Our Air Stripper is not treating 80 ppb of benzene, is this common?

We have a stripper at a remediation site and, at this moment, we have low concentrations (like 80 ppb) of benzene. The stripper does not treat this concentration (we have BTEX and Naphthalene in the groundwater). Is this common?

Using the particulars of your air stripper we will use the Modeler to verify design performance. If that is ok, then we need to look at the operating conditions of your air stripper. Perhaps some maintenance or cleaning is needed to bring the air stripper up to optimum performance. Naphthalene in high concentrations can partition the benzene and prevent some of it from being stripped. It is best to get a number of data sets, if possible, and look for changes over time as this sometimes suggests causes. Another thing to look for is one parameter that is not meeting the prediction, while others are; any of the performance issues with a stripper, like air or water leaks, etc. will tend to be applied evenly over all the contaminants. Conversely, free phase product issues often affect contaminants in different ways.