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A treatment method for circulating water and sewage to be reused in power plants

A treatment method and technology of circulating water, applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, general water supply saving, etc. The problems such as the decrease of permeate production water volume, etc., can achieve the effect of reducing the efflux of wastewater, reducing alkalinity and hardness, and reducing the hardness of influent water.

Active Publication Date: 2015-11-25
STATE GRID HEBEI ENERGY TECH SERVICE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Circulating water and sewage water quality components are complex, the salt content in water, COD, SiO 2 , hardness, alkalinity and other indicators are doubled compared with natural water, when it is reused for reverse osmosis treatment, it is very easy to cause reverse osmosis scaling and fouling, resulting in a decrease in reverse osmosis output, shortened operation cycle, and frequent Chemical cleaning and insufficient water supply to the power plant will shorten the life of the reverse osmosis membrane element in severe cases, greatly affecting the stability of the reverse osmosis operation of the power plant
[0003] At present, reverse osmosis fouling often occurs in the operation of power plants that use circulating water and sewage reuse. Reverse osmosis has a decrease in water production, an increase in pressure difference, and a decrease in desalination rate, which affects operational stability.
At the same time, the current conventional reverse osmosis recovery rate is 75%, that is, about a quarter of the influent water is discharged directly as concentrated water without recycling, which is a big waste for the system

Method used

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  • A treatment method for circulating water and sewage to be reused in power plants
  • A treatment method for circulating water and sewage to be reused in power plants
  • A treatment method for circulating water and sewage to be reused in power plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Set the water volume to 200m 3 / h of circulating water sewage is injected into the mechanical agitation acceleration clarification tank, and its hardness value and alkalinity value are measured to be 12.72mmol / L and 6.45mmol / L respectively, and sodium hydroxide is added to the above-mentioned circulating water to soften, so that the hydrogen and oxygen in the circulating water The root concentration is 0.1-0.4mmol / L, then add polyferric sulfate and polyacrylamide to the softened circulating water for coagulation and clarification treatment, the addition amount of polyferric sulfate and polyacrylamide is 40mg / L and 1.0mg respectively / L; The mechanical agitation acceleration clarification tank adopts a Ф14300 mechanical agitation acceleration clarification tank, and the design output is 180-350m 3 / h. See Table 1 for the water quality of the power plant's circulating water and sewage.

[0027] Table 1 Water quality of circulating water and sewage

[0028]

[0...

Embodiment 2

[0040] The hardness value and alkalinity value of circulating water sewage in this embodiment are 14.20mmol / L and 6.50mmol / L respectively, add sodium hydroxide to soften, make the concentration of hydroxide in circulating water be 0.1-0.4mmol / L; The addition amounts of polyferric sulfate and polyacrylamide were 20 mg / L and 0.6 mg / L respectively; other steps were the same as in Example 1. The water quality of the reverse osmosis produced water in this embodiment also meets the reuse standard.

Embodiment 3

[0042] In this embodiment, the hardness value and alkalinity value of the circulating water sewage are 13.50mmol / L and 7.20mmol / L respectively, and sodium hydroxide is added for softening, so that the concentration of hydroxide in the circulating water is 0.1-0.4mmol / L; The addition amounts of polyferric sulfate and polyacrylamide were 10 mg / L and 2 mg / L respectively; other steps were the same as in Example 1. The water quality of the reverse osmosis produced water in this embodiment also meets the reuse standard.

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Abstract

The invention relates to a treatment method for recycling circulating sewage in a power plant. The treatment method comprises the step of treating the circulating sewage with coagulation clarification, filtration, weak-acid cation exchange, first-stage reverse osmosis treatment and second-stage reverse osmosis treatment in sequence. Drained anti-osmosis water obtained by the treatment method provided by the invention has good quality and can be directly used for water replenishment of a heat supply network of a power plant, and water replenishment of a water source and circulating water of a chemical replenished water treatment system.

Description

technical field [0001] The invention relates to a treatment method for recycling circulating water and sewage to a power plant. technical background [0002] Sewage reuse of circulating water is an effective way to solve the shortage of water resources in power plants and realize the reduction of sewage discharge and the utilization of sewage resources. Circulating water and sewage water quality components are complex, the salt content in water, COD, SiO 2 , hardness, alkalinity and other indicators are doubled compared with natural water, when it is reused for reverse osmosis treatment, it is very easy to cause reverse osmosis scaling and fouling, resulting in a decrease in reverse osmosis output, shortened operation cycle, and frequent Chemical cleaning and insufficient water supply to the power plant will shorten the life of the reverse osmosis membrane element in serious cases, which greatly affects the stability of the reverse osmosis operation of the power plant. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCY02A20/131
Inventor 龙潇刘克成王平马东伟任汉涛张建华白翠霞王艳饶群
Owner STATE GRID HEBEI ENERGY TECH SERVICE CO LTD
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