JPS6022996A - Process for treating sludge - Google Patents
Process for treating sludgeInfo
- Publication number
- JPS6022996A JPS6022996A JP58129929A JP12992983A JPS6022996A JP S6022996 A JPS6022996 A JP S6022996A JP 58129929 A JP58129929 A JP 58129929A JP 12992983 A JP12992983 A JP 12992983A JP S6022996 A JPS6022996 A JP S6022996A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- heat
- digestion
- digestion tank
- treated
- 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
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Landscapes
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は汚泥処理方法に関する。[Detailed description of the invention] The present invention relates to a sludge treatment method.
沈殿池から取り出された生汚泥を汚泥処理する場合に、
従来はこの生汚泥を消化槽内で消化させ、これにより生
じた脱水汚泥を脱水処理させるのが一般的である。とこ
ろで１通常前記生汚泥は、最初沈殿池から取り出された
後に濃縮された初沈濃縮汚泥と、余剰濃縮汚泥や高次処
理濃縮汚泥等の難脱水性濃縮汚泥とからなり、従来は両
者を混合させた状態で消化処理している。しかし、一般
に初沈濃縮汚泥は消化効率が良好であるのに反して。When treating raw sludge taken out from a settling tank,
Conventionally, this raw sludge is generally digested in a digestion tank, and the resulting dewatered sludge is dehydrated. By the way, 1. The above-mentioned raw sludge usually consists of primary settled thickened sludge that is concentrated after being taken out from the initial settling tank, and difficult-to-dewater thickened sludge such as excess thickened sludge or higher-level treated thickened sludge, and conventionally, the two are mixed. Digestion is carried out in this state. However, in general, primary sedimentation thickened sludge has good digestion efficiency.
難脱水性濃縮汚泥は消化効率が悪いという特性を有して
いる。したがって、上記従来のものでは、汚泥全体の消
化効率は必ずしも満足できるものではないという問題が
ある〇
そこで本発明は、消化槽における消化効率の向上を図る
ことを目的とするものである。Difficult to dewater thickened sludge has a characteristic of poor digestion efficiency. Therefore, the conventional method described above has a problem in that the efficiency of digestion of the entire sludge is not necessarily satisfactory. Therefore, the present invention aims to improve the efficiency of digestion in a digestion tank.
この目的を達成するため本発明は、被処理汚泥を初沈濃
縮汚泥と難脱水性濃縮汚泥とに分離し。In order to achieve this object, the present invention separates sludge to be treated into initial settled thickened sludge and hard-to-dewater thickened sludge.
前記難脱水性濃縮汚泥を反応缶で熱処理させ、熱処理後
の熱処理汚泥を前記初沈汚泥とともに消化槽で消化させ
るものである。The difficult-to-dewater concentrated sludge is heat-treated in a reaction tank, and the heat-treated sludge after the heat treatment is digested together with the initial settling sludge in a digestion tank.
したがって、消化効率の悪い難脱水性濃縮汚泥は熱処理
により有機分が可溶化されて低分子化され、消化効率の
良い初沈汚泥とともに消化されるため、従来のものに比
べて消化率が向上するのみならず単位重量の分解有機物
当りの消化ガス発生量が増大してその有効利用を図るこ
とができ、しかも消化率の向上による消化汚泥固形物量
の低減化を図ることができる。Therefore, the organic content of difficult-to-dewater concentrated sludge, which has poor digestion efficiency, is solubilized and reduced to low molecular weight by heat treatment, and is digested together with the first settling sludge, which has good digestion efficiency, resulting in improved digestibility compared to conventional sludge. In addition, the amount of digested gas generated per unit weight of decomposed organic matter increases, making it possible to utilize it more effectively, and furthermore, it is possible to reduce the amount of solid matter in the digested sludge by improving the digestibility.
以下１本発明の一実施例を図面にもとづいて説明する。An embodiment of the present invention will be described below with reference to the drawings.
図面において、（１）は最初沈殿池から取り出された後
に濃縮された初沈濃縮汚泥の供給経路。In the drawing, (1) is the supply route for the initial settled and concentrated sludge that is concentrated after being taken out from the initial settling tank.
また（２）は余剰濃縮汚泥や高次処理濃縮汚泥等の難脱
水性濃縮汚泥の供給経路であり、その途中には熱処理装
置（３）が設けられている。（４）は消化槽であり、供
給経路（１）と、熱処理装置（３）よりも下流側の供給
経路（２）とがともに導かれている。（５）は消化槽（
４）からの消化汚泥を脱水させるための脱水機である。Further, (2) is a supply path for difficult-to-dewater thickened sludge such as surplus thickened sludge or higher-level treated thickened sludge, and a heat treatment device (3) is provided along the way. (4) is a digestion tank, into which both the supply route (1) and the supply route (2) downstream of the heat treatment device (3) are led. (5) is the digestion tank (
This is a dehydrator for dewatering the digested sludge from 4).
熱処理装置（３）は、供給された難脱水性濃縮汚泥を加
熱するための第１熱交換器（６）と、第１熱交換器（６
）から供給される加熱後の汚泥を２空気供給経路（７）
からの空気で接触混和させるとともに蒸気供給経路（８
）からの蒸気で１６５℃以下に加熱し、低温加圧方式に
より熱処理させる反応缶（９）と・反応缶（９）からの
熱処理汚泥を冷却させる第２熱交換器ｏＱと、排泥弁ｏ
９とを有している。四は反応缶（９）からの分解ガス排
出路で−ある。時は汚泥の冷却および加熱系であり、第
２熱交換器Ｑ１にて熱処理汚泥を冷却することにより反
対に加熱された軟水を第１熱交換器（６）に通し、この
第１熱交換器（６）にて汚泥を加熱させている。σ→は
ｉ張タンク、（ト）は循環ポンプであり、これらにより
循環系を構成している。The heat treatment device (3) includes a first heat exchanger (6) for heating the supplied thickened sludge and a first heat exchanger (6).
) The heated sludge supplied from 2 air supply routes (7)
The steam supply path (8
) A reaction vessel (9) that is heated to 165°C or less with steam from the reactor (9) and subjected to heat treatment using a low-temperature pressurization method, a second heat exchanger oQ that cools the heat-treated sludge from the reaction vessel (9), and a sludge removal valve o.
9. 4 is a cracked gas discharge path from the reaction vessel (9). This is a sludge cooling and heating system, in which the heated soft water is passed through the first heat exchanger (6) by cooling the heat-treated sludge in the second heat exchanger Q1. The sludge is heated in (6). σ→ is an i-tension tank, and (g) is a circulation pump, which constitute a circulation system.
（イ）は消化槽（４）にて発生した消化ガスの排出経路
であり５反応缶（９）への蒸気を発生させるボイラＯη
へ接続されている。(A) is the exhaust route for the digestion gas generated in the digestion tank (4), which is the boiler Oη that generates steam to the 5 reaction can (9).
connected to.
汚泥処理の手順を説明する。最初沈殿池から取り出され
た後濃度４％程度に濃縮された初沈濃縮汚泥と、濃度４
％程度に濃縮された余剰濃縮汚泥や同程度に濃縮された
高次処理濃縮汚泥等の難脱水性濃縮汚泥とを予め分離し
ておき、それぞれ供給経路（１）し）に供給する。Explain the procedure for sludge treatment. Initial sedimentation thickened sludge that was taken out from the initial settling tank and concentrated to a concentration of about 4%, and
Excess thickened sludge that has been concentrated to about 10% and hard-to-dewater thickened sludge that has been concentrated to the same degree such as high-level treatment thickened sludge are separated in advance and supplied to the supply route (1).
供給経路（２）に供給された難脱水性濃縮汚泥は、第１
熱交換器（６）で加熱された後反応缶（９）に送られ、
空気供給経路（７）からの空気と蒸気供給経路（８）か
らの蒸気によって熱処理される。反応缶（９）からの熱
処理汚泥は第２熱交換器（１０で冷却され、排泥弁０］
）を経て消化槽（４）へ送られる。消化槽（４）では、
供給経路（１）からの初沈濃縮汚泥と熱処理装置（３）
からの熱処理汚泥とがともに消化される。消化槽（４）
からの消化汚泥は脱水機（５）で薬注脱水され、脱水ケ
ーキは図外の焼却炉で焼却処理される。The difficult-to-dewater concentrated sludge supplied to the supply route (2) is
After being heated in a heat exchanger (6), it is sent to a reaction vessel (9),
Heat treatment is performed using air from the air supply path (7) and steam from the steam supply path (8). The heat-treated sludge from the reaction vessel (9) is cooled in the second heat exchanger (10, and is passed through the sludge removal valve 0).
) and sent to the digestion tank (4). In the digestion tank (4),
Initial sedimentation thickened sludge from supply route (1) and heat treatment equipment (3)
The heat-treated sludge from the plant is digested together with the heat-treated sludge. Digestion tank (4)
Digested sludge is chemically dehydrated in a dehydrator (5), and the dehydrated cake is incinerated in an incinerator (not shown).
消化槽（４）で発生した消化ガスは、排出経路０・を経
て燃料としてボイラ（ロ）に送られ１反応缶（９）へ供
給する蒸気を発生させる。Digestion gas generated in the digestion tank (4) is sent as fuel to the boiler (b) via the exhaust route 0, and generates steam to be supplied to the reactor 1 (9).
このように本発明によれば、消化効率の悪い難脱水性濃
縮汚泥は熱処理により有機物が可溶化されて低分子化さ
れ、消化効率の良い消化汚泥と混合して消化が行なわれ
ることになる。したがって。As described above, according to the present invention, the organic matter of the difficult-to-dewater concentrated sludge with poor digestion efficiency is solubilized and reduced in molecular weight through heat treatment, and the mixture is mixed with digested sludge with good digestion efficiency to be digested. therefore.
第１表に示すように、従来生汚泥を全て消化槽（４）に
供給した場合に、消化槽（４）での効率として消化率４
０％、カス発生ｊｉ ７００〜８００”／ ｋｇ’ 分
子’Ｊｌ有ａ物であったものが１本発明によれば消化率
５０〜６０％ガス発生ｆｉ１１００〜１２００ｅ／ｋｇ
・分解有機物 となり、消化率の向上による固形物の減
少と発生消化ガスの有効利用とを図ることができる。As shown in Table 1, when all conventional raw sludge is supplied to the digestion tank (4), the efficiency in the digestion tank (4) is 4
According to the present invention, the digestibility is 50-60%, gas generation is 1100-1200 e/kg.
・It becomes decomposed organic matter, which improves digestibility, reduces solids, and makes effective use of generated digestion gas.
また、従来１反応缶（９）へ供給する蒸気はオイル焚き
の専焼ボイラか、脱水ケーキを焼却させる焼却炉からの
熱回収により発生させているが１本発明によれば消化槽
（４）で発生した消化ガスをボイラ第 １、表
コ
の燃料として使用でき、しかも必要かつ十分な発生ガス
屋を期待できる。Furthermore, conventionally, the steam supplied to the reactor (9) is generated by an oil-fired dedicated boiler or by recovering heat from an incinerator that incinerates the dehydrated cake, but according to the present invention, the steam supplied to the reactor (9) is generated by the digester (4). The generated digestion gas can be used as fuel for boiler No. 1 and the front boiler, and moreover, it can be expected that there will be a necessary and sufficient gas generator.
さらに、消化槽（４）へ供給する汚泥は通常４０℃程度
に昇温させねばならず、従来はこのための熱源が別に必
要であったが１本発明によれば熱処理汚泥を６０〜７０
℃とすることができ、これによって初沈濃縮汚泥を所要
温度に昇温させることができるため、二上記従来のよう
な熱源は不要となる。Furthermore, the sludge supplied to the digestion tank (4) usually has to be heated to about 40°C, and conventionally a separate heat source was required for this purpose, but according to the present invention, the heat-treated sludge is
℃, thereby making it possible to raise the temperature of the initially settled thickened sludge to the required temperature, thereby eliminating the need for a heat source like the conventional heat source described above.
以上述べたように本発明によると、消化効率の悪い難脱
水性濃縮汚泥は熱処理により有機分が可溶化されて低分
子化され、消化効率の良い初沈汚泥とともに消化される
ため、従来のものに比べて消化率が向上するのみならず
単位重量の分解有機物当りの消化ガス発生量が増大して
その有効利用を図ることができ、しかも消化率の向上に
よる消化汚泥固形物量の低減化を図ることができる。As described above, according to the present invention, the organic content of the difficult-to-dewater concentrated sludge, which has poor digestion efficiency, is solubilized and reduced to low molecular weight by heat treatment, and is digested together with the first settling sludge, which has good digestion efficiency, so that it is easier to digest than the conventional sludge. Not only is the digestibility improved compared to the conventional method, but the amount of digestive gas generated per unit weight of decomposed organic matter is increased, making it possible to use it more effectively.Moreover, the improved digestibility reduces the amount of solid matter in digested sludge. be able to.
図面は本発明の一実施例を説明するための概略構成図で
ある。
（１）−供給経路ｂ（ｚ）−”供給経路、（３）−・熱
処理装置、（４） ・・・消化槽、（５）・・・脱水機
、（９）・・・反応缶、０・・・・排出経路、Ｑ乃・・
・ボイラ
代理人 森本義弘The drawings are schematic configuration diagrams for explaining one embodiment of the present invention. (1) - Supply route b (z) - "Supply route, (3) - Heat treatment device, (4) ... Digestion tank, (5) ... Dehydrator, (9) ... Reactor, 0...Emission route, Qno...
・Boiler agent Yoshihiro Morimoto
Claims (1)
に分離し、前記難脱水性濃縮汚泥を反応缶で熱処理させ
、熱処理後の熱処理汚泥を前記初沈汚泥とともに消化槽
で消化させることを特徴とする汚泥処理方法。1. Separate the sludge to be treated into initial settling concentrated sludge and difficult-to-dewatering concentrated sludge, heat-treating the difficult-to-dewatering concentrated sludge in a reaction tank, and digesting the heat-treated sludge together with the initial settling sludge in a digestion tank. A sludge treatment method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58129929A JPS6022996A (en) | 1983-07-15 | 1983-07-15 | Process for treating sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58129929A JPS6022996A (en) | 1983-07-15 | 1983-07-15 | Process for treating sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6022996A true JPS6022996A (en) | 1985-02-05 |
Family
ID=15021907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58129929A Pending JPS6022996A (en) | 1983-07-15 | 1983-07-15 | Process for treating sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6022996A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2355979A (en) * | 1999-11-05 | 2001-05-09 | Monsal Ltd | Heating sludge |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5845800A (en) * | 1981-09-11 | 1983-03-17 | Takuma Sogo Kenkyusho:Kk | Treatment of sludge |
| JPS5895600A (en) * | 1981-11-30 | 1983-06-07 | Takuma Sogo Kenkyusho:Kk | Treatment of sludge |
| JPS59134196A (en) * | 1983-01-13 | 1984-08-01 | 株式会社 東京タツノ | Oil station |
-
1983
- 1983-07-15 JP JP58129929A patent/JPS6022996A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5845800A (en) * | 1981-09-11 | 1983-03-17 | Takuma Sogo Kenkyusho:Kk | Treatment of sludge |
| JPS5895600A (en) * | 1981-11-30 | 1983-06-07 | Takuma Sogo Kenkyusho:Kk | Treatment of sludge |
| JPS59134196A (en) * | 1983-01-13 | 1984-08-01 | 株式会社 東京タツノ | Oil station |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2355979A (en) * | 1999-11-05 | 2001-05-09 | Monsal Ltd | Heating sludge |
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