A2O工艺好氧末段溶解氧变化对脱氮除磷影响
Effects of dissolved oxygen concentration at the end of aerobic stage in A2O on nitrogen and phosphorus removal
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摘要: 采用连续流A2O工艺处理实际的生活污水，研究好氧末段在不同溶解氧（DO）浓度条件下对污泥沉降性能、系统脱氮除磷的影响，同时考察了DO对污泥硝化活性、厌氧释磷速率和反硝化脱氮速率的影响。结果表明，随着末段溶解氧的提高，污泥容积指数SVI从140降至100左右，后又升高到120～170；系统的硝化效果提高，氨氮的去除率从60%升高到80%以上再到90%以上；总氮的去除效果也有显著提高，平均去除率从54%升高到63%再到67%；虽然磷的去除效果有所加强，总磷的平均去除率从41%升高到59%再到69%，但仍难达标。Abstract: A bench scale A2O process was used in this research to treat real domestic wastewater.The effects of dissolved oxygen at the end of aerobic stage on the settling property of the sludge， nitrogen and phosphorus removal of the system， anaerobic phosphorus release and denitrification performance were investigated. The results indicated that with the increase of dissolved oxygen concentraiton at the end of aerobic stage， SVI decreased from 140 to around 100， then increased to 120～170. Nitrification performance was improved， the removal efficiency of ammonia increased from 60% to 80% and finally achieved 90%. The average removal efficiency of total nitrogen increased from 54% to 63%，then achieved 67%. The average removal efficiency of total phosphorus increased from 41% to 59%， then to 69%， however it still could not meet the standard.
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