Dr. USAMA F. MAHMOOD
Department of Civil Engineering
AL-AZHAR University, Cairo, Egypt
The results from pilot scale UASB-SBR system for municipal wastewater treatment carried
out for about eight months for testing the efficiency of this system in nitrogen, phosphorus
removal under different operation conditions. Retention time in UASB varied from 4 hr to 3
hr while aeration time cycle in SBR, varied from 2.5, 5&9 hrs respectively. Results indicated
that Ammonia Nitrogen and total kjeldahl removal depend on aeration time in (SBR).
Complete nitrification of ammonia took place when aeration time was more than 5 hours, and
removal of TKN about 55.6%, 61.8% and 80% for 1st , 2nd and 3rd runs respectively.
Removal percent of phosphorus was 65% and did not have significant change with increasing
aeration time till 9 hrs.