ABSTRACT
A considerable protozoa Vorticella spp bloom attached to granules and the rest of the accumulated particles were observed; potentially contributing to the removal of the additional suspended solids which were part of the faecal sludge (FS) recipe. The provision of faecal sludge (FS) treatment is a necessary practice in urban areas not completely sewered where on-site sanitation is facilitated. The sludge generated on such facilities is highly concentrated in suspended solids, organic matter, and other contaminants; therefore, it needs a suitable treatment option to avoid the contamination of water resources and the risks to public health. The preliminary information showed that aerobic granular sludge (AGS) systems were not severely affected when co-treating septic sludge and FS; the desirable or maximum amount of FS concerning the influent wastewater that can be appropriately treated by the AGS system is yet unknown.
