JP2003200198A - Method and apparatus for treating sludge - Google Patents

Method and apparatus for treating sludge

Info

Publication number
JP2003200198A
JP2003200198A JP2002004444A JP2002004444A JP2003200198A JP 2003200198 A JP2003200198 A JP 2003200198A JP 2002004444 A JP2002004444 A JP 2002004444A JP 2002004444 A JP2002004444 A JP 2002004444A JP 2003200198 A JP2003200198 A JP 2003200198A
Authority
JP
Japan
Prior art keywords
sludge
treatment
digested
methane fermentation
fermentation tank
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.)
Granted
Application number
JP2002004444A
Other languages
Japanese (ja)
Inventor
Shizuo Mita
志津雄 三田
Akira Cho
亮 張
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maezawa Industries Inc
Original Assignee
Maezawa Industries Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Maezawa Industries Inc filed Critical Maezawa Industries Inc
Priority to JP2002004444A priority Critical patent/JP2003200198A/en
Publication of JP2003200198A publication Critical patent/JP2003200198A/en
Granted legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for treating sludge which can increase the amount of methane generated in the anaerobic digestion treatment of sludge and reduce sludge volume. <P>SOLUTION: In this sludge treatment method where the sludge generated in a water treatment process is treated by anaerobic digestion, a concentration process of the digested sludge is performed in a membrane filtration tank 12 installed after an anaerobic digestion process in a methane fermentation tank 11, the digested sludge thickened by the concentration process is circulated and introduced into the methane fermentation tank 11 through a thickened sludge circulation path 13 to be anaerobically digested again, and at least a part of the digested sludge introduced into the anaerobic digestion process is introduced into an ultrasonic irradiation means 14, where the sludge is treated by ultrasonic irradiation. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、汚泥処理方法及び
装置に関し、詳しくは、下水、産業排水、畜産排水等の
廃水を処理する水処理工程で発生した汚泥をメタン発酵
槽で嫌気消化処理を行って処理する方法及び装置に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge treatment method and apparatus, and more specifically, to sludge generated in a water treatment process for treating wastewater such as sewage, industrial wastewater, and livestock wastewater by anaerobic digestion treatment in a methane fermentation tank. A method and apparatus for performing and processing.

【0002】[0002]

【従来の技術】一般に、下水、産業排水、畜産排水等の
廃水の処理には生物処理が用いられており、生物学的な
BOD成分の除去に伴って多量の余剰汚泥が排出されて
いるが、余剰汚泥処理費用の高騰及び最終処分場の不足
等から、余剰汚泥を有機資源としてメタン発酵させる嫌
気消化処理が注目されている。
2. Description of the Related Art Generally, biological treatment is used for treating wastewater such as sewage, industrial wastewater, and livestock wastewater, and a large amount of excess sludge is discharged along with the removal of biological BOD components. However, due to soaring costs of surplus sludge treatment and shortage of final disposal sites, anaerobic digestion treatment, in which surplus sludge is subjected to methane fermentation as an organic resource, is drawing attention.

【0003】汚泥の嫌気消化工程は、嫌気的状態で微生
物の分解作用を利用して有機物量の低減と汚泥の減量と
を目的としており、食品残渣、屎尿処理等の有機性廃棄
物の処理に広く利用されている。しかし、これらの有機
性廃棄物に比べて、余剰汚泥は消化効率が一般的に悪
い。その原因として、余剰汚泥中には細胞壁で守られた
微生物由来難分解性成分が多いことが挙げられている。
このため、従来の余剰汚泥発酵装置では、消化効率が僅
か30%程度であり、汚泥減量への寄与が十分ではな
い。その上に、嫌気消化後に得られる消化液の水質が悪
く、処理が困難という問題が発生している。
The anaerobic digestion process of sludge is intended to reduce the amount of organic substances and the amount of sludge by utilizing the decomposition action of microorganisms in an anaerobic state, and to treat organic waste such as food residues and human waste treatment. Widely used. However, compared to these organic wastes, excess sludge generally has poor digestion efficiency. It is said that the excess sludge contains a large amount of microorganism-derived persistent components protected by cell walls.
Therefore, in the conventional excess sludge fermenter, the digestion efficiency is only about 30%, and the contribution to sludge reduction is not sufficient. In addition, the water quality of the digestive juice obtained after anaerobic digestion is poor, and there is a problem that the treatment is difficult.

【0004】一方、水処理工程で発生する汚泥に超音波
を照射して汚泥の性状を改質し、メタン発酵効率を改善
する方法が報告されている。この方法は、汚泥に超音波
を照射することにより、汚泥フロックの分散や細胞壁の
破壊を起こしてメタン発酵効率を改善させるというもの
である。
On the other hand, it has been reported that the sludge generated in the water treatment process is irradiated with ultrasonic waves to improve the properties of the sludge and improve the efficiency of methane fermentation. This method is to improve the methane fermentation efficiency by irradiating sludge with ultrasonic waves to cause dispersion of sludge flocs and destruction of cell walls.

【0005】[0005]

【発明が解決しようとする課題】しかし、汚泥全量を超
音波照射してしまうと、処理設備が大きくなってしまう
という問題がある。また、汚泥の全量に超音波照射を行
うと、超音波を発生するエネルギーが多く必要となり、
ランニングコストが高くなるという欠点もある。さら
に、易分解性成分にも超音波が無差別に作用するため、
超音波の利用効率が低いという問題もある。
However, if the whole amount of sludge is irradiated with ultrasonic waves, there is a problem that the treatment equipment becomes large. Moreover, if ultrasonic irradiation is applied to the entire amount of sludge, a large amount of energy for generating ultrasonic waves is required,
There is also a drawback that the running cost becomes high. Furthermore, because ultrasonic waves indiscriminately act on easily degradable components,
There is also a problem that the utilization efficiency of ultrasonic waves is low.

【0006】そこで本発明は、超音波照射を組み合わせ
た嫌気消化処理の効率向上を図り、メタン発生量の増大
と汚泥の減量化とを図れる汚泥処理方法及び装置を提供
することを目的としている。
[0006] Therefore, an object of the present invention is to provide a sludge treatment method and apparatus capable of improving the efficiency of anaerobic digestion treatment combined with ultrasonic irradiation, and increasing the amount of methane generation and reducing the amount of sludge.

【0007】[0007]

【課題を解決するための手段】上記目的を達成するた
め、本発明の汚泥処理方法は、水処理工程で発生する汚
泥を嫌気消化工程によって処理する方法において、嫌気
消化工程後に消化汚泥の濃縮工程を行い、該濃縮工程で
濃縮した消化汚泥を前記嫌気消化工程に循環導入して再
処理を行うとともに、嫌気消化工程に導入する前記消化
汚泥の一部に超音波照射処理を行うことを特徴としてい
る。
In order to achieve the above object, the sludge treatment method of the present invention is a method for treating sludge generated in a water treatment step by an anaerobic digestion step, wherein the digested sludge concentration step is performed after the anaerobic digestion step. The digestive sludge concentrated in the concentration step is circulated and introduced into the anaerobic digestion step for reprocessing, and a part of the digested sludge to be introduced into the anaerobic digestion step is subjected to ultrasonic irradiation. There is.

【0008】また、本発明の汚泥処理装置は、水処理工
程で発生する汚泥を嫌気消化処理するメタン発酵槽を備
えた汚泥処理装置において、メタン発酵槽の後段に消化
汚泥濃縮手段を設置し、該消化汚泥濃縮手段で濃縮した
消化汚泥を前記メタン発酵槽に循環導入する経路を設け
るとともに、メタン発酵槽に導入する前記消化汚泥の一
部に超音波照射処理を行う超音波照射手段を設けたこと
を特徴としている。
The sludge treatment apparatus of the present invention is a sludge treatment apparatus equipped with a methane fermentation tank for anaerobically digesting sludge generated in a water treatment process, wherein digested sludge concentrating means is installed in the latter stage of the methane fermentation tank, A route for circulating and introducing the digested sludge concentrated by the digested sludge concentrating means into the methane fermentation tank was provided, and an ultrasonic irradiation means for performing ultrasonic irradiation treatment on a part of the digested sludge introduced into the methane fermentation tank was provided. It is characterized by that.

【0009】[0009]

【発明の実施の形態】図1は、本発明の第1形態例を示
す汚泥処理装置の系統図である。この汚泥処理装置は、
水処理工程で発生する初沈汚泥や余剰汚泥の嫌気消化工
程を行うメタン発酵槽11と、該メタン発酵槽11の後
段に設けられて消化汚泥の濃縮工程を行う汚泥濃縮手段
としての膜ろ過槽12と、該膜ろ過槽12で濃縮した消
化汚泥をメタン発酵槽11に循環導入するための濃縮汚
泥循環経路13と、該濃縮汚泥循環経路13と並列に設
けられた超音波照射手段14とにより形成されている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram of a sludge treatment device showing a first embodiment of the present invention. This sludge treatment device
A methane fermentation tank 11 that performs an anaerobic digestion process for initial sludge and surplus sludge generated in a water treatment process, and a membrane filtration tank as a sludge concentrating means that is provided at a subsequent stage of the methane fermentation tank 11 and performs a digestion sludge concentration process. 12, a concentrated sludge circulation path 13 for circulating and introducing the digested sludge concentrated in the membrane filtration tank 12 into the methane fermentation tank 11, and an ultrasonic wave irradiation means 14 provided in parallel with the concentrated sludge circulation path 13. Has been formed.

【0010】水処理工程から抜き取られて汚泥流入経路
21から流入する汚泥は、濃縮汚泥循環経路13から循
環する濃縮汚泥と合流してメタン発酵槽11に流入し、
このメタン発酵槽11で汚泥の嫌気消化処理が行われ、
微生物の作用によって有機物量が低減して汚泥が減量す
るとともにメタンが発生する。発生したメタンは、メタ
ン回収経路22からメタンガスとして回収され、燃料と
して用いられる。
The sludge extracted from the water treatment process and flowing in from the sludge inflow route 21 joins the concentrated sludge circulating in the concentrated sludge circulation route 13 and flows into the methane fermentation tank 11.
Anaerobic digestion of sludge is performed in this methane fermentation tank 11,
Due to the action of microorganisms, the amount of organic matter is reduced, sludge is reduced, and methane is generated. The generated methane is recovered as methane gas from the methane recovery route 22 and used as fuel.

【0011】メタン発酵槽11内の消化汚泥は、経路2
4を通って膜ろ過槽12に導入され、この膜ろ過槽12
で消化汚泥の濃縮が行われる。膜ろ過によって分離した
処理水は、経路25を通って水処理工程に送られ、濃縮
された消化汚泥は、前記濃縮汚泥循環経路13に抜き出
される。そして、濃縮汚泥循環経路13を通る消化汚泥
の少なくとも一部は、超音波照射手段14が設けられた
超音波照射経路26に分岐し、超音波照射手段14で超
音波照射処理が行われた後、再び濃縮汚泥循環経路13
に戻り、汚泥流入経路21から流入する汚泥と混合して
メタン発酵槽11に循環導入される。
Digested sludge in the methane fermentation tank 11 is route 2
4 is introduced into the membrane filtration tank 12 through
The digested sludge is concentrated at. The treated water separated by the membrane filtration is sent to the water treatment process through the path 25, and the concentrated digested sludge is extracted to the concentrated sludge circulation path 13. Then, at least a part of the digested sludge passing through the concentrated sludge circulation path 13 is branched to the ultrasonic wave irradiation path 26 provided with the ultrasonic wave irradiation means 14, and after the ultrasonic wave irradiation processing is performed by the ultrasonic wave irradiation means 14. , Again concentrated sludge circulation route 13
Then, it is mixed with the sludge flowing in from the sludge inflow route 21 and is circulated and introduced into the methane fermentation tank 11.

【0012】超音波照射手段14で超音波照射処理を行
う消化汚泥量は、汚泥処理量の規模や、汚泥の性状を勘
案して設定することができ、例えば、汚泥流入経路21
からの新規流入汚泥量、濃縮汚泥循環経路13を通る濃
縮した消化汚泥量に応じて設定すればよく、濃縮汚泥循
環経路13を通る濃縮消化汚泥の全量に対して超音波照
射処理を行うようにしてもよい。
The amount of digested sludge to be subjected to ultrasonic wave irradiation by the ultrasonic wave irradiation means 14 can be set in consideration of the scale of the sludge treatment amount and the property of the sludge. For example, the sludge inflow route 21
It may be set according to the amount of newly inflowing sludge from the above and the amount of concentrated digested sludge passing through the concentrated sludge circulation route 13, and ultrasonic irradiation processing is performed on all the amount of concentrated digested sludge passing through the concentrated sludge circulation route 13. May be.

【0013】なお、無機分等の消化できない固形成分が
メタン発酵槽11内に蓄積された場合は、必要に応じ
て、メタン発酵槽11内の消化汚泥の一部を汚泥抜取経
路23から、あるいは、濃縮汚泥循環経路13から抜き
取って系外へ送るようにする。このときの抜き取り量及
び頻度は、汚泥の性状に応じて適宜設定すればよい。
If solid components such as inorganic matter that cannot be digested are accumulated in the methane fermentation tank 11, a part of the digested sludge in the methane fermentation tank 11 may be removed from the sludge withdrawal route 23, if necessary. , It is taken out from the concentrated sludge circulation path 13 and sent to the outside of the system. The withdrawal amount and frequency at this time may be appropriately set according to the properties of the sludge.

【0014】図2は、本発明の第2形態例を示す汚泥処
理装置の系統図である。この汚泥処理装置は、膜ろ過槽
12から濃縮汚泥循環経路13を通って循環する濃縮消
化汚泥と、汚泥流入経路21から流入する新規流入汚泥
とが混合した後の経路に、超音波照射手段14を設けた
超音波照射経路26を並列に接続したものである。すな
わち、本形態例では、濃縮消化汚泥と新規流入汚泥とが
混合した汚泥の一部を超音波照射経路26に分岐し、超
音波照射手段14で超音波照射を行った後、超音波照射
を行わない汚泥と合流させてメタン発酵槽11に導入す
るようにしている。
FIG. 2 is a system diagram of a sludge treatment device showing a second embodiment of the present invention. In this sludge treatment device, the ultrasonic irradiation means 14 is provided in the path after the concentrated digested sludge circulated from the membrane filtration tank 12 through the concentrated sludge circulation path 13 and the new inflow sludge flowing in from the sludge inflow path 21 are mixed. The ultrasonic wave irradiation paths 26 provided with are connected in parallel. That is, in this embodiment, a part of the sludge in which the concentrated digested sludge and the new inflow sludge are mixed is branched to the ultrasonic wave irradiation path 26, and ultrasonic wave irradiation is performed after ultrasonic wave irradiation is performed by the ultrasonic wave irradiation means 14. It is arranged to be introduced into the methane fermentation tank 11 after being combined with sludge that is not used.

【0015】両形態例において、超音波照射経路26に
分岐する消化汚泥量、すなわち、循環する全消化汚泥量
に占める超音波照射処理を行う消化汚泥量の割合は、汚
泥の性状によって多少異なるが、一般的には、20%以
上、好ましくは30%以上が適当であり、超音波を照射
した汚泥が少なすぎると、改質効果が薄れ、所望の処理
結果が得られないことがある。
In both of the embodiments, the amount of digested sludge branched to the ultrasonic irradiation route 26, that is, the ratio of the amount of digested sludge to be subjected to ultrasonic irradiation treatment to the total amount of digested sludge circulated varies depending on the properties of the sludge. Generally, 20% or more, preferably 30% or more is suitable, and if the amount of sludge irradiated with ultrasonic waves is too small, the modifying effect may be weakened and desired treatment results may not be obtained.

【0016】このように、水処理工程から排出された汚
泥をメタン発酵槽11で嫌気消化処理するにあたり、後
段の膜ろ過槽12で濃縮した消化汚泥をメタン発酵槽1
1に循環させて再処理することにより、メタン発酵槽1
1でのメタン発生量を増大できるとともに、汚泥の減量
を達成することができる。また、メタン発酵槽11に導
入する汚泥の一部に超音波照射処理を行うことにより、
消化できなかった汚泥フロックを解体させたり、細胞壁
を損傷させることができ、細胞の破壊を加速させてメタ
ン発酵槽11でのメタン発生率を向上させることができ
るとともに、超音波の利用効率も向上させることができ
る。
As described above, when the sludge discharged from the water treatment step is subjected to anaerobic digestion treatment in the methane fermentation tank 11, the digested sludge concentrated in the membrane filtration tank 12 in the latter stage is treated in the methane fermentation tank 1
Methane fermenter 1
The amount of methane generated in 1 can be increased, and the amount of sludge can be reduced. In addition, by performing ultrasonic irradiation treatment on a part of the sludge introduced into the methane fermentation tank 11,
Sludge flocs that could not be digested can be dismantled, cell walls can be damaged, cell destruction can be accelerated, the methane generation rate in the methane fermentation tank 11 can be improved, and the utilization efficiency of ultrasonic waves is also improved. Can be made.

【0017】前記超音波照射手段14で被超音波処理を
施す消化汚泥の濃度(MLSS)は、通常、5000m
g/L以上、好ましくは10000mg/L以上、特に
20000mg/L以上が適当である。この汚泥濃度が
低すぎると、超音波の効率が低くなり、所望の処理結果
が得られないことがある。
The concentration (MLSS) of digested sludge to be subjected to ultrasonic treatment by the ultrasonic irradiation means 14 is usually 5000 m.
g / L or more, preferably 10000 mg / L or more, and particularly preferably 20000 mg / L or more. If the sludge concentration is too low, the efficiency of ultrasonic waves will be low, and the desired treatment results may not be obtained.

【0018】超音波照射手段14における超音波の周波
数は、15〜50kHz、好ましくは15〜40kH
z、特に20〜30kHzが適当である。この周波数が
低すぎると、十分な処理効果が得られないことがあり、
高すぎると超音波発振子の摩耗が極端にひどくなり、頻
繁な交換が必要になるおそれがある。
The frequency of the ultrasonic wave in the ultrasonic wave irradiation means 14 is 15 to 50 kHz, preferably 15 to 40 kHz.
z, especially 20-30 kHz is suitable. If this frequency is too low, it may not be possible to obtain sufficient processing effects.
If it is too high, the wear of the ultrasonic oscillator becomes extremely severe, and frequent replacement may be required.

【0019】また、超音波の強度は、照射対象となる汚
泥の量や濃度に応じて適当に設定されるものであるが、
一般的には、5〜100kWs/L、好ましくは10〜
80kWs/L、特に20〜60kWs/Lが適当であ
る。この超音波強度が小さすぎると、十分な効果が得ら
れないことがあり、あまり高くしても、強度に比例した
効果が得られるものではない。
The intensity of ultrasonic waves is set appropriately according to the amount and concentration of sludge to be irradiated.
Generally, 5-100 kWs / L, preferably 10-
80 kWs / L, especially 20-60 kWs / L is suitable. If the ultrasonic wave intensity is too low, a sufficient effect may not be obtained, and if it is too high, an effect proportional to the intensity may not be obtained.

【0020】これらの各条件、すなわち、汚泥濃度、超
音波周波数、超音波強度、超音波照射汚泥量は、各々が
各条件の要素となっており、処理にかかるコスト、処理
時間等を考慮し、効率の良い条件に適宜変更することが
できる。
Each of these conditions, that is, the sludge concentration, ultrasonic frequency, ultrasonic intensity, and ultrasonic irradiation sludge amount, is an element of each condition, and the cost of treatment, treatment time, etc. are taken into consideration. The conditions can be changed as appropriate to improve efficiency.

【0021】なお、超音波照射手段には、超音波照射流
路の途中に汚泥流入口及び汚泥流出口を有する容器を設
けて該容器内に超音波発振子を設置したものや、超音波
照射流路の一部又は全部を形成する管内に超音波発振子
を設置したものを使用でき、汚泥処理量を適当に設定す
ることにより、一般市販品等、公知のものを使用するこ
とができる。
As the ultrasonic wave irradiating means, a container having a sludge inflow port and a sludge outflow port is provided in the middle of the ultrasonic wave irradiating flow path, and an ultrasonic oscillator is installed in the container. It is possible to use a device in which an ultrasonic wave oscillator is installed in a pipe forming a part or all of the flow path, and a known product such as a general commercial product can be used by appropriately setting the sludge treatment amount.

【0022】また、メタン発酵槽11や膜ろ過槽12に
は、この種の装置に従来から用いられている周知のもの
を使用することが可能であり、例えばメタン発酵槽11
には、室温、中温、高温のいずれの形式も使用できる。
さらに、メタン発酵槽11の前に加水分解槽を設けても
よい。汚泥濃縮手段としては、膜ろ過、重力沈降、遠心
脱水、圧力脱水等の公知の手段を選択可能である。その
中でも、膜ろ過による濃縮が好ましく、ろ過膜には精密
ろ過、限外ろ過等を使用できるが、特に限外ろ過が最適
である。
Further, as the methane fermentation tank 11 and the membrane filtration tank 12, it is possible to use well-known ones conventionally used in this kind of apparatus, for example, the methane fermentation tank 11
Any of room temperature, medium temperature, and high temperature can be used for this.
Further, a hydrolysis tank may be provided before the methane fermentation tank 11. As the sludge concentrating means, known means such as membrane filtration, gravity settling, centrifugal dehydration, pressure dehydration and the like can be selected. Of these, concentration by membrane filtration is preferable, and microfiltration, ultrafiltration, etc. can be used for the filtration membrane, but ultrafiltration is particularly suitable.

【0023】[0023]

【発明の効果】以上説明したように、本発明によれば、
汚泥を嫌気消化処理する際に発生するメタンガスの発生
量を増大することができ、有効なエネルギーとして回収
できるとともに、汚泥の減量化も図れる。
As described above, according to the present invention,
The amount of methane gas generated during anaerobic digestion of sludge can be increased, the energy can be recovered as effective energy, and the amount of sludge can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】 本発明の第1形態例を示す汚泥処理装置の系
統図である。
FIG. 1 is a system diagram of a sludge treatment device showing a first embodiment example of the present invention.

【図2】 本発明の第2形態例を示す汚泥処理装置の系
統図である。
FIG. 2 is a system diagram of a sludge treatment device showing a second embodiment of the present invention.

【符号の説明】[Explanation of symbols]

11…メタン発酵槽、12…膜ろ過槽、13…濃縮汚泥
循環経路、14…超音波照射手段、21…汚泥流入経
路、22…メタン回収経路、23…汚泥抜取経路、26
…超音波照射経路
11 ... Methane fermentation tank, 12 ... Membrane filtration tank, 13 ... Concentrated sludge circulation path, 14 ... Ultrasonic irradiation means, 21 ... Sludge inflow path, 22 ... Methane recovery path, 23 ... Sludge extraction path, 26
… Ultrasonic irradiation route

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 水処理工程で発生する汚泥を嫌気消化工
程によって処理する方法において、嫌気消化工程後に消
化汚泥の濃縮工程を行い、該濃縮工程で濃縮した消化汚
泥を前記嫌気消化工程に循環導入して再処理を行うとと
もに、嫌気消化工程に導入する前記消化汚泥の一部に超
音波照射処理を行うことを特徴とする汚泥処理方法。
1. A method for treating sludge generated in a water treatment step by an anaerobic digestion step, wherein a digestion sludge concentration step is performed after the anaerobic digestion step, and the digested sludge concentrated in the concentration step is circulated and introduced into the anaerobic digestion step. Sludge treatment method, wherein a part of the digested sludge to be introduced into the anaerobic digestion step is subjected to ultrasonic irradiation treatment.
【請求項2】 水処理工程で発生する汚泥を嫌気消化処
理するメタン発酵槽を備えた汚泥処理装置において、メ
タン発酵槽の後段に消化汚泥濃縮手段を設置し、該消化
汚泥濃縮手段で濃縮した消化汚泥を前記メタン発酵槽に
循環導入する経路を設けるとともに、メタン発酵槽に導
入する前記消化汚泥の一部に超音波照射処理を行う超音
波照射手段を設けたことを特徴とする汚泥処理装置。
2. A sludge treatment device equipped with a methane fermentation tank for anaerobically digesting sludge generated in a water treatment step, wherein digestive sludge concentrating means is installed in the latter stage of the methane fermentation tank and concentrated by the digestive sludge concentrating means. A sludge treatment device provided with a path for circulating and introducing digested sludge into the methane fermentation tank, and ultrasonic wave irradiation means for performing ultrasonic irradiation treatment on a part of the digested sludge to be introduced into the methane fermentation tank. .
JP2002004444A 2002-01-11 2002-01-11 Method and apparatus for treating sludge Granted JP2003200198A (en)

Priority Applications (1)

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JP2002004444A JP2003200198A (en) 2002-01-11 2002-01-11 Method and apparatus for treating sludge

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Application Number Priority Date Filing Date Title
JP2002004444A JP2003200198A (en) 2002-01-11 2002-01-11 Method and apparatus for treating sludge

Publications (1)

Publication Number Publication Date
JP2003200198A true JP2003200198A (en) 2003-07-15

Family

ID=27643767

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2003200198A (en)

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US7198717B2 (en) 2004-08-26 2007-04-03 Graham John Gibson Juby Anoxic biological reduction system
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