The invention belongs to the technical field of biological
nitrogen removal of landfill
leachate, and relates to a device and method for autotrophic advanced
nitrogen removal biological treatment of mature landfill
leachate, in particular to a device and method for step-feed biological treatment of mature landfill
leachate. The device is provided with a
raw water tank, an outlet water tank, an integrated autotrophic
nitrogen removal SBR reactor, a PCL
control system and online detection equipment. Three types of
bacteria, namely,
ammonia oxidation
bacteria,
anaerobic ammonium oxidation bacteria and
denitrification bacteria mainly exist in the integrated autotrophic
nitrogen removal SBR reactor. A heating device, a stirring device and an
aeration device are arranged in the integrated autotrophic
nitrogen removal SBR reactor. A water inlet unit, an
aeration unit, another water inlet unit and an anoxic stirring unit are included in one reaction period, and mature landfill leachate is rapidly pumped into the reactor through a water inlet pump at each
aeration and anoxic stirring stage. Partial
nitrification is carried out in each aeration stage, and anaerobic
ammonia oxidation and
denitrification are completed in each anoxic stirring stage. The process is simple, operation and management are convenient, and the purpose of advanced
nitrogen removal of mature landfill leachate is achieved without adding any external
carbon source.