JPH0747381A - Upward stream type filter device - Google Patents
Upward stream type filter deviceInfo
- Publication number
- JPH0747381A JPH0747381A JP5211070A JP21107093A JPH0747381A JP H0747381 A JPH0747381 A JP H0747381A JP 5211070 A JP5211070 A JP 5211070A JP 21107093 A JP21107093 A JP 21107093A JP H0747381 A JPH0747381 A JP H0747381A
- Authority
- JP
- Japan
- Prior art keywords
- water
- tank
- pipe
- filter
- filter layer
- 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
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
- Biological Treatment Of Waste Water (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、濾過槽内に浮上性の
濾材による濾層を設け、原水を上記濾層に上向流で通水
する上向流式濾過装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upward flow type filtration device in which a filter layer made of a floatable filter medium is provided in a filtration tank and raw water is passed through the filter layer in an upward flow.
【０００２】[0002]
【従来の技術】ポリプロピレンや、ウレタン樹脂等を直
径３〜１０ｍｍの球状や、不定形状に発泡成形した比重
が極めて小さい浮上性の濾材で濾過槽内に濾層を構成
し、この濾層に上向流で原水を通水して、濾過、生物濾
過を行う濾過装置が開発されている。上記濾過装置で
は、濾過槽内の水中の上部に通水性の上面支持板を配置
し、この支持板の下に浮上性濾材を存在させて濾層を構
成し、濾材は上面支持板から上には行けないようにし、
濾過槽内の底部に原水を供給し、原水を濾層中に上向流
で通水して原水を濾過し、処理水とする。2. Description of the Related Art A filter layer is formed in a filter tank by a floatable filter material having a very small specific gravity formed by foaming polypropylene or urethane resin into a spherical or irregular shape having a diameter of 3 to 10 mm. A filtration device has been developed which performs countercurrent flow of raw water to perform filtration and biological filtration. In the above filtering device, a water-permeable upper surface support plate is arranged in the upper part of the water in the filtration tank, and a buoyant filter medium is present under the support plate to form a filter layer. So I ca n’t go,
Raw water is supplied to the bottom of the filtration tank, and the raw water is passed through the filter bed in an upward flow to filter the raw water to obtain treated water.
【０００３】この浮上性濾材は、発泡成形されているの
で小粒径でありながら表面積が広いため生物濾過の場
合、濾材に付着する生物膜の保持量は極めて大であり、
その結果、高負荷運転が可能となり、高度の処理水を得
ることができる。又、濾材は比重が０．１以下で、浮上
性を有するため、下向流の洗浄水で濾材を洗浄する際
に、多量の空気で濾材を流動させる必要が無いので洗浄
用空気が大幅に低減する。Since this floatable filter medium is formed by foaming and has a small particle size but a large surface area, the retention amount of the biofilm adhering to the filter medium is extremely large in the case of biological filtration.
As a result, high-load operation becomes possible and a high level of treated water can be obtained. Further, since the filter medium has a specific gravity of 0.1 or less and has a floating property, it is not necessary to flow the filter medium with a large amount of air when washing the filter medium with downflow washing water, so that the cleaning air is significantly Reduce.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら濾材は前
述したように比重が小さいので、濾層を下向流の洗浄水
で流動、展開させるには４０ｍ／時以上の早い下向き流
速を必要とし、そのために大容量のポンプを使用しなけ
ればならず、又、洗浄水の使用量も非常に多くなる。However, since the filter medium has a small specific gravity as described above, a high downward flow velocity of 40 m / hour or more is required for flowing and developing the filter layer with the downward flow washing water. Therefore, a large-capacity pump must be used, and the amount of washing water used becomes very large.
【０００５】[0005]
【課題を解決するための手段】そこで本発明は、上記問
題点を解消するために開発されたもので、濾過槽内に浮
上性の濾材による濾層を設け、原水を上記濾層に上向流
で通水する上向流式濾過装置において、上記濾層の内部
上方に下向きに水を噴出する水噴出管を設け、槽内底部
の槽内液を循環ポンプで汲出す循環管を上記水噴出管に
接続すると共に、槽内の水を抜くドレン管と、槽内に上
から水を補給する水張り管を設けたことを特徴とする。Therefore, the present invention was developed in order to solve the above-mentioned problems. A filter layer made of a floatable filter material is provided in a filtration tank, and raw water is directed to the filter layer. In an upward flow type filtration device that flows water by a flow, a water jet pipe that jets water downward is provided above the inside of the filter layer, and a circulation pipe that pumps out the in-tank liquid at the bottom of the tank with a circulation pump is used as the water pipe. It is characterized in that it is connected to the ejection pipe, and a drain pipe for draining water in the tank and a water filling pipe for supplying water from above are provided in the tank.
【０００６】[0006]
【実施例】図示の各実施例において、１０は濾過槽、１
１は浮上性の濾材で構成した濾層、１２は濾過槽内の水
中の上部に設けた上記濾層の上面を規定する通水性の上
面支持板、１３は濾過槽内の底に原水を供給する原水供
給管、１４は濾過槽内の上部から処理水を取出す取出
管、１５は濾層の内部上方に設けた下向きに水を噴出す
る水噴出管、１６は濾過槽内底部の槽内液を循環ポンプ
Ｐで汲出し、前記水噴出管１５に供給する循環管、１７
は槽内の水を抜くドレン管、１８は槽内に上から水を補
給する水張り管を示す。EXAMPLE In each of the illustrated examples, 10 is a filter tank, and 1 is
1 is a filter layer composed of a buoyant filter medium, 12 is a water-permeable upper surface support plate that defines the upper surface of the filter layer provided above the water in the filtration tank, and 13 supplies raw water to the bottom of the filtration tank. Raw water supply pipe, 14 is a take-out pipe for taking out treated water from the upper part in the filtration tank, 15 is a water ejection pipe for ejecting downward water provided above the inside of the filter layer, and 16 is a tank liquid at the bottom of the filtration tank. , A circulation pipe for supplying water to the water jet pipe 15
Is a drain pipe for draining water from the tank, and 18 is a water-filled pipe for replenishing water into the tank from above.
【０００７】図１の実施例は実験的設備として、濾過槽
１０には直径４００ｍｍ、高さ３０００ｍｍの透明カラ
ムを使用し、カラム内の上部に網目の大きさが２ｍｍ以
下の網を設置して上面支持板１２とし、その下に層高１
５００ｍｍの濾層１１を設けた。濾層を構成する浮上性
の濾材は、粒径３ｍｍの発泡スチロール製の細粒で、比
重は乾燥状態で０．０３ｋｇ／立である。又、水噴出管
１５は、濾層１１の内部の、上面支持板の直下に設け
る。In the embodiment shown in FIG. 1, a transparent column having a diameter of 400 mm and a height of 3000 mm is used as the filter tank 10, and a mesh having a mesh size of 2 mm or less is installed in the upper part of the column. The upper support plate 12 and the layer height 1 below it
A 500 mm filter layer 11 was provided. The buoyant filter medium constituting the filter layer is fine polystyrene particles having a particle diameter of 3 mm and has a specific gravity of 0.03 kg / standing in a dry state. Further, the water jet pipe 15 is provided inside the filter layer 11 just below the upper surface support plate.
【０００８】運転を行うには、処理水の取出管１４のレ
ベルまで、水張り管１８によって濾過槽内に水を張り、
それから原水供給管１３で原水を槽内底部に供給し、濾
層１１中を上向流させる。場合によっては、槽内底部に
散気管を配置して空気を供給し、空気と一緒に原水を上
向流させてもよい。これにより原水中に含まれているＳ
Ｓは濾層に捕捉され、原水は処理水となって取出管１５
から溢流する。こうして運転を継続すると、濾層は原水
中から捕捉したＳＳによって圧力損失が高くなる。圧力
損失が所定の程度、高まったら濾層を構成する濾材を流
動、展開させ、濾材に付着するＳＳを剥離するための洗
浄を行う。To perform the operation, water is filled in the filtration tank by the water filling pipe 18 to the level of the treated water extraction pipe 14,
Then, raw water is supplied to the inner bottom of the tank by the raw water supply pipe 13 to cause an upward flow in the filter layer 11. In some cases, an air diffuser may be arranged at the bottom of the tank to supply air, and the raw water may be allowed to flow upward together with the air. As a result, S contained in raw water
S is trapped in the filter layer, and the raw water becomes treated water and the extraction pipe 15
Overflow from. When the operation is continued in this way, the filter bed has a high pressure loss due to the SS captured from the raw water. When the pressure loss increases to a predetermined degree, the filter material constituting the filter layer is caused to flow and spread, and washing is performed to remove the SS adhering to the filter material.
【０００９】洗浄を行うには、原水の供給を停止し、ド
レン管１７の開閉弁を開いて、槽内液を上面支持板１２
の下部、約１０ｃｍの位置まで排水した後、ドレン管１
７の開閉弁を閉じ、循環管１６のポンプＰを運転し、槽
内液を循環管から濾層内上部の水噴出管１５に供給し、
濾層中に下向きに噴出させる。次に０．５分から１０分
間の間、濾材の流動・展開を行った後、ドレン管１７の
開閉弁を開け、濾材が流出しない程度の濾過槽底部から
５０ｃｍから７０ｃｍの高さの位置まで濾材から剥離し
たＳＳを含む逆洗排液を排出し、ドレン管１７の開閉弁
を閉じる。次に水張り管１８の開閉弁を開け、洗浄水と
して工水や濾過槽の処理水を濾過槽内に注入し、濾過槽
の上面支持板１２の下部、約１０ｃｍの位置まで水張り
を行い、０．５分から１０分間の間、濾材の流動・展開
を行う。尚、ドレンの排出と洗浄水の水張り期間も、循
環管１６のポンプＰの運転は連続して行い、濾材の流動
・展開は継続する。次に、循環管１６のポンプＰの運転
を停止し、ドレン管１７の開閉弁を開け、濾過槽底部か
ら５０ｃｍから７０ｃｍの高さの位置まで濾材から剥離
したＳＳを含む逆洗排液を排出し、ドレン管１７の開閉
弁を閉じる。逆洗排液を排出した後、水張り管１８より
洗浄水を濾過槽の処理水の取出管１４のレベルまで注入
し濾過運転を再開する。尚、逆洗が不十分な場合は、こ
れら一連の工程を数回繰り返す。下記に主工程を示す。 （１）槽内液の一部排出 ：ドレン管１７を開け、上面
支持板１２の下部まで排出 （２）槽内液の噴出 ：循環管１６、ポンプＰの運
転、 （３）逆洗排液の排出 ：槽内液を噴出しながらドレ
ン管１７を開け、槽底部から５０ｃｍから７０ｃｍの位
置まで排出 （４）洗浄水の水張り ：槽内液を噴出しながら、水
張り管１８より水張り （５）槽内液の噴出 ：（２）工程と同等 （６）逆洗排液の排出 ：槽内液の噴出を停止し、ド
レン管１７より槽底部から５０ｃｍから７０ｃｍの位置
まで逆洗排液を排出 （７）洗浄水の水張り 尚、逆洗が不十分な場合は、上記工程の繰り返し （８）濾過運転再開In order to perform the cleaning, the supply of raw water is stopped, the opening / closing valve of the drain pipe 17 is opened, and the liquid in the tank is removed from the upper support plate 12
Drain pipe 1 after draining to the position of about 10 cm at the bottom of the
7, the on-off valve of 7 is closed, the pump P of the circulation pipe 16 is operated, and the liquid in the tank is supplied from the circulation pipe to the water ejection pipe 15 in the upper part of the filter bed,
Eject downward into the filter bed. Then, after flowing and developing the filter medium for 0.5 to 10 minutes, the opening / closing valve of the drain pipe 17 is opened to a position 50 to 70 cm from the bottom of the filter tank where the filter medium does not flow out. The backwash drainage containing SS peeled off is discharged, and the opening / closing valve of the drain pipe 17 is closed. Next, the on-off valve of the water filling pipe 18 is opened, industrial water or treated water in the filtration tank is injected into the filtration tank as cleaning water, and water is filled up to a position of about 10 cm below the upper support plate 12 of the filtration tank. Flow and develop the filter medium for 5 to 10 minutes. The pump P of the circulation pipe 16 is continuously operated during the drainage period and the flush water filling period, and the flow and development of the filter medium are continued. Next, the operation of the pump P of the circulation pipe 16 is stopped, the opening / closing valve of the drain pipe 17 is opened, and the backwash drainage containing SS separated from the filter medium is discharged from the bottom of the filtration tank to a position 50 cm to 70 cm high. Then, the open / close valve of the drain pipe 17 is closed. After the backwash drainage is discharged, the wash water is injected from the water filling pipe 18 to the level of the treated water extraction pipe 14 of the filtration tank, and the filtration operation is restarted. If backwashing is insufficient, these series of steps are repeated several times. The main steps are shown below. (1) Partial discharge of liquid in the tank: Open the drain pipe 17 and discharge to the lower part of the upper support plate 12 (2) Jet of liquid in the tank: Operation of the circulation pipe 16 and pump P, (3) Backwash drain Discharge: While discharging the liquid in the tank, open the drain pipe 17 and discharge from the bottom of the tank to a position of 50 cm to 70 cm. (4) Filling with cleaning water: Spraying the liquid in the tank and filling it with water from the water filling pipe (5) Ejection of in-tank liquid: Equivalent to (2) step (6) Discharge of backwash drainage: Stop ejection of in-tank liquid and drain backwash drainage from drain bottom 17 to a position 50 cm to 70 cm from the bottom of the tank (7) Water filling with wash water If backwashing is insufficient, repeat the above steps (8) Restart filtration operation
【００１０】槽内液をドレン管１７で排水しながら水噴
出管から下向きに槽内液を噴出したり、水張り管で水を
補給しながら水噴出管から下向きに槽内液を噴出する
と、噴出した水は直接、濾材に当たり、濾材の表面を洗
浄すると同時に、噴出する槽内液の圧力で濾材同志が衝
突、混合し、濾材に付着したＳＳは濾材の表面から効果
的に剥離する。このときの水位の低下、及び上昇速度が
低いほど噴出水により濾材が衝突する時間が長くなるた
め効果は高まる。このようにして水噴出管から噴出する
水の流速は濾過槽の断面積に対し５〜１０ｍ／時で充分
に洗浄効果が得られる。勿論、流速は早い程、洗浄効果
があるので、その場合は洗浄工程の繰返し回数を減少で
きる。又、水噴出管から噴出する水は、槽内液を循環し
て使用するため、洗浄のための使用水量も大幅に減少す
る。When the in-tank liquid is ejected downward from the water ejection pipe while draining the in-tank liquid through the drain pipe 17, or when the in-tank liquid is ejected downward from the water ejection pipe while replenishing water with the water filling pipe, it is ejected. The water directly hits the filter medium to wash the surface of the filter medium, and at the same time, the filter mediums collide and mix with each other due to the pressure of the ejected liquid in the tank, and the SS attached to the filter medium is effectively separated from the surface of the filter medium. At this time, the lower the water level and the lower the rising speed, the longer the time that the filter medium collides with the jetted water, so the effect is enhanced. In this way, the flow velocity of the water jetted from the water jet pipe is 5 to 10 m / hour with respect to the cross-sectional area of the filtration tank, and a sufficient cleaning effect can be obtained. Of course, the faster the flow rate is, the better the cleaning effect is, and in that case, the number of times of repeating the cleaning process can be reduced. Further, since the water ejected from the water ejection pipe circulates the liquid in the tank and is used, the amount of water used for cleaning is greatly reduced.
【００１１】図２の実施例は、濾過槽内の濾層充填部を
縦の隔壁１９で仕切り、仕切られた各区劃内に複数（図
では２つ）の濾層１１Ａと１１Ｂを設けてある。勿論、
各濾層とも浮上性の濾材で構成する。各濾層１１Ａ，１
１Ｂの内部には、上面支持板１２の直下に下向きに水を
噴出する水噴出管１５Ａ，１５Ｂが設けてある。そし
て、ポンプＰで槽内底部の液を抜き出す循環管１６Ａ，
１６Ｂが上記水噴出管１５Ａ，１５Ｂに接続してある。In the embodiment shown in FIG. 2, the filter layer filling portion in the filter tank is partitioned by vertical partition walls 19, and a plurality (two in the figure) of filter layers 11A and 11B are provided in each partitioned partition. . Of course,
Each filter layer is composed of a floatable filter material. Each filter layer 11A, 1
Inside the 1B, water jet pipes 15A and 15B for jetting water downward are provided just below the upper surface support plate 12. The circulation pipe 16A for extracting the liquid at the bottom of the tank with the pump P,
16B is connected to the water ejection pipes 15A and 15B.
【００１２】供給管１３で槽内に供給された原水は、濾
層１１Ａ，１１Ｂを上向流し、その際に含んでいるＳＳ
を濾層に捕捉されて処理水となり、取出管１４から溢流
する。The raw water supplied into the tank through the supply pipe 13 flows upward through the filter layers 11A and 11B and is contained in the SS.
Is captured by the filter layer and becomes treated water, which overflows from the take-out pipe 14.
【００１３】洗浄の際は、原水の供給を止め、濾層１１
Ａと、濾層１１Ｂを個々に洗浄して、濾材に付着するＳ
Ｓを剥離し、除外する。例えばドレン管１７から槽内液
を上部支持板の下部まで排出した後、循環ポンプを運転
し、循環管１６Ａの、開閉弁Ｖ1 を開いて水噴出管１５
Ａから槽内液を噴出し、濾層１１Ａの濾材を洗浄する。
次いで、循環管１６Ｂの開閉弁Ｖ2 を開き、濾層１１Ｂ
の濾材を洗浄する。この工程を数回繰返した後、ドレン
管１７を開き、濾材から剥離したＳＳを含む逆洗排液を
排出しながら、循環管１６Ａ，１６Ｂの開閉弁Ｖ1 ，Ｖ
2 を交互に、又は同時に開き、濾材の表面からのＳＳの
剥離効果を高める。次に、水張り管１８から洗浄水を注
入しながら、槽内液を濾層１１Ａ，１Ｂに、交互に又は
同時に噴出させる。洗浄が終ったら運転を再開する。
尚、逆洗時に濾材がドレン管から流出するのを防止する
ため、濾層の下面にも通水性の支持板を設けるか、ドレ
ン管１７に濾層下面までの立ち上げ部を設ける。During washing, the supply of raw water is stopped and the filter layer 11
A and the filter layer 11B are washed individually and attached to the filter medium S
Peel off S and remove. For example, after draining the liquid in the tank from the drain pipe 17 to the lower part of the upper support plate, the circulation pump is operated, and the opening / closing valve V 1 of the circulation pipe 16A is opened to open the water ejection pipe 15
The tank liquid is jetted from A to wash the filter material of the filter layer 11A.
Then, the on-off valve V 2 of the circulation pipe 16B is opened, and the filter bed 11B is opened.
Wash the filter medium of. After repeating this process several times, the drain pipe 17 is opened to discharge the backwash drainage containing SS separated from the filter medium, while opening / closing valves V 1 , V of the circulation pipes 16A, 16B.
2 is opened alternately or simultaneously to enhance the effect of separating SS from the surface of the filter medium. Next, while injecting washing water from the water filling pipe 18, the liquid in the tank is jetted alternately or simultaneously to the filter layers 11A and 1B. When cleaning is completed, restart operation.
In order to prevent the filter medium from flowing out of the drain pipe during backwashing, a water-permeable support plate is also provided on the lower surface of the filter layer, or the drain pipe 17 is provided with a rising portion up to the lower surface of the filter layer.
【００１４】このように隔壁により仕切った複数の濾層
を個々に洗浄することにより、濾過装置が大型であって
も、小型の循環ポンプを使用して５〜１０ｍ／時の通水
線速度で水噴出管１５Ａ，１５Ｂから水を噴出させるこ
とができ、洗浄が行える。By individually washing the plurality of filter layers partitioned by the partition walls as described above, even if the filtration device is large, a small circulation pump is used to achieve a water linear velocity of 5 to 10 m / hour. Water can be jetted from the water jet pipes 15A and 15B, and cleaning can be performed.
【００１５】図示の実施例は通常の濾過装置であるが、
本発明は濾層を構成する浮上性濾材に生物膜を付着、生
育させる生物濾過装置にも適用できる。その場合は各濾
層の下に酸素を供給するための散気管を配管するだけで
よい。Although the illustrated embodiment is a conventional filtration device,
The present invention can also be applied to a biological filtration device that attaches and grows a biological film on a floating filter material that constitutes a filter layer. In that case, it suffices to pipe an air diffuser for supplying oxygen under each filter layer.
【００１６】[0016]
【発明の効果】以上で明らかなように、本発明によれば
４０ｍ／時以上の高流速を必要とせず濾層を構成する濾
材の全量を完全に洗浄することができる。従って、循環
ポンプは小容量のものでよく、運転コストも嵩まない。
更に、槽内液を循環使用して洗浄するため、洗浄のため
に使用する水量も少なくて済む。As is apparent from the above, according to the present invention, it is possible to completely wash the entire amount of the filter medium constituting the filter layer without requiring a high flow rate of 40 m / hour or more. Therefore, the circulation pump may have a small capacity and the operating cost does not increase.
Further, since the liquid in the tank is circulated for cleaning, the amount of water used for cleaning can be small.
【図１】本発明の第１実施例の断面図である。FIG. 1 is a sectional view of a first embodiment of the present invention.
【図２】本発明の第２実施例の断面図である。FIG. 2 is a sectional view of a second embodiment of the present invention.
１０ 濾過槽 １１ 濾層 １１Ａ 濾層 １１Ｂ 濾層 １２ 上面支持板 １３ 原水供給管 １４ 処理水取出管 １５ 水噴出管 １５Ａ 水噴出管 １５Ｂ 水噴出管 １６ 循環管 １７ ドレン管 １８ 水張り管 10 Filtration tank 11 Filtration layer 11A Filtration layer 11B Filtration layer 12 Top support plate 13 Raw water supply pipe 14 Treated water extraction pipe 15 Water ejection pipe 15A Water ejection pipe 15B Water ejection pipe 16 Circulation pipe 17 Drain pipe 18 Water filling pipe
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 8925−4Ｄ Ｂ０１Ｄ 29/08 ５４０ Ａ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location 8925-4D B01D 29/08 540 A
Claims (1)
け、原水を上記濾層に上向流で通水する上向流式濾過装
置において、上記濾層の内部上方に下向きに水を噴出す
る水噴出管を設け、槽内底部の槽内液を循環ポンプで汲
出す循環管を上記水噴出管に接続すると共に、槽内の水
を抜くドレン管と、槽内に上から水を補給する水張り管
を設けたことを特徴とする上向流式濾過装置。1. In an upflow-type filtration device in which a filter layer made of a floatable filter medium is provided in a filtration tank, and raw water is passed through the filter layer in an upward flow. A water spouting pipe that spouts water is provided, and a circulation pipe that pumps out the in-tank liquid at the bottom of the tank with a circulation pump is connected to the water spouting pipe, and a drain pipe for draining water from the tank and water from above in the tank. An upflow-type filtration device, which is provided with a water-filled pipe for replenishing water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5211070A JPH0747381A (en) | 1993-08-04 | 1993-08-04 | Upward stream type filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5211070A JPH0747381A (en) | 1993-08-04 | 1993-08-04 | Upward stream type filter device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0747381A true JPH0747381A (en) | 1995-02-21 |
Family
ID=16599913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5211070A Pending JPH0747381A (en) | 1993-08-04 | 1993-08-04 | Upward stream type filter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0747381A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10337585A (en) * | 1997-06-05 | 1998-12-22 | Nippon Steel Corp | Method for back wash of surfacing filter medium |
| KR100646309B1 (en) * | 2005-07-11 | 2006-11-23 | 유네코개발 주식회사 | Apparatus for filtering sludge from water for purification |
| JP2016185517A (en) * | 2015-03-27 | 2016-10-27 | 栗田工業株式会社 | Filter for cooling water and filtration treatment method of cooling water |
| CN115650324A (en) * | 2022-09-21 | 2023-01-31 | 徐州市渔淼水产有限公司 | Water purification device for cultivation |
-
1993
- 1993-08-04 JP JP5211070A patent/JPH0747381A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10337585A (en) * | 1997-06-05 | 1998-12-22 | Nippon Steel Corp | Method for back wash of surfacing filter medium |
| KR100646309B1 (en) * | 2005-07-11 | 2006-11-23 | 유네코개발 주식회사 | Apparatus for filtering sludge from water for purification |
| JP2016185517A (en) * | 2015-03-27 | 2016-10-27 | 栗田工業株式会社 | Filter for cooling water and filtration treatment method of cooling water |
| CN115650324A (en) * | 2022-09-21 | 2023-01-31 | 徐州市渔淼水产有限公司 | Water purification device for cultivation |
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