Artemii Osipchuk South-Eastern University of Applied Sciences, Finland

1) I read aerator block model description and I wonder how to apply it for surface brush aerator. The only data that I have on brush aerator are oxidation rate (10 kgO[sub]2[/sub]/h-->7.8m[sup]3[/sup]O[sub]2[/sub]/h with O2_air parameter set to 100) and dimensions. What values should I set for the parameters in Group:Tank geometry, i.e., depth, A_sp, and Nd, as they relate to diffusers, but not to brush-type aerator?

2) Chemicals such as [i]calcium hydroxide[/i] and [i]ferrous sulfate[/i] are dosed upstream to influent. The chemical combination forms calcium sulfate and ferric hydroxide, which has high phosphate adsorption capacity. I do not consider P removal, but it affects C N removal anyhow, that's why I asked if there is a way to take into account it in ASM1Temp.

Thanks

Hello,

I'm a beginner in WEST and I use it to simulate a small-scale WWTP for study. It's oval-shaped oxidation ditch with clarifier. I consider C, N removal mainly and use ASM1Template.

Questions:
1) Aeration. Oxygen is supplied by bubble diffusers and surface aerators. I tried to use PI controller blocks to model oxygen supply in compartments, but when I use 2 or more PI a simulations takes ages to finish. I found that aerator Block can be used for diffusers. Is there alternative for surface aerators as well?

2) Chemical precipitation. Both calcium hydroxide and ferrous sulfate are used. What blocks should I use for them?

3) Can I calculate SRT in WEST? If so, how can I do it in my case?

BR,
Artemii