April 22, 2021

Noon – 1pm

Participants will receive 1 Professional Development Hour.

Please register for the Webinar at  https://rowan.webex.com/rowan/onstage/g.php?MTID=e556e7b142826907aa25d87b2f1406d94

IN-SITU SEDIMENT REMEDIATION WITH ULTRASOUND AND OZONE NANOBUBBLES

According to the US EPA’s assessment, sediment contamination exists in some locations in every region of the country and causes significant environmental damage and health risks. The ex-situ treatment methods for contaminated river sediments are not always feasible, requiring a low-cost in-situ treatment technology to remediate the contaminated sediments. Hence, this research evaluated the feasibility of in-situ sediment remediation of contaminated sediments using ultrasound and ozone nanobubbles. Ultrasound desorbs contaminants and keeps the sediments in suspension. The ozone oxidizes the desorbed chemicals, while nanobubbles enhance ozone availability. The extracted wastewater is treated utilizing nanofiltration and subsequent precipitation before recirculating through the treatment process.

A set of laboratory-scale experiments were performed using simulated dredged sediments to identify the impact of sonication time and sonication power with nano ozone. The successful implementation of this research will enable applying this concept to remediate most of the regional contaminated sediments sites. Further, this treatment method can be easily implemented for contaminated hot spot treatment.