JP4080774B2 - Organic waste treatment apparatus and method - Google Patents

Organic waste treatment apparatus and method Download PDF

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Publication number
JP4080774B2
JP4080774B2 JP2002100393A JP2002100393A JP4080774B2 JP 4080774 B2 JP4080774 B2 JP 4080774B2 JP 2002100393 A JP2002100393 A JP 2002100393A JP 2002100393 A JP2002100393 A JP 2002100393A JP 4080774 B2 JP4080774 B2 JP 4080774B2
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organic waste
methane fermentation
vacuum drying
volatile components
methane
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JP2003290753A (en
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良安 岡庭
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Sumitomo Heavy Industries Ltd
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Sumitomo Heavy Industries Ltd
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    • 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

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  • Treatment Of Sludge (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、有機性廃棄物をメタン発酵処理する処理装置および方法に関し、特に、排出される固形分、処理汚泥の処理装置および方法に関する。
【０００２】
【従来の技術】
有機性廃棄物の処理方法として廃棄物をメタン発酵槽内で発酵処理する処理方法が広く用いられている。この処理結果として得られる消化汚泥は、脱水・乾燥後に発酵させて堆肥化させる処理方法がとられている。
【０００３】
特開平８−１１９８号公報には、こうした技術の一例であり、消化汚泥を真空中で乾燥し、発生する低温蒸気を汚泥の昇温用熱源として、また、メタン発酵で発生したメタンガスを真空乾燥用熱源として用いるものである。
【０００４】
【発明が解決しようとする課題】
消化汚泥は、含水率が高く、しかもアンモニア等の窒素分を多く含んでいるため、そのまま真空乾燥したのでは、水分が多すぎて処理効率が悪い。また、大量に排出される処理水の脱窒処理を行う必要があり、処理設備の大型化を招いてしまう。
【０００５】
そこで、本発明は乾燥および排水処理の効率を高めることが可能な有機性廃棄物の処理装置および処理方法を提供することを課題とする。
【０００６】
【課題を解決するための手段】
上記課題を解決するため、本発明に係る有機性廃棄物の処理装置は、メタン発酵槽を用いて有機性廃棄物をメタン発酵処理する有機性廃棄物の処理装置において、有機性廃棄物を破砕・脱水して固形物を分離することで、メタン発酵槽に導く液状物を取り出す前処理装置と、この前処理装置で分離された固形物と、メタン発酵槽の処理汚泥の混合物を真空乾燥させる真空乾燥装置と、この真空乾燥装置から排出される揮発成分および水分を凝縮させる凝縮器と、この凝縮器で凝縮された液と蒸気を接触させて揮発成分を濃縮させる濃縮器と、をさらに備えるものである。
【０００７】
一方、本発明に係る有機性廃棄物の処理方法は、メタン発酵槽を用いて有機性廃棄物をメタン発酵処理する有機性廃棄物の処理方法において、有機性廃棄物を破砕・脱水して固形物を分離する工程と、固形物を分離した液状物をメタン発酵槽で発酵処理する工程と、分離した固形物とメタン発酵槽の処理汚泥とを混合して真空乾燥する工程と、真空乾燥で排出された揮発成分および水分を凝縮させる工程と、凝縮液と蒸気とを接触させて揮発成分を濃縮させる工程と、を備えるものである。
【０００８】
本発明によれば、発酵に不適当として前処理工程で分離された固形物と処理汚泥とを混合することで、処理汚泥の含水率を低下させることができるので、真空乾燥の効率を向上させることができる。真空乾燥では、アンモニア等の揮発成分は水分とともに汚泥から除去されるが、こうして得られたアンモニア等の揮発成分を含む凝縮水に蒸気を接触させることで揮発成分を蒸発させて、水分から分離し、濃縮することができる。これにより、排水から窒素分を除去することができるので、その処理が容易かつ簡便になる。
【０００９】
処理装置は、濃縮器を通過した排水で真空乾燥装置に投入される固形物を予熱する加熱装置をさらに備えていることが好ましい。一方、処理方法は、濃縮工程を通過した排水で真空乾燥前の固形物を予熱する工程をさらに備えていることが好ましい。このようにすると、真空乾燥時のエネルギーを削減することができ、好ましい。
【００１０】
【発明の実施の形態】
以下、添付図面を参照して本発明の好適な実施の形態について詳細に説明する。説明の理解を容易にするため、各図面において同一の構成要素に対しては可能な限り同一の参照番号を附し、重複する説明は省略する。
【００１１】
図１は、本発明に係る有機性廃棄物の処理装置の第１の実施形態を示すブロック構成図である。この処理装置は、メタン発酵を行うメタン発酵槽２を中心とした処理装置である。
【００１２】
メタン発酵槽２の前処理側には、前処理装置１が、後処理側には、真空乾燥装置３、凝縮器４、濃縮器５、堆肥化装置６が設けられている。ここで、前処理装置１は、被処理物（家庭から排出される生ごみ等の有機性廃棄物）を破砕・脱水する装置であり、例えば、竪型回転破砕機とスクリュープレス型脱水機により構成される。
【００１３】
真空乾燥装置３は、導入された被乾燥物を加熱しつつ、減圧して乾燥させる装置であり、前処理装置１の脱水固形物排出ラインと、メタン発酵槽２の消化汚泥排出ラインに接続されている。凝縮器４は、真空乾燥装置３と図示していない排ガス処理装置の間の排ガスライン上に配置され、排ガスを冷却して凝縮液を得る装置である。濃縮器５には蒸気が導入され、凝縮液から濃排液と排水を得るものであり、排水ラインは図示していない水処理装置へと接続される。真空乾燥装置３の下流には乾燥固形物を所定の条件下で発酵させる堆肥化装置６が接続されている。
【００１４】
次に、本装置における廃棄物処理、つまり本発明に係る有機性廃棄物の処理方法を具体的に説明する。
【００１５】
まず、被処理物は、前処理装置１へ送られ、破砕・脱水処理されることで脱水固形物と脱水分離液とに分離される。そして、有機物を含む脱水分離液のみがメタン発酵槽２に送られる。
【００１６】
メタン発酵槽２内では、脱水分離液中の高分子有機物が消化菌により低分子有機物へと分解される液化過程と、低分子有機物が揮発性脂肪酸を経てプロピオン酸や酢酸、蟻酸等を生成する酸生成過程と、プロピオン酸、酢酸、蟻酸等がメタンにガス化されるガス生成過程の３過程によりメタンガスが生成され、回収される。
【００１７】
こうして生成されたメタンガスは、図示していない脱硫工程等で処理された後、ガスホルダーに貯留されて、ボイラー等の熱源の燃焼源として使用される。
【００１８】
メタン発酵の方法としては、３７〜３８℃で発酵を行う中温発酵法と、５３〜５４℃で発酵を行う高温発酵法とがあるが、本実施形態では、後述する真空乾燥を好適に行うために、発酵温度の高い高温発酵法を採用することが好ましい。
【００１９】
前処理装置１から排出される脱水固形物と、メタン発酵槽２で処理された発酵処理液とは、ともに真空乾燥装置３に導入される。そして、約５０〜６０℃に加熱されつつ、約−９０ｋＰａ(大気圧基準)に減圧されて脱水・乾燥される。得られる乾燥物の含水率は、真空乾燥装置３内における滞留時間により調整可能であり、また、加熱により約５０〜６０℃に維持することで、堆肥化のための一次発酵を兼ねることができる。このため、後述する堆肥化装置６を小型化することが可能となる。さらに、含水率の低い脱水固形物を発酵処理液と混合することでメタン発酵汚泥の含水率を下げることができるので、メタン発酵汚泥の脱水のために高価な凝集剤を使用することなく、高い乾燥効率を得ることができるので、処理コストを低減できる。
【００２０】
真空乾燥装置３から排出されるガスは凝縮器４へ送られ、冷却されることにより、凝縮液が得られる。前述したように、真空乾燥装置３では、約５０〜６０℃、約−９０ｋＰａの条件下で乾燥しているので、真空乾燥装置３から排出されるガス中には、高沸点の有機物は含有されず、低沸点の有機物と水分のみが含有されている。さらに、アンモニア等の揮発成分も蒸発するが、これらは凝縮液に捕集される。このため、排ガス処理装置へと送られる排ガス中に含まれる有機物・揮発成分の量を加熱乾燥の場合に比べて低減できる。
【００２１】
得られた凝縮水は、濃縮器５内で蒸気と接触させることにより、揮発成分を蒸発させて分離し、これを再び凝縮させることで濃縮させ、アンモニア濃度の高い濃縮排液を得る。凝縮器から排出される排水は液化した蒸気とともに温水として排出され、図示していない排水処理装置へと送られ、処理される。この排水からはアンモニアが除去され、窒素分が低減されているので、水処理を簡略化することが可能である。この蒸気をメタン発酵槽２で得られたメタンを燃料源とするボイラーで生成すると、処理コストを削減することができ、好ましい。得られた濃排液は、高濃度のアンモニアを含有しているため、液体肥料等として利用できる。
【００２２】
真空乾燥装置３で乾燥された乾燥固形物は堆肥化装置６へと送られ、２次発酵を経て堆肥として利用できる。なお、前処理装置１で得られる脱水固形分の量が発酵処理液の量に比べて多い場合には、その一部を直接、堆肥化装置６へと導いてもよい。
【００２３】
図２は、本発明に係る有機性廃棄物の処理装置の第２の実施形態を示すブロック構成図である。この装置は、図１に示される第１の実施形態と基本構成は同一であって、濃縮器５を通過した温水と、真空乾燥装置３に導かれる脱水固形物・発酵処理液との間で熱交換を行う加熱装置７を配置している点が相違する。
【００２４】
メタン発酵槽２から排出される発酵処理液の温度は、高温発酵法の場合には真空乾燥装置３内の温度に近いものの、中温発酵法の場合には、これより低く、脱水固形物については、いずれの場合でも真空乾燥装置３内の温度より低く、加熱を行う必要がある。これに対して、濃縮器５から排出される温排水の温度は８０〜９０℃にできるため、この温排水で少なくとも脱水固形物を加熱することで、真空乾燥装置３内の温度維持に必要なエネルギーを削減し、設備の運転コストを低減することができる。
【００２５】
以上の説明では、いずれも真空乾燥装置３内に導入する前に脱水固形物と発酵処理液とを混合する例を説明してきたが、脱水固形物と発酵処理液を真空乾燥装置３内で乾燥前に混合してもよい。また、混合しながら乾燥を行ってもよい。
【００２６】
【発明の効果】
以上説明したように本発明によれば、メタン発酵の前処理で得られた発酵処理には不適当な脱水固形物とメタン発酵処理液とを混合して真空乾燥することで高価な凝集剤を用いることなく、効率よく乾燥を行うことができるとともに、乾燥時に高沸点成分が排出されず、排出される低沸点成分と水分とを凝縮させるのが容易であり、排ガス処理も簡素化できる。さらに、凝縮液中からアンモニア等の揮発成分を濃縮分離することで、排水処理も容易になるほか、アンモニアの回収も容易になる。
【図面の簡単な説明】
【図１】本発明に係る有機性廃棄物の処理装置の第１の実施形態を示すブロック構成図である。
【図２】本発明に係る有機性廃棄物の処理装置の第２の実施形態を示すブロック構成図である。
【符号の説明】
１…前処理装置、２…メタン発酵槽、３…真空乾燥装置、４…凝縮器、５…濃縮器、６…堆肥化装置、７…加熱装置。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a processing apparatus and method for methane fermentation treatment of organic waste, and more particularly to a processing apparatus and method for discharged solids and treated sludge.
[0002]
[Prior art]
As a method for treating organic waste, a treatment method for fermenting waste in a methane fermentation tank is widely used. The digested sludge obtained as a result of this treatment is fermented after being dehydrated and dried and composted.
[0003]
JP-A-8-1198 discloses an example of such a technique, in which digested sludge is dried in a vacuum, generated low-temperature steam is used as a heat source for heating up sludge, and methane gas generated in methane fermentation is vacuum-dried. It is used as a heat source.
[0004]
[Problems to be solved by the invention]
Digested sludge has a high moisture content and also contains a large amount of nitrogen such as ammonia. Therefore, if it is vacuum-dried as it is, it has too much moisture and the processing efficiency is poor. Moreover, it is necessary to perform the denitrification process of the treated water discharged | emitted in large quantities, and the enlargement of a processing facility will be caused.
[0005]
Then, this invention makes it a subject to provide the processing apparatus and processing method of organic waste which can raise the efficiency of drying and waste water treatment.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, an organic waste processing apparatus according to the present invention is an organic waste processing apparatus for methane fermentation of organic waste using a methane fermentation tank.・ Dehydrating and separating solids, vacuum-dry the mixture of the pretreatment device that extracts the liquid material that leads to the methane fermentation tank, the solid material separated by this pretreatment device, and the treated sludge of the methane fermentation tank A vacuum dryer; a condenser that condenses the volatile components and moisture discharged from the vacuum dryer; and a concentrator that contacts the liquid condensed in the condenser with steam to concentrate the volatile components. Is.
[0007]
On the other hand, the organic waste processing method according to the present invention is an organic waste processing method in which an organic waste is processed by methane fermentation using a methane fermentation tank. A step of separating the solid, a step of fermenting the liquid separated from the solid in a methane fermenter, a step of mixing the separated solid and the treated sludge of the methane fermenter and vacuum drying, and vacuum drying. A step of condensing the discharged volatile component and moisture, and a step of bringing the condensate and steam into contact to concentrate the volatile component.
[0008]
According to the present invention, the moisture content of the treated sludge can be reduced by mixing the solids and the treated sludge separated in the pretreatment step as inappropriate for fermentation, so that the efficiency of vacuum drying is improved. be able to. In vacuum drying, volatile components such as ammonia are removed from the sludge together with moisture, but the volatile components are evaporated and separated from moisture by bringing the vapor into contact with condensed water containing volatile components such as ammonia thus obtained. Can be concentrated. Thereby, since a nitrogen content can be removed from waste water, the process becomes easy and simple.
[0009]
It is preferable that the processing device further includes a heating device that preheats the solid matter that is put into the vacuum drying device with the wastewater that has passed through the concentrator. On the other hand, it is preferable that the processing method further includes a step of preheating the solid before vacuum drying with the wastewater that has passed through the concentration step. This is preferable because energy during vacuum drying can be reduced.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same reference numerals are given to the same components in the drawings as much as possible, and duplicate descriptions are omitted.
[0011]
FIG. 1 is a block diagram showing a first embodiment of an organic waste processing apparatus according to the present invention. This processing apparatus is a processing apparatus centering on the methane fermentation tank 2 which performs methane fermentation.
[0012]
A pretreatment device 1 is provided on the pretreatment side of the methane fermentation tank 2, and a vacuum drying device 3, a condenser 4, a concentrator 5, and a composting device 6 are provided on the posttreatment side. Here, the pretreatment device 1 is a device that crushes and dehydrates an object to be treated (organic waste such as garbage discharged from a household). For example, the pretreatment device 1 includes a vertical rotary crusher and a screw press type dehydrator. Composed.
[0013]
The vacuum drying device 3 is a device that heats the introduced material to be dried while reducing the pressure, and is connected to the dehydrated solids discharge line of the pretreatment device 1 and the digested sludge discharge line of the methane fermentation tank 2. ing. The condenser 4 is an apparatus that is disposed on an exhaust gas line between the vacuum drying device 3 and an exhaust gas treatment device (not shown) and obtains a condensate by cooling the exhaust gas. Steam is introduced into the concentrator 5 to obtain concentrated drainage and drainage from the condensate, and the drainage line is connected to a water treatment device (not shown). A composting device 6 for fermenting the dried solid matter under predetermined conditions is connected downstream of the vacuum drying device 3.
[0014]
Next, the waste processing in this apparatus, that is, the organic waste processing method according to the present invention will be described in detail.
[0015]
First, the object to be processed is sent to the pretreatment device 1 and is crushed and dehydrated to be separated into dehydrated solids and dehydrated separation liquid. Then, only the dehydrated separation liquid containing organic substances is sent to the methane fermentation tank 2.
[0016]
In the methane fermentation tank 2, a liquefaction process in which high-molecular organic substances in the dehydrated separation liquid are decomposed into low-molecular organic substances by digestive bacteria, and the low-molecular organic substances generate propionic acid, acetic acid, formic acid, etc. via volatile fatty acids. Methane gas is generated and recovered through three processes: an acid generation process and a gas generation process in which propionic acid, acetic acid, formic acid, and the like are gasified into methane.
[0017]
The methane gas generated in this way is processed in a desulfurization step (not shown), and then stored in a gas holder and used as a combustion source for a heat source such as a boiler.
[0018]
As a method of methane fermentation, there are an intermediate temperature fermentation method in which fermentation is performed at 37 to 38 ° C and a high temperature fermentation method in which fermentation is performed at 53 to 54 ° C. In this embodiment, vacuum drying described later is suitably performed. In addition, it is preferable to employ a high-temperature fermentation method having a high fermentation temperature.
[0019]
Both the dehydrated solid matter discharged from the pretreatment device 1 and the fermentation treatment liquid treated in the methane fermentation tank 2 are introduced into the vacuum drying device 3. Then, while being heated to about 50 to 60 ° C., the pressure is reduced to about −90 kPa (atmospheric pressure standard), followed by dehydration and drying. The moisture content of the obtained dried product can be adjusted by the residence time in the vacuum drying apparatus 3, and can also serve as primary fermentation for composting by maintaining at about 50 to 60 ° C. by heating. . For this reason, it becomes possible to miniaturize the composting apparatus 6 mentioned later. Furthermore, since the moisture content of methane fermentation sludge can be lowered by mixing dehydrated solids with low moisture content with the fermentation treatment liquid, it is high without using expensive flocculants for dehydration of methane fermentation sludge. Since drying efficiency can be obtained, processing costs can be reduced.
[0020]
The gas discharged from the vacuum drying device 3 is sent to the condenser 4 and cooled to obtain a condensate. As described above, the vacuum drying device 3 is dried under the conditions of about 50 to 60 ° C. and about −90 kPa. Therefore, the gas discharged from the vacuum drying device 3 contains high-boiling organic substances. Only low-boiling organic substances and moisture are contained. Furthermore, volatile components such as ammonia also evaporate, but these are collected in the condensate. For this reason, the amount of organic matter / volatile components contained in the exhaust gas sent to the exhaust gas treatment device can be reduced as compared with the case of heat drying.
[0021]
The obtained condensed water is brought into contact with steam in the concentrator 5 to evaporate and separate volatile components, and is condensed again by condensation to obtain a concentrated effluent having a high ammonia concentration. The waste water discharged from the condenser is discharged as warm water together with the liquefied vapor, sent to a waste water treatment device (not shown), and processed. Since the ammonia is removed from the waste water and the nitrogen content is reduced, the water treatment can be simplified. When this steam is generated by a boiler using methane obtained in the methane fermentation tank 2 as a fuel source, the processing cost can be reduced, which is preferable. Since the obtained concentrated drainage contains high concentration of ammonia, it can be used as liquid fertilizer and the like.
[0022]
The dried solid material dried by the vacuum drying device 3 is sent to the composting device 6 and can be used as compost through secondary fermentation. In addition, when there is much quantity of the dehydration solid content obtained with the pre-processing apparatus 1 compared with the quantity of a fermentation processing liquid, you may lead that part directly to the composting apparatus 6. FIG.
[0023]
FIG. 2 is a block diagram showing a second embodiment of the organic waste processing apparatus according to the present invention. This apparatus has the same basic configuration as that of the first embodiment shown in FIG. 1, and is between the hot water that has passed through the concentrator 5 and the dehydrated solid matter / fermentation treatment liquid that is guided to the vacuum drying apparatus 3. The difference is that a heating device 7 for heat exchange is arranged.
[0024]
The temperature of the fermentation treatment liquid discharged from the methane fermentation tank 2 is close to the temperature in the vacuum drying apparatus 3 in the case of the high temperature fermentation method, but is lower in the case of the medium temperature fermentation method. In any case, it is necessary to perform heating at a temperature lower than the temperature in the vacuum dryer 3. On the other hand, since the temperature of the warm waste water discharged from the concentrator 5 can be 80 to 90 ° C., it is necessary to maintain the temperature in the vacuum dryer 3 by heating at least the dehydrated solids with this warm waste water. Energy can be reduced and the operating cost of equipment can be reduced.
[0025]
In the above description, an example in which the dehydrated solid and the fermentation treatment liquid are mixed before introduction into the vacuum drying apparatus 3 has been described. However, the dehydrated solid and the fermentation treatment liquid are dried in the vacuum drying apparatus 3. It may be mixed before. Moreover, you may dry, mixing.
[0026]
【The invention's effect】
As described above, according to the present invention, an expensive flocculant can be obtained by mixing a dehydrated solid suitable for fermentation treatment obtained in the pretreatment of methane fermentation with a methane fermentation treatment liquid and vacuum drying. Without using it, it is possible to efficiently dry, high-boiling components are not discharged during drying, it is easy to condense discharged low-boiling components and moisture, and exhaust gas treatment can be simplified. Further, by concentrating and separating volatile components such as ammonia from the condensate, wastewater treatment is facilitated and ammonia can be easily recovered.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of an organic waste processing apparatus according to the present invention.
FIG. 2 is a block diagram showing a second embodiment of the organic waste processing apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pretreatment apparatus, 2 ... Methane fermenter, 3 ... Vacuum drying apparatus, 4 ... Condenser, 5 ... Concentrator, 6 ... Composting apparatus, 7 ... Heating apparatus.

Claims (4)

メタン発酵槽を用いて有機性廃棄物をメタン発酵処理する有機性廃棄物の処理装置において、
有機性廃棄物を破砕・脱水して固形物を分離することで、前記メタン発酵槽に導く液状物を取り出す前処理装置と、
前記前処理装置で分離された固形物と、前記メタン発酵槽の処理汚泥の混合物を真空乾燥させる真空乾燥装置と、
前記真空乾燥装置から排出される揮発成分および水分を凝縮させる凝縮器と、
前記凝縮器で凝縮された液と蒸気を接触させて揮発成分を濃縮させる濃縮器と、
をさらに備える有機性廃棄物の処理装置。In organic waste processing equipment that uses methane fermentation tanks to treat organic waste with methane fermentation,
A pretreatment device for taking out the liquid material led to the methane fermentation tank by crushing and dewatering organic waste to separate solids;
A vacuum drying apparatus for vacuum drying a mixture of the solid matter separated in the pretreatment apparatus and the treated sludge of the methane fermentation tank;
A condenser for condensing volatile components and moisture discharged from the vacuum dryer;
A concentrator for concentrating volatile components by contacting the liquid condensed in the condenser with steam;
An organic waste processing apparatus. 前記濃縮器を通過した排水で前記真空乾燥装置に投入される固形物を加熱する加熱装置をさらに備えている請求項１記載の有機性廃棄物の処理装置。The processing apparatus of the organic waste of Claim 1 further equipped with the heating apparatus which heats the solid substance thrown into the said vacuum dryer with the waste_water | drain which passed through the said concentrator. メタン発酵槽を用いて有機性廃棄物をメタン発酵処理する有機性廃棄物の処理方法において、
有機性廃棄物を破砕・脱水して固形物を分離する工程と、
固形物を分離した液状物をメタン発酵槽で発酵処理する工程と、
分離した固形物とメタン発酵槽の処理汚泥とを混合して真空乾燥する工程と、
前記真空乾燥で排出された揮発成分および水分を凝縮させる工程と、
凝縮液と蒸気とを接触させて揮発成分を濃縮させる工程と、
を備える有機性廃棄物の処理方法。In the organic waste processing method of methane fermentation treatment of organic waste using a methane fermenter,
Crushing and dewatering organic waste to separate solids;
A step of fermenting the liquid material from which the solid material has been separated in a methane fermentation tank;
Mixing the separated solids with the treated sludge of the methane fermentation tank and vacuum drying;
A step of condensing volatile components and moisture discharged by the vacuum drying;
Concentrating the volatile components by contacting the condensate and steam;
A method for treating organic waste. 前記濃縮工程を通過した排水で真空乾燥前の固形物を予熱する工程をさらに備えている請求項３記載の有機性廃棄物の処理方法。The processing method of the organic waste of Claim 3 further equipped with the process of pre-heating the solid substance before vacuum drying with the waste_water | drain which passed through the said concentration process.
JP2002100393A 2002-04-02 2002-04-02 Organic waste treatment apparatus and method Expired - Fee Related JP4080774B2 (en)

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