Heating Up in the Summer
The biological process consists of a Schreiber CSR system—a BNR system contained in a single basin. The CSR continuously sequences through the oxic, anoxic and anaerobic cycles. After the anaerobic cycle is complete and the next oxic phase begins, the system takes advantage of “luxury uptake” of phosphorus to reduce the amount of soluble phosphorus. Side benefits of the Schreiber CSR system include energy savings of 30% or more from 100% aeration turndown capability, low-energy mixing—2.5–3.5 hp/mg—and adjustable controls and programming with the use of Schreiber’s SchreiberFlex control system.
In order to insure that LASA’s summer phosphorus limit is achieved, Schreiber’s Fuzzy Filters provide tertiary filtration. A high-rate (40+ gpm/sq ft) solids-capture filtration system, the Fuzzy Filter provides solids capture, and thereby any phosphorus contained therein, down to 4-micron particle size. Additionally, the Fuzzy Filter provides long media life (10+ years), low-wash water usage (< 2% on tertiary) and, due to the high rate of filtration, a small footprint (15-20% of the size of sand filters).
“I love the Fuzzy Filter,” said LASA Operator Jack Niemi. “Low maintenance, easy operation, and awesome performance. We have a very strict phosphorus effluent limit, and the Fuzzy Filter has ensured that we stay in compliance.”
Additional Schreiber equipment at the plant includes an aerobic digester/thickener in which the thickener can easily be converted into a clarifier (thus satisfying the state’s requirement for clarifier duality), as well as stationary diffuser assemblies, blowers and control equipment installed in a sludge storage basin.
