Abstract: The harmless digestion of biogas slurry by water bamboo, lotus root and rice crops on wetland was studied. The results showed that 1 hm2 pond of lotus roots could purify 2 475 t biogas slurry in a whole growth period. The lotus roots harvested from the pond met the standards of NY5238-2005 pollution-free foods of aquatic vegetables. Under the irrigation amount of 495 t·hm-2, the digestion time of water bamboo, lotus root and rice was 7, 7 and 14 d, respectively, which was in accord with the standard of livestock emission standards for livestock farming industry for national GB18596-2001; meanwhile, the control treatment without any plants was 21 d.

Key words: biogas slurry, water bamboo, lotus root, rice, water quality