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Method for treating reverse osmosis concentrate

A technology of reverse osmosis concentrated water and treatment method, applied in the field of industrial water treatment, can solve the problems of increased operating pressure and serious membrane fouling, and achieve the effects of improving efficiency, reducing membrane fouling and high production water flux

Active Publication Date: 2013-10-30
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase of water production rate, not only the membrane fouling is very serious, but also the operating pressure increases rapidly due to the increase of salinity, so it is urgent to develop an economical and feasible reverse osmosis concentrated water treatment technology

Method used

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  • Method for treating reverse osmosis concentrate
  • Method for treating reverse osmosis concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The first-stage reverse osmosis water production rate of a direct drinking water system is 50%, and the water quality of the first-stage reverse osmosis concentrated water is shown in Table 1.

[0062] Table 1 Water quality of primary reverse osmosis concentrated water in direct drinking water system

[0063]

[0064] 1. Adjust the pH value of reverse osmosis concentrated water

[0065] Add a NaOH solution with a concentration of 1mol / L to the first-stage reverse osmosis concentrated water of the direct drinking water system described in Table 1 above with a volume of 10 L, and adjust the pH value of the concentrated water to 10.10;

[0066] 2. Crystallization treatment

[0067] Add the crystallization-inducing carrier CaCO with a weight of 50 g and a particle size of 0.1-0.5 mm to the concentrated water after adjusting the pH value under stirring. 3 , carry out the crystallization reaction, the stirring and crystallization treatment time is 1.5h, and after the rea...

Embodiment 2

[0073] The water production rate of the first-stage reverse osmosis in a power plant is 60%, and the water quality of the first-stage reverse osmosis concentrated water is shown in Table 2.

[0074] Table 2 Water quality of primary reverse osmosis concentrated water in power plants with reverse osmosis water production rate of 60%

[0075]

[0076] 1. Adjust the pH value of reverse osmosis concentrated water

[0077] Adding NaOH solution and 10g sodium carbonate with a concentration of 1mol / L to the first-level reverse osmosis concentrated water of the power plant described in the above table 2 with a volume of 5L, adjusting the pH value of the concentrated water to 12.10, the sodium carbonate added in every 1L of reverse osmosis concentrated water The weight is 2g;

[0078] 2. Crystallization treatment

[0079] Add the crystallization-inducing carrier CaCO with a weight of 35 g and a particle size of 0.2-0.4 mm to the concentrated water after adjusting the pH value under...

Embodiment 3

[0085] The water production rate of the primary reverse osmosis in a power plant is 65%, and the concentrated water quality of the primary reverse osmosis is shown in Table 3.

[0086] Table 3 Water quality of primary reverse osmosis concentrated water in power plants with reverse osmosis water production rate of 65%

[0087]

[0088] 1. Adjust the pH value of reverse osmosis concentrated water

[0089] Add the NaOH solution and 9.5g sodium carbonate with a concentration of 1mol / L to the power plant first-level reverse osmosis concentrated water described in the above table 2 with a volume of 5L, adjust the pH value of the concentrated water to 11.50, and the carbonic acid added in every 1L of reverse osmosis concentrated water The weight of sodium is 1.9g;

[0090] 2. Crystallization treatment

[0091] Add the crystallization-inducing carrier CaCO with a weight of 15 g and a particle size of 0.1-0.5 mm to the concentrated water after adjusting the pH value under stirring...

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Abstract

The invention discloses a method for treating reverse osmosis concentrate. The method comprises the step of sequentially carrying out crystallization and membrane distillation on the reverse osmosis concentrate. The method is carried out at a normal pressure and a low temperature, and has the characteristics of simplicity in operation and convenience in management. The concentration of scaling ions in the reverse osmosis concentrate is reduced through induced crystallization softening, the membrane distillation concentration process can be carried out under the condition of lower membrane pollution, high-quality industrial pure water is obtained when the reverse osmosis concentrate is greatly reduced, and can be recycled in industrial production, thus the problem of treating the reverse osmosis concentrate is successfully solved, and a wide application prospect is achieved.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a reverse osmosis concentrated water treatment method, which belongs to the field of industrial water treatment. Background technique [0002] At present, as a standard water treatment technology, reverse osmosis technology has been widely used in the purification of industrial and domestic water. However, due to the existence of membrane fouling in the reverse osmosis process, the water production rate of reverse osmosis is always maintained at a low level. The theoretical water production rate of the primary reverse osmosis is 75%, but the actual water production rate is only 50%-60%. Taking the current urban reverse osmosis pure water production system of about 100,000 tons / day in Beijing as an example, enterprises need to consume nearly 150,000 tons of tap water every day, of which about 1 / 3 of the water will be directly discharged to the city as reverse osmosis brine The sewage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/66C02F5/00
Inventor 曲丹
Owner BEIJING FORESTRY UNIVERSITY
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