The initial H₂S readings from the sour water vessel exceeded 80,000 ppm (8.0%). A 20% FQE H₂S Scavenger mixture in water was prepared and pumped into the tank. The tank contents were circulated for 48 hours to ensure good contact was made between the vessel water and the FQE H₂S Scavenger. The tank contents were sampled every two hours with the H₂S being reported at 0 ppm after 32 hours. Prior to the hydrogen sulfide treatment, the vessel was treated with FQE Ammonia Odor for ammonia control. The required amount of FQE Ammonia Odor was pumped into the tank and the vessel contents were circulated for 12 hours until the ammonia level was below the acceptable 10 ppm.

The chemical circulation was performed at an ambient temperature and was applied from bottom to top through a 3D nozzle mounted through the vessel’s top manway access. The spray nozzle was used to eliminate the high H₂S and ammonia concentrations present in the vessel’s head space. Upon completion, the treated water was processed through the wastewater treatment plant without delays.

Typically, this process is conducted by the slow addition of a strong oxidizing liquid over a 7-10 day period of time, resulting in extra time and additional disposal considerations being required.