In Indonesia, the processing and management of hospital wastewater are very worrying, where only 36 % of
hospitals have a Wastewater Treatment Plant (WWTP) and 64 % of wastewater is discharged directly into
receiving water bodies or using infiltration wells [2]. Mostly, Hospital Wastewater Treatment Plant (HWWTP)
uses a combination of biological - chlorination processes with the discharge often exceeding the quality
standard, such as Pb, phenol, ammonia free, ortho phosphate, and chlorine free [34]. Low quality of discharges
on HWWTP especially toxic pollutants (Pb, phenol) can be caused by not-yet-optimal biological - chlorination