Water and Wastewater.com Help Forums - High BOD in Effluent of Trickling filter plant

T_AA_S YaBB Newbies Offline I love Water and Wastewater.com Posts: 1 Gender: Company or Organization: County of Los Alamos	High BOD in Effluent of Trickling filter plant Jan 11^th, 2012, 11:12pm In a plant consisting of two Primary Clarifiers, one primary and one polishing Trickling filter and one Secondary Clarifier, I have a problem that just came up with High BOD. Any suggestions would help
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DS

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Re: High BOD in Effluent of Trickling filter plant
Reply #1 - Jan 12^th, 2012, 3:46am

T_AA_S,

I think you should consider two possibilities to start with, assuming that the increase effluent BOD/COD is not caused by suspended solids (biomass):
1) either the plant received a peak load of soluble BOD, which partially ran through till the effluent
2) either there were toxics present in the influent, knocking out (a part of) the first trickling filter.

can you give us some figures?

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alexisrois YaBB Newbies Offline I love Water and Wastewater.com Posts: 10 Gender: Company or Organization: alexisrois co.	Re: High BOD in Effluent of Trickling filter plant Reply #2 - Feb 15^th, 2012, 6:52am Algae or tetrads increasing in any aerated lagoon systems, lakes or wastewater treatment plants can improve both the TSS & the CBOD5 of the effluent. This can cause incorrect high BOD and TSS levels in ultimate effluent permits.
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grrun God Member Offline WaterandWastewa ter.Com is the best! Posts: 3526 Pekin, IL Gender: Company or Organization: Freelance Environmental Engine	Re: High BOD in Effluent of Trickling filter plant Reply #3 - Feb 15^th, 2012, 1:17pm Do you have any other discharge results for the high BOD sample such as TSS, Nitrate, Ammonia Nitrogen, COD, etc. and from the previous sample's results? grrun
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The sludge judge God Member Offline Posts: 649 Wisconsin Gender: Company or Organization: private	Re: High BOD in Effluent of Trickling filter plant Reply #4 - Feb 15^th, 2012, 3:27pm good advice given by Runyan and DS. I respectfully don't understand how the other ones would fit into this topic. (looks like spam?)
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Nick_M

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Re: High BOD in Effluent of Trickling filter plant
Reply #5 - Feb 16^th, 2012, 9:06am

Build a quick spreadsheet model of the primary & secondary filters,
use an empirical filter performance model to estimate the effluent from the primary filter,
feed this into the secondary filter model,
use the same empirical model to estimate secondary filter performance,
then check the hydraulic load on the secondary clarifier.

This should give you a view on the capacity of your system. Sample the primary clarifier effluent, and see if it is greater than the max you can treat.

Pearce biofilm model is in the public domain and is widely recognised as the most developed filter model.

n...

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maxxypane Ex Member	Re: High BOD in Effluent of Trickling filter plant Reply #6 - Mar 31^st, 2012, 12:32am The treatment performance of two-stage additional treatment consisting of a trickling filter followed by activated sludge process for treatment of mixed municipal & industrial wastewater is determined.
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