Pesticide Bioremediation – Landfarming Application for DDD, DDE and Toxaphene

Petrox® bioremediation was used to remediate pesticide-contaminated soil at an industrial location in California.

Soil Remediation

The soil contamination consisted of pesticides including 4,4-DDD, 4’4-DDE and toxaphene.  Soil samples were sent to CL Solutions for bench-scale treatability studies.   The following table shows the  maximum detected concentrations and the treatment results.

Contaminant	Untreated Concentrations (ug/Kg)	Post-treatment concentrations (ug/Kg)
4,4-DDD	390	250
4,4-DDE	380	220
Toxaphene	8,500	440

After the bench-scale verification, full-scale bioremediation was implemented.  The contaminated soil was placed in two stockpiles and treated with Petrox. The following table shows the pre- and post-treatment results.

	Contaminant Concentrations (ug/Kg)
Contaminant	Pile 1		Pile 2
	Before	After	Before	After
4,4-DDD	310	170	14	nd ( <5)
4,4-DDE	810	300	8.7	nd  (<5)
Toxaphene	12,000	7,300	380	nd (<5)

Conclusions

The Petrox treatment successfully reduced the concentrations of pesticide contaminants in the soil stockpiles.  For additional information or assessment of applicability to your site contact CL Solutions.