Performance of sequencing batch biofilm reactor on pollutants removal and phosphorus enrichment in wastewater
The sequencing batch biofilm reactor is capable of removing pollutants and simultaneously enriching phosphorus in wastewater.Existing literature focuses on laboratory studies conducted with artificially formulated low phosphorus wastewater when organic matter and nitrogen have been effectively removed from raw sewage.Based on this,the feasibility of the process for simultaneous pollutant removal and phosphorus enrichment was investigated using actual municipal wastewater after primary sedimentation.The results showed that the process could effectively remove multiple pollutants in the influent water under suitable environmental and operating conditions,and at the same time,it had the performance on phosphorus enrichment;when the water temperature was greater than 22.5 ℃,the aerobic/anaerobic HRT was 5h/3h,and the DO was 6.5 mg·L-1,the removal rates of organic substance,ammonia nitrogen,total nitrogen and phosphorus were higher than 83.8％,93.8％,93.4％,and 97.0％,respectively,and the concentration of PO43-P in enriched solution was 42.1 mg·L-1.Temperature and DO were the main factors affecting the process performance.Under the experimental conditions,the temperature had a significant effect on the removal of ammonia and nitrogen,while it had less effect on the removal of organic substance and phosphorus,and phosphorus enrichment;higher DO favored the removal of organic substance,ammonia and phosphorus.The process exhibited stable simultaneous nitrification-denitrification in aerobic stage and was not affected by high DO,and total nitrogen removal was mainly governed by ammonia nitrogen removal.
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