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Title: Overview Of Problems And Solutions Associated With Surface Impoundments
Author: Chae E. Laird
Source: American Gas Association 1985
Year Published: 1985
Abstract: Various lypes of surface impoundments (pits) used in the oi! and gas industry are discussed. The clean-up of one such pit heavily contaminated with petroleum products (water column oil and grease &67 mg/1) employed mutant bacteria to digest the oil. Evidence (decrease in n-alkane/branched alkane ratios in surface oil samples) indicated that the mutant bacteria were digesting the oil. but the volume of surface oil was too great for the bacteria to reduce oil and grease concentrations in the entire water column to acceptable levels for discharge (15.0 mg/1) within the one-years time allotted for clean-up. The surface oil was removed mechanically three months before deadline, and bacterial treatment of the pit continued. Oil and grease levels were reduced to below acceptable levels (14.9 mg/1 maximum 9.7 mg/1 average) by the clean-up deadline, but the relative contributions of the mutant bacteria and weathering to the reduction are unknown.

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