Typically, in my experience, Anything that you add vs adjusting MLSS for proper MCRT and or return rates is a band-aid. If your MLSS and return rates are correct you should have the correct MCRT and F/M ratio. The only time you would add anything is if you gone too far out of balance and are violating. You have to be mindful that anything you add that increases settability in plant artificially will most likely artificially change your 30min. settling testing and SVI determination. It's better to stay ahead of the curves by closely watching your wasting and return rates. Maintaining the correct MLVSS and F/M ratios is key.
It's been over 1 year since I completed my wastewater course and I can no longer remember what those acronyms you mentioned stand for. I also have interview at a wastewater plant in 10 hrs and Im panicking.
@@Bowskidll Don't worry just answer honestly with what you know. There is a big demand for operators now and if you keep at it, you will get a job in the industry.
@@enemyofthestatewearein7945 Yes, I would only add nutrients if I needed to artificially maintain a population in support of a specific removal objective. Another time you might add nutrients would be to build up bacterial for a known increase in BOD. Like a resort location that sees an increase in population quickly. Ideally you have a steady supply of BOD and you adjust your population to address that. Then the only changes you make are for seasonal temperature changes.
@@tgchism Thanks for reply, so basically nutrient addition should be seen as a management tool for irregular loading. Otherwise, if you are adding constantly in a stable process, it's really just an expensive fix for a poorly optimized plant. Makes good sense to me, better process optimization will usually save energy, rather than increasing running costs for additives.
Typically, in my experience, Anything that you add vs adjusting MLSS for proper MCRT and or return rates is a band-aid. If your MLSS and return rates are correct you should have the correct MCRT and F/M ratio. The only time you would add anything is if you gone too far out of balance and are violating. You have to be mindful that anything you add that increases settability in plant artificially will most likely artificially change your 30min. settling testing and SVI determination. It's better to stay ahead of the curves by closely watching your wasting and return rates. Maintaining the correct MLVSS and F/M ratios is key.
It's been over 1 year since I completed my wastewater course and I can no longer remember what those acronyms you mentioned stand for. I also have interview at a wastewater plant in 10 hrs and Im panicking.
@@Bowskidll Don't worry just answer honestly with what you know. There is a big demand for operators now and if you keep at it, you will get a job in the industry.
Really interesting comment, thanks. Are you essentially saying it's better to manage bacteria levels (by optimizing return/waste rate) than keeping excess bacteria alive (to avoid foam formation) by adding nutrients?
@@enemyofthestatewearein7945 Yes, I would only add nutrients if I needed to artificially maintain a population in support of a specific removal objective. Another time you might add nutrients would be to build up bacterial for a known increase in BOD. Like a resort location that sees an increase in population quickly. Ideally you have a steady supply of BOD and you adjust your population to address that. Then the only changes you make are for seasonal temperature changes.
@@tgchism Thanks for reply, so basically nutrient addition should be seen as a management tool for irregular loading. Otherwise, if you are adding constantly in a stable process, it's really just an expensive fix for a poorly optimized plant. Makes good sense to me, better process optimization will usually save energy, rather than increasing running costs for additives.
Nice video. I have one question why there is lot of foams in pre aeration tank. ?? .
Filamentous bacteria or surfactants?
Fats oils and grease floats to surface.
Would it not be more cost effective to control the F/M trough appropriate wasting?
You don't control a plant off f/m!
Aeration tank feeding start but mlss prepare goto polymers type .but cod parameter 1500 to 2000 limit .aeration not pik feed.
How much cost this chemical
I imagine this includes a phosphate boost? Times are getting more difficult with more stringent phosphate consents...
Snake oil!