多级AO工艺短程硝化反硝化的启动与运行调控

Start-Up and Operation Regulation of Shortcut Nitrification-Denitrification in Multi-Stage AO Processes

采用处理水量为0.15 m^(3)/h的中试装置,开展多级AO工艺耦合短程硝化反硝化处理低C/N城市污水试验研究,通过优化溶解氧控制、污泥浓度及进水分配比,探究最佳运行工况,并通过分析各工况下的氮组分变化,探讨实现短程硝化反硝化的触发条件。结果表明,水温为14℃以上时,通过微氧运行、增大污泥浓度、进水分配比设为30%∶10%∶30%∶30%,出水可实现优于一级A排放标准,并实现了部分短程硝化反硝化,降低了12.5%的曝气量和20%的碳源需求,为今后污水处理厂的提标改造和节能降耗提供技术支持。

A test device with treatment scale of 0.15 m^(3)/h was used to carry out a multi-stage AO processes coupled with SND to treat low C/N urban wastewater.The optimal operating conditions were explored by optimizing dissolved oxygen control,sludge concentration and influent distribution ratio.The trigger conditions for shortcut nitrification-denitrification were discussed by analyzing the changes of nitrogen components under various operating conditions.The results showed that when the water temperature was above 14℃,through micro oxygen operation,increasing sludge concentration and setting the influent distribution ratio as 30%∶10%∶30%∶30%,the effluent can be better than the first-class A discharge standard.Also,partial shortcut nitrification-denitrification was realized,reducing the aeration volume and carbon source demand by 12.5%and 20%,so as to provide technical support for the upgrading and transformation of WWTP and energy conservation and consumption reduction in the future.