Complex coagulant for advanced treatment of biochemical tail water, and its preparation method and application

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 facilitating reuse, strong stability, and dense flocs

Active Publication Date: 2011-10-19
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, industrial wastes such as waste sulfuric acid, pyrite slag, scrap iron scraps, fly ash, waste boron sludge from borax production or non-metallic mineral materials containing silicon and aluminum minerals such as bentonite and kaolin , pyrophyllite, mica, feldspar, nepheline, and gibbsite as the main raw materials to prepare composite coagulants containing boron, silicon, aluminum, and iron. There are no relevant reports in domestic and foreign literature and patent databases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In Example 1 of the present invention, using bentonite, scrap iron filings, and boron mud to prepare boron-containing polysilicon-aluminum-iron, the specific steps are as follows:

[0024] (1) Alkaline hydrolysis under heating: Mix 4mol / L caustic soda solution and bentonite to react with each other.

[0025] The solid ratio is 3:1, the temperature is 150°C, and the reaction time is 4 hours. The supernatant is collected to adjust the pH to 7, and the alkaline hydrolyzed substance is obtained after aging for 90 minutes.

[0026] (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 to react, the liquid-solid ratio of the waste sulfuric acid solution to the residue of step 1, and pyrite slag The ratio is 3:1, the temperature is 100°C, and the reaction time is 4h. The supernatant liquid collected is the acid leaching material.

[0027] (3) Slow concentration and polymerization: slowly add the acid l...

Embodiment 2

[0029] In Example 2 of the present invention, kaolin, iron scraps, and boron mud are used to prepare boron-containing polysilico-aluminum-iron, and the specific steps are as follows:

[0030] (1) Alkaline hydrolysis under heating: Mix 6mol / L of caustic soda solution and kaolin to react with each other.

[0031] The solid ratio is 6:1, the temperature is 180°C, and the reaction time is 6h. The supernatant is collected to adjust the pH to 6, and the alkaline hydrolyzed substance is obtained after aging for 180min.

[0032] (2) Acid leaching under heating: Add scrap iron filings, 6mol / L waste sulfuric acid and sodium hypochlorite to the residue in step 1, and mix and stir to react. The liquid-to-solid ratio of the waste sulfuric acid solution to the residue and scrap iron filings in step 1 is 6 :1, the temperature is 150℃, the reaction time is 6h, the supernatant liquid collected is the acid leaching material.

[0033] (3) Slow concentration polymerization: slowly add the acid leaching m...

Embodiment 3

[0035] (1) Alkaline hydrolysis under heating: Mix 5mol / L caustic soda solution and gibbsite for reaction. The liquid-to-solid ratio of caustic soda solution and gibbsite is 5:1, the temperature is 200℃, and the reaction time is 8h. Adjust the pH value of the clear liquid to 6, and obtain the alkaline hydrolyzed substance after aging for 360 minutes.

[0036] (2) Acid leaching under heating: Add pyrite slag, 5mol / L waste sulfuric acid and catalytic oxidant to the residue of step 1, and mix and stir to react. The waste sulfuric acid solution is mixed with the residue of step 1, and the liquid-solid solution of pyrite slag The ratio is 4:1, the temperature is 130°C, and the reaction time is 8 hours. The supernatant liquid collected is the acid leaching material.

[0037] (3) Slow concentration polymerization: slowly add the acid leaching material, boron sludge, to the alkali hydrolyzed material, and quickly stir the polymerization reaction for 60 minutes. The volume ratio of the acid ...

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PUM

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Abstract

The invention discloses a complex coagulant for advanced treatment of biochemical tail water, and its preparation method and application. The complex coagulant is characterized in that the complex coagulant is an inorganic polymer complex coagulant prepared form industrial waste or nonmetallic mineral materials as main materials under heating conditions through the processes of alkaline hydrolysis, acid leaching oxidation, hydrolyzation and polymerization; and the complex coagulant prepared by the preparation method contains 20 to 35% of silicon, 15 to 25% of aluminum, 6 to 11% of iron and 3 to 6% of boron. Compared with the prior arts, the preparation method has the advantages of easy acquirement of raw materials, simple process, and good economical efficiency and applicability. The inorganic polymer complex coagulant prepared by the preparation method has the advantages of good performances of adsorption and bridging, charge neutrality, bonding and gathering, and decoloration, big flocs, fast sedimentation velocity of flocs, and low use amount. The complex coagulant can be widely utilized for the field of wastewater treatment, and is especially suitable for advanced treatment ofbiochemical tail water.

Description

Technical field [0001] The invention relates to a composite coagulant for advanced treatment of biochemical tail water and its preparation method and application. The raw materials are mainly industrial wastes or non-metallic mineral materials, which are suitable for the coagulation purification treatment of various waste water, and are 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 problem that has attracted much attention in the world. In particular, the shortage of water resources cannot be ignored. With the intensification of water resources crisis and the continuous deterioration of water environment quality, whether it is considered from an environmental perspective or an enterprise development perspective, advanced trea...

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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