School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China.
College of Chemistry Biology and Environment, Yuxi Normal University, Yuxi, 653100, China.
Environ Sci Pollut Res Int. 2021 Jun;28(24):31539-31548. doi: 10.1007/s11356-021-12846-5. Epub 2021 Feb 19.
The present study aimed to explore the effect of a range of moisture content levels, including 65%, 72%, and 78%, on physicochemical properties and microfauna communities during vermicomposting of municipal sludge. As a result, death of perishable microfauna together with the degradation of organic matter was the dominant response in all groups in the early period of vermicomposting, while the effects of moisture content levels on various physiochemical parameters did not appear until the mid-later period. After the treatment with 78% moisture content, the content of mineral nitrogen was 1.186 g/kg in the sludge, with a 9.36 × 10 ind./g of microfauna quantity and 663.01 g of earthworm biomass. The values of these three measurements in 78% group were significantly higher than other two groups (p < 0.05), indicating that the effects of 78% moisture content were more pronounced for promoting nitrogen mineralization as well as microfauna and earthworms growth during vermicomposting. Specifically, testate amoebae were strongly associated with nitrification process, while nematodes were related to ammonification and phosphorus mineralization, of which testate amoebae had great potential of being bioindicators during vermicomposting of municipal sludge.
本研究旨在探讨不同水分含量水平（65%、72%和 78%）对城市污泥堆肥过程中理化性质和微型动物群落的影响。结果表明，在堆肥的早期，易腐微型动物的死亡和有机物的降解是所有组的主要反应，而水分含量水平对各种生理化学参数的影响直到中晚期才出现。经过 78%水分含量处理后，污泥中矿质氮含量为 1.186 g/kg，微型动物数量为 9.36×10 ind./g，蚯蚓生物量为 663.01 g。这三个测量值在 78%组中的值明显高于其他两组（p < 0.05），表明 78%水分含量对促进氮矿化以及微型动物和蚯蚓在堆肥过程中的生长具有更显著的影响。具体来说，有壳变形虫与硝化过程密切相关，而线虫与氨化和磷矿化有关，其中有壳变形虫在城市污泥堆肥过程中具有很大的生物指示潜力。
