Water and Wastewater.com Help Forums - Coag/floc of detergents?

maer

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Coag/floc of detergents?
May 16^th, 2012, 10:48pm

Hi, I'm new here.

I would like to request for help/advice by the experts here on treating this water from a detergent production company.

The company produces detergents with about 13% of surfactants, which are mostly:
- SLS (sodium laureth sulfate)
- LAS / LABS (Linear alkyl benzene sulfonate)
- some sort of chlorate ???

I believe that the 3rd surfactant they use is for allowing indoor drying of the washed clothes (without having any malodor).

Based on the BOD/COD ratio obtained of the sample, the ratio is less than 0.2, which to m, it means that chemical process (coag/floc) is the most suitable method.

We had tried various combinations of alum, caustic, FeCl3, organo floc, and anionic floc, and had succeeded to a certain extent.

Shocked

however, if someone here can suggest a more suitable treatment method using chemicals, please do kindly advise, along with the conditions, eg pH, time needed, dosage etc.

Thank you very much

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DrHenry

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Re: Coag/floc of detergents?
Reply #1 - May 18^th, 2012, 10:14am

You seem to have covered the lot, but two I don't see are ferrous sulfate and cationic polymers. Yes, cationic may not make sense, but depending on the pH, it may work. Also, for the ones you tried, make sure you are doing the full range of pH (5-9) not just suggested values. For the inorganics, make sure you are taking them up to ridiculous ranges of 1000-2000 mg/L.

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Jeff Naumann God Member Offline I love Water and Wastewater.com Posts: 1133 Torrance, California Gender: Company or Organization: Jeff Naumann & Associates	Re: Coag/floc of detergents? Reply #2 - May 18^th, 2012, 2:28pm I don't know if these studies will help, but: http://www.warponline.org/research_papers/pdf/pdf206.pdf http://www.academicjournals.org/ajb/pdf/pdf2009/20Mar/Ojo%20and%20Oso.pdf
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sobisch

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Re: Coag/floc of detergents?
Reply #3 - May 21^st, 2012, 1:57am

Dear Maer,

the first two surfactants you mentioned have good biodegradability. The mentioned 'chlorate' then seems to be the problem.
Adaptation of the biomass might be a solution. The oxidizing third compound may loose its activity during storage. A buffer tank might reduce the problems for biodegradation. Would it be possible to treat the third compound separately?

Kind regards
T. Sobisch

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T. Sobisch
for@appliedcolloidssurfactants.info
http://AppliedColloidsSurfactants.blogspot.com
http://www.AppliedColloidsSurfactants.info
http://www.lum-gmbh.com

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