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How to deactivate N-(3-aminopropyl)-N-dodecylpropane-1,3-diamine ?

How to deactivate N-(3-aminopropyl)-N-dodecylpropane-1,3-diamine ?

(OP)
Hi everybody,

The disinfectant N-(3-aminopropyl)-N-dodecylpropane-1,3-diamine is present in the wastewater I want to treat through an active sludge system.

I'm searching for a way to deactivate it to enable bacteria growth. I know it is a polyamine, a weak base, a non ionique surfactant and a bactericide.

I can't use an oxydant or an acid to degrade it because of the organic matter of wastewater.

If you have an idea, I will be very grateful.

If you want to see the molecule
http://www.chemicalbook.com/ChemicalProductPropert...

RE: How to deactivate N-(3-aminopropyl)-N-dodecylpropane-1,3-diamine ?

What concentration are you working with and do you have an easy measurement method?

Regards
Ashtree
"Any water can be made potable if you filter it through enough money"

RE: How to deactivate N-(3-aminopropyl)-N-dodecylpropane-1,3-diamine ?

You could try hydrogen peroxide to oxidise it or perhaps a UV/peroxide combination.
But i woulde be tempted to try to acclimatise a batch process activated sludge to treat it. If you can measure the concentration easily you could start out with a lab scale plant treating just a few litres perhaps using raw sewage as a feed source if the N-(3-aminopropyl)-N-dodecylpropane-1,3-diamine solution is otherwise nutrient deficient.
Acclimatisation will probably be at least 2 SRT (solid retention time) but may be much longer.

Regards
Ashtree
"Any water can be made potable if you filter it through enough money"

RE: How to deactivate N-(3-aminopropyl)-N-dodecylpropane-1,3-diamine ?

(OP)
Hi ashtree,

Thanks for your advice.

I have not made the wastewater analysis yet. However my calculations gave me a concentration between 34 and 61 mg/L.
The original solution has a concentration of 24 g/L. The purchaser recommend to use a diluted solution between 0.1% and 3%. It means between 24 mg/L and 720 mg/L.

Do you think the bacteria of the sludge has a chance to treat it ? I will try in a lab as you said but the concentration seems pretty high... I should maybe design the biologic reactor sufficiently big to dilute it below the 24 mg/L ...

I don't think UV oxidation will be possible because of the turbidity of the water.

About the hydrogen peroxyde, I'm afraid the organic matter of the sewage will be oxidised before the molecule.

Regards

RE: How to deactivate N-(3-aminopropyl)-N-dodecylpropane-1,3-diamine ?

More questions.

Is the N-(3-aminopropyl)-N-dodecylpropane-1,3-diamine already mixed in with other wastewater or is it in a stream of its own? Why i ask is that would it be possible to treat this stream with ozone or peroxide or UV before mixing with anything else.

Where does this wastewater ultimately go and is there any limits set for N-(3-aminopropyl)-N-dodecylpropane-1,3-diamine or subsequent breakdown products?

What happens to your waste sludge stream?

What are the volumes that we are dealing because if it is only small and or irregular you might be better to use another option all together?

Obviously a lower concentration is better as the disisnfectant will impact on the activated sludge system particularly for a start. If you can acclimatise the sludge to handle it then you may be able to gradually increase the concentration. A large reactor will be beneficial in that it will offer a longer detention time and allow very slow reaction rates.

Of course it may not be possible to achieve any useful reduction in concentrations at all, reaction rates may be very slow, or the breakdown products just as problematic.

Regards
Ashtree
"Any water can be made potable if you filter it through enough money"

RE: How to deactivate N-(3-aminopropyl)-N-dodecylpropane-1,3-diamine ?

This product appears to be readily biodegradable and should be treatable with the activated sludge system.

http://www.svdh.ch/fileadmin/dokumente/pdf/sicherh...

Where does the treatability concern originate?

Before investigating advanced treatment steps such as oxidation, it would be worthwhile to have a professional consultant run a bench scale activated sludge test.

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