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A treatment method for fluorine-containing wastewater

A treatment method and technology for wastewater, applied in multi-stage water treatment, water/sewage treatment, natural water treatment, etc., and can solve problems such as difficult molecular sieve production enterprises

Active Publication Date: 2016-05-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above various methods are difficult to be effectively applied in molecular sieve production enterprises. - , SO 4 2- and Al 3+ Fluoride removal treatment of fluorine-containing wastewater with high content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] This example is used to illustrate the treatment method of fluorine-containing wastewater provided by the present invention.

[0068] Molecular sieve production of fluorine-containing wastewater: F - Content: 433mg / L; SO 4 2- Content: 12218mg / L; Al 3+ Content: 1022mg / L; pH: 4.11.

[0069] Catalyst plant containing aluminum-containing compounds and fluorine-free solid waste residue: moisture content: 80% by weight; expressed as Al 2 o 3 Calculated, the aluminum content in the solid waste residue: 4.8% by weight;

[0070] First use NaOH aqueous solution (mass percentage concentration is 35% by weight) to adjust the pH of the wastewater to 6.1, and stir for 10 minutes;

[0071] Then, add 2 mg / L of PAM to the wastewater that has adjusted the pH value, mix uniformly and carry out coagulation aiding reaction, settle for 90 minutes, and obtain the first supernatant;

[0072] Under stirring, add the solid waste slag containing aluminum-containing compounds to the separat...

Embodiment 2

[0075] This example is used to illustrate the treatment method of fluorine-containing wastewater provided by the present invention.

[0076] Molecular sieve production of fluorine-containing wastewater: F - Content: 520mg / L; SO 4 2- Content: 12257mg / L; Al 3+ Content: 1650mg / L; pH: 3.95.

[0077] Catalyst plant containing aluminum-containing compounds and fluorine-free solid waste residue: moisture content: 82% by weight; expressed as Al 2 o 3 Calculated, the aluminum content in the solid waste residue: 9.5% by weight.

[0078] First use NaOH aqueous solution (mass percentage concentration is 35% by weight) to adjust the pH of the wastewater to 6.5, and stir for 15 minutes;

[0079] Then, add 2 mg / L of PAM to the wastewater with adjusted pH value, mix uniformly and carry out coagulation aiding reaction, settle for 90 minutes, and obtain the first supernatant;

[0080] Under stirring, add the solid waste slag containing aluminum-containing compounds to the first supernata...

Embodiment 3

[0083] This example is used to illustrate the treatment method of fluorine-containing wastewater provided by the present invention.

[0084] Molecular sieve production of fluorine-containing wastewater: F - Content: 370mg / L; SO 4 2- Content: 9800mg / L; Al 3+ Content: 1120mg / L; pH: 3.99.

[0085] Catalyst plant containing aluminum-containing compounds and fluorine-free solid waste residue: moisture content: 85% by weight; expressed as Al 2 o 3 Calculated, the aluminum content in the solid waste residue: 5.5% by weight.

[0086] First use NaOH aqueous solution (mass percentage concentration is 30% by weight) to adjust the pH of the wastewater to 7.0, and stir for 15 minutes;

[0087] Then, add 1 mg / L of PAM to the wastewater with adjusted pH value, mix well and carry out coagulation aiding reaction, settle for 90 minutes, and obtain the first supernatant;

[0088] Under stirring, add solid waste residue containing aluminum-containing compounds to the first supernatant, the...

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PUM

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Abstract

A treating method of fluorine-containing waste water is disclosed. The fluorine-containing waste water comprises F-, SO4<2-> and Al<3+>. The method includes: adjusting the pH value of the fluorine-containing waste water to be not lower than 5 so as to subject the F- to neutralization and sedimentation reactions; bringing the fluorine-containing waste water after the neutralization and sedimentation reactions and coagulant aids into contact; separating solid and liquid to obtain first sludge and a first liquid phase; bringing the obtained first liquid phase and an aluminum-containing compound capable of adsorbing the F- in the waste water into contact to perform coagulating sedimentation; separating liquid and solid to obtain second sludge and a second liquid phase; bringing the obtained second liquid phase and coagulant aids into contact; and performing liquid-solid separation to obtain third sludge and discharged treated water. The method can perform effective fluorine removal treatment for the fluorine-containing waste water having high contents of the F-, the SO4<2-> and the Al<3+>.

Description

technical field [0001] The invention relates to a treatment method for fluorine-containing wastewater, in particular to a treatment method for effectively removing fluorine from fluorine-containing wastewater produced in the molecular sieve production process. Background technique [0002] Phosphorus-containing skeleton silicon-rich ultra-stable Y molecular sieve (PSRY molecular sieve) is a new type of skeleton silicon-rich molecular sieve prepared by NaY molecular sieve through hydrothermal roasting and complex acid dealumination of silicon. It is prepared with PSRY molecular sieve as the main active component Fluid catalytic cracking (FCC) catalyst has the characteristics of good coke selectivity, high gasoline octane number, strong heavy oil cracking ability, and high diesel yield. After successful industrial trial production, FCC with PSRY molecular sieve as the main active component The catalyst has been used in many heavy oil catalytic cracking units across the country...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/14
CPCC02F1/28C02F1/5236C02F1/5272C02F1/56C02F1/66C02F9/00C02F2101/14C02F2103/34C02F2301/08
Inventor 桑军强马欣高峰
Owner CHINA PETROLEUM & CHEM CORP
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