A reverse osmosis pretreatment method when reclaimed water is reused in power plants

A technology of reverse osmosis and pretreatment, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of reverse osmosis output decline, high investment cost, organic matter and microorganism removal effect Poor problems, to improve stability and prolong service life

Active Publication Date: 2011-12-21
STATE GRID HEBEI ENERGY TECH SERVICE CO LTD +1
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Problems solved by technology

The composition of urban water quality is complex, the salinity, COD, SiO 2 , ammonia nitrogen, turbidity and chromaticity and other indicators are doubled compared with natural water bodies, and contain a large amount of surfactant discharged from production and life, when it is reused for reverse osmosis treatment, it is very easy to cause reverse osmosis Fouling, resulting in a decline in reverse osmosis output, shortened operating cycle, frequent chemical cleaning, insufficient water supply to the power plant, and severe cases will shorten the life of the reverse osmosis membrane element, which greatly affects the stability of the

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  • A reverse osmosis pretreatment method when reclaimed water is reused in power plants
  • A reverse osmosis pretreatment method when reclaimed water is reused in power plants

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Embodiment Construction

[0015] like figure 1 A reverse osmosis pretreatment method when the shown a kind of reclaimed water is reused in the power plant is characterized in that, comprises the following steps:

[0016] 1) Coagulation and clarification of reclaimed water; input the reclaimed water to be treated into the mechanical agitation acceleration clarification tank, and add quicklime, polyferric sulfate and polyacrylamide into the clarification tank for coagulation and clarification treatment, wherein the dosage of quicklime is to make the water hydrogen The oxygen radical reaches 0.1-0.3mmol / L, the dosage of polyferric sulfate is 10-40mg / L, and the dosage of polyacrylamide is 0.3-2.0mg / L; When the alkalinity value is large and exceeds 3mmol / L, add sodium carbonate to the system to make the difference between the hardness value and the alkalinity value less than 1mmol / L;

[0017] 2) Filtration by variable pore filter; the water treated by the clarifier is input into the variable pore filter fo...

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Abstract

The invention discloses a reverse osmosis pre-treatment method for recycling reclaimed water in an electric power plant. The reverse osmosis pre-treatment method comprises the following steps: 1) coagulating and clarifying the reclaimed water; 2) filtering in a filtering tank with variable pore aperture; 3) filtering with a multi-medium filter; 4) softening with a strong-cationic sodium ion exchanger; 5) softening with a double-chamber weak-acid and strong-acid cationic exchanger; and 6) adjusting the pH value. The reverse osmosis pre-treatment method has the advantages that: the reclaimed water is pre-treated before reverse osmosis, thereby greatly reducing the reverse osmosis scale formation and contamination blockage risks caused by hardness, COD (chemical oxygen demand), SiO2 and the like in the reclaimed water, prolonging the service life of a reverse osmosis membrane element, and improving the reverse osmosis operation stability of the electric power plant.

Description

technical field [0001] The invention relates to a pretreatment method of recycled reclaimed water before reverse osmosis applied in power plants, in particular to a reverse osmosis pretreatment method when reclaimed water is reused in power plants. Background technique [0002] Reuse of reclaimed water is an effective way to solve the shortage of water resources in power plants, and it is also an important condition for new expansion of power plants. The composition of urban water quality is complex, the salinity, COD, SiO 2 , ammonia nitrogen, turbidity and chromaticity and other indicators are doubled compared with natural water bodies, and contain a large amount of surfactant discharged from production and life, when it is reused for reverse osmosis treatment, it is very easy to cause reverse osmosis Fouling leads to a decline in reverse osmosis output, shortened operating cycle, frequent chemical cleaning, and insufficient water supply to the power plant. In severe case...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 刘克成龙潇何彩燕桑俊珍孙小军莫宗保
Owner STATE GRID HEBEI ENERGY TECH SERVICE CO LTD
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