The experimental work was carried out in the wastes treatment laboratory of the Agricultural Engineering Department, Mansoura University to assess the optimal aeration rate and mechanical stirring to produce compost. C/N ratio of the examined raw materials was calculated to find out the mixing ratios of the correct ingredients. The composting of digested buffalo dung and maize stover has been investigated in a forced-aeration composting system at three different aeration rates (0.0003, 0.0005 and 0.0007 m 3 /s) and two different levels of mechanical stirring (Once and twice a week) to specify the optimal aeration rate and mechanical stirring system and used them with fresh buffalo dung and maize stover at moisture content of 65% w.b. Two control (traditional system) experiments were performed, the first (control1) was digested buffalo dung and the second (control2) was fresh buffalo dung. Temperatures of ambient air, bioreactor vessel, control1 and control2 were measured and recorded. Chemical analysis for the raw materials and the final compost was also carried out. The obtained results indicated that, the buffalo dung (digested or fresh) can be mixed with shredded maize stover together at a ratio of 2 part of buffalo dung to 1 part of maize stover (by weight) to produce compost. It is recommended to use aeration rate of 0.0005 m 3 /s at once a week mechanical stirring to produce compost with good properties inside the bio-reactor. According to the biological analysis, the produced compost from the digested buffalo dung is better than that from the fresh buffalo dung.
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