Bioaugmentation to Improve Oxygen Delivery Results

Many times oxygen is injected to improve natural attenuation of petroleum and other contaminants.  The results are often less than expected because the beneficial microbes that the oxygen addition is supposed to stimulate are absent or insufficient in numbers.  Bioaugmentation has been used to improve the results once the oxygen levels have increased but failed to improve the remediation rate.

The following table shows the results of Petrox bioaugmentation at a site in New Hampshire where the operation of an iSOC oxygen-delivery system failed to achieve stimulated bioremediation.  The table shows the improvement of the degradation rates and the achievement of reaching remediation goals.

Contaminant	Pre-iSOC	After iSOC Installation		After Petrox Application
	3/19/2002	1/9/2003	11/29/2004	2/9/2005	4/22/2005
Benzene	33	34	163	27	<2
Toluene	36	13	143	13	<2
Ethylbenzene	130	29	167	29	<2
Total Xylenes	500	141	336	109	<2
MTBE	60	24	61	35	1
Naphthalene	320	196	58	17	<2
1,2,4-Trimethylbenzene	110	40	238	110	<2
1,3,5-Trimethylbenzene	54	29	25	16	<2