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Methods for preparation and application of flocculant for treating low-concentration phosphorus-containing wastewater

A technology of wastewater flocculant and application method, which is applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., and can solve the problems of large amount of chemical sludge, large amount of sludge, and high cost

Inactive Publication Date: 2012-05-23
CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of chemical flocculation phosphorus removal are large amount of chemicals, high cost, and large amount of chemical sludge produced. The treatment effect on low-concentration phosphorus-containing wastewater is poor. The treated wastewater still needs to be combined with other processes to further treat wastewater before it can reach the standard. emission
[0004] Patent No. CN101665278 discloses a composite water treatment phosphorus removal flocculant, which is suitable for the treatment of high-concentration phosphorus-containing wastewater and can rapidly reduce the concentration of phosphorus in wastewater. Combined treatment with other processes can make the wastewater discharge up to the standard
The notification number is CN101665279, which discloses a flocculant for removing low-concentration phosphorus in water. The flocculant is synthesized from red mud and aluminum chloride. It can effectively remove low-concentration phosphorus. Phosphorus-containing wastewater has not been treated, and the amount of sludge is large, so it needs to be controlled under strong acid conditions when treating wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] The flocculant preparation method is:

[0018] Take 50mL of humic acid in a 250mL three-neck round bottom flask, add 50mL of distilled water, then put a condenser, an electric stirrer and a thermometer on the Erlenmeyer flask, put the flask in a water bath, control the temperature at 90°C, and add 30g of quaternary Ammonify hexadecyl acryloyloxyethyltrimethylaminoethyl ester, then add dibenzoyl peroxide with a mass ratio of 3% under the condition of nitrogen protection, start the electric mixer, react for 6 hours, and obtain polymerization after cooling Organic polymer flocculant: Take 100g of polyferric sulfate in a 500mL beaker, stir on an electromagnetic stirrer, add 1mg of polyepoxysuccinic acid after heating for 10min, and separate after the granular sludge in the flocculant settles to obtain a clear and transparent polymer Ferric sulfate liquid: Add 1 mg of synthetic polymeric organic polymer flocculant to the liquid, and stir at 60° C. for 30 minutes to obtain th...

example 2

[0022] The flocculant preparation method is:

[0023] Take 45mL of fulvic acid in a 250mL three-neck round bottom flask, add 55mL of distilled water, then put a condenser, electric stirrer and thermometer on the Erlenmeyer flask, put the flask in a water bath, control the temperature at 80°C, add 25g of quaternary ammonium Hexadecyl acryloyloxyethyltrimethylaminoethyl ester, then add dibenzoyl peroxide with a mass ratio of 2.5% under the condition of nitrogen protection, start the electric mixer, react for 5 hours, and obtain polymeric organic compound after cooling. Polymer flocculant: Take 100g of polyferric sulfate in a 500mL beaker, stir on an electromagnetic stirrer, add 1 mg of cationic polyacrylamide after heating for 10 minutes, and separate after the granular sludge in the flocculant settles to obtain clear and transparent polyferric sulfate Liquid; add 1 mg of synthesized polymerized organic polymer flocculant to the above liquid, and stir at 65° C. for 30 minutes to...

example 3

[0027] The flocculant preparation method is:

[0028] Take 35mL of fulvic acid in a 250mL three-neck round bottom flask, add 60mL of distilled water, then put a condenser, electric stirrer and thermometer on the Erlenmeyer flask, put the flask in a water bath, control the temperature at 80°C, add 25g of quaternary ammonium Hexadecyl acryloyloxyethyltrimethylaminoethyl ester, then add dibenzoyl peroxide with a mass ratio of 2% under the condition of nitrogen protection, start the electric mixer, react for 5 hours, and obtain polymeric organic compound after cooling. Polymer flocculant: Take 100g of polyferric sulfate in a 500mL beaker, stir on an electromagnetic stirrer, add 1 mg of polyacrylic acid after heating for 15 minutes, and separate after the granular sludge in the flocculant is precipitated to obtain a clear and transparent polyferric sulfate liquid; Add 1 mg of the synthesized polymeric organic macromolecular flocculant to the above liquid, and stir at 65° C. for 30 ...

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Abstract

The invention discloses methods for preparation and application of a flocculant for treating low-concentration phosphorus-containing wastewater, which belong to the technical field of sewage treatment. The method for preparation of the flocculant comprises the following steps of: (1) carrying out polymerization reaction on organic carboxylic acid and quarternary-ammonium hexadecyl acrylyloethyl trimethyl aminoethyl ester to obtain a polymeric organic high molecular flocculant; and (2) adding the synthesized polymeric organic high molecular flocculant into polymeric ferric sulfate, heating and stirring to obtain clear transparent light yellow liquid, namely, a phosphorous removal flocculant. The method for application of the flocculant comprises the steps of: adding the prepared flocculant into the wastewater containing phosphorus with the concentration of below 10mg / L, wherein the addition amount of the prepared flocculant is 0.1-0.5mL / L and a pH value is 6.5-8.5; stirring for 30-60min, standing and depositing; and separating mud and water, wherein the content of phosphorus in the wastewater after treatment can be lower than 0.05mg / L. The flocculant provided by the invention has low cost of chemical agent, small dosage, big alumen ustum, short forming time, firm deposit and good phosphorus removal effect, is favorable for realizing 'zero discharge ' of phosphorus and solving the difficult problem on treatment of the low-concentration phosphorus-containing wastewater, and gets remarkable social and economical benefits and a broad application prospect.

Description

technical field [0001] The invention relates to the preparation and application method of a flocculant for treating low-concentration phosphorus-containing wastewater, which belongs to the technical field of sewage treatment, and specifically relates to the phosphorus removal technology in sewage treatment. technical background [0002] Nitrogen and phosphorus are the main elements that cause water eutrophication, and phosphorus has a special contribution. With the development of society and the continuous improvement of people's living standards, the requirements for urban sewage treatment are getting higher and higher, and the indicators for phosphorus and nitrogen removal in sewage treatment are becoming increasingly strict. Therefore, the control of phosphorus and the treatment of phosphorus-containing wastewater are urgent issues at present. [0003] At present, the phosphorus removal technology of sewage mainly includes chemical phosphorus removal and biological phosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/58
Inventor 雷春生雷思宇金利军
Owner CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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