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Elucidating the optimum added dosage of Diatomite during co-composting of pig manure and sawdust: Carbon dynamics and microbial community
Science of the Total Environment ( IF 9.8 ) Pub Date : 2021-02-25 , DOI: 10.1016/j.scitotenv.2021.146058
Xiuna Ren , Quan Wang , Xing Chen , Yue Zhang , Yue Sun , Ronghua Li , Ji Li , Zengqiang Zhang

Six dosages of DM (0%, 2.5%, 5.0%, 10%, 15% and 20%) were added into initial mixtures for 42 days of aerobic composting to investigate the optimum added dosage of Diatomite (DM) during co-composting of pig manure and sawdust. The results showed that adding DM was beneficial for reducing CH4 emissions and greenhouse gas emission equivalent (GHGE) values by 15.63–24.25% and 14.33–69.08%, respectively. Meanwhile, the main contributor to the GHGE value was N2O (58.76–75.98%), followed by CH4 (17.22–29.16%) and NH3 (6.38–13.36%). Moreover, the maximum values in the degradation of total organic matter and the formation rate of humic acid were 20.46% and 82.19% in 10% DM added treatment (T3), respectively. Furthermore, the increase in spectral parameters, including the specific UV absorbance at 254 nm (SUVA254), the specific UV absorbance at 280 nm (SUVA280) and Fourier transform - infrared parameters were facilitated by DM amendment. Additionally, the higher values of the relative abundances of Proteobacteria (50.98%) and Bacteroidetes (12.73%), and related metabolisms such as carbohydrate metabolism and amino acid metabolism, as well as the lower value of methane metabolism reported in T3, supported the difference in CH4 and humification of the two treatments. In conclusion, DM was determined to be an eco-practical additive to improve the quality of end products and reduce potential risks, and the best treatment in this study was 10% added treatment based on dry weight.



中文翻译:

阐明在猪粪和木屑共同堆肥过程中硅藻土的最佳添加量:碳动力学和微生物群落

将六剂DM(0%,2.5%,5.0%,10%,15%和20%)添加到初始混合物中进行有氧堆肥42天,以研究硅藻土(CO)共同堆肥期间的最佳添加剂量。猪粪和木屑。结果表明,添加DM有利于将CH 4排放量和温室气体排放当量(GHGE)值分别降低15.63–24.25%和14.33–69.08%。同时,GHGE值的主要贡献者是N 2 O(58.76–75.98%),其次是CH 4(17.22–29.16%)和NH 3(6.38–13.36%)。另外,在10%DM添加处理(T3)中,总有机物的降解最大值和腐殖酸的形成率分别为20.46%和82.19%。此外,DM修正促进了光谱参数的增加,包括254 nm处的特定UV吸光度(SUVA 254),280 nm处的特定UV吸光度(SUVA 280)和傅里叶变换-红外参数。此外,T3中报告的变形杆菌和拟杆菌的相对丰度(50.98%)和相关代谢(如碳水化合物代谢和氨基酸代谢)的相对较高值以及较低的甲烷代谢值也支持该差异。在CH 4中和两种治疗的谦卑。总之,DM被确定为一种生态实用的添加剂,可以提高最终产品的质量并降低潜在风险,并且本研究中最好的处理方法是按干重添加10%的处理方法。

更新日期:2021-03-07
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