9420.pdf
9420.pdf
9420.pdf
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Table 7.4 Assumptions used for Economic Analysis (continued)<br />
EVALUATED MODIFICATIONS<br />
Assumed Reduction of<br />
,<br />
Effluent Water<br />
Modification Contaminant Consumption<br />
Concentration<br />
[%]<br />
[%]<br />
Replacement of the 600 um screens with 500 ~m 5 0<br />
screens;<br />
Replacement of the 600 pm screens with 150 ~m 20 0<br />
screens;<br />
Installation of DAF (without improved screening); 80 0<br />
In-house modifications without upgrading of the o 50<br />
treatment system;<br />
In-house modifications and replacement of the 5 50<br />
600 pm screens with 500 ~m screens;<br />
In-house modifications and replacement of the 20 50<br />
600 Pm screens with 150 pm screens; and<br />
In-house modifications and installation of DAF 80 50<br />
(without improved screening).<br />
$156,000 to $169,000. Installation of DAF without prior in-house modifications would<br />
result in more than twice the annual expenditures of any of the previously discussed<br />
changes. Due to the smaller equipment requirements, the annual expenditures for DAF<br />
during the amortization period is reduced if in-house modifications are carried out first.<br />
After the amortization period the lowest annual expenditures would be expected for inhouse<br />
modifications and installation of finer screens, followed by in-house modifications<br />
alone. These modifications would result in a reduction of the annual expenditures by a<br />
factor of at least two, compared to the expenditures which would be required if the status’<br />
102<br />
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