The Zirku wastewater treatment system was originally designed for a fraction of the amount of the people currently living on the island. Due to the daily flow rates and corresponding pond sizes, the hydraulic retention time did not allow for sufficient treatment.
The Moleaer XTB Nanobubble Generator™ was installed adjacent to the primary pond with a recirculation pump. The raw wastewater was pumped through the generator and back into the pond. Despite the warm water temperature, the introduction of nanobubbles was able to raise the dissolved oxygen. Most importantly, the nanobubbles were able to deliver oxygen to the entire water column, especially down to the bottom sludge layer, thus aiding in odor reduction. The presence of the nanobubbles helps boost the biological respiration rate (a.k.a. “SOUR”) of aerobic bacteria and suppresses anaerobic activity that would otherwise be responsible for the production of foul-smelling gases.