The research examined and discussed the effect of different types
of NB injections in STWW leading to the following key conclusions:
The quantity of chlorine necessary for the chlorination process
is reduced when NBs are injected into secondary treated effluent.
The first-order model equation accurately describes chlorine
degradation in all of the investigated STWWs under different NB injections.
The residual chlorine decays more quickly in the bare STWW
samples than in those that had received different NB injections.
The rate of residual chlorine degradation is significantly influenced
by the initial residual chlorine concentration.
The degradation rates of residual chlorine were inversely
correlated to the initial residual chlorine concentration.
The variation in the residual chlorine decay constants is
due to differences in organic matter in each sample.
NBs contributed to the purification process of STWW, as evidenced by
the reduced need for chlorine in disinfection.
Therefore, it is suggested that NB technology can be employed more
successfully for advanced wastewater treatment, especially when employing
chlorination as the disinfection method. Based on this paper, additional study is
required to determine the relationship between the chlorine decay of STWW and
the injection of NBs, especially when it comes to the timing of the injection, the
method used to create the NBs, their diameter, ZP, types, and other characteristics.
