الفهرس 
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Abstract
This study was made on the pilot plant which is built in El-Berka wastewater treatment plant located in El-salam city in east Cairo that was
established at June 2007 to try to improve the performance of the up flow anaerobic sludge blanket (USAB) reactor in treating local domestic
sewage using packing material.
The experiment work consists of three experiments; two batch experiments which is carried out in closed jars and the main experiment
which is carried out on the pilot plant which consists of three identical UASB reactors (R1, R2, R3) working in parallel.
The target of the first batch experiment is to investigate the activity of USAB using packing material. And, the target of the second
batch experiment is to investigate the biodegradability of USAB. While the target of the main experiment on the pilot plant is to improve the performance of the up flow anaerobic sludge blanket (USAB) reactor in treating local domestic sewage using packing material.
Adding packing material in (USAB) reactor was successful and showed high removal efficiencies at extremely high influent loads.
However the system showed more stability against hydraulic and organic influent load variations.