Over the past several years increasing of cellulites in some regions of the country has been reported. During August and September of 2005, 4.48% of total slaughtered broilers were condemned due to cellulitis in Masjid Soleiman slaughterhouse. Four out of 98 slaughtered flocks were infected to cellulitis. The condemnation rates in infected flocks were: flock 1: 1.55%, flock 2: 0.993%, flock 3: ...

This study combines a two-phase biological treatment system of activated sludge/contact aeration process by adding biological contact filters into the rear sector of the activated sludge aeration tank of the slaughterhouse wastewater treatment plant. This system keeps the advantages of complete mixing of substrates and microorganisms and flexible operation of the activated sludge process, and i...