JP2818856B2 - Microbial control method for filtration biofilm - Google Patents
Microbial control method for filtration biofilmInfo
- Publication number
- JP2818856B2 JP2818856B2 JP7166116A JP16611695A JP2818856B2 JP 2818856 B2 JP2818856 B2 JP 2818856B2 JP 7166116 A JP7166116 A JP 7166116A JP 16611695 A JP16611695 A JP 16611695A JP 2818856 B2 JP2818856 B2 JP 2818856B2
- Authority
- JP
- Japan
- Prior art keywords
- pumice
- biofilm
- filter medium
- filtration
- water
- 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.)
- Expired - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Filtration Of Liquid (AREA)
- Biological Treatment Of Waste Water (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、浮遊藻類を含む水を濾
過装置で濾過する際に生ずる濾材表面の微生物膜が捕捉
した浮遊藻類の分解を遅延又は微生物膜の菌体網を緻密
にする方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for delaying the decomposition of suspended algae captured by a microorganism membrane on the surface of a filter medium, which is generated when water containing suspended algae is filtered by a filtration device, or increasing the density of a microbial membrane. About the method.
【０００２】[0002]
【従来の技術】湖沼で増殖した浮遊藻類を濾過する水質
浄化方法の改善された手段として、本発明者等が先に出
願した軽石を濾過材とした軽石濾過装置を発明した（特
願平6-45944号）。この装置を使用して浮遊藻類を含む
水を濾過し処理する場合、軽石表面は微細なひだ状にな
っているが、その表面に糸状菌や放線菌が付着して軽石
の表面に網状に広がる。そして湖水に含まれる浮遊藻類
は軽石表面に形成された糸状菌を主とした細菌の網に捕
捉される。水温が15℃〜25℃の範囲内においては、自然
のままにしておいても、生物膜の糸状菌が適正に働き、
無機態のリンや窒素等の栄養塩を溶出することがなく浮
遊藻類が効率良く捕捉される。しかし、水温が概ね25℃
以上の場合は、糸状菌が著しく活発となり定期的に行な
われる軽石層の洗浄までに、捕捉した浮遊藻類を分解
し、処理水に無機態のリンや窒素等を栄養塩を溶出して
しまう。また、水温が概ね15℃以下の場合は、糸状菌が
不活発となり、糸状菌を中心とした菌体網が容易に形成
されず浮遊藻類の捕捉がされ難くなる。2. Description of the Related Art As an improved means for purifying water algae grown in lakes and marshes, the present inventors have invented a pumice filter device using pumice as a filter material, which was previously filed by the present inventors (Japanese Patent Application No. Hei 6 (1994) -108). -45944). When filtering and treating water containing suspended algae using this device, the surface of the pumice is in the form of fine pleats, but filamentous fungi and actinomycetes adhere to the surface and spread in a net-like manner on the surface of the pumice. . The suspended algae contained in the lake water are captured by a bacterial net mainly composed of filamentous fungi formed on the surface of the pumice stone. When the water temperature is in the range of 15 ° C to 25 ° C, even if it is left as it is, the fungus of the biofilm works properly,
Floating algae are efficiently captured without eluting nutrients such as inorganic phosphorus and nitrogen. However, the water temperature is about 25 ° C
In the case described above, the filamentous fungi become remarkably active, and the suspended floating algae are decomposed and the nutrients such as inorganic phosphorus and nitrogen are eluted in the treated water before the washing of the pumice layer which is periodically performed. In addition, when the water temperature is about 15 ° C. or lower, the filamentous fungi become inactive, and a bacterial cell network centered on the filamentous fungus is not easily formed, so that it is difficult to trap floating algae.
【０００３】[0003]
【発明が解決しようとする課題】本発明は上記の軽石濾
過において、水温が25℃以上になっても、生物膜の糸状
菌の働きを抑制させ、水温が15℃以下になっても、生物
膜の糸状菌の働きを活発にさせることによって、高温時
には捕捉した浮遊藻類を分解することを遅延して無機態
の栄養塩の溶出を防止し、低温時には生物膜の菌体網を
緻密にして浮遊藻類の除去効果を向上する方法を提供す
るものである。SUMMARY OF THE INVENTION The present invention relates to the above-mentioned pumice filtration, which suppresses the action of filamentous fungi on the biofilm even when the water temperature is 25 ° C. or higher, and reduces By activating the action of filamentous fungi on the membrane, it delays the decomposition of trapped algae at high temperatures to prevent the elution of inorganic nutrients, while at low temperatures the biofilm membrane of the biofilm becomes denser. It is intended to provide a method for improving the effect of removing suspended algae.
【０００４】[0004]
【課題を解決するための手段】本発明者は、上記課題を
解決するため鋭意研究の結果、高温時において濾過材で
ある軽石又は人工濾材表面に拮抗微生物を予め付着させ
た軽石又は人工濾材を使用したところ、無機態の栄養塩
の溶出を抑制し、低温時において異なる拮抗微生物を用
いたところ、生物膜による浮遊藻類の除去効果を向上す
る方法を見出し本発明を完成した。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. When they were used, elution of inorganic nutrients was suppressed, and when different antagonistic microorganisms were used at low temperatures, a method for improving the removal effect of suspended algae by a biofilm was found, and the present invention was completed.
【０００５】本発明は、軽石又は人工濾材を主体とした
浮遊藻類を含む水を濾過する軽石又は人工濾材濾過装置
において、軽石又は人工濾材の表面に拮抗微生物を付着
して、この表面に生成される生物膜に捕捉された浮遊藻
類の分解を遅延又は浮遊藻類の除去効果を向上すること
を特徴とする濾過装置における濾過生物膜の微生物制御
方法である。The present invention relates to a pumice or artificial filter medium filtration apparatus for filtering water containing suspended algae mainly composed of pumice or an artificial filter medium, wherein an antagonistic microorganism adheres to the surface of the pumice or the artificial filter medium and is formed on this surface. The present invention relates to a method for controlling microorganisms in a filtration biofilm in a filtration device, which comprises delaying the decomposition of floating algae captured by the biofilm and improving the effect of removing the floating algae.
【０００６】本発明に使用される軽石濾過装置は軽石又
は人工濾材を濾過材として使用した装置全般に用いるこ
とができるが、好適には本発明者等によって、先に発明
された特願平6-45944号に記載の湖沼の表層水が流入さ
れる流入口を有する濾過層を具備し、この濾過層には前
記流入口の下方において、多孔部材によって支持され
て、前記表層水中の浮遊藻類を濾過して除去する軽石層
が装填されており、多孔部材の下部に処理水受部が設け
られている装置が使用される。[0006] The pumice filter used in the present invention can be used for all devices using pumice or an artificial filter medium as a filter medium. Preferably, the pumice filter apparatus was previously invented by the present inventors. No.-45944, comprising a filter layer having an inlet into which surface water of the lake described in No. 45 is introduced, and the filter layer is supported by a porous member below the inlet to remove floating algae in the surface water. An apparatus in which a pumice layer to be removed by filtration is loaded and a treated water receiving portion is provided below the porous member is used.
【０００７】本発明に使用する、拮抗微生物は、光合成
細菌、放線菌、糸状菌及び担子菌が中心に入っている
が、糸状菌の働きを抑制させたい場合と、糸状菌の働き
を活発にさせたい場合とでは、微生物の構成比が異な
る。糸状菌の働きを抑制させたい場合は、光合成細菌が
多く含まれ、それを捕食する放線菌が増殖し、濾材表面
では放線菌が優占となり糸状菌の働きを抑制させる。糸
状菌の働きを活発にさせたい場合は、光合成細菌を少な
くし糸状菌を多く含まれるようにして、それにより放線
菌を出しにくくし、糸状菌を活性にする。前者の拮抗微
生物としては、有限会社アグリカルチャー開発研究所
製、商品名「緑源浄化剤」として市販されている。後者
の拮抗微生物としては、有限会社アグリカルチャー開発
研究所製、商品名「緑源消臭剤」として市販されてい
る。この拮抗微生物を軽石又は人工濾材上に被覆して使
用する。なお、この被覆法は．拮抗微生物の溶液に軽石
又は人工濾材を浸漬して行なう。The antagonistic microorganisms used in the present invention mainly include photosynthetic bacteria, actinomycetes, filamentous fungi and basidiomycetes. The composition ratio of the microorganisms is different from the case where it is desired to make them. When it is desired to suppress the action of filamentous fungi, a large amount of photosynthetic bacteria is contained, actinomycetes that prey on the bacteria grow, and actinomycetes predominate on the surface of the filter medium, thereby suppressing the action of filamentous fungi. When it is desired to increase the activity of the filamentous fungi, the number of photosynthetic bacteria is reduced and the number of filamentous fungi is increased so that actinomycetes are hardly produced and the filamentous fungi are activated. The former antagonistic microorganism is commercially available from Agriculture Development Laboratory Co., Ltd. under the trade name “Green Source Purifier”. The latter antagonistic microorganism is commercially available from Agriculture Development Laboratory Co., Ltd. under the trade name "Green Source Deodorant". This antagonistic microorganism is used by being coated on a pumice stone or an artificial filter medium. In addition, this coating method is. This is performed by immersing pumice or an artificial filter medium in a solution of an antagonistic microorganism.
【０００８】次に本発明の方法を軽石濾過装置に適用し
た場合の実施例を示す。しかし、軽石に代えて人工濾材
を使用しても同様の操作で、同様の効果を奏することが
できる。Next, an embodiment in which the method of the present invention is applied to a pumice filter device will be described. However, the same effect can be obtained by the same operation even when an artificial filter medium is used in place of the pumice stone.
【実施例１】図１に示す本発明の実施例において、１は
地盤２の中に設置された濾過層を示し、この濾過層１の
側壁に湖沼又は河川の流水が流入される流入管３を取付
け、底部には濾過部４と洗浄水供給路５とが設けられて
いる。濾過部４には横向きの多孔部材６を取付け、この
多孔部材６によって前記湖沼表層水中の浮遊藻類を濾過
して除去する軽石７、この軽石の表面に拮抗微生物の
「緑源浄化剤」〔有限会社アグリカルチャー開発研究所
製商品名〕を被覆したものであり、粒径がほぼ２〜３m
m、層厚をほぼ25cmとする、を支持する。拮抗微生物を
粒子表面に被覆した軽石層は、全層厚25cmのうち表面の
10cmの層厚があれば十分である。多孔部材６の下部に処
理水受部８が設けられ、この処理水受部８には開閉弁９
が設けられている処理水配水管10が設けられている。濾
過部４の周囲には上部が開口した洗浄水排水部12を形成
し、洗浄水排水部12を開閉弁13が設けられている洗浄水
排水管14で濁水沈澱層15に連接している。11は濁水沈澱
層15の底部側壁に設けられた開閉弁付上澄水管、16は越
流管、17は沈澱汚泥を示す。Embodiment 1 In the embodiment of the present invention shown in FIG. 1, reference numeral 1 denotes a filtration layer provided in the ground 2, and an inflow pipe 3 into which a flowing water of a lake or a river flows into a side wall of the filtration layer 1. And a filter section 4 and a washing water supply path 5 are provided at the bottom. A horizontal porous member 6 is attached to the filtering section 4, and the porous member 6 filters and removes algae floating in the surface water of the lake or marsh, and a "green source purifying agent" of antagonistic microorganisms on the surface of the pumice [finite. Agriculture Development Laboratory Co., Ltd.]
m, and the layer thickness is approximately 25 cm. The pumice layer coated with antagonistic microorganisms on the particle surface is
A layer thickness of 10 cm is sufficient. A treated water receiving portion 8 is provided below the porous member 6, and the treated water receiving portion 8 has an on-off valve 9.
There is provided a treated water distribution pipe 10 provided with. A washing water drainage part 12 having an open top is formed around the filtration part 4, and the washing water drainage part 12 is connected to a turbid water sedimentary layer 15 by a washing water drainage pipe 14 provided with an on-off valve 13. Reference numeral 11 denotes a supernatant water pipe with an on-off valve provided on the bottom side wall of the turbid water sedimentation layer 15, reference numeral 16 denotes an overflow pipe, and reference numeral 17 denotes precipitated sludge.
【０００９】この装置を稼働して湖沼水又は河川水を濾
過するに際しては、洗浄水排水部12の開閉弁13を閉鎖し
て、流入口３から湖沼の表層水を濾過層１の濾過部４に
流入させて、オーバーフローする分は越流管16から湖沼
又は河川に返流し、残りはここに取付けられた多孔部材
６に支持された軽石層７によって前記湖沼表層水をほぼ
１ｍ/１時間の濾過速度をもって濾過して浮遊藻類を除
去する。このようにして処理されて処理水受部８へ通過
した処理水を、開閉弁９を開口して処理水排水管10を介
して湖沼又は河川に返流する。この場合濾過材の軽石は
多孔質であって表面積が大きいので、細菌等の微生物が
生息する生物膜の面積が大きくて付着機能が高くて、浮
遊藻類を効率良く除去すると共に、この軽石の表面に拮
抗微生物が被覆されているから、処理水の温度がほぼ25
℃以上の高温においては、拮抗微生物に含まれる光合成
細菌の増殖でこれを捕食する放線菌が優占となり、これ
により糸状菌を駆逐し糸状菌による浮遊藻類の分解を遅
延させる。それにより無機態の栄養塩の溶出を抑制する
ことができる。When this apparatus is operated to filter lake water or river water, the on-off valve 13 of the washing water drainage unit 12 is closed, and the surface water of the lake is filtered from the inflow port 3 to the filtration unit 4 of the filtration layer 1. And the overflow is returned from the overflow pipe 16 to a lake or a river, and the rest is pumice layer 7 supported by the porous member 6 attached thereto, and the surface water of the lake or marsh is moved for approximately 1 m / hour. To remove floating algae. The treated water that has been treated in this way and passed to the treated water receiving section 8 is returned to the lake or river via the treated water drain pipe 10 by opening the on-off valve 9. In this case, the pumice as a filtering material is porous and has a large surface area, so that the area of the biofilm in which microorganisms such as bacteria inhabit is large and the adhesion function is high, and the floating algae are efficiently removed, and the surface of the pumice is removed. The temperature of the treated water is about 25
At a high temperature of not less than ° C., actinomycetes that prey on the growth of photosynthetic bacteria contained in the antagonistic microorganisms predominate, thereby destroying filamentous fungi and delaying the decomposition of floating algae by the filamentous fungi. Thereby, elution of inorganic nutrients can be suppressed.
【００１０】[0010]
【実施例２】実施例１の軽石表面に拮抗微生物として
「緑源浄化剤」を被覆する代わりに「緑源消臭剤」を用
い、ほぼ15℃以下の低温の処理水に実施例１と同様に処
理し、拮抗微生物に含まれる糸状菌の働きにより、糸状
菌の活性が高まり生物膜の菌体網が緻密となり、浮遊藻
類の捕捉効果が向上する。Example 2 Instead of coating the pumice surface of Example 1 with a "green source deodorant" as an antagonistic microorganism, a "green source deodorant" was used, and treated with low-temperature treated water of approximately 15 ° C. or less. By treating in the same manner, the activity of the filamentous fungus contained in the antagonistic microorganisms enhances the activity of the filamentous fungus, makes the microbial cell network of the biofilm dense, and improves the capturing effect of the suspended algae.
【００１１】以上のように本発明においては、濾過材で
ある軽石又は人工濾材に光合成細菌、放線菌、糸状菌等
の拮抗微生物が被覆されているから、処理水の温度が高
温、低温により拮抗微生物の組成微生物により軽石又は
人工濾材上に生成される生物膜の浮遊藻類の分解遅延、
生物膜の菌体網の緻密化を適宜制御することができる。
その処理目的によって、本発明に使用する拮抗微生物の
組成は、糸状菌の働きを抑制するものと、糸状菌の働き
を活発にさせるものとで異なる。As described above, in the present invention, pumice or an artificial filter medium as a filter medium is coated with antagonistic microorganisms such as photosynthetic bacteria, actinomycetes, and filamentous fungi. Decomposition delay of suspended algae of biofilm produced on pumice or artificial filter media by microorganisms,
Densification of the cell network of the biofilm can be appropriately controlled.
Depending on the purpose of the treatment, the composition of the antagonistic microorganism used in the present invention differs between those that inhibit the action of filamentous fungi and those that activate the action of filamentous fungi.
【００１２】[0012]
【発明の効果】上記の通り、本発明は浮遊藻類を含む水
を軽石又は人工濾材濾過装置で濾過する際に生ずる軽石
又は人工濾材表面の生物膜が捕捉した浮遊藻類に対し、
高温時には軽石又は人工濾材に被覆した拮抗微生物の組
成中に存在する光合成細菌、放線菌等の働きにより、浮
遊藻類の分解を遅延して無機態の栄養塩の溶出を抑制さ
せ、低温時には、軽石又は人工濾材表面に被覆した拮抗
微生物の組成中にある糸状菌、担子菌等の働きにより生
物膜の菌体網を緻密にして生物膜による浮遊藻類の除去
効果を促進させる環境保全施設において極めて顕著な効
果を奏する発明である。As described above, the present invention provides a method for removing floating algae, which is generated when a water containing floating algae is filtered by a pumice or an artificial filter medium filtration device and is captured by a biofilm on the surface of the pumice or the artificial filter medium.
At high temperatures, the action of photosynthetic bacteria and actinomycetes in the composition of pumice or antagonistic microorganisms coated on the artificial filter media delays the decomposition of suspended algae and suppresses the elution of inorganic nutrients. Or extremely remarkable in environmental conservation facilities where the function of filamentous fungi, basidiomycetes, etc. in the composition of antagonistic microorganisms coated on the surface of the artificial filter media makes the microbial cell network of the biofilm dense and promotes the removal effect of suspended algae by the biofilm. It is an invention which has a special effect.
【図１】本発明の実施例の軽石濾過装置の縦断正面図で
ある。FIG. 1 is a vertical sectional front view of a pumice filter device according to an embodiment of the present invention.
１ 濾過層 ２ 地盤 ３ 流入管 ４ 濾過部 ５ 洗浄水供給路 ６ 多孔部材 ７ 軽石層 ８ 処理水受部 ９ 開閉弁 10 処理水排水管 11 上澄水管 12 洗浄水排水部 13 開閉弁 14 洗浄水排水管 15 濁水沈澱層 16 越流管 17 沈澱汚泥 DESCRIPTION OF SYMBOLS 1 Filtration layer 2 Ground 3 Inflow pipe 4 Filtration part 5 Cleaning water supply path 6 Porous member 7 Pumice layer 8 Treated water receiving part 9 Opening / closing valve 10 Treated water drain pipe 11 Clear water pipe 12 Wash water drain section 13 Open / close valve 14 Wash water Drainage pipe 15 Turbid water sedimentation layer 16 Overflow pipe 17 Settled sludge
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) C02F 3/06 C02F 3/10 C02F 3/34 B01D 24/02──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) C02F 3/06 C02F 3/10 C02F 3/34 B01D 24/02
Claims (2)
工濾材濾過装置において、軽石又は人工濾材の表面に拮
抗微生物を付着して、軽石又は人工濾材の表面に生成さ
れる生物膜に捕捉された浮遊藻類の分解を遅延すること
を特徴とする濾過装置における濾過生物膜の微生物制御
方法。1. A pumice or artificial filter medium filtration device for filtering water containing suspended algae, wherein an antagonistic microorganism adheres to the surface of the pumice or artificial filter medium and is captured by a biofilm formed on the surface of the pumice or artificial filter medium. A method for controlling microorganisms in a filtration biofilm in a filtration device, wherein the decomposition of suspended algae is delayed.
工濾材濾過装置において、軽石又は人工濾材の表面に拮
抗微生物を付着して、軽石又は人工濾材の表面に生成さ
れる生物膜の菌体網を緻密にして浮遊藻類の除去効果を
促進することを特徴とする濾過装置における濾過生物膜
の微生物制御方法。2. A pumice or artificial filter medium filtration device for filtering water containing suspended algae, wherein a biofilm is formed on the surface of the pumice or artificial filter medium by attaching antagonistic microorganisms to the surface of the pumice or artificial filter medium. A method for controlling microorganisms in a filtration biofilm in a filtration device, comprising reducing the density of a net to promote the effect of removing suspended algae.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7166116A JP2818856B2 (en) | 1995-06-30 | 1995-06-30 | Microbial control method for filtration biofilm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7166116A JP2818856B2 (en) | 1995-06-30 | 1995-06-30 | Microbial control method for filtration biofilm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0910785A JPH0910785A (en) | 1997-01-14 |
| JP2818856B2 true JP2818856B2 (en) | 1998-10-30 |
Family
ID=15825330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7166116A Expired - Lifetime JP2818856B2 (en) | 1995-06-30 | 1995-06-30 | Microbial control method for filtration biofilm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2818856B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106148193A (en) * | 2015-04-14 | 2016-11-23 | 北京林业大学 | Frustule sampling and the method cultivated in a kind of surrounding air |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05138186A (en) * | 1991-11-13 | 1993-06-01 | B Bai B:Kk | Treatment of drainage discharged from purification tank |
-
1995
- 1995-06-30 JP JP7166116A patent/JP2818856B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0910785A (en) | 1997-01-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100977996B1 (en) | Constructed wetland for sewage treatment | |
| US5976374A (en) | Self-cleansing filter | |
| JP2818856B2 (en) | Microbial control method for filtration biofilm | |
| JP2002126777A (en) | Filter tank and water treatment method | |
| KR100409108B1 (en) | Artifical Pond | |
| JPS588587A (en) | Closed activated-sludge system for treating organic waste water | |
| JPH01189310A (en) | Purification of water of scenic pond or the like | |
| JP3519031B2 (en) | Purification equipment for treated effluent | |
| SU969683A1 (en) | Apparatus for purifying water | |
| JPH10249371A (en) | Septic tank and its cleaning method | |
| JP3454391B2 (en) | Granule blocks for water treatment | |
| JPH11128614A (en) | Solid-liquid separation and device therefor | |
| JPH0647526Y2 (en) | Downflow clarification device | |
| JP2000000599A (en) | Method and apparatus for improving water quality of water source | |
| JP2580529B2 (en) | Pumice filter | |
| JPS60193597A (en) | Treatment of sewage and filtration structure used for sewage treatment | |
| JPS6362515A (en) | Treatment of muddy water | |
| JPH04193398A (en) | Treatment of sewage | |
| JPH047093A (en) | Purifying apparatus | |
| Schwankl et al. | Filtration equipment for drip irrigation | |
| JPH06182396A (en) | Biological treatment of waste water by membrane separation and equipment therefor | |
| JPH06226280A (en) | Sewage purifying method | |
| JPH0596297A (en) | Purifying treatment of sewage | |
| JPH01228596A (en) | Method for washing biological filter apparatus | |
| JPH0669553B2 (en) | Sewage purification method and equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |