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Pretreatment device and pretreatment method for high-hardness fluorine-containing wastewater

A pretreatment device, high hardness technology, applied in the field of water treatment, can solve the problems of blockage of heating pipes, frequent chemical cleaning of devices, etc.

Pending Publication Date: 2022-03-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Untreated waste water directly entering the evaporation crystallization system will cause scaling of carbonate hardness, permanent hardness, dissolved silicon and other substances that are easy to scale and deposit on the heating tube and the wall of the evaporation chamber, resulting in blockage of the heating tube and frequent chemical cleaning of the device

Method used

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  • Pretreatment device and pretreatment method for high-hardness fluorine-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] The water quality characteristics of the wastewater treated in Example 1 are that the hardness is 300 mg / L, the pH is 7.2, the total silicon content is 87 mg / L, the fluoride ion content is 85 mg / L, the calcium ion content is 58 mg / L, and the magnesium ion content is 36 mg / L; the influent flow of wastewater is 300t / h.

[0121] The structural representation of the pretreatment device that adopts in embodiment 1 is as figure 1 As shown, it includes a wastewater storage tank 101, a primary coagulation reaction tank 201, a secondary coagulation reaction tank 202, a tertiary coagulation reaction tank 203, a microfiltration membrane filter 301 and a water production tank 401 connected in sequence, and also includes The aeration system 501 connected to the microfiltration membrane filter 301, the mud storage tank 601 connected to the microfiltration membrane filter 301, and the plate and frame filter press 602 connected to the mud storage tank 601, wherein,

[0122] The first...

Embodiment 2

[0133] The water quality characteristics of the wastewater treated in Example 2 are that the hardness is 385 mg / L, the pH is 8.2, the total silicon content is 65 mg / L, the fluoride ion content is 96 mg / L, the calcium ion content is 75 mg / L, and the magnesium ion content is 46 mg / L; the influent flow of waste water is 200t / h.

[0134] The pretreatment device adopted in embodiment 2 is the same as embodiment 1.

[0135] The steps for preprocessing include:

[0136] (1) After the wastewater enters the primary coagulation reaction tank, add lime and polyaluminum chloride to the water body, and then add sodium hydroxide until the pH in the wastewater is 9, and the residence time of the tank body is 1.5 hours; add lime to the wastewater After the step, the mass ratio of the sum of calcium ions and magnesium ions in the waste water to the total silicon is 5:1; after the step of adding polyaluminum chloride to the waste water, the mass ratio of the aluminum ions in the waste water t...

Embodiment 3

[0143] The water quality characteristics of the wastewater treated in Example 3 are that the hardness is 486mg / L, the pH is 7.4, the total silicon content is 48mg / L, the fluoride ion content is 64mg / L, the calcium ion content is 86mg / L, and the magnesium ion content is 67mg / L; the influent flow of waste water is 350t / h.

[0144] The pretreatment device adopted in embodiment 3 is the same as embodiment 1.

[0145] The steps for preprocessing include:

[0146] (1) After the waste water enters the primary coagulation reaction tank, add lime and aluminum sulfate in the water body, then add sodium hydroxide until the pH in the waste water is 9, and the residence time of the pond body is 50min; after adding the lime step in the waste water, The mass ratio of the sum of calcium ions and magnesium ions in the waste water to the total silicon is 5:1; after the step of adding aluminum sulfate to the waste water, the mass ratio of the aluminum ions in the waste water to the fluoride io...

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Abstract

The invention provides a pretreatment device for high-hardness fluorine-containing wastewater. The pretreatment device comprises a first-stage coagulation reaction tank, a second-stage coagulation reaction tank, a third-stage coagulation reaction tank, a microfiltration membrane filter and an optional water producing tank which are connected in sequence. The device has the characteristics of synergistic removal of calcium, magnesium, silicon and fluorine pollutants, good effluent quality, small occupied area and low construction cost and operation cost.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a pretreatment device and a pretreatment method for high-hardness fluorine-containing wastewater. Background technique [0002] In recent years, with the rapid development of the refining and chemical industry, the amount of wastewater produced in the industrial production process has been increasing year by year, and the resulting water pollution has become a major problem of environmental pollution in my country. [0003] The waste water mainly comes from the waste water generated in the production process section, the circulating water sewage, the reverse osmosis concentrated water of the desalination station or the resin neutralization water, etc. This kind of wastewater has the characteristics of complex components, large differences in chemical properties, serious scaling tendency, and difficult treatment. At the same time, the state requires that the waste water generated b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/5281C02F5/02C02F1/583C02F1/60C02F1/66C02F1/444C02F2209/055C02F2209/06C02F2209/10C02F2301/08C02F2303/14
Inventor 张新妙任鹏飞郦和生彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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