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Over 100 biosurfactant-producing microorganisms were isolated from oily sludge and petroleum-contaminated soil from Shengli oil field in north China. Sixteen of the bacterial isolates produced biosurfactants and reduced the surface tension of the growth medium from 71 to <30mNm −1 after 72h of growth. These bacteria were used to treat oily sludge and the recovery efficiencies of oil from...
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