| 英文摘要 |
The aim of the project is to reclaim and reuse piggery waste and digestate efficiently as the farm application. Firstly, suitable compost earthworm species should be selected, and the black soldier fly larva has to be cultivated. Secondly, by using piggery waste and digestate as the substrate, the suitable conditions to cultivate earthworm and black soldier fly larva respectively will be developed. After the determination of environmental benefits from the reclamation and reuse of piggery waste and digestate, a demonstration field will be established for the reclamation and reuse of piggery waste and digestate with earthworm and black soldier fly larva. Finally, promotion activities and events will be held to show the results abovementioned as well as to encourage and counsel livestock farmers for the business model with reclamation and reuse of the piggery waste and digestate. In this project, it is shown that piggery waste and digestate with proper operation and adjustment were able to be used as the substrate for African night crawler (ANC) and black soldier fly larva (BSFL). Shortly, these substrates could be transformed to worm casts, which are regarded as soil amendments and fertilizers. The piggery waste was the most suitable substrate since it along could be used as the substrate for ANC and BSFL to grow well within, On the contrary, to be used as the substrate for the ANC and BSFL, the digestate had to be mixed and homogenized with accessory materials. However, after the process of ANC and BSFL, the eight toxic metals (As, Pb, Hg, Cd, Cu, Zn, Ni, Cr) in all the substrates were not able to be reduced significantly. Despite this, the concentrations of the heavy metals in the substrates were mostly lower than the regulation ones after the process of ANC or BSFL. In addition, these processed substrates are able to be used as soil amendment and fertilizers because they were rich in minerals and nutrients which are necessary for plants. On the other hand, after processing those substrates abovementioned, the concentrations of all the heavy metals in ANC and BSFL were lower than the regulations for the animal food, soil amendment or fertilizer. Moreover, the body of these post-processing worms contained plenty of crude protein and fat, especially in BSFL, and thus can be considered as an additive in animal food.
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