CN109748412A - Sewage purification processing system - Google Patents

Abstract

Present invention relates particularly to a kind of sewage purification processing systems, Water Tank, the first filter assemblies, settling tank, the second filter assemblies and metal ion enrichment component including being sequentially connected in series connection by stainless steel pipeline, metal ion enrichment component includes cylinder, filler and outlet triple valve, filler fixation is filled in column body, filler is chitosan, and the top of cylinder also has cleaning interface；Outlet triple valve is connected to the bottom end of cylinder, the first open communication cylinder, and the second opening is treated water outlet, and third outlet is rinse liquid outlet.Solid particle polluter is retained using filter assemblies in sewage purification processing system of the invention, flocculant is added in settling tank and removes partial impurities, heavy metal ion is finally removed using suction type, three kinds of purification styles combine, excellent effect, and metal ion enrichment component is using chitosan as filler, adsorption effect is better than ion exchange resin, and be reversible adsorption, the recycling to heavy metal ion may be implemented, avoid secondary pollution.

Description

Sewage purification processing system

Technical field

The invention belongs to sewage treatment fields, and in particular to a kind of sewage purification processing system.

Background technique

In recent years, industrial rapid development brings high economic benefit, but the high cost of Industrial Wastewater Treatment is made It is discharged directly into river at a large amount of industrial wastewaters, to cause the pollution in river.Wherein, electrolysis, plating, pesticide, pigment, oil Contain a large amount of heavy metal ion in the industrial wastewaters such as paint, contained heavy metal ion is many kinds of, brings certain difficulty to processing. Heavy metal ion-containing waste water has the characteristics of the following aspects to the pollution of environment: 1. heavy metal contaminants are not in the natural environment It can be voluntarily decomposed into innocuous substance, and the change of form can only occur or shifted between different phases, during these Its toxicity does not obtain the elimination of essence, if disposition is slightly improper, heavy metal ion can be returned soluble in water, regenerates danger Evil is formed " secondary pollution "；2. organism absorbs heavy metal from environment, by the biological magnification of food chain, gradually Enrichment is got up in higher organism；3. after entering human body strong phase can occur with physiology polymer substance for heavy metal Interaction and be allowed to lose activity, it is also possible to accumulation causes slow poisoning in human body, and this accumulation property endanger sometimes for More than ten years just display.

Heavy metal has potential hazard because of its special chemistry, chemical property of the earth and poisonous effect referred to as in environment Important pollutant, have height harmfulness and refractory rationality.Therefore, to the purification of Heavy Metals in Waters ionic soil always with Come be domestic and foreign scholars research hot spot.Heavy metal in waste water it is main in the form of ions, such as Hg²⁺、Cd²⁺、Pb²⁺、 Cr⁶⁺Deng.The method of waste water of the processing containing heavy metal has very much, and traditional processing method mainly has chemical precipitation method, metal also Former method, absorption method, ion-exchange, electrolysis method and microbial method etc..Chemical precipitation method is easy and fast to a large amount of in removal water body Metal ion, but emission request is often not achieved in aqueous concentration, if generated sediment is dealt with improperly, will cause secondary dirt Dye.Inorganic heavy metal waste water of the electrolysis method suitable for processing high concentration, but the ion concentration of mercury in water cannot be fallen too low, And power consumption is big, and cost of investment is high.Though ion-exchange can from low concentration solution heavy-metal ion removal, the method by The influence of useless impurities in water and the limitation of exchanger kind, yield and cost etc. are larger.Metal deoxidization is suitable for being processed into Point single waste water, reaction rate is higher, can directly recycle heavy metal simple substance, but the reaction of this method is not exclusively, need and other Method is used in combination.

Although being continuously emerged at present for new method designed by the dirty water decontamination handles containing heavy metal ion, lack It is used for the cleaning equipment of sewage treatment less.In consideration of it, a kind of cleaning treatment system for the sewage containing heavy metal ion is designed, it is right It is all of great significance in environmental protection and social development.

Summary of the invention

In order to solve the problems, such as to lack the sewage disposal device of efficient removal heavy metal ions in sewage in the prior art, The present invention provides a kind of sewage purification processing systems.The technical problem to be solved in the present invention is achieved through the following technical solutions:

Sewage purification processing system, Water Tank, the first filter assemblies, sedimentation including being sequentially connected in series connection by stainless steel pipeline Tank, the second filter assemblies and metal ion are enriched with component, wherein the water inlet of the first filter assemblies is equipped with self priming pump, institute Self priming pump is stated for, into the first filter assemblies, filtered sewage to go out from the first filter assemblies by the sewage pump in Water Tank The mouth of a river flows into settling tank；

PH meter and feed opening are provided at the top of the settling tank, the water outlet of the settling tank is connected to the second mistake by force (forcing) pump Component is filtered, the sewage that force (forcing) pump is sent flows into the water inlet of metal ion enrichment component after the filtering of the second filter assemblies；

The metal ion enrichment component includes cylinder, filler and outlet triple valve, and filler fixation is filled in column body, described Filler is chitosan, and the top of the cylinder also has cleaning interface；

The outlet triple valve is connected to the bottom end of cylinder, exports the first open communication cylinder of triple valve, the second opening is net Change water out, third outlet is rinse liquid outlet.

Further, in sewage purification processing system of the present invention, also contain bacillus subtilis in the filler.

Further, in sewage purification processing system of the present invention, the sedimentation pot bottom is also equipped with machinery and stirs It mixes, reacting between sewage and flocculant is accelerated by stirring.

Further, in sewage purification processing system of the present invention, the bottom of the settling tank, which has, collects sludge Bucket, the sedimentation pot bottom is also connected with filter press, and sludge is pushed to the feed inlet of filter press by bucket, through filter press filters pressing Settling tank is discharged in mud cake afterwards.

Further, in sewage purification processing system of the present invention, first filter assemblies and the second filtering group Part structure is identical, includes level-one well strainer, second level leaf filter, three-level ultrafiltration membrane and adjustable supercharging pump, wherein one Grade well strainer uses stainless steel filter screen for core filtration members, and the rate of filtration is the m/h of 50 m/h~65, and retaining power is 10~15 kg/m³；It is 30 μm that second level leaf filter, which filters aperture of shutting off, and three-level ultrafiltration membrane is the UF ultrafiltration in 0.1 μm of aperture Film group；

The adjustable supercharging pump is arranged between level-one well strainer and second level leaf filter.

Further, in sewage purification processing system of the present invention, the second level leaf filter include upper plate body, Lower body and multiple groups hollow-fibre membrane tow, the both ends of the hollow-fibre membrane tow are encapsulated in plastic tubulature with resin glue, The plastic tubulature is inserted into the mounting hole on the upper plate body and lower body, so that hollow-fibre membrane tow is fixed on upper plate Between body and lower body；

It is equipped with filtered water inlet mouth in the center of the lower body, is equipped with filtering water outlet in the center of the upper plate body Mouthful；Liquid enters in second level leaf filter, through doughnut in the case where the pressure that adjustable supercharging pumps is pushed from filtered water inlet mouth The inner wall of film wire flows to the outside of film wire, is finally filtered out the mouth of a river and flows to three-level ultrafiltration membrane.

Beneficial effects of the present invention:

Solid particle polluter is retained using filtering in sewage purification processing system of the invention, flocculant is added in settling tank and removes Partial impurities finally remove heavy metal ion using suction type, and three kinds of purification styles combine, and clean-up effect is excellent, absorption Effect is better than conventional ion exchanger resin, and metal ion enrichment component is reversible adsorption, be may be implemented to heavy metal ion Recycling, avoids secondary pollution.

In sewage purification processing system of the invention metal ion enrichment component using chitosan as filler, chemisorption Adsorbent selects chitosan (chitosan), and chitosan is also known as chitosan, is the chitin being widely present by nature What matter (chitin) was obtained by deacetylation, material source is extensive, price economy, and chitosan has very strong adsorption energy Power, can adsorbing metal ions, chitosan main function be coordination, secondly be electrostatic interaction, coordination is on amino Electronics generate in the unoccupied orbital of metal ion to being filled into, electrostatic interaction be negative electrical charge on hydroxyl and metal ion just Charge is attracted each other and is generated, and wherein amino is the optimum activity site in conjunction with metal ion, has stabilization to metal ion Coordination, the size of adsorption capacity depends on its deacetylation, and deacetylation is bigger, and adsorption capacity is stronger.

Microorganism adsorption can also be cooperated, microorganism adsorption selects bacillus subtilis, and is produced from the surface of bacillus subtilis Endophytic bacteria cellulose, bacteria cellulose are that had as D-Glucose with chain polysaccharide polymer made of β-Isosorbide-5-Nitrae glucosides key connection Ultrapure, ultra-fine, superpower and moisture holding capacity is strong, will not generate secondary pollution, large specific surface area, porous and there are great amount of hydroxy group etc. solely Special property, wherein hydroxyl is the group in conjunction with metal ion, and bacteria cellulose compares table as novel Bio-Nano-Materials Area is high, and adsorption effect is good.

The filler that chitosan and bacillus subtilis combination are constituted such as to contents of many kinds of heavy metal ion, imitate by the absorption of lead, cadmium, mercury Fruit is excellent, and chitosan and bacillus subtilis act synergistically in adsorption process, and chitosan is incorporated in the surface of bacillus subtilis, Thick weaker zone is formd, metal ion can be freely accessible to, and be chelated；The surface area ratio of bacillus subtilis compared with Greatly, the stretching, extension for enabling chitosan more dispersed, more binding sites can be exposed, and substantially increase chitosan to a huge sum of money Belong to the adsorption capacity of ion.

Filter assemblies in sewage purification processing system of the invention include level-one well strainer, second level leaf filter With three-level ultrafiltration membrane, wherein level-one well strainer is mainly used for tentatively removing the suspended matter and solid particle in sewage, second level Leaf filter mainly removes partial size in 50 microns of solid particle, colloid, macromolecular substances, bacterium and three-level ultrafiltration membranes below It is mainly used for removing substance of the partial size at 0.1 micron or more；If large granular impurity is directly entered second level leaf filter and three Grade ultrafiltration membrane, it is easy to cause hollow fiber film thread fracture or the rupture of ultrafiltration membrane, also be easy to cause second level leaf filter Be more than load with three-level ultrafiltration membrane and block, to reduce filtration, purification effect, the three-stage filtration of this system to impurity step by step Filtering, it can enhancing clean effect, it is often more important that can protect ultrafiltration module and be not damaged.

The present invention is described in further details below with reference to accompanying drawings and embodiments.

Detailed description of the invention

Fig. 1 is sewage purification processing system structural schematic diagram.

Fig. 2 is metal ion enrichment component structure diagram.

Fig. 3 is the first filter assemblies structural schematic diagram in sewage purification processing system.

Fig. 4 is the structural schematic diagram of second level leaf filter in sewage purification processing system.

In figure: 1- Water Tank, the first filter assemblies of 2-, 3- settling tank, the second filter assemblies of 4-, 5- metal ion enrichment group Part, 6- self priming pump, 7-pH meter, the outlet 8- feed opening, 9- force (forcing) pump, 10- cylinder, 11- filler, 12- triple valve, 13- cleaning connect Mouth, the opening of 14- first, the opening of 15- second, the outlet of 16- third, 17- mechanical stirring, 18- filter press, the filtering of 19- level-one net formula Device, 20- second level leaf filter, 21- three-level ultrafiltration membrane, 22- adjustable supercharging pump, 23- upper plate body, 24- lower body, 25- are hollow Tunica fibrosa tow, 26- filtered water inlet mouth, 27- filter water outlet.

Specific embodiment

Reach the technical means and efficacy that predetermined purpose is taken for the present invention is further explained, below in conjunction with attached drawing and reality Example is applied to a specific embodiment of the invention, structure feature and its effect, detailed description are as follows.

In the description of the present invention, it is to be understood that, term " longitudinal direction ", " length ", "front", "rear", "left", "right", The orientation or positional relationship of the instructions such as "top", "bottom", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only For the convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning must have specific side Position is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is at least two, such as two It is a, three etc., unless otherwise specifically defined.

In the present invention unless specifically defined or limited otherwise, term " installation ", " setting ", " connected ", " connection ", Terms such as " fixations " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can To be mechanical connection, it is also possible to be electrically connected or can communicate with each other；It can be directly connected, it can also be by between intermediary It connects connected, can be the connection inside two elements or the interaction relationship of two elements.For the ordinary skill of this field For personnel, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower" It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above " Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of First feature horizontal height is less than second feature.

Chitosan (deacetylation > 90%) used below is purchased from Biotechnology Co., Ltd, Huaxing；Bacillus subtilis by Chinese Typical Representative biology saves center and provides；After growing to stationary phase in LB culture medium, centrifuge washing removes culture medium and metabolism Product is resuspended in water stand-by.

Embodiment 1:

In order to solve the problems, such as to lack the sewage disposal device of efficient removal heavy metal ions in sewage, this hair in the prior art It is bright to provide a kind of sewage purification processing system as shown in Figure 1, the sewage including being sequentially connected in series connection by stainless steel pipeline Tank 1, the first filter assemblies 2, settling tank 3, the second filter assemblies 4 and metal ion are enriched with component 5, wherein the first filter assemblies 2 Water inlet self priming pump 6 is installed, self priming pump 6 is used for the filtering by the sewage pump in Water Tank 1 into the first filter assemblies 2 Sewage afterwards flows into settling tank 3 from the water outlet of the first filter assemblies 2.

As described in Figure 3, the first filter assemblies 2 are identical with 4 structure of the second filter assemblies, include level-one well strainer 19, second level leaf filter 20, three-level ultrafiltration membrane 21 and adjustable supercharging pump 22, wherein level-one well strainer 19 is using stainless Steel filter screen is core filtration members, and the rate of filtration is the m/h of 50 m/h~65, and retaining power is 10~15 kg/m³；Second level is board-like It is 30 μm that filter 20, which filters aperture of shutting off, and three-level ultrafiltration membrane 21 is the UF ultrafiltration membrane group in 0.1 μm of aperture；Adjustable supercharging pump 22 It is arranged between level-one well strainer 19 and second level leaf filter 20.

As shown in figure 4, second level leaf filter 20 includes upper plate body 23, lower body 24 and multiple groups hollow-fibre membrane tow 25, the both ends of hollow-fibre membrane tow 25 are encapsulated in plastic tubulature with resin glue, and plastic tubulature is inserted into upper plate body 23 and lower plate In mounting hole on body 24, so that hollow-fibre membrane tow 25 is fixed between upper plate body 23 and lower body 24；In lower body 24 center is equipped with filtered water inlet mouth 26, is equipped with filtering water outlet 27 in the center of upper plate body 23；Liquid is adjustable Under the pressure of booster pump 22 pushes, enter in second level leaf filter 20 from filtered water inlet mouth 26, through hollow fiber film thread Inner wall flows to the outside of film wire, is finally filtered out the mouth of a river 27 and flows to three-level ultrafiltration membrane 21.

PH meter 7 and feed opening 8 are provided at the top of settling tank 3,3 bottom of settling tank is also equipped with mechanical stirring 17, by stirring It mixes and accelerates reacting between sewage and flocculant.The bottom of settling tank 3 has the bucket for collecting sludge, and 3 bottom of settling tank also connects Filter press 18 is connect, sludge is pushed to the feed inlet of filter press 18 by bucket, and settling tank is discharged in the mud cake after 18 filters pressing of filter press 3。

The water outlet of settling tank 3 is connected to the second filter assemblies 4 by force (forcing) pump 9, and the sewage that force (forcing) pump 9 is sent is through second Filter assemblies 4 flow into the water inlet of metal ion enrichment component 5 after filtering.As shown in Fig. 2, metal ion enrichment component 5 includes Cylinder 10, filler 11 and outlet triple valve 12, the fixation of filler 11 are filled in inside cylinder 10, and filler 11 is that chitosan or this shell are poly- The mixture of sugar and bacillus subtilis.Chitosan is also known as chitosan, be widely present by nature chitin ( Chitin it) being obtained by deacetylation, material source is extensive, price economy, and chitosan has very strong adsorption capacity, Can adsorbing metal ions, chitosan main function be coordination, secondly be electrostatic interaction, coordination is the electricity on amino Son is generated in the unoccupied orbital of metal ion to being filled into, and electrostatic interaction is the positive charge of the negative electrical charge and metal ion on hydroxyl It attracts each other and generates, wherein amino is the optimum activity site in conjunction with metal ion, has stable match to metal ion The size of position effect, adsorption capacity depends on its deacetylation, and deacetylation is bigger, and adsorption capacity is stronger.

Such as to contents of many kinds of heavy metal ion, lead, cadmium, mercury synergistic sorption, shell is poly- for chitosan and bacillus subtilis composite filling Sugar combines on the surface of bacillus subtilis, forms thick weaker zone, metal ion can be freely accessible to, and chela occurs It closes；The surface area ratio of bacillus subtilis is larger, enables the stretching, extension that chitosan is more dispersed, and more binding sites can expose Out, chitosan is substantially increased to the adsorption capacity of heavy metal ion, and the heavy metal ion in sewage is thoroughly removed.Often 0.2g chitosan is added about 6, and the diameter height of 000,000 bacillus subtilis, cylinder compares for 1:5 ~ 1:8.It is 1 in the present embodiment: 5, adsorption effect is preferable.

Also there is cleaning interface 13 to be returned the heavy metal ion of absorption for being passed through eluant, eluent on the top of cylinder 10 Receive and realize simultaneously the regeneration of adsorption stuffing.

Outlet triple valve 12 is connected to the bottom end of cylinder 10, and 14 connection cylinder 10 of the first opening, the second opening 15 is net Change water out, third outlet 16 is rinse liquid outlet.

The course of work of this sewage purification processing system is as follows:

1, the sewage being stored in Water Tank is pumped by self priming pump into the first filter assemblies, and filter assemblies include level-one net formula Filter, second level leaf filter and three-level ultrafiltration membrane, level-one well strainer are mainly used for tentatively removing the suspension in sewage Object and solid particle, the hollow-fibre membrane tow of second level leaf filter mainly remove partial size in 50 microns of solids below Grain, colloid, macromolecular substances, bacterium, three-level ultrafiltration membrane are mainly used for removing substance of the partial size at 0.1 micron or more；Bulky grain If impurity is directly entered second level leaf filter and three-level ultrafiltration membrane, it is easy to cause hollow fiber film thread fracture or ultrafiltration The rupture of film also be easy to cause second level leaf filter and three-level ultrafiltration membrane to be more than load and block, to reduce filtration, purification Effect.

2, the sewage after primary filtration enters settling tank, passes through the pH feelings of the detectable sewage out of the pH meter on settling tank Condition first can be added alkali or acid by feed opening, adjust pH, suitable flocculant is then added if peracid or excessively alkali, as molysite is wadded a quilt with cotton Solidifying agent (ferrous sulfate), effectively removes COD of sewage and BOD.Mechanical stirring can be opened by opening during charging, and quickening was flocculated Journey, after a certain period of time, flocky precipitate sink to the bucket of sedimentation pot bottom, and sludge is pushed to the feed inlet of filter press by bucket, Settling tank is discharged in mud cake after filter press filters pressing.

3, it is miscellaneous to be filtered to remove solid particle by the second filter assemblies under the action of force (forcing) pump for sewage after settlement Matter, filtered sewage flow into the water inlet of metal ion enrichment component.Sewage flows through metal ion enrichment component from top to bottom, When flowing through filler, chitosan and bacillus subtilis composite filling to contents of many kinds of heavy metal ion such as, lead, cadmium, mercury synergistic sorption, shell Glycan is incorporated in the surface of bacillus subtilis, forms thick weaker zone, metal ion can be freely accessible to, and chela occurs It closes；The surface area ratio of bacillus subtilis is larger, enables the stretching, extension that chitosan is more dispersed, and more binding sites can expose Out, chitosan is substantially increased to the adsorption capacity of heavy metal ion, and the heavy metal ion in sewage is thoroughly removed.

4, purified sewage flows out cleaning treatment system, eluant, eluent can be added with self-cleaning interface at this time, will be adsorbed on Heavy metal ion in filler elutes recycling, and reaches the regeneration of filler, convenient for recycling.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention Protection scope.

Claims (6)

1. sewage purification processing system, which is characterized in that including be sequentially connected in series by stainless steel pipeline connection Water Tank (1), First filter assemblies (2), settling tank (3), the second filter assemblies (4) and metal ion enrichment component (5), wherein the first filtering The water inlet of component (2) is equipped with self priming pump (6), and the self priming pump (6) is used for the sewage pump in Water Tank (1) to first In filter assemblies (2), filtered sewage flows into settling tank (3) from the water outlet of the first filter assemblies (2)；

It is provided with pH meter (7) and feed opening (8) at the top of the settling tank (3), the water outlet of the settling tank (3) passes through pressurization Pump (9) connection the second filter assemblies (4), the sewage that force (forcing) pump (9) is sent through the second filter assemblies (4) filter after flow into metal from The water inlet of son enrichment component (5)；

Metal ion enrichment component (5) includes cylinder (10), filler (11) and outlet triple valve (12), and filler (11) is fixed It is internal to be filled in cylinder (10), the filler (11) is chitosan, and the top of the cylinder (10) also has cleaning interface (13)；

Outlet triple valve (12) is connected to the bottom end of cylinder (10), and the first opening (14) of outlet triple valve (12) is connected to column Body (10), the second opening (15) are treated water outlet, and it is rinse liquid outlet that third, which exports (16),.

2. sewage purification processing system according to claim 1, which is characterized in that also contain withered grass in the filler (11) Bacillus.

3. sewage purification processing system according to claim 1, which is characterized in that also install settling tank (3) bottom There are mechanical stirring (17), reacting between sewage and flocculant is accelerated by stirring.

4. sewage purification processing system according to claim 1, which is characterized in that the bottom of the settling tank (3) has The bucket of sludge is collected, settling tank (3) bottom is also connected with filter press (18), and sludge is pushed to filter press (18) by bucket Settling tank (3) are discharged in feed inlet, the mud cake after filter press (18) filters pressing.

5. purification of paper-making effluent processing system according to claim 1, which is characterized in that first filter assemblies (2) It is identical with the second filter assemblies (4) structure, it is super including level-one well strainer (19), second level leaf filter (20), three-level Filter membrane (21) and adjustable supercharging pump (22), wherein level-one well strainer (19) uses stainless steel filter screen for core filtration members, The rate of filtration is the m/h of 50 m/h~65, and retaining power is 10~15 kg/m³；Second level leaf filter (20) filters cutoff hole Diameter is 30 μm, and three-level ultrafiltration membrane (21) is the UF ultrafiltration membrane group in 0.1 μm of aperture；

The adjustable supercharging pump (22) is arranged between level-one well strainer (19) and second level leaf filter (20).

6. purification of paper-making effluent processing system according to claim 5, which is characterized in that the second level leaf filter It (20) include upper plate body (23), lower body (24) and multiple groups hollow-fibre membrane tow (25), the hollow-fibre membrane tow (25) Both ends be encapsulated in plastic tubulature with resin glue, the plastic tubulature is inserted on the upper plate body (23) and lower body (24) In mounting hole, so that hollow-fibre membrane tow (25) is fixed between upper plate body (23) and lower body (24)；

Filtered water inlet mouth (26) are equipped in the center of the lower body (24), are installed in the centre bit of the upper plate body (23) There are filtering water outlet (27)；Liquid enters two steps in the case where the pressure of adjustable supercharging pump (22) pushes, from filtered water inlet mouth (26) In formula filter (20), the outside of film wire is flowed to through the inner wall of hollow fiber film thread, is finally filtered out the mouth of a river (27) flow direction Three-level ultrafiltration membrane (21).