摘要：This study adopted a combined system comprising an up-flow anaerobic sludge blanket (UASB), Anoxic/Oxic (A/O) reactor, and anaerobic ammonium oxidation (anammox) reactor (ANAOR) for the advanced treatment of actual landfill leachate through partial nitrification and anammox. The system influent was a liquid consisting of raw leachate and domestic wastewater mixed at a ratio of 1:5, with ρ(CODcr), ρ(NH4+-N), and ρ(TN) values of 500–600, 380–400, and 390–410 mg/L, respectively. After treatment, the same three indicators for the final effluent were 63–70, 29.04, and 10.30 mg/L, respectively. This study investigated synchronous methanogenic denitrification and removal of carbon and nitrogen in the UASB, followed by denitrification in the A/O–ANAOR through the coupling of partial nitrification and anammox. The test results indicate that when the amount of dissolved oxygen in the A/O reactor was controlled at 0.30–0.50 mg/L, partial nitrification occurred, with the accumulation rate of nitrite nitrogen being stable at 86.09%. The residual ammonia nitrogen and nitrite nitrogen produced by partial nitrification were subsequently removed through anammox in the A/O and ANAOR, leading to the advanced removal of TN through the combined system. The system therefore addresses two current issues in the treatment of landfill leachate: difficulty complying with requisite standards for TN in effluent after biological treatment and the high costs of external carbon sources.
