Nogales R, Elvira C, Benítez E, Thompson R, Gomez M
Dpto. Agroecologia y Proteccion Vegetal, CSIC, Granada, Spain.
J Environ Sci Health B. 1999 Jan;34(1):151-69. doi: 10.1080/03601239909373189.
A laboratory study was conducted to examine the feasibility of vermicomposting dairy biosolids (dairy sludge), either alone or with either of the bulking agents-cereal straw or wood shavings, using the epigeic earthworm-Eisinea andrei. Earthworms added directly to these three substrates died within 48 hours. A system was developed to overcome the toxic effect of unprocessed dairy biosolids. The substrates were placed over a layer of vermicomposted sheep manure into which the earthworms were inoculated. Within two weeks, all earthworms were within the upper layer of substrate. Compared to sheep manure which is a favourable substrate for vermicomposting, the three substrates containing dairy biosolids were more effective in supporting earthworm growth and reproduction. The final products obtained after 63 days of vermicomposting had 39-53% less organic carbon than the initial substrates. Organic fractionation indicated that vermicomposting increased the stability of the materials to biological decomposition. The vermicomposts obtained from the three substrates with dairy biosolids had low heavy metal contents and electrical conductivities, and did not inhibit plant growth when compared with a commercial vermicompost in a bioassay.
进行了一项实验室研究，以检验使用表栖蚯蚓安德爱胜蚓单独或与两种膨松剂（谷物秸秆或刨花）之一一起对奶牛生物固体废弃物（奶牛污泥）进行蚯蚓堆肥处理的可行性。直接添加到这三种基质中的蚯蚓在48小时内死亡。开发了一种系统来克服未处理的奶牛生物固体废弃物的毒性作用。将基质放置在一层已进行蚯蚓堆肥处理的羊粪上，并在羊粪中接种蚯蚓。两周内，所有蚯蚓都位于基质的上层。与作为蚯蚓堆肥有利基质的羊粪相比，含有奶牛生物固体废弃物的这三种基质在支持蚯蚓生长和繁殖方面更有效。蚯蚓堆肥63天后获得的最终产物的有机碳含量比初始基质低39%至53%。有机成分分析表明，蚯蚓堆肥提高了材料对生物分解的稳定性。从含有奶牛生物固体废弃物的三种基质中获得的蚯蚓堆肥重金属含量和电导率较低，在生物测定中与商业蚯蚓堆肥相比，对植物生长没有抑制作用。
