CN208249958U - EDI water treatment facilities - Google Patents

Abstract

The utility model discloses a kind of EDI water treatment facilities, including disc partition, inside is constructed using plate and frame, and dense room, light room are alternately arranged；Yin, yang resin is seated in respectively in two adjacent light rooms, centre is separated with Bipolar Membrane, and the H+ and OH+ of regenerating resin are generated by Bipolar Membrane；EDI water treatment facilities provided by the utility model, improved EDI have an excellent separating property for removing weak ion SiClx, and the generated OH ion of water decomposition effect that mechanism is to optimize in the EDI after packing material is easier to combine with SiO2.

Description

EDI water treatment facilities

Technical field

The utility model belongs to ultrapure water treatment field more particularly to a kind of EDI water treatment facilities.

Background technique

Electrodeionization (ED1) is coupled ion exchange membrane and ion exchange resin, the company of realization under the action of DC electric field A kind of novel separation technology of continuous deep desalting and the cyclic regeneration process of resin.

It is mainly characterized by by filling Ion Exchange Resin In The Mixing Bed in the freshwater room of conventional electrodialysis device, thus by electric Dialysis is combined with ion exchange, and used resin is regenerated without chemical acid alkali, and exhaust emission waste water, process are not equivalent to Continuously obtain regenerated mixed bed ion exchange.

E DI has become the Purewater Technique of mainstream, and has penetrated into electronics, medicine, biology, electric power, petrochemical industry, smelting In each industry such as gold and laboratory research in new high-tech field, and the future that decision Purewater Technique will be continued.By each main list First membrane separating process high integrity, organic integration and form this trend of integrated membrane process and meanwhile also just become membrane technology research Important development direction.

The EDI membrane stack usually produced mainly has plate and frame and spiral.

Plate and frame is developed by the construction of electrodialysis plant, and sheet frame is tight by two pieces of clamping plates and turnbuckle and nut Gu；It is film pair inside sheet frame, each film is constituted to by cation-exchange membrane, concentrated water partition, anion-exchange membrane, diluted gasket； The filling ion-exchange resin in light room, dense room and light room are alternately arranged.

The shape of spiral EDI device is similar to the membrane modules such as RO, NF, UF, and inside is sped structure, earliest by Christ company designs, and basic principle is identical as plate and frame device, essential structure are as follows: and the center of membrane module is electrode cores, Uniform electric field is constituted with external counterelectrode, anion and cation exchange membrane is rotated up most external counterelectrode around electrode cores, Ion Exchange Resin In The Mixing Bed is filled between anion and cation exchange membrane and constitutes deep or light room, and the edge of compartment is close using inertia artificial resin Envelope, does not need using partition.

Due to the Ion Exchange Resin In The Mixing Bed that EDI membrane stack loads in freshwater room, ion can be strengthened to exchange film surface Migration mass transport process.Therefore, the performance of EDI is heavily dependent on the performance of its internal ion exchange resin filled, The classification of resin, particle diameter, functional group structure, the degree of cross linking, exchange capacity, selectivity factor, counter ion degree of dissociation and Electrolyte concentration can have an impact to ion exchange process in solution.

Currently, the use of EDI is there are producing water water quality stability is high, intolerant to pickling alkali cleaning, cause using effect bad and Ton water cost greatly improves, and wherein there are also the spaces further promoted for internal structure and packing material.

Utility model content

The utility model to solve above-mentioned technical problem and the technical solution adopted is that provide a kind of EDI water treatment facilities, Wherein, the specific technical proposal is:

Including disc partition, inside is constructed using plate and frame, and dense room, light room are alternately arranged；Yin, yang resin is filled respectively It fills out in two adjacent light rooms, centre is separated with Bipolar Membrane, and the H+ and OH+ of regenerating resin are generated by Bipolar Membrane.

Above-mentioned EDI water treatment facilities, in which: disc partition uses the cylinder of glass-reinforced plastic material to fill as external support It sets.

Above-mentioned EDI water treatment facilities, in which: select that both there is highly selective coefficient, counter ion in EDI water treatment facilities Migration rate height, the ion exchange packing material with satisfactory electrical conductivity.

The utility model has the following beneficial effects: compared with the existing technology

1, the scope of application of raw water is expanded, using 0.1 μ S/cm as qualified water, conductivity of intaking is not filled by resin by dense room When 10 μ S/cm be increased to 18 μ S/cm after dense room potting resin；

2, concentrated water pH value increases with electric current and declines comparatively fast, and for current density in 3.3mA/cm2 or more, pH value is maintained at 2 Between~3, the slant acidity of this dense room is beneficial to prevent dense room fouling；

3, after the resin in the dense room of EDI module and pole room after filling optimization, current efficiency is opposite to be improved；

4, under same influent quality and experimental condition, it is average in 0.06~0.07 μ S/ that upper entering and lower leaving module produces water conductivity Cm, and bottom in and top out produces that water conductivity is average in 0.08~0.09 μ S/cm, mainly due to upper entering and lower leaving mode when, under resin Portion is more and more closely knit with water (flow) direction, reaches maximum in water outlet, therefore effluent quality is guaranteed.

The positive effect of the utility model also resides in: improved E D I has excellent except weak ion SiClx Separating property, the water decomposition that mechanism is to optimize in the EDI after packing material act on caused by O H ion be easier to and SiO2 It combines, to be allowed to be migrated under the action of electric field in the form of ion and be removed.It solves in EDI use process Light current ion is not easy the hard nut to crack removed.Fig. 2 is the Ion transfer optimized between the resin contacted with each other after packing material Schematic diagram；Ion generates migration on several directions as seen from the figure, to accelerate migration velocity, improves producing water water quality.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of EDI water treatment facilities.

Fig. 2 is the schematic diagram for optimizing the Ion transfer between the resin contacted with each other after packing material.

In figure:

1 disc partition, 2 sheet frame, 3 light 5 negative resin of room, 6 positive resin in dense room 4

Specific embodiment

The utility model will be further described with reference to the accompanying drawings and examples.

The utility model discloses a kind of EDI water treatment facilities, including disc, every 1 plate, inside uses 2 formula structure of sheet frame It makes, dense room 3, light room 4 are alternately arranged；Yin, yang resin (5,6) is seated in respectively in two adjacent light rooms 4, it is intermediate with bipolar Film separates, and the H+ and OH+ of regenerating resin are generated by Bipolar Membrane.

The utility model optimizes the design of EDI structure and packing material, improves the producing water water quality of whole equipment, service life Increase, maintenance cost decline.

Traditional rectangular clapboard is changed to disc partition 1, uses the cylinder of glass-reinforced plastic material as external means of support；This Kind mode can not only solve the problems, such as that yin, yang resin (5,6) regeneration rate is nonsynchronous；The thickness of light 4 partition of room can be increased again Degree, increases the loading of resin.

The regenerative process for being respectively 2%, 4%, 8% cation exchange resin being saturated by nickel ion to the degree of cross linking carries out Experimental study, conclusion show that the lower resin regeneration rate of the degree of cross linking is faster, and regeneration rate is higher；It additionally uses with phosphoric acid The inorganic ion exchanger basic zirconium phosphate (ZrP-1, ZrP-2) of group, which is filled in light room, removes copper ion in solution, as a result table Bright, when the concentration for copper ion of intaking is 0~0.5mmol/L, basic zirconium phosphate is to copper ion selectivity with higher, removal efficiency Also relatively high.Therefore, it should select that both there is highly selective coefficient in EDI device, counter ion migration rate is high, and has good The ion exchange packing material of good electric conductivity, so that up to 108~109V/m in ion exchange resin and film and solution interface layer Potential gradient, cause the 2nd Wien effect, accelerate water decomposition reaction, the final separative efficiency for improving EDI membrane stack.

Although the utility model is disclosed as above with preferred embodiment, so it is not intended to limit the utility model, any Those skilled in the art, without departing from the spirit and scope of the utility model, when can make a little modification and it is perfect, therefore this The protection scope of utility model, which is worked as, to be subjected to the definition of the claims.

Claims (3)

1. a kind of EDI water treatment facilities, it is characterised in that: including disc partition, inside is constructed using plate and frame, dense room, light Room is alternately arranged；Yin, yang resin is seated in respectively in two adjacent light rooms, centre is separated with Bipolar Membrane, the H of regenerating resin + generated with OH+ by Bipolar Membrane.

2. EDI water treatment facilities as described in claim 1, it is characterised in that: the cylinder of disc partition glass-reinforced plastic material As external means of support.

3. EDI water treatment facilities as claimed in claim 2, it is characterised in that: select that both there is Gao Xuan in EDI water treatment facilities Select property coefficient, counter ion migration rate height, the ion exchange packing material with satisfactory electrical conductivity.