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Alkalinity:VFA (Read 457 times)

arunmoozhikulam YaBB Newbies Offline I love Water and Wastewater.com Posts: 9 Oman Gender: Company or Organization: Azaliya Water Services	Alkalinity:VFA Aug 28^th, 2012, 3:51am Hi all, We are operating one STP with Activated Sludge Process. I would like to know exactly where I want sample for Analyzing Alkalinity:VFA ? Which will be the other Sampling locations for process control ? Thanks, Arun
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Re: Alkalinity:VFA
Reply #1 - Aug 28^th, 2012, 10:32am

Typically you'll look at your vfa/alkalinity ratio in an anaerobic digester where it is an important control parameter. For alkalinity you want to check the influent periodically and check the effluent to ensure there is at least a residual of 60 mg/L. These are good locations at a minimum.

VFAs can also be tested in various areas of a wastewater plant or collection system as to determine any possible areas where fermentation of the waste is occuring.

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arunmoozhikulam

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Re: Alkalinity:VFA
Reply #2 - Aug 29^th, 2012, 3:15am

Thanks for the answer.

In our plant we are not having an anaerobic digester.
Following are the Treatment stages;

Balancing Tank - Grit removal - Anoxic Tank- Aeration Basin - Clarifier-DMF-Chlorine Contact tank - Final Effluent holding tank.

As usual from Clarifier sludge is circulated to Anoxic Tank and will be wasted to Aerobic Sludge Digester/ Holding Tank.

Which are the exact sampling points to Analyse VFA:Alakalinity for process control ?
What should be the ratio and how to control this ?

Thanks and regard,

Arun

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dwi handaya God Member Offline Water and Wastewater.com is the best! Posts: 531 Indonesia Gender: Company or Organization: WWT freelancer	Re: Alkalinity:VFA Reply #3 - Aug 29^th, 2012, 9:59am For STP, you need to control nitrification and denitrification process. Nitrification : 1 mg NH3-N need approx 7,14 mg alkalinity Denitrification : 1 mg NO3 will produce 3,57 mg alkalinity Monitor effluent residual alkalinity as least 50 or 60 ppm
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