JPH0218159B2 - - Google Patents
Info
- Publication number
- JPH0218159B2 JPH0218159B2 JP59120833A JP12083384A JPH0218159B2 JP H0218159 B2 JPH0218159 B2 JP H0218159B2 JP 59120833 A JP59120833 A JP 59120833A JP 12083384 A JP12083384 A JP 12083384A JP H0218159 B2 JPH0218159 B2 JP H0218159B2
- Authority
- JP
- Japan
- Prior art keywords
- drying
- dried
- dehydrated
- organic sludge
- air
- 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.)
- Expired - Lifetime
Links
- 238000001035 drying Methods 0.000 claims description 25
- 239000010802 sludge Substances 0.000 claims description 21
- 238000005273 aeration Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 9
- 239000010865 sewage Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000005469 granulation Methods 0.000 claims description 5
- 230000003179 granulation Effects 0.000 claims description 5
- 235000012970 cakes Nutrition 0.000 description 15
- 239000000463 material Substances 0.000 description 6
- 239000010800 human waste Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 229920006317 cationic polymer Polymers 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 235000021463 dry cake Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000004449 solid propellant Substances 0.000 description 2
- 238000007605 air drying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Gasification And Melting Of Waste (AREA)
- Drying Of Solid Materials (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Treatment Of Sludge (AREA)
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
理に伴つて発生する有機性汚泥の省エネルギ的な
乾燥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 drying 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、機械脱水されたの
ち、その脱水ケーキを埋立処分、焼却処分、乾燥
肥料化等によつて処分されている。とくに、有機
性汚泥の有効利用という立場から、乾燥肥料化す
る例が増加してきているが、脱水ケーキの乾燥に
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つている。
Conventionally, organic sludge generated in the treatment of human waste, sewage, and other organic wastewater is treated with various dehydration aids such as cationic polymers, mechanically dehydrated, and then the dehydrated cake is disposed of in a landfill, incinerated, or dried as fertilizer. It has been disposed of by oxidation, etc. In particular, from the viewpoint of effective use of organic sludge, the use of dried fertilizer is increasing, but drying the dehydrated cake requires a large amount of valuable fuel, which is a big problem from the standpoint of energy conservation.
本発明は、有機性汚水処理に伴つて不可避的に
発生する有機性汚泥の脱水ケーキを乾燥するにあ
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
ギ的な乾燥方法を提供するものである。
The present invention eliminates the need for valuable fuels such as heavy oil when drying the dehydrated cake of organic sludge that is inevitably generated in organic sewage treatment, and is extremely energy-saving, as the treatment system is self-sufficient in energy. The present invention provides a drying method.
本発明は、有機性汚水処理において発生した有
機性汚泥の脱水ケーキを乾燥し、該乾燥物の一部
と有機性汚水処理において回収した脱水し渣を混
合し、該混合物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つて通気乾燥したの
ち焼却し、その焼却熱を前記脱水ケーキの乾燥に
利用することを特徴とする有機性汚泥の乾燥方法
である。
The present invention dries a dehydrated cake of organic sludge generated in organic sewage treatment, mixes a part of the dried product with the dehydrated residue collected in the organic sewage treatment, and uses the mixture in the organic sewage treatment. This is a method for drying organic sludge, which is characterized in that the organic sludge is aerated and dried using the air discharged from an aeration blower used for drying the organic sludge, and then incinerated, and the heat of the incineration is used for drying the dehydrated cake.
本発明の一実施例をし尿処理への適用を例にと
つて図面を参照しながら説明すると、し尿の生物
処理工程（図示せず）から発生した余剰汚泥１
は、カチオンポリマなどの脱水助剤などが添加さ
れたのち、例えばベルトプレス脱水機２で脱水さ
れ、含水率80％程度の脱水ケーキ３となり、さら
にこの脱水ケーキ３は熱風乾燥器４に導かれて含
水率40％以下にまで乾燥されて乾燥ケーキ５とな
り、肥料などとして有効利用される。
One embodiment of the present invention will be explained with reference to the drawings, taking as an example the application to human waste treatment.
After adding a dehydration aid such as a cationic polymer, it is dehydrated using, for example, a belt press dehydrator 2 to form a dehydrated cake 3 with a water content of about 80%, and this dehydrated cake 3 is further led to a hot air dryer 4. It is dried to a moisture content of 40% or less to form a dry cake 5, which is effectively used as fertilizer.
一方、バキユームカーから搬入されたし尿から
微細目スクリーン（図示せず）によつて除渣、回
収されたし渣６は、スクリユープレス脱水機７に
よつて脱水され、含水率60％以下にまで脱水され
た脱水し渣８となる。この場合、し渣６は紙など
の繊維分が主体であるから、スクリユープレス７
で容易に60％以下の低含水率にまで脱水できる。 On the other hand, the sludge 6, which was carried in from the vacuum car and was removed and collected by a fine mesh screen (not shown), is dehydrated by a screw press dehydrator 7 until the water content reaches 60% or less. The dehydrated residue 8 is obtained. In this case, since the residue 6 is mainly composed of fibers such as paper, the screw press 7
It can be easily dehydrated to a low water content of 60% or less.
次に、前記余剰汚泥１の乾燥ケーキ５の一部と
脱水し渣８の両者を混合し、その混合物９を密閉
容器１０に供給して充填層９′を形成させ、し尿
の生物処理工程に曝気用空気を供給する曝気ブロ
ワ１１の吐出空気１２の吹き込みによつて、混合
物９は通気乾燥され、乾燥物１３となる。 Next, a part of the dried cake 5 of the excess sludge 1 and the dehydrated residue 8 are mixed, and the mixture 9 is supplied to a closed container 10 to form a packed bed 9', which is used in the biological treatment process of human waste. By blowing discharge air 12 from an aeration blower 11 that supplies aeration air, the mixture 9 is aerated and dried to become a dried product 13.
密閉容器１０にて乾燥ケーキ５の一部と脱水し
渣８の混合物９を曝気ブロワ１１の吐出空気１２
によつて通気乾燥するには、図示のような縦長の
充填層９′を形成させるのが効果的である。すな
わち、乾燥ケーキ５の一部と脱水し渣８の混合物
９の含水率は40〜60％であるため、べとつきがな
く、しかも脱水し渣８は繊維分が主体であるた
め、高い厚さの充填層９′を形成しても被乾燥物
相互の付着、瘉着がなく、良好な通気性が確保さ
れる。しかも、圧密性が非常に少ないので、充填
層９′の底部での被乾燥物の瘉着がないという重
要効果もあり、充填層９′の厚さを高く設定でき
る。 A mixture 9 of a part of the dried cake 5 and the dehydrated residue 8 is transferred to the air 12 discharged from the aeration blower 11 in a closed container 10.
For drying through ventilation, it is effective to form a vertically elongated packed layer 9' as shown in the figure. In other words, the moisture content of the mixture 9 of a part of the dried cake 5 and the dehydrated residue 8 is 40 to 60%, so it is not sticky, and since the dehydrated residue 8 is mainly composed of fibers, it can be used in a high thickness. Even if the packed layer 9' is formed, the objects to be dried do not adhere to each other or stick to each other, and good air permeability is ensured. Moreover, since the compaction property is very low, there is also the important effect that the material to be dried does not stick to the bottom of the packed bed 9', and the thickness of the packed bed 9' can be set high.
この結果、曝気ブロワ１１の吐出空気１２と被
乾燥物との接触時間を長くとることができ、効率
的な乾燥を行うことができる。なお、曝気ブロワ
１１の吐出空気１２は、空気の断熱圧縮熱によつ
て少なくとも60℃程度に昇温しているが、乾燥用
の空気としてはきわめて低い温度をもつにすぎな
い。しかし、このような少量の保有熱量によつて
も、前述したように良好な通気性の確保、高
い充填層厚の確保、被乾燥物の保有水分量の少
なさ、の３条件が満足されるので、効果的な乾燥
が行われ、含水率10％以下にまで乾燥されること
が認められた。 As a result, the contact time between the discharged air 12 of the aeration blower 11 and the object to be dried can be increased, and efficient drying can be performed. Note that the temperature of the air 12 discharged from the aeration blower 11 is raised to at least about 60° C. due to the heat of adiabatic compression of the air, but the temperature is only extremely low for drying air. However, even with such a small amount of retained heat, the three conditions described above are satisfied: ensuring good air permeability, ensuring a high packed layer thickness, and maintaining a small amount of moisture in the dried material. Therefore, it was confirmed that effective drying was carried out and the moisture content was reduced to less than 10%.
このようにして、密閉容器１０において含水率
10％以下にまで乾燥された乾燥物１３は、低位発
熱量3500〜4000kcal／Kgという固形燃料としての
性質をもつており、その一部を他の熱源として利
用してもよいが、この乾燥物を燃料として焼却炉
１４に供給し、その燃焼生成ガス１５の保有熱量
を前述の脱水ケーキ３を乾燥する熱風乾燥器４の
乾燥用熱源として供給する。このようにして各乾
燥に必要な乾燥用のエネルギを自己充足させるこ
とができ、重油などの有価燃料は一切不要にな
る。 In this way, the water content in the closed container 10 is
The dried material 13, which has been dried to 10% or less, has properties as a solid fuel with a lower calorific value of 3,500 to 4,000 kcal/Kg, and a part of it may be used as another heat source, but this dried material is supplied to the incinerator 14 as fuel, and the heat capacity of the combustion generated gas 15 is supplied as a drying heat source to the hot air dryer 4 for drying the dehydrated cake 3 described above. In this way, the drying energy required for each drying process can be self-sufficient, and no valuable fuel such as heavy oil is required.
図中、１６は焼却炉１４への燃焼用空気、１７
は残渣で、１８は熱風乾燥器４から流出する乾燥
排ガスであり、１９は密閉容器１０から流出する
曝気用空気であつて、図示しないし尿の生物処理
工程の曝気槽に供給される。 In the figure, 16 is combustion air to the incinerator 14, 17
is a residue, 18 is dry exhaust gas flowing out from the hot air dryer 4, and 19 is aeration air flowing out from the closed container 10, which is supplied to an aeration tank (not shown) in a biological treatment process for human waste.
さらに、脱水ケーキ３の熱風乾燥器４として、
本発明を実施するうえで最も好適な乾燥機の型式
は、造粒と乾燥を同時に行う造粒乾燥機である。
その理由は、密閉容器１０中での通気乾燥に供給
されるものが粒状の乾燥ケーキ５と脱水し渣８と
なるので、さらに通気性が向上するからである。
また、造粒乾燥機にはいくつかのタイプがある
が、機械撹拌流動層内に温風を下部から吹き込む
タイプが本発明の実施にとつて最も適している。 Furthermore, as a hot air dryer 4 for the dehydrated cake 3,
The most suitable type of dryer for carrying out the present invention is a granulation dryer that simultaneously performs granulation and drying.
The reason is that what is supplied to the air-drying in the airtight container 10 becomes the granular dry cake 5 and the dehydrated residue 8, which further improves the air permeability.
Although there are several types of granulation dryers, the type that blows warm air into a mechanically stirred fluidized bed from below is most suitable for carrying out the present invention.
以上述べたように本発明によれば、次に列記す
るようなきわめて有益なる効果を認めることがで
きるものである。
As described above, according to the present invention, extremely beneficial effects as listed below can be realized.
有機性汚泥の乾燥に、該汚泥の一部と脱水し
渣を効果的に固形燃料化して利用するので、汚
泥乾燥用のエネルギを自己充足することができ
る。 In drying organic sludge, a part of the sludge and the dewatered residue are effectively converted into solid fuel and used, so the energy for drying the sludge can be self-sufficient.
汚水から除去回収したし渣を機械脱水して得
た脱水し渣を乾燥した脱水ケーキに混合し、曝
気ブロワの吐出空気で通気乾燥するので、通気
乾燥時に層厚の厚い充填層を形成しても、被乾
燥物の瘉着、圧密がなく、良好な通気条件を確
保することができ、熱容量としては大きなもの
とはいえない曝気ブロワの吐出空気の保有熱量
を効率よく回収することができる。 The dehydrated residue obtained by mechanically dehydrating the residue removed and collected from the waste water is mixed with the dried dehydrated cake and dried through ventilation with the discharge air of the aeration blower, so that a thick packed layer is formed during ventilation drying. Also, there is no clogging or compaction of the material to be dried, good ventilation conditions can be ensured, and the heat capacity of the air discharged from the aeration blower, which cannot be said to have a large heat capacity, can be efficiently recovered.
図面は本発明の一実施例を示す系統説明図であ
る。
１……余剰汚泥、２……ベルトプレス脱水機、
３……脱水ケーキ、４……熱風乾燥器、５……乾
燥ケーキ、６……し渣、７……スクリユープレス
脱水機、８……脱水し渣、９……混合物、９′…
…充填層、１０……密閉容器、１１……曝気ブロ
ワ、１２……吐出空気、１３……乾燥物、１４…
…焼却炉、１５……生成ガス、１６……燃焼用空
気、１７……残渣、１８……乾燥排ガス、１９…
…曝気用空気。
The drawing is a system explanatory diagram showing an embodiment of the present invention. 1... Surplus sludge, 2... Belt press dehydrator,
3...Dehydrated cake, 4...Hot air dryer, 5...Dried cake, 6...Residue, 7...Screw press dehydrator, 8...Dehydrated residue, 9...Mixture, 9'...
...Filled bed, 10... Sealed container, 11... Aeration blower, 12... Discharge air, 13... Dry material, 14...
... Incinerator, 15 ... Produced gas, 16 ... Combustion air, 17 ... Residue, 18 ... Dry exhaust gas, 19 ...
...Air for aeration.
Claims (1)
の脱水ケーキを乾燥し、該乾燥物の一部と有機性
汚水処理において回収した脱水し渣を混合し、該
混合物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つて通気乾燥したのち焼却
し、その焼却熱を前記脱水ケーキの乾燥に利用す
ることを特徴とする有機性汚泥の乾燥方法。 ２ 前記脱水ケーキの乾燥を造粒と乾燥を同時に
行う造粒乾燥たらしめたものである特許請求の範
囲第１項記載の有機性汚泥の乾燥方法。 ３ 前記混合物の通気乾燥に際し、前記混合物の
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乾燥方法。[Scope of Claims] 1. A dehydrated cake of organic sludge generated in organic sewage treatment is dried, a part of the dried product is mixed with a dehydrated residue recovered in organic sewage treatment, and the mixture is added to the organic sludge. 1. A method for drying organic sludge, which comprises aerating and drying the organic sludge with air discharged from an aeration blower used for industrial sewage treatment, incinerating the organic sludge, and using the heat of the incineration to dry the dehydrated cake. 2. The method for drying organic sludge according to claim 1, wherein the dehydrated cake is dried by granulation drying in which granulation and drying are performed simultaneously. 3. Claim 1, which forms a packed layer of the mixture when the mixture is air-dried.
2. The method for drying organic sludge according to item 2 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59120833A JPS61499A (en) | 1984-06-14 | 1984-06-14 | Method for drying organic sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59120833A JPS61499A (en) | 1984-06-14 | 1984-06-14 | Method for drying organic sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61499A JPS61499A (en) | 1986-01-06 |
| JPH0218159B2 true JPH0218159B2 (en) | 1990-04-24 |
Family
ID=14796089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59120833A Granted JPS61499A (en) | 1984-06-14 | 1984-06-14 | Method for drying organic sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61499A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4568322B2 (en) * | 2006-12-01 | 2010-10-27 | 石川 大輔 | Treatment method of activated surplus sludge |
-
1984
- 1984-06-14 JP JP59120833A patent/JPS61499A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61499A (en) | 1986-01-06 |
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