Effect of Microbial Compound Agent Addition on Maturation Rate of Distiller's Grains Compost
To study the maturation of distiller's grains compost,Jiangxiang distiller's grains were used as the main raw material.Rice straw fermented for liquor production was added to improve aeration,and calcium-magnesium phosphorus fertilizer was added to increase the pH value.The high-temperature aerobic composting lasted 36 days.Temperature,pH,electrical conductivity,nitrogen content,and germination index during composting were determined to explore the effects of the microbial compound agent composed of Bacillus subtilis,Bacillus amyloliquefaciens,and Saccharomyces cerevisiae on the composting process and maturation rate.The results showed that the control group without an extra microbial agent and the treatment group added with the microbial compound agent experienced 30 days of high-temperature period and then entered the cooling period.Both groups reached the harmless standard of high-temperature compost.Compared with the control group,the addition of the microbial compound agent increased the rate of heap warming by 0.16℃/d from days 1 to 19,increased the pH growth rate by 0.04/d during days 1 to 9,decreased the electrical conductivity values by 0.15-0.30 mS/cm during days 18 to 24 and 30 to 36,and reduced the accumulation of NH4+-N by 20.81%—33.23%from days 12 to 36.The germination index increased to 70.85%on the 30th day after the inoculation of the microbial compound agent,meeting the maturation requirement of organic fertilizer,while the germination index of the control group only reached 47.21%.To sum up,the compound microbial agent can accelerate the degradation of organic matter,rapidly improve the acidic environment,reduce the concentration of salt and ammonium nitrogen,promote the rapid increase of seed germination index,accelerate the composting process of distiller's grains,and improve the composting speed.
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