CN103566652B - Be beneficial to sedimeter and the method for backwash - Google Patents
Be beneficial to sedimeter and the method for backwash Download PDFInfo
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- CN103566652B CN103566652B CN201310529138.6A CN201310529138A CN103566652B CN 103566652 B CN103566652 B CN 103566652B CN 201310529138 A CN201310529138 A CN 201310529138A CN 103566652 B CN103566652 B CN 103566652B
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Abstract
The invention discloses a kind of filter efficiency higher and sedimeter and the method for filter core pollution problem can be improved.This filter is a kind of sedimeter being beneficial to backwash, it comprises the filter assemblies be positioned on a circulation stream, in the running of this filter assemblies, when liquid to be filtered from inside to outside by filter core and from the 3rd port discharge filtered fluid time, filter assemblies is in filtration condition, when backwash liquor enter the 4th port and ecto-entad by filter core time, filter assemblies is in backwash state, the filtration condition of filter assemblies and the switching of backwash period of state, and, described second port is connected by an operational mode switching control valve with between circulation stream, be in the process of filtration condition at filter assemblies, this operational mode switching control valve close all the time or at least partial period be close, and be in the process of backwash state at filter assemblies, this operational mode switching control valve is opened.
Description
Technical field
The present invention relates to a kind of sedimeter and the method that are beneficial to backwash.
Background technology
Filter core form the most conventional in liquid filtering field has two kinds, a kind of for closing and the tubular filter core of the other end opening one end, it is arranged in the shell of filter assemblies by the orifice plate of openend, during filtration, liquid to be filtered permeates under the effect of the pressure in the cavity of the lateral filter core of filter core, and then flow out from the openend of filter core, become filtered fluid, another kind is the tubular filter core of both ends open, it is arranged in the shell of filter assemblies by the orifice plate at two ends, closed cavity is formed between filter core and shell, during filtration, liquid to be filtered enters in the cavity of this filter core from the front end of filter core under the effect of the pressure, then flow along this cavity to the rear end of filter core, in the process, liquid to be filtered permeates (entering to go out namely) from the inner side cavity of filter core to the closed cavity between filter core and shell, and then flow out from the opening this closed cavity, become filtered fluid, liquid being filtered is not had in filter core cavity, then to continue the rear end flowing towards filter core and become concentrate gradually, then concentrate flows out from filter core rear end, after a circulation stream, (wherein can fill into new liquid to be filtered) again and again get back to again filter core front end, circulation like this.
The filter type of the first filter core above-mentioned belongs to usually said " end-filtration " (also referred to as dead-end filtration), and the filter type of the second filter core belongs to " cross-flow filtration ".The feature of end-filtration is that when filtering, liquid to be filtered is move with the direction perpendicular to filter element filtering face substantially, therefore, the advantage of this filter type is that the rate of filtration is fast, filter efficiency is higher, and allow higher concentration polarization, but it is fast that the filter cake that shortcoming is cartridge surface forms speed, filtration resistance increases rapidly, need the backwash carrying out filter core frequently, simultaneously, substantially lean on the reverse impact of backwash liquor to remove the particle on filter core during backwash, the backwash effect of filter core is often not ideal, causes filter core pollution problem to be given prominence to.And the feature of cross-flow filtration is that when filtering, liquid to be filtered moves with the direction being parallel to filter element filtering face, therefore, liquid to be filtered will produce certain shearing force when flowing through filter element filtering face thus the particle that filtering surface is detained be taken away, cake layer is made to remain on a thinner level, reduce filter core to pollute and backwash frequency, but this mode need circulate to feed liquid, not only energy consumption is higher and filter efficiency is often also undesirable.
Summary of the invention
It is higher and can improve sedimeter and the method for filter core pollution problem that technical problems to be solved in this application are to provide filter efficiency.
The first sedimeter of the application, comprise the filter assemblies be positioned on a circulation stream, this filter assemblies comprise shell and be arranged at least one both ends open in this shell and within to enter to go out the filter core that form filters, described shell is provided with the first port as liquid to be filtered input, as the second port of concentrate output, as filtered fluid output the 3rd port and doubled as by the 3rd port or independent the 4th port as backwash liquor input arranged, first port be connected with circulation stream and with the conducting of filter core front end, second port be connected with circulation stream and with the conducting of filter core rear end, 3rd port and the 4th port and the closed cavity conducting formed between filter core and shell, in the running of this filter assemblies, when liquid to be filtered from inside to outside by filter core and from the 3rd port discharge filtered fluid time, filter assemblies is in filtration condition, when backwash liquor enter the 4th port and ecto-entad by filter core time, filter assemblies is in backwash state, the filtration condition of filter assemblies and the switching of backwash period of state, and, described second port is connected by an operational mode switching control valve with between circulation stream, be in the process of filtration condition at filter assemblies, this operational mode switching control valve at least once switches, thus make conversion operation between first filtered model of filter assemblies under operational mode switching control valve is in closed condition and the second filtered model under operational mode switching control valve is in opening.
The first liquid filter method of the application, use sedimeter, this sedimeter comprises the filter assemblies be positioned on a circulation stream, this filter assemblies comprise shell and be arranged at least one both ends open in this shell and within to enter to go out the filter core that form filters, described shell is provided with the first port as liquid to be filtered input, as the second port of concentrate output, as filtered fluid output the 3rd port and doubled as by the 3rd port or independent the 4th port as backwash liquor input arranged, first port be connected with circulation stream and with the conducting of filter core front end, second port be connected with circulation stream and with the conducting of filter core rear end, 3rd port and the 4th port and the closed cavity conducting formed between filter core and shell, in the running of this filter assemblies, when liquid to be filtered from inside to outside by filter core and from the 3rd port discharge filtered fluid time, filter assemblies is in filtration condition, when backwash liquor enter the 4th port and ecto-entad by filter core time, filter assemblies is in backwash state, the filtration condition of filter assemblies and the switching of backwash period of state, and, described second port is connected by an operational mode switching control valve with between circulation stream, be in the process of filtration condition at filter assemblies, this operational mode switching control valve at least once switches, thus make conversion operation between first filtered model of filter assemblies under operational mode switching control valve is in closed condition and the second filtered model under operational mode switching control valve is in opening.
The first sedimeter of the application and method, be in the process of filtration condition at filter assemblies, operational mode switching control valve is at least once switched, when operational mode switching control valve is under closed condition, filter assemblies runs with the first filtered model, now, cut off owing to being run pattern switching control valve between the second port of filter assemblies and circulation stream, therefore, the liquid to be filtered entering filter core towards filter core movement outside, can only be equivalent to end-filtration mode, when operational mode switching control valve is under initial state, filter assemblies runs with the second filtered model, now, owing to being run the conducting of pattern switching control valve institute between the second port of filter assemblies and circulation stream, therefore, the liquid to be filtered entering filter core flows along this filter core cavity to the rear end of filter core, in the process, liquid to be filtered permeates from the inner side cavity of filter core to the closed cavity between filter core and shell, liquid being filtered is not had in filter core cavity, then to continue the rear end flowing towards filter core and become concentrate gradually, finally get back to filter core front end again to filter, be equivalent to cross-flow filtration mode.Thus, by the switching to operational mode switching control valve, make filter assemblies under filtration condition, organically combine the feature of end-filtration mode and cross-flow filtration mode, thus both utilized the fast advantage of the end-filtration rate of filtration to guarantee filter efficiency, utilize again cross-flow filtration to produce the few advantage of filter cake and guarantee that less filter core pollutes.
The second sedimeter of the application is a kind of sedimeter being beneficial to backwash, it comprises the filter assemblies be positioned on a circulation stream, this filter assemblies comprise shell and be arranged at least one both ends open in this shell and within to enter to go out the filter core that form filters, described shell is provided with the first port as liquid to be filtered input, as the second port of concentrate output, as filtered fluid output the 3rd port and doubled as by the 3rd port or independent the 4th port as backwash liquor input arranged, first port be connected with circulation stream and with the conducting of filter core front end, second port be connected with circulation stream and with the conducting of filter core rear end, 3rd port and the 4th port and the closed cavity conducting formed between filter core and shell, in the running of this filter assemblies, when liquid to be filtered from inside to outside by filter core and from the 3rd port discharge filtered fluid time, filter assemblies is in filtration condition, when backwash liquor enter the 4th port and ecto-entad by filter core time, filter assemblies is in backwash state, the filtration condition of filter assemblies and the switching of backwash period of state, and, described second port is connected by an operational mode switching control valve with between circulation stream, be in the process of filtration condition at filter assemblies, this operational mode switching control valve close all the time or at least partial period be close, and be in the process of backwash state at filter assemblies, this operational mode switching control valve is opened.
The second liquid filter method of the application, use sedimeter, this sedimeter comprises the filter assemblies be positioned on a circulation stream, this filter assemblies comprise shell and be arranged at least one both ends open in this shell and within to enter to go out the filter core that form filters, described shell is provided with the first port as liquid to be filtered input, as the second port of concentrate output, as filtered fluid output the 3rd port and doubled as by the 3rd port or independent the 4th port as backwash liquor input arranged, first port be connected with circulation stream and with the conducting of filter core front end, second port be connected with circulation stream and with the conducting of filter core rear end, 3rd port and the 4th port and the closed cavity conducting formed between filter core and shell, in the running of this filter assemblies, when liquid to be filtered from inside to outside by filter core and from the 3rd port discharge filtered fluid time, filter assemblies is in filtration condition, when backwash liquor enter the 4th port and ecto-entad by filter core time, filter assemblies is in backwash state, the filtration condition of filter assemblies and the switching of backwash period of state, described second port is connected by an operational mode switching control valve with between circulation stream, be in the process of filtration condition at filter assemblies, this operational mode switching control valve close all the time or at least partial period be close, and be in the process of backwash state at filter assemblies, this operational mode switching control valve is opened.
The second sedimeter of the application and method, when filter assemblies is in filtration condition, operational mode switching control valve is closed all the time or is at least closed at partial period, now, cutting off owing to being run pattern switching control valve between the second port of filter assemblies and circulation stream, therefore, the liquid to be filtered entering filter core can only towards filter core movement outside, be equivalent to end-filtration mode, thus both utilize the fast advantage of the end-filtration rate of filtration to guarantee filter efficiency, when filter assemblies is in backwash state, operational mode switching control valve is opened, now, owing to being run the conducting of pattern switching control valve institute between the second port of filter assemblies and circulation stream, in the process of backwash liquor reverse impact filter core from outside to inside, the backwash liquor being entered into cavity inside filter core by filter core outer surface is moved along the direction being parallel to filter element filtering face to the second port of filter assemblies, backwash liquor can produce certain shearing force when flowing through filter element filtering face thus the particle that filtering surface is detained is taken away, improve backwash effect thus, effective filter core that improves pollutes.
Below in conjunction with the drawings and specific embodiments, the present invention is described further.The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Fig. 1 is the structural representation of the application's sedimeter.
Fig. 2 is the duty schematic diagram over time of operational mode switching control valve in the embodiment of the present application 1.
Fig. 3 is the duty schematic diagram over time of operational mode switching control valve in the embodiment of the present application 2.
Fig. 4 is the duty schematic diagram over time of operational mode switching control valve in the embodiment of the present application 3.
Fig. 5 is the duty schematic diagram over time of operational mode switching control valve in the embodiment of the present application 4.
In Fig. 2-5, dash area represents the state that operational mode switching control valve 3 is just residing.
Detailed description of the invention
As shown in Figure 1, sedimeter comprises the filter assemblies 2 be positioned on a circulation stream 1, this filter assemblies 2 comprise shell 201 and at least one both ends open being arranged in this shell 201 and within to enter to go out the filter core 202 that form filters, described shell 201 is provided with the first port 1A as liquid to be filtered input, as the second port one C of concentrate output, as filtered fluid output the 3rd port one B and doubled as by the 3rd port one B or independent the 4th port one D as backwash liquor input arranged, first port 1A be connected with circulation stream 1 and with filter core 202 front end conducting, second port one C to be connected with circulation stream 1 by an operational mode switching control valve 3 and with filter core 202 rear end conducting, 3rd port one B and the 4th port one D and the closed cavity conducting formed between filter core 202 and shell 201.In the present embodiment, 4th port one D is doubled as by the 3rd port one B, at this moment, 3rd port one B also must connect recoiling device, and doubling as the 4th port one D(backwash liquor input) the 3rd port one B(filtered fluid output) the upper recoiling device that connects belongs to the state of the art, be no longer described in detail herein.In order to supply power to the liquid carrying in circulation stream 1, circulation stream 1 is also provided with pump 101, and in addition, circulation stream 1 also connects liquid supply device by liquid supplementation pipe 102, so that for system supplements liquid to be filtered, these technological means all belong to the common equipment in existing cross-flow filtration.
In order to improve the disposal ability of aforesaid liquid filter, as shown in Figure 1, this sedimeter includes at least one filter element 4, described filter element 4 comprises the material feeding box 401 that has conical structures, material feeding box 401 is provided with the feed pipe 402 be connected with the stream 1 that circulates, the top of material feeding box 401 is provided with multiple above-mentioned filter assemblies 2, first port 1A of these filter assemblies 2 be positioned at filter assemblies 2 lower end and with material feeding box 401 conducting respectively, second port one C is positioned at the upper end of filter assemblies 2 and the operational mode switching control valve 3 respectively by correspondence is parallel to circulation stream 1.In the present embodiment, sedimeter includes 2-3 the filter element 4 be parallel in circulation stream 1, each filter element 4 contains 6-8 filter assemblies 2, and be equipped with again in each filter assemblies 2 7-10 prop up filter core 202(specifically adopt common both ends open and within to enter to go out the chimney filter that form filters), thus form powerful filtration treatment ability.The filter assemblies 2 adopted in aforesaid liquid filter, both can be above this containing at least one (preferably multiple) common both ends open and within to enter to go out the filter assemblies of chimney filter that form filters, also can be the filter assemblies that the applicant of the application provides in the patent document of Chinese Patent Application No. 2013100371806 or 2009203185042.In addition, the feed pipe 402 in above-mentioned filter element is connected with this material feeding box 401 upper box body preferably by the mode tangent with the sidewall horizontal of material feeding box 401.
The course of work of this sedimeter is haply: liquid supplementation pipe 102 injects liquid to be filtered to circulation stream 1, liquid to be filtered enters feed pipe 402 under the promotion of pump 101, because feed pipe 402 is tangent with the sidewall horizontal of material feeding box 401, therefore, the liquid to be filtered entering material feeding box 401 will rotate (in Fig. 1, L1 is depicted as the rotational flow of liquid to be filtered) in material feeding box 401, at this moment, can promote the bulky grain sedimentation of carrying secretly in liquid to be filtered, the bulky grain making these heavier is effectively separated with liquid to be filtered, after this, liquid to be filtered enters in filter assemblies 2 by the first port 1A, then flow in the inner side cavity of filter core 202, if operational mode switching control valve 3 is closed, liquid to be filtered can only constantly gather in the inner side cavity of filter core 202, and the infiltration of liquid to be filtered is depicted as from inside to outside by the L2 in filter core 202(Fig. 1) and discharge filtered fluid from the 3rd port one B, i.e. the first filtered model (being equivalent to end-filtration), if operational mode switching control valve 3 is opened, then carry out the second filtered model (being equivalent to cross-flow filtration (in Fig. 1, L3 is depicted as the flowing of concentrate)), no matter be the first filtered model or the second filtered model, filter assemblies 2 all will periodically enter into backwash state, at this moment, backwash liquor is from doubling as the 4th port one D(backwash liquor input) the 3rd port one B(filtered fluid output) closed cavity (L4 Fig. 1 is depicted as the flowing of backwash liquor) that formed between inverse injection filter core 202 and shell 201, and then reverse recoil is carried out to filter core 202, after recoil state terminates, sedimeter gets back to filtration condition again.Visible, the filter assemblies 2 of sedimeter is in running, when liquid to be filtered from inside to outside by filter core 202 and from the 3rd port one B discharge filtered fluid time, filter assemblies 2 is in filtration condition, when backwash liquor enter the 4th port one D and ecto-entad by filter core 202 time, filter assemblies 2 is in backwash state, and the filtration condition of filter assemblies 2 and backwash period of state switch.
Below by embodiment, above sedimeter is further described.
Embodiment 1
As shown in Figure 2, be in the filtration condition of one-period at filter assemblies 2, first operational mode switching control valve 3 is in closed condition, namely filter assemblies 2 runs with the first filtered model, after the first filtered model runs a period of time, operational mode switching control valve 3 is opened, and filter assemblies 2 continues to run with the second filtered model.After this, filter assemblies 2 enters the backwash state of one-period, and under this backwash state, operational mode switching control valve 3 is opened all the time.Wherein, when the first filtered model switches to the second filtered model, operational mode switching control valve 3 can be triggered by the threshold values set and open, and this threshold values can be the time, but the filtration pressure difference of preferably filter core 202 both sides.The present embodiment preferably makes operational mode switching control valve 3 open when the filtration pressure difference of filter core 202 both sides reaches 0.2-0.4MPa, can better utilize this pressure reduction like this, in the moment that operational mode switching control valve 3 is opened, the liquid to be filtered be collected at inside filter core 202 in cavity is drained from the rear end of filter core 202 rapidly, at this moment, the shearing force that liquid to be filtered is formed on filter element filtering face is enough to take away a large amount of particle, is equivalent to carry out once cleaning to filter core 202, can extend filtration time.If startup optimization pattern switching control valve 3 switch filtration pressure difference be less than 0.2MPa, make device too early enter into the second filtered model, to lifting the rate of filtration and filter efficiency unfavorable; If the filtration pressure difference that startup optimization pattern switching control valve 3 switches is greater than 0.4MPa, the pollution grows worse of filter core 202, it is unfavorable probably to clean filter core 202.
Embodiment 2
As shown in Figure 3, be in the filtration condition of one-period at filter assemblies 2, first operational mode switching control valve 3 is in opening, namely filter assemblies 2 runs with the second filtered model, after the second filtered model runs a period of time, operational mode switching control valve 3 is closed, and filter assemblies 2 continues to run with the first filtered model.After this, filter assemblies 2 enters the backwash state of one-period, and under this backwash state, operational mode switching control valve 3 is opened all the time.
Embodiment 3
As shown in Figure 4, be in the filtration condition of one-period at filter assemblies 2, first operational mode switching control valve 3 is in closed condition, namely filter assemblies 2 runs with the first filtered model, and after the first filtered model runs a period of time, operational mode switching control valve 3 is opened, filter assemblies 2 continues to run with the second filtered model, after the second filtered model runs a period of time, operational mode switching control valve 3 is closed, and filter assemblies 2 continues to run with the first filtered model again.After this, filter assemblies 2 enters the backwash state of one-period, and under this backwash state, operational mode switching control valve 3 is opened all the time.Similar to Example 1, when the first filtered model switches to the second filtered model, be equivalent to carry out once cleaning to filter core 202, thus can filtration time be extended.
Embodiment 4
As shown in Figure 5, be in the filtration condition of one-period at filter assemblies 2, operational mode switching control valve 3 is in closed condition always, namely filter assemblies 2 runs with the first filtered model, after the first filtered model runs a period of time, filter assemblies 2 enters the backwash state of one-period, and under this backwash state, operational mode switching control valve 3 is opened all the time.
Above-described embodiment 1-4 all compares and is suitable for the lower liquid to be filtered system of solid content.
Claims (4)
1. be beneficial to the sedimeter of backwash, comprise the filter assemblies (2) be positioned on a circulation stream (1), this filter assemblies (2) comprise shell (201) and at least one both ends open being arranged in this shell (201) and within to enter to go out the filter core (202) that form filters, described shell (201) is provided with the first port (1A) as liquid to be filtered input, as second port (1C) of concentrate output, as filtered fluid output the 3rd port (1B) and doubled as by the 3rd port (1B) or independent the 4th port (1D) as backwash liquor input arranged, first port (1A) be connected with circulation stream (1) and with filter core (202) front end conducting, second port (1C) be connected with circulation stream (1) and with filter core (202) rear end conducting, 3rd port (1B) and the 4th port (1D) and the closed cavity conducting formed between filter core (202) and shell (201), in the running of this filter assemblies (2), when liquid to be filtered from inside to outside by filter core (202) and from the 3rd port (1B) discharge filtered fluid time, filter assemblies (2) is in filtration condition, when backwash liquor enters the 4th port (1D) and ecto-entad passes through filter core (202), filter assemblies (2) is in backwash state, the filtration condition of filter assemblies (2) and backwash period of state switch, it is characterized in that: described second port (1C) is connected by an operational mode switching control valve (3) with between circulation stream (1), be in the process of filtration condition at filter assemblies (2), this operational mode switching control valve (3) close all the time or at least partial period be close, and be in the process of backwash state at filter assemblies (2), this operational mode switching control valve (3) opens product, be in the process of filtration condition at filter assemblies (2), this operational mode switching control valve (3) at least once switches, thus makes conversion operation between first filtered model of filter assemblies (2) under operational mode switching control valve (3) is in closed condition and the second filtered model under operational mode switching control valve (3) is in opening, be in the filtration condition of one-period at filter assemblies (2), this operational mode switching control valve (3) is first in closed condition, filter assemblies (2) runs with the first filtered model, after the first filtered model runs a period of time, operational mode switching control valve (3) is triggered by the threshold values set and opens, and filter assemblies (2) continues to run with the second filtered model, when filter assemblies (2) runs with the first filtered model, when the filtration pressure difference of filter core (202) both sides reaches 0.2-0.4MPa, operational mode switching control valve (3) is opened, and filter assemblies (2) continues to run with the second filtered model.
2. sedimeter as claimed in claim 1, it is characterized in that: comprise at least one filter element (4), described filter element (4) comprises the material feeding box (401) that has conical structures, material feeding box (401) is provided with the feed pipe (402) be connected with the stream that circulates (1), the top of material feeding box (401) is provided with multiple described filter assemblies (2), first port (1A) of these filter assemblies (2) be positioned at filter assemblies (2) lower end and with material feeding box (401) conducting respectively, second port (1C) is positioned at the upper end of filter assemblies (2) and the operational mode switching control valve (3) respectively by correspondence is parallel to circulation stream (1).
3. sedimeter as claimed in claim 2, is characterized in that: described feed pipe (402) is connected with this material feeding box (401) upper box body by the mode tangent with the sidewall horizontal of material feeding box (401).
4. liquid filter method, use sedimeter, this sedimeter comprises the filter assemblies (2) be positioned on a circulation stream (1), this filter assemblies (2) comprise shell (201) and at least one both ends open being arranged in this shell (201) and within to enter to go out the filter core (202) that form filters, described shell (201) is provided with the first port (1A) as liquid to be filtered input, as second port (1C) of concentrate output, as filtered fluid output the 3rd port (1B) and doubled as by the 3rd port (1B) or independent the 4th port (1D) as backwash liquor input arranged, first port (1A) be connected with circulation stream (1) and with filter core (202) front end conducting, second port (1C) be connected with circulation stream (1) and with filter core (202) rear end conducting, 3rd port (1B) and the 4th port (1D) and the closed cavity conducting formed between filter core (202) and shell (201), in the running of this filter assemblies (2), when liquid to be filtered from inside to outside by filter core (202) and from the 3rd port (1B) discharge filtered fluid time, filter assemblies (2) is in filtration condition, when backwash liquor enters the 4th port (1D) and ecto-entad passes through filter core (202), filter assemblies (2) is in backwash state, the filtration condition of filter assemblies (2) and backwash period of state switch, it is characterized in that: described second port (1C) is connected by an operational mode switching control valve (3) with between circulation stream (1), be in the process of filtration condition at filter assemblies (2), this operational mode switching control valve (3) close all the time or at least partial period be close, and be in the process of backwash state at filter assemblies (2), this operational mode switching control valve (3) is opened, be in the process of filtration condition at filter assemblies (2), this operational mode switching control valve (3) at least once switches, thus makes conversion operation between first filtered model of filter assemblies (2) under operational mode switching control valve (3) is in closed condition and the second filtered model under operational mode switching control valve (3) is in opening, be in the filtration condition of one-period at filter assemblies (2), this operational mode switching control valve (3) is first in closed condition, filter assemblies (2) runs with the first filtered model, after the first filtered model runs a period of time, operational mode switching control valve (3) is triggered by the threshold values set and opens, and filter assemblies (2) continues to run with the second filtered model, when filter assemblies (2) runs with the first filtered model, when the filtration pressure difference of filter core (202) both sides reaches 0.2-0.4MPa, operational mode switching control valve (3) is opened, and filter assemblies (2) continues to run with the second filtered model.
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| US5792373A (en) * | 1996-05-31 | 1998-08-11 | Delaware Capital Formation, Inc. | Backwash filter system |
| US6177006B1 (en) * | 1998-03-30 | 2001-01-23 | Tadayoshi Nagaoka | Filtering device |
| CN100372782C (en) * | 2005-08-24 | 2008-03-05 | 南京工业大学 | Pretreatment method of ceramics membrane of reverse osmosis for desalting seawater |
| CN101721914A (en) * | 2009-12-21 | 2010-06-09 | 同济大学 | Hollow-fiber membrane module of additional electric field |
| CN201832474U (en) * | 2010-07-20 | 2011-05-18 | 高麟 | Cross flow filter |
| CN202161859U (en) * | 2011-04-11 | 2012-03-14 | 浙江四通环境工程有限公司 | Low-cost tubular filter |
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