Integrated treatment process for APMP pulping wastewater

Provided is an integrated treatment process for APMP pulping wastewater. The wastewater treatment process comprises the following steps that the APMP pulping wastewater is pumped into a cooling towerfor two-stage air cooling; after cooling, the APMP pulping wastewater enters a primary setting tank so that SS in the wastewater can be removed; after sedimentation treatment, the wastewater enters ahydrolysis acidification pool for pre-acidification; a two-stage internal-circulation anaerobic reactor is adopted to conduct anaerobic treatment on pre-acidification effluent; a surface aeration andactivated slurry method is adopted to conduct aerobic treatment on anaerobic effluent; after aerobic treatment, aluminum ferric chlorine sulfate is adopted to coagulate the wastewater; Fenton is adopted to conduct oxidation operation on the coagulated wastewater. The COD of the wastewater treated through the process is smaller than 40 mg/L, and compared with a traditional treatment process, effluent COD emission reduction i