PROCESS
CONSIDERATIONS
Process consideration
involve factors which affect the choice
of treatment method, its design criteria
and related requirements such as the following
.
a) Waste Water
Flow and Characteristics
This constitutes
the primary data required for process design.
The various parameters to be determined
are described in other sections of this
manual.
b) Degree
of Treatment Required
In case of
domestic or municipal sewage, this is considered,
for example, in terms of removal of BOD/COD,
nutrients (nitrogen and phosphorous ), coliforms,
helminths etc. Land disposal generally has
to meet less stringent discharge standards
than disposal to surface waters. Land disposal
also has the advantage of giving nutrient
removal and is, thus preferred wherever
it is feasible. It is often not enough to
aim only at BOD remival and let other items
be left to unspecified, incidental removal,
whatever may occur. The selction of a treatment
process thus, depends on the extent of removal
efficiency required for all important parameters
and the need to obviate nuisance conditions.
