The pH of the water output from iron-carbon microelectrolysis decreases
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Dear experts, in wastewater treatment processes, when the water passes through an iron-carbon microelectrolysis cell, the pH of the incoming water is kept between 2 and 3. The normal pH of the treated water is between 5 and 6.5. These past couple of days, however, the pH has remained low, ranging between 3 and 4, while all other parameters remain unchanged. What could be the reasons for such a decrease in the pH of the treated water?
1. Insufficient aeration or mixing； 2. The surface of the filler is covered or passivated, resulting in reduced activity ； 3. Large water inflow volume and shortened residence time.
What type of microelectrolysis do you use? Is it a simple combination of iron and carbon, or are there structured fillers used? Also, have there been any changes in the water quality and volume of the incoming water?
Uneven distribution of water and gas, or in other words, caking and passivation at the bottom, leads to channeling and a reduction in the contact area, thereby shortening the relative reaction time. The microelectrolysis reaction is incomplete, so the pH level cannot rise.
Is it necessary to run the carbon-iron bed with air bubbling? Will the entry of air increase the oxidation on the surface of the iron ball, leading to surface oxidation?