CN102224111A

CN102224111A - Water purification device

Info

Publication number: CN102224111A
Application number: CN2009801465978A
Authority: CN
Inventors: J.查特杰; S.K.古普塔; R.拉马钱德兰
Original assignee: Unilever NV
Current assignee: Unilever NV
Priority date: 2008-09-23
Filing date: 2009-09-21
Publication date: 2011-10-19
Also published as: EP2331470A1; UA104007C2; AR073662A1; EA201100520A1; EA018941B1; ZA201102042B; BRPI0918963A2; MX2011003140A; WO2010034687A1

Abstract

The present invention relates to a gravity fed water purification device comprising a biocide unit, a reservoir separated by a wall fromand positioned adjacently to a scavenger comprising a media capable of scavenging said biocide or byproducts thereof from water and a dispensing chamber interconnected to define a flow path where the biocide is added by the biocide unit to the waterin the reservoir which flows over the wall into the scavenger and through an outlet to the dispensing chamber, and, the outlet is positioned such that at least 10% by weight of said media is below the lowest level of the outlet, and the wall extends abovethe highest level of the media and above the lowest level of the outlet.

Description

Purifier

Technical field

The present invention relates to gravity-fed purifier.

Background technology

Known in the prior art gravity-fed purifier.WO2004000732(Unilever) a kind of gravity-fed purifier is disclosed, it comprises the filtration unit that is suitable for filtering particulate material, the sterilant unit that comprises sterilant, wherein sterilant be contained in the sealing chamber and with the filtration unit fluid connection, the water that makes filtration unit handle is supplied in the sterilant unit by gravity then, and remains on one of them predetermined period, after this, via the clearing apparatus of the sterilant that is suitable for recovering to leach, water is discharged this system.This device comprises clean unit, and this water purification unit comprises again by isolating top chamber of partition member and floor chamber, and filtering unit is fixed on the partition member and is contained in the top chamber, and chemical purification unit is contained in the floor chamber.In use, water injects top chamber, and does not have particulate material substantially, and the water after the purification of chemical scavengers and microorganism flows in the distribution chamber to be used for use.

ZA9503286(Recovery Engineering, 1996) a kind of cleaner that is used for water and other similar liquids is disclosed, it comprises import, disinfection unit, waiting room, processing unit and outlet.This waiting room has minimum volume, and it is flow rate of liquid and is to be suppressed at the function that bacterium in the liquid, virus and other pollutents activate the necessary scheduled time.This cleaner also is designed near plug flow situation place flowing fluid, makes first part's guiding liquids stream of the liquid that enters cleaner, and can be with before it or entered the liquid short circuit of cleaner afterwards or mix a little.

Disadvantage of the gravity-fed purifier of prior art is, high relatively sterilant consumption in the water of swabbing pig upstream is not especially when this device have to use the period of growing relatively.Guarantee to be in a method of the enough concentration of sterilant of swabbing pig device upstream, design a kind of sterilant unit in water, to increase the sterilant of higher amount, in the case, the swabbing pig device need remove the sterilant of higher amount, this or reduced swabbing pig work-ing life, perhaps in the water in swabbing pig downstream, cause the sterilant of higher amount or its byproduct.

Another disadvantage of gravity-fed purifier of prior art is, low relatively removing effect can cause high relatively sterilant in swabbing pig device downstream or its byproduct concentration, this be do not expect and can change the taste and/or the smell of purifying waste water.The work-ing life of swabbing pig device is still few relatively, forces the frequent replacing of swabbing pig device, and this can cause the increase of microbial contamination risk.

Another disadvantage of gravity-fed purifier of prior art is, the possibility of distribution chamber microbial contamination, especially operator or user to swabbing pig between the stage of replacement.In case being caused by bacterium, the surface in distribution chamber or swabbing pig device downstream pollutes or at swabbing pig when sewage overflows into distribution chamber between the stage of replacement, the water in distribution chamber keeps by bacterial contamination, does not have sterilant substantially because arrive the water of distribution chamber.By adopting sterilizing agent such as hypochlorite solutions, the downstream surface of distribution chamber and swabbing pig device is cleaned, if when perhaps the operator uses the sterilization gloves, the problem of microbial contamination obtains reducing.Yet the user of operator on the scene or replacing swabbing pig device does not train through sufficient, and/or does not use sterilizing agent or sterile gloves, and this can cause the performance dissatisfactory of the device after the replacing of swabbing pig device.

One object of the present invention is to overcome or improve at least one disadvantage of prior art, perhaps provides the alternative of usefulness.

One object of the present invention is to provide a kind of gravity-fed treating plant, and it has the swabbing pig of relative long life and/or makes the reduction of in the water in swabbing pig downstream sterilant or its byproduct concentration.

Summary of the invention

According to the present invention, a kind of gravity-fed purifier is provided, it comprises sterilant unit, holder, and it separates by the adjacent swabbing pig in wall and position, and this swabbing pig comprises the medium that can remove described sterilant or its byproduct from water, distribution chamber with interconnection, to limit flow passage, wherein sterilant adds to by the sterilant unit in the water of holder, and water flows through wall and enters in the swabbing pig, and by export in the distribution chamber and

A. be provided with the outlet make described medium at least 10% the minimum level that weighs less than outlet and

B. wall is extending on the highest level of medium and on the minimum level of outlet.

Description of drawings

Fig. 1 is first embodiment of gravity-fed purifier.

Fig. 2 is second embodiment of gravity-fed purifier.

Fig. 3 is before the dismounting swabbing pig, the gravity-fed purifier of second embodiment.

Fig. 4 is after the dismounting swabbing pig, the gravity-fed purifier of second embodiment.

Embodiment

This swabbing pig comprises the medium that can remove sterilant or its byproduct from water.This medium can be by reaction or by the adsorption removal sterilant; Preferred this medium is an adsorbent medium.Preferably, this adsorbent medium is a carbon.Preferred, this adsorbent medium is an activated carbon.Activated carbon is preferably selected from bituminous coal, Exocarpium cocois (Cocos nucifera L), timber and petroleum tar one or more.The surface-area of activated carbon preferably surpasses 500 m ²/ g; More preferably surpass 1000 m ²/ g.Preferably, activated carbon has the size evenness coefficient less than 2, is more preferably less than 1.5.Preferred activated carbon has tetracol phenixin (CCl4) and outnumbers 50%, more preferably surpasses 60%.Preferably, activated carbon has the iodine number greater than 800, more preferably greater than 1000.Preferably, activated carbon adopts particulate state or Powdered.Preferred, adopt solid blocky activated carbon.Solid blocky activated carbon adopts technology well known in the prior art to make by using pottery or non-ceramic binder.Making the tackiness agent of carbon piece and the technology of manufacturing piece is known for those skilled in the art, for example, from WO0703019(Unilever), WO0703382(Unilever), WO07003259(Unilever), WO06069712(Unilever) and WO05095284(Unilever), they are bonded to this by reference.The preferred polymeric tackiness agent.Particularly preferred tackiness agent comprises the polyethylene of High molecular weight polyethylene, high molecular weight polypropylene, ultra high molecular weight, the polypropylene of ultra high molecular weight.

Outlet is set makes the minimum level that weighs less than outlet of medium at least 10%.Preferably, the minimum level that weighs less than outlet of medium at least 75%.Preferred, all basically media are lower than the minimum level of outlet.

Preferably, outlet is included in swabbing pig and the isolating partition member of distribution chamber, and swabbing pig is detachably connected on the partition member, makes swabbing pig to be changed and not contacted with the device inside of outlet downstream part by the people.Preferably, swabbing pig is detachably connected on the remaining part of this device.Partition member is positioned at the downstream of swabbing pig and the upstream of distribution chamber.Partition member preferably includes the well shape recess that holds swabbing pig.This partition member preferably includes the open tube projection of extending towards swabbing pig.Outlet preferably is contained on the open tube projection, and is arranged so that at least 10% of medium-weight is lower than the minimum level of outlet.

Preferably, the form of one or more openings in partition member is adopted in outlet, is communicated with to allow the fluid between swabbing pig and distribution chamber.

Preferably, the shape of outlet and/or size configurations make, when swabbing pig when partition member is dismantled, staff can not contact with the internal surface of distribution chamber.By selecting cross-sectional area preferably less than 5cm ², be more preferably less than 3cm ²Most preferably less than 2cm ², might prevent that staff from contacting the possibility of internal surface.Also may construct the one or more elongated open of being shaped as of outlet, it has preferred width less than 1cm, is more preferably less than 0.5cm.

This device comprises the holder of setting adjacent one another are and the isolating wall of swabbing pig.Therefore, holder is arranged on a side of this wall and the opposite side that swabbing pig is arranged on wall.Wall is extending on the highest level of medium and on the minimum level of outlet.Preferably, this wall is put extension on swabbing pig.The end face of wall is preferably smooth, makes the wall height can not change substantially along the width of wall.This wall is preferably vertical.This wall can be a collinear, zigzag or crooked.This wall is preferably columnar.

The volume of device that is used for keeping in the downstream of the upstream of swabbing pig and wall water is more preferably less than 20% preferably less than 30% of reservoir volume, and most preferably less than 10%.

The sterilant unit is suitable for adding sterilant in the water in holder.This sterilant exists with liquid or solid form.Preferably, the sterilant unit comprises the sterilant that is contained in the sealing chamber, and is suitable for making sterilant to contact with water, makes sterilant add in the water.This sterilant can be solid or liquid.Sterilant is preferably the halogen of dissolving or ionic species.Sterilant can be the solvable halogen compounds or the halogenation ion exchange resin that can discharge the ionic halogen.Chlorine and iodine are that preferred sterilant and chlorine are particularly preferred sterilant.The muriate that can be used as sterilant comprises the alkaline earth salt of basic metal or hypochlorite, perhaps DICHLOROISOCYANURIC ACID or trichloroisocyanuric acid.When sterilant uses with solid-state form, thereby sterilant preferably is suitable for contacting the cylindrical tablet that the water sterilant is dissolved in the water with set rate or the form of a plurality of tablets.Preferred biocide tablets material and sterilant unit structure are at WO05095284(Unilever) in description, the document is combined in this by reference.Preferably, the sterilant unit comprises the sterilant that is contained in the sealing chamber, and is suitable for making sterilant to contact with water, makes sterilant be added in the water.

After having added sterilant, water preferably remains on one predetermined period in the holder.This can realize by any suitable means or apparatus structure.It is preferred that to keep water be known in the means of holder predetermined period or residence time in the prior art, for example, W02004000732(Unilever) and WO05095284(Unilever), these documents are combined in this by reference.

Preferably, this device comprises top chamber, and it is suitable for receiving water to be clean and is positioned at the upstream of holder and fluid connection with it.

Preferably, this device comprises filtration unit, and it is suitable for filtering particulate material, and is positioned at the upstream of holder and fluid connection with it.Preferred, filtration unit is between top chamber and holder and define water wherein and flow into flow passage the holder from top chamber by filtration unit.More preferably the sterilant unit by filtration unit, then by the sterilant unit, flows into the flow passage in the holder between filtration unit and holder and defined wherein water from top chamber.

Preferably, distribution chamber provides and distributes the distribution device of purifying waste water.Preferably, distribution device is a tap.

Description of drawings

Referring now to Fig. 1,, gravity-fed purifier (G) comprise have sterilant (B) sterilant unit (BU), holder (R), this holder by wall (W) with adjacent swabbing pig (S) be set separate, this swabbing pig comprises the medium (M) that can remove sterilant or its byproduct from water, distribution chamber (D) with interconnection with the qualification flow passage, wherein sterilant adds in the water in the holder (R) by sterilant unit (BU), this water flows through wall (W) and arrives swabbing pig (S), arrives distribution chamber (D) by outlet (O).Outlet (O) is arranged so that about 15% of medium (M) weight is lower than the minimum level of outlet (O), and wall (W) is extending on the highest level of medium (M) and on the minimum level of outlet (O).Outlet (O) is included in the partition member (P), and this partition member separates swabbing pig (S) and distribution chamber (D).

During use, holder (R) is full of water from the top.(BU) adds sterilant in the water of holder (R) to by the sterilant unit.When the water level of holder is higher than wall (W), water flows through wall (W) from holder (R) and flows to the swabbing pig (S), water is by medium (M) in swabbing pig, and this medium is removed sterilant and its byproduct from water, and water flows in the distribution chamber (D) by outlet (O) then.When the water level in the holder (R) descends and reaches the top of wall (W), mobile stopping from holder (R) to swabbing pig (S), this water that will isolate holder (R) contacts with medium (M), and water continues to flow through the minimum level of outlet (O) up to its arrival outlet (O) from swabbing pig (S) under gravity simultaneously.The location of the lowest water level of outlet (O) has guaranteed that the medium (M) of at least 10% weight remains submerged in the water, and up to when flow circuit repeats, fresh water adds in the holder (R) once more.This device (G) is with the batch mode operation, and wherein the flow circuit heel in one period does not flow during plateau with arranged plateau.It should be understood that, the feature combination of the location of outlet (O) and the height of wall (W), the minimizing of permission sterilant or its byproduct quantity the water that is discharged to distribution chamber (D) from swabbing pig (S), and can be during plateau, cause that sterilant consumes significantly in holder (R).When swabbing pig from partition member (P) when separating, the combination of above-mentioned feature will advantageously reduce from the seepage of holder (R) or the water from swabbing pig (S) to distribution chamber (D), thereby, reduce because the possibility of the pollution distribution chamber (D) that the seepage of water produces, because when with swabbing pig (S) and partition member (P) when separating, water might contact with the people.

Referring now to Fig. 2,, gravity-fed purifier (G) comprises top chamber (TC), filtration unit (F), sterilant unit (BU), holder (R), this holder by wall (W) with adjacent swabbing pig (S) be set separate, this swabbing pig comprises the medium (M) that can remove sterilant or its byproduct from water, with with the interconnection of this swabbing pig and limit the distribution chamber (D) of the flow passage of representing by dotted arrow, wherein water from top chamber (TC) flow out and by filtration unit (F) to being suitable for adding the sterilant unit (BU) of sterilant (B) to the water, water flows in the holder (R) by outfall sewer (DO), and cross wall (W) in swabbing pig (S), and in distribution chamber (D), the user can obtain from distribution chamber by tap (T) and purify waste water by outlet (O).Filtration unit (F) is suitable for filtering particulate material and top chamber (TC) is suitable for receiving water to be clean.Sterilant unit (BU) comprises the tablet of the sodium trichlorine isocyanuric acid sterilant (B) that is contained in the sealing chamber and is suitable for making this tablet to contact with water, makes sodium trichlorine isocyanuric acid add in the water.Being provided with of outfall sewer (DO) allows water to be sent to swabbing pig (S) before at it, remains on holder (R) preset time.Swabbing pig (S) comprises annular blocky activated carbon media (M), and it is connected to base plate (BP) at two ends.This partition member (P) separates swabbing pig (S) and distribution chamber (D).Partition member (P) comprises columniform well shape recess and is positioned at hollow tubular projection (TU) recess central authorities, that extend vertically upward, and it defines housing, and annular swabbing pig (S) is placed on wherein.Hollow tube (TU) is provided with external screw-thread near its top, itself and the corresponding thread fit of fastening cover (FC), thus make swabbing pig be detachably connected on this partition member.Outlet (O) is positioned on the hollow tube (TU), makes all substantially media (M) be lower than the minimum level of outlet.Columned wall (W) is extending on the highest level of medium (M) and is exporting on the minimum level of (O).

During use, top chamber (TC) is full of water from above.Water flows through filtration unit (F), and particle is removed therein, and by sterilant unit (BU), sterilant (B) adds in the water therein, arrives in the holder (R) by outfall sewer (DO) then.When the water level of holder is higher than wall (W), water is crossed wall (W) from holder (R) and is flow to the swabbing pig (S), wherein water is radially passing through medium (M) on the inward direction, removes sterilant and its byproduct from water, and water is by in outlet (O) the inflow distribution chamber (D) then.When the water level in the holder (R) descends and reaches the top of wall (W), mobile stopping from holder (R) to swabbing pig (S), this water that will isolate holder (R) contacts with medium (M), water continues to flow through outlet (O) from swabbing pig (S) under gravity simultaneously, arrives the minimum level of outlet (O) up to it.The location of the lowest water level of outlet (O) has guaranteed that all substantially media (M) keep being submerged in the water, and through when flow circuit repeats, fresh water adds in the top chamber (TC) once more, flows to then in the holder (R).This device (G) is with the batch mode operation, and wherein the flow circuit heel in one period does not flow during plateau with arranged plateau.It should be understood that, the feature combination of the location of outlet (O) and the height of wall (W), the minimizing of permission sterilant or its byproduct quantity the water that is discharged to distribution chamber (D) from swabbing pig (S), and can be during plateau, cause that sterilant consumes significantly in holder (R).

Referring now to Fig. 3,, it has described a device, and wherein top chamber (TC), sterilant unit (BU) and filtration unit (F) separate with holder (R), is convenient to its replacing to allow the user to obtain swabbing pig.Fastening cover (FC) is outwarded winding from hollow tube (TU), and swabbing pig shifts out to change.Might change swabbing pig, and need not change such as filtration unit or unitary other assembly of sterilant, therefore provide handiness to make swabbing pig have the long relatively life-span, compared with other assemblies of this device, swabbing pig needs the still less replacing of frequency relatively.

Referring now to Fig. 4,, it has described the device after swabbing pig has shifted out.Partition member (P) utilizes shade line to illustrate.Partition member (P) comprises columniform well shape recess and is positioned at open tube (TU) recess central authorities, that extend vertically upward, defines annular swabbing pig (S) and is placed on wherein housing.

It should be understood that the people can dismantle swabbing pig (S) individually with to its replacing, and can contact, thereby remarkable minimizing is in swabbing pig (S) contamination of heavy when dismantling with this device in outlet (O) downstream is inner.The feature of the position of the height of wall (W) and outlet (O) will be at swabbing pig from partition member (P) when dismantling, further advantageously reduce from the seepage of holder (R) or water from swabbing pig (S) to distribution chamber (D), thereby reduce because the possibility of the pollution distribution chamber (D) that the seepage of water produces, when with swabbing pig (S) and partition member (P) when separating, water might be polluted by the people.

The opportunities for contamination that reduces swabbing pig (S) downstream water significantly is a particularly important, water at downstream part does not have sterilant substantially, and in case pollute, under the situation of distribution chamber (D) and swabbing pig (S) downstream surface of not sterilizing fully, this water can not be cleaned.

Example

The present invention will illustrate by example now.Example only is example and can limit the scope of the invention by any way.

Chlorine consumption and swabbing pig effect during dead time

The device that example 1 utilizes Fig. 2 to describe is implemented.Correlated example A adopts the device identical with the device all respects of example 1 to implement, except it does not have the wall that separates holder and swabbing pig.The device of example 2,3 and correlated example B is identical in all fields with the device of example 1, except the location outlet makes 50%, 15% and 0% of medium-weight be lower than the minimum level of outlet respectively.

Between lag phase, be used for the process of measurement that chlorine consumes

When beginning to test, water (10L) adds in the top chamber.During flow circuit, water flows to the filtration unit from top chamber, removes particulate matter in filtration unit.After contact comprised the sterilant unit of single trichloroisocyanuric acid tablet (weight 7.5 grams), water flow through from filtration unit, and in the sterilant unit, the sterilant trichloroisocyanuric acid is added, then in holder.At the end of flow circuit, the water level in holder is stuck near the top of the wall in the device of routine 1-3 and correlated example B, and in the device of correlated example A, the water level of holder is stuck in the minimum level place of the outlet of swabbing pig simultaneously.Allowed water stagnation 8 days, to simulate the state of this device when not using.When begin dead time and the every day after the 5th day, the water sample that extracts in the holder is measured the amount of chlorine.Follow the program that the chlorine that provides estimates (Ed.Clesceri, L S, Greenberg, A E, Eaton, A D, the APHA of publisher, AWWA in 1998 and WEF, the 20 edition) in " standard method of water and examination of wastewater ".This result adopts and compares with initial chlorine, and the per-cent of the chlorine of consumption is represented (in two examples, initial chlorine is identical).

Be used to assess the program that swabbing pig is removed the effect of sterilant or its byproduct

Except not being that experimental arrangement is similar the stagnation in one week of simulation, repeat flow circuit, after the water of about 800L passed through device, biocide tablets fully consumed.After a biocide tablets consumption, the middle concentration of measuring tricyanic acid of purifying waste water in the distribution chamber of all devices, it is the byproduct of sterilant trichloroisocyanuric acid.The high more demonstration swabbing pig of the concentration of tricyanic acid effect is low more, and vice versa.

Experimental result: chlorine consumption and swabbing pig effect

Example	Wall	Be lower than the per-cent (%) of medium of the minimum level of swabbing pig middle outlet	Chlorine consumption (%) after week stagnation in the holder	The concentration (ppm) of tricyanic acid in the water at distribution chamber after consuming a tablet
					1	Have	99	54	0.5
2	Have	80	54	0.6
					3	Have	15	54	0.9
A	Do not have	99	86	0.5
					B	Have	0	54	3.0

The result

The result shows that according to device of the present invention, its feature in conjunction with the position of wall and outlet (routine 1-3) realized during dead time, significantly the chlorine consumption and relative better swabbing pig effect that reduces.The device of correlated example A shows swabbing pig effect relatively preferably, yet is to be cost with remarkable higher chlorine consumption.On the other hand, the device of correlated example B shows the chlorine consumption of remarkable minimizing, yet is to be cost with relatively low swabbing pig effect.Can find out also that from routine 1-3 the swabbing pig effect is along with the amount (calculating by weight percentage) of the medium of the minimum level that is lower than outlet increases and increases.

Be used to be evaluated at the program of swabbing pig possibility of pollution between the stage of replacement

This experiment is adopted the device of example 1 and is implemented according to the prior-art devices (correlated example C) of Fig. 2 of WO2004000732.Conventional device does not have the partition member that separates distribution chamber and swabbing pig and physically is present in swabbing pig in the distribution chamber.

Pollute in the experiment at mimic, replace swabbing pig by being immersed in 4% 30 seconds glove hand of chlorine bleach liquor, wherein clorox is as the simulating pollution thing.Then, assemble this device for use.Water is filled up in the top chamber.Program (Ed.Clesceri according to the chlorine estimation that in " standard method of water and examination of wastewater ", provides, L S, Greenberg, A E, Eaton, A D, the APHA of publisher, AWWA in 1998 and WEF, the 20 edition), after one hour, from distribution chamber (～1 L), take out the existence of water sample and analysis clorox.As can be seen, the water from the distribution chamber of the device of example 1 does not have detectable clorox (＜0.05 ppm), is presented to pollute to purify waste water on hand the possibility of the reduction of any pollution in the distribution chamber.On the other hand, the water that takes out from the distribution chamber of the device of correlated example C shows the clorox of 2.5ppm to be presented at the very high possibility that water pollutes in the distribution chamber.

It should be understood that according to gravity-fed treating plant of the present invention, make in the water in swabbing pig downstream sterilant or its byproduct concentration reduce, and have the significantly reduced possibility that the water in the distribution chamber pollutes.

Claims

1. gravity-fed purifier, it comprises the sterilant unit, by the wall swabbing pig isolating holder adjacent with the position, this swabbing pig comprises the medium that can remove described sterilant or its byproduct from water, distribution chamber with interconnection with the qualification flow passage, wherein sterilant adds in the water of holder by the sterilant unit, water flows through wall and arrives swabbing pig, and by outlet enter in the distribution chamber and

2. gravity-fed purifier as claimed in claim 1, the minimum level that weighs less than outlet of wherein said medium at least 75%.

3. as claim 1 or 2 described gravity-fed purifiers, wherein all basically described removing media are lower than the minimum level of outlet.

4. the arbitrary described gravity-fed purifier of claim as described above, the volume of device that wherein is used for keeping in the downstream of the upstream of described swabbing pig and described wall water is preferably less than 30% of reservoir volume.

5. the arbitrary described gravity-fed purifier of claim as described above, wherein said wall extends beyond described swabbing pig.

6. the arbitrary described gravity-fed purifier of claim as described above, wherein said wall extends upward the minimum level that surpasses outlet.

7. the arbitrary described gravity-fed purifier of claim as described above, wherein said medium is a carbon.

8. the arbitrary described gravity-fed purifier of claim as described above, wherein said sterilant unit comprises the sterilant that is contained in the sealing chamber, and is suitable for making described sterilant to contact with water, makes described sterilant add in the water.

9. the arbitrary described gravity-fed purifier of claim as described above, wherein water is maintained at one section predetermined period of described holder.

10. the arbitrary described gravity-fed purifier of claim as described above comprises top chamber, and it is suitable for receiving water to be clean, and is positioned at the upstream of holder and is communicated with its fluid.

11. the arbitrary described gravity-fed purifier of claim comprises filtration unit as described above, it is suitable for filtering particulate material, and is positioned at the upstream of holder and is in fluid communication with it.

12. gravity-fed purifier as claimed in claim 11, wherein said filtration unit between top chamber and holder, define a mobile passage, wherein water flows into the holder by filtration unit from top chamber.

13. the arbitrary described gravity-fed purifier of claim as described above, wherein said outlet is included in described swabbing pig and the isolating partition member of described distribution chamber, and described swabbing pig is detachably connected on the described partition member, makes swabbing pig to be changed and not contacted with the device of outlet downstream part is inner by the people.

14. the arbitrary described gravity-fed water cleaning systems of claim as described above, the shape of wherein said outlet and/or size configurations make, when described swabbing pig during from described partition member dismounting, staff can not contact with the internal surface of described distribution chamber.

15. gravity-fed water cleaning systems as claimed in claim 14, wherein said outlet has less than 5cm ²Cross-sectional area.