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Aerobic Digester - Degradation of "Unbiodegradable" Organic Solids

10/10/2016

 
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It is interesting when academic research confirms something that you have observed in the field for many years. In this case, aerobic digesters stabilizing MLSS from municipal and industrial systems are modeled on the removal of VSS which contains adsorbed organics, cellular byproducts, and cells. The models maintain that the digester will remove the degradable portion of the VSS leaving an non-degradable VSS residual. The residual was based on looking at COD vs BOD20 which is also called ultimate BOD.

However, certain components of the VSS are more recalcitrant to biodegradation than others. Some parts of the VSS, or any water sample, may take longer than 20 days to be metabolized by microbes. We also see this when simple soluble organics such as sugars inhibit the degradation of fatty acids or grease. Like kids at Halloween, the bacteria go after higher energy yielding "candy" before using complex, lower energy yield compounds.

So when under starvation or very low F/M conditions, the degradation of "resistant" organics begins. This is not well modeled in conventional activated sludge equations. The paper below gives estimates that the degradation rates of “unbiodegradable” VSS between 0.006 to 0.029 d−1.

Friedrich, M. et al. "Experimental Assessmentof the Degradation of "Unbiodegradable" Organic Solids in Activated Sludge" Water Environmental Research Vol. 88, Number 3, 1 March 2016. Abstract


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9/11/2019 09:29:28 pm

An interesting discussion is worth comment. I think that you should write more on this topic, it might not be a taboo subject but generally people are not enough to speak on such topics. To the next. Cheers

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4/1/2020 11:37:54 pm

While I'm grateful for all of those experiences, being constantly on the go can start to wear you down after awhile, making it hard to appreciate the little moments, especially when you're working at the same time. I came to a realization recently that it's time to start slowing down and avoid over planning, not only to avoid the risk of burnout, but to make the most out of every experience rather than trying to cram in every bucket list adventure possible. It's something I had gotten in the habit of doing, with so little time off at most "regular" jobs. If I was lucky enough to have an entire two weeks off, I'd plan every minute of it. But there was no time for just reveling in the moment, and actually enjoying the experience for what it was.

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6/26/2020 12:26:20 am



This is the last post. So I'll go out with a bang. In this post, I've compiled a list of statistics of the trip that you may find interesting. Some are simple, like the number of states we visited, and some took us a while to find the answer, such as number of miles traveled with the RV. So let's check them out!

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9/11/2020 05:53:49 am

Great Blog! I want to thank you for the struggles you have made in writing this post.


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    Author

    Erik Rumbaugh has been involved in biological waste treatment for over 20 years. He has worked with industrial and municipal wastewater  facilities to ensure optimal performance of their treatment systems. He is a founder of Aster Bio (www.asterbio.com) specializing in biological waste treatment.

    View my profile on LinkedIn

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