Biological Nutrient Removal (BNR) is a term that refers to the process of removing nutrients from the environment (typically nitrogen and phosphorus in wastewater).
BOD stands for Biochemical Oxygen Demand.
When compared to BNR, ENR - Enhanced Nutrient Removal - provides a higher level of treatment.
F/M is the food-to-microorganism ratio.
MCRT stands for Mean Cell Residence Time.
MLSS stands for Mixed Liquor Suspended Solids.
MLVSS is an abbreviation for Mixed Liquor Volatile Suspended Solids.
NH3-N – Ammonia nitrogen in wastewater formula.
NO2 – Nitrite in wastewater formula.
NO3 – Nitrate in wastewater formula.
SBR stands for Sequential Batch Reactor, a type of activated sludge treatment system that treats wastewater in batches.
Sludge Age – The theoretical age of the solids in the system under aeration, calculated in the same way as MCRT.
The Sludge Volume Index (SVI) is a metric that shows how likely activated sludge solids (aerated solids) are to thicken or concentrate during the sedimentation/thickening process.
Total Nitrogen is abbreviated as TN.
WAS stands for Waste Activated Sludge, and it refers to the amount of sludge (or bio solids) that is removed or wasted from the system.
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