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A method for removing nitrite in drinking water grade polyaluminum chloride prepared by using waste acid

A polyaluminum chloride, nitrite technology, applied in aluminum chloride, chemical instruments and methods, aluminum halide and other directions, can solve the problems of difficult operation and management, incomplete removal, and inability to be widely used, and achieves good filtering effect, The effect of low equipment cost and low operating cost

Active Publication Date: 2016-06-15
长沙天水环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of incomplete removal, difficult operation and management, and inability to be widely used in traditional methods, the present invention provides a method for removing nitrite in drinking water-grade polyaluminum chloride by using waste acid, and prepares a , a wide range of water-based removers for removing nitrite in drinking water grade polyaluminum chloride

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Add slaked lime to 280mL of waste acid liquid, adjust the pH value to 9.5, a large amount of solid particles appear, settle, and discard the sediment; filter the waste acid liquid containing a small amount of suspended particles obtained above through a microfilter to obtain a clear liquid; Adjust the acidity of the above-mentioned clear liquid to 1.0, pass air into it, and carry out aeration for 2 hours; add 10ppm organic amines after aeration, and the organic amines are calculated by mass percentage, 10% diisopropylamine, 10% diethanolamine, 10% Caprolactam, 10%% hexamethylenetetramine, 10% p-ethoxyaniline and 10% o-nitroaniline; heating, when the temperature rises to 60°C, add 5% of the total mass ratio of aluminum hydroxide , while continuing to feed air; when the aluminum hydroxide is completely dissolved, add 1ppm o-phenanthroline, and when no orange red appears, continue to add 100g aluminum hydroxide, heat up to 110°C, react for 2 hours under constant stirring, a...

example 2

[0021] Add slaked lime to 280mL of waste acid liquid, adjust the pH value to 11, a large amount of solid particles appear, settle, and discard the sediment; filter the waste acid liquid containing a small amount of suspended particles obtained above through a microfilter to obtain a clear liquid; Adjust the acidity of the above-mentioned clear liquid to 1.25, pass into air, and carry out aeration for 2.5 hours; add 20ppm organic amine after aeration, and described organic amine is counted as, 15% diisopropylamine, 15% diethanolamine, 15% Caprolactam, 15% hexamethylenetetramine, 20% p-ethoxyaniline and 20% o-nitroaniline; heating, when the temperature rises to 68°C, add aluminum hydroxide that accounts for 7.5% of the total mass ratio, Continue to feed air simultaneously; When aluminum hydroxide dissolves completely, add 3ppm o-phenanthrene, when there is no orange red, continue to add 160g aluminum hydroxide, be warming up to 115 DEG C, react 2.5 hours under constant stirring, ...

example 3

[0023] Add slaked lime to 280mL of waste acid solution, adjust the pH value to 12.5, a large amount of solid particles appear, settle, and discard the sediment; filter the waste acid solution containing a small amount of suspended particles obtained above through a microfilter to obtain a clear liquid; Adjust the acidity of the above-mentioned clear liquid to 1.5, pass into air, and carry out aeration for 3 hours; add 30ppm organic amine after aeration, and described organic amine is counted as, 20% diisopropylamine, 20% diethanolamine, 20% Caprolactam, 20% hexamethylenetetramine, 30% p-ethoxyaniline and 30% o-nitroaniline; heating, when the temperature rises to 75°C, add aluminum hydroxide that accounts for 10% of the total mass ratio, Continue to feed air simultaneously; When aluminum hydroxide dissolves completely, add 5ppm o-phenanthrene, when there is no orange red, continue to add 280g aluminum hydroxide, be warming up to 120 DEG C, react 3 hours under constant stirring, ...

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Abstract

The invention relates to a method for removing nitrite in drinking water-grade polyaluminum chloride prepared by utilizing waste acid, and belongs to the field of sewage treatment. Add slaked lime to the waste acid solution to adjust the pH value, a large amount of solid particles appear, settle, and discard the sediment; filter the waste acid solution containing a small amount of suspended particles obtained above through a microfilter to obtain a clear liquid; use hydrochloric acid to adjust the above Clear liquid acidity, pass air, carry out aeration; Add organic amine after aeration, heat, when temperature rises to 60 ℃, add aluminum hydroxide, continue to pass air at the same time; When aluminum hydroxide dissolves completely, add O-nitrophenanthrene, when there is no orange-red color, continue to add aluminum hydroxide, heat up to 110°C, react under constant stirring, keep warm and ripen. The invention has good removal effect, small floor area, wide application range and wide adaptability to water.

Description

technical field [0001] The invention relates to a method for removing nitrite in drinking water-grade polyaluminum chloride prepared by utilizing waste acid, and belongs to the field of sewage treatment. Background technique [0002] There is a large amount of waste acid accumulated in the production of chemical industry, chemical fertilizer and pesticide. Using industrial waste acid as a raw material for acid preparation can not only save raw materials and reduce costs, but also reduce the pollution of waste acid to the environment. In addition, there are often salts such as nitrate and nitrite in industrial waste acid. Different materials have different corrosion resistance in acid solution, and it is of practical significance to use waste acid as the preparation of chemical preparations in acid solution [0003] Nitrite exists widely in water bodies, and its severe biological toxicity has attracted more and more attention. The toxicity mechanism of nitrite, the biologi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02B01J20/30C01F7/56C02F1/28
Inventor 赵远
Owner 长沙天水环保科技有限公司
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