Consistent Compliance with Low Level Nutrient Limitations with Extreme Flow and Load Variation Using Small System Membrane Bioreactor

摘要

The performance challenge for an Enhanced Nutrient Removal (ENR) process is in the control of the biology. In the case of large municipal wastewater treatment plants (WWTPs), flow and load variations are typically diurnal. In the case of small systems associated with schools, rest stops, retail complexes, and even shared residential systems; however, flow and load variations are extreme and may have seasonal maximum and minimums lasting for periods of time greater than treatment system bacterial growth and decay cycles. These extremes cause tremendous challenges for process control and stability, as they cause biological stress and make it difficult, if not impossible, for operators to achieve consistent regulatory discharge compliance. Decentralized; Enhanced Nutrient Removal (ENR); Accentuated diurnal flow patterns; turndown capacity.