THE CASE FOR SIDE-STREAM RAS OR MIXED LIQUOR FERMENTATION TO ENHANCE BIOLOGICAL PHOSPHORUS REMOVAL (EBPR)

摘要

This paper traces the history of EBPR and the theories that developed which in turn influenced the design which in turn selected for phosphate accumulating organisms (PAOs) which we are only now beginning to understand. Standard design of conventional EBPR plants led to the selection of mostly a clade of Accumulibacter that relied on a supply of volatile fatty acids (VFA). Accumulibacter which cannot themselves ferment higher carbon compounds while some of the early plants relied on side-stream fermentation which seemed to perform better. The paper summarizes findings on planned or inadvertent configurations of S2EBPR systems and propose a theory for the compact design of plants to make maximum use of side-stream fermentation that will improve biological phosphorus removal performance.