Process and apparatus for treating wastewater from pulping papermaking

The invention discloses a process for treating paper-making sewage, which comprises the following steps: 1. sewage in a water collecting pond is lifted to a fiber recovering tank for fiber recovery; 2. the discharged water is guided in a hydrolysis acidification tank for hydrolysis acidification reaction; 3. the discharged water is pretreated; 4. the sewage after pretreatment is guided in an anaerobic tank to degrade organic pollutants by anaerobic microorganism; 5. the discharged water at the step 4 is guided in a destabilization tank for improving biodegradability of the sewage; 6. the discharged water is guided in an aerobic biological tank for treatment; 7. the discharged water is guided in a secondary sedimentation tank for mud-water separation; and 8. the discharged water is sterilized and disinfected to meet the discharge standard and discharge into a clean water tank, and pressurized by a water pump and sent to a reuse water pipe network. The process has simple process and lower cost, and the discharged water directly meets the new standards, and the treating capabilities of the anaerobic tank and the aerobic biological tank are greatly improved simultaneously; moreover, the process only uses a small quantity of medicaments, and generates relatively less sludge.