| Safe biological static harmless processing technology is a biological static composting process that is used to promote the rapid rot, decomposition and c yclic utilization of dead bodies of animals. Rice chaff, straw, sawdust and ani mal waste are used as compost raw materials to mix with inoculants, cover the dead bodies of animals under the ground thoroughly, adjust the physicochemic al property of raw material and promote the rapid growth and catabolism of th ermophilic microorganism. So as to improve the temperature of compost, kill most pathogenic bacteria and virus, degrade animal tissue, and make the dead bodies of animals into harmless and humified resource, and then thrown them i nto farmland as organic fertilizers. In the study of static harmless processing of non-infected dead pigs, carbon sources such as rice chaff, straw, sawdust and animal waste are mixed with dead pigs and its outputs to produce compost.Regarding to the method of compost construction, monolayer or multilayer construction is used based on the volume of the dead body. The major raw material of compost is animal waste, and 50% carbon sources, such as rice ch aff, straw and sawdust is added. During the process of compost fermentation, t he temperature of compost system, the moisture content of compost, its PH val ue and carbon nitrogen ratio are inspected. In the test of compost, the quantity of escherichia coli and coli group, the quantity of staphylococcus aureus, and the quantity of primary microorganism in compost are inspected during each sa mpling process. In a 50 days of static fermentation, the temperature exceeds 50℃ for 14 days, and the highest temperature at the depth of 70 cm inside the pile size reaches to 71.4℃, and the temperature has remained over 55℃ for 7days.The primary water content of compost is 60%, and it still remains at 60%-71% when the compost is almost done. The initial PH value of compost is 8.6, and it reaches to 8.9 the second day. Then, the PH value declines gradually until the 10 th day, the PH value remains at 8.5-8.9. The total C initial value of compost is 48.4, and it becomes 44.7 at the 55 th day, which keeps declini ng. The initial value of total N is 1.3, and it increases to 1.4 in uptrend. Thus,carbon nitrogen ratio declines from 37.1 to 31.5. The coli group in compost s tart its inactivation rapidly since the composting began, while staphylococcus a ureus also begin its inactivation gradually. In the test of compost, one can find that the survival amount of anaerobic fungi is very high, but it fluctuates and decreases as the carry forward of composting. The quantity of anaerobic fungi decreases as the rise of temperature of compost, but its quantity changes arou nd llog10 CFU/g wetwt as the time goes by. The initial quantity of heterotrop hic actinomycetes fluctuates within two orders of magnitudes. After the complet ion of composting, the temperature increases to 55℃ for three days, and remai ns at 45℃ for more than seven days, so basically all harmful microorganisms are inactivated..The above study indicates that after the construction of composting, static treatment and re-composting after a period are need until the compost fermenta tion is completed in order to achieve the effect of compost maturity. The stud y results show that this technology is safe, environmental and economic, which could help people to use cheap compost materials in rural areas, such as rice chaff, straw, sawdust and animal waste to degrade dead pigs, so dead bodies and its outputs can be dissolved thoroughly and transformed into beneficial org anic vegetable fertilizers and it becomes a practical and feasible method for ha rmless treatment of dead pigs in the region. In this study, it is expected to co nstruct large-scale, safe and high efficient technology to deal with dead animal bodies with biological and static composting, and provide a new method to tr eat animal bodies harmlessly and provide experiment and theoretical basis for t he establishment of relevant industry standards. |
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