JPS60227897A - Treatment or organic sludge - Google Patents
Treatment or organic sludgeInfo
- Publication number
- JPS60227897A JPS60227897A JP59083839A JP8383984A JPS60227897A JP S60227897 A JPS60227897 A JP S60227897A JP 59083839 A JP59083839 A JP 59083839A JP 8383984 A JP8383984 A JP 8383984A JP S60227897 A JPS60227897 A JP S60227897A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- cake
- dehydrated cake
- dried
- drying
- 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
- 239000010802 sludge Substances 0.000 title claims abstract description 55
- 238000005273 aeration Methods 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 17
- 239000010865 sewage Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000003672 processing method Methods 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 7
- 230000000717 retained effect Effects 0.000 abstract description 6
- 239000004449 solid propellant Substances 0.000 abstract description 5
- 230000018044 dehydration Effects 0.000 description 6
- 238000006297 dehydration reaction Methods 0.000 description 6
- 229920006317 cationic polymer Polymers 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000010800 human waste Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000010893 paper waste Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000013055 pulp slurry Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Gasification And Melting Of Waste (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、し尿、下水その他の有機性汚水の処理に伴っ
て発生する有機性汚泥の省エネルギ的な処理方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an energy-saving method for treating organic sludge generated during the treatment of human waste, sewage, and other organic wastewater.
従来、し尿、下水その他の有機性汚水の処理において発
生する有機性汚泥は、カチオンポリマなどの各種脱水助
剤が添加され、機械脱水されているが、脱水ケーキの含
水率はまだ高く、特に難脱水性の汚泥の場合には脱水ケ
ーキの含水率が８０％台と高いことが多い。したがって
、このような脱水ケーキは、そのままでは処分が困難で
あるために、乾燥、焼却される例が多いが１．その乾燥
、焼却に際しては多量の有価燃料を必要とし、エネルギ
節約の立場から大きな問題となっている。Conventionally, organic sludge generated in the treatment of human waste, sewage, and other organic sewage has been mechanically dehydrated by adding various dehydration aids such as cationic polymers, but the moisture content of the dehydrated cake is still high, making it particularly difficult. In the case of dewaterable sludge, the moisture content of the dehydrated cake is often as high as 80%. Therefore, since it is difficult to dispose of such dehydrated cake as it is, it is often dried and incinerated.1. Drying and incineration require a large amount of valuable fuel, which poses a major problem from the standpoint of energy conservation.
本発明は、有機性汚水処理ｌこ伴って不可避的に発生す
る有機性汚泥の脱水ケーキを乾燥、焼却するにあたり、
重油などの有価燃料を不要とし、処理系内でのエネルギ
を自己充足し得るきわめて省エネルギ的な合理的処理方
法を提供しようとするものである。The present invention provides a method for drying and incinerating the dehydrated cake of organic sludge that inevitably occurs during organic sewage treatment.
The aim is to provide an extremely energy-saving and rational treatment method that does not require valuable fuel such as heavy oil and can be self-sufficient in energy within the treatment system.
本発明は、有機性汚水処理において得られた初沈汚泥を
脱水し、該脱水ケーキを前記有機性汚水処理に使用され
る曝気ブロワの吐出空気によって通気乾燥して乾燥物を
得る一方、前記有機性汚水処理において得られた余剰活
性汚泥を別個に脱水し、該脱水ケーキを乾燥又は焼却す
るに際し前記乾燥物を乾燥又は焼却用熱源として使用す
ることを特徴とするものである。The present invention dehydrates initial settling sludge obtained in organic sewage treatment, and air-dries the dehydrated cake with air discharged from an aeration blower used in the organic sewage treatment to obtain a dry product. The method is characterized in that the surplus activated sludge obtained in the industrial sewage treatment is separately dehydrated, and when the dehydrated cake is dried or incinerated, the dried product is used as a heat source for drying or incineration.
本発明の一実施例を下水処理への適用を例にとって図面
を参照しながら説明すると、下水１は最初沈殿池２に導
かれて沈降しやすい懸濁固形物を沈殿分離したのち、曝
気槽３において曝気を受けて生物処理される。曝気槽３
にて生物処理された下水は、さらに最終沈殿池４におい
て沈殿分離され、得られた汚泥の一部は余剰活性汚泥５
となり、他部は曝気槽３へ返送される返送汚泥６となる
。One embodiment of the present invention will be described with reference to the drawings, taking the application to sewage treatment as an example. Sewage 1 is first led to a settling tank 2, where suspended solids that tend to settle are separated by sedimentation, and then an aeration tank 3 It is aerated and biologically treated. Aeration tank 3
The biologically treated sewage is further separated by sedimentation in the final settling tank 4, and a part of the obtained sludge is used as surplus activated sludge 5.
The other part becomes return sludge 6 which is returned to the aeration tank 3.
従来、余剰活性汚泥５は、最初沈殿池２で沈殿分離され
た初沈汚泥７と混合されて処理されることが多かったが
、本発明では余剰活性汚泥５と初沈汚泥７とを別々に脱
水することが第１の重要点である。Conventionally, the surplus activated sludge 5 was often treated by being mixed with the first settled sludge 7 that was precipitated and separated in the first settling tank 2, but in the present invention, the surplus activated sludge 5 and the first settled sludge 7 are separated separately. Dehydration is the first important point.
すなわち、本発明者の実験によれば、初沈汚泥７をスク
リュープレスなどの脱水機８によって脱水すると、カチ
オンポリマなどの脱水助剤を添加することなく脱水する
ことが可能で、６０〜６５％程度の低含水率の脱水ケー
キ９を得ることができるのに対し、余剰活性汚泥５を初
沈汚泥７に混合すると、もはやスクリュープレスによっ
ても無薬注脱水することがきわめて困難になるという重
要な現象が認められた。That is, according to the inventor's experiments, when the initial settling sludge 7 is dehydrated using a dehydrator 8 such as a screw press, it is possible to dehydrate it without adding a dehydration aid such as a cationic polymer, and the dehydration rate is 60 to 65%. However, when surplus activated sludge 5 is mixed with initial settling sludge 7, it becomes extremely difficult to perform chemical-free dewatering even with a screw press. A phenomenon was observed.
このように、初沈汚泥７を余剰活性汚泥５とは別個に脱
水するが、初沈汚泥７の性状の変動に伴って無薬注脱水
が困難になることもあり得ることを配慮し、初沈汚泥７
に故紙をハイピロパルパーによって解離したパルプスラ
リ、スクリーンかす、あるいはもみがら、おがくずなど
の有機粉体Ａを添加することによって、常に安定した無
薬注脱水を行うことができ、また後述する乾燥物１５の
発熱量も萬くなる。この故紙の添加率としては、初沈汚
泥７中の固形物量に対して２０％（重量％）程度で十分
である。In this way, the initial settling sludge 7 is dehydrated separately from the surplus activated sludge 5, but taking into consideration that chemical-free dewatering may become difficult due to changes in the properties of the initial settling sludge 7, Silted sludge 7
By adding organic powder A such as pulp slurry, screen dregs, rice husks, and sawdust, which are made by dissociating waste paper with a hyperpulper, stable chemical-free dehydration can be performed at all times. The calorific value will also be 10,000. As for the addition rate of this waste paper, it is sufficient to add about 20% (weight %) to the amount of solids in the initial settling sludge 7.
しかして、脱水機８によって無薬注で低含水率に脱水さ
れた初沈汚泥７の脱水ケーキ９は、通気乾燥器１０内に
供給されて充填層１１が形成され、下水の生物処理工程
における前記曝気槽３に曝気用空気を供給する曝気ブロ
ワ１２の吐出空気１３が吹き込まれ、充填層１１内を上
向流で通気し乾燥が行われながら、通気乾燥器１０から
の流出空気１４は曝気槽３に散気され、曝気用空気とし
て利用される。曝気ブロワ９の吐出空気１３は、断熱圧
縮によって７０℃程度の温度となっているから、この保
有熱量によって、含水率の少ない初沈汚泥７の脱水ケー
キ９は重油などの燃料を使用することなく乾燥される。The dehydrated cake 9 of the first settled sludge 7, which has been dehydrated to a low water content without chemical injection by the dehydrator 8, is fed into the ventilation dryer 10 to form a packed bed 11, which is used in the biological treatment process of sewage. The discharge air 13 of the aeration blower 12 that supplies aeration air to the aeration tank 3 is blown into the packed bed 11 in an upward flow for drying, while the outflow air 14 from the aeration dryer 10 is aerated. Air is diffused into tank 3 and used as aeration air. Since the discharge air 13 of the aeration blower 9 has a temperature of about 70°C due to adiabatic compression, this retained heat allows the dehydrated cake 9 of the initial settling sludge 7 with a low moisture content to be produced without using fuel such as heavy oil. dried.
脱水ケーキ９の乾燥に際しては、脱水ケーキ９を押出し
造粒機などによって粒径１０朋程度に造粒したのちに通
気乾燥器ＩＯ内に供給すれば、良好な通気性が確保され
るから有利であり、また通気乾燥器１０内には縦長の例
えば層厚５０〜７０儂の充填層を形成させるのが効果的
である。When drying the dehydrated cake 9, it is advantageous to granulate the dehydrated cake 9 to a particle size of about 10 mm using an extrusion granulator or the like and then feed it into the ventilation dryer IO because good air permeability is ensured. Moreover, it is effective to form a vertically elongated packed layer, for example, with a layer thickness of 50 to 70 degrees, in the ventilation dryer 10.
このように、曝気ブロワ１２の吐出空気１３の保有熱量
によって通気乾燥器１０において含水率１５％未満の乾
燥物１５を得ることができ、この乾燥物１５は低位発熱
ｔ ３５００ Ｋｃａｌ ７ｋｇ 乾燥物の固形燃料と
なり、これが本発明の第２の重要点である。In this way, the dried material 15 having a moisture content of less than 15% can be obtained in the aeration dryer 10 by the retained heat of the discharged air 13 of the aeration blower 12, and this dried material 15 has a lower heat value of t 3500 Kcal 7 kg Dry material solid This is the second important point of the present invention.
なお、余剰活性汚泥５と初沈汚泥７との混合汚泥（混合
生汚泥という）を脱水しようとすれば、如何なる型式の
脱水機でも無薬注脱水はきわめて困難で、得られた脱水
ケーキの含水率が高く、曝気ブロワ１２の吐出空気１３
の保有熱量が乾燥所要熱量に対して著るしく不足し、満
足できる低水分の乾燥物を得ることができないことが確
認された。In addition, if you try to dehydrate mixed sludge (referred to as mixed raw sludge) of excess activated sludge 5 and initial settling sludge 7, it is extremely difficult to dewater without chemical injection using any type of dehydrator, and the resultant dehydrated cake will contain less water. The rate of discharge air 13 of the aeration blower 12 is high.
It was confirmed that the amount of heat retained in the drying process was significantly insufficient compared to the amount of heat required for drying, making it impossible to obtain a dried product with a satisfactory low moisture content.
次に、余剰活性汚泥５は、カチオンポリマ、ＦｅＣｌ３
などの脱水助剤１６の添加を受けて任意の脱水機１７（
ばルトプレス、フィルタプレス、遠心脱水機、スクリュ
ープレスなど）によって脱水され、含水率７０〜８０％
程度の脱水ケーキ１８となる。Next, the surplus activated sludge 5 is made of cationic polymer, FeCl3
Any dehydrator 17 (
Water content is 70-80%.
The result is a dehydrated cake of about 18 degrees.
この場合、カチオンポリマなどの脱水助剤１６の添加は
、余剰活性汚泥５に対してのみ行い、一般的な下水処理
工程の余剰活性汚泥５と初沈汚泥７の発生量の比率は４
：１０であるから、脱水助剤１６の所要量は混合生汚泥
を脱水する場合に比べて約７０％減となり、大きな省資
源効果がある。In this case, the dewatering aid 16 such as a cationic polymer is added only to the surplus activated sludge 5, and the ratio of the amount of surplus activated sludge 5 and initial settling sludge 7 generated in a general sewage treatment process is 4.
:10, the required amount of dewatering aid 16 is reduced by about 70% compared to when dewatering mixed raw sludge, resulting in a large resource saving effect.
さらに、余剰活性汚泥５の脱水ケーキ１８は乾燥又は焼
却炉１９に導かれるが、その乾燥又は焼却用熱源として
前記初沈汚泥７の固形燃料化した乾燥物１５を使用する
ことによって、有価燃料を全く使用することなく乾燥又
は焼却することができ、これが本発明の第３の重要点で
ある。Further, the dehydrated cake 18 of the surplus activated sludge 5 is dried or led to an incinerator 19, and by using the dried product 15 of the initial settling sludge 7 as a solid fuel as a heat source for drying or incineration, valuable fuel can be obtained. It can be dried or incinerated without any use, which is the third key point of the invention.
図中、２０は燃焼用空気を、２１は乾燥又は焼却残渣を
示し、２２は焼却時に発生する焼却生成熱で、スクリュ
ープレス脱水機のスクリュー軸などの加温熱源として、
あるいは通気乾燥器１ｏの補助熱源として有効利用する
のが好適である。In the figure, 20 indicates combustion air, 21 indicates drying or incineration residue, and 22 indicates incineration generated heat generated during incineration, which can be used as a heating heat source such as the screw shaft of a screw press dehydrator.
Alternatively, it is preferable to effectively utilize it as an auxiliary heat source for the ventilation dryer 1o.
以上述べたように、本発明は初沈汚泥を脱水し、その脱
水ケーキを曝気ブロワの吐出空気の保有熱を利用して乾
燥して固形燃料化し、これを余剰活性汚泥の脱水ケーキ
の乾燥又は焼却用の熱源として使用するものであるから
、次のようなきわめて重要なる効果を得ることができる
。As described above, the present invention dewaters the initial settling sludge, dries the dehydrated cake using the retained heat of the discharged air of the aeration blower to form solid fuel, and uses this to dry the dehydrated cake of surplus activated sludge or Since it is used as a heat source for incineration, the following extremely important effects can be obtained.
■ 有機性汚泥を、重油などの有価燃料を使用すること
なく、省エネルギ的に乾燥、焼却処分することができる
。■ Organic sludge can be dried and incinerated in an energy-saving manner without using valuable fuels such as heavy oil.
■ 有機性汚泥に添加すべき脱水助剤の所要量をきわめ
て節減することができる。■ The required amount of dewatering aid to be added to organic sludge can be significantly reduced.
■ 少量かつ低水分の初沈汚泥の脱水ケーキのみをまず
乾燥するから、乾燥所要熱量が少なく、曝気ブロワ吐出
空気の保有熱量によっても十分な乾燥を行え、初沈汚泥
から固形燃料として利用できる乾燥物を得ることができ
、その乾燥器の規模も小さくてよい。■ Since only the dehydrated cake of initial settling sludge with a small amount and low moisture content is dried first, the amount of heat required for drying is small, and sufficient drying can be performed using the retained heat of the air discharged from the aeration blower, making it possible to dry initial settling sludge that can be used as solid fuel. The dryer can be small in size.
図面は本発明の一実施例を示す系統説明図である。
１・・・・・・下水、２・・・・・・最初沈殿池、３・
・・・・・曝気槽、４・・・・・・最終沈殿池、５・・
・・・・余剰活性汚泥、６・・・・・・返送汚泥、７・
・・・・・初沈汚泥、８，１７・・・・・・脱水機、９
．１８・・・・・・脱水ケーキ、１０・・・・・・通気
乾燥器、１１・・・・・・充填層、１２・・・・・・曝
気ブロワ、】３・・団・吐出空気、■４・・・・・・流
出空気、１５・・・・・・乾燥物、１６・・・・・・脱
水助剤、１９・・・・・・乾燥又は焼却炉、２０・・・
・・・燃焼用空気、２１・・・・・・乾燥又は焼却残渣
、２２・・・・・・焼却生成熱。
特許出願人 荏原インフィルコ株式会社代理人 弁理士
高 木 正 行The drawing is a system explanatory diagram showing an embodiment of the present invention. 1...Sewage, 2...First sedimentation basin, 3.
...Aeration tank, 4...Final sedimentation tank, 5...
... Surplus activated sludge, 6 ... Returned sludge, 7.
...First settling sludge, 8,17...Dehydrator, 9
．． 18... Dehydrated cake, 10... Ventilation dryer, 11... Filled bed, 12... Aeration blower, ] 3... Group/discharge air, ■4... Outflow air, 15... Dry material, 16... Dehydration aid, 19... Drying or incinerator, 20...
... Air for combustion, 21 ... Drying or incineration residue, 22 ... Heat produced by incineration. Patent applicant: Ebara Infilco Co., Ltd. Representative Patent attorney: Masayuki Takagi
Claims (1)
し、該脱水ケーキを前記有機性汚水処理に使用される曝
気ブロワの吐出空気によって通気乾燥して乾燥物を得る
一方、前記有機性汚水処理において得られた余剰活性汚
泥を別個に脱水し、該脱水ケーキを乾燥又は焼却するに
際し前記乾燥物を乾燥又は焼却用熱源として使用するこ
とを特徴とする有機性汚泥の処理方法。 ２、前記初沈汚泥の脱水ケーキを造粒したのち前記曝気
ブロワの吐出空気によって通気乾燥するものである特許
請求の範囲第１項記載の有機性汚泥の処理方法。 ３ 前記初沈汚泥の脱水ケーキの通気乾燥に際し、前記
脱水ケーキの充填層を形成するものである特許請求の範
囲第１項又は第２項記載の有機性汚泥の処理方法。[Claims] 1. Dewatering the initial settling sludge obtained in the organic sewage treatment, and drying the dehydrated cake through air discharged from the aeration blower used in the organic sewage treatment to obtain a dried product. On the other hand, the organic sludge is characterized in that the surplus activated sludge obtained in the organic sewage treatment is separately dehydrated, and when the dehydrated cake is dried or incinerated, the dried product is used as a heat source for drying or incineration. Processing method. 2. The method for treating organic sludge according to claim 1, wherein the dehydrated cake of the initial settling sludge is granulated and then dried through ventilation with the air discharged from the aeration blower. 3. The organic sludge treatment method according to claim 1 or 2, wherein a packed bed of the dehydrated cake is formed when the dehydrated cake of the initial settling sludge is aerated and dried.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59083839A JPS60227897A (en) | 1984-04-27 | 1984-04-27 | Treatment or organic sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59083839A JPS60227897A (en) | 1984-04-27 | 1984-04-27 | Treatment or organic sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60227897A true JPS60227897A (en) | 1985-11-13 |
Family
ID=13813868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59083839A Pending JPS60227897A (en) | 1984-04-27 | 1984-04-27 | Treatment or organic sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60227897A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56150499A (en) * | 1980-04-24 | 1981-11-20 | Ebara Infilco Co Ltd | Disposal of sludge |
| JPS596985A (en) * | 1982-07-05 | 1984-01-14 | Kubota Ltd | Treatment of waste water with activated sludge |
-
1984
- 1984-04-27 JP JP59083839A patent/JPS60227897A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56150499A (en) * | 1980-04-24 | 1981-11-20 | Ebara Infilco Co Ltd | Disposal of sludge |
| JPS596985A (en) * | 1982-07-05 | 1984-01-14 | Kubota Ltd | Treatment of waste water with activated sludge |
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