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Composite phosphorous removal agent for sewage treatment and preparation method thereof

A technology of sewage treatment and phosphorus removal agent, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The problem of high phosphorus cost is achieved, and the effect of low treatment cost, convenient use and storage, and high phosphorus removal effect is achieved.

Inactive Publication Date: 2013-08-07
XIAN ENVIROMENTAL PROTECTION IND TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercial chemical phosphorus removal agents on the market mainly include polyaluminum chloride, polyferric sulfate, ferric chloride, aluminum sulfate and other products. The dosage is large, the phosphorus removal effect is poor, and the phosphorus removal cost is high, which seriously restricts the chemical phosphorus removal technology. promotion and application of

Method used

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  • Composite phosphorous removal agent for sewage treatment and preparation method thereof
  • Composite phosphorous removal agent for sewage treatment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Put the aluminum processing waste with an alumina content greater than 80% in the acid solution, the mixing ratio of the aluminum processing waste and the acid solution is 0.6:1, carry out self-heating reaction under normal pressure stirring conditions, and control the temperature at 90°C ;

[0027] The acid solution is a mixed acid of sulfuric acid and hydrochloric acid, the mass fraction of sulfuric acid is 98%, the mass fraction of hydrochloric acid is 31%, and the proportion is 0.2:1.

[0028] Step 2: After two hours of reaction, add ferric chloride so that the molar ratio of iron and aluminum in the added material is 1:1.5, stir for 30 minutes, stop stirring, and stand still for 8 hours of polymerization.

[0029] Step 3: Extract the supernatant liquid in the compounding tank to prepare an aluminum oxide ferric sol solution containing aluminum, iron, sulfate, and chloride, and its alkalization degree is controlled at 30%;

[0030] Step 4: When the temperat...

Embodiment 2

[0033] Step 1: Put the aluminum processing waste with an alumina content greater than 80% in the acid solution, the mixing ratio of the aluminum processing waste and the acid solution is 0.75:1, carry out self-heating reaction under normal pressure stirring conditions, and control the temperature at 95°C ;

[0034] The acid solution is a mixed acid of sulfuric acid and hydrochloric acid, the mass fraction of sulfuric acid is 98%, the mass fraction of hydrochloric acid is 31%, and the proportion is 0.5:1.

[0035] Step 2: After reacting for two hours, add ferric chloride so that the molar ratio of iron and aluminum in the added material is 1:2.2, and then stop stirring after stirring for 30 minutes, and statically polymerize for 8 hours.

[0036] Step 3: extract the supernatant liquid in the compound pool to prepare an aluminum oxide ferric sol solution containing aluminum, iron, sulfate, and chloride, and its alkalinity is controlled at 45%;

[0037] Step 4: When the temperat...

Embodiment 3

[0040] Step 1: Put the aluminum processing waste with an alumina content greater than 80% in the acid solution, the mixing ratio of the aluminum processing waste and the acid solution is 0.9:1, carry out self-heating reaction under normal pressure stirring conditions, and control the temperature at 100°C ;

[0041] The acid solution is a mixed acid of sulfuric acid and hydrochloric acid, the mass fraction of sulfuric acid is 98%, the mass fraction of hydrochloric acid is 31%, and the proportion is 0.8:1.

[0042] Step 2: After reacting for two hours, add ferric chloride so that the molar ratio of iron and aluminum in the added material is 1:3, and then stop stirring after stirring for 30 minutes, and statically polymerize for 8 hours.

[0043] Step 3: Extract the supernatant liquid in the compounding pool to prepare an aluminum oxide ferric sol solution containing aluminum, iron, sulfate, and chloride, and its alkalization degree is controlled at 60%;

[0044] Step 4: When th...

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Abstract

The invention relates to a composite phosphorous removal agent for the sewage treatment and a preparation method thereof. The existing chemical phosphorous removal agent mainly includes products such as polymer aluminium chloride, polymer ferric sulfate, ferric chloride and aluminum sulfate, the dosage is large, the phosphorous removal effect is poor, the phosphorous removal cost is high, and the popularization of the chemical phosphorous removal technology is severely restricted. The aluminum processing waste is placed into acid liquid to be stirred and reacted under the normal pressure, and the control temperature is 90 to 100 DEG C; ferric trichloride is added after the reaction of 2 hours, and the mixture stands to be polymerized after being stirred; the supernatant liquid is pumped into a compounding pool to prepare the ferric alumina sol solution, and the degree of alkalization is controlled at 30 to 60 percent; and when the temperature of the ferric alumina sol solution is reduced to 40 DEG C or below, quaternary ammonium salt organic polymer compound is added according to the ratio of 0.2 to 5 percent, the density is adjusted by adding water to obtain the product. The obtained special chemical phosphorous removal agent is effective after being stored for three months and has the characteristics of simple production process, convenience in use and storage, high phosphorous removal effect and low processing cost.

Description

technical field [0001] The invention relates to a phosphorus removal agent, in particular to a composite phosphorus removal agent for sewage treatment and a preparation method thereof. Background technique [0002] Phosphorus fertilizers are widely used in agricultural production in my country, and urban residents use a large amount of phosphorus-containing washing powder to wash clothes, resulting in a total phosphorus content of 5-20mg / L in domestic and production sewage. Phosphorus is a kind of eutrophic substance. If it is not controlled, it can cause eutrophication of water body, cause algal blooms, cause foul smell and bad appearance in water body, and seriously affect environmental quality. In order to effectively reduce the phosphorus content in domestic wastewater, sewage treatment plants usually use biotechnology. Biological phosphorus removal has the characteristics of no additives and low treatment cost, and is widely used in sewage treatment plants in my ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58
Inventor 邸诗雨邸尚志苏林东赵胜美
Owner XIAN ENVIROMENTAL PROTECTION IND TRADE
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