CN210544407U

CN210544407U - Internal pressure type ultrafiltration membrane separation water purification system

Info

Publication number: CN210544407U
Application number: CN201920566727.4U
Authority: CN
Inventors: 林超
Original assignee: Weitai Technology Wuxi Co ltd
Current assignee: Weitai Technology Wuxi Co ltd
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2020-05-19
Anticipated expiration: 2029-04-24

Abstract

The utility model discloses an internal pressure type ultrafiltration membrane separation water purification system, which comprises a water source, a self-cleaning filter, an ultrafiltration membrane unit, a backwashing device and a water purification tank, wherein water is pumped by a water inlet pump and firstly passes through the self-cleaning filter, the self-cleaning filter is provided with a plurality of layers of filter layers, the ultrafiltration unit is arranged behind the self-cleaning filter, the rear part of the ultrafiltration unit is respectively connected with the water purification tank and the backwashing device, the backwashing device is provided with a water production tank, the purified water enters the water production tank after going out from the ultrafiltration membrane unit, a backwashing pump is arranged behind the water production tank, and the water production tank is operated by returning the ultrafiltration membrane unit through the backwashing pump; the operation efficiency is high, the energy consumption is low, no cleaning dead angle exists, and the washing efficiency is high.

Description

Internal pressure type ultrafiltration membrane separation water purification system

Technical Field

The utility model belongs to the sewage treatment field especially relates to an internal pressure formula milipore filter separation water purification system.

Background

The ultrafiltration membrane is a microporous filtration membrane with consistent pore size and rated pore size range of less than 0.01 micron, and each hollow fiber ultrafiltration membrane is composed of hundreds of tiny hollow fiber filaments. Solute molecules smaller than the pore size or particles larger than 10 nanometers in diameter can be screened out by applying appropriate pressure to one side of the ultrafiltration membrane. According to different water inlet modes, the ultrafiltration membrane is divided into an internal pressure type hollow fiber membrane and an external pressure type hollow fiber membrane, wherein the internal pressure type hollow fiber membrane means that stock solution permeates through hollow fibers from inside to outside along the radial direction to become permeate liquid under the action of pressure difference, and trapped substances are collected in the hollow fiber membrane.

And the water flow direction is opposite to the filtering direction in the backwashing mode of the internal pressure type membrane filtering membrane. During backwashing, the flow reaching the outer surface of the membrane is much higher, the flow of the whole membrane is ensured to be uniformly distributed, pollutants can be effectively removed, and the flow is very small when the inflow water reaches the inner part of the membrane, so that the inflow water pollutants of the internal pressure type structure are less. Can ensure economic backwashing in a short time interval, prevent the formation of a pollution layer from the source, and can also ensure low operation pressure and low chemical cleaning frequency. Backwash effluent can be drained through the membrane.

The area and flux of single membrane of the pressure type membrane component are much higher, the application range is wider, besides the field of water treatment and purification, the pressure type membrane component is also widely used in various special separation processes in chemical industry, food industry and other industries.

In the application number: CN200820138729.5, having an application date of 20081114, with the name: the patent of an external pressure type hollow capillary tube type ultrafiltration water purifier component discloses an external pressure type hollow capillary tube type ultrafiltration water purifier component, which permeates stock solution into an inner cavity of a hollow capillary tube membrane from the outer wall of the hollow capillary tube membrane, is opposite to the traditional internal pressure operation path, impurities in the stock solution do not block the capillary tube, and the impurities are washed more easily, thereby prolonging the washing time, saving the washing water, greatly prolonging the service life of an ultrafiltration membrane, and being beneficial to energy conservation, emission reduction and consumption reduction.

Disclosure of Invention

The utility model aims at providing an internal pressure formula milipore filter separation water purification system in order to overcome the defect that above-mentioned prior art exists.

The purpose of the utility model can be realized through the following technical scheme:

the utility model provides an internal pressure formula milipore filter separation water purification system, includes the water source, self-cleaning filter, the milipore filter unit, backwash device, clean water reservoir, water draws water through the intake pump and passes through the self-cleaning filter earlier, the self-cleaning filter is equipped with the multilayer filter layer, sets up the milipore filter unit behind the self-cleaning filter, clean water reservoir and backwash device are connected respectively to the milipore filter unit rear portion, backwash device is equipped with the product water tank, and the product water tank is gone into after the clean water goes out from the milipore filter unit, is equipped with the backwash pump behind the product water tank, and what produce the water tank returns the milipore filter unit through the backwash pump and carries out backwash milipore filter unit, be equipped with.

Preferably, the chemical dosing ports are provided with a plurality of chemical dosing ports, and the chemical dosing ports are filled by a chemical cleaning dosing pump.

More preferably, the number of the chemical dosing ports is 3.

Preferably, the ultrafiltration membrane module is provided with a plurality of groups of hollow fiber filaments, each hollow fiber filament is a seven-hole membrane, and the seven-hole membrane is fixed by a support layer 1.2 through 7 capillary tubes 1.1 to form one hollow fiber filament.

More preferably, the capillary tube 1.1 is provided with a multilayer structure, and sequentially comprises a compact inner skin layer a, a first loose layer b, an elastic supporting layer c with uniform connection water permeability, a second loose layer d and a porous outer skin layer e from inside to outside.

More preferably, the capillary 1.1 is made of modified polyethersulfone.

More preferably, the material of the support layer 1.2 is modified polyethersulfone.

The utility model has the advantages that:

the system is convenient to install, small in occupied area, reliable in integrated operation, strong in stability, free of air washing and capable of reducing the risk of broken wires; the operation efficiency is high, the energy consumption is low, no cleaning dead angle exists, and the washing efficiency is high.

Drawings

Fig. 1 is a schematic structural diagram of an internal pressure type ultrafiltration membrane separation water purification system.

Fig. 2 is a schematic structural view of a hollow fiber yarn.

Fig. 3 is a schematic cross-sectional structure of a capillary tube.

Detailed Description

The technical scheme of the utility model is further described with the attached drawings:

In practice, the apparatus may be used for cleaning and purifying fish pond water, wherein the water source is taken from well water.

The self-cleaning filter is arranged for coarsely filtering large-particle impurities of a lower water source before the ultrafiltration membrane unit filters, and the impurities are prevented from damaging a filter element of the ultrafiltration membrane unit.

The system also has a chemical dosing mode in the operation step to enhance backwashing. Chemical dosing enhanced backwash (CEB) uses low flow to ensure that chemicals are better distributed on the membrane surface. The chemicals are soaked for several minutes after entering the surface of the membrane so that the chemicals have enough reaction time

In this embodiment, preferably, the chemical dosing ports are provided in plurality, and the chemical dosing ports are filled by a chemical cleaning dosing pump.

In this embodiment, it is more preferable that there are 3 chemical adding openings.

In this embodiment, preferably, the ultrafiltration membrane module is provided with a plurality of groups of hollow fiber filaments, each hollow fiber filament is a seven-hole membrane, and the seven-hole membrane is fixed by a support layer 1.2 through 7 capillary tubes 1.1 to form one hollow fiber filament.

In this embodiment, it is more preferable that the capillary tube 1.1 has a multilayer structure, and the multilayer structure includes, from inside to outside, a dense inner skin layer a, a first porous layer b, an elastic support layer c with uniform connection water permeability, a second porous layer d, and a porous outer skin layer e.

In this embodiment, the material of the capillary 1.1 is more preferably modified polyethersulfone.

In this embodiment, it is more preferable that the material of the support layer 1.2 is modified polyethersulfone.

As shown in the figure, the utility model comprises: the ultrafiltration membrane component comprises a water pump in sequence, before entering the membrane component, a self-cleaning filter, an ultrafiltration membrane unit, a water production tank, a backwashing pump and a chemical dosing port are arranged to ensure that no impurity exists in inlet water in advance, and outlet water of the system is discharged into a fish pond for recycling.

A complete ultrafiltration cycle consists of different process steps and is automatically carried out by a control system. In the filtration mode, the feed water is purified.

The length of the filtration mode depends greatly on the quality of the feed water. Typically the filtration time is 30-180 minutes followed by a backwash. The novel membrane piece can alternately feed water from the upper part and the lower part, which can ensure that the dirt is uniformly distributed on the surface of the membrane and correspondingly increases the backwashing efficiency. The dirt in the feed water in the filtration mode is blocked and accumulated on the surface of the membrane to form a dirt layer. Periodic backwashing is required to remove foulants to maintain the membranes in good operating conditions.

Further backwash water is taken from the filtration/backwash tank and enters the membrane through the filtration side. The entry from the outside to the inside of the membrane and the filtration mode are reversed such that the fouling layer on the membrane surface is lifted. The backwash water flushes the entire hollow fiber membrane and then is discharged from the water inlet. The amount of backwash water is typically 2-3 times the amount of filtered water in order to achieve better backwash efficiency. This has a higher backwash mechanical scouring force than the filtration mode. The backwash time is 30-60 seconds depending on the feed water quality. The backwash direction depends on the previous filtration mode. For example, top filtration mode foulants accumulate primarily at the lower end of the hollow fiber membrane.

The most effective way to flush these contaminants is to backwash in the same direction as the previous filtration. In this case, the backwash direction is from top to bottom, and the operation mode is called top backwash mode. This ensures that the dirt is flushed out in the shortest path. The backwashing from bottom to top is called bottom backwashing by the same principle.

The system also has a chemical dosing mode in the operation step to enhance backwashing. Chemical dosing enhanced backwash (CEB) uses low flow to ensure that chemicals are better distributed on the membrane surface. Soaking the chemical for several minutes after entering the membrane surface allows sufficient reaction time for the chemical. During this time the ultrafiltration system is in a standstill state.

Chemical dosing: sodium hypochlorite (NaClO) is used for alkali washing; citric acid, HCl, H can be used for pickling₂SO₄One kind of (1).

The raw material of the membrane product is modified polyether sulfone (MPES), and 7 capillaries are collected into one membrane wire by the membrane wire, so that a support structure with extremely high strength is formed. This structure greatly enhances the membrane filament stability. The PES polymer has higher hydrophilic performance after being modified. The better the hydrophilic property, the less easily the membrane yarn surface adsorbs organic matter, so the better the contamination resistance. The inner surface of the seven-hole membrane bundle is a very thin filtering layer with the filtering pore size of 20nm, and the structure ensures that the filtering resistance of the membrane filaments is very low. The membrane filament support layer is an asymmetric structure with an external pore size of about 1 μm. Although the filtering pore diameter of the membrane silk is very small, the pure water flux of the membrane is still as high as 700LMH/bar due to the optimization of the opening rate of the membrane silk and the asymmetric structure of the membrane silk, and the method has obvious advantages. The operation mode of the ultrafiltration system is internal pressure type filtration, and the system integration is centrally placed in a container by virtue of unique integrated membrane components and rack products thereof, and is matched with related pipelines and prefilters to carry out on-site installation and on-site and remote system control.

Finally, it should be noted that:

the skilled person can, with reference to the present disclosure, carry out the method and carry out its application, it being expressly noted that all similar substitutes and modifications apparent to the skilled person are deemed to be included within the present invention. The method and application of the present invention have been described in terms of preferred embodiments, and it will be apparent to those skilled in the art that the techniques of the present invention may be practiced and used without departing from the spirit and scope of the present invention by modifying or otherwise appropriately changing or combining the various methods and applications of the present invention.

Claims

1. The utility model provides an internal pressure formula milipore filter separation water purification system which characterized in that:

including the water source, self-cleaning filter, milipore filter unit, backwash device, clean water reservoir, water draws water through the intake pump and passes through self-cleaning filter earlier, self-cleaning filter is equipped with the multilayer filter layer, sets up the hyperfiltration unit behind the self-cleaning filter, water reservoir and backwash device are connected respectively to the hyperfiltration unit rear portion, backwash device is equipped with produces the water tank, and the water tank is produced in the income after the water tank is gone out from the milipore filter unit to the clean water, is equipped with the backwash pump behind the product water tank, and what produce the water tank returns the milipore filter unit through the backwash pump and carries out backwash milipore filter unit, be equipped with chemistry between backwash pump and.

2. The internal pressure type ultrafiltration membrane separation water purification system of claim 1, which is characterized in that: the chemical dosing ports are multiple in number and are fed through a chemical cleaning dosing pump.

3. The internal pressure type ultrafiltration membrane separation water purification system of claim 2, which is characterized in that: the chemical dosing openings are provided with 3.

4. The internal pressure type ultrafiltration membrane separation water purification system of claim 1, which is characterized in that: the ultrafiltration membrane component is provided with a plurality of groups of hollow fiber yarns, each hollow fiber yarn is a seven-hole membrane, and the seven-hole membrane is fixed by a supporting layer (1.2) through 7 capillary tubes (1.1) to form one hollow fiber yarn.

5. The internal pressure type ultrafiltration membrane separation water purification system of claim 4, wherein: capillary (1.1) is equipped with multilayer structure, by interior to outer compact endotheca layer (a), first loose layer (b), evenly connect water permeability elastic support layer (c), loose layer of second (d), porous ectotheca (e) of being in proper order.

6. The internal pressure type ultrafiltration membrane separation water purification system of claim 4, wherein: the capillary (1.1) is made of modified polyether sulfone.

7. The internal pressure type ultrafiltration membrane separation water purification system of claim 4, wherein: the supporting layer (1.2) is made of modified polyether sulfone.