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Inorganic inducing treatment for reverse osmosis concentrate

A technology of reverse osmosis concentrate and treatment method, which is applied in the field of waste water treatment in environmental science, can solve the problems such as unusable, and achieve the effects of low cost in the treatment process, improved water recovery rate, and environmental friendliness

Inactive Publication Date: 2005-07-13
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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  • Inorganic inducing treatment for reverse osmosis concentrate
  • Inorganic inducing treatment for reverse osmosis concentrate
  • Inorganic inducing treatment for reverse osmosis concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Simulate the concentrate with 88% recovery rate of a desalination plant, weigh NaCl, MgCl 2 , CaCl 2 , NaHCO 3 , mixed with distilled water, placed in a 1L flask, and added 25ppm antiscalant C to make a concentrated solution, in which Ca 2+ = 680ppm, Mg 2+ =540ppm, Na + =2780ppm, HCO 3 - =2890ppm, Cl - = 4880ppm. The concentrate had a pH of 7.9 and an LSI of 2.7. Add 50 grams of inorganic inducer TAN, place the flask in a shaker with a constant temperature water bath, and shake and mix for 29 hours. During this period, samples were taken several times for analysis of solution pH, conductivity, turbidity, ion concentration, etc.

[0017] After the concentrate is treated, 200mg / L of aluminum sulfate is added for coagulation and filtration to obtain the treated concentrate. When coagulating, coagulate at 300 rpm for half a minute, then at 50 rpm for 5 minutes.

[0018] After the induction treatment, the calcium ion in the concentrated solution was reduced by 130...

Embodiment 2

[0021] Weigh NaCl, MgCl 2 , CaCl 2 , NaHCO 3 , mixed with distilled water, put into three 1L flasks, and added 25ppm of three different types of commonly used scale inhibitors A, B, C (they contain -COOH, -PO 3 h 2 ,-OH,-SO 3 H, -COOR group), made into concentrated solution, in which Ca 2+ = 680ppm, Mg 2+ =540ppm, Na + =2780ppm, HCO 3 - =2890ppm, Cl - = 4880ppm. Add inducer TAN20g / L, shake and mix in constant temperature water bath for 26 hours.

[0022] After the concentrate is treated, 200mg / L of aluminum sulfate is added for coagulation and filtration to obtain the treated concentrate. When coagulating, coagulate at 300 rpm for half a minute, then at 50 rpm for 5 minutes.

[0023] The analysis results of calcium ions changing with time are as follows: figure 2 shown. from figure 2 It can be seen that 20g / LTAN can effectively induce the deposition of calcium ions, and 67%-73% of the calcium ions in the concentrated solution are induced to deposit, and the in...

Embodiment 3

[0026] Weigh NaCl, MgCl 2 , CaCl 2 , NaHCO 3 , mixed with distilled water, put into three 1L flasks, and added 25ppm antiscalant C respectively to make a concentrated solution, in which Ca 2+ = 680ppm, Mg 2+ =540ppm, Na + =2780ppm, HCO 3 - =2890ppm, Cl - = 4880ppm. Add inducer TAN 5g / L, 10g / L, 20g / L respectively, shake and mix in constant temperature water bath for 26 hours.

[0027] After the concentrate is treated, 200mg / L of aluminum sulfate is added for coagulation and filtration to obtain the treated concentrate. When coagulating, coagulate at 300 rpm for half a minute, then at 50 rpm for 5 minutes.

[0028] The analysis results of calcium ions changing with time are as follows: image 3 shown. from image 3 It can be seen that after 26 hours of induction reaction, the three concentrations of inducers can effectively induce the deposition of calcium ions, and the deposition rates of calcium ions in the concentrated solution are 70.6%, 71.9%, and 73.4%, respect...

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Abstract

During inorganic inducing treatment of reverse osmosis concentrate, dolomite with CaMg(CO3)2 as main component is used as inorganic inducing agent TAN to treat the reverse osmosis concentrate containing universal antiscale. The inorganic inducing agent reacts with Ca2+, Mg2+ and HCO3- ion to make the high saturated scaling ion deposit out; then aluminum sulfate is added through stirring to coagulate; and the solution is filtered and deposited to obtain treated reverse osmosis concentrate. The inorganic inducing agent is cheap and non-toxic, the treating process is low in cost and environment friendly, and the treated concentrate may be reused as useful resource to raise the water recovering rate of reverse osmosis system.

Description

technical field [0001] The invention relates to an inorganic induction treatment method for reverse osmosis concentrated liquid. The inorganic inducer is used to reduce the fouling tendency of the reverse osmosis concentrated liquid, improve the water recovery rate of the reverse osmosis system, and realize the reuse of concentrated liquid resources. The invention 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 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, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F1/52
Inventor 杨庆峰
Owner SHANGHAI JIAO TONG UNIV
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