Configuration and application of heavy metal compound passivation in compost of swine feces residue

The innocent treatment of heavy metal in swine feces is the key link to realize the resource utilization of swine waste. Using the solid-liquid separated swine feces residue from large-scale pig farm as the test object， and taking wine residue，bentonite，plant ash，fly ash，straw powder，lime，rice husk ash，calcium magnesium phosphate fertilizer，mushroom residue as raw materials，according to certain proportion，five formula were desinged，to make the heavy metal composite passivator added to the swine feces residue，and adopt the aerobic composting process. The results showed that 5 kinds of formula could passivate copper（ Cu），zinc（ Zn），arsenic （As），mercury（ Hg），lead（ Pb），cadmium（ Cd），chromium（ Cr） of heavy metals in swine feces residue， besides cadmium，others decreased by 7%-34%. Comparative analysis showed that， after processing of formula 3，formula 5，the indexs of nutrient content and As，Hg，Pb，Cd，Cr were up to the national organic fertilizer production standard（ NY 525-2012），they can be used as the base material to produce green organic fertilizer，to realize the treatment of swine feces residue and resource utilization. The results are beneficial to prevent and reduce the environmental pollution caused by the breeding of livestock and poultry，and promote the construction of beautiful and livable countryside.