China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (12): 4945-4952.doi: 10.16431/j.cnki.1671-7236.2022.12.042

• Environmental Safety • Previous Articles     Next Articles

Aerobic Composting Treatment of Pig Manure with Corn Straw and Its Safety Evaluation

LIU Xin1, CHEN Qun1, QIU Yulang1, HOU Guoxi1, LI Lin1, YAN Xiaogang1, LIU Dongmei2, LYU Zhichao3, GAO Xingai1, LI Zhonghe1, ZHANG Yunying1, YAN Qiuliang1   

  1. 1. Jilin Academy of Agricultural Sciences, Changchun 130033, China;
    2. Jilin Tianyan Modern Agricultural Development Co., Ltd., Liaoyuan 136200, China;
    3. Jilin Economic Management Cadre College, Changchun 130012, China
  • Received:2022-06-05 Online:2022-12-05 Published:2022-12-01

PDF (PC)

43

Abstract: 【Objective】 To explore the influence of aerobic composting with different proportions of pig manure and corn straw on the composting quality, and to evaluate the safety of composting products to provide reference for the resource utilization of pig manure and straw.【Method】 Using pig manure and corn straw as materials, three groups were set in the experiment, which were composted according to the volume ratio of pig manure and corn straw of 4:6 (group A), 6:4 (group B) and 8:2 (group C).The composting period lasts for 55 days.The temperature of the fermentation reactor and the ambient temperature were recorded daily, the reactor samples were collected on days 0, 5, 15, 25, 35, 45 and 55, and the water content, pH and seed germination index of the samples were measured, as well as the total nutrient content(total phosphorus, total potassium, total nitrogen), organic matter content, heavy metal content (total arsenic, total mercury, total lead, total cadmium, total chromium), fecal coliform group number and Ascaris egg mortality on days 0 and 55.【Result】 In groups A, B and C, the composting temperature increased first and then decreased with the increase of composting time, and the difference between groups was not significant (P>0.05);The water content decreased continuously, and the difference between groups was not significant (P>0.05);pH fluctuated between 7.5 and 9.1, and the change trend was basically the same, with no significant difference between groups (P>0.05).At the end of composting, the total nutrient contents of the samples in groups A, B and C were 6.94%, 7.36% and 6.95%, respectively, and the organic matter contents were 48%, 45% and 39%, respectively, which met the standard requirements of NY/T 525-2021.The seed germination indexes of the three groups were more than 80% at the end of composting, indicating that the decompositions were complete, in which the groups A and B exceeded 100% after 35 days.At the end of composting, the content of heavy metals, the number of fecal coliforms and the mortality of Ascaris eggs in groups A, B and C were all lower than the limits of the organic fertilizer standard.The number of fecal coliforms in groups A and B were <3/g, and the mortality of Ascaris eggs was 100%.【Conclusion】 The ratio of pig manure to corn straw by volume was 4:6, which was more conducive to composting maturity, could shorten the composting cycle, and met the standard requirements of harmless manure and organic fertilizer.

Key words: pig manure; corn straw; aerobic composting

CLC Number: