Composite coagulant for advanced treatment of biochemical tail water, as well as preparation method and application thereof

A technology of advanced treatment and coagulant, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., to achieve the effect of dense floc, significant decolorization and strong stability

Inactive Publication Date: 2012-08-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the advanced treatment of biochemical tail water, waste sulfuric acid, pyrite slag or scrap iron scraps are used as iron sources, boron sludge is the waste of borax production, and fly ash, bentonite, kaolin, and gibbsite are used as silicon. The aluminum source is used as the main raw material to prepare a composite coagulant containing boron, silicon, aluminum and iron. There is no relevant report in domestic and foreign literature and patent databases

Method used

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  • Composite coagulant for advanced treatment of biochemical tail water, as well as preparation method and application thereof
  • Composite coagulant for advanced treatment of biochemical tail water, as well as preparation method and application thereof
  • Composite coagulant for advanced treatment of biochemical tail water, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 of the present invention, using bentonite, scrap iron scraps, and boron mud to prepare a composite coagulant for advanced treatment of biochemical tail water containing boron polysilicon aluminum iron, the specific steps are as follows:

[0025] (1) Alkaline hydrolysis under heating: Mix and stir 4mol / L caustic soda solution and bentonite for reaction, the solution of caustic soda solution and bentonite will

[0026] The solid mass ratio was 3:1, the temperature was 150°C, and the reaction time was 4 hours. The supernatant was collected to adjust the pH value to 7, and the alkaline hydrolyzed substance was obtained after aging for 90 minutes.

[0027] (2) Acid leaching under heating: add pyrite slag, 5mol / L waste sulfuric acid and hydrogen peroxide to the residue of step 1, mix and stir the reaction, the liquid-solid quality of the waste sulfuric acid solution, the residue of step 1, and pyrite slag The ratio is 3:1, the temperature is 100°C, and the reaction ...

Embodiment 2

[0032] Example 2 of the present invention utilizes kaolin, waste iron scraps, and boron mud to prepare a composite coagulant for advanced treatment of biochemical tail water containing boron polysilicon aluminum iron, and the specific steps are as follows:

[0033] (1) Alkaline hydrolysis under heating: Mix and stir 6mol / L caustic soda solution and kaolin for reaction, the solution of caustic soda solution and kaolin

[0034] The solid mass ratio was 6:1, the temperature was 180°C, and the reaction time was 6 hours. The supernatant was collected to adjust the pH value to 6, and the alkaline hydrolyzed substance was obtained after aging for 180 minutes.

[0035](2) Acid leaching under heating: Add iron scraps, 6mol / L waste sulfuric acid and sodium hypochlorite to the residue in step 1, mix and stir for reaction, and the liquid-solid mass ratio of the waste sulfuric acid solution to the residue in step 1 and scrap iron scraps The ratio is 6:1, the temperature is 150°C, and the r...

Embodiment 3

[0039] Example 3 of the present invention utilizes gibbsite, pyrite slag, and boron mud to prepare a composite coagulant for advanced treatment of biochemical tail water containing boron polysilicon aluminum iron, and the specific steps are as follows:

[0040] (1) Alkaline hydrolysis under heating: Mix and stir 5mol / L caustic soda solution and gibbsite for reaction, the liquid-solid mass ratio of caustic soda solution and gibbsite is 5:1, the temperature is 200°C, and the reaction time is 8h. The supernatant was collected to adjust the pH value to 6, and the alkaline hydrolyzed substance was obtained after aging for 360 minutes.

[0041] (2) Acid leaching under heating: add pyrite slag, 5mol / L waste sulfuric acid and catalytic oxidant to the residue of step 1, mix and stir for reaction, the liquid-solid mixture of waste sulfuric acid solution and the residue of step 1, pyrite slag The mass ratio is 4:1, the temperature is 130°C, and the reaction time is 8 hours. The collected...

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Abstract

The invention relates to a composite coagulant for advanced treatment of biochemical tail water, as well as a preparation method and application thereof. The inorganic polymer composite coagulant containing boron, silicon, aluminum and iron, which is prepared by adopting an iron source, a boron source and a silicon-aluminum source as raw materials, is applied to coagulation purification processing coagulant of all kinds of waste water, and is particularly applied to advanced treatment of the biochemical tail water. The iron source, the boron source and the silicon-aluminum source are adopted as the raw materials; the inorganic polymer composite coagulant is prepared through alkaline hydrolysis, acid leaching oxidation, hydrolysis and polymerization under heating; and the prepared composite coagulant contains 20 percent-35 percent of silicon, 15 percent-25 percent of aluminum, 6 percent-11 percent of iron, and 3 percent-6 percent of boron. The coagulant has easy-to-get raw materials and concise process, and is economic and applicable. The obtained inorganic polymer composite coagulant has good capacities of absorption and bridging, charge neutrality, bonding aggregation and decoloration, and less dosage, and is widely applied to waste water treatment field, in particular to advanced treatment of the biochemical tail water; and the flocs are big and are fast in sedimentation velocity.

Description

technical field [0001] The invention relates to a composite coagulant for deep treatment of biochemical tail water and its preparation method and application. It uses iron source, boron source and silicon aluminum source as raw materials to prepare inorganic polymers containing boron, silicon, aluminum and iron. Composite coagulant, suitable for coagulation and purification treatment of various waste water, especially suitable for advanced treatment of biochemical tail water. Background technique [0002] In recent years, the earth's energy crisis and resource shortage have become increasingly prominent, and the shortage of these indispensable natural resources has evolved into a resource and environmental issue that has attracted much attention in the world. In particular, the shortage of water resources cannot be ignored. With the aggravation of the water resource crisis and the deteriorating quality of the water environment, the advanced treatment and reuse of wastewater ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 王哲明沈树宝黄勇陈英文罗翔章继龙刘臻臻王孙崯王桂林韩晓磊郭玉旗
Owner CHINA PETROLEUM & CHEM CORP
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