Wastewater descending through drain called glory hole on its way to secondary aeration tanks at sewage treatment plant in Ohio. Air will be pumped into the water to promote the growth of bacteria, protozoa, rotifers, nematodes, and other microorganisms which eat organic material and help break it down. Sewage treatment is a multi-stage operation that includes physical, chemical, and biological processes to remove contaminates from water.
Model release not required. Property release not required.