Even with flushing lavatories, different countries have different ideas
about how to install hygienically. In the UK, there is a separate tank
isolated from the mains, to store the quantity of water used in flushing
when you "pull the chain". In contrast, in many parts of the US, water for
flushing comes directly from the mains supply by pressing a lever. The
British idea of a separate cistern is to avoid the possibility of cross
contamination back into the mains supply.
Tony Atkins
Aug 16 2012, Daniel Weihs wrote:
>Sorry Adrian
> I didn't see this when responding to Steve
>
>-----Original Message-----
>From: Engineers and biologists mechanical design list
>[mailto:[log in to unmask]] On Behalf Of Adrian Bowyer
>Sent: Thursday, August 16, 2012 1:07 AM
>To: [log in to unmask]
>Subject: Re: Activity
>
>The last great cholera epidemic in London was in 1866 in the East of the
>city, which was not yet connected to Bazalgette's new sewers. The disease
>was virtually absent in the areas with mains drainage.
>
>A good way to catch cholera today, if you want to, is to eat a salad in a
>country without a proper sewage system.
>
>A flush lavatory piped to a sewage works is not the safest solution to the
>problem because it is the most ecologically sound alternative. It is the
>safest solution to the problem because it can be completely successfully
>owned and used by idiots. Therein lies the challenge...
>
>Best wishes
>
>Adrian
>
>Dr Adrian Bowyer
>http://adrianbowyer.net
>http://reprap.org
>
>
>On 15/08/12 21:22, Julian Vincent wrote:
>> Paris used to be a net exporter of horticultural produce fed by the night
> soil which was collected every morning. London the same. There are still
> holes in the wall in the back lanes around Bath where the night soil
> collectors would ply their trade. Far more sensible than current
> practise. There was never such a thing as a waste product or waste stream
> - just a resource which was unexploited. Only by exploiting such streams
> can we hope to preserve our way of life.
>>
>> Julian
>>
>>
>> On 15 Aug 2012, at 21:12, Steven Vogel wrote:
>>
>>> Much about the matter in the issue of Science that I received today - 10
>Aug issue. Not, perhaps, the last word on the final matter.
>>>
>>> Steve Vogel
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From:
>>> "Engineers and biologists mechanical design list"
>>> <[log in to unmask]>
>>>
>>> To:
>>> <[log in to unmask]>
>>> Cc:
>>>
>>> Sent:
>>> Wed, 15 Aug 2012 20:06:14 +0100
>>> Subject:
>>> Re: Activity
>>>
>>>
>>> Beto, check out http://www.bbc.co.uk/news/technology-19271061 that
> describes the "Reinvent the Toilet" fair which "challenged inventors to
> come up with a toilet that operated without running water, electricity or
> a septic system. It needed to operate at a cost of no more than five
> cents (3p) a day and would ideally capture energy or other resources."
>
--
=3D
|