(Source: Author)
Wet air oxidation
This method was initially designed for the paper industry, but it has
since been modified for use in sewage treatment facilities, particularly
for the treatment of high-toxicity industrial liquid effluent (Li et
al., 2020). It is advised, however, when the effluent is too diluted to
be burnt and too hazardous to be treated biologically. It is used to
oxidize organic material, converting carbon and nitrogen to carbon
dioxide and water in most cases (Suarez-Ojeda et al., 2007). The
oxidation procedure reduces the amount of sludge while increasing its
dewaterability for thermal treatment. The pros and cons are shown in the
table below (Table 10).
Table 10 . Principal advantages and disadvantages of wet air
oxidation transformation procedure in sludge transformation