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  #21  
Old 04.08.2020, 08:53
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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Too much phosphorus dumped into the lake...probably from detergents... these bacteria are multiplicate on phosphorus...
I assume you have evidence to back this up?
Please provide it.
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Old 04.08.2020, 10:08
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

Simple search.

https://cen.acs.org/articles/94/i12/...-way-tame.html

Thanks, Flying, for bringing it up.
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Old 04.08.2020, 10:40
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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Simple search.

https://cen.acs.org/articles/94/i12/...-way-tame.html

Thanks, Flying, for bringing it up.
Oh I know about the science behind it all and possible causes, I was referring specifically to this outbreak in Neuchâtel.

I assume Flying Kite has some evidence that phosphorous from detergents was the cause here. If so it would be good if he could provide it because I can’t find anything to that effect.
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Old 04.08.2020, 19:34
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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Too much phosphorus dumped into the lake...probably from detergents... these bacteria are multiplicate on phosphorus...

I'd look first at the most obvious phosphorus source: farm animal manure. Farmers usually manage manure in a proper way, but accidents might happen anyway. Cantonal authorities should already be looking at L'Areuse water quality.
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Old 04.08.2020, 21:31
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

out of interest, what do you call 'in a proper way?'
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Old 04.08.2020, 21:33
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

Could be from fertilizers...but this is used always...my theory: just increases in sanitizers use in special in area with many hospitals...as the sewage treatment plant use the same amount of catalysis substance before the increase...could be that amount of the Phosphorus prevail...this is just an assumption on the cause and effect theory...
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Old 05.08.2020, 09:44
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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out of interest, what do you call 'in a proper way?'
All this is my speculation. I know a bit about water, that's it Human waste water treatment is closely monitored around here, a manageable number of waster water treatment plants. Thus I don't think detergents might be the main cause for eutrophication in surface water. The management of animal manure on the other hand is harder to follow because there's farms everywhere. I don't presume bad faith but simply that a more complex process is more vulnerable to mistakes.

So, the first step is don't add too much supplemental P to cattle feed. Too much phosphorus means cattle let it pass undigested to manure.

Then comes the collection of manure from barns. It's impossible to recover 100% from it, but the goal is to collect the most. Any uncollected manure can be transported by rainfall runoff to the closest water stream.

Next let it be degraded by bacteria: (i) in tanks to recover methane (lots of farms around here have this system), or (ii) in opens ponds, or (iii) let it dry. Risks: system capacity and once again the rainfall. If rainfall makes a pond or a storage site overflow....big problem :/

Finally spread it on fields. The only risk is spreading too much on the same site.
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Old 05.08.2020, 10:11
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

have there been any updates on the situation?
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Old 05.08.2020, 10:22
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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have there been any updates on the situation?
Aug 3: the link between cyanobacteria and dog intoxication is probable but not confirmed. The swimming ban on canton NE is still on place. The rainfall from last weekend and lower air temps may have slowed down the cyanobacteria growth but cantons VD, FR and NE are still assessing the situation. An update is expected later this week.

https://twitter.com/polneuch/status/1290316892067049473

https://www.ne.ch/autorites/DJSC/PON...%A2teloise.pdf
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Old 05.08.2020, 11:53
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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Too much phosphorus dumped into the lake...probably from detergents... these bacteria are multiplicate on phosphorus...

except that this has been made illegal a long time ago.
https://www.parlament.ch/de/ratsbetr...airId=20043320
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  #31  
Old 05.08.2020, 11:58
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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except that this has been made illegal a long time ago.
https://www.parlament.ch/de/ratsbetr...airId=20043320
Exactly! That’s why I was interested to know if he had any evidence for it or if it was just him hypothesising.
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Old 05.08.2020, 12:13
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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Exactly! That’s why I was interested to know if he had any evidence for it or if it was just him hypothesising.

Typing faster than thinking, maybe.
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Old 05.08.2020, 15:21
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

Bathing is now allowed everywhere in lake Neuchâtel again.
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  #34  
Old 05.08.2020, 15:24
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

Great news- but I will always favour the south shore which is much cleaner and no duck fleas.
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Old 05.08.2020, 15:40
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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Bathing is now allowed everywhere in lake Neuchâtel again.
And did they find out/publish what the problem was?
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  #36  
Old 05.08.2020, 15:53
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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And did they find out/publish what the problem was?
It was confirmed as Cyanobacteria limited to a specific area and almost certainly as a result of the very hot weather and the shallow, stagnant water in that area.
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Old 05.08.2020, 15:58
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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And did they find out/publish what the problem was?
Once again the twitter of the Police Neuchâteloise:

https://twitter.com/polneuch?lang=en

https://www.ne.ch/autorites/DJSC/PON..._cp_commun.pdf

As summary, the water samples they have taken in the lake showed no toxins produced by cyanobacteria at a risky level. It's probable that the recent rainfalls changed the previous conditions. There's still in place a recommendation to NOT swim in stagnant waters after several hot days, since these are the conditions where cyanobacteria grows. The analysis of dead dogs continues searching the conclusive proof to determine if the dogs effectively died due to cyanobacteria toxins, this will take several more days.

PS, the police twitter is mainly to see people speeding or crashing their cars in stupid ways while being recorded by the police, but it also helpful for other things
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Old 07.08.2020, 00:44
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

There is no smoke without fire...I will not risk swimming there, if...
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