Waterjet Placement of Remediation Amendments into Contaminated Sediments

The ability to deliver remediation amendments into contaminated sediments without negatively impacting benthic organisms and their environments has proven to be challenging. The use of waterjets to perform this delivery of remediation amendments at depth is a viable alternative. Waterjets are a viable alternative for placement of remediation amendments at depth. An amendment injection system and waterjet nozzle has been developed to test the merit of this concept. The injection system's performance was assessed by characterizing the distribution of delivered amendments throughout a surrogate sediment test bed. A novel spectrometry method was developed for powdered activated carbon characterization, while granular iron was characterized using two different methods, visual comparison and Inductive Coupled Plasma analysis. Distribution of the placed amendments illustrated similar patterns for a range of injection times and amendment types. However, the depth of injection was dependent upon the type of amendment being injected. The findings of this study has lead to a better understanding on what occurs during an amendment injection, which will aide in and allow for more controlled placement of remediation amendments in the future.