Process Control of Aerated Static Composting of Swine Manure

Waste from animal husbandry is an increasing prominent environmental quality issue. This paper summarizes experimental results on the effects of various bulking agents on the efficiency of composting swine manure. The manure was composted mixed with corn straw and/or sawdust. The results indicated that all composting masses could reach the settled thermophilic temperature 55℃ and meet requirement of national standard of manure harmless. Aerated rate was an important influence factor of compost efficiency. Because of the large free space and high oxygen concentration, it takes 3～4 days to reach the set temperature for the mixture compost masses of manure with corn straw. However, it takes 12～17 days to reach the set temperature for the mixture compost masses of manure with sawdust. The volumes of the compost mixture reduced 1/2～1/3 after composting.