【摘要】 在活性污泥释磷规律研究的基础上进行中试,对常规A2/O工艺进行改进,提出适用于低碳源城市污水的强化脱氮除磷工艺。结果表明:富磷污泥中的NO3--N浓度较高时,在厌氧开始的一段时间内,反硝化吸磷使PO34--P浓度不断降低,当NO3--N由2.75 mg/L降至接近于零时才开始表现出释磷;对于低碳源城市污水,由于大量未被反硝化的NO3--N随回流污泥进入厌氧区,干扰厌氧释磷的正常进行,导致常规A2/O工艺的除磷效果较差,出水TP平均浓度为1.04 mg/L;调整厌氧、缺氧、好氧停留时间比进行强化厌氧后,出水TP平均浓度为0.48 mg/L,达到了GB 18918—2002标准的一级A标准,去除率较常规A2/O工艺提高了21%,同时出水COD、TN、NH3-N也能稳定地达到一级A标准。更多还原

【Abstract】 Based on the rule of phosphorus release from activated sludge,a pilot research was conducted to improve the conventional A2/O process.The enhanced nitrogen and phosphorus removal from municipal wastewater with low carbon source was studied.The results demonstrate that at the beginning of phosphorus release from activated sludge with a high concentration of NO-3-N,the concentration of PO3-4-P is gradually decreased because of the P-uptake by denitrification.When the concentration of NO-3-N is decreased from 2.75 mg/L to near zero,phosphorus release begins.For municipal wastewater with a low carbon source,because a large amount of NO-3-N which are not denitrified return to the anaerobic tank,the anaerobic phosphorus release is disrupted,which causes the poor phosphorus removal efficiency in the conventional A2/O process.The effluent concentration of TP is 1.04 mg/L.By adjusting the anaerobic,anoxic and aerobic duration ratio and intensifying the anaerobic process,the effluent concentration of TP becomes 0.48 mg/L,which meets the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).Compared to the conventional A2/O process,the removal rate of TP is increased by 21%.The concentrations of COD,TN,NH3-N in the effluent can meet the first level A criteria.更多还原