JP4596768B2 - Method of manufacturing cement raw material from sewage sludge using carbide - Google Patents
Method of manufacturing cement raw material from sewage sludge using carbide Download PDFInfo
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- JP4596768B2 JP4596768B2 JP2003413869A JP2003413869A JP4596768B2 JP 4596768 B2 JP4596768 B2 JP 4596768B2 JP 2003413869 A JP2003413869 A JP 2003413869A JP 2003413869 A JP2003413869 A JP 2003413869A JP 4596768 B2 JP4596768 B2 JP 4596768B2
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Description
本発明は、炭化物を利用した下水汚泥のセメント資源化設備の高効率化方法、詳しくは、ごみ、ごみ固形燃料（ＲＤＦ）、汚泥などを炭化して製造した炭化物を利用して下水汚泥からセメント原料を低いランニングコストで製造することができる方法に関するものである。なお、ＲＤＦはｒｅｆｕｓｅ ｄｅｒｉｖｅｄ ｆｕｅｌの略で、ごみを乾燥、固形化、成形して得られたごみ固形燃料を言う。 The present invention relates to a method for improving the efficiency of sewage sludge cement recycling equipment using carbides, and more specifically, cement from sewage sludge using carbides produced by carbonizing garbage, refuse solid fuel (RDF), sludge, etc. The present invention relates to a method capable of producing a raw material at a low running cost. Note that RDF is an abbreviation for “fused derived fuel”, which is a solid waste fuel obtained by drying, solidifying, and molding waste.
従来、下水汚泥からのセメント製造用原料の製造方法として、下水汚泥を脱水・乾燥して乾燥汚泥とし、この乾燥汚泥に生石灰を混合して乾燥粉体とする下水汚泥からのセメント製造用原料の製造方法において、乾燥汚泥の含水率を常時自動的に測定し、その測定値に基づいて乾燥汚泥に添加する生石灰の量を自動調整するようにした構成が知られている（例えば、特許文献１参照）。
解決しようとする問題点は、上記特許文献１におけるような方法では、生石灰のセメント原料化設備から製造した乾粉には、生石灰として約４４％、消石灰として約５８％含まれ、このため、生石灰を購入しなければならない上、本来場外に搬出する量は、実際の搬出量の約半分であり、ランニングコストが嵩むという点にある。 The problem to be solved is that, in the method as described in Patent Document 1, the dry powder produced from the facility for converting raw lime into cement raw material contains about 44% as quick lime and about 58% as slaked lime. In addition to having to purchase, the amount to be carried out of the field is about half of the actual amount carried out, and the running cost is increased.
本発明は、下水汚泥のセメント資源化設備におけるランニングコストの低減を図るために、炭化物をセメント資源化設備を有する下水処理場内に受け入れ、下水汚泥のセメント資源化設備の上流に位置する脱水機にて、炭化物を脱水助剤として使用することを最も主要な特徴とする。なお、脱水助剤効果による乾燥負荷の低減分は、生石灰の使用量の削減にて調整する。 In order to reduce the running cost in a sewage sludge cement recycling facility, the present invention accepts a carbide in a sewage treatment plant having a cement recycling facility, and a dehydrator located upstream of the sewage sludge cement recycling facility. The main feature is the use of carbide as a dehydrating aid. The reduction in drying load due to the dehydration aid effect is adjusted by reducing the amount of quicklime used.
また、本発明の方法においては、炭化物の添加により、脱水汚泥の発生量が３〜２０％程度削減することができるとともに、脱水汚泥の含有水分が少なくなるので、セメント資源化設備の中の、乾燥機又は／及び熟成機で、蒸気発生炉の燃料、例えば灯油又は／及び生石灰などの使用量を削減することができる。また、下水処理場は、炭化物の受入れによる収入を得ることができ、燃料（例えば、灯油）又は／及び薬剤の使用量低減によりランニングコストを低減することができる。 Moreover, in the method of the present invention, the amount of dehydrated sludge generated can be reduced by about 3 to 20% by adding carbide, and the water content of the dehydrated sludge is reduced. In the dryer or / and the aging machine, the amount of fuel used in the steam generator, such as kerosene or / and quicklime, can be reduced. In addition, the sewage treatment plant can obtain income from receiving the carbide, and can reduce the running cost by reducing the amount of fuel (for example, kerosene) and / or chemicals used.
本発明の炭化物を利用して下水汚泥からセメント原料を製造する方法は、下水を処理するための排水・汚泥処理設備からの濃縮汚泥を脱水機に導入し脱水処理して脱水汚泥とした後、この脱水汚泥を乾燥機に導入して乾燥させ、ついで、乾燥汚泥を生石灰とともに熟成機に導入し熟成させてセメント原料とするセメント原料の製造方法において、前記濃縮汚泥を炭化物とともに脱水機に導入して、炭化物を脱水助剤として使用することを特徴としている。 The method of producing cement raw material from sewage sludge using the carbide of the present invention, after introducing the concentrated sludge from the drainage / sludge treatment facility for treating sewage into a dehydrator and dewatering it into dehydrated sludge, This dehydrated sludge is introduced into a dryer and dried, and then the dried sludge is introduced into a aging machine together with quick lime and aged to be used as a cement raw material. The use of carbide as a dehydrating aid is characterized by the above.
本発明は上記のように構成されているので、つぎのような効果を奏する。
（１） 下水汚泥のセメント資源化設備における生石灰の使用量を削減することができる。試算では約３１％削減することができる。また、場外に搬出するセメント原料の量は変わらない。これらのことから、下水汚泥のセメント資源化設備におけるランニングコストを大幅に低減することができる。
（２） 炭化物の添加により、シリカ分が増加するが、これはセメント原料となる成分であるので問題はない。また、炭化物の処分費用を徴収できる場合は、経済的な利点がより大きくなる。
Since this invention is comprised as mentioned above, there exist the following effects.
(1) The amount of quicklime used in cement recycling facilities for sewage sludge can be reduced. It is possible to reduce about 31% by trial calculation. Moreover, the amount of cement raw material carried out of the field does not change. From these things, the running cost in the cement resource conversion equipment of sewage sludge can be reduced significantly.
(2) Addition of carbide increases the silica content, but this is not a problem because it is a component used as a cement raw material. In addition, if the disposal cost of carbide can be collected, the economic advantage will be greater.
下水汚泥のセメント資源化設備におけるランニングコストの低減を図るという目的を、下水汚泥のセメント資源化設備の上流に位置する脱水機に、濃縮汚泥と炭化物とを供給し、炭化物を脱水助剤として使用することにより実現した。 Concentrated sludge and carbide are supplied to the dehydrator located upstream of the sewage sludge cement recycling facility, and the carbide is used as a dehydrating aid, with the aim of reducing running costs in the sewage sludge cement recycling facility. It was realized by doing.
以下、本発明の実施の形態について説明するが、本発明は下記の実施の形態に何ら限定されるものではなく、適宜変更して実施できるものである。図１は、本発明の実施の第１形態による炭化物を利用して下水汚泥からセメント原料を製造する方法を実施する装置を示している。１０は下水処理場で、この下水処理場１０内にセメント資源化設備１２が設置されている。１４は下水を処理するための排水・汚泥処理設備、１６は脱水機（例えば、ベルトプレス式脱水機、スクリュープレス式脱水機、遠心式脱水機、ロータリープレス式脱水機、フィルタープレス式脱水機、多重円板式脱水機）、１８は乾燥機（例えば、蒸気間接加熱式乾燥機）、２０は熟成機（例えば、一軸パドル式混合機又は二軸パドル式混合機）である。 Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications. FIG. 1 shows an apparatus for carrying out a method for producing a cement raw material from sewage sludge using carbide according to the first embodiment of the present invention. Reference numeral 10 denotes a sewage treatment plant, and a cement recycling facility 12 is installed in the sewage treatment plant 10. 14 is a wastewater / sludge treatment facility for treating sewage, 16 is a dehydrator (for example, belt press dehydrator, screw press dehydrator, centrifugal dehydrator, rotary press dehydrator, filter press dehydrator, (Multiple disk type dehydrator), 18 is a dryer (for example, a steam indirect heating type dryer), and 20 is an aging machine (for example, a single screw paddle type mixer or a twin screw paddle type mixer).
上記のように構成された装置において、下水を処理するための排水・汚泥処理設備１４からの濃縮汚泥を脱水機１６に導入し脱水処理して脱水汚泥とした後、この脱水汚泥を乾燥機１８に導入して水蒸気により間接的に乾燥させ、ついで、乾燥汚泥を生石灰とともに熟成機２０に導入し、生石灰が消石灰に変化するときの反応熱を利用して水分を蒸発させるとともに熟成させてセメント原料を製造する。このセメント原料の製造方法において、濃縮汚泥を炭化物とともに脱水機１６に導入して、炭化物を脱水助剤として使用する。炭化物はごみ、ごみ固形燃料（ＲＤＦ）、汚泥などを炭化して製造したものである。この炭化物は下水処理場１０外から供給されるが、下水処理場内に、炭化物製造装置を設けることも可能である。 In the apparatus configured as described above, after the concentrated sludge from the drainage / sludge treatment facility 14 for treating sewage is introduced into the dehydrator 16 and dehydrated to obtain dehydrated sludge, the dehydrated sludge is dried into the dryer 18. And then dried indirectly with steam, and then the dried sludge is introduced into the aging machine 20 together with quick lime to evaporate and age the moisture using the reaction heat when quick lime changes to slaked lime. Manufacturing. In this cement raw material manufacturing method, the concentrated sludge is introduced into the dehydrator 16 together with carbides, and the carbides are used as a dehydrating aid. The carbide is produced by carbonizing waste, solid waste fuel (RDF), sludge, and the like. Although this carbide is supplied from outside the sewage treatment plant 10, it is also possible to provide a carbide production device in the sewage treatment plant.
つぎに、乾燥機１８及び熟成機２０での物質収支を算出した。図２は炭化物を用いない従来のケース、例えば、前述の特許文献１に示す方法による物質収支を示し、図３は本発明の方法による炭化物を用いるケースを示している。乾燥機１８としては蒸気間接加熱式ツインディスクドライヤを用い、熟成機２０としては一軸パドル式混合機を用いた。なお、熱量＃１は０℃基準の保持熱量を示す。
試算条件としては、次の通りである。脱水助剤効果により、脱水汚泥の水分量が少なくなる。このため、熟成機での汚泥の乾燥に必要な生石灰量を低減できる。さらに、生石灰量使用量低減のために、搬出するカンプン（乾粉）の量は変わらないとする。
また、本来の汚泥固形物量は同じであるが、脱水助剤効果により、炭化物の添加分と同じ重さの水分を余分に脱水できる。乾燥機の熱負荷はほぼ変わらないとするという条件で、熟成機での生石灰使用量低減量を調査した。
Next, the mass balance in the dryer 18 and the aging machine 20 was calculated. FIG. 2 shows a conventional case in which no carbide is used, for example, the mass balance by the method shown in the above-mentioned Patent Document 1, and FIG. 3 shows a case in which carbide by the method of the present invention is used. A steam indirect heating twin disk dryer was used as the dryer 18, and a uniaxial paddle type mixer was used as the aging machine 20. The amount of heat # 1 indicates the amount of heat retained on a 0 ° C. basis.
The trial calculation conditions are as follows. Due to the effect of the dehydration aid, the water content of the dewatered sludge is reduced. For this reason, the amount of quicklime required for drying of the sludge with an aging machine can be reduced. Furthermore, in order to reduce the amount of quicklime used, it is assumed that the amount of dry (dry powder) to be carried out does not change.
Moreover, although the original amount of sludge solids is the same, the moisture of the same weight as the added amount of carbide can be dehydrated by the effect of the dehydration aid. The amount of quicklime used in the aging machine was investigated under the condition that the heat load of the dryer was almost unchanged.
この結果、図２の従来例では生石灰必要量は９．６t ／d であるが、図３の本発明の場合では生石灰必要量は６．６t ／d となり、生石灰必要量は約３１％削減できる。なお、カンプン（乾粉）発生量はどちらも２２．０t ／d で変わらないものとした。 As a result, in the conventional example of FIG. 2, the quicklime requirement is 9.6 t / d, but in the case of the present invention in FIG. 3, the quicklime requirement is 6.6 t / d, and the quicklime requirement can be reduced by about 31%. . The amount of dry (dry powder) generated was 22.0 t / d and was not changed.
つきに、カンプン（乾粉）に関して考察する。乾燥状態での各成分含有率について、汚泥、炭化物、石灰の組成についてまとめると表１のようになる。 In the end, I will consider about the dry powder. Table 1 summarizes the composition of sludge, carbide, and lime for each component content in the dry state.
また、各ケースでのカンプン（乾粉）の成分を比較し、カンプンの評価を行うと表２のようになる。なお、水分のほとんどは、生石灰が変化した消石灰中に同伴する。 Moreover, when the components of the camp (dry powder) in each case are compared and the camp is evaluated, Table 2 is obtained. In addition, most of the water is accompanied by slaked lime in which quick lime has changed.
さらに、各ケースでのカンプン（乾粉）の灰分について評価する。セメント製造時にカンプン中に含まれる有機分は燃焼してしまい、残った灰分がセメントそのものとなる。表３は従来ケースのカンプンの灰分について示し、表４は本発明ケースのカンプンの灰分について示している。 In addition, the ash content of dry powder in each case is evaluated. The organic component contained in the camp is burned during cement production, and the remaining ash becomes the cement itself. Table 3 shows the ash content in the conventional case, and Table 4 shows the ash content in the case of the present invention.
１０ 下水処理場
１２ セメント資源化設備
１４ 排水・汚泥処理設備
１６ 脱水機
１８ 乾燥機
２０ 熟成機
10 Sewage Treatment Plant 12 Cement Resource Recycling Equipment 14 Wastewater / Sludge Treatment Equipment 16 Dehydrator 18 Dryer 20 Aging Machine
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| Application Number | Priority Date | Filing Date | Title |
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| JP2003413869A JP4596768B2 (en) | 2003-12-11 | 2003-12-11 | Method of manufacturing cement raw material from sewage sludge using carbide |
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| JP2003413869A JP4596768B2 (en) | 2003-12-11 | 2003-12-11 | Method of manufacturing cement raw material from sewage sludge using carbide |
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| JP2005170748A JP2005170748A (en) | 2005-06-30 |
| JP2005170748A5 JP2005170748A5 (en) | 2007-01-18 |
| JP4596768B2 true JP4596768B2 (en) | 2010-12-15 |
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| JP5040175B2 (en) * | 2006-05-24 | 2012-10-03 | 株式会社Ｉｈｉ | Method and apparatus for producing mixed fuel of sludge and waste carbide |
| CN101823825B (en) * | 2010-05-27 | 2011-12-07 | 湖南科技大学 | Sludge dehydrating and drying process method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10291000A (en) * | 1997-04-18 | 1998-11-04 | Hitachi Zosen Corp | Treatment of sludge slurry and use of sludge slurry |
| JPH1135351A (en) * | 1997-07-18 | 1999-02-09 | Ebara Corp | Production of cement producing raw material from sewage sludge |
| JP2001137898A (en) * | 1999-11-12 | 2001-05-22 | Hitachi Techno Eng Co Ltd | Method for sludge dehydration |
| JP2001219178A (en) * | 2000-02-10 | 2001-08-14 | Kawasaki Heavy Ind Ltd | Phosphorus removing method using carbide of organic waste |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10291000A (en) * | 1997-04-18 | 1998-11-04 | Hitachi Zosen Corp | Treatment of sludge slurry and use of sludge slurry |
| JPH1135351A (en) * | 1997-07-18 | 1999-02-09 | Ebara Corp | Production of cement producing raw material from sewage sludge |
| JP2001137898A (en) * | 1999-11-12 | 2001-05-22 | Hitachi Techno Eng Co Ltd | Method for sludge dehydration |
| JP2001219178A (en) * | 2000-02-10 | 2001-08-14 | Kawasaki Heavy Ind Ltd | Phosphorus removing method using carbide of organic waste |
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