Method for removing calcium in brine through ultrasonic treatment

An ultrasonic treatment, ultrasonic technology, applied in the direction of water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of reducing the time and cost of subsequent descaling operations, and the surface of membrane or evaporation equipment is prone to condensation. Scale and other problems, to achieve the effect of improving the desalination water production rate, extending the service life of equipment, and protecting the environment

Inactive Publication Date: 2016-09-21
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the actual problem that the surface of the membrane or evaporation equipment used for desalination is easy to scale during the desalination process of brine with high concentration at present, and reduce the operation time and cost of subsequent descaling. Method for removing calcium ions in brine system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Natural seawater (containing Na + 11.93g / L, Mg 2+ 1.22g / L, Ca 2+ 0.39g / L, K + 0.38g / L,Sr + 0.01g / L) after being treated by a polyether ultrafiltration membrane with a molecular weight of 50,000, it enters a reverse osmosis coiled polyamide membrane, and desalination is carried out at 5Mpa to obtain a pH of brine=6.9 (containing Na + 59.7g / L, Mg 2+ 6.1g / L, Ca 2+ 1.95g / L, K + 1.9g / L,Sr + 0.04g / L); then, the flow rate is 1.5m 3 The brine (concentrated seawater) of / h is transported to the pipeline equipped with ultrasonic probes, the inner diameter of the pipeline is 20 cm, and the interval between every two probes is 40 cm, placed in sequence along the pipeline, a total of 60 (keep the brine in The dwell time under ultrasound is 30 minutes). The end diameter of the ultrasonic probe used is 6 mm, and the parameters of the ultrasonic treatment are set to an average power density of 2000 W / m 3 , Frequency 50kHz, ultrasonic mode of action is continuous. Get export ...

Embodiment 2

[0031]Natural seawater (containing Na + 11.93g / L, Mg 2+ 1.22g / L, Ca 2+ 0.39g / L, K + 0.38g / L,Sr + 0.01g / L) after ultrafiltration, after being treated with a polyether ultrafiltration membrane with a molecular weight of 50,000, it enters the first-stage reverse osmosis roll-type polyamide membrane for desalination at 7Mpa to obtain a pH of brine=7.1 (containing Na + 71.6g / L, Mg 2+ 7.3g / L, Ca 2+ 2.33g / L, K + 2.3g / L,Sr + 0.05g / L); then, the flow rate is 1.5m 3 / h of concentrated seawater (brine) enters and is transported to the pipeline equipped with ultrasonic decalcification probes, the inner diameter of the pipeline is 10 cm, and the interval between every two probes is 20 cm, placed in sequence along the pipeline, a total of 80 ( Keep the brine under ultrasound for a residence time of 5 min). The diameter of the end of the ultrasonic probe used is 10 mm, and the parameters of the ultrasonic treatment are set to an average power density of 1500 W / m 3 , Frequency 20kHz...

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Abstract

The invention relates to a method for removing calcium in brine through ultrasonic treatment. The method comprises the following steps: conveying the brine to a pipeline equipped with an ultrasonic decalcification probe, wherein the action mode of ultrasound is continuous and the dwell time is 1-30 minutes; enabling the decalcified brine to enter an online micro-filtration membrane filter on the pipeline after ultrasonic treatment, and filtering a calcium salt solid to finally obtain the decalcified brine; wherein the inner diameter of the pipeline provided with the ultrasonic decalcification probe is 5-20cm, the diameter of the tail end of the ultrasonic probe is 1-10mm, the parameter of the ultrasonic treatment is set that the power density is 500-5000W/m<3>, and the frequency is 10-100kHz. The ultrasonic treatment method is used to promote nucleation of a main scale-forming ion, precipitate, filter and remove crystals like calcium carbonate and calcium sulfate. The decalcified heavy salt water further returns to a desalination unit to improve the concentration rate, so as to finally improve the water production rate.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for removing calcium in brine by using ultrasonic technology, and belongs to the technical field of international patent classification C02F1 / 100 "treatment of water, waste water and sewage". Background technique [0002] With rapid economic development, rapid population growth and huge consumption of resources, the shortage of fresh water resources has become an important factor restricting social and economic development. The water resources in seawater account for about 96.5% of the global water reserves. Seawater desalination has become a strategic way to solve the water crisis, and its effectiveness and reliability have been more and more widely recognized. [0003] At present, the main technologies for seawater desalination are distillation and membrane, but the total water production rate is only about 50%. Due to the presence of a large number of insoluble salt io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/36C02F1/44C02F101/10
CPCY02A20/131C02F1/36C02F1/444C02F2101/10
Inventor 苏敏陈建新李银辉卢爱党韩建
Owner HEBEI UNIV OF TECH
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