Compositions for bioremediation and methods for using

1. A composition comprising a methyl ester of a fatty acid and a bioremediation reagent, where the bioremediation reagent is an acyl glycerol, and where said composition is capable of supporting the growth of a microbial population in the presence of an electron acceptor.

2. The composition of claim 1 wherein the methyl ester of the fatty acid is an oil derivative.

3. The composition of claim 2 wherein the oil is a vegetable oil.

4. The composition of claim 1 wherein the methyl ester of the fatty acid comprises C 18 fatty acid esters.

5. The composition of claim 1 wherein the methyl ester of the fatty acid comprises at least about a 50% C 18 fatty acid ester fraction.

6. The composition of claim 1 wherein the methyl ester of the fatty acid comprises at least about an 80% C 18 fatty acid ester fraction.

7. The composition of claim 1 wherein the methyl ester of the fatty acid comprises no more than about a 25% saturated fatty acid ester fraction.

8. The composition of claim 1 wherein the methyl ester of the fatty acid comprises no more than about a 15% saturated fatty acid ester fraction.

9. The composition of claim 1 wherein the acyl glycerol is a vegetable oil or a derivative of a vegetable oil.

10. The composition of claim 1 wherein the bioremediation reagent comprises at least about a 50% C 18 fatty acid fraction.

11. The composition of claim 1 wherein the bioremediation reagent comprises at least about an 80% C 18 fatty acid fraction.

12. The composition of claim 1 wherein the bioremediation reagent comprises no more than about a 25% saturated fatty acid fraction.

13. The composition of claim 1 wherein the bioremediation reagent comprises no more than about a 15% saturated fatty acid fraction.

14. The composition of claim 1 wherein the methyl ester of the fatty acid is a derivative of a first vegetable oil and the bioremediation reagent is a second vegetable oil or a derivative of a second vegetable oil.

15. The composition of claim 14 wherein the first and second vegetable oils are different.

16. The composition of claim 14 wherein the first and second vegetable oils are the same.

17. The composition of claim 1 wherein at least one of the methyl ester, the bioremediation reagent, or the composition is emulsified.

18. The composition of claim 1 adapted for administration to a site comprising a contamination.

19. The composition of claim 18 where the site is subsurface.

20. The composition of claim 18 where the site is a subsurface groundwater site.

21. The composition of claim 1 wherein the microbial population is present in an aquifer or vadose zone and the composition is capable of supporting the growth of the microbial population.

22. The composition of claim 1 wherein the ratio of the methyl ester of the fatty acid to the bioremediation reagent is in the range from about 1:99 to about 25:75.

23. The composition of claim 1 wherein the ratio of the methyl ester of the fatty acid to the bioremediation reagent is in the range from about 5:95 to about 15:85.

24. A method for in situ remediation of a contamination in an aquifer or vadose zone, the method comprising the step of contacting the composition of claim 1 with the contamination in the aquifer or vadose zone in an amount effective to sustain a population of anaerobic bacteria in the aquifer or vadose zone.

25. The method of claim 24 wherein the contamination comprises an organic solvent.

26. The method of claim 24 wherein the contamination comprises a chlorinated organic solvent.

27. The method of claim 24 wherein the contamination comprises an inorganic nitrogen or inorganic sulfur compound.

28. The method of claim 24 wherein the contamination comprises an organic nitrogen compound.

29. The method of claim 24 wherein the population of anaerobic bacteria is naturally occurring in the aquifer or vadose zone.

30. The method of claim 24 further comprising the step of introducing a population of anaerobic bacteria in the aquifer or vadose zone.