JP2000169269A - Production of molten and solidified material of sludge - Google Patents
Production of molten and solidified material of sludgeInfo
- Publication number
- JP2000169269A JP2000169269A JP10345464A JP34546498A JP2000169269A JP 2000169269 A JP2000169269 A JP 2000169269A JP 10345464 A JP10345464 A JP 10345464A JP 34546498 A JP34546498 A JP 34546498A JP 2000169269 A JP2000169269 A JP 2000169269A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- alkaline earth
- salt
- added
- molten
- 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
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Fertilizers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、生活排水や下水
等の汚水を浄化する際に発生する汚泥中の無機質を有効
に利用し、溶成リン肥として活用することができる、重
金属含有量の低い汚泥溶融固化体を製造する方法に関す
るものである。BACKGROUND OF THE INVENTION The present invention relates to a method for effectively utilizing inorganic substances in sludge generated when purifying sewage such as domestic wastewater and sewage, which can be utilized as a fused phosphorus fertilizer. The present invention relates to a method for producing a low-solidified sludge melt.
【０００２】[0002]
【従来の技術】生活排水や下水等の汚水中から、汚泥を
濃縮、分離、脱水し、得られた脱水汚泥を溶融、固化
し、または、前記脱水汚泥を焼却しその焼却灰を溶融、
固化して得られた汚泥溶融固化体を肥料として有効利用
する研究が進められている。2. Description of the Related Art Sludge is concentrated, separated and dewatered from sewage such as domestic wastewater and sewage, and the obtained dewatered sludge is melted and solidified, or the dewatered sludge is incinerated and its incinerated ash is melted.
Research on the effective use of solidified sludge obtained as a fertilizer has been advanced.
【０００３】このような汚泥溶融固化体の主要成分の７
０％は有機物であり、肥料として効果のある窒素および
燐酸の含有量は各々約５％、カリウムの含有量は約０．
３％に過ぎない。従って、肥料としての効果に乏しく、
そのままでは、肥料というよりも、土質改良のための堆
肥の代替として使用される程度であってその需要は少な
い。[0003] The main component of such a sludge melt-solidified material, 7
0% is organic matter, the contents of nitrogen and phosphoric acid effective as a fertilizer are about 5%, and the content of potassium is about 0.1%.
Only 3%. Therefore, the effect as fertilizer is poor,
As it is, it is used as a substitute for compost for soil improvement rather than fertilizer, and its demand is small.
【０００４】そこで、本発明者は、上述した問題を解決
し、生活排水や下水等から分離したスラリー状汚泥を原
料として、リン酸質肥料として有効な溶成リン肥とな
る、付加価値の高い汚泥溶融固化体を経済的に製造する
ことができる方法を開発すべく研究を重ねた。Therefore, the present inventor has solved the above-mentioned problems and has made a high value-added, highly effective dissolved phosphorus fertilizer as a phosphate fertilizer using slurry sludge separated from domestic wastewater and sewage as a raw material. Research was conducted to develop a method for economically producing sludge melt solidification.
【０００５】その結果、特開平９−３２８３８４号公報
に開示されているように、スラリ−状汚泥を濃縮および
脱水し、脱水した汚泥を溶融し次いで冷却固化するか、
または、前記脱水した汚泥を焼却し、その焼却灰を溶融
し次いで冷却固化するに際し、溶融前の前記脱水汚泥ま
たは前記汚泥焼却灰に、CaO, MgOおよび／またはその塩
を、溶融固化体の成分として、CaO,MgO 等のアルカリ土
類のアルカリ成分が４０％以上、く溶性苦土が１２％以
上となるように添加し、更に、リン酸および／またはそ
の塩を、溶融固化体の成分として、く溶性リン酸が１７
％以上となるように添加し、これらを混合した混合物を
１３５０℃以上の温度で溶融し次いで冷却固化すること
により、溶成リン肥としての汚泥溶融固化体を製造する
方法を開発した（以下、先行技術という）。As a result, as disclosed in JP-A-9-328384, the slurry-like sludge is concentrated and dewatered, and the dewatered sludge is melted and then cooled and solidified.
Alternatively, when the dewatered sludge is incinerated, and the incinerated ash is melted and then cooled and solidified, CaO, MgO and / or a salt thereof are added to the dehydrated sludge or the sludge incinerated ash before melting, as a component of the molten solidified material. As an alkaline earth component such as CaO, MgO, etc., in an amount of 40% or more and a soluble insoluble magnesium in an amount of 12% or more. Further, phosphoric acid and / or a salt thereof is added as a component of the molten solid. , 17 soluble phosphoric acid
%, And a mixture of these was melted at a temperature of 1350 ° C. or more, and then cooled and solidified to develop a method for producing a sludge melt-solidified product as a fused phosphorus fertilizer (hereinafter, referred to as “melted phosphorus fertilizer”). Prior art).
【０００６】先行技術によれば、生活排水や下水等から
分離したスラリー状汚泥を原料とし、リン酸質肥料とし
て有効な溶成リン肥となる付加価値の高い汚泥溶融固化
体を経済的に製造することができ、従来廃棄処分されて
いたスラリー状汚泥を、溶成リン肥として有効活用する
ことができる。[0006] According to the prior art, high-value-added sludge-solidified solidified material that becomes a dissolved phosphorus fertilizer effective as a phosphate fertilizer is produced economically from slurry sludge separated from domestic wastewater or sewage. The slurry-like sludge that has been conventionally disposed of can be effectively used as dissolved phosphorus fertilizer.
【０００７】[0007]
【発明が解決しようとする課題】表１に示すように、先
行技術によって製造された汚泥溶融固化体の主成分は、
市販の溶成リン肥の主成分と大差がなく、肥料取締り法
の規格、土壌環境基準などには合格している。As shown in Table 1, the main components of the sludge melt-solidified body produced according to the prior art are:
There is no major difference from the main components of commercially available fused phosphorus fertilizer, and it has passed the standards of the Fertilizer Control Law and the soil environmental standards.
【０００８】[0008]
【表１】 [Table 1]
【０００９】しかしながら、先行技術によって製造され
た汚泥溶融固化体中には、表２にその一例を示すよう
に、少量ながら、Ｃｕ、Ｐｂ、Ｚｎ等の重金属類が含有
されており、このような重金属類の含有量は、同じく表
２に示す市販の溶成リン肥の重金属類含有量に比べて多
い。このように、市販溶成リン肥に比べて重金属類含有
量が多いことは、汚泥無機質の有効利用の観点からは不
利な条件になり、溶成リン肥として肥料取締り法の規
格、土壌環境基準などには合格していても、環境衛生上
の観点から、その使用が見送られるおそれが生ずる。However, as shown in Table 2, small amounts of heavy metals such as Cu, Pb, and Zn are contained in the molten and solidified sludge produced by the prior art. The heavy metal content is higher than the heavy metal content of the commercially available fused phosphorus fertilizer also shown in Table 2. As described above, the fact that the content of heavy metals is higher than that of commercially available fused phosphorus fertilizers is a disadvantageous condition from the viewpoint of effective utilization of sludge minerals. Even if it passes, there is a risk that its use will be forgotten from the viewpoint of environmental hygiene.
【００１０】[0010]
【表２】 [Table 2]
【００１１】従って、この発明の目的は、上述した問題
を解決し、生活排水や下水等から分離したスラリー状汚
泥を原料として、リン酸質肥料として有効な溶成リン肥
となる、重金属類の含有量が少ない汚泥溶融固化体を、
経済的に製造することができる方法を提供することにあ
る。[0011] Accordingly, an object of the present invention is to solve the above-mentioned problems, and to use heavy metal sludges, which are effective as phosphate fertilizers, using slurry sludge separated from domestic wastewater or sewage as a raw material. Sludge melt solidified with low content,
It is to provide a method that can be manufactured economically.
【００１２】[0012]
【課題を解決するための手段】請求項１に記載の発明
は、生活排水、下水等の汚水を浄化する際に発生するス
ラリー状汚泥を濃縮および脱水し、脱水した汚泥を溶融
し次いで冷却固化するか、または、前記脱水した汚泥を
焼却し、その焼却灰を溶融し次いで冷却固化するに際
し、溶融前の脱水汚泥または汚泥焼却灰に、ＣａＯ、Ｍ
ｇＯおよび／またはその塩を、溶融固化体の成分とし
て、ＣａＯ、ＭｇＯ等のアルカリ土類のアルカリ成分が
４０％以上、く溶性苦土が１２％以上となるように、そ
して、リン酸および／またはその塩を、溶融固化体の成
分として、く溶性リン酸が１７％以上となるようにそれ
ぞれ添加し、更に、脱水汚泥または汚泥焼却灰中に含有
されている重金属の含有量に対して、重金属がすべて塩
化物に変換された場合の塩素のモル等量以上のアルカリ
および／またはアルカリ土類の塩化物を添加し、そし
て、これらを混合し、この混合物を１３５０℃以上の温
度で、酸素の存在下で溶融し次いで冷却固化することに
より、溶成リン肥としての、重金属含有率が低い汚泥溶
融固化体を製造することに特徴を有するものである。According to the first aspect of the present invention, a slurry-like sludge generated when purifying sewage such as domestic wastewater or sewage is concentrated and dewatered, the dewatered sludge is melted, and then cooled and solidified. Alternatively, when the dewatered sludge is incinerated, and the incinerated ash is melted and then solidified by cooling, CaO, M is added to the dehydrated sludge or the sludge incinerated ash before melting.
gO and / or a salt thereof are used as components of the molten solid so that the alkaline component of alkaline earth such as CaO and MgO becomes 40% or more, the soluble magnesia becomes 12% or more, and phosphoric acid and / or Alternatively, a salt thereof is added as a component of the molten solid so that the soluble phosphoric acid becomes 17% or more, and further, with respect to the content of heavy metal contained in dehydrated sludge or sludge incineration ash, Add alkali and / or alkaline earth chlorides at least molar equivalents of chlorine when all heavy metals have been converted to chlorides and mix them; Is characterized in that a molten sludge having a low heavy metal content is produced as a fused phosphorus fertilizer by melting in the presence of and then solidifying by cooling.
【００１３】請求項２に記載の発明は、前記アルカリお
よび／またはアルカリ土類の塩化物として、塩化カルシ
ウムおよび／または塩化マグネシウムを使用することに
特徴を有するものである。The invention according to claim 2 is characterized in that calcium chloride and / or magnesium chloride are used as the alkali and / or alkaline earth chloride.
【００１４】請求項３に記載の発明は、汚泥を焼却する
際に炉から発生した飛灰を、排ガスの流速を利用して一
定粒径の粗粒と微粉とに分級し、微粉の飛灰に対し、前
記一定量のＣａＯ、ＭｇＯおよび／またはその塩と、リ
ン酸および／またはその塩と、そして、飛灰中に含有さ
れている重金属の含有量に対して、重金属類がすべて塩
化物に変換された場合の塩素のモル等量以上のアルカリ
および／またはアルカリ土類の塩化物を添加混合するこ
とに特徴を有するものである。According to a third aspect of the present invention, fly ash generated from a furnace during incineration of sludge is classified into coarse particles and fine powder having a constant particle size by utilizing the flow rate of exhaust gas, and fly ash of fine powder is obtained. On the other hand, with respect to the above-mentioned fixed amount of CaO, MgO and / or a salt thereof, phosphoric acid and / or a salt thereof, and heavy metal contained in fly ash, all heavy metals are chlorides. Is characterized by adding and mixing an alkali and / or alkaline earth chloride in an amount equal to or greater than the molar equivalent of chlorine when converted to.
【００１５】この発明によれば、脱水汚泥または汚泥焼
却灰に、一定量のＣａＯ、ＭｇＯおよび／またはその塩
と、リン酸および／またはその塩と、そして、飛灰中に
含有されている重金属の含有量に対して、重金属類がす
べて塩化物に変換された場合の塩素のモル等量以上のア
ルカリおよび／またはアルカリ土類の塩化物を添加混合
し、この混合物を溶融固化することによって、重金属類
の含有量が少ない汚泥溶融固化体を経済的に製造するこ
とができる。According to the present invention, a certain amount of CaO, MgO and / or a salt thereof, phosphoric acid and / or a salt thereof, and heavy metals contained in fly ash are added to dehydrated sludge or sludge incineration ash. By adding and mixing alkali and / or alkaline earth chlorides in an amount equal to or greater than the molar equivalent of chlorine when all heavy metals are converted to chlorides with respect to the content of, and melting and solidifying the mixture, It is possible to economically produce a sludge molten solidified material having a low content of heavy metals.
【００１６】[0016]
【発明の実施の形態】溶成リン肥は、酸性土壌の多い日
本の農業事情に適したリン酸質質料として、広く使用さ
れており、このような溶成リン肥は、従来、輸入リン鉱
石に蛇紋岩などの原料を混合し、電気炉や平炉などで融
解し、水砕し、粉砕することによって製造されている。BEST MODE FOR CARRYING OUT THE INVENTION The solubilized phosphorus fertilizer is widely used as a phosphate material suitable for the agricultural situation in Japan having many acidic soils. It is manufactured by mixing raw materials such as serpentine, melting in an electric furnace or open hearth, granulating and pulverizing.
【００１７】溶成リン肥の成分は、肥料取締法によっ
て、く溶性燐酸１７％以上、アルカリ分４０％以上、く
溶性苦土１２％以上と定められており、表１に示すよう
に、市販の溶成リン肥の成分組成は、これを満足してい
る。The components of the fused phosphorus fertilizer are determined by the Fertilizer Control Law to be 17% or more soluble phosphoric acid, 40% or more alkali, and 12% or more soluble magnesia. The component composition of the fused phosphorus fertilizer satisfies this.
【００１８】一方、下水汚泥焼却灰および下水汚泥溶融
スラグの成分組成は、例えば表３に示す通りで、これを
表１に示した市販の溶成リン肥の成分組成と対比すれば
明らかなように、下水汚泥焼却灰および下水汚泥溶融ス
ラグには、溶成リン肥の必須成分である P2 O 5 が多量
に含有されている。しかしながら、下水汚泥焼却灰およ
び下水汚泥溶融スラグには、アルカリ分即ちＣａＯとＭ
ｇＯの合計量、および、く溶性苦土即ちＭｇＯ の含有
量が少ない。On the other hand, the component compositions of the sewage sludge incineration ash and the sewage sludge molten slag are, for example, as shown in Table 3, and are apparent from comparison with the component compositions of commercially available fused phosphorus fertilizer shown in Table 1. In addition, sewage sludge incineration ash and sewage sludge molten slag contain a large amount of P 2 O 5 , an essential component of dissolved phosphorus fertilizer. However, sewage sludge incineration ash and sewage sludge molten slag contain alkali components, that is, CaO and M
The total amount of gO and the content of soluble gauze or MgO are small.
【００１９】[0019]
【表３】 [Table 3]
【００２０】そこで、スラリー状汚泥を濃縮および脱水
し、脱水した汚泥を溶融し次いで冷却固化するか、また
は、脱水した汚泥を焼却し、その焼却灰を溶融し次いで
冷却固化する際に、溶融前の脱水汚泥または汚泥焼却灰
に、ＣａＯ、ＭｇＯおよび／またはその塩を、溶融固化
体の成分としてＣａＯ、ＭｇＯ 等のアルカリ土類のア
ルカリ成分が４０％以上、く溶性苦土が１２％以上とな
るように添加し、リン酸および／またはその塩を、溶融
固化体の成分として、く溶性リン酸が１７％以上となる
ように添加し、その成分を調整する。Therefore, the slurry sludge is concentrated and dewatered, and the dewatered sludge is melted and solidified by cooling. Alternatively, when the dewatered sludge is incinerated and the incinerated ash is melted and then solidified by cooling, The dewatered sludge or sludge incineration ash contains CaO, MgO and / or a salt thereof, containing 40% or more of alkaline components of alkaline earth such as CaO and MgO as components of a molten and solidified body and 12% or more of soluble magnesia. Phosphoric acid and / or a salt thereof is added as a component of the molten solid so that the soluble phosphoric acid is 17% or more, and the components are adjusted.
【００２１】この発明においては、上記ＣａＯ、ＭｇＯ
および／またはその塩と上記リン酸および／またはその
塩に加え、脱水汚泥または、汚泥焼却灰中に含有されて
いる重金属の含有量に対して、重金属類がすべて塩化物
に変換された場合の塩素のモル等量以上のアルカリおよ
び／またはアルカリ土類の塩化物を添加し、これらを十
分に混合する。次いで、この混合物を、電気炉や平炉な
どで１３５０℃以上の温度で、酸素の存在下で溶融した
後、冷却固化し次いで所定粒度に粉砕する。かくして、
重金属類の含有量が少ない、溶成リン肥としての汚泥溶
融固化体が製造される。In the present invention, the above CaO, MgO
And / or in addition to the salt thereof and the phosphoric acid and / or the salt thereof, relative to the content of the heavy metal contained in the dehydrated sludge or the sludge incineration ash, when all the heavy metals are converted to chlorides. Add alkali and / or alkaline earth chlorides at least molar equivalents of chlorine and mix them well. Next, the mixture is melted in an electric furnace or open hearth at a temperature of 1350 ° C. or more in the presence of oxygen, solidified by cooling, and then pulverized to a predetermined particle size. Thus,
A sludge melt solidified as a fused phosphorus fertilizer having a low content of heavy metals is produced.
【００２２】アルカリおよび／またはアルカリ土類の塩
化物としては、塩化カルシウムおよび／または塩化マグ
ネシウムが使用される。このようなアルカリおよび／ま
たはアルカリ土類の塩化物の添加量は、重金属類がすべ
て塩化物に変換された場合の塩素の少なくともモル等量
以上、例えばモル等量の２〜５倍であることが必要であ
る。As the alkali and / or alkaline earth chloride, calcium chloride and / or magnesium chloride are used. The amount of such an alkali and / or alkaline earth chloride to be added is at least a molar equivalent or more, for example, 2 to 5 times the molar equivalent of chlorine when all heavy metals are converted to chlorides. is necessary.
【００２３】上述した重金属類を塩化物に変換するため
に添加する塩化カルシウムおよび／または塩化マグネシ
ウムは、前述した脱水汚泥または汚泥焼却灰に溶成リン
肥として不足するアルカリ分およびく溶性苦土を補うた
めに添加するＣａＯ、ＭｇＯおよび／またはその塩の一
部として代替することができる。The above-mentioned calcium chloride and / or magnesium chloride added to convert heavy metals into chlorides can reduce alkali content and soluble magnesia which are insufficient as dissolved phosphorus fertilizer in the above-mentioned dehydrated sludge or sludge incineration ash. It can be replaced as part of CaO, MgO and / or its salt added to supplement.
【００２４】上述した混合物の溶融は、酸素の存在下で
１３５０℃以上の温度で行うことが必要である。溶融を
酸素の存在下で行わないと、汚泥焼却灰中の鉄イオンと
反応し不純物が生成する問題が生ずる。The melting of the above mixture must be performed at a temperature of 1350 ° C. or more in the presence of oxygen. If the melting is not carried out in the presence of oxygen, there is a problem that it reacts with iron ions in the sludge incineration ash and generates impurities.
【００２５】なお、ＣａＯ、ＭｇＯ等のアルカリ土類の
アルカリ成分４０％以上、く溶性苦土１２％以上となる
ように添加混合するＣａＯ、ＭｇＯおよび／またはその
塩の材料として、製鉄所等で発生するマグネシア系耐火
物の廃材、ドロマイト系耐火物の廃材および転炉滓を利
用し、また、上述したく溶性リン酸が１７％以上となる
ように添加混合するリン酸および／またはその塩の材料
として、金属の表面処理等に使用した廃リン酸または廃
リン酸塩を利用することができる。In addition, as a material of CaO, MgO and / or a salt thereof, which is added and mixed so that an alkaline component of alkaline earth such as CaO, MgO or the like becomes 40% or more and 12% or more of soluble magnesia, it is used in an iron mill or the like. Utilizing the generated magnesia-based refractory waste material, dolomite-based refractory waste material and converter slag, and adding and mixing phosphoric acid and / or a salt thereof so that the soluble phosphoric acid is 17% or more. As the material, waste phosphoric acid or waste phosphate used for metal surface treatment or the like can be used.
【００２６】硫酸滓、低品位鉱、銅転炉滓中の有価金属
を回収し、残さは製鉄原料として利用するために、上記
硫酸滓等にアルカリ土類やアルカリ土類の塩化物を加
え、８００℃以上の高温で酸素の存在下でばい焼する方
法が昭和３０年代に研究開発されており、このばい焼の
場合の反応率は、温度に依存することが明らかにされて
いる。例えば、アルカリ土類としてＣａＣｌ2 を使用す
るときは、その融点が７７２℃なので、８００℃以上の
温度で金属の揮散反応が進行する。これに対し、下水汚
泥の灰分中の重金属は、殆どが塩化物ではないので、こ
れを単に溶融温度まで加熱しても重金属は揮散し難い。In order to collect valuable metals in the sulfuric acid slag, low-grade ore, and copper converter slag, and to use the residue as a raw material for ironmaking, add alkaline earth or alkaline earth chloride to the above sulfuric acid slag, etc. A method of roasting at a high temperature of 800 ° C. or more in the presence of oxygen was researched and developed in the 1930s, and it has been revealed that the reaction rate in this roasting depends on the temperature. For example, when CaCl 2 is used as the alkaline earth, the melting point of the metal is 772 ° C., so that the metal volatilization reaction proceeds at a temperature of 800 ° C. or more. On the other hand, most of the heavy metals in the ash of the sewage sludge are not chlorides. Therefore, even if the heavy metals are simply heated to the melting temperature, the heavy metals hardly volatilize.
【００２７】表３に示した成分組成の、下記（１）に示
す重金属類を含有する下水汚泥焼却灰を使用し、この発
明の方法によって重金属類を揮散させる試験を行った。
試験は、焼却灰とＣａＣｌ2 の混合物とを石英ボードに
入れ、この石英ボードを電気炉により酸化雰囲気中で、
８００〜１２００℃の温度で６０分間加熱処理すること
によって行った。焼却灰中の重金属含有量、ＣａＣｌ2
の添加量および重金属であるＰｂの揮散量を下記に示
す。Using a sewage sludge incineration ash containing the heavy metals shown in the following (1) having the component composition shown in Table 3, a test was conducted to volatilize the heavy metals by the method of the present invention.
In the test, the incineration ash and the mixture of CaCl 2 were placed in a quartz board, and the quartz board was placed in an oxidizing atmosphere using an electric furnace.
The heat treatment was performed at a temperature of 800 to 1200 ° C. for 60 minutes. Heavy metal content in incineration ash, CaCl 2
And the amount of volatilization of heavy metal Pb are shown below.
【００２８】（１）焼却灰中の重金属含有量： Ｃｕ：１０００ｍｇ／ｋｇ、 Ｐｂ： ２４０ｍｇ／ｋｇ、 Ｚｎ：２７００ｍｇ／ｋｇ、 Ｃｄ： ＜１０ｍｇ／ｋｇ （２）ＣａＣｌ2 の添加量： ＣａＣｌ2 換算モル当量 ： ６ｇｒ／ｋｇ、 ＣａＣｌ2 換算５倍モル当量：３０ｇｒ／ｋｇ （３）Ｐｂ揮散量： 加熱温度 ８００℃： ９４ｍｇ／ｋｇ、 加熱温度 １０００℃： ４１ｍｇ／ｋｇ、 加熱温度 １２００℃：＜１０ｍｇ／ｋｇ 上記から明らかなように、１２００℃の温度で加熱溶融
することにより、Ｐｂ含有量を、当初の２４０ｍｇ／ｋ
ｇから１０ｍｇ／ｋｇ以下にまで減少させることができ
た。(1) Heavy metal content in incinerated ash: Cu: 1000 mg / kg, Pb: 240 mg / kg, Zn: 2700 mg / kg, Cd: <10 mg / kg (2) CaCl 2 added: CaCl 2 conversion Molar equivalent: 6 gr / kg, 5 times molar equivalent in terms of CaCl 2 : 30 gr / kg (3) Pb volatilization amount: heating temperature 800 ° C .: 94 mg / kg, heating temperature 1000 ° C .: 41 mg / kg, heating temperature 1200 ° C .: <10 mg As is clear from the above, by heating and melting at a temperature of 1200 ° C., the Pb content was reduced to 240 mg / k at the initial stage.
g to less than 10 mg / kg.
【００２９】下水汚泥を焼却する際に炉から発生する飛
灰を捕集し、その成分を調整して溶成リン肥を製造する
に際し、飛灰の量や成分は大幅に変動することから、こ
のよな飛灰の量や成分の変動に拘わらず、その成分調整
を安定して行い得るようにすることが必要である。When the fly ash generated from the furnace during incineration of the sewage sludge is collected and its components are adjusted to produce the fused phosphorus fertilizer, the amount and the components of the fly ash fluctuate greatly. It is necessary to stably adjust the components irrespective of such fluctuations in the amount and components of fly ash.
【００３０】そこで、下水汚泥を焼却する際に炉から発
生した飛灰を、排ガスの流速を利用し、その部分分級効
率が７５％となる限界粒径を５〜２０μｍの範囲内に設
定して粗粒と微粉とに分級し、微粉の飛灰に対し、上述
した一定量のＣａＯ、ＭｇＯおよび／またはその塩と、
リン酸および／またはその塩と、そして、飛灰中に含有
されている重金属の含有量に対して、重金属類がすべて
塩化物に変換された場合の塩素のモル等量以上のアルカ
リおよび／またはアルカリ土類の塩化物を添加混合し、
これを酸素の存在下で溶融すれば、飛灰の量や成分の変
動に拘わらず、重金属類の含有量が少ない溶成リン肥と
しての汚泥溶融固化体を安定して製造することができ
る。Therefore, fly ash generated from the furnace during incineration of sewage sludge is used to set the critical particle size at which the partial classification efficiency becomes 75% within the range of 5 to 20 μm using the flow rate of the exhaust gas. Classified into coarse particles and fine powder, and with respect to fly ash of fine powder, a certain amount of CaO, MgO and / or a salt thereof described above,
With respect to the content of phosphoric acid and / or a salt thereof and heavy metals contained in fly ash, alkali and / or at least a molar equivalent of chlorine when all heavy metals are converted to chlorides Add and mix alkaline earth chlorides,
If this is melted in the presence of oxygen, it is possible to stably produce a sludge-solidified body as a fused phosphorus fertilizer having a low content of heavy metals, regardless of the amount of fly ash and the fluctuation of components.
【００３１】[0031]
【実施例】次に、この発明を実施例により説明する。表
３に示した成分組成の、上記（１）に示す重金属類を含
有する下水汚泥焼却灰とリン酸マグネシウムと石灰石と
ケイ酸とを、表４（Ａ）に示す基本割合で配合し汚泥溶
融固化体を製造するに際し、表４（Ｂ）に示す配合割合
のように、石灰石の一部を塩化カルシウムに変更した
上、これらを十分に混合し、次いで、上記混合物を電気
炉において酸化雰囲気中で１４００℃の温度で１時間加
熱溶融した後、溶融物を水中に投入して急冷することに
より溶融汚泥固化体を製造した。Next, the present invention will be described with reference to embodiments. The sewage sludge incineration ash containing the heavy metals shown in the above (1), magnesium phosphate, limestone, and silicic acid having the component composition shown in Table 3 were blended in the basic ratio shown in Table 4 (A) to melt the sludge. In producing the solidified body, a part of the limestone was changed to calcium chloride as shown in the mixing ratio shown in Table 4 (B), and these were sufficiently mixed. Then, the mixture was placed in an electric furnace in an oxidizing atmosphere. After heating and melting at a temperature of 1400 ° C. for 1 hour, the melt was put into water and rapidly cooled to produce a solidified molten sludge.
【００３２】[0032]
【表４】 [Table 4]
【００３３】得られた溶融汚泥固化体の重金属含有量は
下記の通りであり、市販溶リンの重金属含有量よりも少
なかった。 Ｃｕ： １８ｍｇ／ｋｇ、 Ｐｂ：＜１０ｍｇ／ｋｇ、 Ｚｎ： ７０ｍｇ／ｋｇ、 Ｃｄ：＜１０ｍｇ／ｋｇThe heavy metal content of the obtained solidified molten sludge was as follows, and was lower than the heavy metal content of the commercially available molten phosphorus. Cu: 18 mg / kg, Pb: <10 mg / kg, Zn: 70 mg / kg, Cd: <10 mg / kg
【００３４】[0034]
【発明の効果】以上述べたように、この発明によれば、
生活排水や下水等から分離したスラリー状汚泥を原料と
して、重金属の含有量が少なく、リン酸質肥料として有
効な溶成リン肥となる、重金属類の含有量が少ない付加
価値の高い汚泥溶融固化体を、経済的に製造することが
できる、工業上有用な効果がもたらされる。As described above, according to the present invention,
Slurry sludge separated from domestic wastewater and sewage, etc. is used as raw material, and has a low content of heavy metals, and becomes an effective dissolved phosphorus fertilizer as a phosphate fertilizer. There is an industrially useful effect that the body can be manufactured economically.
Claims (3)
発生するスラリー状汚泥を濃縮および脱水し、脱水した
汚泥を溶融し次いで冷却固化するか、または、前記脱水
した汚泥を焼却し、その焼却灰を溶融し次いで冷却固化
するに際し、 溶融前の前記脱水汚泥または前記汚泥焼却灰に、Ｃａ
Ｏ、ＭｇＯおよび／またはその塩を、溶融固化体の成分
として、ＣａＯ、ＭｇＯ 等のアルカリ土類のアルカリ
成分が４０％以上、く溶性苦土が１２％以上となるよう
に、そして、リン酸および／またはその塩を、溶融固化
体の成分として、く溶性リン酸が１７％以上となるよう
にそれぞれ添加し、更に、前記脱水汚泥または前記汚泥
焼却灰中に含有されている重金属の含有量に対して、前
記重金属がすべて塩化物に変換された場合の塩素のモル
等量以上のアルカリおよび／またはアルカリ土類の塩化
物を添加し、そして、これらを混合し、 この混合物を１３５０℃以上の温度で、酸素の存在下で
溶融し次いで冷却固化することにより、溶成リン肥とし
ての、重金属含有率が低い汚泥溶融固化体を製造するこ
とを特徴とする、汚泥溶融固化体の製造方法。Claims: 1. Slurry sludge generated when purifying sewage such as domestic wastewater or sewage is concentrated and dewatered, and the dewatered sludge is melted and solidified by cooling, or the dewatered sludge is incinerated, When the incinerated ash is melted and then cooled and solidified, Ca is added to the dehydrated sludge or the sludge incinerated ash before melting.
O, MgO and / or a salt thereof is used as a component of the molten solid so that the alkaline component of alkaline earth such as CaO and MgO becomes 40% or more, the soluble magnesia becomes 12% or more, and phosphoric acid is added. And / or a salt thereof is added as a component of the molten solid so that the soluble phosphoric acid becomes 17% or more, and further, the content of heavy metal contained in the dehydrated sludge or the sludge incineration ash , An alkali and / or alkaline earth chloride in an amount equal to or greater than the molar equivalent of chlorine when all of the heavy metals are converted to chlorides, and mixing them. A molten sludge having a low heavy metal content as a fused phosphorus fertilizer by melting and then solidifying by cooling in the presence of oxygen at a temperature of Manufacturing method.
類の塩化物として、塩化カルシウムおよび／または塩化
マグネシウムを使用する、請求項１に記載の方法。2. The method according to claim 1, wherein calcium chloride and / or magnesium chloride are used as the alkali and / or alkaline earth chloride.
を、排ガスの流速を利用して一定粒径の粗粒と微粉とに
分級し、微粉の飛灰に対し、前記一定量のＣａＯ、Ｍｇ
Ｏおよび／またはその塩と、リン酸および／またはその
塩と、そして、飛灰中に含有されている重金属の含有量
に対して、重金属類がすべて塩化物に変換された場合の
塩素のモル等量以上のアルカリおよび／またはアルカリ
土類の塩化物を添加混合する、請求項１または２に記載
の方法。3. The fly ash generated from a furnace when incinerating sludge is classified into coarse particles and fine powder having a constant particle size by using the flow rate of exhaust gas. CaO, Mg
With respect to the content of O and / or its salt, phosphoric acid and / or its salt, and the heavy metal contained in fly ash, the mole of chlorine when all the heavy metals are converted to chloride The method according to claim 1 or 2, wherein an equal amount or more of alkali and / or alkaline earth chloride is added and mixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10345464A JP2000169269A (en) | 1998-12-04 | 1998-12-04 | Production of molten and solidified material of sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10345464A JP2000169269A (en) | 1998-12-04 | 1998-12-04 | Production of molten and solidified material of sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000169269A true JP2000169269A (en) | 2000-06-20 |
Family
ID=18376781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10345464A Pending JP2000169269A (en) | 1998-12-04 | 1998-12-04 | Production of molten and solidified material of sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000169269A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003146784A (en) * | 2001-11-07 | 2003-05-21 | Nkk Corp | Method of manufacturing melt solidified body |
| JP2004511345A (en) * | 2000-10-17 | 2004-04-15 | ソルヴェイ | How to deactivate sludge |
| WO2005123629A1 (en) * | 2004-06-21 | 2005-12-29 | Sanki Engineering Co., Ltd. | Method and apparatus for producing phosphate fertilizer utilizing incineration ash |
| WO2006072982A1 (en) * | 2005-01-06 | 2006-07-13 | Sanki Engineering Co., Ltd | Process for producing phosphatic fertilizer and apparatus therefor |
| DE10217956B4 (en) * | 2002-07-18 | 2008-04-17 | Joachim Mallon | Process for phosphorus recovery |
| WO2013002250A1 (en) * | 2011-06-27 | 2013-01-03 | 太平洋セメント株式会社 | Phosphate fertilizer, and method for producing phosphate fertilizer |
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| JP2013237588A (en) * | 2012-05-15 | 2013-11-28 | Taiheiyo Cement Corp | Phosphate fertilizer and method for producing the same |
| JP2013253000A (en) * | 2012-06-07 | 2013-12-19 | Taiheiyo Cement Corp | Method for producing phosphate fertilizer |
| JP2014001095A (en) * | 2012-06-18 | 2014-01-09 | Taiheiyo Cement Corp | Production method of silicic acid-phosphoric acid fertilizer and silicic acid-phosphoric acid fertilizer |
| CN106904804A (en) * | 2017-03-30 | 2017-06-30 | 哈尔滨工业大学 | In the method that saponin(e and magnesium chloride remove Heavy Metals in Sludge as detergent |
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-
1998
- 1998-12-04 JP JP10345464A patent/JP2000169269A/en active Pending
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|---|---|---|---|---|
| JP2004511345A (en) * | 2000-10-17 | 2004-04-15 | ソルヴェイ | How to deactivate sludge |
| JP2003146784A (en) * | 2001-11-07 | 2003-05-21 | Nkk Corp | Method of manufacturing melt solidified body |
| DE10217956B4 (en) * | 2002-07-18 | 2008-04-17 | Joachim Mallon | Process for phosphorus recovery |
| WO2005123629A1 (en) * | 2004-06-21 | 2005-12-29 | Sanki Engineering Co., Ltd. | Method and apparatus for producing phosphate fertilizer utilizing incineration ash |
| JP2006001819A (en) * | 2004-06-21 | 2006-01-05 | Tokyo Metropolis | Method and apparatus for manufacturing phosphorus fertilizer using incineration ash |
| WO2006072982A1 (en) * | 2005-01-06 | 2006-07-13 | Sanki Engineering Co., Ltd | Process for producing phosphatic fertilizer and apparatus therefor |
| WO2013002250A1 (en) * | 2011-06-27 | 2013-01-03 | 太平洋セメント株式会社 | Phosphate fertilizer, and method for producing phosphate fertilizer |
| JP2013032269A (en) * | 2011-06-27 | 2013-02-14 | Taiheiyo Cement Corp | Phosphate fertilizer and method for producing the same |
| CN103649016B (en) * | 2011-06-27 | 2015-09-23 | 太平洋水泥株式会社 | The manufacture method of phosphatic manure and phosphatic manure |
| CN103649016A (en) * | 2011-06-27 | 2014-03-19 | 太平洋水泥株式会社 | Phosphate fertilizer, and method for producing phosphate fertilizer |
| JP2013086981A (en) * | 2011-10-13 | 2013-05-13 | Taiheiyo Cement Corp | System and method for producing phosphatic fertilizer |
| JP2013237588A (en) * | 2012-05-15 | 2013-11-28 | Taiheiyo Cement Corp | Phosphate fertilizer and method for producing the same |
| JP2013253000A (en) * | 2012-06-07 | 2013-12-19 | Taiheiyo Cement Corp | Method for producing phosphate fertilizer |
| JP2014001095A (en) * | 2012-06-18 | 2014-01-09 | Taiheiyo Cement Corp | Production method of silicic acid-phosphoric acid fertilizer and silicic acid-phosphoric acid fertilizer |
| CN103058485A (en) * | 2012-12-24 | 2013-04-24 | 华南农业大学 | Method of achieving synchronization of municipal sludge desiccation and nutrient utilization |
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