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Biological Nutrient Removal (BNR) process removes total nitrogen (TN) and total phosphorus (TP) from wastewater through the use of microorganisms under different environmental conditions in the treatment process.
The Dual Sludge System (DSS) technology employs two consecutive fully-independent sludge systems. The first sludge system is usually CAS (conventional activated sludge) followed by CAS or MBR (Membrane Bio-Reactor) system.
MBR (Membrane Bio-Reactor) is a profound technology, dating back to the late 70's, which combines secondary and tertiary treatment by activated sludge and UF (Ultra-Filtration) membranes for absolute solids/liquid separation.