CN208345913U - A kind of sea water nanofiltration desalination system - Google Patents

A kind of sea water nanofiltration desalination system Download PDF

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Publication number
CN208345913U
CN208345913U CN201820334550.0U CN201820334550U CN208345913U CN 208345913 U CN208345913 U CN 208345913U CN 201820334550 U CN201820334550 U CN 201820334550U CN 208345913 U CN208345913 U CN 208345913U
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nanofiltration
water
sea water
desalination system
reactor
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CN201820334550.0U
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徐秀萍
宋丰伟
王可为
仲卫东
董正帅
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State Nuclear Electric Power Planning Design and Research Institute Co Ltd
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State Nuclear Electric Power Planning Design and Research Institute Co Ltd
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Abstract

The utility model discloses a kind of sea water nanofiltration desalination systems, belong to field of sea water desalting technology.The system includes nanofiltration device, and the nanofiltration device has water inlet, output water out and concentrated water outlet;With the desalter of the output water outlet;It is characterized in that, the sea water nanofiltration desalination system further include: the reactor with the concentrated water outlet has phosphate and ammonium salt in the reactor.Sea water nanofiltration desalination system provided by the embodiment of the utility model passes through setting reactor and concentrated water outlet; the concentrated water containing divalent and the above ion under making nanofiltration device shut off is delivered in reactor; magnesium ion in concentrated water in reactor phosphate and ammonium salt react; generating ammonium magnesium phosphate etc. can be used as the crystal of fertilizer; sea is directly discharged to so as to avoid concentrated water or will cause the wasting of resources for producing the lower Nacl of purity; be conducive to the comprehensive utilization of seawater, while improving the surcharge of sea water nanofiltration desalination system.

Description

A kind of sea water nanofiltration desalination system
Technical field
The utility model relates to field of sea water desalting technology, in particular to a kind of sea water nanofiltration desalination system.
Background technique
Sea water desalination is a kind of new and high technology that fresh water is wanted to ocean, and seawater is that a kind of salt content is high, hardness is big, turbidity It changes big while being suspended with the organic and inorganic particles of different-grain diameter and the saline solution of microorganism, seawater desalination system is A kind of seawater desalination obtains the desalination system of fresh water.
In the related technology, nanofiltration device is applied in seawater desalination system usually as a kind of pro desalting device.Nanofiltration dress The nanofiltration membrane set is shut off the ion of divalent or more, and the output water by monovalention, containing monovalention is allowed to continue It is handled through desalter, fresh water is prepared, the concentrated water containing divalent and the above ion being trapped typically directly is discharged into Sea or for producing the lower Nacl of purity.
The existing technology has at least the following problems for designer's discovery:
The concentrated water containing divalent and the above ion being trapped contains a large amount of magnesium ion, is directly discharged to sea or is used for The production lower Nacl of purity will cause the wasting of resources.
Utility model content
The utility model provides a kind of sea water nanofiltration desalination system, can solve above-mentioned technical problem.
Specifically, including technical solution below:
A kind of sea water nanofiltration desalination system, comprising:
Nanofiltration device, the nanofiltration device have water inlet, output water out and concentrated water outlet;
With the desalter of the output water outlet;
The sea water nanofiltration desalination system further include:
The reactor of inlet and the concentrated water outlet has phosphate and ammonium salt in the reactor, for Magnesium ion reacts in concentrated water, generates ammonium magnesium phosphate;And
The dewaterer being connected to the liquid outlet of the reactor.
In a kind of possible design, the nanofiltration device includes level-one nanofiltration device or multistage nanofiltration device;
And the multistage nanofiltration device includes the nano-filtration unit of multiple parallel connections.
In a kind of possible design, the desalter is reverse osmosis equipment.
In a kind of possible design, the reactor includes phosphate medicine system and ammonium salt medicine system.
In a kind of possible design, the dewaterer is centrifugal dehydrator.
In a kind of possible design, the sea water nanofiltration desalination system further include: the water inlet with the nanofiltration device The sea water preprocessing device of connection, for suspended matter, colloidal solid and the organic matter in filtering sea.
In a kind of possible design, the sea water preprocessing device includes: filter tank and filter;
The filter tank, the filter, the nanofiltration device are sequentially connected to.
In a kind of possible design, the filter tank is flocculation sedimentation tank and/or V-type filter tank.
In a kind of possible design, the filter is in double medium filter, fine sand filter and membrane filters It is at least one.
The beneficial effect of technical solution provided by the embodiment of the utility model is: being connected by setting reactor and concentrated water outlet Logical, the concentrated water containing divalent and the above ion make nanofiltration device shut off under is delivered in reactor, the magnesium ion in concentrated water and Phosphate and ammonium salt reaction in reactor, generating ammonium magnesium phosphate etc. can be used as the crystal of fertilizer, direct so as to avoid concentrated water It is discharged into sea or will cause the wasting of resources for producing the lower Nacl of purity, be conducive to the comprehensive utilization of seawater, simultaneously Improve the surcharge of sea water nanofiltration desalination system.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings Obtain other attached drawings.
Fig. 1 is the first kind structural schematic diagram of sea water nanofiltration desalination system provided by the embodiment of the utility model;
Fig. 2 is the second class formation schematic diagram of sea water nanofiltration desalination system provided by the embodiment of the utility model.
Appended drawing reference in figure respectively indicates:
1- nanofiltration device;
2- desalter;
3- reactor;
4- dewaterer;
5- sea water preprocessing device;501- flocculation sedimentation tank;502-V type filter tank;503- ultrafiltration apparatus.
Specific embodiment
To keep the technical solution of the utility model and advantage clearer, the utility model is implemented below in conjunction with attached drawing Mode is described in further detail.
The utility model embodiment provides a kind of sea water nanofiltration desalination system, as shown in Figure 1, the system includes:
Nanofiltration device 1, nanofiltration device 1 have water inlet, output water out and concentrated water outlet;
With the desalter 2 of output water outlet;The sea water nanofiltration desalination system further include:
The reactor 3 of inlet and concentrated water outlet has phosphate and ammonium salt in reactor 3, for in concentrated water Magnesium ion reaction, generates ammonium magnesium phosphate;And
The dewaterer 4 being connected to the liquid outlet of reactor 3.
Sea water nanofiltration desalination system provided by the embodiment of the utility model, by the way that reactor 3 and concentrated water outlet is arranged, The concentrated water containing divalent and the above ion (such as magnesium ion) under making nanofiltration device 1 shut off is delivered in reactor 3, in concentrated water Magnesium ion in reactor 3 phosphate and ammonium salt react, generating ammonium magnesium phosphate etc. can be used as the crystal of fertilizer, to avoid Concentrated water is directly discharged to sea or will cause the wasting of resources for producing the lower Nacl of purity, is conducive to the synthesis of seawater It utilizes, while improving the surcharge of sea water nanofiltration desalination system.
In application, seawater to be processed is delivered in nanofiltration device 1 by water inlet, nanofiltration device 1 will be single in seawater Valence salt and high price salt (divalent and the above ion salt) are separated, isolate wherein the output water containing monovalention from output water Outlet discharge, continues to be delivered to desalter 2, for further preparing fresh water;And isolate containing divalent or more from Son concentrated water from concentrated water export be discharged, be transported to reactor 3, in reactor 3 phosphate and ammonium salt react, generation phosphoric acid Magnesium ammonium crystal, the mixed solution after crystallization are transported in dewaterer 4 from the liquid outlet of reactor 3, are obtained after the dehydration of dewaterer 4 It is able to ammonium magnesium phosphate solid slow-release fertilizer as main component;And dewatered filtrate because contain a large amount of ammonium ion or ammonium hydroxide, can It is canned to be used as liquid fertilizer.
In addition, Routine purges are utilized in the desalination system of the utility model compared with existing sea water nanofiltration desalination system Magnesium ion, produce high added value fertilizer, can effectively lower sea water desalination water producing cost.And seawater provided by the utility model Desalination system makes full use of the magnesium elements in nanofiltration concentrated water, prepare the phosphate fertilizer (main component is ammonium magnesium phosphate) of high added value, Liquid nitrogen fertilizer is produced simultaneously, utilizes the waste water generated after calcium magnesium element and the phosphate fertilizer dehydration in seawater to greatest extent.Estimate roughly It calculates, because of the economic benefit that this two parts fertilizer generates, 10% or more sea water desalination water producing cost can be reduced.
Preferably, for the moisture content of gained crystal 90% or more, selected dewaterer 4 can be with after the dehydration of dewaterer 4 For centrifugal dehydrator, or the dewaterer of vacuum hydroextractor or other forms.
In above-mentioned sea water nanofiltration desalination system, nanofiltration device 1 may include level-one nanofiltration device, while in order to further obtain Monovalention (sodium chloride salt) is taken, to improve the rate of recovery of Nacl in subsequent technique, also settable nanofiltration device 1 includes multistage Nanofiltration device, and multistage nanofiltration device includes the nano-filtration unit of multiple parallel connections.
When using level-one nanofiltration device, seawater to be processed is after the processing of level-one nanofiltration device, the output containing monovalention Water is transported to desalter 2, and the concentrated water containing divalent and the above ion is transported in reactor 3.
When using multistage nanofiltration device, seawater is after the processing of level-one nanofiltration device, the concentrated water quilt containing divalent and the above ion It is transported in next stage nanofiltration device, further separation unit price and high valence ion.
By taking nanofiltration device 1 includes second level nanofiltration device (having the first nano-filtration unit and the second nano-filtration unit) as an example, in application, Seawater to be processed is pumped into the first nano-filtration unit by high pressure cylinders, after the processing of the first nano-filtration unit, has removed divalent The output water gravity flow of ion enters desalter 2 (water inlet as desalter 2), and concentrated water gravity flow enters the second nano-filtration unit In;Concentrated water is further processed in the second nano-filtration unit, obtains the output water of the sodium chloride salt containing monovalention, the output Water gravity flow enters desalter 2 (water inlet as desalter 2), and treated that concentrated water enters reactor for the second nano-filtration unit 3, the charging as reactor 3.
Wherein, the rate of recovery of nanofiltration device 1 can reach 85%, and in other words, the ion of divalent or more is with receiving in seawater Concentrated water (15%) discharge of device 1 is filtered, the production water (85%) of nanofiltration device 1 then enters desalter 2.
In above-mentioned sea water nanofiltration desalination system, desalter 2 is for removing through treated the output water of nanofiltration device 1 In salinity, to output water carry out desalting, finally obtain fresh water.
Illustratively, which can be reverse osmosis unit, and reverse osmosis unit removes sodium chloride salt by reverse osmosis membrane Plasma.Wherein, in order to improve the rate of recovery of sea water desalination fresh water, which can be repeated several times, for example, by more A reverse osmosis unit series connection, carries out multiple desalting processing to seawater.
In application, the settable reverse osmosis unit include the cartridge filter being serially connected, reverse osmosis high-pressure pump, it is reverse osmosis Membrane component;The reverse osmosis unit may also include energy recycle device, chemicals dosing plant and cleaning device simultaneously, and wherein energy regenerating fills Set the energy for recycling high concentration water;Chemicals dosing plant is used to that antisludging agent and reducing agent to be added into reverse-osmosis membrane element, Prevent fouling and oxidation;Cleaning device is for cleaning reverse-osmosis membrane element.
Due to being provided with energy recycle device, and it is incorporated in the nanofiltration device 1 being arranged before reverse-osmosis membrane element, this is practical new Type embodiment can greatly reduce the operation power consumption of sea-water reverse osmose, to improve the economy of sea water desalination operation, estimate roughly It calculates, generated economic benefit can reduce by 25% or more sea water desalination water producing cost.
Sea water nanofiltration desalination system provided by the embodiment of the utility model, setting nanofiltration device 1 can be by divalent or more Ion isolation comes out, and reduces the probability of subsequent film device concentration fouling, improves the fresh-water recovery rate of subsequent sea-water reverse osmose, make The fresh-water recovery rate for obtaining sea-water reverse osmose apparatus can be mentioned by original (not using the seawater desalination system of nanofiltration device) about 40% Up to 67% or more;The strong brine main component handled simultaneously through desalter 2 is sodium chloride, can substantially reduce subsequent salt chemical engineering Salt refining workshop section of enterprise load, and then reduce chemical enterprises operating cost;And if sea water desalination water is larger, Strong brine also can be directly used for salt manufacturing, and the industrial purity salt produced also is much higher than regular seawater desalination and (does not use nanofiltration device Seawater desalination system) after concentrated water, so that the economic value of Nacl can be improved.
Wherein, using above-mentioned sea water nanofiltration desalination system, fresh-water recovery rate can be made to be greater than 67%, the effect of energy recycle device Rate is greater than 90%, and the salt rejection rate of desalter 2 is greater than 99%.
In above-mentioned sea water nanofiltration desalination system, reactor 3 is used to that magnesium ion etc. to be made to react with phosphate and ammonium salt, with Generate fertilizer.
Illustratively, settable reactor 3 includes phosphate medicine system and ammonium salt medicine system.Phosphate medicine system and Ammonium salt medicine system into reactor 3 for being added phosphate and ammonium salt according to a certain ratio.
Further, in order to promote reaction to carry out, also settable reactor 3 includes sodium hydroxide medicine system and plus ammonium hydroxide System, for addition sodium hydroxide and ammonium hydroxide to be conducive into reactor 3 with adjusting the PH of reaction solution according to a certain ratio Reaction carries out.
Further, in order to promote reaction to carry out, also settable reactor 3 includes self-circulating pump and blender, is followed certainly Ring pump and blender, so that the component in reactor 3 comes into full contact with, promote reaction for being uniformly mixed solution in reactor 3 Substance in device 3 is reacted.
In application, being delivered in reactor 3 after being collected from the concentrated water that nanofiltration device 1 is discharged, passing through phosphate dosing system System, ammonium salt medicine system, sodium hydroxide medicine system and ammonification water system added into reactor 3 phosphate centainly matched, It is available can to react to obtain ammonium magnesium phosphate etc. under the immixture of self-circulating pump and blender for ammonium salt, sodium hydroxide and ammonium hydroxide Make the crystal of fertilizer.
Generally, in the process of running, the pH of solution is adjustable to 7-9 in reactor 3, and blender is positively retained at 100- 200rpm。
In above-mentioned sea water nanofiltration desalination system, " seawater to be processed " into nanofiltration device 1 need to meet nanofiltration dress 1 influent quality requirement is set, subsequent nanofiltration membrane is blocked up to avoid the impurity dirt in seawater, influences its producing water ratio and producing water water quality.
Based on this, settable sea water nanofiltration desalination system further include: the seawater being connected to the water inlet of nanofiltration device 1 is pre- Processing unit 5.Sea water preprocessing device 5 for being pre-processed to seawater, with remove the suspended matter in seawater, colloidal solid and Organic matter makes pretreated seawater meet the influent quality requirement of nanofiltration device 1.
Illustratively, in a kind of possible embodiment, settable sea water preprocessing device 5 includes the filter tank of serial communication And filter;Filter tank, filter, nanofiltration device 1 are sequentially connected to.
In application, seawater is introduced into filter, delivery turbidity is made to be less than or equal to 10NTU, subsequently into filter into Row further filtering, to guarantee the pollution index (Silting Density Index, abbreviation SDI)≤5 of water outlet.
Wherein, filter tank can be one of flocculation sedimentation tank 501 or V-type filter tank 502;It is to be processed in order to further decrease The pollution index of seawater, also settable filter tank are flocculation sedimentation tank 501 and V-type filter tank 502.
When using flocculation sedimentation tank 501 and V-type filter tank 502, flocculation sedimentation tank 501 and V-type filter tank 502 need to be connected in series in In the sea water nanofiltration desalination system, and the water outlet in V-type filter tank 502 is connected to the water inlet of filter.
Similarly, filter can be one of double medium filters, fine sand filter and membrane filter;In order into one Step reduces the pollution index of seawater to be processed, and also settable filter is double medium filters, fine sand filter and membrane filter In two or more.
In alternatively possible embodiment, the filter tank of also settable sea water preprocessing device 5 including serial communication and Film filter, film filter can better ensure that the water quality of water outlet compared with filter.The film filter can be super Filter device 503.
Combined with specific embodiments below, the user of sea water nanofiltration desalination system provided by the utility model is further illustrated The beneficial effect of method and generation.
As shown in Fig. 2, seawater successively passes through flocculation sedimentation tank 501 and V-type filter tank 502 first, after filtering, delivery turbidity≤ 10NTU can then enter ultrafiltration apparatus 503, guarantee effluent quality SDI≤3, produce water and be temporarily stored into ultrafiltration pond, then use ultrafiltration Water pump is sent into nanofiltration device 1, and divalent ion exports discharge through the concentrated water of nanofiltration device 1, and the production water of nanofiltration device 1 enters desalination dress 2 (reverse osmosis equipments) are set, through reverse osmosis deaslination, adjustment water quality, fresh water is finally conveyed to user.The concentrated water of nanofiltration device 1 is sent into Phosphate, ammonium salt, ammonium hydroxide and the sodium hydroxide centainly matched is added in reactor 3, generates as main component slow with ammonium magnesium phosphate Fertilizer is released, the ammonium magnesium phosphate in concentrated water is separated from water using dewaterer 4 (centrifugal dehydrator), obtains solid crystals fertilizer, is dehydrated Because of the ammonium ion containing higher concentration in machine filter liquid, canned liquid fertilizer can be used as;It is anti-through the filtered seawater of reverse osmosis equipment Permeating concentrated water is mainly sodium chloride solution, can directly be utilized with being delivered to nearby alkali factory or salinization factory.
The above is merely for convenience of it will be understood by those skilled in the art that the technical solution of the utility model, not to Limit the utility model.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on, It should be included within the scope of protection of this utility model.

Claims (9)

1. a kind of sea water nanofiltration desalination system, comprising:
Nanofiltration device (1), the nanofiltration device (1) have water inlet, output water out and concentrated water outlet;
With the desalter (2) of the output water outlet;
It is characterized in that, the sea water nanofiltration desalination system further include:
The reactor (3) of inlet and the concentrated water outlet has phosphate and ammonium salt in the reactor (3), is used for It is reacted with magnesium ion in concentrated water, generates ammonium magnesium phosphate;And
The dewaterer (4) being connected to the liquid outlet of the reactor (3).
2. sea water nanofiltration desalination system according to claim 1, which is characterized in that the nanofiltration device (1) includes level-one Nanofiltration device or multistage nanofiltration device;
And the multistage nanofiltration device includes the nano-filtration unit of multiple parallel connections.
3. sea water nanofiltration desalination system according to claim 1, which is characterized in that the desalter (2) is reverse osmosis Equipment.
4. sea water nanofiltration desalination system according to claim 1, which is characterized in that the reactor (3) includes phosphate Medicine system and ammonium salt medicine system.
5. sea water nanofiltration desalination system according to claim 1, which is characterized in that the dewaterer (4) is centrifugal dehydration Machine or vacuum hydroextractor.
6. sea water nanofiltration desalination system according to claim 1, which is characterized in that the sea water nanofiltration desalination system is also wrapped It includes: the sea water preprocessing device (5) being connected to the water inlet of the nanofiltration device (1), for suspended matter, the glue in filtering sea Body particle and organic matter.
7. sea water nanofiltration desalination system according to claim 6, which is characterized in that sea water preprocessing device (5) packet It includes: filter tank and filter;
The filter tank, the filter, the nanofiltration device (1) are sequentially connected to.
8. sea water nanofiltration desalination system according to claim 7, which is characterized in that the filter tank is flocculation sedimentation tank (501) and/or V-type filter tank (502).
9. sea water nanofiltration desalination system according to claim 7, which is characterized in that the filter is double media filtrations At least one of device, fine sand filter and membrane filter.
CN201820334550.0U 2018-03-12 2018-03-12 A kind of sea water nanofiltration desalination system Active CN208345913U (en)

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CN201820334550.0U CN208345913U (en) 2018-03-12 2018-03-12 A kind of sea water nanofiltration desalination system

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