After full operation of secondary treatment at the East and West treatment plants, the future production of sludge from these plants and from Amriya and Agamy secondary treatment plants in addition to the rest 14 secondary treatment plants all around Alexandria is expected to exceed than 1200 m3/d by 2015 thus the capacity if the sludge disposal site should exceed. Therefore, the future sewage sludge management represents a critical environmental issue in Alexandria, this management includes sludge dewatering, handling, transportation cost to the disposal sites and the final product marketing.
As the capacity of Alexandria sludge disposal system will be limited by the increase in sludge production and the current management system, there is an immediate need to investigate ways to establish a future management system and to demonstrate successful operations at higher sludge producing rates.
Currently, Site 9N the sole disposal site in Alexandria include a composting plant established when the site was initially developed as a dedicated disposal area for sludge. Consequently, land spreading of the sludge on the dedicated disposal area has ceased and all of the current production of raw sludge is now being composted using the turned windrow technique.
The present study aims to evaluate the current efficiency of the sludge management system and adopt a future vision for the Alexandria sludge system and recommend modifications to protect public health and environment.