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首页> 外文期刊>Waste Management >Chemical, physical and microbial properties and microbial diversity in manufactured soils produced from co-composting green waste and biosolids
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Chemical, physical and microbial properties and microbial diversity in manufactured soils produced from co-composting green waste and biosolids

机译：由绿色废物和生物固体共同堆肥产生的人工土壤中的化学，物理和微生物特性以及微生物多样性

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The effects of adding biosolids to a green waste feedstock (100% green waste, 25% v/v biosolids or 50% biosolids) on the properties of composted products were investigated. Following initial composting, 20% soil or 20% fly ash/river sand mix was added to the composts as would be carried out commercially to produce manufactured soil. Temperatures during composting reached 50 °C, or above, for 23 days when biosolids were included as a composting feedstock but temperatures barely reached 40 °C when green waste alone was composted. Addition of biosolids to the feedstock increased total N, EC, extractable NH_4, NO_3 and P but lowered pH, macroporosity, water holding capacity, microbial biomass C and basal respiration in composts. Additions of soil or ash/sand to the composts greatly increased the available water holding capacity of the materials. Principal component analysis (PCA) of PCR-DGGE 16S rDNA amplicons separated bacterial communities according to addition of soil to the compost. For fungal ITS-RNA amplicons, PCA separated communities based on the addition of biosolids. Bacterial species richness and Shannon's diversity index were greatest for composts where soil had been added but for fungal communities these parameters were greatest in the treatments where 50% biosolids had been included. These results were interpreted in relation to soil having an inoculation effect and biosolids having an acidifying effect thereby favouring a fungal community.
机译：研究了向绿色废物原料（100％绿色废物，25％v / v生物固体或50％生物固体）中添加生物固体对堆肥产品性能的影响。初始堆肥后，将20％的土壤或20％的粉煤灰/河砂混合物添加到堆肥中，这将在商业上进行以生产人造土壤。当将生物固体作为堆肥原料时，堆肥过程中的温度达到50°C或更高，持续23天，而仅对绿色废物进行堆肥时，温度几乎达到40°C。原料中添加生物固体增加了总N，EC，可提取的NH_4，NO_3和P，但降低了pH，大孔率，持水量，微生物量C和堆肥中的基础呼吸。向堆肥中添加土壤或灰烬/沙子极大地提高了物料的可用持水量。 PCR-DGGE 16S rDNA扩增子的主成分分析（PCA）根据向堆肥中添加土壤来分离细菌群落。对于真菌ITS-RNA扩增子，PCA基于添加的生物固体来分离群落。对于添加了土壤的堆肥而言，细菌种类的丰富度和香农的多样性指数最大，而对于真菌群落而言，这些参数在包括50％生物固体的处理中最大。这些结果被解释为与具有接种作用的土壤和具有酸化作用的生物固体有关，从而有利于真菌群落。

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