in the presence of ammonia, chlorine reacts to form chlroamines, (mono, di,
and trichloramine; not ammonium chloride). They moni and di form has got
significant disinfecting power but are still about much poorer than chlorine
(HOCL). As such, a longer contact time is needed.
i am not sure what is the extent of the problem. But to do a good job, in
depth studies on the residence time of the system, reaction kinetics etc are
required to obtain the right dosage.
philip
"Michael Witty" <mw132 at mole.bio.cam.ac.uk> wrote in message
news:Pine.SGI.4.33.0205021033150.637209-100000 at mole.bio.cam.ac.uk...
> On Wed, 1 May 2002, Philip wrote:
>> > u are right. u will need a much longer contact time to achieve the same
> > bacteria kill. i can't give a figure off hand, but i guess it will be in
the
> > order of 100 times that of chlorine.
> >
> > try some references from water supply/ environmental engineering. u
might
> > have better luck posting to the civil or chemical engr newgp.
>> . . . is this because the chlorine exists partly as ammonium chloride and
> in that form is less good at killing? Does the original poster actually
> have a pathogen problem? Can he do some small scale testing? Regards,
> Mike.
>
