Significant amount of filamentary matter in aeration basin
asked 12 October 2016 asked by Marc_dengremont (360 points)
Hello, Filaments grow when the environment is stressed, i.e., lack of aeration. First off: -Increase the aeration time in the basin -Increase the sludge extraction rate -By analogy, decrease recycling time.
What exactly does your fibrous material consist of? Are we talking algae or inert waste?
Inert waste: it's the result of a profusion of wet wipes used by local residents. The fibers are in the form of "long hairs", so it is not filamentous bacteria.
Hello, If the fibers are blocking the mixers, I just don't see a way around emptying the basin. You could take a look upstream at your screens and maybe consider installing a 2mm mesh filter.
Careful! If your screen is too fine, you will block a lot of the normal pollutants. Eventually this could create a problem downstream by upsetting the delicate balance in your aeration basin.
Absolutely...in this process you cannot change one step without first considering the ramifications. To be more clear though..it does sound as if your headworks is not working as well as it should..that type of material really shouldnt be making it to aeration except on occasion and not near enough to cause mechanical failure. If this is the case then the easiest solution would be to drain, to a point where it could be removed. I dont know if I would go through the hassle of sourcing divers...unless you got one hanging around. But I would focus on the cause more than the cure to this problem.
Hello, If you are unable to drain the basin, you could always have divers come in and manually clean it out. Normally the "fibers" are attached to the aeration diffusers. Depending on the kind you have, ideally you want to remove the tubing and clean them out. But if you have a turbine aerator system, I think divers are your best bet. After that's done, though, you have to look at your pretreatment because until that is fixed, you will continue to have problems in the aeration basin.