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Anonymous Poster #1

Biomass Developing Issues in Sewage Treatment

07/26/2017 10:03 AM

Dear ALL,

Presently i am working in the sewage waste water plant.it is SBR PLANT.

FAST 2 months i try to develop MLSS . I cant develop.inlet parameters are ph.7-8, tss-100-200,cod-150-200 & bod 50-60 mg/l, DO-3-4.

I SEEN two much of white foaming in sbr /aeration tank.mlss not improving/increasing. what are the reasons failure of biomass develop.

i tried to develop using cow dung .urea.dap addition also

please guide anybody.

this plant is ethiopia east africa.

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Guru

Join Date: Mar 2011
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#1

Re: Biomass Developing Issues in Sewage Treatment

07/26/2017 11:43 AM

Probable bio-toxicity aspects of the influent water, not the nutrient content. Has anyone looked at the water chemistry report as to metals and non-metals (or metalloids such as arsenic)?

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Active Contributor

Join Date: Jul 2017
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#2

Re: Biomass Developing Issues in Sewage Treatment

07/26/2017 11:43 AM

I gather Sasol in Secunda South Africa were struggling with a similar problem in Hazardous Waste Land Treatment - rehabilitating oil polluted soils - and a cup of molasses worked for them.

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Guru

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#3
In reply to #2

Re: Biomass Developing Issues in Sewage Treatment

07/26/2017 11:47 AM

Well then, there is one answer! Sometimes it is not the analysis, but the simple things that can be tried.

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Guru

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#4
In reply to #2

Re: Biomass Developing Issues in Sewage Treatment

07/26/2017 5:30 PM

Yeah but how many mole asses fit in a cup?

...no I think it's the other end....

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Guru

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#5
In reply to #4

Re: Biomass Developing Issues in Sewage Treatment

07/27/2017 8:51 AM

It is hard to tell....on either account. One mole of moles is Avogadro's number of moles, but that is a lot of mole asses.

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Guru

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#6

Re: Biomass Developing Issues in Sewage Treatment

07/27/2017 4:28 PM

pH 7-8 should be fine. Ratios TSS/BOD and COD/BOD look a bit high. BOD looks low, more typical figure for sewage is 200-250mg/l.

What are the requirements for the treated effluent, and what are the actual figures? What is the sludge SVI? You could be wasting mixed-liquor solids in the decant. How many SBR tanks?

Foaming can be a problem with any AS plant, SBR or conventional, maybe antifoam dosing would reduce it, but it probably isn't directly related to your problem.

DO 3-4mg/l is on the high side, and will encourage endogenous respiration. I would try reducing it to 1-2mg/l. That will save some power costs as a bonus!

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