Bod Reduction

FIG. 7.35.8 Activated-sludge wastewater treatment of a paper mill in Fors, Sweden upgraded with four VENTOXAL oxygen injectors.

COST SUMMARY OF THE WASTEWATER TREATMENT PLANT UPGRADE AND ITS ANNUAL OPERATION AT A PAPER MILL IN FORS, SWEDEN

Cost of Plant Upgrade: Four VENTOXAL units, installed

(including control panels) Second sludge dewatering unit Total

Annual Operating Costs: Amortization (5 yr/12% interest) Oxygen (1512 metric tn @$86/tn) Energy (500,000 kWh @7i/kWh) (0.33 kWh/kg O2) Operation and maintenance Chemical credit (sedimentation) (1589 - 1113 = 476 metric ton @ $250/tn) Total

$150,000

$100,000 $250,000

$138,000

Extra BOD Removal: 3319 kg/day;

1162 metric tn/yr @ $120/metric tn BOD removed

Source: Matson and Weinzaepfel, 1992.

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