What acids can be used to adjust the pH of wastewater?
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The pH of the wastewater is between 13 and 14; acid is needed to adjust this pH value. Sulfuric acid, hydrochloric acid, and *AO acid are dangerous to use. The required pH level at the discharge point is less than or equal to 4 mg/l. Do any of you have any good suggestions?
I don’t quite understand the problem described. . . Is the wastewater discharged directly after its pH is adjusted? What is the phosphorus content in wastewater?
The original poster, please rephrase the question more clearly. pH adjustment is generally expressed in terms of pH value; then why is 4 mg/L the result? For adjusting the pH of wastewater, it is best to use available waste alkali or waste acid, as this is more economical. Or find nearby companies that have acidic wastewater; this is also a more economical option. If neutralization is carried out using acids, since wastewater treatment requires control of total nitrogen and total phosphorus, *ao acid and phosphoric acid cannot be used for neutralization; instead, waste salt acid and waste sulfuric acid can be chosen.
Sulfuric acid is recommended first; if possible, it is advisable to use a concentration of 70% or less, as this reduces the heat of dilution and makes the neutralization process milder； Next are acidic wastewater; however, due to the complex composition of such wastewater and its presence of organic substances, careful handling is required to prevent the introduction of other pollutants that could increase the burden ； Next is salt acid; it is recommended to use a lower concentration. Salt acid causes severe corrosion to equipment, pipes, etc., and the operating conditions under which it is used are quite harsh, so it is not recommended.
Sulfuric acid is the best choice; just be careful to avoid damage. Hydrochloric acid can cause an increase in chloride levels
We use sulfuric acid to adjust the wastewater with a high pH value.
Sulfuric acid is the best choice; when using nitric acid or phosphoric acid, N and P are introduced, and the requirement is that the phosphorus content in the wastewater be less than 4 mg/L. The chloride ions in hydrochloric acid have strong penetrative power and can have a significant impact on equipment. While safety issues in factories are certainly important, good manufacturing processes can reduce even more problems. Acidic wastewater is not recommended, as your pH is high, the neutralization level of the wastewater is low, and its composition is complex.
Adjust the pH of alkaline wastewater with sulfuric acid