The neutralization treatment technology of acid washing wastewater is an important step in removing acidic components from wastewater. It mainly neutralizes acidic substances into neutral substances through chemical reactions, thereby reducing their harm to the environment.

1. Neutralization principle: Neutralization reaction is a chemical reaction between acid and alkali, producing salt and water. Acid washing wastewater usually contains strong acids such as sulfuric acid and hydrochloric acid. During treatment, an appropriate amount of alkaline substances (such as sodium hydroxide, calcium hydroxide, or lime) need to be added to neutralize these acidic components. After the reaction, the pH value of the wastewater will be adjusted to a safe range (usually 6.5-8.5).

2. Selection of neutralizing agents: Common neutralizing agents include sodium hydroxide (caustic soda), calcium hydroxide (lime), etc. These neutralizing agents have good reactivity and economy. Sodium hydroxide reacts rapidly, but careful operation is required to avoid excessive foam and splash; Calcium hydroxide reacts slowly, but can form a precipitate after treatment, which is convenient for subsequent removal.

3. Control of neutralization process: During the neutralization process, it is necessary to monitor the pH value of the wastewater in real time to ensure an appropriate acid-base ratio. The use of an automated control system can achieve precise dosing and avoid situations of excess or deficiency. In addition, heat will be released during the reaction process, and appropriate reaction vessels should be considered to avoid excessive temperature.

4. Subsequent treatment: After neutralization, the wastewater may still contain suspended solids and heavy metal ions. At this point, other treatment methods such as sedimentation and filtration need to be combined to further remove residual pollutants and ensure that the effluent quality meets environmental standards.

Through effective neutralization treatment technology, acid washing wastewater can be safely treated, reducing its impact on the environment and promoting the sustainable development of industrial production.