Christophe wrote:Uh ... thanks for the explanations but I'm not very familiar with the various chemical abbreviations ...
BOD5 = biological oxygen demand at 5 days, it measures the amount of oxygen that will be consumed by living organisms to degrade oxidizable organic compounds
COD = chemical oxygen demand, it is the same but it is the quantity of oxygen that it takes to chemically oxidize all oxidizable compounds.
MES: suspended matter, these are all particles light enough to be transported in a stream of water, whatever their nature
Christophe wrote:Ok for the reduction of a certain% but the product "pollutants" is not included in the products to "treat" ...
This may be the case for certain detergent compounds ...
Well yes, there is no legal obligation ...
But some products actually degrade under the conditions encountered in WWTPs.
The problem is that we don't really know what's going on according to the article.
dupontelle wrote:Finally remarks on the subject, excuse me for my previous email, it is true that it was not necessarily appropriate.
It's a bit what I blame for a first message ...
Not having taken the time to do some reading on this forum to appreciate the atmosphere and perceive the tone ...
dupontelle wrote:If we do not take into account rainwater and only discharges, there are therefore 1,5 detergents per m3 of water in the treatment plant.
Modern WWTPs are not supposed to harvest EP, even if connections "guaranteed to be 100% free of parasites" exist only in Bouygues' dreams ...
dupontelle wrote:I do not think that this rate is at the origin of such a toxicity.
Does anyone know the rate at which a detergent becomes toxic?
Thank you
A modern machine consumes about 50 l per wash, but part of it is very lightly charged water, from the second rinse ...
Finally if we start on 50 l, that makes 75 l of detergent for 1000 l of EU, a dilution rate of 13, lower than what mentioned in the article.