JPS59166218A - Method and device for filtering and thickening - Google Patents
Method and device for filtering and thickeningInfo
- Publication number
- JPS59166218A JPS59166218A JP58040945A JP4094583A JPS59166218A JP S59166218 A JPS59166218 A JP S59166218A JP 58040945 A JP58040945 A JP 58040945A JP 4094583 A JP4094583 A JP 4094583A JP S59166218 A JPS59166218 A JP S59166218A
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- JP
- Japan
- Prior art keywords
- water
- filter
- filtration
- hearth
- chamber
- 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.)
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- Filtration Of Liquid (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は多数の可撓性繊維を全面に垂下はせてなる通液
性炉床と、浮力を有する球(塊)、筒状KAF状、格子
状物体とを組み合わせた新規な炉床を用い、かつ該炉床
の洗滌効果を高めるための空気導入口を設けたことを特
徴とする濾過装置、およびこれを用いて水中の懸濁物を
濾過捕捉し、濃縮する方法に関し、先願昭5’7−21
9516の改良に関するものである。Detailed Description of the Invention The present invention combines a liquid-permeable hearth made of a large number of flexible fibers suspended over the entire surface, and a buoyant ball (lump), cylindrical KAF shape, and grid-like object. A filtration device characterized by using a new hearth and having an air inlet to enhance the cleaning effect of the hearth, and using the same to filter and trap suspended matter in water and concentrate it. Regarding the method, the earlier application
This is an improvement of 9516.
すてに可撓性繊維炉床を用いるが過装置としては、回転
体形式で長毛炉布をドラム外周に張った型式のものが公
知で、この従来のものは、回転するドラム外周に沿う水
流の力で枦毛がなびき、これが張りついた状態で炉床を
形成し、ドラムの外部から内部に水が通過する際、表層
においてケーキを得る方式であった。A well-known type of filtering device that uses a flexible fiber hearth is a rotating body type in which a long-haired hearth cloth is stretched around the outer periphery of the drum. The force of the drum caused the hairs to flutter and stick together to form a hearth, and when water passed from the outside to the inside of the drum, a cake was formed on the surface layer.
この方式は連続して濾過を行ない得る長所があるが、そ
の反面、廻転鎖体であるため機械的作動部分や摺動部分
があり、製作費および保守費がかさむうえ、炉毛の洗滌
が不充分であるなど短所も多い。This method has the advantage of being able to perform continuous filtration, but on the other hand, since it is a rotating chain, there are mechanically operating and sliding parts, which increases production and maintenance costs, and it is difficult to clean the furnace bristles. There are many disadvantages, such as being insufficient.
一方、−上向流にて使用する浮上が体としては、この方
式は浮上球(塊)体、そのものを炉床とするので、炉床
の目が粗く、濾過精度が悪い。濾過精度を改善するため
に球(塊)体の径を小さくする七浮力か小さくなり、ケ
ーキとの分離性が悪く、逆洗水とともに、この枦体球(
塊)が流出してしまり欠点があった。On the other hand, in this system, the floating body used in the upward flow is a floating sphere (clump), which itself serves as the hearth, so the hearth has coarse mesh and poor filtration accuracy. In order to improve the filtration accuracy, the diameter of the sphere (lump) body is reduced.7 The buoyancy is small, and the separation from the cake is poor, and together with the backwash water, this rod sphere (
There was a drawback that the lumps) leaked out.
そのために、浮上球(塊)体炉床の上部にゼオライト、
珪藻土、砂などの固、定層を設けたり、マット状の繊維
層などの補助炉床を設けて濾過精度を補う方法がとられ
て来た。For this purpose, zeolite is placed at the top of the floating sphere (clump) hearth.
Methods have been taken to supplement filtration accuracy by providing a fixed or fixed layer of diatomaceous earth or sand, or by providing an auxiliary hearth such as a mat-like fiber layer.
しかしこれ等の補助炉床は、単に下降流にて逆洗する際
、炉床を構成する粒子またはマット中の繊維の間隔が開
かず、充分な炉床の洗滌と再生が行なわれない欠点があ
った。このため補助炉床を取り出して高圧水洗を行なう
など重大な欠点があり、多くの利点にも拘らず、浮上炉
体を使用した」―向流が過方式は現在は余り使用されて
いない。However, these auxiliary hearths have the disadvantage that when simply backwashing with a downward flow, the particles or fibers in the mat that make up the hearth are not spaced, and the hearth is not sufficiently washed and regenerated. there were. For this reason, the auxiliary hearth had to be taken out and washed with high-pressure water, which had serious drawbacks, and despite its many advantages, a floating furnace was used.'' - The countercurrent flow system is not used much today.
本発明にかかる濾過装置は、濾過槽容器を、多数の可撓
性繊維を全面に垂下してなる通液性炉床で上、下室に仕
切り、その下室には原液により浮上して、上記可撓性繊
維束を圧密状に押し上げることができる浮力浮上体を装
填し、併せて原液供J430と空気出入口を付設してな
るものである。The filtration device according to the present invention partitions a filtration tank container into an upper chamber and a lower chamber with a liquid-permeable hearth formed by hanging a large number of flexible fibers over the entire surface, and in the lower chamber, the undiluted solution floats, It is equipped with a buoyant floating body capable of pushing up the flexible fiber bundle in a compact manner, and is also provided with a stock solution supply J430 and an air inlet/outlet.
さらに数行すると、先願にかかる可撓性繊維束炉床2と
、これを下側から浮力によって圧着する浮−ヒ体3との
組み合わせ炉体を使用する濾過装置において、本願では
さらに王室に直接空気を導入する機構を加えることによ
って、浮上体による繊 −維束炉床の圧密化(濾過時
)と、解緊垂下(逆洗時)動作を完全、確実ならしめ、
機械的作動部分の極めて少な(ハ、従って安価、保守が
容易、かつ濾過精度の良好な濾過装置を提供することが
できたのである。A few lines further, in the filtration device that uses a combination furnace body of the flexible fiber bundle hearth 2 and the floating body 3 that presses the flexible fiber bundle hearth 2 from below by buoyancy force, the present application further uses the royal By adding a mechanism that directly introduces air, the consolidation (during filtration) of the fiber bundle hearth by the floating body and the unclamping and drooping (during backwashing) operations are made complete and reliable.
It has been possible to provide a filtration device with extremely few mechanically operating parts (c), which is therefore inexpensive, easy to maintain, and has good filtration accuracy.
第1図によって、さらに具体的に説明する。This will be explained in more detail with reference to FIG.
濾過槽容器1内に、原水供給口5から原水を供給し、上
向流にて濾過するときは、可撓性繊維束炉床2は浮力を
有する球(塊)状浮上体3によって上方に圧着され、緊
密な繊維層炉床を形成し、主としてその下面にて懸濁物
が捕集される。When raw water is supplied into the filtration tank container 1 from the raw water supply port 5 and filtered in an upward flow, the flexible fiber bundle hearth 2 is moved upward by the buoyant ball (clump)-shaped floating body 3. It is crimped to form a tight fiber bed hearth, the lower surface of which primarily collects suspended matter.
ところが、炉床の逆洗、再生を考える場合、この状態の
まま単に流れの方向を下向流に変えたのみで逆洗をする
と、非常に強力な水流で浮上体を押し下げるか、下室S
2内に績拌機を設けない限り、浮上球(塊)体は力j床
を圧密しているので、−炉床を形成する繊維の洗滌効果
は低い。そのために多量の洗滌水を必要とし、濃縮効果
が減殺されることを見出し、種々これの改善を試みた結
果、空気導入口16を設けることによって最小限の水量
で、高い洗滌効果を発揮できることに成功したものであ
る。However, when considering backwashing and regeneration of the hearth, if backwashing is performed by simply changing the flow direction to a downward flow in this state, a very powerful water flow will push down the floating objects or the lower chamber S
Unless a stirrer is provided in the hearth, the floating spheres (clumps) consolidate the bed, and the cleaning effect of the fibers forming the hearth is low. We discovered that this required a large amount of washing water, which diminished the concentration effect, and as a result of various attempts to improve this, we found that by providing the air inlet 16, it was possible to achieve a high washing effect with a minimum amount of water. It was a success.
即ち沖過操作を終り、バルブ6を閉じ、逆洗、再生操作
に移る際に、濃縮水排出口のノくルブ7を開くと、内部
は負圧になるので、空気は炉床を通ることなく、空気出
入口lOおよび空気導入口16を通って、炉床下室S2
に直接流入することになる。That is, when the overflow operation is finished, the valve 6 is closed, and the knob 7 of the concentrated water outlet is opened when proceeding to the backwashing and regeneration operations, the internal pressure becomes negative, so that air can pass through the hearth. through the air inlet/outlet lO and the air inlet 16 to the lower hearth chamber S2.
will flow directly into.
従って一1工室s1に炉水を残した状態で、王室の水位
を下げ、結果的に浮上体の位置を下げることによって、
繊維束炉床を解禁、これを空気中に垂下状態にし、L室
S1に残るか週末の流下によって洗滌が行なわれるため
、炉床の洗滌効果が高まるものである。Therefore, by lowering the water level in the royal chamber and lowering the position of the floating body while leaving the reactor water in room 11 s1,
The hearth cleaning effect is enhanced because the fiber bundle hearth is opened and allowed to hang in the air, and the fiber bundles remain in the L room S1 or are washed down on weekends.
空気導入口]6は逆洗時、炉床を通ることなく、炉床下
室に直接空気を送入できる構造であれば、とくに経路は
問わないが、例えば第2図に示す構造17、第4図に示
す構造21のものが挙げられる。The air inlet 6 may be of any route as long as it has a structure that allows air to be fed directly into the chamber below the hearth without passing through the hearth during backwashing, but for example, the structure 17 shown in FIG. An example is structure 21 shown in the figure.
第2図に示すものは逆洗身工程で、バルブ6が閉、バル
ブ7が開になったとき、内部が負圧になり管17から、
第4図に示すものは管21から、それぞれ下室S2に直
接空気が流入される。What is shown in FIG. 2 is a back washing process, when valve 6 is closed and valve 7 is opened, negative pressure is created inside and from pipe 17,
In the case shown in FIG. 4, air flows directly into the lower chamber S2 from the pipes 21.
関連して説明すれば、可撓性繊維層炉床を形成する繊維
材料としては、可撓性を有する天然まプζは合成繊維何
れにても良く、この繊維束を並列棒状、環状の支持金具
18に逆U字状2、輪状26(第5図)K全面に並べて
、上端を前記支持金具18に固定したもの力・使用され
る。To explain in a related manner, as the fiber material forming the flexible fiber layer hearth, the flexible natural fiber ζ may be any synthetic fiber, and this fiber bundle is supported in parallel rods or in an annular shape. The inverted U-shaped 2 and ring-shaped 26 (Fig. 5) K are lined up on the entire surface of the metal fitting 18, and the upper end is fixed to the support metal fitting 18.
また基布上に毛足を繊り出した、所謂長毛が布を全面に
わたって金網など通液性の支持金具に張りつけたものも
同等の効果を有するものとして使用することができる。Also, a base fabric with so-called long hair, which is attached to a liquid-permeable support such as a wire mesh over the entire surface of the fabric, can also be used as having the same effect.
次に圧着用浮上体としては、一つの例として浮力を有す
る球状、塊状物であるが、本発明の場合、これ自体の炉
床効果性期待しないので、従来の浮上球体炉床のよりは
太き目で、直径0.5〜IOC!m、特に好ましくは2
〜50mの大きさのものが適当であり、これより小さき
に過ぎる七浮力が小さくて逆洗時にスラリーと共に排出
、逸散損失かあり、逆に大きに過ぎるときは繊維層の圧
密時にムラが生じる。材質はガラス質空殻球、高分子質
発泡物塊などが容易に市場で入手可能である。Next, an example of a floating object for crimping is a spherical or lumpy object with buoyancy, but in the case of the present invention, it is not expected to have a hearth effect of its own, so it is thicker than the conventional floating spherical hearth. With fine eyes, diameter 0.5~IOC! m, particularly preferably 2
A size of ~50m is suitable; if the buoyancy is too small, it will be discharged with the slurry during backwashing and there will be loss due to dissipation.On the other hand, if it is too large, unevenness will occur during consolidation of the fiber layer. . Materials such as hollow glass spheres and polymeric foam blocks are easily available on the market.
また圧着用浮上体の他の剥きしては、両端を封じた筒状
空殻体を同等の効果があるものとして挙げることができ
る。この場合、繊維束は第2図および第3図に示すよう
に、濾過槽の壁に固定されている繊維束支持金具18に
上端を、端封筒状空殻体19に下端をそれぞれ接着また
は結びつけて垂下状態にしたものも挙げられる。In addition, as another alternative to the floating body for crimping, a cylindrical empty shell body with both ends sealed can be cited as having the same effect. In this case, as shown in FIGS. 2 and 3, the upper end of the fiber bundle is glued or tied to the fiber bundle support fitting 18 fixed to the wall of the filtration tank, and the lower end to the end envelope-shaped hollow shell 19. There is also one that is in a hanging state.
従って、水位の上、下によって、浮上体も上、下し、固
定されている繊維束支持金真上の間で繊維束は圧密化さ
れたり、解禁・展拡したりすることができる。Therefore, depending on whether the water level rises or falls, the floating body also rises or falls, and the fiber bundle can be consolidated or released/expanded between directly above the fixed fiber bundle support.
第4図、第5図は格子状浮上体27を用い、これの例で
ある。場合により格子状浮上体の上面に、繊維束(2,
26)を均一に圧着するために金網29を全面に張りつ
けることもある。FIG. 4 and FIG. 5 are examples of a grid-like floating body 27. In some cases, a fiber bundle (2,
26), a wire mesh 29 may be applied to the entire surface in order to uniformly press the parts 26).
本発明装置においては、下室に空気を直接導入すること
によって浮上体を下げ、繊維束炉床を充分に伸拡した状
態で、洗滌・再生を行なうので、王室に残る少量の炉水
で効率よく、これを行なうこと力・できるが、懸濁物の
性状によって上室の炉水のみによる洗滌では不充分と思
われる場合にはによる洗滌を併用し、これをさらに完全
、確実にすることもできる。In the device of the present invention, the floating body is lowered by directly introducing air into the lower chamber, and cleaning and regeneration are carried out with the fiber bundle hearth fully expanded and expanded, so it is efficient with the small amount of reactor water remaining in the royal chamber. Although this can often be done, if cleaning with reactor water alone in the upper chamber is insufficient due to the nature of the suspended material, cleaning with reactor water may also be used in combination to make this more complete and reliable. can.
部品の個々の材質、形状、動作と効果については、すで
に本文中にその都度記したが、ここに本発明にかかる装
置を懸濁物の濃縮方法に応用した場合の特徴について記
したい。The materials, shapes, operations, and effects of the individual parts have already been described in the main text, but here I would like to describe the characteristics when the device according to the present invention is applied to a method for concentrating suspended matter.
特徴として挙げられる第一の利点は、本発明装Hにおい
ては、廻転体、炉布の走行、攪拌等の機械的な動作部分
が無い点である。このことは故障が少なく、保守が容易
なこと、真空ポンプ、高圧ポンプ等の補機が少なく、か
つエネルギー消費が少ない点にある。The first advantage cited as a feature is that the apparatus H of the present invention does not have any mechanically moving parts such as rotating bodies, running of the furnace cloth, stirring, etc. This means that there are fewer failures, easier maintenance, fewer auxiliary machines such as vacuum pumps and high-pressure pumps, and less energy consumption.
第二の利点は、濾過圧は原水槽と炉水槽の自然発生水頭
圧差(Hl−H2)のみで可能で、この点からも省エネ
ルギー的である。The second advantage is that the filtration pressure can be achieved only by the naturally occurring head pressure difference (Hl-H2) between the raw water tank and the reactor water tank, and from this point of view as well, it is energy-saving.
第三の利点は、浮上体による圧密繊維束炉床の効果によ
って表層のみならず、縦深的にも懸濁物の捕捉か行なわ
れるので、炉速が比較的高い割に、捕捉容量が大である
ことが挙げられる。また再生・洗滌は浮・上体の降下に
よって繊維束を拡げた状態で行なうので、洗滌効果が大
きいことも挙げられる。The third advantage is that the effect of the consolidated fiber bundle hearth created by the floating body traps suspended matter not only in the surface layer but also in the depth and depth, so the trapping capacity is large despite the relatively high furnace speed. One example is that. Furthermore, since the regeneration and cleaning are performed with the fiber bundles spread out by lowering the float and upper body, the cleaning effect is great.
第四の利点として、下室に空気導入口を設けることによ
って洗滌水量を減らし、洗滌効果をさらに高めることが
でき、本発明か完成されたものである。A fourth advantage is that by providing an air inlet in the lower chamber, the amount of washing water can be reduced and the washing effect can be further enhanced, which is a complete accomplishment of the present invention.
図は本発明の実施の態様を模式的に示したもの第1図は
圧着用球状浮上体を使用した型式の装置の側断面図(濾
過工程)、
第2図は圧着用端封管状浮」皿体を使用した型式の装置
の側断面図(再生完了時)、
第3図(A)は第2図の炉床および浮上体の部分の拡大
図であり、第3図(B)は(A)のM−N線にそっての
断面を示す。
第4図は金網張り格子状浮上体を使用し、シャワー洗滌
を併用した装置の側断面図。
第5図(A)は第4図の炉床および浮上体の部分の拡大
図であり、第5図(B)は第5図(A)のE−Fにそっ
ての断面を示す。
第6図は金網張り環状浮上体の平面図である。
符号説明
1;濾過槽容器 2; 繊維束(逆U字状)3; 球
状浮上体 4; 浮」一体流出防止用多孔板5; 原
水供給口 6: 原水供給バルブ7; 濃縮水排出バ
ルブ 8; 濃縮水貯槽9; 炉水貯槽 lo;
空気出入口貯槽
14; 原水=5七ム」与久」5請、15; 濃縮
水ぢト出管16i x’7.; 空気導入口 18
; 繊維束支持金具19: 端封筒状浮上体 2
0i 繊維束ククI)紐21; 空気導入口 2
2; 浮子式逆止弁23; シャワー用送水ボンフ
。
24; 浮上体吊り下げ用ローツブ 25; 鎖
26; 繊維束(輪状)27; 格子状浮上イ本H
1; 原水貝〒す肴のし八1’、l、 H2コ虻
水!I?f楯めし八″1し第3図The figure schematically shows an embodiment of the present invention. Figure 1 is a side sectional view of a type of device (filtration process) using a spherical floating body for crimping, and Figure 2 is a tubular floating body for crimping. Figure 3 (A) is an enlarged view of the hearth and floating body parts in Figure 2, and Figure 3 (B) is A cross section taken along line M-N of A) is shown. FIG. 4 is a side cross-sectional view of a device that uses a wire mesh lattice-like floating body and also has a shower cleaning function. FIG. 5(A) is an enlarged view of the hearth and floating body portions in FIG. 4, and FIG. 5(B) shows a cross section taken along line EF in FIG. 5(A). FIG. 6 is a plan view of the wire mesh annular floating body. Description of symbols 1; Filtration tank container 2; Fiber bundle (inverted U-shape) 3; Spherical floating body 4; Perforated plate for preventing integral outflow of floats 5; Raw water supply port 6: Raw water supply valve 7; Concentrated water discharge valve 8; Concentrated water storage tank 9; Reactor water storage tank lo;
Air inlet/outlet storage tank 14; Raw water = 57m x'7, 15; Concentrated water outlet pipe 16i x'7. ; Air inlet 18
; Fiber bundle support fitting 19: End envelope-shaped floating body 2
0i Fiber bundle Kuku I) String 21; Air inlet 2
2; Float type check valve 23; Water supply bong for shower. 24; Lobe for suspending the floating body 25; Chain 26; Fiber bundle (ring-shaped) 27; Lattice-shaped floating body H
1; Raw water shellfish 1', l, H2 Kojimizu! I? f tatemeshi 8" 1shi figure 3
Claims (1)
原液によって浮上して上記可撓性繊維束を圧密状に押し
上げることができる浮力浮」−れている特許請求の範囲
第(1)項記載のがa濃縮装置。 (3)ト記浮4二体が端封筒状空殻体を並べて構成され
ている特許請求の範囲第(1)項記載のが過濃縮装置。 (4)上記浮上体が格子状、環状または渦巻状に構成さ
れている特許請求の範囲第(1)項記載の濾過濃縮装置
。 (5)上記浮−L体が前記可撓性繊維束の下端に取り付
けられて(βる特許請求の範囲第(1)項記載の濾過濃
縮装置。 (6)上記浮上体が、前記可撓性繊維束の支持金具より
ロープ、鎖などで吊り下げられている特−設備を内蔵し
ている特許請求の範囲第(1)項記載のが過濃縮装置。 (8)濾過槽を、多数の可撓性繊維を全面に垂下させて
なる通液性炉材床で上下に仕切り、その下室には原液に
より浮上して、上記可撓性繊維を圧密状に押し上げるこ
とができる浮カ浮縮を行なうに際し、濾過すべき原液を
王室から導入し、該原液中に装填した浮上体の浮力によ
って圧密されてか層を形成した炉材中を通過、懸濁物を
濾過・捕集し、炉水は上室から濾過槽外に排出するとと
もに、目詰りした」二記γ戸材を再生するに当っては、
容器下↓に空気を導入しながら炉床下室の原液を抜き出
し、浮上体を降下させることにより、前記可撓性繊維か
らなる炉床を解緊垂下状態にした状態で、炉床上室のろ
液を通過させ、これを洗滌・再生することを特徴とする
濾過濃縮方法Q (9)上記炉床の洗滌・再生に際して、炉床下室の炉水
を通過させるに当り、上室に内蔵したシャワー設備から
の噴射水を併用することを特徴とする特許請求の範囲第
(8)項記載の濾過濃縮方法。[Scope of Claims] (1) A filtration tank is equipped with a buoyancy float that suspends a large number of flexible fibers over the entire surface and is floated by the raw solution to push up the flexible fiber bundles in a consolidated manner. A concentrating device according to claim (1). (3) A superconcentration device according to claim (1), wherein the two floats are constructed by arranging end envelope-like empty shells. (4) The filtration and concentration device according to claim (1), wherein the floating body is configured in a lattice shape, annular shape, or spiral shape. (5) The filtration/concentration device according to claim (1), wherein the floating L body is attached to the lower end of the flexible fiber bundle. (6) The floating body is attached to the lower end of the flexible fiber bundle. The superconcentration device according to claim (1) is a superconcentration device that incorporates special equipment suspended from a support fitting for a sex fiber bundle by a rope, chain, etc. The upper and lower chambers are partitioned by a liquid-permeable furnace material floor made of flexible fibers suspended over the entire surface, and the lower chamber has a floater that floats with the raw solution and pushes up the flexible fibers in a compacted manner. When carrying out this process, the undiluted solution to be filtered is introduced from the royal family, passed through the furnace material which has been consolidated to form a layer by the buoyancy of floating bodies loaded in the undiluted solution, filtered and collected suspended matter, and passed through the furnace material. Water is discharged from the upper chamber to the outside of the filtration tank, and when recycling the clogged door material,
The filtrate in the upper hearth chamber is drawn out while introducing air below the container, and the floating body is lowered to bring the hearth made of flexible fibers into a suspended state. A filtration/concentration method Q characterized in that the water is passed through, and then washed and regenerated. The filtration and concentration method according to claim (8), characterized in that water jetted from the filter is used in combination.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58040945A JPS59166218A (en) | 1983-03-12 | 1983-03-12 | Method and device for filtering and thickening |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58040945A JPS59166218A (en) | 1983-03-12 | 1983-03-12 | Method and device for filtering and thickening |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59166218A true JPS59166218A (en) | 1984-09-19 |
Family
ID=12594643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58040945A Pending JPS59166218A (en) | 1983-03-12 | 1983-03-12 | Method and device for filtering and thickening |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59166218A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102847353A (en) * | 2011-10-28 | 2013-01-02 | 南通天华和睿科技创业有限公司 | Sewage filter system with backwash device |
-
1983
- 1983-03-12 JP JP58040945A patent/JPS59166218A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102847353A (en) * | 2011-10-28 | 2013-01-02 | 南通天华和睿科技创业有限公司 | Sewage filter system with backwash device |
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