(Figure 3a and 3b) are positively related to the experimentation time. For the NH3-N, NH4 and PO4 concentration in inputs, the correlation coefficients are 0.7732 (P = 0.0713), 0.7892 (P = 0.0620) and 0.8537 (P = 0.0305), respectively,indicating a moderately strong relationship between these variables and time. The NO2 and NO3- concentrations in HB were consistently increased throughout the experiment.