Biological wastewater pretreatment with a rotating biological contactor was found to be an appropriate technology to be used in developing countries for the reuse of wastewater for irrigation. Criteria for the wastewater pretreatment prior to agricultural reuse were elaborated based on removal of put-rescible organic matter and on balancing the nutrient composition of the effluent. Experimental investigations performed in Cairo, Egypt, show that an organic surface loading of the RBC of 15 mg BOD5/l leads to optimum effluent quality in respect to irrigation reuse with high organic constituents and partial nitrogen removal. The biodegradation of municipal sewage and ammonia conversion in Cairo proceeds at higher rates compared to temperate conditions.

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