Analysis of Cadmium, Zinc and Copper in Biogas Fermentation System of Pig Excrement

With the fermentation of pig excrement in 24 days, in the fermented liquid, fermented solid and the mixture of both, a dynamical change of cadmium content, zinc content and copper content had not been observed. On the other hand, the cadmium content, zinc content and copper content of fermented liquid were greater than those of the fermented solid. Furthermore, cadmium content, zinc content and copper content of fermented solid changed with contents of water and suspended solids.