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ACRONYMS <br />Acronym Meaning <br />U <br />Recirculation ratio <br />ATU <br />Aerobic treatment unit <br />BOD <br />Biochemical oxygen demand <br />BOD5 <br />Five day biochemical oxygen demand <br />CBOD5 <br />Carbonaceous five day biochemical oxygen demand <br />CFU <br />Colony forming unit <br />COD <br />Chemical oxygen demand <br />CWC <br />California Water Code <br />DF <br />Dosing frequency <br />DO <br />Dissolved oxygen <br />ES <br />Effective size <br />ETV <br />Environmental technology verification <br />FC <br />Fecal coliform <br />HAR <br />Hydraulic application rate <br />HLR <br />Hydraulic loading rate <br />LECA <br />Light expanded clay aggregate <br />LWA <br />Light weight aggregate <br />MPN <br />Most probable number <br />NH3-N <br />Nitrogen as ammonia <br />NO2-N <br />Nitrogen as nitrite <br />NO3-N <br />Nitrogen as nitrate <br />NSF <br />National Sanitation Foundation <br />NTU <br />Nephelometric turbidity units <br />OLR <br />Organic loading rate <br />O&M <br />Operation and maintenance <br />ON <br />Organic nitrogen <br />PBF <br />Packed bed filter <br />PFU <br />Plaque forming unit <br />pH <br />Inverse log concentration of hydrogen ions <br />PLC <br />Programmable logic controller <br />PVC <br />Polyvinyl chloride <br />RF <br />Roughing filter <br />RSF <br />Recirculating sand filter <br />SBR <br />Sequencing batch reactor <br />SRT <br />Solids retention time <br />SWRCB <br />State Water Resources Control Board <br />TC <br />Total coliform <br />Vii <br />