Bacterial efficiency

[zygote2k]

Has there been and research done on the efficiency of any of the bacterial reactors that are currently being sold?

We have bio-pellets, fluidized beds, kaldnes reactors, zeovit, etc. 

I'm looking for some sort of data that shows if you have "x" amount of nitrate and phosphate, that "y" amount of bio-material will reduce "x" amount of N/P given a certain amount of flow over a certain time period will reduce N/P levels to zero.