Acid alkali wastewater is a common type of wastewater treatment, and it has strong corrosiveness. If discharged directly without treatment, it will corrode pipes, channels, and buildings. Acid and alkali wastewater should be recycled and reused as much as possible, or after being resolved, the pH value of the wastewater should be between 6 and 9 before it can be discharged into the water quality. Neutralizing acidic and alkaline wastewater with each other or using waste alkali (slag) to neutralize acidic wastewater, and using waste acid to neutralize alkaline wastewater. In the absence of these conditions, acid-base wastewater treatment equipment can use neutralizing agent wastewater to solve the problem.

Neutralize acidic and alkaline wastewater with each other, or neutralize acidic wastewater with alkaline waste, or neutralize alkaline wastewater with waste acid, flue gas, etc. This method saves neutralizing drugs, has simple equipment, and low solution costs. However, the flow rate and concentration of acidic and alkaline wastewater may change, and the solution effect is usually unstable.

If there is no alkaline wastewater or alkaline waste that can be utilized, neutralization drugs are generally added to acidic wastewater or filtration neutralization method is adopted. The dosing neutralization method is to uniformly inject alkaline drugs into acidic wastewater in solution, emulsion, or powder form, and after sufficient reaction, neutralize the wastewater.

This method is suitable for various acidic wastewater, has strong adaptability, relatively stable solution effect, and can meet discharge regulations. The equipment for treating acidic and alkaline wastewater is also relatively simple, but there is a large amount of residue, which is not easy to solve. The filtration neutralization method is to allow acidic wastewater to undergo neutralization reaction based on the filter material layer with neutralization ability, and remove acidic substances. To prevent the generation of calcium sulfate from exceeding its saturation solubility, which may cause sedimentation and cover the surface of the filter material, hindering the development of neutralization reaction.

In order to prevent small particle filter media from overflowing outside the upward flow expansion neutralization filter and improve the utilization rate of large particle filter media, a variable filtration rate upward flow expansion neutralization filter has emerged.

Using neutralization method to solve acidic wastewater, such as using substances containing calcium carbonate for neutralization, usually generates a large amount of carbon dioxide, and the pH value of the treated water is about 5.5-6.0, which cannot meet the discharge standards. For this, the blowing method can be used to remove carbon dioxide and increase the pH value.

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