To reduce the chlorine residual of the treated effluent, Sodium Bisulfite is fed just prior to the plant discharge point. An Oxygen Enhancement System is utilized at the CCT area. Liquid Oxygen is vaporized and released during periods of possible low D.O. events such as during the beginning of a high flow event. The Recycle Flow Stabilization facility takes flow from other operating units throughout the facility including overflow from the Primary Gravity Thickeners, Gravity Belt Thickeners, beltfilter pressate from the Compost Facility. These flows are high in suspended solids and phosphates.
Treatment consists of lime addition followed by gravity settling and clarification.
Settled solids are pumped to the Primary Gravity Thickeners while overflows are pumped to the Pre-Aeration influent. The thickened solids are then pumped to the Mixing and Holding Tanks. Gravity belt thickening concentrates conditioned solids through the gravity separation of water and solids on a continuously moving porous horizontal belt. The thickened solids are then pumped to the Mixing and Holding Tanks. Primary and Waste Activated solids are pumped to the Mixing and Holding Tanks and blended together and stored for further processing.