circulating fluidized furnace. In addition, the amount of the calcium carbonate-containing powder that is fired with the sewage sludge is 100 parts by mass of the sewage sludge,
It is preferably in the range of 25 to 200 parts by mass.
【００１０】本発明はまた、酸化カルシウム含有粉末を
含む汚泥焼却灰製造用の炭酸カルシウム含有粉末にもあ
る。The invention also resides in a calcium carbonate-containing powder for the production of sludge incineration ash, which comprises a calcium oxide-containing powder.
【００１１】本発明の炭酸カルシウム含有粉末は、炭酸
カルシウム含有粉末が、粒子径が１ｍｍを超える粒子の
含有量が１質量％以下であることが好ましい。炭酸カル
シウム含有粉末は、石灰石もしくは貝殻の粉砕物である
ことが好ましい。The calcium carbonate-containing powder of the present invention is preferably such that the calcium carbonate-containing powder has a content of particles having a particle diameter of more than 1 mm of 1% by mass or less. The calcium carbonate-containing powder is preferably crushed limestone or shell.
【００１２】[0012]
【発明の実施の形態】本発明の下水汚泥の焼却処理方法
では、下水汚泥を炭酸カルシウム含有粉末とともに焼成
して、酸化カルシウム含有粉末を含む汚泥焼却灰を得
る。すなわち、本発明の下水汚泥の焼却処理方法では、
下水汚泥の焼却と、炭酸カルシウム含有粉末の酸化とを
同時に行なう。下水汚泥と炭酸カルシウム含有粉末との
焼成は、８５０〜９５０℃の温度にて行なうことが好ま
しい。BEST MODE FOR CARRYING OUT THE INVENTION In the method for incinerating sewage sludge of the present invention, sewage sludge is fired together with calcium carbonate-containing powder to obtain sludge incineration ash containing calcium oxide-containing powder. That is, in the method for incinerating sewage sludge of the present invention,
Simultaneous incineration of sewage sludge and oxidation of calcium carbonate-containing powder. Firing of the sewage sludge and the calcium carbonate-containing powder is preferably performed at a temperature of 850 to 950 ° C.
【００１３】本発明において用いる炭酸カルシウム含有
粉末の炭酸カルシウム含有量は、３０質量％以上である
ことが好ましく、５０質量％以上がより好ましく、７０
質量％以上であることがさらに好ましい。炭酸カルシウ
ム含有粉末の具体的な例としては、石灰石やドロマイト
などの炭酸カルシウム含有鉱石もしくは貝殻の粉砕物を
挙げることができる。この中でも、石灰石もしくは貝殻
の粉砕物が好ましく、特に石灰石の粉砕物が好ましい。The calcium carbonate content of the calcium carbonate-containing powder used in the present invention is preferably 30% by mass or more, more preferably 50% by mass or more, and 70% by mass or more is preferable.
More preferably, it is at least mass%. Specific examples of calcium carbonate-containing powders include calcium carbonate-containing ores such as limestone and dolomite or crushed shells. Among these, crushed limestone or shells are preferable, and crushed limestone is particularly preferable.
【００１４】炭酸カルシウム含有粉末の粒子径には特別
な制限はなく、焼成炉の構成やサイズによって適宜選択
して用いることができるが、汚泥焼却灰への炭酸カルシ
ウムの混入を低減するには、粒子径の大きな粒子を含ま
ないものであることが好ましい。具体的には、炭酸カル
シウム含有粉末は、粒子径が１ｍｍを超える粒子の含有
量が１質量％以下であることが好ましい。There is no particular limitation on the particle size of the calcium carbonate-containing powder, which can be appropriately selected and used depending on the structure and size of the firing furnace. To reduce the mixing of calcium carbonate into the sludge incineration ash, It is preferable that the particles do not include particles having a large particle diameter. Specifically, the calcium carbonate-containing powder preferably has a content of particles having a particle diameter of more than 1 mm of 1% by mass or less.
【００１５】本発明の下水汚泥の焼却処理方法におい
て、下水汚泥と炭酸カルシウム含有粉末とを焼成する焼
成炉には、特には制限はないが、流動炉、特に循環流動
炉を用いることが好ましい。以下、本発明の方法につい
て、焼却炉に循環流動炉を用いる場合を例にとって、添
付図面を参照しながら説明する。In the method for incinerating sewage sludge of the present invention, the firing furnace for firing the sewage sludge and the calcium carbonate-containing powder is not particularly limited, but a fluidized furnace, particularly a circulating fluidized furnace is preferably used. Hereinafter, the method of the present invention will be described with reference to the accompanying drawings, taking the case of using a circulating fluidized furnace as an incinerator as an example.
【００１６】図１は、本発明の下水汚泥の焼却処理方法
を有利に実施することができる下水汚泥焼却処理装置の
一例の構成を示す図である。図１において、循環流動炉
１０は、燃焼室（ライザー）１１、燃焼室１１の上部に
接続するホットサイクロン１２、燃焼室１１とホットサ
イクロン１２とを連結するループシール１３、及び下水
汚泥と炭酸カルシウム含有粉末とを混合して燃焼室１１
に投入する混合投入機１４から構成されている。また、
燃焼室１１は、下方に流動層を形成するための空気を供
給する一次ブロワ１５と接続する一次空気導入口１６、
二次ブロワ１７と接続する二次空気導入口１８、及び下
水汚泥と炭酸カルシウム含有粉末との焼成用燃料を導入
するための燃料導入口１９を備えている。混合投入機１
４は、パドル式あるいはスクリュー式の混合機構を備え
たものであることが好ましい。FIG. 1 is a diagram showing the construction of an example of a sewage sludge incineration treatment apparatus which can advantageously carry out the sewage sludge incineration treatment method of the present invention. In FIG. 1, a circulating fluidized furnace 10 includes a combustion chamber (riser) 11, a hot cyclone 12 connected to the upper portion of the combustion chamber 11, a loop seal 13 connecting the combustion chamber 11 and the hot cyclone 12, and sewage sludge and calcium carbonate. Combustion chamber 11 by mixing with powder containing
It is composed of a mixing and charging machine 14 to be charged into. Also,
The combustion chamber 11 is connected to a primary blower 15 that supplies air for forming a fluidized bed below, and a primary air introduction port 16,
A secondary air inlet 18 connected to the secondary blower 17 and a fuel inlet 19 for introducing a fuel for burning sewage sludge and calcium carbonate-containing powder are provided. Mixing machine 1
4 is preferably equipped with a paddle type or screw type mixing mechanism.
【００１７】混合投入機１４により、燃焼室１１に投入
された下水汚泥と炭酸カルシウム含有粉末の混合物は、
燃焼室１１の下方にて流動媒体によって撹拌混合され、
下水汚泥中の有機成分は熱分解して可燃分ガスとなる。
この可燃分ガスは、汚泥焼却灰（灰分）及び流動媒体
（熱媒体）とともに燃焼室の上方に移動しながら燃焼し
て燃焼生成ガスとなる。炭酸カルシウム含有粉末は、燃
焼室１１の下方から流動媒体とともに上方に移動しなが
ら、炭酸カルシウムのほとんどが酸化され酸化カルシウ
ムとなり、その一部が、燃焼生成ガスに含まれる硫化物
や塩化物と反応して、硫酸カルシウム（石膏）や塩化カ
ルシウムとなる。燃焼室１１にて生成した燃焼生成ガ
ス、汚泥焼却灰、及び酸化カルシウム含有粉末は、流動
媒体とともにホットサイクロン１２に送られる。ホット
サイクロン１２にて、流動媒体は分離回収され、ループ
シール１３を介して、再び燃焼室１１に戻される。燃焼
生成ガス、汚泥焼却灰、酸化カルシウム含有粉末は、循
環流動炉１０の外部に取り出され、汚泥焼却灰回収装置
２０に送られる。汚泥焼却灰回収装置２０にて、汚泥焼
却灰と酸化カルシウム含有粉末とが分離回収され、焼却
灰取出し口２１から取り出される。燃焼生成ガスは、排
ガスファン２２を介して系外に排出される。The mixture of the sewage sludge and the calcium carbonate-containing powder charged into the combustion chamber 11 by the mixing and charging machine 14 is
Agitated and mixed by a fluidized medium below the combustion chamber 11,
Organic components in sewage sludge are thermally decomposed into combustible gas.
This combustible gas is combusted with the sludge incinerated ash (ash) and the fluid medium (heat medium) while moving above the combustion chamber to become combustion product gas. While the calcium carbonate-containing powder moves upward from the lower part of the combustion chamber 11 together with the fluidized medium, most of the calcium carbonate is oxidized to calcium oxide, and a part thereof reacts with sulfides and chlorides contained in the combustion product gas. Then, it becomes calcium sulfate (gypsum) or calcium chloride. The combustion product gas, the sludge incineration ash, and the calcium oxide-containing powder produced in the combustion chamber 11 are sent to the hot cyclone 12 together with the fluidized medium. The fluidized medium is separated and collected by the hot cyclone 12 and returned to the combustion chamber 11 again via the loop seal 13. The combustion product gas, sludge incineration ash, and calcium oxide-containing powder are taken out of the circulating fluidized furnace 10 and sent to the sludge incineration ash recovery device 20. The sludge incineration ash recovery device 20 separates and recovers the sludge incineration ash and the calcium oxide-containing powder, and takes out from the incineration ash extraction port 21. The combustion product gas is discharged to the outside of the system via the exhaust gas fan 22.
【００１８】循環流動炉１０では、流動媒体を炉内にて
循環させることによって、炉内温度分布を均一に保つこ
とができるので、下水汚泥と炭酸カルシウム含有粉末の
混合物に均一、かつ速やかに熱を与えることができる。
循環流動炉１０の炉内温度は、８５０〜９５０℃の範囲
にあることが好ましい。また、循環流動炉１０のサイ
ズ、及び流動媒体の移動速度は、下水汚泥と炭酸カルシ
ウム含有粉末との混合物が燃焼室１１に２秒以上滞留で
きるように調整されていることが好ましい。In the circulating fluidized furnace 10, since the temperature distribution in the furnace can be kept uniform by circulating the fluidized medium in the furnace, the mixture of the sewage sludge and the calcium carbonate-containing powder is heated uniformly and quickly. Can be given.
The temperature inside the circulating fluidized furnace 10 is preferably in the range of 850 to 950 ° C. The size of the circulating fluidized furnace 10 and the moving speed of the fluidized medium are preferably adjusted so that the mixture of sewage sludge and calcium carbonate-containing powder can stay in the combustion chamber 11 for 2 seconds or more.
【００１９】循環流動炉１０の流動媒体には、硅砂など
の通常の流動炉に使用されているものを用いることがで
きる。また、本発明の下水汚泥の焼却処理方法では、流
動媒体に炭酸カルシウム含有粉末を用いてもよい。具体
的には、粒度が０．１４９〜０．５９ｍｍに調製された
硅砂（ＪＩＳ−Ｇ−５９０１の２０号）もしくは炭酸カ
ルシウム含有粉末を用いることが好ましい。なお、粒度
が０．１４９〜０．５９ｍｍに調製された硅砂もしくは
炭酸カルシウム含有粉末を流動媒体に用いる場合には、
下水汚泥と混合する炭酸カルシウム含有粉末は、粒子径
が０．６ｍｍ（好ましくは０．５９ｍｍ）を超える粒子
の含有量が１質量％以下であることが好ましい。The fluidizing medium used in the circulating fluidizing furnace 10 may be silica sand or the like which is used in ordinary fluidizing furnaces. Further, in the method for incinerating sewage sludge of the present invention, calcium carbonate-containing powder may be used as the fluid medium. Specifically, it is preferable to use silica sand (JIS-G-5901 No. 20) or calcium carbonate-containing powder having a particle size of 0.149 to 0.59 mm. When silica sand or calcium carbonate-containing powder having a particle size of 0.149 to 0.59 mm is used as a fluid medium,
The calcium carbonate-containing powder to be mixed with the sewage sludge preferably has a content of particles having a particle size of 0.6 mm (preferably 0.59 mm) of 1% by mass or less.
【００２０】汚泥焼却灰回収装置２０には、サイクロ
ン、乾式電気集塵器あるいはバグフィルターなどの公知
の集塵器を用いることができる。好ましいのは、バグフ
ィルターである。As the sludge incineration ash recovery apparatus 20, a known dust collector such as a cyclone, a dry type electrostatic precipitator or a bag filter can be used. Preferred is a bag filter.
【００２１】図１では、下水汚泥と炭酸カルシウム含有
粉末とを混合して、循環流動炉１０に投入しているが、
下水汚泥と炭酸カルシウム含有粉末とを別々に投入して
もよい。また、循環流動炉１０と汚泥焼却灰回収装置２
０との間に熱交換器を設置してもよい。In FIG. 1, the sewage sludge and the calcium carbonate-containing powder are mixed and put into the circulating fluidized furnace 10.
Sewage sludge and calcium carbonate-containing powder may be added separately. Further, the circulating fluidized furnace 10 and the sludge incineration ash recovery device 2
A heat exchanger may be installed between 0 and 0.
【００２２】上記のようにして得られる汚泥焼却灰は、
通常は、粒子径が１０〜１００μｍの範囲にある。従っ
て、粉砕処理など二次加工を行わなくとも、軟弱土壌の
改質工法として知られている粉体噴射撹拌工法（ＤＪＭ
工法）用の土質改良材として利用することができる。本
発明の方法により得られる汚泥焼却灰は、酸化カルシウ
ムを７０〜９５質量％の範囲で含むことが好ましい。酸
化カルシウム含有量が７０質量％未満であると、土質改
良材としての効果が小さくなる傾向にある。The sludge incineration ash obtained as described above is
Usually, the particle size is in the range of 10 to 100 μm. Therefore, the powder injection stirring method (DJM), which is known as a method for modifying soft soil, does not require secondary processing such as crushing.
It can be used as a soil improvement material for construction method). The sludge incineration ash obtained by the method of the present invention preferably contains calcium oxide in the range of 70 to 95 mass%. If the calcium oxide content is less than 70% by mass, the effect as a soil conditioner tends to be small.
【００２３】[0023]
【実施例】以下、実施例により本発明を説明する。本実
施例にて用いた下水汚泥の性状を表１に示す。EXAMPLES The present invention will be described below with reference to examples. Table 1 shows the properties of the sewage sludge used in this example.
【００２４】[0024]
【表１】 表１ ─────────────────────────── 下水汚泥 ─────────────────────────── 含水率 ８３．５ 質量％ 強熱減量（at600℃） ７０．３ 質量％ 低位発熱量 １４．３ ＭＪ／ｋｇ 炭素（Ｃとして） ３３．７ 質量％ 水素（Ｈとして） ５．８ 質量％ 窒素 ６．０ 質量％ 酸素 ２４．８ 質量％ 燃焼性硫黄 ０．８８質量％ 全硫黄 １．２２質量％ 燃焼性塩素 ０．１２質量％ 全塩素 ０．１３質量％ カルシウム（ＣａＯとして） ２．５９質量％ ケイ素（ＳｉＯ2として） ７．５４質量％ 鉄（Ｆｅ2Ｏ3として） ５．９３質量％ アルミニウム（Ａｌ2Ｏ3として） ４．０１質量％ リン（Ｐ2Ｏ5として） ７．１６質量％ ───────────────────────────[Table 1] Table 1 ─────────────────────────── Sewage sludge ──────────────── ──────────── Moisture content 83.5% by mass Loss on ignition (at 600 ℃) 70.3% by mass Lower heating value 14.3 MJ / kg Carbon (as C) 33.7% by mass Hydrogen (as H) 5.8% by mass Nitrogen 6.0% by mass Oxygen 24.8% by mass Combustible sulfur 0.88% by mass Total sulfur 1.22% by mass Combustible chlorine 0.12% by mass Total chlorine 0.13 Mass% Calcium (as CaO) 2.59 mass% Silicon (as SiO 2 ) 7.54 mass% Iron (as Fe 2 O 3 ) 5.93 mass% Aluminum (as Al 2 O 3 ) 4.01 mass% Phosphorus (as P 2 O 5) 7.16 wt% ───────────────────────────
【００２５】［実施例１］
（１）汚泥石灰石混合物の製造
下水汚泥１００質量部に、２５質量部の石灰石粉末（粒
子径が０．６ｍｍを超える粒子の含有量が１質量％未
満、平均粒子径：０．３ｍｍ）を添加混合して、汚泥石
灰石混合物を製造した。この汚泥石灰石混合物は、含水
率は６７％であった。Example 1 (1) Production of Sludge-Limestone Mixture 100 parts by weight of sewage sludge, 25 parts by weight of limestone powder (content of particles having a particle size exceeding 0.6 mm is less than 1% by mass, average particles (Diameter: 0.3 mm) was added and mixed to produce a sludge limestone mixture. This sludge limestone mixture had a water content of 67%.
【００２６】（２）下水汚泥の焼成
上記の汚泥石灰石混合物を図１に示した汚泥焼却処理装
置を用いて焼却した。すなわち、燃焼室１１下部より空
気を送り、炉内の硅砂（粒度：０．１４９〜０．５９ｍ
ｍ）を循環させて、炉内温度を８５０℃に調整した後、
混合投入機１４から炉内に、１２５ｋｇ／時間の速度で
４８時間連続して汚泥石灰石混合物を投入し、汚泥焼却
灰回収装置２０（バグフィルター）にて汚泥焼却灰を分
離回収した。４８時間連続して汚泥石灰石混合物を焼成
して得られた汚泥焼却灰は９００ｋｇであった。得られ
た汚泥焼却灰の化学組成を表２に示す。(2) Firing of sewage sludge The above sludge limestone mixture was incinerated using the sludge incinerator shown in FIG. That is, air is sent from the lower part of the combustion chamber 11 and silica sand in the furnace (particle size: 0.149 to 0.59 m
m) is circulated to adjust the furnace temperature to 850 ° C.,
The sludge limestone mixture was continuously charged into the furnace from the mixing and charging device 14 at a rate of 125 kg / hour for 48 hours, and the sludge incineration ash was separated and collected by the sludge incineration ash recovery device 20 (bag filter). The sludge incineration ash obtained by firing the sludge limestone mixture continuously for 48 hours was 900 kg. Table 2 shows the chemical composition of the obtained sludge incineration ash.
【００２７】上記の汚泥焼却灰と土壌（一軸圧縮強さ：
０．１３ｋｇ・ｆ／ｃｍ2、ＣＢＲ値：０．２％）と
を、汚泥焼却灰含有量が３０ｋｇ／ｍ3、６０ｋｇ／
ｍ3、及び９０ｋｇ／ｍ3となるように配合割合を変えて
混合し、三種の土壌汚泥焼却灰混合物を調製した。上記
の三種の土壌汚泥焼却灰混合物の一軸圧縮強さを、ＪＩ
Ｓ−Ａ−１２１６：１９９８に準じて測定した。その結
果を図２に示す。なお、一軸圧縮強さの測定は、土壌汚
泥焼却灰混合物を調製してから７日経過後と２８日経過
後に行なった。上記の三種の土壌汚泥焼却灰混合物のＣ
ＢＲ値を、ＪＩＳ−Ａ−１２１１：１９９８に準じて測
定した。その結果を図３に示す。The above sludge incineration ash and soil (uniaxial compressive strength:
0.13 kgf / cm 2 , CBR value: 0.2%), sludge incineration ash content of 30 kg / m 3 , 60 kg /
m 3, and were mixed by changing the mixing ratio so that 90 kg / m 3, were prepared three kinds of soil sludge incinerated ash mixture. The uniaxial compressive strength of the above-mentioned three types of soil sludge incineration ash mixture was determined by JI
It was measured according to S-A-1216: 1998. The result is shown in FIG. The uniaxial compressive strength was measured 7 days and 28 days after the soil sludge incineration ash mixture was prepared. C of the above three types of soil sludge incineration ash mixture
The BR value was measured according to JIS-A-1211: 1998. The result is shown in FIG.
【００２８】［比較例１］下水汚泥に石灰石粉末を加え
ない以外は、実施例１と同じ条件で下水汚泥を焼却し
た。得られた汚泥焼却灰の化学組成を表２に示す。上記
の汚泥焼却灰と実施例１にて用いた土壌と同じ性状の土
壌とを、汚泥焼却灰含有量が３０ｋｇ／ｍ3、６０ｋｇ
／ｍ3、及び９０ｋｇ／ｍ3となるように配合割合を変え
て混合し、三種の土壌汚泥焼却灰混合物を調製した。上
記の三種の土壌汚泥焼却灰混合物の一軸圧縮強さを、Ｊ
ＩＳ−Ａ−１２１６：１９９８に準じて測定した。その
結果を図２に示す。なお、一軸圧縮強さの測定は、土壌
汚泥焼却灰混合物を調製してから７日経過後に行なっ
た。上記の三種の土壌汚泥焼却灰混合物のＣＢＲ値を、
ＪＩＳ−Ａ−１２１１：１９９８に準じて測定した。そ
の結果を図３に示す。[Comparative Example 1] The sewage sludge was incinerated under the same conditions as in Example 1 except that limestone powder was not added to the sewage sludge. Table 2 shows the chemical composition of the obtained sludge incineration ash. The sludge incinerated ash and the soil having the same properties as the soil used in Example 1 were used, and the sludge incinerated ash content was 30 kg / m 3 , 60 kg.
/ M 3 and 90 kg / m 3 , the mixing ratio was changed and mixed to prepare three types of soil sludge incineration ash mixture. The uniaxial compressive strength of the above three types of soil sludge incineration ash mixture was
It was measured according to IS-A-1216: 1998. The result is shown in FIG. The uniaxial compressive strength was measured 7 days after the soil sludge incineration ash mixture was prepared. The CBR value of the above three types of soil sludge incineration ash mixture,
It was measured according to JIS-A-1211: 1998. The result is shown in FIG.
【００２９】[0029]
【表２】 表２ ─────────────────────────────── 実施例１ 比較例１ ─────────────────────────────── ＣａＯ（質量％） ７４．７ ６．３ ＳｉＯ2（質量％） １０．１ ３８．６ Ｆｅ2Ｏ3（質量％） １．０ ４．９ Ａｌ2Ｏ3（質量％） ０．８ １４．８ その他（質量％） １３．４ ３５．４ ───────────────────────────────[Table 2] Table 2 ─────────────────────────────── Example 1 Comparative Example 1 ─────── ──────────────────────── CaO (mass%) 74.7 6.3 SiO 2 (mass%) 10.1 38.6 Fe 2 O 3 (mass%) 1.0 4.9 Al 2 O 3 (mass%) 0.8 14.8 Others (mass%) 13.4 35.4 ─────────────── ─────────────────
【００３０】［参考例１］下記の表３に示す化学組成を
有する市販の生石灰粉末と実施例１にて用いた土壌と同
じ性状の土壌とを、生石灰含有量が３０ｋｇ／ｍ3、６
０ｋｇ／ｍ3、及び９０ｋｇ／ｍ3となるように配合割合
を変えて混合し、三種の土壌生石灰混合物を調製した。Reference Example 1 Commercially available quicklime powder having the chemical composition shown in Table 3 below and soil having the same properties as the soil used in Example 1 were used, and the quicklime content was 30 kg / m 3 , 6
Three types of soil quicklime mixtures were prepared by mixing the mixture at different compounding ratios of 0 kg / m 3 and 90 kg / m 3 .
【００３１】[0031]
【表３】 表３ ──────────────────── 生石灰粉末 ──────────────────── ＣａＯ（質量％） ９５．３ ＳｉＯ2（質量％） １．３ Ｆｅ2Ｏ3（質量％） ０．７ Ａｌ2Ｏ3（質量％） ０．２ その他（質量％） ２．３ ────────────────────[Table 3] Table 3 ──────────────────── Quicklime powder ──────────────────── CaO ( Mass%) 95.3 SiO 2 (mass%) 1.3 Fe 2 O 3 (mass%) 0.7 Al 2 O 3 (mass%) 0.2 Others (mass%) 2.3 ───── ───────────────
【００３２】上記の三種の土壌生石灰混合物の一軸圧縮
強さを、ＪＩＳ−Ａ−１２１６：１９９８に準じて測定
した。その結果を図２に示す。なお、一軸圧縮強さの測
定は、土壌生石灰混合物を調製してから７日経過後と２
８日経過後に行なった。上記の三種の土壌生石灰混合物
のＣＢＲ値をＪＩＳ−Ａ−１２１１：１９９８に準じて
測定した。その結果を図３に示す。The uniaxial compressive strength of the above-mentioned three types of soil quicklime mixtures was measured according to JIS-A-1216: 1998. The result is shown in FIG. The uniaxial compressive strength was measured after 7 days from the time when the soil quicklime mixture was prepared and after 2 days.
It was performed after 8 days. The CBR value of the above-mentioned three types of soil quicklime mixtures was measured according to JIS-A-1211: 1998. The result is shown in FIG.
【００３３】図２及び図３の結果から、本発明の方法に
従って得た汚泥焼却灰は、市販生石灰とほぼ同等の土壌
改良効果があることが分かる。From the results shown in FIGS. 2 and 3, it is understood that the sludge incineration ash obtained according to the method of the present invention has a soil improving effect almost equal to that of commercial quicklime.
【００３４】[0034]
【発明の効果】本発明の汚泥焼却方法によれば、工業的
に安価に入手できる炭酸カルシウム含有粉末を用いなが
らも、土質改良材として有利に用いることができる汚泥
焼却灰を得ることができる。EFFECTS OF THE INVENTION According to the sludge incineration method of the present invention, it is possible to obtain sludge incineration ash that can be advantageously used as a soil improvement agent, while using calcium carbonate-containing powder that is industrially available at low cost.
【図１】本発明の下水汚泥の焼却処理方法に有利に用い
ることができる下水汚泥焼却処理装置の一例の構成図で
ある。FIG. 1 is a configuration diagram of an example of a sewage sludge incineration treatment device that can be advantageously used in the sewage sludge incineration treatment method of the present invention.
【図２】実施例１及び実施例２にて得た汚泥焼却灰を適
用した土壌の一軸圧縮強さの変化を示す図である。FIG. 2 is a diagram showing changes in uniaxial compressive strength of soil to which the sludge incineration ash obtained in Examples 1 and 2 is applied.
【図３】実施例１及び実施例２にて得た汚泥焼却灰を適
用した土壌のＣＢＲ値の変化を示す図である。FIG. 3 is a diagram showing changes in CBR value of soil to which the sludge incineration ash obtained in Example 1 and Example 2 is applied.
１０ 循環流動炉 １１ 燃焼室（ライザー） １２ ホットサイクロン １３ ループシール １４ 混合投入機 １５ 一次ブロワ １６ 一次空気導入口 １７ 二次ブロワ １８ 二次空気導入口 １９ 燃料導入口 ２０ 汚泥焼却灰回収装置 ２１ 焼却灰取出し口 ２２ 排ガスファン 10 Circulating flow furnace 11 Combustion chamber (riser) 12 hot cyclone 13 loop seal 14 Mixing machine 15 Primary blower 16 Primary air inlet 17 Secondary blower 18 Secondary air inlet 19 Fuel inlet 20 Sludge incineration ash recovery system 21 Incinerator ash outlet 22 Exhaust gas fan
───────────────────────────────────────────────────── フロントページの続き (72)発明者 粟田 敬二 千葉県市原市五井南海岸８番の２ 宇部マ テリアルズ株式会社内 Ｆターム(参考） 4D059 AA02 BB01 BB13 BJ00 CC04 CC10 DA03 DA12 DA51 DA56 EB11 EB20 4H026 CA02 CC06 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Keiji Awata 8 Ube Ma, No. 8 Goi Minami Coast, Ichihara City, Chiba Prefecture Inside Terials Co., Ltd. F-term (reference) 4D059 AA02 BB01 BB13 BJ00 CC04 CC10 DA03 DA12 DA51 DA56 EB11 EB20 4H026 CA02 CC06
Claims (8)
もに焼成して、酸化カルシウム含有粉末を含む汚泥焼却
灰を得ることを特徴とする下水汚泥の焼却処理方法。1. A method for incinerating sewage sludge, which comprises firing sewage sludge together with calcium carbonate-containing powder to obtain sludge incineration ash containing calcium oxide-containing powder.
循環流動炉にて焼成する請求項１に記載の下水汚泥の焼
却処理方法。2. The incineration method for sewage sludge according to claim 1, wherein the sewage sludge and the calcium carbonate-containing powder are fired in a circulating fluidized furnace.
ｍｍを超える粒子の含有量が１質量％以下である請求項
１もしくは２に記載の下水汚泥の焼却処理方法。3. The calcium carbonate-containing powder has a particle size of 1
The method for incinerating sewage sludge according to claim 1 or 2, wherein the content of particles exceeding mm is 1% by mass or less.
くは貝殻の粉砕物である請求項１乃至３のうちのいずれ
かの項に記載の下水汚泥の焼却処理方法。4. The incineration treatment method of sewage sludge according to claim 1, wherein the calcium carbonate-containing powder is a crushed product of limestone or shells.
２００質量部の炭酸カルシウム含有粉末を焼成する請求
項１乃至４のうちのいずれかの項に記載の下水汚泥の焼
却処理方法。5. 25 to 25 parts by mass of sewage sludge
The method for incinerating sewage sludge according to any one of claims 1 to 4, wherein 200 parts by mass of calcium carbonate-containing powder is fired.
灰製造用の炭酸カルシウム含有粉末。6. A calcium carbonate-containing powder for producing a sludge incineration ash, which comprises a calcium oxide-containing powder.
１質量％以下であることを特徴とする請求項６に記載の
炭酸カルシウム含有粉末。7. The calcium carbonate-containing powder according to claim 6, wherein the content of particles having a particle diameter of more than 1 mm is 1% by mass or less.
項６もしくは７に記載の炭酸カルシウム含有粉末。8. The calcium carbonate-containing powder according to claim 6, which is a crushed product of limestone or shellfish.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006152150A (en) * | 2004-11-30 | 2006-06-15 | Shimizu Corp | Method for producing ground stabilizer |
| KR102294758B1 (en) * | 2021-04-29 | 2021-08-27 | 주식회사 모두그린 | Manufacturing method for soil conditioner |
| JP2021151642A (en) * | 2020-03-24 | 2021-09-30 | 月島テクノメンテサービス株式会社 | Sewage sludge incineration treatment method and sewage sludge incineration treatment facility |
| CN115337771A (en) * | 2022-08-26 | 2022-11-15 | 同济大学 | Coal-fired coupled sludge incineration power generation method |
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| JPS61271098A (en) * | 1985-05-27 | 1986-12-01 | Babcock Hitachi Kk | Incinerating method for waste water sludge |
| JPH11116290A (en) * | 1997-10-14 | 1999-04-27 | Tokuyama Corp | Production of cement |
| JP2000063829A (en) * | 1998-08-25 | 2000-02-29 | Ube Material Industries Ltd | Highly active, recycled quicklime composition, preparation thereof and use as soil stabilization treatment material |
| JP2002121574A (en) * | 2000-10-13 | 2002-04-26 | Mitsubishi Heavy Ind Ltd | System for producing hydrogen from organic waste |
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|---|---|---|---|---|
| JPS54128476A (en) * | 1978-03-29 | 1979-10-05 | Ebara Infilco Co Ltd | Treating method for waste |
| JPS61271098A (en) * | 1985-05-27 | 1986-12-01 | Babcock Hitachi Kk | Incinerating method for waste water sludge |
| JPH11116290A (en) * | 1997-10-14 | 1999-04-27 | Tokuyama Corp | Production of cement |
| JP2000063829A (en) * | 1998-08-25 | 2000-02-29 | Ube Material Industries Ltd | Highly active, recycled quicklime composition, preparation thereof and use as soil stabilization treatment material |
| JP2002121574A (en) * | 2000-10-13 | 2002-04-26 | Mitsubishi Heavy Ind Ltd | System for producing hydrogen from organic waste |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006152150A (en) * | 2004-11-30 | 2006-06-15 | Shimizu Corp | Method for producing ground stabilizer |
| JP4609701B2 (en) * | 2004-11-30 | 2011-01-12 | 清水建設株式会社 | Method for manufacturing ground improvement material |
| JP2021151642A (en) * | 2020-03-24 | 2021-09-30 | 月島テクノメンテサービス株式会社 | Sewage sludge incineration treatment method and sewage sludge incineration treatment facility |
| KR102294758B1 (en) * | 2021-04-29 | 2021-08-27 | 주식회사 모두그린 | Manufacturing method for soil conditioner |
| CN115337771A (en) * | 2022-08-26 | 2022-11-15 | 同济大学 | Coal-fired coupled sludge incineration power generation method |
| CN115337771B (en) * | 2022-08-26 | 2024-02-27 | 同济大学 | Coal-fired coupled sludge incineration power generation method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3939194B2 (en) | 2007-07-04 |
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