JPS63240995A - Apparatus for biological treatment of organic waste water - Google Patents
Apparatus for biological treatment of organic waste waterInfo
- Publication number
- JPS63240995A JPS63240995A JP62074140A JP7414087A JPS63240995A JP S63240995 A JPS63240995 A JP S63240995A JP 62074140 A JP62074140 A JP 62074140A JP 7414087 A JP7414087 A JP 7414087A JP S63240995 A JPS63240995 A JP S63240995A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- tank
- filtering part
- treated water
- screen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000010815 organic waste Substances 0.000 title abstract 2
- 239000010802 sludge Substances 0.000 claims abstract description 37
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 239000007921 spray Substances 0.000 claims abstract description 8
- 230000001590 oxidative effect Effects 0.000 claims abstract 3
- 230000003647 oxidation Effects 0.000 claims description 14
- 238000007254 oxidation reaction Methods 0.000 claims description 14
- 239000002351 wastewater Substances 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 6
- 244000005700 microbiome Species 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 2
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 abstract description 5
- 238000005406 washing Methods 0.000 abstract description 3
- 238000005276 aerator Methods 0.000 abstract 3
- 241001148470 aerobic bacillus Species 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005273 aeration Methods 0.000 description 10
- 239000007788 liquid Substances 0.000 description 6
- 230000001954 sterilising effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Activated Sludge Processes (AREA)
Abstract
Description
【発明の詳細な説明】
ａ）産業上の利用分野
本発明は従来からある活性汚泥装置の改良に関するもの
で、沈澱池や返送汚泥装置の不要な、効率的な装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION a) Field of Industrial Application The present invention relates to an improvement of a conventional activated sludge system, and relates to an efficient system that does not require a settling tank or a return sludge system.
ｂ）従来の技術
従来から利用されている、有機性廃水の生物学的処理方
法の代表的なものは活性汚泥法が挙げられるが、これに
は次の３つの間重点がある。b) Prior Art A typical biological treatment method for organic wastewater that has been used in the past is the activated sludge method, which focuses on the following three points.
（イ）有機性廃水企生物学的酸化処理、１１１（＠気槽
）で酸化処理した後、処理水を得る為に沈澱槽を設置す
る必要があること。然し活性汚泥は比重が１−に近いの
で処理水と分離しＫくく、表面積の大きな沈澱槽の設置
が必要である。(b) Organic wastewater biological oxidation treatment: After oxidation treatment in 111 (@air tank), it is necessary to install a settling tank to obtain treated water. However, since activated sludge has a specific gravity close to 1-1, it is difficult to separate from the treated water, and a settling tank with a large surface area must be installed.
（ロ）処理水を得る為曝気槽から活性汚泥を含んだ液を
沈澱槽に移送させるため、曝気槽内の汚泥濃度（ＭＬＳ
Ｓ ）が減少するので、沈澱槽で分離した汚泥を返送汚
泥として曝気槽に戻さなければならない。此に費用がか
＼る。(b) In order to transfer the liquid containing activated sludge from the aeration tank to the settling tank to obtain treated water, the sludge concentration (MLS) in the aeration tank is
S) decreases, so the sludge separated in the settling tank must be returned to the aeration tank as return sludge. This costs money.
（ハ）従来の方法では活性汚泥の比重が１に近いので沈
澱槽で分離濃、縮される汚泥濃度も高いものが得られず
、曝気槽内のＭＬＳＳは精々３，０００ 〜ｓ、ｏｏｏ
ｐｐｍが限度とされていた。こうなると有機廃水の処
理負荷にも自づと限度が生じ、曝気槽内のＭＬＳＳの増
加が急務となった。(c) In the conventional method, since the specific gravity of activated sludge is close to 1, it is not possible to obtain a high concentration of sludge that is separated and concentrated in the settling tank, and the MLSS in the aeration tank is at most 3,000 ~ s, ooo
The limit was ppm. This naturally placed a limit on the processing load of organic wastewater, and it became an urgent need to increase the amount of MLSS in the aeration tank.
Ｃ）発明が解決しようとする間１ｍ点
本発明では、この様な問題点を解決する為に、曝気槽内
て、濾過部（５）という装置を新しく取ｐ付け、処理さ
れた液は、此処を通る事によって清澄な処理水が潜られ
汚泥は洗浄された後に剥離され、又曝気槽へ戻る様にし
此に依って、沈澱槽や沈澱池の要らない又返送汚泥の必
要のない且つ曝気槽内のＭＬＳＳ を高濃度に保つこ
との出来る装置を提供するものである。C) 1m point while the invention is trying to solve the problem In the present invention, in order to solve such problems, a new device called a filtration part (5) is installed in the aeration tank, and the treated liquid is By passing through this area, clear treated water is submerged, and the sludge is washed and separated, and then returned to the aeration tank. This eliminates the need for a sedimentation tank or sedimentation tank, and eliminates the need for return sludge, and also eliminates the need for aeration. The purpose of the present invention is to provide a device that can maintain a high concentration of MLSS in a tank.
ｄ）問題点を解決するための手段
本発明による装置の１例の断面図を第１図に示し、此に
基づいてその構成を説明しよう。生物学的酸化処理槽（
１）には好気性微生物が存在し、そのＭＬＳＳ＠度は少
なくとも１０，０００１ｇ／Ｚ以上て維持されている。d) Means for solving the problem A sectional view of an example of the device according to the present invention is shown in FIG. 1, and its construction will be explained based on this. Biological oxidation treatment tank (
In 1), aerobic microorganisms are present, and the MLSS@ degree is maintained at at least 10,0001 g/Z or higher.
空気導入管（２）の端部には散気部（６）が付設され、
微細空気が放出され、酸化処理）？ＩＪ（１）内に絶え
ず酸素を供給すると共に槽内の攪拌が行われる。廃水導
入管（４）からは有機性廃水が流入し、槽内では微生物
と酸素の作用で廃水中の有機物は酸化され活性汚泥のフ
ロックが発生し廃水は浄化される。以上は活性汚泥法の
曝気槽と同じであるが、本発明では酸化処理槽（１）の
中に濾過部（５）が設置されているのがｌ特徴である。An air diffuser (6) is attached to the end of the air introduction pipe (2),
Fine air is released and oxidation treatment)? Oxygen is constantly supplied into the IJ (1) and the tank is stirred. Organic wastewater flows in from the wastewater introduction pipe (4), and in the tank, the organic matter in the wastewater is oxidized by the action of microorganisms and oxygen, and flocs of activated sludge are generated, thereby purifying the wastewater. The above is the same as the aeration tank of the activated sludge method, but the present invention is characterized in that a filtration section (5) is installed in the oxidation treatment tank (1).
濾過部（５）は円筒形で、両側の蓋の中心（（回転軸（
６ａ） （６ｂ）がそれぞれ酸化処理槽（１）の壁を通
して付設される。軸シール（７）で槽内の液が出ない様
になっている。回転軸の１つ（６ａ）は中空で、濾過部
（５）の内部と連通され、処理水の出口ともなっている
。此の濾過部（５）は回転軸（６ａ）（６ｂ）を軸とし
て回転する。濾過部（５）の円筒面は、超微細スクリー
ンの網で出来ておる。此のスクリーンの目開きは、０．
００５〜０．０２ｆｆｉｌｌｌ の、網が好しい。The filtration part (5) is cylindrical, and the center of both lids ((rotation axis)
6a) (6b) are respectively attached through the wall of the oxidation treatment tank (1). The shaft seal (7) prevents the liquid in the tank from coming out. One of the rotating shafts (6a) is hollow, communicates with the inside of the filtration part (5), and also serves as an outlet for treated water. This filter section (5) rotates around rotating shafts (6a) and (6b). The cylindrical surface of the filter section (5) is made of an ultra-fine screen mesh. The aperture of this screen is 0.
A net of 0.005 to 0.02 ffill is preferred.
又スクリーンは金属又は合成樹脂製である。濾過部（５
）は回転しながら、スクリーンの目から、液を吸い込み
汚泥は網でヂされ、液はＳＳの殆んどない処理水が回転
軸（６ａ）を通り、処理水管（８）を下って処理水槽（
９）に入り、処理水出口（１０）よシ系外に排出される
。Moreover, the screen is made of metal or synthetic resin. Filtration section (5
) sucks in the liquid through the mesh of the screen while rotating, the sludge is filtered through the screen, and the treated water, which has almost no SS, passes through the rotating shaft (6a) and flows down the treated water pipe (8) to the treated water tank. (
9) and is discharged out of the system through the treated water outlet (10).
洗浄管（１１）が中空な回転軸（６ａ）の中を通って濾
過部（５）の内部へ挿入され、上向きに構成されその先
端にスプレーノズル（１２）が付設されている。処理水
の１部とポンプ（１３）で送り紫外線殺菌設備（１４）
を通過させて洗浄管（１１ルに供給される。スプレーは
濾過部（５）が回転するに連れ、スクリーンが空中て出
た時内面側からスプレーして網目の詰まるのを防ぐ。A cleaning tube (11) is inserted into the filter section (5) through a hollow rotating shaft (6a), is configured to face upward, and has a spray nozzle (12) attached to its tip. A portion of the treated water is sent to the ultraviolet sterilization equipment (14) using a pump (13).
is passed through and supplied to the cleaning pipe (11).As the filtration part (5) rotates, when the screen comes out into the air, the spray is sprayed from the inner side to prevent the mesh from clogging.
第２図は第１図のＡ−Ａ断面図で濾過部（５）の内部に
付設されたスプレーノズル（１２）の詳細を示したもの
で、スプレーノズル（１２）の方向ハ、 濾過部（５）
の回転方向と反対に垂直方向に対して４０°〜４５°の
角度が望しい。斯くして洗浄された汚泥は剥離され再び
酸化処理−ＴＰ！Ｊ（１）に戻シ汚泥＠ 庶（ＭＬ Ｓ
Ｓ ）を増加させる。汚泥濃度が極端建上昇する時は
汚泥排出管（１６）のパルプを開き汚泥を排出する。尚
以上説明した中で濾過部（５）の回転軸（６ａ） （６
ｂ）は（６ａ）文中空軸としたが両方共る。Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, showing the details of the spray nozzle (12) attached to the inside of the filtration part (5). 5)
An angle of 40° to 45° with respect to the vertical direction opposite to the direction of rotation is preferred. The thus washed sludge is peeled off and oxidized again - TP! Return the sludge to J(1) @ 庶(ML S
S). When the sludge concentration rises to an extreme level, the pulp of the sludge discharge pipe (16) is opened to discharge the sludge. In addition, in the above explanation, the rotating shaft (6a) (6
b) is (6a) with the blank axis in the sentence, but both are the same.
尚第３図は本発明の他の実施例を示す装置で、２個の濾
過部（５）を設けたものである。FIG. 3 shows an apparatus showing another embodiment of the present invention, which is provided with two filtration sections (5).
ｅ）作用
活性汚泥が生育する酸化処理層（１）に廃水流入管（４
）から有機廃水を流入させ、且つ空気導入管（２）を経
て散気部（３）から微細気泡を噴出させることによって
、有機物を分解し生物処理を行わせる。e) A wastewater inflow pipe (4) is connected to the oxidation treatment layer (1) where active sludge grows.
), and microbubbles are ejected from the air diffuser (3) through the air introduction pipe (2) to decompose organic matter and perform biological treatment.
濾過部（５）は少くとも５０ ’、ｈが液に浸漬した状
態で回転し、網（１５）が汚泥中に浸漬している間だ汚
泥から清澄水丈を分離取水し、濾過部（５）の内部から
中空回転軸（６ａ）を４経てすみやかに排出される。此
は酸化処理槽（１）と濾過槽（５）内の液の水位差（ヘ
ッド）に依って行われる。濾過てよって網の表面に付着
した汚泥は、濾過面が空中に露出した時点でスプレーノ
ズル（１２）から処理水の１部を噴射させ、表面の汚泥
を剥離させることによって濾過洗浄を連続的に行うこと
が出来る。この場合、処理水が如何（で清澄水であって
も、多くの閑が存在しており、長期間洗浄水として使用
すれば、網の目及び配管に生物が繁殖し目づまりを起こ
すことになる。その為洗浄水は紫外線殺菌設備（１４）
に通し殺菌させることによって、これを防止するのであ
る。The filtration part (5) rotates with at least 50' h immersed in the liquid, and while the net (15) is immersed in the sludge, clear water is separated and taken out from the sludge. ) is quickly discharged from the inside of the tube through the hollow rotating shaft (6a). This is carried out depending on the water level difference (head) between the liquid in the oxidation treatment tank (1) and the filtration tank (5). The sludge that adheres to the surface of the net due to filtration is removed by spraying a portion of the treated water from the spray nozzle (12) when the filtration surface is exposed to the air, and the sludge on the surface is peeled off, thereby continuously cleaning the filtration. It can be done. In this case, no matter how clear the treated water is, there is still a lot of dead water, and if it is used as cleaning water for a long time, organisms will breed in the mesh and pipes, causing clogging. .For this reason, the washing water is treated with ultraviolet sterilization equipment (14).
This can be prevented by sterilizing the food by passing it through the water.
殺菌には塩素１次亜塩素酸ンーダ、オゾン等が一般に使
用されているが、何れも残留効果があるため酸化処理槽
（１）内の微生物までも死滅させる。For sterilization, chlorine, hypochlorite, ozone, etc. are generally used, but since they all have a residual effect, they kill even the microorganisms in the oxidation treatment tank (1).
紫外線はそれがなく網の目づま９丈を防止し且つ取り扱
いが簡単な利点がある。It has the advantage of being free from ultraviolet rays, preventing mesh clogging, and being easy to handle.
ｆ）実施例
第１表は本発明の装置を使用して、廃水を処理した時の
成績を示したもので試料としてＢＯＤ２００ｘｇ／ｌ
ＣＯＤ ９０ ｍ９ｍｍの合成下水を調製し廃水処理の
実験全行った。濾過部網目の開きは０．０１１１１１濾
過面積は０．０２８ｍ”であった。f) Example Table 1 shows the results when wastewater was treated using the apparatus of the present invention, and the sample was BOD200xg/l.
Synthetic sewage with a COD of 90 m and 9 mm was prepared and all experiments on wastewater treatment were conducted. The opening of the filter mesh was 0.011111, and the filtration area was 0.028 m''.
ｇ−） 発明の効果
イ）活性汚泥法を実施するに当り沈澱槽又は沈澱池と必
要としないのみならず又返送汚泥の設備が要らないから
設備費が軽減され、又設置面精が縮少される。g-) Effects of the invention a) When implementing the activated sludge method, not only no sedimentation tank or sedimentation tank is required, but also equipment for returning sludge is not required, which reduces equipment costs and reduces installation costs. be done.
口）酸化処理槽内の汚泥濃度を高く保つことが出来るの
で、ＢＯＤ容積負荷を高くすることが出来高効率でコン
パクト化が出来る。Since the sludge concentration in the oxidation treatment tank can be kept high, the BOD volumetric load can be increased and the system can be made more compact with high efficiency.
ハ）超微部スクリーン全通して処理水が潜られるから、
ＳＳの少いＢＯＤの微量な清澄水が得られる。C) Because the treated water can penetrate through the entire ultra-fine screen,
Clear water with low SS and a trace amount of BOD can be obtained.
二）装置が簡単で、操作も容易自動化が出来るので熟練
全便しない。2) The device is simple, easy to operate, and can be automated, so it doesn't require much skill.
ホ）網目の洗浄に紫外線で処理した処理水を使用するの
で、微生物によって網目が詰まることなく長期間汚泥を
涙すことが出来る。e) Since treated water treated with ultraviolet rays is used to clean the mesh, sludge can be washed away for a long period of time without the mesh being clogged by microorganisms.
へ）従来の活性汚泥の装置に簡単ｉ／）取り付けること
が出来る。f) Can be easily installed in conventional activated sludge equipment.
第１図は本発明てよる装置の１例の断面線図であシ第２
図は第１図のＡ−Ａ断面図である。
第３図は本発明による他の装置の１例の断面線図である
。
主要なる部分を示す符号の説明
１・・・酸化処理槽 ２・・・空気導入管 ６・・・散
気部４・・・廃水導入管 ５・・・濾過部 ６ａ ６ｂ
・・・回転軸７・・・軸シール ８・・・処理水流出管
９・・・処理水槽１０・・・処理水出口 １１・・・
洗浄管 １２・・・スプレーノズル １ろ・・・ポンプ
１４・・・紫外線殺菌設備１５・・・超微、′＠スク
リーン １６・・・汚泥排出管。
特許出願人 三菱化工機沫式会社
代理人 （７１６７）弁理士服部賢武
第３図FIG. 1 is a cross-sectional diagram of an example of the device according to the present invention.
The figure is a sectional view taken along the line AA in FIG. 1. FIG. 3 is a cross-sectional diagram of an example of another device according to the present invention. Explanation of symbols indicating main parts 1...Oxidation treatment tank 2...Air introduction pipe 6...Aeration section 4...Wastewater introduction pipe 5...Filtering section 6a 6b
... Rotating shaft 7 ... Shaft seal 8 ... Treated water outflow pipe 9 ... Treated water tank 10 ... Treated water outlet 11 ...
Washing pipe 12...Spray nozzle 1 filter...Pump 14...Ultraviolet sterilization equipment 15...Ultra fine,'@screen 16...Sludge discharge pipe. Patent Applicant: Mitsubishi Kakoki Kashiki Company Agent (7167) Patent Attorney Kentake Hattori Figure 3
Claims (1)
理する装置において、酸化処理槽（１）の壁を貫通して
、回転可能に該壁に軸着され、円筒面に超微細な目を持
つたスクリーンを備えた円筒形の濾過部（５）を設け、
その濾過部（５）の内部に通づる中空軸を通して、紫外
線で照射された 処理水を前記スクリーン内面にスプレーする洗浄装置が
濾過部（５）の内部へ挿入されており、処理水流出管（
８）が中空軸と連結しており、 且つ酸化処理槽（１）には汚泥排出管（１６）が設けら
れたことを特徴とする有機性廃水の生物学的処理装置。 ２）濾過部（５）の超微細スクリーンの目開きが０．０
０５〜０．０２ｍｍの網で、金属又は合成樹脂製である
特許請求の範囲第１項記載の有機性廃水の生物学的処理
装置。 ３）濾過部内の洗浄装置のスプレーノズルはドラムの回
転方向とは逆方向に垂直方向と４０°〜４５°傾斜して
いる特許請求の範囲第１項の記載の有機性廃水の生物学
的処理装置。[Claims] 1) In an apparatus for biologically oxidizing organic wastewater using aerobic microorganisms, the oxidation treatment tank (1) has a cylindrical structure that penetrates the wall of the oxidation treatment tank (1) and is rotatably attached to the wall. A cylindrical filter section (5) equipped with a screen with ultra-fine eyes on the surface is provided,
A cleaning device that sprays treated water irradiated with ultraviolet light onto the inner surface of the screen is inserted into the filtration section (5) through a hollow shaft that passes through the inside of the filtration section (5).
8) is connected to a hollow shaft, and the oxidation treatment tank (1) is provided with a sludge discharge pipe (16). 2) The opening of the ultra-fine screen in the filtration section (5) is 0.0.
2. The biological treatment device for organic wastewater according to claim 1, wherein the net has a diameter of 0.05 to 0.02 mm and is made of metal or synthetic resin. 3) The biological treatment of organic wastewater according to claim 1, wherein the spray nozzle of the cleaning device in the filtration section is inclined at 40° to 45° with respect to the vertical direction in a direction opposite to the rotating direction of the drum. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62074140A JPS63240995A (en) | 1987-03-30 | 1987-03-30 | Apparatus for biological treatment of organic waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62074140A JPS63240995A (en) | 1987-03-30 | 1987-03-30 | Apparatus for biological treatment of organic waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63240995A true JPS63240995A (en) | 1988-10-06 |
Family
ID=13538576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62074140A Pending JPS63240995A (en) | 1987-03-30 | 1987-03-30 | Apparatus for biological treatment of organic waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63240995A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003266094A (en) * | 2002-03-13 | 2003-09-24 | Hideken Sekkei:Kk | Anaerobic digestion tank and operation method therefor |
-
1987
- 1987-03-30 JP JP62074140A patent/JPS63240995A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003266094A (en) * | 2002-03-13 | 2003-09-24 | Hideken Sekkei:Kk | Anaerobic digestion tank and operation method therefor |
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