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Sewage Treatment Plant
Project Name : Sewage Treatment Plant
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Water Treatment Plant
On Wednesday February 22, 2012 we visited Corona's Reclamation Facility and took a tour around the plant. We were taking from each step of water treatment starting with the primary sewage treatment and ending with the quaternary treatment level. Everyday 11.5 million gallons of raw sewage enters the facility containing total suspended solids, trash, and anything else that comes from the sewer.

The first level of sewage treatment is the primary level. This level consists of the removal of trash and solids. The solids are removed from the water by gravity and dividers. Then the sludge left over from the filtration process is transferred to a dryer where it becomes 95% solid and only 5% water. The BOD content and turbidity at this point is extremely high. The only thing that leaves this stage is less contaminated sewage water. This water is not considered safe to use for any specific reason until any further treatment.

The secondary treatment stage takes place in several aeration basins. In these basins aerobic bacteria eats carbohydrates and sugar. These are non soluble substances that keep bacteria alive and hungry for future sewage. The material located in this stage is WAS (Wasted Activated Sludge). This water is now considered recycled water, which is active for the use off irrigation to orchards and vineyards, the recharging of aquifers, and industrial cooling processes.

The tertiary treatment is the third treatment stage in which chemical filtration and disinfection occurs.The liquid is flowed through a sand filtration system. At this point in time, the BOD has dropped to a extremely low level. Turbidity levels have also dropped as well. This water after being treated can be used to water lawns, golf course greens, and other landscapes. Also this water is safe for toilet use, vehicle washing, and for recreational sites.

The Quaternary treatment is the final step in disinfecting the recycled water. The purpose of this stage is to reduce the number of microorganisms that will be discharged into the environment for drinking, bathing, and irrigation. This kills all coliform and intestinal bacteria. This product can be found in parks and school drinking fountains.

Some interesting facts we learned through out this experience was the PH level was 7.1 of the water at the Primary level. Also the detention times in the secondary treatment was 60-90 minutes. The most interesting thing i found out that day was that in the stage where they are Oxidizing the water, if anyone or anything falls in the water will have no buoyancy because of the increased amount of air which cause a higher dissolved oxygen content and lower BOD.