Ultrapure water preparation system for secondary reverse osmosis

Abstract

The utility model discloses an ultrapure water preparation system for secondary reverse osmosis, which comprises a raw water tank, a first reverse osmosis device, a middle water tank, a second reverse osmosis device and an EDI (Electronic Data Interchange) device which are sequentially communicated through a pipeline, and a first ORP (Oxidation Reduction Potential) on-line monitoring device is arranged in the middle water tank; a rear reducing agent dosing device, an alkali dosing device, a PH online monitoring device and a second ORP online monitoring device are sequentially arranged between the middle water tank and the pipeline of the second reverse osmosis device, and the concentrated water outlets of the second reverse osmosis device and the EDI device are both connected with a backwashing water tank; and a water outlet of the backwashing water tank is communicated with a water inlet of the second reverse osmosis device. The utility model has the advantage that the operation cycle of the second reverse osmosis device and the EDI device can be effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field, especially a kind of for secondary reverse osmosis's ultrapure water preparation system. BACKGROUND

[0002] For the same large enterprise different subordinate factory to be used to soften water, each subordinate factory can not simultaneously construct softening water device, so that the same enterprise is built unified softening water supply unit, namely central water treatment plant, process is generally pretreatment+ultrafiltration+first reverse osmosis, and the softening water produced is supplied to different subordinate factory;Some subordinate factory softening water can meet the demand of this unit, but some subordinate unit needs ultrapure water, so the unified supply of softening water cannot meet the ultrapure water quality requirement of subordinate factory, so subordinate factory needs to construct second reverse osmosis+EDI system to meet the water quality requirement, namely central water treatment softening water+second reverse osmosis+EDI system.

[0003] Disadvantages of prior art:

[0004] Central water treatment plant has scale inhibitor, reducing agent, bactericide and other dosing devices before first reverse osmosis inlet water, which can meet the requirements of first reverse osmosis inlet water (residual chlorine≤0.1mg / l), but cannot meet the requirements of EDI operation on inlet water residual chlorine (residual chlorine is required to be 0).

[0005] The second reverse osmosis+EDI system constructed to subordinate factory often ignores the installation of reducing agent device and residual chlorine online monitoring device in the second reverse osmosis inlet pipe because the central water treatment plant has installed reducing agent device before first reverse osmosis inlet water, which leads to that the oxidation residual chlorine of EDI inlet water exceeds the standard, and with the increase of operation time, the internal resin of EDI is broken due to the oxidation of cumulative inlet water residual chlorine, and the water production of EDI equipment is obviously reduced, which causes irreversible damage to EDI. Utility model content

[0006] The utility model aims at providing a kind of for secondary reverse osmosis's ultrapure water preparation system, which can effectively prolong the running cycle of second reverse osmosis device and EDI device.

[0007] The above technical purpose of the utility model is realized by the following technical scheme:

[0008] A kind of ultra-pure water preparation system for secondary reverse osmosis, characterized by, including the raw water tank, first reverse osmosis device, intermediate water tank, second reverse osmosis device and EDI device sequentially communicated by pipeline, first ORP online monitoring device is arranged in the intermediate water tank, post-reducing agent dosing device, alkali dosing device, PH online monitoring device and second ORP online monitoring device are sequentially arranged between the pipeline of intermediate water tank and second reverse osmosis device, the concentrated water outlet of second reverse osmosis device and EDI device is connected with a backwash water tank, the water outlet of backwash water tank is communicated with the water inlet of second reverse osmosis device.

[0009] Preferably, first reactor and second reactor are sequentially arranged between the raw water tank and first reverse osmosis device by pipeline, PAC dosing device is connected to the first reactor, and PAM dosing device is connected to the second reactor.

[0010] Preferably, bactericide dosing device, scale inhibitor dosing device and pre-reducing agent dosing device are sequentially arranged between the second reactor and first reverse osmosis device.

[0011] Preferably, first high-pressure pump is connected to the water outlet of intermediate water tank, and post-reducing agent dosing device, alkali dosing device, PH online monitoring device and second ORP online monitoring device are arranged on the pipeline between first high-pressure pump and second reverse osmosis device.

[0012] Preferably, first electromagnetic valve is arranged on the pipeline between second ORP online monitoring device and second reverse osmosis device, backflow pipeline is arranged on the pipeline between second ORP online monitoring device and first electromagnetic valve and communicated with the water inlet of first high-pressure pump, and second electromagnetic valve is arranged on the backflow pipeline.

[0013] Preferably, second ORP online monitoring device is electrically connected with first electromagnetic valve and second electromagnetic valve, first ORP online monitoring device is electrically connected with post-reducing agent dosing device, and PH online monitoring device is electrically connected with alkali dosing device.

[0014] Preferably, UV sterilizer is connected between second reverse osmosis device and EDI device by pipeline, and terminal filter is connected to the water outlet of EDI device.

[0015] Preferably, security filter is connected to the water outlet of backwash water tank, second high-pressure pump is connected to the water outlet of security filter, and the water outlet of second high-pressure pump is communicated with the water inlet of second reverse osmosis device.

[0016] Preferably, the pipe connecting the concentrate outlet of the EDI device and the backwash water tank is further equipped with a third solenoid valve. In summary, this utility model has the following beneficial effects:

[0017] This invention can correct the problem that the addition of reducing agent by the central water treatment plant cannot meet the residual chlorine requirements of the EDI equipment in the branch plant. By real-time monitoring of the first ORP online monitoring device, the instrument data is used to interlock the start and stop of the post-reducing agent dosing device, thus avoiding over- or under-addition of reducing agent and ensuring that the amount of reducing agent added is appropriate. At the same time, the second ORP online monitoring device can realize the opening and closing of the return pipe, thereby preventing the untreated water from entering the second reverse osmosis unit.

[0018] This invention enables the recycling of concentrated water generated by the EDI device. Since the salt content, organic matter, hardness and other components of the EDI concentrated water are relatively lower than those of the water after the first-stage reverse osmosis treatment, the high sodium hypochlorite content can fully meet the feed water requirements of the subsequent secondary reverse osmosis after being treated by the post-reducing agent dosing device and the alkali dosing device.

[0019] This invention effectively extends the operating cycle of the second-stage reverse osmosis and EDI devices by backwashing the second reverse osmosis and EDI devices with the concentrated water from the filtered second reverse osmosis and EDI devices. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the system structure of this utility model. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation on this utility model.

[0022] like Figure 1 The ultrapure water preparation system for two-stage reverse osmosis shown includes a raw water tank 1, a first reverse osmosis unit 4, an intermediate water tank 5, a second reverse osmosis unit 7, and an EDI unit 9 connected in sequence by pipelines. The intermediate water tank 5 is equipped with a first ORP online monitoring device 16. A post-reducing agent dosing device 19, an alkali dosing device 20, a pH online monitoring device 17, and a second ORP online monitoring device 18 are also connected in sequence between the intermediate water tank 5 and the second reverse osmosis unit 7. The concentrate outlets of the second reverse osmosis unit 7 and the EDI unit 9 are both connected to a backwash water tank 23. The outlet of the backwash water tank 23 is connected to the inlet of the second reverse osmosis unit 7.

[0023] The raw water tank 1 and the first reverse osmosis unit 4 are also connected by pipes to a first reactor 2 and a second reactor 3. The first reactor 2 is connected to a PAC dosing device 11, and the second reactor 3 is connected to a PAM dosing device 12.

[0024] The pipeline between the second reactor 3 and the first reverse osmosis device 4 is further sequentially provided with a bactericide dosing device 13, a scale inhibitor dosing device 14 and a pre-reducing agent dosing device 15.

[0025] The outlet of the intermediate water tank 5 is connected with a first high-pressure pump 6, a post-reducing agent dosing device 19, an alkali dosing device 20, a pH online monitoring device and a second ORP online monitoring device 18 are arranged on the pipeline between the first high-pressure pump 6 and a second reverse osmosis device 7.

[0026] A first electromagnetic valve 21 is further arranged on the pipeline between the second ORP online monitoring device 18 and the second reverse osmosis device 7, a reflux pipeline is further arranged in communication with the water inlet of the first high-pressure pump 6, and a second electromagnetic valve 22 is arranged on the reflux pipeline.

[0027] The second ORP online monitoring device 18 is electrically connected with the first electromagnetic valve 21 and the second electromagnetic valve 22, the first ORP online monitoring device 16 is electrically connected with the post-reducing agent dosing device 19, and the pH online monitoring device 17 is electrically connected with the alkali dosing device 20.

[0028] A UV sterilizer 8 is further connected between the second reverse osmosis device 7 and an EDI device 9, and an end filter 10 is further connected to the water outlet of the EDI device 9.

[0029] The water outlet of the backwashing water tank 23 is further connected with a security filter 24, the water outlet of the security filter 24 is further connected with a second high-pressure pump 25, and the water outlet of the second high-pressure pump 25 is in communication with the water inlet of the second reverse osmosis device 7.

[0030] A third electromagnetic valve 26 is further arranged on the pipeline connected between the concentrated water outlet of the EDI device 9 and the backwashing water tank 23.

[0031] The utility model can correct that the central water treatment plant cannot meet the requirement of the EDI equipment inlet water residual chlorine of branch plant by adding reducing agent, can avoid adding too much or too little reducing agent through real time monitoring first ORP online monitoring device, through instrument data, interlocking post-reducing agent dosing device start-stop, so that the reducing agent addition amount is appropriate, and the opening and closing of the reflux pipeline are realized through the second ORP online monitoring device, so that the treatment water which does not meet the requirement is avoided to enter the second reverse osmosis device.

[0032] The utility model can recycle the concentrated water generated by the EDI device, the salt, organic matter, hardness and other components of the EDI concentrated water are relatively low after the first reverse osmosis treatment, and the high component sodium hypochlorite in it can completely meet the inlet water requirement of subsequent secondary reverse osmosis after being treated by the post-reducing agent dosing device and the alkali dosing device.

[0033] The utility model discloses a second reverse osmosis device and the concentrated water of EDI device are carried out backflushing to second reverse osmosis device and the concentrated water of EDI device, can effectively prolong two -stage reverse osmosis, EDI running cycle.

[0034] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, and the person skilled in the art can make various modifications or equivalent replacement to the utility model within the utility model's essence and protection scope, and this kind of modification or equivalent replacement should be regarded as falling within the protection scope of the utility model technical scheme.

Claims

1. A system for producing ultrapure water using secondary reverse osmosis, characterized by, The raw water tank, the first reverse osmosis device, the intermediate water tank, the second reverse osmosis device and the EDI device are sequentially connected by pipelines, the first ORP online monitoring device is arranged in the intermediate water tank, a post-reducing agent dosing device, an alkali dosing device, a PH online monitoring device and a second ORP online monitoring device are sequentially arranged between the pipeline between the intermediate water tank and the second reverse osmosis device, the concentrated water outlet of the second reverse osmosis device and the EDI device is connected with a backwashing water tank, and the water outlet of the backwashing water tank is communicated with the water inlet of the second reverse osmosis device.

2. The system for producing ultrapure water using secondary reverse osmosis according to claim 1, wherein: The first reactor and the second reactor are sequentially arranged between the raw water tank and the first reverse osmosis device by pipelines, the first reactor is connected with a PAC dosing device, and the second reactor is connected with a PAM dosing device.

3. The system for producing ultrapure water using secondary reverse osmosis according to claim 2, wherein: A bactericide dosing device, a scale inhibitor dosing device and a pre-reducing agent dosing device are sequentially arranged between the pipeline between the second reactor and the first reverse osmosis device.

4. The system for producing ultrapure water using secondary reverse osmosis according to claim 1, wherein: The water outlet of the intermediate water tank is connected with a first high-pressure pump, the post-reducing agent dosing device, the alkali dosing device, the PH online monitoring device and the second ORP online monitoring device are arranged on the pipeline between the first high-pressure pump and the second reverse osmosis device.

5. The system for producing ultrapure water using secondary reverse osmosis according to claim 4, wherein: A first electromagnetic valve is arranged on the pipeline between the second ORP online monitoring device and the second reverse osmosis device, a reflux pipeline is arranged on the pipeline between the second ORP online monitoring device and the first electromagnetic valve and communicated with the water inlet of the first high-pressure pump, and a second electromagnetic valve is arranged on the reflux pipeline.

6. The system for producing ultrapure water using secondary reverse osmosis according to claim 5, wherein: The second ORP online monitoring device is electrically connected with the first electromagnetic valve and the second electromagnetic valve, the first ORP online monitoring device is electrically connected with the post-reducing agent dosing device, and the PH online monitoring device is electrically connected with the alkali dosing device.

7. The system for producing ultrapure water using secondary reverse osmosis according to claim 1, wherein: A UV sterilizer is arranged between the second reverse osmosis device and the EDI device by a pipeline, and a terminal filter is arranged at the water outlet of the EDI device.

8. The system for producing ultrapure water using secondary reverse osmosis according to claim 1, wherein: A security filter is arranged at the water outlet of the backwashing water tank, a second high-pressure pump is arranged at the water outlet of the security filter, and the water outlet of the second high-pressure pump is communicated with the water inlet of the second reverse osmosis device.

9. The system for producing ultrapure water using secondary reverse osmosis according to claim 1, wherein: A third electromagnetic valve is arranged on the pipeline between the concentrated water outlet of the EDI device and the backwashing water tank.

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