| Biochemical fulvic acid contains large numbers of beneficial microbial and active functional groups, which is always applied to the agricultural production. However, it is barely reported that this material is used in solid waste treatment. In order to explore the effect of different dosage of biochemical fulvic acid on cassava waste composting, cassava waste, dried chicken manure and tobacco stems powder were used as raw material to conduct the simulated composting experiment. Four treatments were Tl (compost materials+%ol biochemical fulvic acid), T2 (compost materials+%o2 biochemical fulvic acid), T3 (compost materials+%o3 biochemical fulvic acid), and CK (compost materials only). We measured the effects of these treatments on temperature, water content, the degradation rate of starch, DOC, cellulose, hemicellulose and lignin and some maturity indexes (ammonium nitrogen, nitrate nitrogen, C/N and humic acid/fulvic acid) and toxic substances(cyanide and Cu,Pb, Zn, Cr, Cd, As). The results show adding biochemical fulvic acid can promote the temperature increasing rapidly, reduce the water content effectively, and increase the degradation rate of starch, DOC, cellulose and hemicellulose for 5.95%,5.29%,7.35%,4.95%, respectively. The variation of maturity indexes also suggests adding biochemical fulvic acid can promote the compost maturity and narrow the composting period. The compost maturity of four treatments is summarized as T2>T1>T3>CK, which indicates the effect of adding ‰2 biochemical fulvic acid to compost materials is the best. On the other hand, the results show adding biochemical fulvic acid can reduce the cyanide content effectively, and lower the content and distribution rate of forms of heavy metals, which results in the decrease of ecological risk of cyanide and heavy metals in compost product. After the comprehensive comparison and analysis, this paper suggests the effect of adding ‰2 biochemical fulvic acid to compost materials is the best. |
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