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 directions of osmosis/dialysis water/sewage treatment, flocculation/sedimentation water/sewage treatment, complex/solubilizer treatment, etc., and can solve problems such as scaling and unusability. Achieve low cost, improve recovery rate, and low cost

Inactive Publication Date: 2008-09-03
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 Add distilled water and mix, put into 1L beaker, and add 25mg / L commercial antiscalant A (the product LB2000 of Shandong Zibo Libang Fine Chemical Co., Ltd.), make 800ml concentrated liquid, wherein Ca 2+ =3250mg / L, SO 4 2- =6300mg / L, Na + =6007mg / L, Cl - =10352 mg / L. The temperature of the concentrate is 30°C, and its initial saturation index SI is 4.4.

[0018] Then add 60 mg / L aluminum sulfate for coagulation, carry out coagulation for half a minute at 300 rpm, and then coagulate for 40 minutes at 50 rpm. During the coagulation reaction, the calcium ion concentration of the solution was measured at regular intervals. Then the calcium ion concentration is normalized, that is, the measured calcium ion concentration Ca 1 are divided by the initial calcium ion concentration Ca 0 , then make Ca 1 / Ca 0 Variation curve over time.

[0019] Change ...

Embodiment 2

[0023] In this example, the type of scale inhibitor was changed to commercial scale inhibitor B (the 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 Add distilled water to mix, put it into a 1L beaker, and add 25mg / L commercial antiscalant B to make 800ml concentrated solution, in which Ca 2+ =3250mg / L, SO 4 2- =6300mg / L, Na + =6007mg / L, Cl - =10352 mg / L. The temperature of the concentrate is 30°C, and its initial saturation index SI is 4.4.

[0025] Then add 60 mg / L aluminum sulfate for coagulation, carry out coagulation for half a minute at 300 rpm, and then coagulate for 40 minutes at 50 rpm. During the coagulation reaction, the calcium ion concentration of the solution was measured at regular intervals. Then the calcium ion concentration is normalized, that is, the measured calcium ion concentration Ca 1...

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 Add distilled water and mix, put it into a 1L beaker, add 25mg / L commercial antiscalant C to make 800ml concentrated solution, in which Ca 2+=3250mg / L, SO 4 2- =6300mg / L, Na + =6007mg / L, Cl - =10352 mg / L. The temperature of the concentrate is 30°C, and its initial saturation index SI is 4.4.

[0031] Then add 60 mg / L aluminum sulfate for coagulation, carry out coagulation for half a minute at 300 rpm, and then coagulate for 40 minutes at 50 rpm. During the coagulation reaction, the calcium ion concentration of the solution was measured at regular intervals. Then the calcium ion concentration is normalized, that is, the measured calcium ion concentration Ca 1 are divided by the initial calcium i...

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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 method for coagulating and removing calcium sulfate scaling salts in a reverse osmosis concentrated solution. Background technique [0002] Reverse osmosis (RO) desalination is widely used in brackish water and seawater desalination, pharmaceutical production, high-purity water in the electronics industry, drinking water, chemical production and other industrial fields. Compared with distillation desalination, reverse osmosis has outstanding advantages such as low energy consumption, simple operation, no regeneration waste liquid discharge, small system footprint, and economical operating costs. 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 feed water, the cost of reverse osmosis desalination has decreased year by year...

Claims

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Application Information

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Patent Type & Authority Patents(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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