How to clean diffusers in an aeration basin?
asked 7 February 2017 asked by bonjour (480 points)
Hi, This question has already come up in the forum and the recommendation was to use formic acid.
Hi Luke, Do you have the link to that discussion. Thanks!
Fair enough but is there a particular reason?
The acid has to be weak enough to dissolve the fouling and any deposits while not damaging the pipes or the diffusers.
Formic acid is also more effective and requires a lower dose.
We have 52 pairs of diffusers. How do I determine how much of an 85% solution of formic acid to use?
Hi, Dosing of formic acid varies depending on how much fouling there is and the hardness of the water: from 50 to 500 ml of formic acid per diffuser to be injected within at least 2 hours. So, for 52 diffusers with a dosage of 300 mL/diffuser: => You will need to inject: 300 mL*52 = 15.6 L in 2 h, i.e., 7.8 L/h
Hello Feb, We use chloridric acid. I'm not sure citric would be enough (although it would be the easiest to handle). Phosphoric and formic might work but the gaz form is preferred. This method makes it so that you never have to shut down the system, which is great. Keep the air flowing, pressure up (increase the pressure / flow slightly if you can). Chloridric acid comes in a gas form, so you can inject it at the beginning of the header pipe or header section. You can order it from a few different suppliers in USA. It is fairly cost efficient. What type of diffuser are you using? Just make sure to use protective clothing and to do it correctly and safely.