DE2260402A1 - Ion exchanged demineralising plant - for continuous water treatment, has separate pipes connecting cation exchanger outlet to anion exchanger - Google Patents

Abstract

Appts. for continuous treatment of water by ion exchange, in which the raw water pipe has valved branch pipes leading to each cation exchanger, from each of which a pipe with a valve leads to an anion exchanger and from which in turn a pipe with a valve is connected to the demineralised water output pipe, and in which feed pipes for the HCl and NaOH lead to the cation and anion exchangers respectively via pipes incorporating valves, while pipes with valves lead from all the exchangers to the discharge pipes opening into the discharge channel, as in the parent patent, the improvement whereby each cation exchanger outlet is connected to the corresp. inlet of the associated anion exchanger via a separate pipe incorporating valves.

Description

Device for the continuous operation of an ion exchange system for the treatment of water addendum to patent. ... ... (Pat. Note P 17 92 017.1-41) In the main patent specification is a device for continuously operating a Described ion exchange system for the treatment of water, in which the raw water pipe Has branch lines with valves to the individual ion exchangers, of which lines with valves lead to the anion exchangers, from which lines lead with valves to the line for the desalinated water that a disconnectable'Zuleitung for the hydrochloric acid via lines with valves to the cation exchangers and one the same supply line for the lye via lines with valves to the anion exchangers, and that finally of all exchangers Pipelines with valves lead to the drainage lines that open into the flow channel, according to patent. ... ... (patent application P 17 92 017.1-41).

With this device described in the main patent specification aims, in a kind of cycle, only ever part of the exchangers regenerate, whereby, in contrast to other systems, complex regeneration devices are not required and therefore a lot compared to double systems of the same performance less exchanger material is required or not removed from the containers must become. The cation and anion exchangers present in the same number are used for this purpose switched off in pairs from the work process and regenerated, so that continuously work can be carried out and an operational system is always available. In the case of a 3 or 4-street layout, when a street is being regenerated, there is no stop only one, but two or three streets are available for operation. Such a one The system can advantageously work according to your short-cycle method.

It has now been found that such a system can be significantly improved by proceeding in such a way that each outcome has one Cation filter with the corresponding input of the associated Bnionenfiltera a separate line is connected with the interposition of valves.

This measure has the considerable advantage that, for example in the event of a malfunction on a road, this road is removed from the work process become kane and this disorder can be eliminated, with such Failures can occur, for example, due to a drop in hardness in the anion filter and then you have the smoothness by feeding hydrochloric acid into the anion filter in question to put the road back in order and to restart the work process. The design of the system also has the significant advantage that a short-cycle process in connection with normal floating bed operation and countercurrent regeneration Can apply.

The combination of these three process steps can be used for desalination plants as well as for water softening systems, whereby an optimal utilization of the Ion exchanger and also a high degree of purity of the desalinated water is achieved can be. In addition, there is the further advantage that the system has great elasticity offers with fluctuating water withdrawal.

The additional invention is based on the following description an exemplary embodiment explained in more detail in conjunction with the drawing.

The embodiment shown in the drawing shows a system with three streets, each street consisting of a cation filter 13 or 14 or 15 and an associated anion filter 16 or 17 or 18, respectively. The entrances 19 the cation filters 113,14,15 are via lines 20 with the interposition of Valves 1 connected to the raw water connection 21, while the outputs 22 with the corresponding input 24 of the associated anion filter 16,17,18 via separate Lines 23 are connected with the interposition of valves 2 and 3. To the Outputs 25 of the anion filters 16, 17; is the manifold 26 for the fully demineralized resp.

purified water connected. In these lines 26 are å respectively Valves 4 arranged.

For regeneration with hydrochloric acid, the hydrochloric acid is added a line 28 with a shut-off valve 7, which is connected to an injector 27 in a branch line 29 opens from the raw water line 21. The line 29 is connected in each case connected by the valves 6 to the output 22 of the cation filters 13,14,15. Furthermore, the inlets 19 are arranged on a regeneration outlet 30 for the hydrochloric acid, valves 8 are interposed.

The regeneration lines for supplying the lye for regeneration the anion filter 16,17,18 have a lauwn feed line 31, which is connected to another Injector 27 opens into a connecting line 32 to the cation filter group 13,14,15. This line 32 is connected to the outputs with valves 9 interposed 22 of the cation filters 13, 14, 15 are connected. The line settles at injector 27 32 in a line 33, with the outputs 25 of the anion filter via valves 10 16,17,18 are connected. The inputs of these anion filters 16, 17, 18 are again via a line 34 and via valves 12 to the regeneration outlet 35 for the lye connected.

For the operation of such a system according to the Eurztakt procedure there are, for example, the streets 13, 16 or 14, 17 in operation, while the other road 15, 18 is being regenerated.

When roads 13, -16 and 14, 17 are in operation, the raw water overflows the lines 21, 20 via the corresponding valves 1- to the input 19 through which Filter from the bottom up to the outlet 22 and from there via the valves 2 and the Lines 23 via the further valves 3 to the inputs 24 of the anion filters 16, 17, From there the water rises to the outlets 25 and passes through the valves 4 and the lines 26 as fully demineralized or filtered water to the consumer. Normal operation of the system is based on the floating bed process.

To regenerate the street with filters 15 and 18, first the cation filter 15 is regenerated with hydrochloric acid, the valve 7 being opened and hydrochloric acid flows in via line 28 and mixed with raw water via the Line 29 and the opened valve 6 reaches the outlet 22 of the filter 15. there the liquid exits at inlet 19 into line 20 and passes through the valve 8 to expiry 30.

The valve is used to regenerate the anion filters 16, 17, 18 with lye 11 opened in the liquor line 31, with degummed water over at the injector 27 the ion filter 15 is zugemisoh via the line 32 when the Valve 9 and line 20 when valve 1 is open. The diluted liquor arrives via the line 33 and the open valve 10 of the anion filter 18 to the outlet 25 of this filter and from there via the input 24, part of the line 23 via the opened valve 12 into the drain 35. After flushing the regenerated road 15.18 this is put into operation and another road regenerates.

If, for example, the road falls in the mode of operation described with the filters 14, 17 by a hardness drop, then the first street can 13, 16 continue to operate while in the street with the filters 14, 17 the fault is eliminated. The acid washing of the anion filter 17 is carried out by that first the associated cation filter 14 is normally regenerated with hydrochloric acid. The sucked in hydrochloric acid is diluted in the injector 27 by raw water, via the Valve 6 passed into the cation filter 14 from above and discharged via the valve 8. If the cation filter 14 is regenerated, i.e. the hardness builders located in the filter are removed, hydrochloric acid is again in the same way into the cation filter 14 brought. Now, by switching over to the electronic control unit, the flow will be permanent of raw water via the associated valve 1 which is located in the cation filter 14 Acid via the associated line 23 with valves 2 and 3 from below into the ion filter 17 passed and leaves the filter via the flow valve 5. When flowing through the Anion filter 17 from bottom to top, the hardness builders that have penetrated are removed. The anion filter 17 must then be rinsed and regenerated again with sodium hydroxide solution will.

Claims (1)

Claim Device for the continuous operation of an ion exchange system for the treatment of water, where the raw water pipe branch pipes with valves to the individual cation exchangers, of which lines with valves lead to the anion exchangers, from which lines with valves to the line for the desalinated water that a disconnectable supply line for the hydrochloric acid Via lines with valves to the ion exchangers and a supply line of this type for the lye via Leiunten. Valves to the anion exchangers, and that, finally, from all exchangers, newspapers with valves to the drainage pipes lead, which open into the drainage channel, according to patent. ... ... (Pat.Notes:, P 17 92 017.1-41), characterized in that again the output (22) of a cation filter (13,14,15) with the corresponding input (24) of the associated anion filter (16,17,18) connected via a separate line (23) with the interposition of valves (2,3) is. L e r s e i t e