Effects of Weathered Coal Additives on the Odor and Microbial Community Diversity During Cow Manure Aerobic Composting

doi:10.13560/j.cnki.biotech.bull.1985.2021-0032

Abstract

Abstract:

This study aims to understand the effects of different added amounts of weathered coal on the release of odor and the diversity of microbial communities during the composting process of cow manure. Taking fresh cow manure as the main material and adding 5%,10% and 15% weathered acid coal respectively to carry out a 50-day composting test,the effect of the weathered acid coal addition on the compost microbial community was analyzed by Biolog ECO flat panel detection technology. When the amount of added weathered coal was 5%-10%,the high temperature duration of composting treatment was 23-25 d,which was 3-5 d longer than that of CK treatment（20 d）;the average AWCD value,average Shannon index and average Simpson of the weathered coal treatment were 22.27%-28.47%,2.32%-6.06% and 23.21%-30.48% higher than the CK treatment,respectively; the seed germination index of compost product was 6.53%-13.06% higher than the CK treatment; NH₃ and H₂S release were 20.82%-39.74% and 25.17%-45.21% lower than the CK treatment respectively. In summary,adding 5%-10% weathered coal may increase the microbial diversity in the composting process,promote the succession of microbial populations,accelerate the transformation and metabolism of different substances,promote the decomposing process of the compost,and reduce the release of odor.

Key words: cow manure, compost, weathered coal, odor, microbial community

ZHAO Xu, WANG Wen-li, LI Juan. Effects of Weathered Coal Additives on the Odor and Microbial Community Diversity During Cow Manure Aerobic Composting[J]. Biotechnology Bulletin, 2021, 37(12): 104-112.

Figures/Tables 11

Table 1 Main ingredients of the material composting

材料Material	有机碳Organic carbon/%	全氮Total nitrogen/%	C/N	水分Moisture content/%
牛粪Cow manure	33.42	1.54	21.7	58.42
腐殖酸煤Humic acid coal	39.6	0.14	282.86	19.12

Fig.1 Dynamic variations in temperature under different compost treatments

Fig.2 Dynamic variations in pH value under different compost treatments

Fig.3 Dynamic variations in moisture content under different compost treatments

Fig.4 Dynamic variations in germination index（GI）of seeds under different compost treatments

Fig.5 Dynamic variations in C/N under different compost treatments

Fig.6 Dynamic variations in hydrogen sulfide concentra-tion under different compost treatments

Fig.7 Dynamic variations in ammonia concentration under different compost treatments

Fig.8 Dynamic variations in AWCD under different compost treatments

Fig.9 Dynamic variations in Simpson index under different compost treatments

Fig.10 Dynamic variationsin Shannon index under different compost treatments

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