CN102476868A - Sea water desalination device capable of providing fresh water for coastal and island areas - Google Patents
Sea water desalination device capable of providing fresh water for coastal and island areas Download PDFInfo
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- CN102476868A CN102476868A CN2010105583215A CN201010558321A CN102476868A CN 102476868 A CN102476868 A CN 102476868A CN 2010105583215 A CN2010105583215 A CN 2010105583215A CN 201010558321 A CN201010558321 A CN 201010558321A CN 102476868 A CN102476868 A CN 102476868A
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Abstract
The invention relates to a sea water desalination device capable of providing fresh water for coastal and island areas, belonging to the technical field of sea water desalination. The device, with double-stage nanofiltration as core, sequentially comprises a raw water tank, a raw water pump, a multimedium filter, an ultrafiltration membrane, a first-stage nanofiltration pump, a first-stage nanofiltration membrane, a second-stage nanofiltration pump, a second-stage nanofiltration membrane, and a water producing tank. The water pump provides power required for operation of the whole working process. The work flow of the device is shown as follows: sea water;raw water tank;raw water pump multi-media;filter;ultrafiltration membrane;first-stage nanofiltration pump;first-stage nanofiltration membrane;second-stage nanofiltration pump;second-stage nanofiltration membrane-water producing tank;fresh water. Advantages of the invention include low energy consumption, low operation pressure, high recovery of produced water, good desalination treatment effects and stable system operation.
Description
Technical field
The invention belongs to field of sea water desalting technology, be applicable to that Freshwater resources lack the coastal and island is regional can be the locality fresh water is provided.
Background technology
Water resources becomes the global strategy resource day by day, and human development is all closely related with water resources with progressive population expansion, shortage of resources and the environmental degradation three big problems that faced.The water resources in china total amount is 28,124 hundred million tons; Occupy the 6th in the world; But in 1/4,660 big and medium-sized cities of the not enough world occupancy volume per person of Freshwater resources occupancy volume 400 urban water shortages are arranged per capita, wherein 108 city serious water shortages; Add serious uneven, the increasing environmental pollution of spatial and temporal distributions, cause water shortage problem to make the matter worse.It is predicted; China's water resource of per capita has only 1750 tons about the year two thousand thirty, and industrial water deficit will reach more than 60,000,000,000 tons, estimates the water consumption upper limit of the approaching water yield capable of using; To get into serious water shortage country ranks; If do not take effective measures, develop new water resources, serious water crisis might appear in future in China.
Tellurian gross amount of water resources, fresh water only account for 2.5%, and seawater accounts for 97.5%, and utilizing seawater is one of important measures that solve China's water resources crisis.Wanting water to the sea is the Real Choice that solves regional shortage of fresh waters such as coastal (coastal waters) and island; Also be to realize sustainable utilization of water resource; Ensure the vital measure of regional economy social sustainable developments such as coastal and island, be of great immediate significance and strategic importance.Sea water desaltination promptly utilizes sea water desalinization to produce fresh water, can increase the fresh water total amount, and not receive space-time and weather effect, and water quality is good, price is gradually reasonable.Used method for desalting seawater has seawater freezing method, electroosmose process, distillation method, r-o-and Nanofiltering membrane now; At present Nanofiltering membrane simple with its equipment, be easy to safeguard and the advantage of EM equipment moduleization dominates the market rapidly; The twin-stage nanofiltration is new desalination technology, has advantages such as energy consumption is little, cost is low, the product water recovery is high, pollution-free, and the miniaturized of implement device easily; Be specially adapted to the areas such as coastal and island that Freshwater resources lack, can be the locality fresh water is provided.
Summary of the invention
The purpose of this invention is to provide that a kind of working pressure is low, energy consumption is low, produce that the water recovery is high, processing efficiency is high and portable twin-stage nano filtering process sea water distiling plant.
The present invention is a kind of to be can be coastal and the regional sea water distiling plant that fresh water is provided in island; Include water tank, raw water pump, more medium filter, ultra-filtration membrane, nanofiltration pump, nf membrane etc., it is characterized in that: the raw water box bottom water outlet that seawater is housed links to each other with the water-in of raw water pump through pipeline; The water outlet of said raw water pump links to each other with the water-in of a plurality of mass filters through pipeline; The water outlet of said more medium filter links to each other with the water-in of ultra-filtration membrane through pipeline; The product mouth of a river of said ultra-filtration membrane links to each other with the water-in of one-level nanofiltration pump through pipeline; The water outlet of said one-level nanofiltration pump links to each other with the water-in of one-level nf membrane through pipeline; The concentrated water spout of said one-level nf membrane links to each other with raw water box top water-in through dense waterpipe, and the product mouth of a river of one-level nf membrane links to each other with the water-in of secondary nanofiltration pump through the water producing pipe road; The water outlet of said secondary nanofiltration pump links to each other with the water-in of secondary nf membrane through pipeline; The concentrated water spout of said secondary nf membrane links to each other with the product mouth of a river of one-level nf membrane through dense waterpipe, and the product mouth of a river of secondary nf membrane links to each other with product tank top water-in through the water producing pipe road, and fresh water can flow out from the bottom water outlet that produces water tank.It is 2 that described one-level nf membrane is provided with quantity, and it is 1 that the secondary nf membrane is provided with quantity.
The present invention is a kind of to be can be coastal and the regional principle of work of the sea water distiling plant of fresh water that provides in island is described below: at first use more medium filter and ultra-filtration membrane that seawater is carried out pre-treatment; Provide system to move needed WP with raw water pump; Remove suspended substance, mikrobe, small-particle and suspended substance colloid in the seawater, prevent of pollution and the obstruction of these materials nf membrane; Can reach the water inlet requirement of nf membrane through said pretreated seawater; Seawater gets into first step nanofiltration pump; The nanofiltration pump provides nf membrane work needed pressure, carries out the nf membrane desalting first time, removes divalent ions such as most calcium ion, mg ion and sulfate ion in the seawater; Monovalent ions such as sodium ion, cl ions also there is very high decreasing ratio; The ion that is removed can be back to raw water box from the concentrated water spout of nf membrane with dense water, and the desalination water of output flows out from the product mouth of a river of nf membrane, gets into second stage nanofiltration pump through piping; Said second stage nanofiltration pump is sent into second stage nf membrane after water is pressurizeed; Carry out nanofiltration second time desalting; Can the divalent ion in the seawater be removed basically fully specifically, also more than 99%, the ion that is removed is with the product mouth of a river of concentrate recirculation to first step nf membrane to the decreasing ratio of monovalent ion; Fresh water flows out entering product water tank in the nf membrane product mouth of a river from the second stage, is product water.
The present invention is a kind of to be can be coastal and the regional advantage and the characteristics of the sea water distiling plant of fresh water of providing in island are described below: WP is low when operation, unit fresh water yield energy consumption is low for the native system device, produce water recovery height and processing efficiency is high; Adopting the twin-stage nanofiltration is the desalting core; Not only desalting effect is not second to reverse osmosis technology, and required WP also reduces more than 2/3rds than r-o-, and energy consumption is also little than r-o-; Required pump performance and pipeline specification are high less than reverse osmosis technology, and therefore overall cost is low; Said more medium filter, ultra-filtration membrane, nf membrane and water pump all have the less model of volume, can realize the miniaturized and the portability of total system, are particularly suitable for being applied to Freshwater resources shortage areas such as island.
Description of drawings
Fig. 1 can be coastal and the regional workflow diagram that the sea water distiling plant of fresh water is provided in island for the present invention is a kind of.
Embodiment
After existing specific embodiment with system and device of the present invention is described in.Example is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.
Embodiment one: referring to Fig. 1, Fig. 1 can be coastal and the regional workflow diagram that the sea water distiling plant of fresh water is provided in island for this instance is a kind of.The native system device includes water tank, raw water pump, more medium filter, ultra-filtration membrane, nanofiltration pump, nf membrane etc., and accessory components commonly used such as under meter, tensimeter, valve.The raw water box bottom water outlet that seawater is housed links to each other with the water-in of raw water pump through pipeline; The water outlet of said raw water pump links to each other with the water-in of more medium filter through pipeline; The water outlet of said more medium filter links to each other with the water-in of ultra-filtration membrane through pipeline; The product mouth of a river of said ultra-filtration membrane links to each other with the water-in of one-level nanofiltration pump through pipeline; The water outlet of said one-level nanofiltration pump links to each other with the water-in of one-level nf membrane through pipeline; The concentrated water spout of said one-level nf membrane links to each other with raw water box top water-in through dense waterpipe, and the product mouth of a river of one-level nf membrane links to each other with the water-in of secondary nanofiltration pump through the water producing pipe road; The water outlet of said secondary nanofiltration pump links to each other with the water-in of secondary nf membrane through pipeline; The concentrated water spout of said secondary nf membrane links to each other with the product mouth of a river of one-level nf membrane through dense waterpipe, and the product mouth of a river of secondary nf membrane links to each other with product tank top water-in through the water producing pipe road, and fresh water can flow out from the bottom water outlet that produces water tank.
Present embodiment is a kind of to be can be coastal and the regional operation of the sea water distiling plant of fresh water that provides in island is described below:
(1) preprocessing process: provide system to move needed WP with raw water pump; Make seawater successively through more medium filter and ultra-filtration membrane; Remove suspended substance, mikrobe, small-particle and suspended substance colloid in the seawater, prevent of pollution and the obstruction of these materials nf membrane;
(2) twin-stage nanofiltration demineralising process: can reach the water inlet requirement of nf membrane through above-mentioned pretreated seawater; Seawater gets into first step nanofiltration pump; The nanofiltration pump provides nf membrane work needed pressure, carries out the nf membrane desalting first time, removes divalent ions such as most calcium ion, mg ion and sulfate ion in the seawater; Monovalent ions such as sodium ion, cl ions also there is very high decreasing ratio; The ion that is removed can be back to raw water box from the concentrated water spout of nf membrane with dense water, and the desalination water of output flows out from the product mouth of a river of nf membrane, gets into second stage nanofiltration pump through piping; Said second stage nanofiltration pump is sent into second stage nf membrane after water is pressurizeed; Carry out nanofiltration second time desalting; Can the divalent ion in the seawater be removed basically fully specifically, also more than 99%, the ion that is removed is with the product mouth of a river of concentrate recirculation to first step nf membrane to the decreasing ratio of monovalent ion; Fresh water flows out entering product water tank in the nf membrane product mouth of a river from the second stage, is product water.
In the present embodiment; Adopt the seawater of saltiness 35000mg/L to make the desalination test run(s), each parameter is following: the working pressure of more medium filter and ultra-filtration membrane is 0.2MPa, the delivery turbidity＜0.5NTU of ultra-filtration membrane; SDI＜3; The working pressure of one-level nf membrane is 1.0MPa, and the working pressure of secondary nf membrane is 0.7MPa, and it is that the saltiness of fresh water is less than 200mg/L that the secondary nf membrane is produced water.
Claims (2)
1. one kind can be coastal and the regional sea water distiling plant that fresh water is provided in island; Comprise water tank, raw water pump, more medium filter, ultra-filtration membrane, nanofiltration pump, nf membrane etc., it is characterized in that: the raw water box bottom water outlet that seawater is housed links to each other with the water-in of raw water pump through pipeline; The water outlet of said raw water pump links to each other with the water-in of more medium filter through pipeline; The water outlet of said more medium filter links to each other with the water-in of ultra-filtration membrane through pipeline; The product mouth of a river of said ultra-filtration membrane links to each other with the water-in of one-level nanofiltration pump through pipeline; The water outlet of said one-level nanofiltration pump links to each other with the water-in of one-level nf membrane through pipeline; The concentrated water spout of said one-level nf membrane links to each other with raw water box top water-in through dense waterpipe, and the product mouth of a river of one-level nf membrane links to each other with the water-in of secondary nanofiltration pump through the water producing pipe road; The water outlet of said secondary nanofiltration pump links to each other with the water-in of secondary nf membrane through pipeline; The concentrated water spout of said secondary nf membrane links to each other with the product mouth of a river of one-level nf membrane through dense waterpipe, and the product mouth of a river of secondary nf membrane links to each other with product tank top water-in through the water producing pipe road, and fresh water can flow out from the bottom water outlet that produces water tank.
2. as claimed in claim 1ly a kind ofly can be coastal and the regional sea water distiling plant that fresh water is provided in island, it is characterized in that it is 2 that described one-level nf membrane is provided with quantity, it is 1 that the secondary nf membrane is provided with quantity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105583215A CN102476868A (en) | 2010-11-24 | 2010-11-24 | Sea water desalination device capable of providing fresh water for coastal and island areas |
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| CN2010105583215A CN102476868A (en) | 2010-11-24 | 2010-11-24 | Sea water desalination device capable of providing fresh water for coastal and island areas |
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| CN102476868A true CN102476868A (en) | 2012-05-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102701504A (en) * | 2012-06-18 | 2012-10-03 | 中国海洋大学 | Method for preparing polymer solution for oil displacement of oil field |
| CN106115992A (en) * | 2016-08-25 | 2016-11-16 | 刘永锋 | A kind of electrodialytic desalination device |
| CN110078272A (en) * | 2019-05-20 | 2019-08-02 | 浙江天行健水务有限公司 | Concentrated seawater recycles chlorine method processed |
-
2010
- 2010-11-24 CN CN2010105583215A patent/CN102476868A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102701504A (en) * | 2012-06-18 | 2012-10-03 | 中国海洋大学 | Method for preparing polymer solution for oil displacement of oil field |
| CN106115992A (en) * | 2016-08-25 | 2016-11-16 | 刘永锋 | A kind of electrodialytic desalination device |
| CN110078272A (en) * | 2019-05-20 | 2019-08-02 | 浙江天行健水务有限公司 | Concentrated seawater recycles chlorine method processed |
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Application publication date: 20120530 |