JP2005103487A - Filter press, filtration apparatus using it and method for washing it - Google Patents

Filter press, filtration apparatus using it and method for washing it Download PDF

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Publication number
JP2005103487A
JP2005103487A JP2003343174A JP2003343174A JP2005103487A JP 2005103487 A JP2005103487 A JP 2005103487A JP 2003343174 A JP2003343174 A JP 2003343174A JP 2003343174 A JP2003343174 A JP 2003343174A JP 2005103487 A JP2005103487 A JP 2005103487A
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Prior art keywords
water
filter
filter medium
filtration
medium layer
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JP2003343174A
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Japanese (ja)
Inventor
Yuichi Fuchu
Kenichi Futami
Tomohiro Takahashi
Yuji Tsukamoto
賢一 二見
祐二 塚本
裕一 府中
知広 高橋
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Ebara Corp
株式会社荏原製作所
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Priority to JP2003343174A priority Critical patent/JP2005103487A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter press that is free from a problem of insufficient washing and can be washed with a small amount of water in a short time, a filtration apparatus using it, and an operating method of the apparatus. <P>SOLUTION: The filter press 1 is equipped with a filter medium layer 2 composed of a filter medium that sinks in water therein, a screen 5 for preventing the filter medium from leaking at the bottom of the filter medium layer and a helical rotating body 4-2 with a speed reducer between the bottom and the top surface of the filter medium layer. The filter medium is preferably cylinder- or square-pillar-shaped pellets made of a synthetic resin with its specific gravity adjusted to be 1.6 to 3.0 by mixing with a specific gravity conditioner. The above filter press 1 of the filtration apparatus is equipped with an air vent pipe at the top, a drain trough connecting with an upper raw-water tank and a discharge pipe for backwash water that also serves as a raw-water feeding pipe, an intermediate pipe for water discharge at the top of the filter medium layer, and a discharge pipe for treated water that also serves as a feeding pipe for backwash water and an air inlet pipe under the screen. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pressure filter for filtering water to be treated containing suspended substances, a filtration device using the same, and a cleaning method thereof.

The conventional technology will be described by taking filtration using white water in a paper pulp factory as treated water as an example.
The filter for white water filtration is a two-layer filtration of sand and anthracite for white water that has been coagulated and precipitated with an inorganic flocculant or a polymer flocculant. In addition, it is common to have a surface washing device or a surface layer agitator.
For example, the following specifications are generally performed.
Filtration rate (LV): 10-20 m / h
Filter medium; sand (effective diameter 1.0-2.0mm, filling height 300-400mm)
Anthracite (effective diameter 2.0-4.0mm, filling height 600-800
mm)
Filter media support means; Gravel cleaning method; air cleaning, simultaneous air / water cleaning, water cleaning
Or use a surface agitator)
Time required for cleaning and amount of water required: 20 to 30 min, 10 m 3 / m 2

  In general, the filtration treatment often involves surface filtration that traps most suspended substances near the surface of the filter medium. Suspended substances trapped near the surface layer of the filter medium layer are hardened by water pressure as filtration continues. This tendency is particularly remarkable when, for example, paper pulp factory white water containing cellulose fibers is treated water. In this way, suspended solids that have been consolidated in the vicinity of the surface layer of the filter medium layer are difficult to separate from the filter medium and to be refined by ordinary filter medium cleaning, and eventually cause poor cleaning. Cheap.

In the filtration treatment, if the filtration rate is fast, for example, 40 m / h or more, the filter medium layer is clogged quickly, and frequent filter medium cleaning is required. For example, when the SS concentration of the water to be treated is about 40 mg / L, frequent filter media cleaning is required about once every 1-2 hours. Moreover, even if it is 10-20 m / h which is a normal filtration rate, when SS density | concentration of to-be-processed water is high, for example, when SS density | concentration is about 100 mg / L, it is the frequency of about once every 1-2 hours similarly. Clean filter media is required.
However, in the conventional filter, the time required for cleaning the filter medium is as long as 20 to 30 min, and the amount of water required for cleaning is as large as about 10 m 3 / m 2. In addition, the device operation rate has decreased significantly. For this reason, in the conventional filter, the upper limit was about 10 to 20 m / h for the filtration rate and about 40 mg / L for the raw water SS concentration. If the filtration rate is slow, the filtration area must be increased.
Therefore, in order to reduce the device installation space, it is desired to speed up the filtration process. In order to achieve this, establishment of a technique capable of cleaning the filter medium in a short time with a small amount of water is desired.

  Further, when the frequency of cleaning the filter medium increases, the wear and pulverization of the anthracite used as the filter medium becomes remarkable. For this reason, it is necessary to replace or replenish the anthracite at regular intervals, resulting in a running cost. Therefore, in order to carry out cleaning of the filter medium more frequently than before, it is desired to use a filter medium having higher mechanical strength than anthracite.

When pre-treating sand filtration equipment or when treating a large amount of treated water urgently, for example, when treating overflow water from a combined sewer system, rather than obtaining clear treated water, Roughing may be required. For example, when the SS water to be treated for sand filtration is 100 mg / L, a device equipped with a function for roughing suspended substances up to about SS 40 mg / L, which is the applicable range of sand filtration, is necessary as pretreatment for sand filtration. It is said. As a device equipped with a function for roughly removing suspended substances, a pressure levitation device and a disk filter have been put to practical use so far. Area required.
Therefore, it is desired to develop a roughing device for suspended solids that has a high processing speed and can reduce the installation area.
Japanese Patent No. 2509895 JP 2000-126515 A JP 2003-210911 A

  In view of the above prior art, the present invention is to provide a pressure filter that can avoid the problem of poor cleaning in a filter and can be cleaned with a small amount of water for a short time, a filtering device using the pressure filter, and a cleaning method therefor. And

In order to solve the above problems, in the present invention, a filter medium layer constituted by a filter medium that sinks in water is provided inside, and a screen for preventing the filter medium outflow is provided at the bottom of the filter medium layer. The pressure filter is characterized in that a rotating body with a reduction gear having a helical shape is provided from the lower part of the filter medium layer to the surface layer of the filter medium layer.
As the filter medium constituting the filter medium layer, cylindrical or prismatic pellets in which a specific gravity adjusting agent is mixed with a synthetic resin and the specific gravity is adjusted to 1.6 to 3.0 can be used.
Further, in the present invention, in the pressure filter, a drainage trough also serving as a raw water inflow pipe connected to a raw water tank and a backwash water discharge pipe at the top, and the drainage trough and the surface layer of the filter medium in the pressure filter A filtration device comprising an intermediate drain pipe, a treated water outflow pipe serving as a backwash water inflow pipe connected to a treated water tank at the bottom of the screen, and a backwash air inflow pipe Is.
Furthermore, in the present invention, in the filtration method of the filtration device, the filtration medium layer contaminated by the filtration treatment is first drained by an intermediate drain pipe installed above the surface of the filtration medium layer, and the water level in the filter After the air is introduced, air is introduced from the bottom of the filter, and then, while rotating the rotating body, cleaning water and air are introduced simultaneously from the bottom of the filter, and the water level in the filter is determined in advance. After reaching the required level, stop the introduction of cleaning water and air, let it stand for a certain period of time, then introduce the cleaning water from the bottom of the filter while rotating the rotating body and install it on the top of the filter It is made into the washing | cleaning method of the filtration apparatus characterized by discharging from the drained trough.

According to the present invention, the following effects can be achieved.
(1) By rotating the spiral rotating body during filter media cleaning, the entire filter media layer is forcibly agitated and mixed to improve the cleaning performance, enabling reliable cleaning in a short amount of water and in a short time. It becomes.
(2) Since the filter media can be washed in a small amount of water and in a short time, even if the water flow rate is made faster than before and the filter media is washed frequently, a high water recovery rate and equipment operation rate Can be obtained. The installation area of the apparatus can be reduced by increasing the water flow rate.
(3) By using a filter material made of a synthetic resin having high mechanical strength, the filter medium is not worn or crushed, and it is not necessary to replenish the filter medium periodically.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a flow configuration diagram showing an example of a filtration device using the pressure filter of the present invention. Inside the filter 1, a rotating body 4-2 having a spiral shape is installed from the lower part of the filter medium layer 2 to the surface layer of the filter medium layer 2. The rotating body 4-2 is joined to the rotating shaft 4-1 by a joining rod 4-3. This rotating body 4-2 is for forcibly stirring and mixing the entire filter medium layer at the time of cleaning the filter medium to improve the cleaning performance. By making the shape of the rotator spiral, the filter medium conveyed to the upper part of the filtration layer by the rotation of the rotator is conveyed to the center of the filter. By continuously rotating the rotating body 4-2, the filter medium on the outer periphery of the filter medium layer 2 is continuously conveyed to the center of the filter, and by this action, the entire filter medium layer 2 is efficiently stirred and mixed. Is done.
Since the agitation / mixing of the filter medium layer 2 is made more efficient, it is possible to clean more reliably in a shorter amount of water and in a shorter time than in the past.

  For the filter medium layer 2, pellets prepared by mixing a specific gravity adjusting agent with a synthetic resin and adjusting the specific gravity to 1.6 to 3.0 are used as the filter medium. The reason why the synthetic resin is selected as the material for the filter medium is to increase the mechanical strength of the filter medium. By using a synthetic resin, even when the filter medium is rotated and the filter medium layer is vigorously stirred and mixed during cleaning of the filter medium, the filter medium is hardly crushed or worn. The reason for adjusting the specific gravity to 1.6 to 3.0 is that if the specific gravity is less than 1.6, the filter medium may violently fluctuate when the filter medium is washed, and the filter medium may flow out of the filter. It is. Moreover, when specific gravity exceeds 3.0, even if it rotates the rotary body 4-2 at the time of filter medium washing | cleaning, a filter medium will not be mixed well, but there exists a possibility of causing a cleaning defect. In order to reduce the torque of the rotating body, the specific gravity of the filter medium is preferably 3.0 or less. The shape of the filter medium is cylindrical or prismatic. The diameter and length of the filter medium are selected in the range of 1 to 5 mm according to the particle size distribution of the suspended matter to be removed. For example, when white water in a paper valve factory is treated, the diameter and length of the filter medium is optimally 3 to 4 mm.

  At the bottom of the filter medium layer, a screen 5 for preventing the filter medium outflow is installed. The screen may use a wedge wire. Many conventional filters use gravel as a support method (outflow prevention method) for the filter medium. However, gravel has a large specific gravity, and the gravel does not move at all when the filter medium is washed. Therefore, dirt adhering to the gravel is difficult to be washed and dirt tends to accumulate. Since the inside of the filter tends to be anaerobic, if dirt accumulates in the gravel part, problems such as generation of hydrogen sulfide odor are likely to occur. However, in the case of a screen (wedge wire), the dirt adhering to the screen is likely to be removed due to the high flow rate of the washing water when the filter medium is washed. For this reason, accumulation of dirt is less likely to occur.

Next, a filtration method using the filtration device of FIG. 1 will be described. The treated water stored in the raw water tank 7 is introduced into the filter through the drainage trough 15. The introduction speed of the water to be treated, that is, the filtration speed is set in the range of 20 to 100 m / h according to the required water quality (SS concentration) of the treated water. For example, if it is desired to obtain clear treated water having an SS concentration of 10 mg / L or less with respect to the treated water having an SS concentration of 100 mg / L, the treatment speed is slowed, for example, about 20 m / h, and an SS concentration of about 30 mg / L. When the purpose is to roughen the suspended matter so as to obtain the treated water, the treatment speed is high, for example, about 100 m / h.
Suspended substances are removed from the water to be treated introduced into the filter as it passes through the filter medium layer 2, and then discharged through the filter medium outflow prevention screen 5 as treated water to the outside of the filter.

When filtration is performed for a certain period of time, the filter medium layer is clogged with suspended substances, and the filtration resistance increases. From this, after processing for a certain period of time, or when the filtration resistance reaches a preset resistance value, for example, 20 to 100 kPa, it is necessary to wash the filter medium and return the filtration resistance to the initial value. . Hereinafter, the cleaning method for the filter medium will be described.
The cleaning method for the filter medium mainly includes the following steps.
(1) Step of lowering the water level in the filter (2) By introducing air / cleaning water from the bottom of the filter, the suspended substances captured by the filter medium layer are separated from the filter medium, and from the filter medium Step (3) for refining exfoliated suspended matter (3) Step for discharging suspended material exfoliated and refined from the filter medium to the outside of the filter by the steps of (2)

Each step will be described in detail.
(1) Step of reducing the water level in the filter First, the raw water pump P-1 is stopped, and the raw water valve 8A and the treated water valve 9A are closed to stop the filtration process. After leaving still for a certain time, for example, about 0.5 min, the air vent valve 10A is opened, the water in the filter is discharged from the drain trough 15 and the intermediate drain pipe 16, and the water level is lowered to about 200 mm above the surface of the filter medium layer. . At this time, the water may be drained not from the intermediate drain pipe 16 but from the drain pipe 14 at the bottom of the filter.

(2) A step of peeling the suspended matter trapped in the filter material layer from the filter material by introducing air 13 and cleaning water 11 from the bottom of the filter, and further miniaturizing the suspended material. Air is introduced from the bottom of the filter. The purpose of this step is to peel off the suspended substance trapped in the filter medium layer from the filter medium by bubbles passing through the filter medium layer, and to refine the suspended substance. However, only in this step, the refinement of the suspended matter trapped in the filter medium layer is still incomplete. Therefore, after the introduction of air is continued for 0.5 to 2 minutes, in addition to the air, the cleaning water 11 is introduced from the lower part of the filter medium layer until just before the water level reaches the drainage trough 15, and the rotating body 4-2. Rotate. At this time, the mixing / stirring of the filter medium may be mainly due to the effect of the rotating body 4-2, and the introduction amount of the cleaning water may be a small amount of water so that the filter medium is not mixed / stirred only by the cleaning water. . For example, the amount of cleaning water introduced may be about 0.5 to 1.0 m 3 / m 2 . The rotational speed of the rotating body is reduced by the speed reducer 17 and is reduced, for example, about 3 to 10 min −1 . This shape of the rotating body that has a spiral shape, because the filter medium of the filter material layer peripheral portion is conveyed to the central portion of the filter material layer, efficiently filtering material is mixed and stirred, 3~10Min - This is because even when the rotational speed is as low as about 1 , a sufficient filter medium cleaning effect can be obtained.
By reducing the rotation speed of the rotating body, the collision between the rotating body and the filter medium is alleviated, so the burden on the filter medium is reduced and the filter medium is less likely to be worn and crushed. Conventionally, the process of peeling / miniaturizing suspended solids using air and water, and in some cases using a surface wash, etc., takes about 3 to 10 minutes, but it is efficient to use a rotating body together. In this method, exfoliation and miniaturization of the suspended substance can be achieved in a short time of 1 to 2 minutes.

(3) After the step (2) of discharging the exfoliated / miniaturized suspended matter from the filter medium to the outside of the filter by the step (2), the material is allowed to stand for a certain period of time. The purpose of this is to settle the air, the water for washing, and the filter medium soared by the rotation of the rotating body, and the time is suitably 0.5 to 2 min.
Next, the process of discharging the suspended substance separated and refined from the filter medium to the outside of the filter will be described. Washing water is introduced from the lower part of the filter medium layer, and this washing water is continuously discharged from the drain trough 15 as washing wastewater. At this time, the rotating body 4-2 is rotated in parallel with the introduction of the cleaning water. The introduction rate of the cleaning water at this time is about twice the introduction rate in the step (2), that is, about 1.0 to 2.0 m 3 / m 2 . This is intended to reduce the time required for discharging suspended substances out of the system by increasing the introduction speed and to efficiently discharge suspended substances having a large specific gravity. In addition, with the introduction of the washing water, the rotating body 4-2 is used for the purpose of stirring and mixing the filter medium so that the suspended substance at the bottom of the filter medium layer can be discharged out of the filter efficiently in a short time. Rotate.
The time for which this process is continued is set by periodically monitoring the turbidity or SS concentration of the cleaning wastewater discharged from the drainage trough 15 and confirming the time until the cleaning wastewater becomes clear. In addition, although it changes with the property of to-be-processed water and the contamination condition of a filter medium, about 3 to 5 minutes are suitable for a continuation time in many cases.

Hereinafter, a method of rotating the rotating body 4-2 in the step (3) will be described. In this step, the rotating body 4-2 is rotated for the purpose of stirring and mixing the filter medium so that the suspended substance at the bottom of the filter medium layer can be efficiently discharged out of the filter in a short time.
For this reason, it is desirable to continuously rotate the rotating body from the start to the end of this step. The rotational speed at this time is preferably about 6 to 10 min −1 if the main focus is to efficiently discharge the suspended substance at the bottom of the filter medium layer to the outside of the filter. However, although depending on the introduction speed of the washing water and the specific gravity of the filter medium, at a rotational speed of about 6 to 10 min −1 , the filter medium may rise and the filter medium may flow out of the drainage trough 15.
In this case, after the step (2) is completed, the water in the filter is discharged from the intermediate drain pipe 16 or the drain pipe 14 at the bottom of the filter, and the water level is lowered to about 200 mm above the surface of the filter medium layer.
Thereafter, the step (3) is performed. At this time, the rotating body is rotated at a rotational speed of about 6 to 10 min −1 until the water level reaches the drainage trough 15, and the water level reaches the drainage trough 15. Immediately before the rotation, the rotational speed is reduced to about 1 to 3 min −1 or the rotation is stopped. That is, while the cleaning wastewater is being discharged from the drainage trough 15, by slowing down the rotation speed of the rotating body, it is possible to prevent the filter medium from flowing out while minimizing the reduction in cleaning ability.

  After the step (3) is completed, the raw water valve 8A is opened, the raw water pump P-1 is started, and the inside of the filter is filled with water. After the inside of the filter is full of water, the air vent valve 10A is closed, the treated water valve 9A is opened, and the filtration process is started.

Hereinafter, the present apparatus will be specifically described by way of examples.
In this embodiment, the filtration apparatus of FIG. 1 is used, and the paper pulp mill papermaking white water is treated water, and the filtration treatment and the filter medium cleaning are performed.
Processing conditions and filter specifications are as follows.
Filter; pressure filter φ600mm × 3,000mmH (body length),
Filter material: Cylindrical (4 mm) resin (polyethylene rubber) with specific gravity adjusted to 2.0
(Recall type) filter media,
The filter medium is a single layer, the filling height is 1,500 mm,
Raw water; paper making white water (disc filter clear water; SS61-120mg / L)
,
Filtration rate (LV); 40-100 m / h,
Rotating body shape: Stainless steel plate with a width of 50 mm is processed into a spiral shape (Fig. 1),
The rotating body is deployed from the bottom of the filter media layer to the surface of the filter media layer,

The processing conditions are shown in Table 1.

Example 1
The test results at a filtration rate (LV) of 40 m / h (= 0.67 m / min) are shown in FIG.
With respect to the raw water SS concentration of 76 to 108 mg / L, the treated water SS after 90 minutes from the start of water flow was 8 mg / L (SS removal rate 92%), and the treated water had good water quality. Thereafter, the treated water SS was 18 mg / L (SS removal rate 79%) after 120 minutes from the start of water flow, and the treated water SS after 180 minutes after starting water flow was 23 mg / L (SS removal rate 79%). Gradually deteriorated with the passage of filtration time.
Water flow was stopped in 180 minutes after the start of water flow, and the filter medium was washed according to the sequence shown in Table 1. Due to the air cleaning in Step 3 and the simultaneous cleaning in Step 4, the suspended substances captured in the filter medium layer were peeled and refined from the filter medium. Further, in the water washing in Steps 6 and 7, the suspended matter captured at the bottom of the filter medium layer by rotating the rotating body was also successfully discharged out of the filter in a short time of 3 minutes.
According to this result, the filtration treatment under these conditions can be applied even when it is necessary to obtain a clear treated water of treated water SS10 mg / L or less. At this time, since the treated water SS deteriorates in the filtration time of 90 to 100 minutes, it can be seen that it is desirable to carry out the filter media cleaning in the water passage time of about 90 minutes.
In addition, since this apparatus employs an efficient cleaning method in which a rotating body is rotated, the time required for cleaning the filter media is 7 minutes, and the amount of water required for cleaning is 5.3 m 3 / m 2 for a short time with a small amount of water. And reliable cleaning was possible. Based on this calculation, when the filtration treatment was performed at LV 40 m / h and the filter medium was washed with a water passage time of 90 minutes, the water recovery rate was 91% and the device operation rate was 92%. In addition, when filtration processing and filter material washing are performed under the same conditions with a conventional filter, the water recovery rate is about 85% and the device operation rate is about 80%.・ It can be seen that the required amount of water is very good.

Example 2
The test results at a filtration rate (LV) of 80 m / h (= 1.3 m / min) are shown in FIG.
Under the conditions of the raw water SS concentration of 61 to 120 mg / L, the treated water SS concentration after starting water passage 60 min is 22 mg / L (SS removal rate 65%), and the treated water SS at 100 min after starting water passing is 32 mg / L (SS The removal rate was 62%.
Even at a high-speed treatment of LV 80 m / h, an SS removal rate of 62% was obtained in 100 minutes after the start of water flow, so that it is not always necessary to obtain clear treated water, and it is possible to roughen suspended substances. When required, it can be seen that this apparatus can process at a high speed of 80 m / h.
In addition, when it filters with LV80m / h and the filter medium washing | cleaning is implemented by water flow time 100min, a water recovery rate is 96%, and a device operation rate is 93%, and it is very favorable.

The flow block diagram which shows an example of the filtration apparatus using the pressure filter of this invention. The graph which shows the test result in Example 1 with the filtration rate (LV) of 40 m / h. The graph which shows the test result in Example 2 with the filtration rate (LV) of 80 m / h.

Explanation of symbols

  1: pressure filter, 2: filter medium layer, 3: motor, 4-1: rotating shaft, 4-2: rotating body, 4-3: connecting rod between rotating shaft and rotating body, 5: prevention of filtering medium outflow Screen: 6: Backwash water discharge pipe, 7: Raw water tank, 8: Raw water pipe, 9: Treated water pipe, 10: Air vent pipe, 11: Backwash water inflow pipe, 12: Treated water tank, 13: Reverse Air-washing pipe, 14: Drain pipe, 15: Drain trough, 16: Intermediate drain pipe, 17: Reducer

Claims (4)

  1. It has a filter medium layer composed of a filter medium that sinks in water, and a screen for preventing the filter medium outflow is provided at the bottom of the filter medium layer, and the filter medium layer is formed from the lower part of the filter medium layer. A pressure-type filter, characterized in that a rotating body with a speed reducer having a helical shape is provided up to the surface layer.
  2. The filter medium constituting the filter medium layer is a cylindrical or prismatic pellet in which a specific gravity adjusting agent is mixed with a synthetic resin and a specific gravity is adjusted to 1.6 to 3.0. The pressure-type filter as described.
  3. The pressure type filter according to claim 1 or 2, wherein a drainage trough also serving as a raw water inflow pipe connected to a raw water tank and a backwash water discharge pipe at the top, the drainage trough and the filter medium layer at the top. A filtration apparatus comprising an intermediate drain pipe between the surface layer, a treated water outflow pipe serving as a backwash water inflow pipe connected to a treated water tank at a lower portion of the screen, and a backwash air inflow pipe.
  4. 4. The method of cleaning a filtration device according to claim 3, wherein the filter medium layer contaminated by the filtration treatment is first drained by an intermediate drain pipe installed above the surface layer of the filter medium layer to lower the water level in the filter. Then, while introducing air from the bottom of the filter, and then rotating the rotating body, water for washing and air are simultaneously introduced from the bottom of the filter, and the water level in the filter is set at a predetermined level. After stopping the introduction of cleaning water and air and letting it stand for a certain period of time, while rotating the rotating body, the cleaning water was introduced from the bottom of the filter and installed at the top of the filter A method for cleaning a filtration device, characterized by being discharged from a drainage trough.
JP2003343174A 2003-10-01 2003-10-01 Filter press, filtration apparatus using it and method for washing it Pending JP2005103487A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011240342A (en) * 2006-04-21 2011-12-01 Maezawa Ind Inc Wastewater treatment apparatus
CN104667599A (en) * 2015-02-10 2015-06-03 张晓荣 Filtering device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011240342A (en) * 2006-04-21 2011-12-01 Maezawa Ind Inc Wastewater treatment apparatus
JP2011245483A (en) * 2006-04-21 2011-12-08 Maezawa Ind Inc Filtration device
CN104667599A (en) * 2015-02-10 2015-06-03 张晓荣 Filtering device

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