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How much is the pH of polymerized ferric sulfate generally controlled during arsenic removal? Our company uses inclined plate precipitation, and the pH of the first-level reaction tank is controlled at around 10. The ph of charged stone slag basically does not fluctuate. Why can the ph drop from 10 to 3 when adding polymerized ferric sulfate? The flow control of polymerized ferric sulfate does not move. The dosing reaction tank is divided into two reaction tanks to process water for continuous inflow and outflow. How can we control the pH value of ferric sulfate?
The reason for the decrease in pH value is that iron ions are hydrolyzed to produce H ions. To control the pH value, you must control the amount of polymerized ferric sulfate and the quality of your raw water.
Polyferric sulfate itself is a strong acid and weak alkali salt, and the product also contains a considerable amount of sulfuric acid during production, so it is highly acidic. When iron is hydrolyzed to form iron salts and precipitates, the optimal pH is around 9, so the pH value needs to be adjusted.