The survey also showed that U.S. NTF facilities are operating under conservative loading conditions. ... These values compare to plateau nitrification rates in the USEPA process design manual (Parker et al. , 1975) of 0.83 to 1.5 gN/m .d ... occurred in an upstream activated sludge step where it should have been possible to produce very low BOD and SS levels as ... Biofilm predators (filter fly larvae and snails) had occurred in pilot NTFs and materially reduced nitrification rates (Boileranbsp;...
|Title||:||Technical Advances in Biofilm Reactors|
|Author||:||International Association on Water Pollution Research and Control|
|Publisher||:||Pergamon - 1990|