Recycling treatment method for aluminum anodic oxidation wastewater containing phosphoric acid and sulfuric acid
A technology for oxidizing wastewater and treatment methods, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of insufficient removal of aluminum ions, excessive alkali content, and treatment efficiency Low-level problems, to avoid secondary pollution, improve sedimentation efficiency, and avoid environmental pollution
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Embodiment 1
[0047] Take 200mL of aluminum anodic oxidation wastewater containing phosphoric acid and sulfuric acid. The water quality characteristics of the wastewater are: pH value is 0-1.0, PO 4 3- 7.1g / L, SO 4 2- 1.3g / L, Al 3+ It is 25.5g / L, SS is 220mg / L, and the steps of its processing method are:
[0048] (1) First-stage precipitation reaction: Add aluminum-removing precipitant NH to wastewater under stirring 4 F, its dosage is Al in wastewater 3+ Generate AlF 3 60% of the theoretical amount required for crystal precipitation; then stand still and obtain the first filtrate through filtration and separation;
[0049] (2) Second-stage precipitation reaction: under agitation, add ammonia solution to the first filtrate to adjust the pH value to 6.5; then stand still, and obtain the second filtrate through filtration and separation;
[0050] (3) The third-stage precipitation reaction: under stirring, add ammonia solution to the second filtrate, adjust the pH value to 8.0, and then...
Embodiment 2
[0054] Take 1L of aluminum anodizing wastewater containing phosphoric acid and sulfuric acid, the water quality characteristics of the wastewater are: pH value is 1.0-1.5, PO 4 3- 6.7g / L, SO 4 2- 1.5g / L, Al 3+ Be 30.2g / L, SS is 242mg / L, and the step of its processing method is:
[0055] (1) First-stage precipitation reaction: Add the aluminum-removing precipitant NH to the wastewater at a stirring speed of 30r / min and a stirring time of 0.2h 4 F, its dosage is Al in wastewater 3+ Generate AlF 3 70% of the theoretical amount required for crystal precipitation; then stand still and obtain the first filtrate through filtration and separation;
[0056] (2) Second-stage precipitation reaction: under the state of stirring speed of 30r / min and stirring time of 0.2h, add ammonia solution to the first filtrate, adjust the pH value to 7.0; then stand still, and obtain the second filtrate through filtration and separation;
[0057] (3) The third-stage precipitation reaction: under...
Embodiment 3
[0061] Take 3L of aluminum anodic oxidation wastewater containing phosphoric acid and sulfuric acid. The water quality characteristics of the wastewater are: pH value is 1.5-2.0, PO 4 3- 6.3g / L, SO 4 2- 1.7g / L, Al 3+ Be 33.9g / L, SS is 259mg / L, and the step of its processing method is:
[0062] (1) First-stage precipitation reaction: Add the aluminum-removing precipitant NH to the wastewater at a stirring speed of 90r / min and a stirring time of 3h 4 HF 2 , the dosage is Al in wastewater 3+ Generate AlF 3 80% of the theoretical amount required for crystal precipitation; then stand still for 0.5h, and obtain the first filtrate through filtration and separation;
[0063] (2) The second stage precipitation reaction: under the state of stirring speed 90r / min and stirring time 3h, add ammonia solution to the first filtrate, adjust the pH value to 7.5; then stand still for 0.5h, and obtain the second filtrate by filtration ;
[0064] (3) The third-stage precipitation reaction...
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