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Serving the Big Bear Area Since 1974

Oxidation Ditches


After screenings and grit removal, the raw sewage flows to the oxidation ditches. These ditches provide optimum growing conditions for “good” bacteria which are responsible for removing the waste in the raw sewage. The raw sewage is “eaten” by the bacteria and used to make more bacteria. This is called “stabilization”. Most of the pathogenic (disease-causing) bacteria in the raw sewage are killed by the “good” bacteria in the oxidation ditches. The stabilization of the raw sewage in the oxidation ditches is the principle step in the wastewater treatment process.

In 2001, we implemented the “Symbio Process”. This is a proprietary process that controls the oxidation to reduce the amount of nitrogen released in our effluent, and lowers the cost to operate the oxidation ditches.

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