Bioaugmentation to improve nitrification in activated sludge treatment.

摘要: Bioaugmentation is a proposed technique to improve nutrient removal in municipal wastewater treatment. Compared with commonly used nitrification/denitrification (NDN) processes, bioaugmentation may be able reduce tankage or land requirements. Many approaches for have been developed, but few studies compared the benefits among different approaches. This paper quantifies effectiveness of processes and investigates three major "onsite" alternatives: 1) parallel-plants approach, which uses acclimated biomass grown nitrifying "long-SRT" (sludge retention time) plant augment low-SRT treatment plant; 2) enricher-reactor an offline reactor produce augmentation cultures; 3) enricher-reactor/return activated sludge (ER-RAS) grows enrichment culture reaeration that receives portion recycle sludge. Kinetic models were developed simulate each various are presented on same basis controllable parameters, such as levels, aeration tank volume, temperatures. Examples given illustrate potential by upgrading "carbon-only" nitrification. Simulation results suggested all can decrease minimum SRT The approach creates highest concentration fail at too low temperature. ER-RAS likely would more useful lower temperature required less volume; advantageous presence inhibitory compound(s).