At 08:47 07/04/19, Digest Number 2089 wrote:
> Posted by: "Adam Seychell" a_seychell@... a_seychell
> Date: Wed Apr 18, 2007 2:40 pm ((PDT))
>
>Len Warner wrote:
> > Do not use anything which looks like a food container
> > (and especially a soft drink bottle) particularly if you
> > expect small children to be around and even if you don't ;-)
>
>And thats why you label your containers, with poison signs.
Unless the folk in your neighbourhood are exceptionally gifted,
small children don't read - but the do recognize shapes and
they do investigate many things by putting them in their mouth.
> > I would recommend neutralizing your effluent with a small
> > excess of garden lime and immobilizing the precipitate
> > by the addition of a little cement. ...
>
>Yes, if end goal of the OP was to ditch the etchant, then I'd agree
>completely. "pcb.easy" seemed to be asking how to collect and store Cu(OH)2.
I understand that, and I'm suggesting that he _should_not_ store it
in its pure form unless he has a purpose for it (which he seemed not
to have, and be at the moment rather lacking in the detailed knowledge
of chemistry required to accomplish such purpose) - rather, he
should render it relatively inert and safe until a suitable opportunity
arises for its disposal.
> Posted by: "pcb.easy" rpdavidson@... pcb.easy
> Date: Wed Apr 18, 2007 9:43 pm ((PDT))
>
>My goal is not to collect and store Cu(OH)2, but rather reduce the
>waste by removing the excess water.
It is also a very good idea not to flush metallic contamination into
the water system, unless in exceedingly small amounts.
>The reason for wanting to reduce
>the waste is so that I do not have a large volume of chemicals on
>hand, and do not have to make frequent trips to the hazard waste
>facility.
Yes, but you make those that you have more concentrated
and possibly more hazardous, e.g. by ingestion.
>I can not see how taking a small amount of copper hydroxide
>and contaminating a chunk of concrete and having it buried in a
>landfill is benifical.
It isn't - neither is it very detrimental. This has been discussed
here briefly before.
>Have you seen how they crush and grind
>everything that goes into a landfill.
They don't seem to do that much here - the landfill I used to pass
every working day had recognizable rubbish bags and household
waste items being rolled into its surface. They may be more
discerning of late.
In any case, it doesn't matter: we are talking _small_ amounts
and it will be bound in the concrete matrix, so even if
crushed it won't leach out in large quantities.
>Rather I would like to take it
>to a hazard waste facility and have it properly dealt with.
And until you do, I would rather you didn't have any accidents with it.
>If I was
>willing to have the copper dumped into a landfill and have it
>eventually work it way into the water supply, I might as well pour it
>down the drain.
No, because then it kills the bacteria in the sewage works.
It's not the same as dispersing it in a large amount of solid waste.
Regards, LenW