Full Scale Stimulation of Reductive Dechlorination Using the LINER® Technique

Following the results of an earlier pilot study, a full-scale remediation project was undertaken at an operational factory in the Dutch town of Zwolle. Contamination from chlorinated aliphatic hydrocarbons (CAHs) in the source zone was treated using a novel gas injection and nebuliser system called LINER. Ethyl lactate was selected as a carbon substrate to stimulate in-situ bioremediation. It was atomised and injected at a rate of 500ml/day over a 3 minute duration from 6 no injection wells with a total of 12 no injection filters at 24-25 m and 44-45 m depth. The performance of the remediation technique was observed using an array of groundwater monitoring wells. The results are variable with biodegradation to ethene proceeding well at depths of 14–15 m and 44–45 m depth. Limitations in biodegradation were attributed to the variations in stratigraphy and limited zone of influence near the injection points.

• ABSTRACT

• KEYWORDS

• INTRODUCTION

• SITE DESCRIPTION AND HISTORY

• REMEDIATION SYSTEM

• RESULTS and DISCUSSION

• CONCLUSIONS

• ACKNOWLEDGEMENTS

• REFERENCES