To achieve high efficiency of nitrogen and phosphorus removal and to investigate the rule of simultaneous nitrification and denitrification phosphorus removal （SNDPR）, a whole course of SNDPR damage and recovery was...To achieve high efficiency of nitrogen and phosphorus removal and to investigate the rule of simultaneous nitrification and denitrification phosphorus removal （SNDPR）, a whole course of SNDPR damage and recovery was studied in a pilot-scale, anaerobicanoxic oxidation ditch （OD）, where the volumes of anaerobic zone, anoxic zone, and ditches zone of the OD system were 7, 21, and 280 L, respectively. The reactor was fed with municipal wastewater with a flow rate of 336 L/d. The concept of simultaneous nitrification and denitrification （SND） rate （rSND） was put forward to quantify SND. The results indicate that： （1） high nitrogen and phosphorus removal efficiencies were achieved during the stable SND phase, total nitrogen （TN） and total phosphate （TP） removal rates were 80% and 85%, respectively; （2） when the system was aerated excessively, the stability of SND was damaged, and rSND dropped from 80% to 20% or less; （3） the natural logarithm of the ratio of NOx to NH4^＋ in the effluent had a linear correlation to oxidation-reduction potential （ORP）; （4） when NO3^- was less than 6 mg/L, high phosphorus removal efficiency could be achieved; （5） denitrifying phosphorus removal （DNPR） could take place in the anaerobic-anoxic OD system. The major innovation was that the SND rate was devised and quantified.展开更多
同步硝化反硝化（simultaneous nitrification and denitrification，简称SND）是氧化沟工艺实现优良脱氮效果的主要原因，为了较好实现SND，采用ORP作为氧化沟工艺SND的控制参数．采用缺氧-厌氧-氧化沟模型对市政污水进行了生物脱氮研...同步硝化反硝化（simultaneous nitrification and denitrification，简称SND）是氧化沟工艺实现优良脱氮效果的主要原因，为了较好实现SND，采用ORP作为氧化沟工艺SND的控制参数．采用缺氧-厌氧-氧化沟模型对市政污水进行了生物脱氮研究．UORP在-30～30mV，NH4^＋和NO3^-的含量均比较低，发生了较好的SND；UORP在30mV以上，出水的总无机氮（TIN）中95％以上为NO3^-，该状况下硝化效果良好，UORP在-30mV以下，硝化不充分，出水的TIN中78％以上为NH4^＋；UORP在-30～30mV，TN的去除率在88％以上，SND作用去除的NO3^-占总的NO3^-去除的99％以上；氧化沟中的NH4^＋和NO3^-之比的对数与UORP有着很好的相关性，相关系数R=-0．97．展开更多
文摘To achieve high efficiency of nitrogen and phosphorus removal and to investigate the rule of simultaneous nitrification and denitrification phosphorus removal （SNDPR）, a whole course of SNDPR damage and recovery was studied in a pilot-scale, anaerobicanoxic oxidation ditch （OD）, where the volumes of anaerobic zone, anoxic zone, and ditches zone of the OD system were 7, 21, and 280 L, respectively. The reactor was fed with municipal wastewater with a flow rate of 336 L/d. The concept of simultaneous nitrification and denitrification （SND） rate （rSND） was put forward to quantify SND. The results indicate that： （1） high nitrogen and phosphorus removal efficiencies were achieved during the stable SND phase, total nitrogen （TN） and total phosphate （TP） removal rates were 80% and 85%, respectively; （2） when the system was aerated excessively, the stability of SND was damaged, and rSND dropped from 80% to 20% or less; （3） the natural logarithm of the ratio of NOx to NH4^＋ in the effluent had a linear correlation to oxidation-reduction potential （ORP）; （4） when NO3^- was less than 6 mg/L, high phosphorus removal efficiency could be achieved; （5） denitrifying phosphorus removal （DNPR） could take place in the anaerobic-anoxic OD system. The major innovation was that the SND rate was devised and quantified.
文摘同步硝化反硝化（simultaneous nitrification and denitrification，简称SND）是氧化沟工艺实现优良脱氮效果的主要原因，为了较好实现SND，采用ORP作为氧化沟工艺SND的控制参数．采用缺氧-厌氧-氧化沟模型对市政污水进行了生物脱氮研究．UORP在-30～30mV，NH4^＋和NO3^-的含量均比较低，发生了较好的SND；UORP在30mV以上，出水的总无机氮（TIN）中95％以上为NO3^-，该状况下硝化效果良好，UORP在-30mV以下，硝化不充分，出水的TIN中78％以上为NH4^＋；UORP在-30～30mV，TN的去除率在88％以上，SND作用去除的NO3^-占总的NO3^-去除的99％以上；氧化沟中的NH4^＋和NO3^-之比的对数与UORP有着很好的相关性，相关系数R=-0．97．
