The percent for the same wastewater composition 85.4% decolorization
was obtained in system 2 after adding the forest residue
solution, compared to 78.8% in system 1 earlier. Inoculating the
system with a forest residue solution increased the dye removal
capacity for the system.
There was an 82.8% removal after increasing the flowrate
whereas 85.4% of dye removal had been obtained before the
flowrate increase. The flowrate was increased approximately two
fold but the difference between 85.4% and 82.8% was not big in
proportion to flowrate change. Although increasing the flowrate
two fold, dye removal decreased only 3%. It can be concluded that
the biofilters can manage fluctuations as increased flow leading to
reduced residence time with only a slight decrease in decolorization
efficiency.
The results of the microbial process are given in Table 1.