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The spill highlights the ongoing issue of BOD surplus in the harbor, primarily caused by paper mills and harbor deepening projects.

Officials use underwater cones to inject oxygen back into the river, but their effectiveness is sometimes limited by maintenance needs.

When one aerator was taken offline at Savannah's Wilshire Water Reclamation Facility (WRF) to undergo maintenance on Sept. 25, the second one could not keep up. As a result, about 8.7 million gallons of treated wastewater were discharged into the Savannah River Harbor under the Talmadge Bridge with a slightly elevated Biochemical Oxygen Demand (BOD) by 1.5%, according to the city's Oct. 1 press release .

BOD indicates how much organic matter is present in water. The more organic matter in a body of wa

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