Decomposition Effects of Camellia oleifera Shell and Silkworm Excrement Composting with Different C/N Ratios
[Objective]The decomposition effects of Camellia oleifera shell-silkworm excrement composting with different C/N ratios were explored,so as to provide the basis for the harmless and resource utilization of C.oleifera shell and silkworm excrement.[Method]C.oleifera shell and silkworm excrement were used as raw materials to conduct the aerobic composting experiment,and the treatments of C.oleifera shell-silkworm excrement composting with different C/N ratios were set,including CK(50 kg C.oleifera shell,C/N=100),T1(50 kg C.oleifera shell,45 kg silkworm excrement,C/N=20),T2(50 kg C.oleifera shell,31 kg silkworm excrement,C/N=25),T3(50 kg C.oleifera shell,23 kg silkworm excrement,C/N=30)and T4(50 kg C.oleifera shell,18 kg silkworm excrement,C/N=35),to study the changes of physical,chemical and biological indexes during the composting process.[Result]Compared with CK,the pH of C.oleifera shell-silkworm excrement composting with different C/N ratios performed neutral or weakly alkaline,and the maximum temperature and high temperature duration were also higher,among which the high temperature duration of treatments with C/N=20 and C/N=25 were 17 and 13 days,respectively,meeting the requirements of the Technical Requirement for Non-hazardous Treatment of Animal Manure(NY/T 1168-2006).C/N,organic matter,lignin and cellulose contents of C.oleifera shell-silkworm excrement composting with different C/N treatments gradually decreased with the prolongation of fermentation process,while the contents of total nitrogen,total phosphorus and total potassium increased.At the end of composting,the total nutrient contents of C/N=20 and C/N=25 treatments were higher,which were 5.10%and 4.28%,respectively,meeting the requirements of Organic Fertilizer(NY/T 525-2021).And organic matter,cellulose and lignin decreased by 17.1 percentages points,11.2 percentages points,8.4 percentages points and 15.8 percentages points,6.8 percentages points and 6.3 percentages points,respectively.GI was stable above 70%and had little toxicity to plants.The contents of heavy metals(Pb,Cd,Cr,As and Hg)in each treatment were higher than those before composting,but they were all lower than the standard limited value.[Conclusion]Adding appropriate proportion of silkworm excrement can effectively accelerate the decomposition of C.oleifera shell,and adjusting the initial C/N between 20 and 25 is conducive to decomposition of C.oleiferashell-silkworm excrement composting.
NETL
NSTL
万方数据
