Acidic wastewater treatment system and technological method

Abstract

The invention discloses an acidic wastewater treatment system and an acidic wastewater treatment technological method. The acidity is reduced by adding a natural mineral material, the pH is adjusted by adding alkali, and aluminum ions are produced into aluminum hydroxide; while the acidity is reduced, calcium in the natural mineral material is converted into calcium ions and the calcium ions reactwith sulfuric acid or phosphoric acid in waste acid to produce calcium sulfate or calcium phosphate; the aluminum hydroxide, the calcium sulfate and the calcium phosphate are recycled; the acidic wastewater treatment system occupies a small floor area, has a large treatment amount and saves the civil engineering cost and the equipment investment cost; by the acidic wastewater treatment technological method, the amount of produced sludge is small, and huge waste as well as formation of a large amount of waste slag, which are caused by underutilization of lime are avoided; by the acidic wastewater treatment technological method, the aluminum hydroxide, the calcium sulfate and the calcium phosphate can be recycled, resource disposal of wastewater is achieved, formation of secondary pollutionis avoided, and the environment-friendly effect is outstanding.

Description

technical field

[0001] The invention relates to the technical field of wastewater treatment, in particular to an acid wastewater treatment system and a treatment process method thereof. Background technique

[0002] The wastewater produced by cleaning the surface of aluminum foil contains a large amount of mixed acid and aluminum ions (free acid content is 0.5-17%, aluminum ion content is 2-8%), and the traditional treatment method is acid-base neutralization. Method 1: Add a large amount of liquid caustic soda or caustic soda, adjust the acidic wastewater to neutral, and convert aluminum ions into aluminum hydroxide. After sedimentation, the sludge is sent to the filter press room for dehydration treatment, and the supernatant is discharged up to the standard; Method 2: Throwing Add a large amount of quicklime powder or slaked lime for neutralization.

[0003] The above two methods are neutralized by acidic wastewater and alkaline substances, through chemical reaction and ...

Examples

Embodiment Construction

[0041] Such as figure 1 , an acidic wastewater treatment system, comprising a first waste acid pool 1, a second waste acid pool 2, an ore barrel, an alkali barrel, a flocculant barrel 10, a first stirring tank 3, a stripping tank 4, and a second stirring tank 5. The first sedimentation tank 6, the first filter press 7, the second sedimentation tank 8, and the second filter press 9, the first waste acid tank 1 stores a mixed acid composed of hydrochloric acid and nitric acid, and the second Sulfuric acid or phosphoric acid is stored in the waste acid pool 2, and the mineral material barrel is equipped with natural mineral materials. The first waste acid pool 1 is connected to the water inlet of the first stirring tank 3 through the first pump body, and the first stirring tank 3 is provided with a feed port for adding the natural mineral material in the mineral material barrel, the first stirring tank 3 is provided with an agitator, and the water outlet of the first stirring tan...

technical field

[0001] The invention relates to the technical field of wastewater treatment, in particular to an acid wastewater treatment system and a treatment process method thereof. Background technique

[0002] The wastewater produced by cleaning the surface of aluminum foil contains a large amount of mixed acid and aluminum ions (free acid content is 0.5-17%, aluminum ion content is 2-8%), and the traditional treatment method is acid-base neutralization. Method 1: Add a large amount of liquid caustic soda or caustic soda, adjust the acidic wastewater to neutral, and convert aluminum ions into aluminum hydroxide. After sedimentation, the sludge is sent to the filter press room for dehydration treatment, and the supernatant is discharged up to the standard; Method 2: Throwing Add a large amount of quicklime powder or slaked lime for neutralization.

[0003] The above two methods are neutralized by acidic wastewater and alkaline substances, through chemical reaction and ...

Examples

Embodiment Construction

[0041] Such as figure 1 , an acidic wastewater treatment system, comprising a first waste acid pool 1, a second waste acid pool 2, an ore barrel, an alkali barrel, a flocculant barrel 10, a first stirring tank 3, a stripping tank 4, and a second stirring tank 5. The first sedimentation tank 6, the first filter press 7, the second sedimentation tank 8, and the second filter press 9, the first waste acid tank 1 stores a mixed acid composed of hydrochloric acid and nitric acid, and the second Sulfuric acid or phosphoric acid is stored in the waste acid pool 2, and the mineral material barrel is equipped with natural mineral materials. The first waste acid pool 1 is connected to the water inlet of the first stirring tank 3 through the first pump body, and the first stirring tank 3 is provided with a feed port for adding the natural mineral material in the mineral material barrel, the first stirring tank 3 is provided with an agitator, and the water outlet of the first stirring tan...

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