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PLAIN TRUTH
Jonuory
1973
SLUDGE
from the bottom of sedimento–
tion ponds is processed by wet oxidotion
ond then dewotered by vocuum flltrotion.
The flnal product (below) is a rich soil
conditioner earthy in odor ond nontoxic
to plant growth. lt is free from diseose–
cousing agents ond can be hondled
freely. Phosphate drying beds (left) are
port of the tertiory process.
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