Coagulating removing method of calcium sulfate fouling in reverse osmosis concentrated liquid

A technology of reverse osmosis concentrate and calcium sulfate, which is applied in the direction of osmosis/dialysis water/sewage treatment, flocculation/sedimentation water/sewage treatment, complex/solubilizer treatment, etc., and can solve problems such as unusable and scaling. Achieve low cost, increase recovery rate, and environmental friendliness

Inactive Publication Date: 2007-03-14
浙江凯锐环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason why the concentrate has not been reused is because it contains high scaling salts, and some contain CaCO 3 Scaling salts are more like Ca 2+ 、HCO 3 - High content; some contain CaSO 4 Scaling salts are more like Ca 2+ , SO 4 2- The concentration of scale-forming ions is high, with a large CaSO 4 Fouling tendency, that is, higher supersaturation index SI, prone to fouling and cannot continue to be utilized

Method used

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  • Coagulating removing method of calcium sulfate fouling in reverse osmosis concentrated liquid
  • Coagulating removing method of calcium sulfate fouling in reverse osmosis concentrated liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Simulate the composition of a reverse osmosis concentrate to configure the solution, weigh NaCl, Na 2 SO 4 , CaCl 2 Mix with distilled water, put it in a 1L beaker, and add 25mg / L commercial scale inhibitor A (product of Shandong Zibo Libang Fine Chemical Co., Ltd. LB2000) to make 800ml concentrated solution, of which Ca 2+ =3250mg / L, SO 4 2 -=6300mg / L, Na + =6007mg / L, Cl - = 10352mg / L. The temperature of the concentrate is 30°C, and its initial saturation index SI is 4.4.

[0018] Then 60mg / L aluminum sulfate was added for coagulation, coagulation was performed at 300 revolutions / min for half a minute, and then coagulation was performed at 50 revolutions / min for 40 minutes. During the coagulation reaction, the calcium ion concentration of the solution is measured at regular intervals. Then the calcium ion concentration is normalized, and the measured calcium ion concentration Ca i Are divided by the initial calcium ion concentration Ca 0 , And then make Ca i / Ca 0 Curve o...

Embodiment 2

[0023] In this example, the type of scale inhibitor was changed to commercial scale inhibitor B (product LB0100 of Shandong Zibo Libang Fine Chemical Co., Ltd.) for experimentation.

[0024] Simulate the composition of a reverse osmosis concentrate to configure the solution, weigh NaCl, Na 2 SO 4 , CaCl 2 Mix with distilled water, put into a 1L beaker, and add 25mg / L commercial scale inhibitor B to make 800ml concentrated solution, of which Ca 2+ =3250mg / L, SO 4 2- =6300mg / L, Na + =6007mg / L, Cl - = 10352mg / L. The temperature of the concentrate is 30°C, and its initial saturation index SI is 4.4.

[0025] Then 60mg / L aluminum sulfate was added for coagulation, coagulation was performed at 300 revolutions / min for half a minute, and then coagulation was performed at 50 revolutions / min for 40 minutes. During the coagulation reaction, the calcium ion concentration of the solution is measured at regular intervals. Then the calcium ion concentration is normalized, and the measured calci...

Embodiment 3

[0029] In this example, the type of scale inhibitor was changed to commercial scale inhibitor C (chemical sodium hexametaphosphate) for experimentation.

[0030] Simulate the composition of a reverse osmosis concentrate to configure the solution, weigh NaCl, Na 2 SO 4 , CaCl 2 Mix with distilled water, put it in a 1L beaker, add 25mg / L commercial scale inhibitor C to make 800ml concentrated solution, of which Ca 2+ =3250mg / L, SO 4 2- =6300mg / L, Na +=6007mg / L, Cl - = 10352mg / L. The temperature of the concentrate is 30°C, and its initial saturation index SI is 4.4.

[0031] Then 60mg / L aluminum sulfate was added for coagulation, coagulation was performed at 300 revolutions / min for half a minute, and then coagulation was performed at 50 revolutions / min for 40 minutes. During the coagulation reaction, the calcium ion concentration of the solution is measured at regular intervals. Then the calcium ion concentration is normalized, and the measured calcium ion concentration Ca i Are div...

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Abstract

The present invention relates to waste water treating technology, and is especially the method of eliminating scaled calcium sulfate salt in reverse osmosis concentrate. Coagulant capable of coagulating the nanometer particle formed by scaling ions Ca2+ and SO42- in the concentrate is used in treating the reverse osmosis concentrate to deposit oversaturated scaling ions. The deposit is then eliminated through filtering, and the concentrate with less scaling may be reused in the reverse osmosis, reaching raised water recovering rate of the reverse osmosis system. The present invention has aluminum sulfate used as the coagulant, low treating cost, environment friendship and raised water recovering rate.

Description

Technical field [0001] The invention relates to a method in the technical field of wastewater treatment, in particular to a coagulation removal method of calcium sulfate scale salt in reverse osmosis concentrated liquid. Background technique [0002] Reverse osmosis (RO) desalination is widely used in industrial fields such as brackish water and seawater desalination, pharmaceutical production, high-purity water in the electronics industry, beverage water, and chemical production. Compared with distillation desalination, reverse osmosis has outstanding advantages such as low energy consumption, simple operation and operation, no regeneration waste liquid discharge, small system area, and economic operation cost. With the improvement of membrane technology, the development of energy recovery system, the improvement of pretreatment technology and the wide applicability of high and low salinity influent, the cost of reverse osmosis desalination has been significantly reduced year by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F5/08C02F1/44
Inventor 杨庆峰
Owner 浙江凯锐环保股份有限公司
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