Evaluation of Large, Modern Warehouse Storages Designed and Constructed for Application of Carbon Dioxide

摘要

The updated warehouses of controlled CO2 storage with total capacity of 45 000 t were constructed at Mianyang,in which field experiments were successfully carried out. This paper introdues the construction techniques, CO2 supply and distribute system, auto-monitor system, security and guarantee facilities, sealing materials, airtight techniques and field experiments by the techniques of CA grain storage couplied with natural low temperature grain storage. The results showed that design and construction techniques were reasonable. The pressure decay halflife reached 12 min from 500 pa declined to 250 Pa, and thus effectively ensured the concentration of CO2. Auto supply and distribution for CO2 as well as monitoring were realized during the whole process. The field experiment proved that both susceptible strains and resistant strains of Sitophilus zeamais, Rhizopertha dominica and Tribolium castanuem were 100% controlled with exposure for more than 14 d to CO2 which concentration ranged from 35%-75%. After incubating the mixed samples at different culture-conditions for 42 d,no alive adults appeared. There were also no significant changes in the quantity of carried microorganism in the grain stored with CO2. Compared with conventional storage, after 40 months storage with CA grain storage couplied with natural low temperature grain storage for the new-harvest grain with safe moisture content and good quality, the grain quality was better and could be steady after unsealing.