The best way to treat sewage is recycling. Especially in recent years, with the strengthening of environmental protection, many Bayer alumina production enterprises have optimized their production processes, and reused steam condensate, equipment cooling water, red mud sewage and product washing water generated during Bayer production. By adding and optimizing the corresponding process, the excess condensate water is sent to the heat exchange station for waste heat utilization, the cooled condensate water is sent to each circulating water station and new pool for utilization, and the excess condensate water in the evaporation workshop is sent to each circulating water station and new pool for utilization; In the circulating water station with high water quality requirements, the sewage is sent to the evaporation circulating water station for reuse; In addition to the rainwater discharged from the water mine during the processing of raw tea, the precipitation is also collected and sent to the evaporation circulating water station for utilization. After the water is circulated, the Bayer process's "zero discharge of sewage" is truly realized.