الفهرس | Only 14 pages are availabe for public view |
Abstract ABSTRACT Sludge treatme~t and disposal is major consideration in the planning and design of new wastewater treatment plants and in the expansion and upgrading of existing facilities. In Egypt, all the wastewater treatment plants are using the natural sludge dewatering system, sand drying beds method. But during the design phase of wastewater treatment plant for Alexandria City, a problem of land availability was faced. So, the study was done by using vacuum assisted-drying beds method for sludge dewatering instead of ordin-a.ry sand drying beds. The different options for sludge dewatering were discussed then the vacuum assisted-drying beds method was chosen for the facing for the problem of land. This study discusses the sludge dewatering using. the vacuum assisteddrying beds method with or without the use of polymers additions and comparing it with the ordinary sand drying beds technically and economically. ’ Due the tests done, it can be seen that the success of the vacuum assisted-drying beds method for sludge dewatering is high with the use of polyelectrolyte polymer but in the other hand the designer must try the ordinary sand drying beds firstly before using this method for economy & its facilities in maintenance, labours requirements and construction. |