Abstract：
To achieve efficient resource utilization of fly ash and multi-source organic waste, a composting experiment was carried out to investigate the effects of fly ash on co-aerobic composting using kitchens, chicken manure, and sawdust (15:5:2). The effects of different application doses (5 % and 10 %, calculated in total wet weight of organic solid waste) of fly ash on physical and chemical properties, nutrient elements, and bacterial community structure during co-composting were evaluated. The results showed that the addition dose of 5 % and 10 % fly ash significantly increased the highest temperature (56.6 ℃ and 56.9 ℃) and extended the thermophilic period to nine days. Compared with that in the control, the total nutrient content of compost products in the treatments of 5 % FA and 10 % FA was increased by 4.09 % and 13.55 %, respectively. The bacterial community structure changed greatly throughout the composting, and the bacterial diversity of all treatments increased obviously. In the initial stage of composting, Proteobacteria was the dominant phylum of bacteria, with a relative abundance ranging from 35.26 % to 39.40 %. In the thermophilic period, Firmicutes dominated; its relative abundance peaked at 52.46 % in the 5 % FA treatment and 67.72 % in the 10 % FA treatment. Bacillus and Thermobifida were the predominant groups in the thermophilic period of composting. The relative abundance of Bacillus and Thermobifida in the 5 % FA and 10 % FA treatments were 33.41 % and 62.89 %(Bacillus) and 33.06 % and 12.23 %(Thermobifida), respectively. The results of the redundancy analysis (RDA) revealed that different physicochemical indicators had varying degrees of influence on bacteria, with organic matter, pH, available phosphorus, and available potassium being the main environmental factors influencing bacterial community structure. In summary, the addition of fly ash promoted the harmlessness and maturation of co- aerobic composting of urban multi-source organic waste, while optimizing microbial community structure and improving the quality and efficiency of composting.
摘要：
为实现粉煤灰和多源有机废弃物的高效资源化利用,进行了堆肥实验，以研究粉煤灰对厨房联合好氧堆肥的影响，鸡粪,和锯末（15:5:2）。不同应用剂量(5%和10%，以有机固体废物的总湿重计算)粉煤灰的物理和化学性质，营养元素,并对共堆肥过程中的细菌群落结构进行了评价。结果表明，5%和10%粉煤灰的添加剂量显著提高了最高温度(56.6℃和56.9℃)，并将嗜热期延长至9天。与控制相比，5％FA和10％FA处理的堆肥产品的总营养成分分别增加了4.09％和13.55％，分别。堆肥过程中细菌群落结构发生了很大变化,所有处理的细菌多样性明显增加。在堆肥的初始阶段，变形杆菌是细菌的优势门，相对丰度在35.26%至39.40%之间。在高温时期，Firmicutes占主导地位；其相对丰度在5％FA处理中为52.46％，在10％FA处理中为67.72％。芽孢杆菌和热裂杆菌是堆肥嗜热期的主要群体。5％FA和10％FA处理中芽孢杆菌和热裂杆菌的相对丰度分别为33.41％和62.89％（芽孢杆菌）和33.06％和12.23％（热裂），分别。冗余分析(RDA)结果表明,不同理化指标对细菌,有机物质，pH值,有效磷,有效钾是影响细菌群落结构的主要环境因子。总之,粉煤灰的添加促进了城市多源有机废弃物混合好氧堆肥的无害化和成熟,同时优化微生物群落结构,提高堆肥的质量和效率。
