College of Chemical Engineering, Northeast Electric Power University, NO.169 Changchun Road, Chuanying District, Jilin City, 132012, Jilin Province, China.
School of Electrical Engineering, Northeast Electric Power University, Jilin, 132012, China.
Environ Sci Pollut Res Int. 2021 Jun;28(21):27095-27108. doi: 10.1007/s11356-021-12572-y. Epub 2021 Jan 27.
Bean curd dreg (BCD) is a by-product of bean products, which can be used as a great ingredient for composting, but it combined with cow manure and corn stalk composting was rarely reported. In this study, the effect of BCD on the maturity and the micro-ecological environment was investigated under a lab-scale composting experiment and found that BCD was conducive to improve the maturity of compost during the BCD application. The excitation-emission matrix (EEM) showed that the final humus content in BCD treatments was richer than that in CK treatment. High-throughput sequencing results showed that BCD-applied better ameliorated the bacteria community structure with higher Actinomycetes abundance and lower denitrifying bacteria abundance in the late stage of composting. PICRUSt results showed that BCD-added decreased the abundance of microbial metabolic genes in the high temperature period (> 70 °C), but the metabolic abundance increased rapidly as the temperature cooled down. Compared with CK, the metabolic abundance decreased significantly on day 24, which was consistent with the conclusion of composting maturity. Redundancy analysis (RDA) results indicated that there were significant discrepancies in the microbial community structure of samples at different composting periods and the change of the dominant population in the BCD-treated compost samples were more outstanding than that in the CK treatment. Hence, BCD is a very good composting modifier that compensates for the disadvantages of composting and enhances the fertility of the compost product.
豆渣（BCD）是豆制品的副产品，可作为堆肥的重要原料，但将其与牛粪和玉米秸秆堆肥结合的研究很少见。本研究通过实验室规模的堆肥实验，考察了 BCD 对堆肥成熟度和微生态环境的影响，发现 BCD 的应用有利于提高堆肥的成熟度。激发发射矩阵（EEM）表明，BCD 处理的最终腐殖质含量比 CK 处理更丰富。高通量测序结果表明，BCD 处理在堆肥后期更好地改善了细菌群落结构，放线菌丰度较高，反硝化细菌丰度较低。PICRUSt 结果表明，BCD 添加降低了高温期（>70°C）微生物代谢基因的丰度，但随着温度降低，代谢丰度迅速增加。与 CK 相比，BCD 处理的代谢丰度在第 24 天显著降低，这与堆肥成熟度的结论一致。冗余分析（RDA）结果表明，不同堆肥期样品的微生物群落结构存在显著差异，BCD 处理堆肥样品中优势种群的变化比 CK 处理更明显。因此，BCD 是一种非常好的堆肥改良剂，可以弥补堆肥的不足，提高堆肥产品的肥力。
