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How Your Dung is Wrung
Project Name : How Your Dung is Wrung
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How Your Dung is Wrung
Preliminary Sewage Treatment

    Each day, from every house and business, floods 11.3 millions gallons of waste to the wastewater treatment facility. Upon its arrival at the facility, the waste contains much more than the treatable inorganic matter. These inorganic items, such as tampons, hair, condoms, corn, toothbrushes and Q-tips, are removed.

Primary Sewage Treatment

    At this stage in the epic saga of the waste, the water gets a chance to settle. Organic matter -- fats, oils and greases -- is removed by a pump to a blending tank. FeCL3 is added to the process, minimizing any H2S buildup. This removal of the biodegradable substances removes approximately 60 percent of the original BOD.
Secondary Sewage Treatment INCOMPLETE

The secondary stage of the process of sewage treatment involves the process of activated sludge. Within aeration basins, organisms are removed. Biological oxygen is used to substainally break down organic material. There is a surplus of biological oxygen to keep the organisms alive that are used to consume biodegradable soluble organic contaminants. For every one pound of food, there are four pounds of bacteria to complete the process.

Tertiary Treatment

   At this point, the turbidity of the water is tested. Tertiary treatment is the process through which the remaining water and waste is filtered through four feet of sand at a rate of 4,000 gallons per minute. Water floods under the filter, and then sand is pulled up through it in a backwash filter filter.

Quaternary Treatment   

    The bacteria in the waste solution is finally removed at this stage when chlorine is added and all that is left is oxidized. Sodium disulfate is finally added before the water is discharged to either a creek leading to the Santa Ana Riverbed or to resevoirs.