JP7446821B2 - Anaerobic digestion systems and methods - Google Patents

Anaerobic digestion systems and methods Download PDF

Info

Publication number
JP7446821B2
JP7446821B2 JP2020005969A JP2020005969A JP7446821B2 JP 7446821 B2 JP7446821 B2 JP 7446821B2 JP 2020005969 A JP2020005969 A JP 2020005969A JP 2020005969 A JP2020005969 A JP 2020005969A JP 7446821 B2 JP7446821 B2 JP 7446821B2
Authority
JP
Japan
Prior art keywords
sludge
anaerobic digestion
heat exchanger
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.)
Active
Application number
JP2020005969A
Other languages
Japanese (ja)
Other versions
JP2021112699A (en
Inventor
恵之 正木
元 栗原
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.)
Mitsubishi Kakoki Kaisha Ltd
Original Assignee
Mitsubishi Kakoki Kaisha Ltd
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 Mitsubishi Kakoki Kaisha Ltd filed Critical Mitsubishi Kakoki Kaisha Ltd
Priority to JP2020005969A priority Critical patent/JP7446821B2/en
Publication of JP2021112699A publication Critical patent/JP2021112699A/en
Application granted granted Critical
Publication of JP7446821B2 publication Critical patent/JP7446821B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Treatment Of Sludge (AREA)

Description

本発明は、嫌気性消化システムおよび嫌気性消化方法に関する。 The present invention relates to an anaerobic digestion system and an anaerobic digestion method.

図６に、従来の下水汚泥の消化設備の模式図を示す。
従来、下水汚泥の消化設備の関連施設では、下水汚泥を含む流入水が最初沈殿池１０２、反応槽１０３、最終沈殿池１０４の順に送られる。
最初沈殿池１０２では、自然沈降が行われ、固形物濃度が１～２％に濃縮される。下水汚泥を含む流入水は、最初沈殿池１０２で、上澄み液と沈殿物の汚泥(以下、初沈汚泥と称す)とに分離される。 FIG. 6 shows a schematic diagram of conventional sewage sludge digestion equipment.
Conventionally, in facilities related to sewage sludge digestion equipment, inflow water containing sewage sludge is sent to an initial settling tank 102, a reaction tank 103, and a final settling tank 104 in this order.
In the initial sedimentation tank 102, natural sedimentation is performed to concentrate the solids to 1 to 2%. Inflow water containing sewage sludge is separated into supernatant liquid and precipitated sludge (hereinafter referred to as initial settling sludge) in the initial settling tank 102.

上澄み液は反応槽１０２に送られ、反応槽１０２で好気性微生物により好気処理が行われる。
最終沈殿池１０４では、好気処理が行われた処理液が、上澄み液と、沈殿物の汚泥(以下、余剰汚泥と称す)とに分離され、余剰汚泥は機械濃縮により固形物濃度で３～６％に濃縮される。
最初沈殿池１０２の初沈汚泥が濃縮された濃縮初沈汚泥は、ポンプＰ１１により、ラインｋ１１を経由して、嫌気性消化槽１０１に送られる。 The supernatant liquid is sent to the reaction tank 102, where it is subjected to aerobic treatment by aerobic microorganisms.
In the final settling tank 104, the treated liquid subjected to aerobic treatment is separated into supernatant liquid and precipitated sludge (hereinafter referred to as surplus sludge). Concentrated to 6%.
The concentrated initial settling sludge obtained by concentrating the initial settling sludge in the initial settling tank 102 is sent to the anaerobic digestion tank 101 via a line k11 by a pump P11.

また、最終沈殿池１０４の余剰汚泥が濃縮された濃縮余剰汚泥は、ポンプＰ１２により、ラインｋ１１を経由して、嫌気性消化槽１０１に送られる。
嫌気性消化槽１０１では、嫌気性消化処理が行われる。嫌気性消化処理は、３５～３８℃で消化日数(初沈汚泥、余剰汚泥の当該タンクの滞留日数)が２０～３０日の中温消化と、５０～５５℃で消化日数が１０～２０日の高温消化とがある。 Further, the concentrated surplus sludge obtained by concentrating the surplus sludge in the final settling tank 104 is sent to the anaerobic digestion tank 101 via the line k11 by the pump P12.
In the anaerobic digestion tank 101, anaerobic digestion processing is performed. Anaerobic digestion treatment consists of mesophilic digestion at 35 to 38°C for 20 to 30 days (the number of days that initial settling sludge and surplus sludge remain in the tank) and 10 to 20 days for digestion at 50 to 55°C. There is high temperature digestion.

嫌気性消化槽１０１での嫌気性微生物による消化の温度を維持するために、外部から熱を、消化汚泥が嫌気性消化槽１０１に循環する循環ラインｊ１１を通して、嫌気性消化槽１０１内に供給して加温している。循環ラインｊ１１には、嫌気性消化槽１０１の消化汚泥を加温するための熱交換器１０５と、消化汚泥を熱交換器１０５に送る循環ポンプＰ１３とが、設けられている。 In order to maintain the temperature of digestion by anaerobic microorganisms in the anaerobic digestion tank 101, heat is supplied from the outside into the anaerobic digestion tank 101 through the circulation line j11 through which the digested sludge is circulated to the anaerobic digestion tank 101. It is heated by The circulation line j11 is provided with a heat exchanger 105 for heating the digested sludge in the anaerobic digestion tank 101 and a circulation pump P13 for sending the digested sludge to the heat exchanger 105.

投入汚泥の嫌気性消化槽１０１への投入は、通常、加温のための消化汚泥の循環ラインｊ１１とは別途にラインｋ１１から投入される。
前記したように、投入汚泥は、通常、固形物濃度が２～６％に濃縮された状態である。 The input sludge is normally input into the anaerobic digestion tank 101 through a line k11, which is separate from the digested sludge circulation line j11 for heating.
As mentioned above, the input sludge is usually concentrated to a solids concentration of 2 to 6%.

一方、図６の構成と異なり、嫌気性消化槽１０１への汚泥の投入に際して、予め熱交換器を経由して、加温してからの濃縮初沈汚泥と濃縮余剰汚泥の嫌気性消化槽１０１への投入は、次の問題が生じる。すなわち、熱交換器における投入汚泥中のし渣による閉塞や、熱交換器の伝熱面に投入汚泥中のワックス状の油分が付着する。また、投入汚泥が約２０～３０℃(冬季は約１０～２０℃)であり、投入汚泥が約５０℃の伝熱面にへばり付く。
したがって、熱交換器での熱交換量の不足が生じるため、予め熱交換器を経由して、加温してからの投入汚泥（濃縮初沈汚泥、濃縮余剰汚泥）の嫌気性消化槽１０１への投入は近年、実施されていない。 On the other hand, unlike the configuration shown in FIG. 6, when sludge is introduced into the anaerobic digestion tank 101, the concentrated initial settled sludge and concentrated excess sludge are heated via a heat exchanger beforehand. The following problem arises when inputting That is, the heat exchanger is clogged with sludge in the input sludge, and waxy oil in the input sludge adheres to the heat transfer surface of the heat exchanger. In addition, the input sludge is at a temperature of about 20 to 30°C (approximately 10 to 20°C in winter), and the input sludge sticks to the heat transfer surface at about 50°C.
Therefore, since the amount of heat exchanged in the heat exchanger is insufficient, the input sludge (thickened initial sludge, thickened surplus sludge) is heated beforehand and sent to the anaerobic digestion tank 101 via the heat exchanger. has not been implemented in recent years.

ところで、嫌気性消化槽１０１における消化を効率的に行うため、嫌気性消化槽１０１に貯留される消化汚泥の撹拌が行われる。
嫌気性消化槽１０１における消化汚泥の撹拌については、古くから採用されてきたガス撹拌に代わって、低動力なインペラー型機械撹拌装置の採用が増えている。 By the way, in order to efficiently perform digestion in the anaerobic digestion tank 101, the digested sludge stored in the anaerobic digestion tank 101 is stirred.
Regarding agitation of digested sludge in the anaerobic digestion tank 101, low-power impeller-type mechanical agitation devices are increasingly being used instead of gas agitation, which has been used for a long time.

嫌気性消化槽１０１の加温については、気性消化槽１０１内に直接蒸気を吹き込む方式と、図６に示す消化汚泥を循環ラインｊ１１に循環させて、循環ラインｊ１１に設置した熱交換器１０５で、温水と消化汚泥とが熱交換を行う間接加温式がある。
嫌気性消化槽１０１における消化汚泥中のし渣の塊りが大きくなるのを抑制するための破砕については、間接加温のための循環ラインｊ１１において、熱交換器１０５を経由する前にカッター(図示せず)が設置されることがある。 The anaerobic digestion tank 101 can be heated by blowing steam directly into the pneumatic digestion tank 101, or by circulating the digested sludge shown in FIG. There is an indirect heating type in which hot water and digested sludge exchange heat.
For crushing to suppress the size of sludge in the digested sludge in the anaerobic digestion tank 101, a cutter ( (not shown) may be installed.

下水道施設計画・設計指針と解説－2009年版_後編P350((社)日本下水道協会)Sewerage facility planning/design guidelines and explanations - 2009 edition_Part 2 P350 (Japan Sewage Works Association)

昨今、余剰汚泥を固形化する高分子凝集剤のコストが以前に比べて大きく低下している。そのため、嫌気性消化槽１０１に投入前の汚泥の水分を、遠心濃縮機のように動力をかけて除去して濃縮するより、高分子凝集剤を加えた投入汚泥をベルトや浮上分離で高濃度に汚泥を濃縮する方法が広まりつつある。つまり、下水汚泥の嫌気性消化設備において、高分子凝集剤を用いて(消化槽への)投入汚泥を濃縮することにより高濃度化し、嫌気性消化槽１０１内の固形物濃度を高くするいわゆる「高濃度消化プロセス」が採用されつつある。 Recently, the cost of polymer flocculants that solidify excess sludge has decreased significantly compared to before. Therefore, rather than applying power to remove and concentrate water in sludge before it is introduced into the anaerobic digestion tank 101, as in a centrifugal thickener, the input sludge with a polymer flocculant added thereto can be highly concentrated by belt or flotation separation. The method of thickening sludge is becoming widespread. In other words, in the anaerobic digestion equipment for sewage sludge, the sludge fed into the anaerobic digestion tank 101 is concentrated by using a polymer flocculant to increase the concentration of solids in the anaerobic digestion tank 101. "High concentration digestion process" is being adopted.

一方、前記したように、消化槽の撹拌設備は、古くからガス撹拌に代わって、低動力なインペラー型機械撹拌装置の採用が増えている。
ところが、高分子凝集剤を含んだ濃縮汚泥は、高粘度でスライム化した汚泥で分散性が悪い。
これにより、嫌気性消化槽１０１内での撹拌が難しく、槽(１０１)内に既にある消化汚泥と新たに投入される投入汚泥がうまく混合できずに温度むらが生じる場合がある。その結果、汚泥の消化に支障をきたし、汚泥の発泡現象が生じ、消化率が低下する。つまり、投入汚泥が消化されることで回収できる消化ガスの量が低下する問題がある。 On the other hand, as described above, low-power impeller-type mechanical stirring devices are increasingly being adopted as stirring equipment for digestion tanks, replacing gas stirring for a long time.
However, thickened sludge containing a polymer flocculant is highly viscous and slime-like sludge with poor dispersibility.
As a result, stirring in the anaerobic digestion tank 101 is difficult, and the digested sludge already in the tank (101) and the newly introduced sludge cannot be mixed well, which may result in temperature unevenness. As a result, digestion of the sludge is hindered, foaming of the sludge occurs, and the digestibility is reduced. In other words, there is a problem in that the amount of digestible gas that can be recovered decreases as the input sludge is digested.

さらに、インペラー型機械撹拌装置の採用により、投入汚泥に含まれるし渣がインペラーに絡みついて、経年と共に成長し撹拌状態が著しく低下するケースもある。
本発明は上記実状に鑑み創案されたものであり、嫌気性消化槽の撹拌状態を良好に保ち、消化汚泥の温度むらを小さくして、良好な嫌気性消化を行える嫌気性消化システムおよび嫌気性消化方法の提供を目的とする。 Furthermore, with the adoption of an impeller-type mechanical agitation device, there are cases in which the sludge contained in the input sludge gets entangled with the impeller and grows over time, resulting in a significant deterioration of the agitation state.
The present invention was devised in view of the above-mentioned circumstances, and provides an anaerobic digestion system and an anaerobic system that can maintain a good stirring state in an anaerobic digestion tank, reduce temperature unevenness of digested sludge, and perform good anaerobic digestion. The purpose is to provide a digestive method.

前記課題を解決するため、第１の本発明の嫌気性消化システムは、処理対象の汚泥が加温される熱交換器と、前記熱交換器で加温された前記汚泥が、嫌気性消化される嫌気性消化槽と、前記嫌気性消化槽で嫌気性消化された消化汚泥を、前記熱交換器で加温される前の前記処理対象の汚泥と合流させる循環手段と、前記熱交換器の上流に設けられる前記処理対象の汚泥を破砕する破砕機と、を備え、前記循環手段は、三方弁と、前記三方弁と前記熱交換器の上流との間を接続する第一管路と、前記三方弁と前記破砕機の上流との間を接続する第二管路とを備えている。 In order to solve the above problems, the anaerobic digestion system of the first invention includes a heat exchanger in which sludge to be treated is heated, and the sludge heated in the heat exchanger is anaerobically digested. an anaerobic digestion tank; a circulation means for combining the digested sludge anaerobically digested in the anaerobic digestion tank with the sludge to be treated before being heated in the heat exchanger; a crusher provided upstream to crush the sludge to be treated; the circulation means includes a three-way valve; and a first pipe line connecting the three-way valve and the upstream side of the heat exchanger; A second pipe line connecting the three-way valve and the upstream side of the crusher is provided.

第２の本発明の嫌気性消化方法は、破砕機と熱交換器と嫌気性消化槽と循環手段と切替手段とを用いて、処理対象の汚泥を嫌気性消化処理する嫌気性消化方法であって、汚泥が前記破砕機で破砕される過程と、前記汚泥が前記熱交換器で加温される過程と、加温された前記汚泥が前記嫌気性消化槽で嫌気性微生物により嫌気性消化される過程と、前記処理対象の汚泥が投入される場合には、前記嫌気性消化槽の消化汚泥が前記循環手段と前記切替手段により、前記破砕機の上流の前記処理対象の汚泥に合流させ前記破砕機、前記熱交換器の順に流れる過程と、前記処理対象の汚泥が投入されず、かつ、前記嫌気性消化槽で固形物の塊りが発生しない場合には、前記嫌気性消化槽の消化汚泥は、前記循環手段と前記切替手段により、前記破砕機に流れることなく前記熱交換器に流れる過程とを含む。 The second anaerobic digestion method of the present invention is an anaerobic digestion method in which sludge to be treated is subjected to anaerobic digestion using a crusher, a heat exchanger, an anaerobic digestion tank, a circulation means, and a switching means. a process in which the sludge is crushed in the crusher, a process in which the sludge is heated in the heat exchanger, and a process in which the heated sludge is anaerobically digested by anaerobic microorganisms in the anaerobic digestion tank. and when the sludge to be treated is input, the digested sludge in the anaerobic digestion tank is combined with the sludge to be treated upstream of the crusher by the circulation means and the switching means. A process in which the sludge flows through the crusher and the heat exchanger in that order, and when the sludge to be treated is not input and no lumps of solid matter are generated in the anaerobic digestion tank, the digestion in the anaerobic digestion tank. The sludge includes a process in which the sludge flows to the heat exchanger without flowing to the crusher by the circulation means and the switching means .

本発明によれば、嫌気性消化槽の撹拌状態を良好に保ち、消化汚泥の温度むらを小さくして、良好な嫌気性消化を行える嫌気性消化システムおよび嫌気性消化方法を提供することができる。 According to the present invention, it is possible to provide an anaerobic digestion system and an anaerobic digestion method that can maintain a good stirring state in an anaerobic digestion tank, reduce temperature unevenness of digested sludge, and perform good anaerobic digestion. .

本発明の実施形態に係る嫌気性消化システムの構成の模式図。1 is a schematic diagram of the configuration of an anaerobic digestion system according to an embodiment of the present invention. 嫌気性消化システムにおいて投入汚泥が投入されるモードの構成を示す図。The figure which shows the structure of the mode in which input sludge is input in an anaerobic digestion system. 嫌気性消化システムにおいて投入汚泥が投入されないモードの構成を示す図。The figure which shows the structure of the mode in which input sludge is not input in an anaerobic digestion system. 嫌気性消化システムにおける嫌気性消化槽の内部で消化汚泥にし渣が多く混入する場合の管路を示す図。FIG. 2 is a diagram showing a pipe line when a large amount of residue is mixed into digested sludge inside an anaerobic digestion tank in an anaerobic digestion system. 変形例の嫌気性消化システムの構成の模式図。Schematic diagram of the configuration of a modified anaerobic digestion system. 従来の下水汚泥の消化設備の模式図。Schematic diagram of conventional sewage sludge digestion equipment.

以下、本発明の実施形態について、適宜図面を参照しながら詳細に説明する。
図１に、本発明の実施形態に係る嫌気性消化システムＳの構成の模式図を示す。
実施形態の嫌気性消化システムＳは、図６に示す初沈汚泥と余剰汚泥とである投入汚泥(処理対象の汚泥)を処理するシステムである。
初沈汚泥は、流入水が最初沈殿池１０２で沈降した汚泥である。
余剰汚泥は、流入水が最初沈殿池１０２、反応槽１０３を通過して最終沈殿池１０４で自然沈降した汚泥である。 Embodiments of the present invention will be described in detail below with reference to the drawings as appropriate.
FIG. 1 shows a schematic diagram of the configuration of an anaerobic digestion system S according to an embodiment of the present invention.
The anaerobic digestion system S of the embodiment is a system that processes input sludge (sludge to be treated) that is initial settled sludge and excess sludge shown in FIG.
First-settled sludge is sludge that is caused by inflow water settling in the first settling tank 102 .
The surplus sludge is sludge obtained by inflow water passing through the first settling tank 102 and the reaction tank 103, and then settling naturally in the final settling tank 104.

なお、投入汚泥(処理対象の汚泥)は、初沈汚泥、余剰汚泥またはそれぞれの濃縮された汚泥の何れかでもよい。
実施形態の嫌気性消化システムＳは、投入汚泥が処理される順に、破砕機１、熱交換器２、および嫌気性消化槽３が管路ｋ１、ｋ２、ｋ３で接続されている。
破砕機１のカッターは、投入汚泥に含まれるし渣等を破砕する。カッターの型式としては、一つのモータで刃を駆動する一軸式と、二つのモータで刃が互いに噛み合う二軸式とがある。投入汚泥のし渣を破砕することで、熱交換器２の詰まりや、後記する嫌気性消化槽３のインペラー４ｉ１、４ｉ２へのし渣の絡み付きが抑制される。 Note that the input sludge (sludge to be treated) may be initial settled sludge, excess sludge, or concentrated sludge.
In the anaerobic digestion system S of the embodiment, a crusher 1, a heat exchanger 2, and an anaerobic digestion tank 3 are connected by pipes k1, k2, and k3 in the order in which input sludge is processed.
The cutter of the crusher 1 crushes residue and the like contained in the input sludge. There are two types of cutters: a single-shaft type in which the blade is driven by one motor, and a two-shaft type in which the blades are driven by two motors that engage with each other. By crushing the sludge from the input sludge, clogging of the heat exchanger 2 and entanglement of the sludge with impellers 4i1 and 4i2 of the anaerobic digestion tank 3, which will be described later, can be suppressed.

熱交換器２は、破砕機１で破砕された投入汚泥を下流の嫌気性消化槽３での消化に適した温度に加温する。破砕機１で破砕された投入汚泥は、熱交換器２で温水と熱交換され加温される。
嫌気性消化槽３では、破砕されかつ加温された汚泥を嫌気性微生物で消化して減容する。嫌気性消化槽３で、投入汚泥の有機固形物のうち約５０％(範囲で示す場合は３０～７０％)が減容される。
嫌気性消化槽３での消化には、約３５～４０℃が適温の中温消化と、約５０～５５℃が適温の高温消化とがある。 The heat exchanger 2 heats the input sludge crushed by the crusher 1 to a temperature suitable for digestion in the downstream anaerobic digestion tank 3. The input sludge crushed by the crusher 1 is heated by exchanging heat with hot water in the heat exchanger 2.
In the anaerobic digestion tank 3, the crushed and heated sludge is digested with anaerobic microorganisms to reduce its volume. In the anaerobic digestion tank 3, about 50% (30 to 70% in range) of the organic solids in the input sludge is reduced in volume.
Digestion in the anaerobic digestion tank 3 includes mesotemperature digestion with a suitable temperature of about 35-40°C and high-temperature digestion with a suitable temperature of about 50-55°C.

中温消化を行う場合は、熱交換器２で破砕された投入汚泥を約３５～４５℃に加温する。
高温消化を行う場合は、熱交換器２で破砕された投入汚泥を約５０～６０℃に加温する。
嫌気性消化槽３には、インペラー型機械撹拌装置４が設けられている。
インペラー型機械撹拌装置４は、インペラー４ｉ１、４ｉ２が軸４ｊに固定されている。軸４ｊは、モータ４ｍで回転駆動される。なお、インペラーの枚数については、型式により異なるが、図１では例として２枚の図としている。
インペラー型機械撹拌装置４は、嫌気性消化槽３内の破砕され加温された投入汚泥を、２枚のインペラー４ｉ１、４ｉ２で撹拌し、温度を均一にする。 When mesothermal digestion is performed, the input sludge crushed in the heat exchanger 2 is heated to about 35 to 45°C.
When performing high-temperature digestion, the input sludge crushed in the heat exchanger 2 is heated to about 50 to 60°C.
The anaerobic digestion tank 3 is provided with an impeller type mechanical stirring device 4.
In the impeller type mechanical stirring device 4, impellers 4i1 and 4i2 are fixed to a shaft 4j. The shaft 4j is rotationally driven by a motor 4m. Although the number of impellers varies depending on the model, FIG. 1 shows two impellers as an example.
The impeller-type mechanical stirring device 4 stirs the crushed and heated input sludge in the anaerobic digestion tank 3 using two impellers 4i1 and 4i2 to make the temperature uniform.

投入汚泥が熱交換器２で加温されることで、嫌気性消化槽３での汚泥の温度が均一化し、嫌気性消化槽３での消化効率が向上する。また、投入汚泥が加温されることで粘性が低下し、嫌気性消化槽３での撹拌が円滑に行える。
嫌気性消化槽３の下部には管路ｋ４が接続されている。嫌気性消化槽３は、管路ｋ４を介して、循環ポンプ５に接続されている。管路ｋ４には、嫌気性消化槽３で消化された消化汚泥を抜き取るための管路ｋ４１が接続されている。嫌気性消化槽３で消化された消化汚泥は、一部がオーバーフローで、嫌気性消化槽３から抜き取られる。 By heating the input sludge in the heat exchanger 2, the temperature of the sludge in the anaerobic digestion tank 3 is made uniform, and the digestion efficiency in the anaerobic digestion tank 3 is improved. Moreover, the viscosity of the input sludge is reduced by heating it, and stirring in the anaerobic digestion tank 3 can be performed smoothly.
A pipe k4 is connected to the lower part of the anaerobic digestion tank 3. The anaerobic digestion tank 3 is connected to the circulation pump 5 via a pipe k4. A pipe k41 for removing the digested sludge digested in the anaerobic digestion tank 3 is connected to the pipe k4. A portion of the digested sludge digested in the anaerobic digestion tank 3 is extracted from the anaerobic digestion tank 3 as an overflow.

嫌気性消化システムＳでは、投入汚泥が投入される場合(投入モード)と、投入汚泥が投入されない場合の何れの場合(非投入モード)にも対応するため、三方弁６等のバルブが設けられている。バルブは、投入汚泥が投入される場合と、投入汚泥が投入されない場合とでの切り替えを可能とする。 In the anaerobic digestion system S, a valve such as a three-way valve 6 is provided in order to cope with both the case where input sludge is input (input mode) and the case where input sludge is not input (non-input mode). ing. The valve enables switching between when input sludge is input and when input sludge is not input.

図１では、バルブとして三方弁６が設けられた場合を示している。以下、バルブとして三方弁６が設けられているとして説明を行う。
そのため、循環ポンプ５は、管路ｋ５を介して三方弁６に接続されている。
三方弁６は、嫌気性消化槽３で嫌気性消化された消化汚泥を破砕機１または熱交換器２に送り、循環させる役割をもつ。 FIG. 1 shows a case where a three-way valve 6 is provided as the valve. The following description will be made assuming that a three-way valve 6 is provided as the valve.
Therefore, the circulation pump 5 is connected to the three-way valve 6 via a conduit k5.
The three-way valve 6 has the role of sending the digested sludge that has been anaerobically digested in the anaerobic digestion tank 3 to the crusher 1 or the heat exchanger 2 for circulation.

そこで、三方弁６は、管路ｋ６を介して、破砕機１の上流の管路ｋ１に接続されている。また、三方弁６は、管路ｋ７を介して、熱交換器２の上流の管路ｋ２に接続されている。投入汚泥が投入されない場合には、三方弁６を用いて、嫌気性消化槽３で消化されつつある消化汚泥が熱交換器２に送られ、循環が行われる。これによって、投入汚泥と消化汚泥中の菌体が嫌気性消化槽３への投入前に混合される。また、温度が高い消化汚泥と高粘度の投入汚泥を混合することで低粘性化し、その混合汚泥を、破砕機１を介して嫌気性消化槽３へ投入することが可能となる。 Therefore, the three-way valve 6 is connected to the conduit k1 upstream of the crusher 1 via the conduit k6. Moreover, the three-way valve 6 is connected to a conduit k2 upstream of the heat exchanger 2 via a conduit k7. When the input sludge is not input, the digested sludge that is being digested in the anaerobic digestion tank 3 is sent to the heat exchanger 2 using the three-way valve 6, and circulation is performed. As a result, the introduced sludge and the bacterial cells in the digested sludge are mixed before being introduced into the anaerobic digestion tank 3. Furthermore, by mixing digested sludge with a high temperature and input sludge with a high viscosity, the viscosity is reduced, and the mixed sludge can be charged into the anaerobic digestion tank 3 via the crusher 1.

＜嫌気性消化システムＳの動作モード＞
次に、嫌気性消化システムＳの動作モードについて説明する。
嫌気性消化システムＳは、投入汚泥が投入される場合(投入モード)（図１の一点鎖線で示す）と、投入汚泥が投入されない場合(非投入モード)（図１の破線で示す）との２つのモードを有している。 <Operating mode of anaerobic digestion system S>
Next, the operation mode of the anaerobic digestion system S will be explained.
The anaerobic digestion system S has two modes: when input sludge is input (input mode) (indicated by the dashed line in Figure 1) and when input sludge is not input (non-input mode) (indicated by the broken line in Figure 1). It has two modes.

図２に嫌気性消化システムＳにおいて投入汚泥が投入されるモードの構成を示し、図３に嫌気性消化システムＳにおいて投入汚泥が投入されないモードの構成を示す。
＜投入汚泥が投入される投入モード＞ FIG. 2 shows the configuration of a mode in which input sludge is input in the anaerobic digestion system S, and FIG. 3 shows a configuration in a mode in which input sludge is not input in the anaerobic digestion system S.
<Input mode in which input sludge is input>

図１の一点鎖線、図２で示す投入汚泥が投入される場合(投入モード)について、説明する。
投入汚泥が投入される投入モードでは、三方弁６は管路ｋ５と管路ｋ６とを接続する。
投入汚泥は、濃縮のため高分子凝集剤が加えられていて粘性が高くなっている。
投入汚泥は、常温で、管路ｋ１を通って、破砕機１に送られる。破砕機１により、投入汚泥のし渣がカッティングされる。カッティングされた投入汚泥は、管路ｋ２を通って、熱交換器２に送られる。カッティングされた投入汚泥は、熱交換器２で温水と熱交換され、嫌気性消化槽３での消化に適した温度になるように加温される。 The case where the input sludge shown by the dashed line in FIG. 1 and the input sludge shown in FIG. 2 is input (input mode) will be explained.
In the input mode in which input sludge is input, the three-way valve 6 connects the conduit k5 and the conduit k6.
The input sludge has a high viscosity because a polymer flocculant is added to it for concentration.
The input sludge is sent to the crusher 1 through the pipe k1 at room temperature. The crusher 1 cuts the residue of the input sludge. The cut input sludge is sent to the heat exchanger 2 through the pipe k2. The cut input sludge is heat exchanged with hot water in a heat exchanger 2, and heated to a temperature suitable for digestion in an anaerobic digestion tank 3.

加温された投入汚泥は、管路ｋ３を通って、嫌気性消化槽３に送られる。
嫌気性消化槽３の投入汚泥は、嫌気性消化槽３において、インペラー型機械撹拌装置４の２枚のインペラー４ｉ１、４ｉ２で撹拌されつつ、嫌気性微生物(メタン菌)で消化される。これにより、メタンガスと二酸化炭素とが発生し、投入汚泥が減容される。
嫌気性消化槽３で消化されつつある消化汚泥は、管路ｋ４を通って、循環ポンプ５に圧送される。消化汚泥は、循環ポンプ５により、圧力を加えられ、管路ｋ５、三方弁６、管路ｋ６を通って、投入汚泥が投入される管路ｋ１に送られる。 The heated input sludge is sent to the anaerobic digestion tank 3 through the pipe k3.
The sludge input to the anaerobic digestion tank 3 is digested by anaerobic microorganisms (methane bacteria) while being stirred by two impellers 4i1 and 4i2 of the impeller type mechanical stirring device 4 in the anaerobic digestion tank 3. As a result, methane gas and carbon dioxide are generated, and the volume of the input sludge is reduced.
Digested sludge being digested in the anaerobic digestion tank 3 is pumped to the circulation pump 5 through a pipe k4. The digested sludge is pressurized by the circulation pump 5 and sent through the pipe k5, the three-way valve 6, and the pipe k6 to the pipe k1 into which the input sludge is introduced.

そして、新たに投入される投入汚泥は、管路ｋ１で、消化汚泥と混合され、破砕機１、熱交換器２、および嫌気性消化槽３の順に送られる。
以後、上述と同様な動作が繰り返される。 The newly introduced sludge is mixed with the digested sludge in the pipe k1 and sent to the crusher 1, the heat exchanger 2, and the anaerobic digestion tank 3 in this order.
Thereafter, operations similar to those described above are repeated.

上述の投入汚泥が投入される投入モードの構成によれば、濃縮のために高分子凝集剤が加えられ粘性が高くなっている投入汚泥を、投入前に循環汚泥(消化汚泥)と混合し (消化汚泥とプレ混合し)、嫌気性消化槽３への投入前に熱交換器２で加温する。これにより、早期にメタン菌と投入汚泥が接触する。また、加温により、投入汚泥が低粘性化され、嫌気性消化槽３の内部での撹拌状態が改善される。また、投入汚泥が消化に適した温度に加温されるので、消化効率が向上する。 According to the configuration of the input mode in which the input sludge is input as described above, the input sludge, which has a high viscosity due to the addition of a polymer flocculant for concentration, is mixed with circulating sludge (digested sludge) before input ( (pre-mixed with digested sludge) and heated in a heat exchanger 2 before being introduced into an anaerobic digestion tank 3. This brings the methane bacteria into contact with the input sludge at an early stage. Moreover, the viscosity of the input sludge is reduced by heating, and the stirring state inside the anaerobic digestion tank 3 is improved. Furthermore, since the input sludge is heated to a temperature suitable for digestion, the efficiency of digestion is improved.

破砕機１により、投入汚泥のし渣を破砕してからの嫌気性消化槽３への投入となるため、し渣のインペラー４ｉ１、４ｉ２への絡みつきが減り、インペラー４ｉ１、４ｉ２の撹拌能力を維持することができる。また、熱交換器２に入る前に、投入汚泥のし渣が破砕機１により破砕されるので、熱交換器２でのし渣による閉塞も軽減できる。
前記したように、従来、投入汚泥をそのまま、熱交換器を通して加温すると熱交換器の伝熱面にワックス状の油分が付着し、熱交換器の閉塞や、熱交換量の不足の起因となっていた。 The crusher 1 crushes the sludge from the input sludge before inputting it to the anaerobic digestion tank 3, which reduces the entanglement of the sludge with the impellers 4i1 and 4i2 and maintains the stirring ability of the impellers 4i1 and 4i2. can do. Moreover, since the sludge of the input sludge is crushed by the crusher 1 before entering the heat exchanger 2, clogging of the heat exchanger 2 by the sludge can be reduced.
As mentioned above, conventionally, when input sludge is passed through a heat exchanger and heated as it is, wax-like oil adheres to the heat transfer surface of the heat exchanger, causing clogging of the heat exchanger and insufficient heat exchange amount. It had become.

これに対して、本実施形態の嫌気性消化システムＳでは、図１の一点鎖線、図２に示すように、投入汚泥が熱交換器２の伝熱面を通過する前に、管路ｋ４、循環ポンプ５、管路ｋ５、三方弁６、管路ｋ６を循環する消化汚泥と混合されて、投入汚泥由来の油分が希釈されている。
また、嫌気性消化槽３の内部で成長したボール状のし渣を、破砕機１に還流させてボール状のし渣を微細化し、嫌気性消化槽３へ返流する。これにより、インペラー４ｉ１、４ｉ２へのし渣の絡みつきによる撹拌機能低下を抑制できる。 On the other hand, in the anaerobic digestion system S of this embodiment, as shown in the dashed line in FIG. 1 and in FIG. The oil derived from the input sludge is diluted by being mixed with the digested sludge circulating through the circulation pump 5, pipe k5, three-way valve 6, and pipe k6.
Further, the ball-shaped residue grown inside the anaerobic digestion tank 3 is returned to the crusher 1 to be pulverized, and the ball-shaped residue is returned to the anaerobic digestion tank 3. Thereby, it is possible to suppress the deterioration of the stirring function due to entanglement of the scum with the impellers 4i1 and 4i2.

＜投入汚泥が投入されない非投入モード＞
図１の破線、図３に示す投入汚泥が投入されない場合(非投入モード)について、説明する。
投入汚泥が投入されない非投入モードでは、三方弁６は管路ｋ５と管路ｋ７とを接続する。
これにより、熱交換器２、嫌気性消化槽３、循環ポンプ５が接続される閉管路が形成される。 <Non-input mode in which input sludge is not input>
The case where the input sludge shown by the broken line in FIG. 1 and FIG. 3 is not input (non-input mode) will be explained.
In the non-input mode in which input sludge is not input, the three-way valve 6 connects the conduit k5 and the conduit k7.
Thereby, a closed pipe line to which the heat exchanger 2, anaerobic digestion tank 3, and circulation pump 5 are connected is formed.

非投入モードでは、嫌気性消化槽３で消化されつつある消化汚泥が、嫌気性消化槽３から、管路ｋ４、循環ポンプ５、管路ｋ５、三方弁６、管路ｋ７、管路ｋ２、熱交換器２、管路ｋ３、嫌気性消化槽３を循環する。
消化汚泥は、熱交換器２を通ることで、嫌気性消化槽３での消化に適した温度に加温される。そのため、嫌気性消化槽３での消化汚泥の消化が促進される。
非投入モードでは、熱交換器２の伝熱面を消化汚泥が通ることで、伝熱面に油分が付着することを抑制できる。 In the non-input mode, the digested sludge being digested in the anaerobic digestion tank 3 is transferred from the anaerobic digestion tank 3 to the pipe k4, the circulation pump 5, the pipe k5, the three-way valve 6, the pipe k7, the pipe k2, It circulates through the heat exchanger 2, pipe k3, and anaerobic digestion tank 3.
The digested sludge passes through the heat exchanger 2 and is heated to a temperature suitable for digestion in the anaerobic digestion tank 3. Therefore, digestion of the digested sludge in the anaerobic digestion tank 3 is promoted.
In the non-input mode, the digested sludge passes through the heat transfer surface of the heat exchanger 2, thereby suppressing oil from adhering to the heat transfer surface.

また、消化汚泥が管路ｋ２、熱交換器２、管路ｋ３、嫌気性消化槽３を循環するので、管路ｋ２、熱交換器２、管路ｋ３、嫌気性消化槽３の洗浄頻度、メンテナンス頻度を低減することができる。 In addition, since the digested sludge circulates through the pipe k2, heat exchanger 2, pipe k3, and anaerobic digestion tank 3, the cleaning frequency of the pipe k2, heat exchanger 2, pipe k3, and anaerobic digestion tank 3, Maintenance frequency can be reduced.

＜嫌気性消化槽３に固形物の塊りが発生した場合＞
次に、嫌気性消化槽３の内部でし渣等による固形物の塊りが発生した場合について、説明する。 <When a lump of solid matter occurs in the anaerobic digestion tank 3>
Next, a case will be described in which a lump of solid matter due to scum or the like occurs inside the anaerobic digestion tank 3.

図４に、嫌気性消化システムＳの嫌気性消化槽３の内部で消化液へのし渣の混入が多い場合の管路を示す。
嫌気性消化槽３の内部で消化液へのし渣の混入が多い場合には、三方弁６は管路ｋ５と管路ｋ６とを接続して、嫌気性消化槽３の消化汚泥を破砕機１に循環させる。
この場合、嫌気性消化槽３で消化されつつある消化汚泥が、嫌気性消化槽３から、管路ｋ４、循環ポンプ５、管路ｋ５、三方弁６、管路ｋ６、管路ｋ１を通り、破砕機１、熱交換器２、嫌気性消化槽３を循環する。 FIG. 4 shows a pipe line when a large amount of persimmonate is mixed into the digestive fluid inside the anaerobic digestion tank 3 of the anaerobic digestion system S.
When there is a large amount of sludge mixed into the digestive fluid inside the anaerobic digestion tank 3, the three-way valve 6 connects the pipe k5 and k6 to transfer the digested sludge in the anaerobic digestion tank 3 to the crusher. Cycle to 1.
In this case, the digested sludge that is being digested in the anaerobic digestion tank 3 passes through the pipe k4, the circulation pump 5, the pipe k5, the three-way valve 6, the pipe k6, and the pipe k1 from the anaerobic digestion tank 3, It circulates through the crusher 1, heat exchanger 2, and anaerobic digestion tank 3.

消化汚泥が破砕機１を通ることで、し渣等が破砕機１で破砕される。そのため、嫌気性消化槽３の内部の固形物の塊りが無くなり、嫌気性消化槽３でのインペラー型機械撹拌装置４のインペラー４ｉ１、４ｉ２による撹拌が滞りなく円滑に行われる。
消化汚泥は、熱交換器２を通ることで、嫌気性消化槽３での消化に適した温度に加温される。そのため、嫌気性消化槽３での消化汚泥の消化が促進される。
また、熱交換器２の伝熱面を破砕された消化汚泥が通ることで、伝熱面に油分が付着することを抑制できる。さらに、熱交換器２の詰まりを抑制できる。 When the digested sludge passes through the crusher 1, the residue and the like are crushed by the crusher 1. Therefore, there are no lumps of solid matter inside the anaerobic digestion tank 3, and stirring by the impellers 4i1 and 4i2 of the impeller-type mechanical stirring device 4 in the anaerobic digestion tank 3 is performed smoothly without any hitch.
The digested sludge passes through the heat exchanger 2 and is heated to a temperature suitable for digestion in the anaerobic digestion tank 3. Therefore, digestion of the digested sludge in the anaerobic digestion tank 3 is promoted.
Furthermore, by passing the crushed digested sludge through the heat transfer surface of the heat exchanger 2, it is possible to suppress oil from adhering to the heat transfer surface. Furthermore, clogging of the heat exchanger 2 can be suppressed.

以上説明した構成によれば、嫌気性消化槽３の撹拌状態を良好に保ち、嫌気性消化槽３内の温度むらを小さくして、良好な嫌気性消化を維持できる嫌気性消化システムＳを得られる。 According to the configuration described above, an anaerobic digestion system S is obtained that can maintain a good stirring state of the anaerobic digestion tank 3, reduce temperature unevenness in the anaerobic digestion tank 3, and maintain good anaerobic digestion. It will be done.

＜変形例＞
図５に、変形例の嫌気性消化システムＳ１の構成の模式図を示す。
変形例の嫌気性消化システムＳ１は、図１に示す実施形態の嫌気性消化システムＳにおける三方弁６を、管路ｋ６の開閉を行う切換え弁７ａと、管路ｋ７の開閉を行う切換え弁７ｂとに置き換えたものである。
その他の構成は、実施形態の構成要素と同じであるから、同一の構成要素には同一の符号を付して示し、詳細な説明は省略する。 <Modified example>
FIG. 5 shows a schematic diagram of the configuration of a modified anaerobic digestion system S1.
The modified anaerobic digestion system S1 replaces the three-way valve 6 in the anaerobic digestion system S of the embodiment shown in FIG. 1 with a switching valve 7a that opens and closes the pipe k6 and a switching valve 7b that opens and closes the pipe k7. It was replaced with .
Since the other configurations are the same as the components of the embodiment, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

変形例の嫌気性消化システムＳ１は、循環ポンプ５の下流に接続される管路ｋ５が、管路ｋ６と管路ｋ７とに分岐されている。
管路ｋ６には、開閉を行う切換え弁７ａが設けられている。管路ｋ７には、開閉を行う切換え弁７ｂが設けられている。
変形例の嫌気性消化システムＳ１において、投入汚泥が投入される場合(投入モード)では、切換え弁７ａが開弁され管路ｋ６が解放されるとともに、切換え弁７ｂが閉弁され管路ｋ７が閉塞される。 In the modified anaerobic digestion system S1, a pipe k5 connected downstream of the circulation pump 5 is branched into a pipe k6 and a pipe k7.
The conduit k6 is provided with a switching valve 7a that opens and closes. The conduit k7 is provided with a switching valve 7b that opens and closes.
In the modified anaerobic digestion system S1, when input sludge is input (input mode), the switching valve 7a is opened and the pipe k6 is released, and the switching valve 7b is closed and the pipe k7 is opened. Obstructed.

これにより、嫌気性消化槽３の消化汚泥は、嫌気性消化槽３の下流の循環ポンプ５に接続される管路ｋ５、管路ｋ６を通って、管路ｋ１に流れ、投入汚泥と合流する。
上記変形例の構成によれば、実施形態の投入モードと同様な作用効果を奏する。
一方、変形例の嫌気性消化システムＳ１において、投入汚泥が投入されない場合(非投入モード)では、切換え弁７ａが閉弁され管路ｋ６が閉塞されるとともに、切換え弁７ｂが開弁され管路ｋ７が解放される。 As a result, the digested sludge in the anaerobic digestion tank 3 flows into the pipe k1 through the pipe k5 and k6 connected to the circulation pump 5 downstream of the anaerobic digestion tank 3, and joins with the input sludge. .
According to the configuration of the above modification, the same effects as the input mode of the embodiment are achieved.
On the other hand, in the modified anaerobic digestion system S1, when the input sludge is not input (non-input mode), the switching valve 7a is closed and the pipeline k6 is blocked, and the switching valve 7b is opened and the pipeline k6 is blocked. k7 is released.

これにより、嫌気性消化槽３の消化汚泥は、嫌気性消化槽３の下流の循環ポンプ５に接続される管路ｋ５、管路ｋ７を通って、管路ｋ２に流れ、熱交換器２に送られ、加温される。
この構成によれば、実施形態の非投入モードと同様な作用効果を奏する。
また、嫌気性消化槽３に固形物の塊りが発生した場合には、切換え弁７ａが開弁され管路ｋ６が解放されるとともに、切換え弁７ｂが閉弁され管路ｋ７が閉塞される。これにより、嫌気性消化槽３の消化汚泥が破砕機１に循環され、破砕機１で破砕される。 As a result, the digested sludge in the anaerobic digestion tank 3 flows through the pipe k5 and k7, which are connected to the circulation pump 5 downstream of the anaerobic digestion tank 3, to the pipe k2, and then to the heat exchanger 2. sent and heated.
According to this configuration, the same effects as the non-throwing mode of the embodiment are achieved.
In addition, when a lump of solid matter occurs in the anaerobic digestion tank 3, the switching valve 7a is opened and the pipe k6 is released, and the switching valve 7b is closed and the pipe k7 is blocked. . Thereby, the digested sludge in the anaerobic digestion tank 3 is circulated to the crusher 1 and crushed by the crusher 1.

＜＜その他の実施形態＞＞
１．前記実施形態、変形例では、三方弁６または切換え弁７ａ、７ｂを用いて、嫌気性消化槽３の消化汚泥を管路ｋ１または管路ｋ２に切り替えて流す例を説明したが、その他の機械要素を用いて切り替えてもよい。 <<Other embodiments>>
1. In the embodiments and modifications described above, the three-way valve 6 or the switching valves 7a and 7b are used to switch the digested sludge in the anaerobic digestion tank 3 to the pipe k1 or k2. You may also switch using elements.

２．本発明は前記の実施形態、変形例に限られるものではなく、特許請求の範囲で様々な形態が含まれる。前記の実施形態は本発明をわかり易く説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。 2. The present invention is not limited to the embodiments and modifications described above, and includes various forms within the scope of the claims. The embodiments described above have been described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.

１ 破砕機
２ 熱交換器
３ 嫌気性消化槽
５ 循環ポンプ(循環手段)
６ 三方弁(循環手段、切り替え手段)
７ａ、７ｂ 切換え弁(循環手段、切り替え手段)
１０４ 最終沈殿池
ｋ４、ｋ５、ｋ６、ｋ７ 管路(循環手段)
Ｓ、Ｓ１ 嫌気性消化システム 1 Crusher 2 Heat exchanger 3 Anaerobic digestion tank 5 Circulation pump (circulation means)
6 Three-way valve (circulation means, switching means)
7a, 7b switching valve (circulation means, switching means)
104 Final settling tank k4, k5, k6, k7 Pipes (circulation means)
S, S1 Anaerobic digestion system

Claims (10)

処理対象の汚泥が加温される熱交換器と、
前記熱交換器で加温された前記汚泥が、嫌気性消化される嫌気性消化槽と、
前記嫌気性消化槽で嫌気性消化された消化汚泥を、前記熱交換器で加温される前の前記処理対象の汚泥と合流させる循環手段と、
前記熱交換器の上流に設けられる前記処理対象の汚泥を破砕する破砕機と、を備え、
前記循環手段は、三方弁と、前記三方弁と前記熱交換器の上流との間を接続する第一管路と、
前記三方弁と前記破砕機の上流との間を接続する第二管路とを
備えていることを特徴とする嫌気性消化システム。 A heat exchanger that heats the sludge to be treated;
an anaerobic digestion tank in which the sludge heated by the heat exchanger is anaerobically digested;
circulation means for combining the digested sludge that has been anaerobically digested in the anaerobic digestion tank with the sludge to be treated before being heated in the heat exchanger ;
a crusher provided upstream of the heat exchanger to crush the sludge to be treated,
The circulation means includes a three-way valve, a first pipe line connecting the three-way valve and an upstream side of the heat exchanger,
a second pipe line connecting between the three-way valve and the upstream side of the crusher;
An anaerobic digestion system. 請求項１に記載の嫌気性消化システムにおいて、
前記処理対象の汚泥が投入される場合には、
前記嫌気性消化槽の前記消化汚泥を、前記三方弁と前記第二管路を介して前記破砕機の上流の前記処理対象の汚泥に合流させて前記破砕機、前記熱交換器の順に流すことを特徴とする嫌気性消化システム。 The anaerobic digestion system according to claim 1,
When the sludge to be treated is inputted,
The digested sludge in the anaerobic digestion tank is combined with the sludge to be treated upstream of the shredder through the three-way valve and the second pipe, and is passed through the shredder and the heat exchanger in that order. An anaerobic digestion system featuring: 請求項１に記載の嫌気性消化システムにおいて、
前記処理対象の汚泥が投入されず、かつ、前記嫌気性消化槽で固形物の塊りが発生しない場合には、
前記嫌気性消化槽の前記消化汚泥を、前記破砕機に流すことなく、前記三方弁から前記第一管路を介して前記熱交換器に流すことを特徴とする嫌気性消化システム。 The anaerobic digestion system according to claim 1 ,
If the sludge to be treated is not input and no solid lumps are generated in the anaerobic digestion tank,
An anaerobic digestion system characterized in that the digested sludge in the anaerobic digestion tank is flowed from the three-way valve to the heat exchanger via the first pipe line without flowing to the crusher. 請求項１に記載の嫌気性消化システムにおいて、
前記処理対象の汚泥が投入されず、かつ、前記嫌気性消化槽で固形物の塊りが発生する場合には、
前記嫌気性消化槽の前記消化汚泥を、前記三方弁と前記第二管路を介して前記破砕機、前記熱交換器の順に流すことを特徴とする嫌気性消化システム。 The anaerobic digestion system according to claim 1 ,
If the sludge to be treated is not input and solid lumps occur in the anaerobic digestion tank,
An anaerobic digestion system characterized in that the digested sludge in the anaerobic digestion tank is passed through the crusher and the heat exchanger in this order via the three-way valve and the second pipe line. 処理対象の汚泥が加温される熱交換器と、
前記熱交換器で加温された前記汚泥が、嫌気性消化される嫌気性消化槽と、
前記嫌気性消化槽で嫌気性消化された消化汚泥を、前記熱交換器で加温される前の前記 処理対象の汚泥と合流させる循環手段と、
前記熱交換器の上流に設けられる前記処理対象の汚泥を破砕する破砕機と、を備え、
前記循環手段は、前記熱交換器の上流に接続される管路に設けられ、当該管路の開閉を行う第１切換え弁と、
記破砕機の上流に接続される管路に設けられ、当該管路の開閉を行う第２切換え弁とを 備えていることを特徴とする嫌気性消化システム。 A heat exchanger that heats the sludge to be treated;
an anaerobic digestion tank in which the sludge heated by the heat exchanger is anaerobically digested;
circulation means for combining the digested sludge that has been anaerobically digested in the anaerobic digestion tank with the sludge to be treated before being heated in the heat exchanger;
a crusher provided upstream of the heat exchanger to crush the sludge to be treated,
The circulation means is provided in a pipe line connected upstream of the heat exchanger, and includes a first switching valve that opens and closes the pipe line;
An anaerobic digestion system characterized by comprising: a second switching valve that is provided in a pipe line connected upstream of the crusher and opens and closes the pipe line . 請求項５に記載の嫌気性消化システムにおいて、
前記処理対象の汚泥が投入される場合には、
前記第１切換え弁は閉弁するとともに前記第２切換え弁は開弁し、前記嫌気性消化槽の前記消化汚泥を、前記破砕機の上流の前記処理対象の汚泥に合流させて前記破砕機、前記熱交換器の順に流すことを特徴とする嫌気性消化システム。 The anaerobic digestion system according to claim 5,
When the sludge to be treated is inputted,
The first switching valve is closed and the second switching valve is opened, and the digested sludge in the anaerobic digestion tank is merged with the sludge to be treated upstream of the crusher, and the crusher An anaerobic digestion system characterized in that the flow is performed in the order of the heat exchanger . 請求項５に記載の嫌気性消化システムにおいて、 The anaerobic digestion system according to claim 5,
前記処理対象の汚泥が投入されず、かつ、前記嫌気性消化槽で固形物の塊りが発生しない場合には、If the sludge to be treated is not input and no solid lumps are generated in the anaerobic digestion tank,
前記第１切換え弁は開弁するとともに前記第２切換え弁は閉弁し、 The first switching valve is opened and the second switching valve is closed,
前記嫌気性消化槽の前記消化汚泥を、前記破砕機に流すことなく前記熱交換器に流すことを特徴とする嫌気性消化システム。An anaerobic digestion system characterized in that the digested sludge in the anaerobic digestion tank is passed through the heat exchanger without being passed through the crusher. 請求項５に記載の嫌気性消化システムにおいて、The anaerobic digestion system according to claim 5,
前記処理対象の汚泥が投入されず、かつ、前記嫌気性消化槽で固形物の塊りが発生する場合には、If the sludge to be treated is not input and solid lumps occur in the anaerobic digestion tank,
前記第１切換え弁は閉弁するとともに前記第２切換え弁は開弁し、 The first switching valve is closed and the second switching valve is opened,
前記嫌気性消化槽の前記消化汚泥を、前記破砕機、前記熱交換器の順に流すことを特徴とする嫌気性消化システム。 An anaerobic digestion system characterized in that the digested sludge in the anaerobic digestion tank is passed through the crusher and the heat exchanger in this order. 破砕機と熱交換器と嫌気性消化槽と循環手段と切替手段とを用いて、処理対象の汚泥を嫌気性消化処理する嫌気性消化方法であって、
汚泥が前記破砕機で破砕される過程と、
前記汚泥が前記熱交換器で加温される過程と、
加温された前記汚泥が前記嫌気性消化槽で嫌気性微生物により嫌気性消化される過程と、
前記処理対象の汚泥が投入される場合には、前記嫌気性消化槽の消化汚泥が前記循環手段と前記切替手段により、前記破砕機の上流の前記処理対象の汚泥に合流され前記破砕機、前記熱交換器の順に流れる過程と、
前記処理対象の汚泥が投入されず、かつ、前記嫌気性消化槽で固形物の塊りが発生しない場合には、前記嫌気性消化槽の消化汚泥は、前記循環手段と前記切替手段により、前記破砕機に流れることなく前記熱交換器に流れる過程と
を含む
ことを特徴とする嫌気性消化方法。 An anaerobic digestion method for anaerobically digesting sludge to be treated using a crusher, a heat exchanger, an anaerobic digestion tank, a circulation means, and a switching means,
a process in which sludge is crushed by the crusher;
a process in which the sludge is heated in the heat exchanger;
a process in which the heated sludge is anaerobically digested by anaerobic microorganisms in the anaerobic digestion tank;
When the sludge to be treated is input, the digested sludge in the anaerobic digestion tank is combined with the sludge to be treated upstream of the crusher by the circulation means and the switching means, and the sludge is added to the sludge to be treated upstream of the crusher. The process of flowing in order of heat exchanger,
When the sludge to be treated is not input and no solid lumps are generated in the anaerobic digestion tank, the digested sludge in the anaerobic digestion tank is controlled by the circulation means and the switching means. a process of flowing to the heat exchanger without flowing to the crusher; and
including
An anaerobic digestion method characterized by : 請求項９に記載の嫌気性消化方法において、The anaerobic digestion method according to claim 9,
前記処理対象の汚泥が投入されず、かつ、前記嫌気性消化槽で固形物の塊りが発生する場合には、前記嫌気性消化槽の消化汚泥は、前記循環手段と前記切替手段により、前記破砕機と前記熱交換器の順に流れる過程とを含むWhen the sludge to be treated is not inputted and a lump of solid matter is generated in the anaerobic digestion tank, the digested sludge in the anaerobic digestion tank is controlled by the circulation means and the switching means. a crusher and a process in which the heat exchanger flows in sequence;
ことを特徴とする嫌気性消化方法。An anaerobic digestion method characterized by:
JP2020005969A 2020-01-17 2020-01-17 Anaerobic digestion systems and methods Active JP7446821B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2020005969A JP7446821B2 (en) 2020-01-17 2020-01-17 Anaerobic digestion systems and methods

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2020005969A JP7446821B2 (en) 2020-01-17 2020-01-17 Anaerobic digestion systems and methods

Publications (2)

Publication Number Publication Date
JP2021112699A JP2021112699A (en) 2021-08-05
JP7446821B2 true JP7446821B2 (en) 2024-03-11

Family

ID=77076383

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2020005969A Active JP7446821B2 (en) 2020-01-17 2020-01-17 Anaerobic digestion systems and methods

Country Status (1)

Country Link
JP (1) JP7446821B2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005144280A (en) 2003-11-13 2005-06-09 Fuji Electric Holdings Co Ltd Methane fermentation treatment method
JP2007098228A (en) 2005-09-30 2007-04-19 Kurita Water Ind Ltd Method and apparatus for treatment of organic waste
JP2012254426A (en) 2011-06-10 2012-12-27 Tsukishima Kikai Co Ltd Apparatus for methane fermentation of biomass
JP2018167258A (en) 2017-03-29 2018-11-01 住友重機械エンバイロメント株式会社 Digestion facility
JP2018167170A (en) 2017-03-29 2018-11-01 住友重機械エンバイロメント株式会社 Digestion facility

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005144280A (en) 2003-11-13 2005-06-09 Fuji Electric Holdings Co Ltd Methane fermentation treatment method
JP2007098228A (en) 2005-09-30 2007-04-19 Kurita Water Ind Ltd Method and apparatus for treatment of organic waste
JP2012254426A (en) 2011-06-10 2012-12-27 Tsukishima Kikai Co Ltd Apparatus for methane fermentation of biomass
JP2018167258A (en) 2017-03-29 2018-11-01 住友重機械エンバイロメント株式会社 Digestion facility
JP2018167170A (en) 2017-03-29 2018-11-01 住友重機械エンバイロメント株式会社 Digestion facility

Also Published As

Publication number Publication date
JP2021112699A (en) 2021-08-05

Similar Documents

Publication Publication Date Title
US9771292B2 (en) Treatment of waste products with anaerobic digestion
EP3280685B1 (en) Treatment of waste products with anaerobic digestion
KR100787074B1 (en) Apparatus of biogas production for organic waste
CN106103362B (en) Continuous thermal hydrolysis method for sludge with high dryness
JP7440575B2 (en) Digestion equipment
US11021381B2 (en) Two stage anaerobic digestion with intermediate hydrolysis
JP7446821B2 (en) Anaerobic digestion systems and methods
KR102029117B1 (en) Anaerobic digestion apparatus for treating organic waste using the thermal hydrolysis
US10647605B2 (en) Method and device for the treatment of organic matter, involving recirculation of digested sludge
CN109476520B (en) Improved flocculation reagent assisted sludge dewatering method and apparatus for carrying out such method
CN105753147B (en) A kind of controllable double-cycling anaerobic reactor and application
KR100306228B1 (en) The method for process and stock raising of aparatus
JP2003117526A (en) Biogasification treating method for organic waste
JP4641271B2 (en) Fermenter charging method and processing apparatus for organic substance-containing liquid
JP5441787B2 (en) Organic wastewater treatment method and treatment apparatus
JP4945035B2 (en) Methane gas generation system
CN217921803U (en) Quenching and tempering and energy recovery system are reinforceed to municipal administration mud
JP2013086005A (en) Method and apparatus for treating organic waste
KR200175419Y1 (en) Aparatus for stock raising
JPH10113700A (en) Method for slurrying organic sludge and device therefor
CN114804408A (en) Method and device for treating and recycling water washing waste liquid of power plant gas turbine
JP2023154136A (en) Medium-temperature methane fermentation processing apparatus and method for operating medium-temperature methane fermentation processing apparatus
Oliver et al. Anaerobic Digestion at Spruce Haven Farm

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20221118

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20230823

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20230905

A601 Written request for extension of time

Free format text: JAPANESE INTERMEDIATE CODE: A601

Effective date: 20231101

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20231221

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20240213

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20240228

R150 Certificate of patent or registration of utility model

Ref document number: 7446821

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150