Most individual wastewater treatment systems are ineffective

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izentrop
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Most individual wastewater treatment systems are ineffective




by izentrop » 21/09/17, 17:29

In eight out of ten cases, individual wastewater treatment plants are not doing their job https://www.franceinter.fr/societe/les- ... cceptables

Technical summary of the final report - September 2017: http://cemadoc.irstea.fr/exl-php/util/d ... cument.php
And to find your bearings http://www.assainissement-non-collectif ... 1713de.pdf

MES, COD, DBO5 are the desired chemical parameters (no detail)
Nitrogen parameters: it speaks more, the red zone corresponds to NK ≥ 90 mg / L, these are the leachable parts likely to join rivers and water tables, N nitrates and K potash.

It appears that the worst are the micro-stations and the best, the conventional spreading on sand and on planted massif (normal for the plants, that corresponds to the natural cycle).

It is not only agris to pollute the water tables.

On the other hand, it is to be hoped that this study is not a pretext to impose everything on the sewer to everyone.
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Re: Most individual wastewater treatment systems are ineffective




by Christophe » 21/09/17, 17:39

All the better, it's very good to say it, because I always considered the micro-station of purification like a politico-environmental scam !!
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Re: Most individual wastewater treatment systems are ineffective




by izentrop » 21/09/17, 18:17

The link on the study does not work that way, download it here
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Re: Most individual wastewater treatment systems are ineffective




by Grelinette » 22/09/17, 11:21

Hello,

I find it difficult to have an opinion on this question, especially since there is perhaps behind this study, and as you point out "a pretext to impose the whole to the sewer on everyone" .

On the one hand, with the individual systems, the waste water is treated locally (generally conventional system: grease trap, pit, spreading or micro-purification station),
on the other we connect to the All-in-the-Egg (TAE) and we send everything in the network.
It's fast and simple ... and we sleep on his 2 ears.

That being said, in my commune there was an awareness campaign for the connection to the TAE of the individual houses with the construction of a new treatment plant in the bottom of a valley ... but that does not seem to have calmed the debate because it turns out that the treatment plant is not sufficient, and residents of the station complain of odors, and downstream of the station water tables and water sources would now polluted ...

I am not a specialist, but can we really say that wastewater that is concentrated and treated in wastewater treatment plants generally generates less pollution than wastewater treated locally?

Certainly the question raised is different, namely that the study points to the inefficiency of individual wastewater treatment systemsbut an individual treatment system is very simple: after the pit, it is basic pvc piping and banal spreading.

The whole question is finally to know what happens to polluting household products!
Like it or not, whether these polluting substances stay with the person who produced them or that they are centralized in a station, they remain polluting and concentrate at the last stage of the treatment.

I ask myself whether it is better to concentrate the polluting substances in a place (the treatment plant) knowing that after it is necessary to manage, store or re-use (*) these loaded industrial sludge from the stations , or allow these substances to remain scattered among the individuals who produced them!

It is a bit like the current debate on nuclear waste that the inhabitants of BURE do not want to see centralized and stored at home ...

(*) A few years ago, a farmer who hailed my animals told me that he was receiving subsidies to spread industrial sludge from his wastewater treatment plants on his land, a very effective fertilizer according to him. ! ... : Shock:
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Re: Most individual wastewater treatment systems are ineffective




by Ahmed » 22/09/17, 12:49

The real concern is that it is possible to produce a lot of chemicals without first asking the question of their fate after use, which makes their presence in water to treat very problematic, whether at the level of the individual or that of the community.
Collective treatment is easier to manage, but the network is rarely up to standard (huge investments), so that during storms, treatment is no longer really assured (load shedding). In the individual the different waters are easier to separate, but the treatment remains summary (in particular, influence of seasonality) ...
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Re: Most individual wastewater treatment systems are ineffective




by Christophe » 22/09/17, 16:20

izentrop wrote:The link on the study does not work that way, download it here


Even following this link, I can not find the study you are referring to ... What is its exact name?

Otherwise, if you have the .pdf, you can maybe host it on the forums?
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Re: Most individual wastewater treatment systems are ineffective




by izentrop » 22/09/17, 17:05

Downloads
ly2017-pub00054553.pdf.pdf
(544.82 KB) Downloaded times 756
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