Seawater desalination device and method thereof

A seawater and freshwater technology, applied in chemical instruments and methods, seawater treatment, separation methods, etc., can solve the problems of high membrane dependence, low efficiency, uneconomical, etc., and achieve the simplification of the pretreatment process and the reduction of sludge Amount of generation, effect to reduce environmental pollution

Inactive Publication Date: 2013-12-18
BOYING XIAMEN SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

These methods are either inefficient or consume a lot of energy and are uneconomical.
Among these methods, the reverse osmosis method has achieved great technological progress after decades of development. Its advantages are high efficiency of seawater desalination, and its scale can be customized according to needs, and its production capacity is large; but its disadvantages The disadvantages are also prominent: First, the cost is high. If single-stage reverse osmosis desalination is used, the boron and bromide in the product (desalinated water) will exceed the standard, which does not meet the GB5749-2006 "Drinking Water Hygienic Standards" and cannot be used as drinking water; if It adopts two-stage or multi-stage reverse osmosis desalination. Although the product (desalinated water) can meet GB5749-2006 "Drinking Water Sanitation Standard", the production cost is relatively high
Second, large energy consumption (generally greater than 3KWh / m 3 , mostly at 4~4.5KWh / m 3 )
The third is that it relies heavily on the membrane and has a short lifespan (generally about 2 years). It needs to replace the membrane module regularly, which is still unsatisfactory in terms of cost-effectiveness.
Fourth, the requirements for pretreatment are high. The commonly used reverse osmosis membrane technology adopts the addition of flocculant for pretreatment, which not only increases the cost, but also adds new chemical substances, thus causing the risk of secondary chemical pollution.

Method used

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  • Seawater desalination device and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 600 tons / day seawater desalination project.

[0042] The water quality of the seawater is shown in Table 1.

[0043] Table 1 Untreated seawater quality indicators

[0044] serial number project Index serial number project Index 1 smelly and smelly No smell 5 COD (mg / L) 10 2 pH 8.0 6 Ammonia nitrogen (mg / L) 0.3 3 SS (mg / L) 16 7 Algae (unit / L) 1.9×10 2 4 Turbidity / NTU 4.0 8 Total number of bacteria (pcs / L) 5.4×10 3

[0045] Step 1, electrolysis: start the water supply pump 12, and the seawater is 3 The flow rate of / h passes through the stop valve 11 and enters the electrolysis machine 13 for electrolysis to kill microorganisms such as plankton, bacteria and viruses in seawater, and then through sedimentation and microfiltration to remove microbial corpses, suspended solids and colloidal substances, and obtain purification. seawater. The electrolysis is nano-catalyzed electrolysis, the voltage betwe...

Embodiment 2

[0053] 1500 tons / day seawater desalination project.

[0054] The water quality of the seawater is shown in Table 3.

[0055] Table 3 Untreated seawater quality indicators

[0056] serial number project Index serial number project Index 1 smelly and smelly No smell 5 COD (mg / L) 8 2 pH 8.1 6 Ammonia nitrogen (mg / L) 0.5 3 SS (mg / L) 20 7 Algae (unit / L) 1.1×10 2 4 Turbidity / NTU 3.5 8 Total number of bacteria (pcs / L) 3.6×10 3

[0057] Step 1, electrolysis: start the water supply pump 12, and the seawater is 3 The flow rate of / h passes through the stop valve 11 and enters the electrolysis machine 13 for electrolysis to kill microorganisms such as plankton, bacteria and viruses in seawater, and then through sedimentation and microfiltration to remove microbial corpses, suspended solids and colloidal substances, and obtain purification. seawater. The electrolysis is nano-catalytic electrolysis, the voltage betwe...

Embodiment 3

[0065] 4000 tons / day seawater desalination project.

[0066] The water quality of the seawater is shown in Table 5.

[0067] Table 5 Untreated seawater quality indicators

[0068] serial number project Index serial number project Index 1 smelly and smelly No smell 5 COD (mg / L) 14 2 pH 8.0 6 Ammonia nitrogen (mg / L) 0.9 3 SS (mg / L) 19 7 Algae (unit / L) 2.3×10 2 4 Turbidity / NTU 4.7 8 Total number of bacteria (pcs / L) 8.5×10 3

[0069] Step 1, electrolysis: start the water supply pump 12, and the seawater is 3 The flow rate of / h passes through the stop valve 11 and enters the electrolysis machine 13 for electrolysis to kill microorganisms such as plankton, bacteria and viruses in seawater, and then through sedimentation and microfiltration to remove microbial corpses, suspended solids and colloidal substances, and obtain purification. seawater. The voltage between the two electrodes of the electrolysis is 2-1...

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Abstract

A seawater desalination device and method thereof, relating to a seawater device and method thereof that use a combination of an electrolysis technique, a capacitive adsorption de-ionization technique, and a low-pressure reverse osmosis technique. The device is disposed with an electrolytic purification system, a capacitive adsorption de-ionization system, and a low-pressure reverse osmosis system. The electrolytic purification system has a stop valve, a water supply pump, an electrolysis machine, a sedimentation tank, and a micro-filtration device; the capacitive adsorption de-ionization system has a stop valve, a lifting pump, a safety filter, a water supply pump, a capacitive adsorption de-ionization device, a preliminary freshwater storage tank, and a concentrated water booster pump; the low pressure reverse osmosis system has a stop valve, a water supply pump, a safety filter, a high pressure pump, a low pressure reverse osmosis membrane assembly, and a freshwater storage tank. First, performing electrolysis, then performing capacitive adsorption de-ionization to preliminarily remove salt, and finally performing low pressure reverse osmosis to remove salt. The process is short, requires small investments, and has little environmental pollution. The reverse osmosis system has low requirements for material, is cheap, and addresses the domestic production problem. The invention is easy to operate, uses little energy, and has high desalination efficiency, low manufacturing costs, a high concentration of apparatuses, and a small volume.

Description

technical field [0001] The invention relates to a seawater desalination device and a method thereof, in particular to a seawater device and a method thereof combining electrolysis technology, capacitive adsorption deionization technology and low-pressure reverse osmosis technology. Background technique [0002] The total global water storage is 1.386 billion km 3 , seawater accounts for 96.5%, and the surface fresh water and shallow underground fresh water available to humans are only 0.79%, and the distribution is extremely uneven with geographical and seasonal changes. The shortage of fresh water resources has become one of the three major environmental problems in the 21st century. Asking for water and resources from the sea is a realistic choice to solve the shortage of fresh water resources in coastal (offshore) areas, and it is also a major measure to realize sustainable utilization of water resources and ensure sustainable economic and social development in coastal a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/461C02F1/469C02F1/44C02F103/08
CPCC02F1/461C02F1/469C02F1/44C02F9/00C02F1/441C02F1/444C02F1/463C02F1/4674C02F1/4691C02F2001/46142C02F2103/08Y02A20/131
Inventor 张世文宁鹏秦婧
Owner BOYING XIAMEN SCI & TECH
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