Nitrified landfill leachate could be denitrified in the landfill bioreactor with maximum total oxidizing nitrogen removal rate of 67.2 g N t−1 TSwaste d−1.
The maximum increase in total nitrogen was observed in agitated pile of BRS (83.5 %) followed by IS (64.1 %), AS (43.4 %) and BLS (40.0 %).
During the adaptation stage, with a nitrogen loading rate of 0.34 g L−1 d−1, a hydraulic retention time of 1.24 d and an influent COD/N ratio of 2.63 ± 0.02, a maximum ammonia and total nitrogen removal of 100% and 91.68% were achieved, respectively.
Through properly adjusting the influent surface loading (or HRT) and CH4 surface loading whilst maintaining a sufficient biofilm thickness at a suitable influent As III)/NO3− ratio, the maximum removal efficiencies of total nitrogen and As III) could both reach above 95.0%, accompanied by a high CH4 utilization efficiency of up to 99.0%.
The silicate content was higher than that of all other nutrients except the total nitrogen registering maximum during November 2014 8.8766 μM/l).
However, during the subsequent sampling, there was a gradual increment of total nitrogen, the maximum value being recorded at the 100th day.
A central composite design (CCD) was used to obtain a model describing the relationship between glucose, total nitrogen, and the maximum cell dry weight in the culture broth with fed batch fermentation in a 5 L fermentor.
The sensitivity analysis has been done to identify the parameters having maximum influence on the DO, CBODf, TC, and total nitrogen (TN) output.
When the SRT was decreased to 50 d, the sludge concentration declined gradually, which necessitated an increase in the sludge loading rate (SLR), and the maximum sludge nitrogen removal rate (SNRR) of 0.67 g total nitrogen (TN /g VSS/d was achieved at this time.
