COD对生物除磷颗粒污泥稳定性影响研究

颗粒污泥稳定性是影响其应用的主要因素之一.以SBR中成熟的生物除磷颗粒污泥为研究对象,探讨进水COD浓度对系统稳定性的影响.结果表明,当进水COD浓度由300 mg/L逐渐升高到500 mg/L时,磷去除率由93%降低到88%;当进水COD浓度在400 mg/L以下时,污泥的最大比释磷速率和比吸磷速率分别为45.2 m...

Influence of COD on phosphorus removal granular sludge stability

The stability was one of important factors for application of granular sludge. With the influent COD concentration changed the stability of the biological phosphorous removal granular sludge was studied in a sequencing batch reactor (SBR). When the influent COD concentration gradually increased from 300 mg/L to 500 mg/L, the phosphorus removal efficiency decreased from 93% to 88%. When the influent COD concentration was below 400 mg/L, the max. specific phosphorus release rate and the max. specific phosphorus uptake rate were 45.2 mg/(g MLSS·h) and 33.5 mg/(g MLSS·h), respectively, and the phosphorus content of MLSS was 5.6%~7%, and the effluent SS was below 50 mg/L. When the influent COD concentration was stepped up to 550mg/L, the phosphorus removal efficiency decreased to 63%, the effluent SS was above 150 mg/L, the filamentous bacteria overgrew, and the granular sludge was disintegrated. The biological phosphorous removal granular sludge could stand some impacts of COD concentration, and the system would break down at high COD concentrations.