1- Regional problems in waste works in the Middle East area .
2- Water Balance .
3- The Ecological Alternative for sewage treatment By Moving Bids Bio Reactor (MBBR) .
4- Sludge dryer by Air or Solar Energy .
5- Bio Gas Generation from Soild Waste .
6- Waste Water Treatment by MBR ( Membrane Bio Reactor) .
7- Water Hummer .
8- Filtration .
9- Fine Screens .