الفهرس 
chapter 1Only 14 pages are availabe for public view
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Abstract
A pilot-scale facultative lagoon was constructed in the summer of 2005, the model was positioned in an open .,... the faculty of engineering at Suez Canal university in Port Said city. In order to improve the facultative lagoon systems perform as stage. The chosen surface loading rate were 200, 300,
400kgBOD/ha/d and the de¢!of water chosen with every surface loading rate
were 40, SO,60 and 80ero. It was concluded that the optimum surface loading rate was 300kgBOD/ha/d, and the best -depth was 60an.. where, the
removal efficiency of BOD, and S.S were 62.S% and 55%