The sequencing batch reactor (SBR) method was used throughout this research, for the treatment of hospital waste water in mosul. This system has also the advantages of low initial and performance costs. Different time periods were used in this study ranging (6-24) hrs for 6 months . The tests has been conducted in the environmental laboratory of the civil engineering department at the university of Mosul. Efficiency of PO4 removal from waste water depends on the change of anoxic conditions to aerobic. The efficiency is maximum when the periods of the two types of conditions are equal.. NO3 removal depend on food supply for micro- organisms to convert nitrates to nitrogen gas under anoxic conditions so it is change able.
According to the results gained, this kind of treatment could be used to remove phosphates & nitrates from hospitals wastewaters, and could be used for other cases when the discharge is relatively low, or unstable percentages of removal were 67% & 99% for SO4 & NH3 relatively.
Key Words :
phosphates , nitrates , sequencing batch reactor , biological treatment , hospital ww