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E-Fenton oxidation technique of dirty blocking agent in reverse osmosis concentrating liquid

A technology of reverse osmosis concentrate and antiscalant, which is applied in the direction of chemical instruments and methods, reverse osmosis, osmosis/dialysis water/sewage treatment, etc., can solve the problems such as unusable, improve the water recovery rate of the reverse osmosis system, Strong oxidation and fast effect

Inactive Publication Date: 2004-11-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concentrate contains higher salt content, especially Ca 2+ , Mg 2+ 、HCO 3 - The concentration of other scale-forming ions is high, and it has a greater tendency to scale, that is, a higher LSI value (Langelier Saturation Index), which is easy to scale and cannot continue to be used

Method used

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  • E-Fenton oxidation technique of dirty blocking agent in reverse osmosis concentrating liquid
  • E-Fenton oxidation technique of dirty blocking agent in reverse osmosis concentrating liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh out 0.72 g of NaHCO 3 , 1.18 g CaCl 2 , 0.22 g MgSO 4 ·7H 2 O, 0.228 g NaNO 3 , placed in 800 ml of distilled water to prepare a concentrated solution with an initial pH of 7.8 and an initial LSI 0 is 1.86. Add scale inhibitor, and the concentration of scale inhibitor is 7mg / L.

[0019] Electrolytic anode is made of iron plate, cathode is made of porous graphite, and the area of ​​both electrodes is 45cm 2 . The cathode is ventilated by an air pump, and the air flow is 0.12m 3 / h, the electrolysis voltage was 5V, the time was 30 minutes, and the solution was electrolyzed under stirring. After electrolysis, 200 mg / L of aluminum sulfate was added to conduct coagulation filtration to obtain a treated concentrate. During coagulation, coagulation was performed at 300 rpm for half a minute, followed by 5 minutes at 50 rpm.

[0020] Electro-Fenton oxidation was performed on 8 different commercial scale inhibitors. These scale inhibitors are represented by lette...

Embodiment 2

[0023] Weigh out 1.712 g of NaHCO 3 , 2.458 g CaCl 2 , 0.414 g MgSO 4 ·7H 2 O, 0.428 g NaNO 3 , placed in 800 ml of distilled water to prepare a concentrated solution with an initial pH of 7.8 and an initial LSI 0 is 2.44. Three antiscalants A, B and C were added for electrolysis, and their concentrations were all 21 mg / L.

[0024] Electrolytic anode is made of iron plate, cathode is made of porous graphite, and the area of ​​both electrodes is 45cm 2 . The cathode is ventilated by an air pump, and the air flow is 0.12m 3 / h, the electrolysis voltage was 5V, the time was 30 minutes, and the solution was electrolyzed under stirring. After electrolysis, 200 mg / L of aluminum sulfate was added to conduct coagulation filtration to obtain a treated concentrate. During coagulation, coagulation was performed at 300 rpm for half a minute, followed by 5 minutes at 50 rpm.

[0025] The result of electrolysis is figure 2 shown. As can be seen from the figure, the LSI of the c...

Embodiment 3

[0027] Weigh out 0.72 g of NaHCO 3 , 1.18 g CaCl 2 , 0.22 g MgSO 4 ·7H 2 O, 0.228 g NaNO 3 , placed in 800 ml of distilled water to prepare a concentrated solution with an initial pH of 7.8 and an initial LSI 0 is 1.86. Add scale inhibitor B, take 3 concentrations for electrolysis, which are 7, 21 and 35 mg / L respectively.

[0028] Electrolytic anode is made of iron plate, cathode is made of porous graphite, and the area of ​​both electrodes is 45cm 2 . The cathode is ventilated by an air pump, and the air flow is 0.03m 3 / h, the electrolysis voltage was 5V, the time was 30 minutes, and the solution was electrolyzed under stirring. After electrolysis, 200 mg / L of aluminum sulfate was added to conduct coagulation filtration to obtain a treated concentrate. During coagulation, coagulation was performed at 300 rpm for half a minute, followed by 5 minutes at 50 rpm.

[0029] The LSI of the treated concentrate was calculated by ion analysis of the solution f They are red...

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Abstract

The electric Fenton oxidation process for processing scale inhibitor in reverse osmosis concentrated liquid adopts anode of iron plate and cathode of porous graphite and ventilated with air pump and processes reverse osmosis concentrated liquid through electrolyzing in stirring, stirring coagulation via adding aluminum sulfate and filtering the coagulated solution. Bivalent iron ion produced intelligent the electric Fenton process is made to react with hydrogen peroxide to produce strong oxidizing free hydroxy radical oxidizing and destructing the scale inhibitor; and the subsequent coagulation separates out scaling salt to lower the scaling trend, so that the concentrated liquid may be utilized as influent water to raise the water recovering rate of reverse osmosis system.

Description

Technical field: [0001] The invention relates to an electro-Fenton oxidation method of a scale inhibitor in a reverse osmosis concentrate. The electro-Fenton method is used to reduce the scaling tendency of the reverse osmosis concentrate, improve the water recovery rate of the reverse osmosis system, and realize the concentrate Resource reuse. It belongs to the technical field of wastewater treatment in environmental science. Background technique: [0002] Reverse osmosis (RO) desalination is widely used in brackish water and seawater desalination, pharmaceutical production, high-purity water in electronic industry, beverage water, chemical production and other industrial fields. Compared with distillation desalination, reverse osmosis has the outstanding advantages of 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 ener...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D65/08C02F1/44
Inventor 杨庆峰
Owner SHANGHAI JIAO TONG UNIV
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