The invention provides a liquid
fertilizer conversion treatment method and
system for pig
manure. The method comprises steps that:
solid-liquid separation is performed on pig
manure to obtain pig
manure liquid and pig manure residues; the pig manure liquid passes through a screen 1 to screen out particles which have great harm to a
reverse osmosis membrane; the screened liquid is subjected to VSEPtreatment,
clear liquid obtained after VSEP treatment is treated through a
reverse osmosis membrane 1,
clear liquid obtained
after treatment with the
reverse osmosis membrane 1 is treated through a reverse
osmosis membrane 2 to obtain clear water, concentrated water obtained
after treatment with the reverse
osmosis membrane 1 is returned to the VSEP treatment, and concentrated water obtained
after treatment with the reverse
osmosis membrane 2 is returned to the reverse osmosis membrane 1 treatment; the pig manure residues obtained after
solid-liquid separation are subjected to
superfine grinding and then evenly mixed with the concentrated water obtained after VSEP treatment according to a preset proportion, and the mixture is fermented to obtain a liquid
fertilizer matrix; and the liquidfertilizer matrix is screened through a screen 2 with a corresponding aperture according to the standard for preparing a liquid
fertilizer, and the screened liquid is mixed with the added corresponding
nutrient solutions according to the requirement for producing the corresponding liquid fertilizer to obtain the corresponding specific liquid fertilizer. The method is simple, efficient, free of
pollution, low in cost and high in additional value.