Integrated
Odour Removal and Waste Water Treatment
As a result of their involvement
with landfill leachates and
the successful integration between the waste water treatment
and the dust and odour removal scrubbing process (which was
part of a transfer station for household type wastes and which
was referred to in the Solid Wastes
section) RPA has maintained an interest in the biodegradability
of the more complex and/or refractory organics that are associated
with some difficult odours, with some leachates and with some
industrial waste waters.
One of the key features of the integration between the odour
control system and the effluent treatment process was that
it was possible to arrange for the scrubbing fluid always
to have a high bio-activity, irrespective of the odour load.
This meant that whenever there was a sudden release of odour
from a particular load of refuse, the odour would always be
taken out, unless the odour resulted from a species that had
not been present for some time (or at all) within the leachate
from the rest of the wastes.
In the situation where a suitable integration with an associated
waste water treatment is not feasible or not adequate, RPA
have evolved techniques whereby a combination of processes
can produce adequate odour removal without incurring excessive
reagent consumption costs. These techniques are not universally
applicable, but they do considerably extend the range of application.
One of the techniques involves the use of specific augmentation
of the waste water treatment processes using proprietary bioactive/bio-enhancing
additives. Unfortunately, many of these augmentations achieve
little more benefit than would be achieved by proper attention
to appropriate design details and operating controls. However,
RPA have identified additives, which are particularly effective
in the lagoon environment for breaking down refractory COD’s,
for removing odours and for both the reduction in sludge production
and the digestion of existing sludges within operating lagoons.
These have been effective in a number of areas where naturally
developed bio-populations have become very slow and/or other
additives have been inadequate
In relation to these additives, RPA’s experience has
been with:-
- lagoons and sludge residues containing effluents and residues
from coke ovens and coal tar processing
- lagoon and sludge residues containing mineral oils and
animal fats in the presence of large concentrations of heavy
metals
- lagoons with high ammonia, cyanide and ammoniacal nitrogen
contents
- lagoons with high levels (from an odour production point
of view) of organic sulphur compounds.
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