I have a question regarding wastewater hardness; I hope experts can help answer it!
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When wastewater with a hardness of 3000–4000 mg/L is introduced into an environment containing a dilute acid at a concentration of 1%–10%, at a temperature of 40–60°C, will scaling occur? And if scaling does occur, what will be the rate of its formation? Thank you! !
Which is the weak acid, sulfuric acid or hydrochloric acid? Also, should the wastewater be added to the dilute acid, or should the dilute acid be added to the wastewater? If a dilute acid is added to wastewater to control its pH, what should that value be? If hydrochloric acid is added and the pH is below 4, scaling basically does not occur. If sulfuric acid is added and the pH is below 4, calcium sulfate scale may form. If sulfuric acid is added and the pH is kept at neutral or slightly alkaline, in addition to calcium sulfate scale, calcium carbonate scale may also form. It is recommended to conduct a preliminary test based on the system requirements to analyze the loss of calcium and magnesium ions before and after mixing.
It’s best to first conduct laboratory tests on a small scale