Carrousel氧化沟内特性参数的分布

The distribution of key parameters in Carrousel oxidation ditch.

为提高Carrousel氧化沟的脱氮能力,对长沙第二污水处理厂的Carrousel氧化沟工艺进行了现场测试,研究了氧化沟中流速、溶解氧以及污泥浓度在不同曝气机开启条件下的分布变化特征,并分析了其对同步硝化反硝化过程发生的环境条件的影响.结果表明,流速、溶解氧以及污泥浓度的空间分布特征受曝气机的开启条件影响显著,沟内溶解氧浓度随时间变化较大.开启5台曝气机时,溶解氧和流速均偏高,污泥混合更加均匀,开启3台曝气机时中沟段存在流速过低区域(<0.15m/s);适当降低曝气机开启台数,并根据系统条件变化动态调节,可以为实现氧化沟同步硝化反硝化过程创造较好的工艺条件.

To enhance nitrogen removal, a systemic monitoring of the biological and hydrological parameters of Carrousel oxidation ditch in Changsha second wastewater treatment plant was carried out to study the feasibility of simultaneous nitrification and denitrification （SND）. The variation and distribution of parameters such as flow velocity, the concentration of dissolved oxygen（DO） and mixed liquor suspended solids （MLSS） in oxidation ditch were measured and analysed, which were major control factors for SND. The dimensional distribution of flow velocity, DO and MLSS were affected markedly by the open condition of the fans, DO along the ditch changed obviously with time. DO and flow velocity were higher and the mixing of MLSS was sufficient when five fans were opened, while there was lower flow velocity （〈0.15m/s） in middle ditch when three fans were opened. The feasible operation conditions for SND were lower dissolved oxygen concentration, lower flow velocity and higher concentration of MLSS.