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Effect of Aeration on Nutrient Removal Performance of Oxidation Ditch Systems

机译：曝气对氧化沟系统养分去除性能的影响

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This paper evaluates the mechanism of nutrient removal in an oxidation ditch system using basic process stoichiometry and model simulation. Aeration intensity and the resulting dissolved oxygen concentration are identified as the main parameters defining the denitrification potential, and affecting the extent of ni-trification/denitrification processes, mainly because no clear anoxic/aerobic zones can be established in the system. For wastewater characteristics and a wastewater scheme tested with model simulation using ASM2d, process efficiency is highly influenced by the dissolved oxygen concentration in a narrow range of 0.4-0.8 mg/L. Enhanced biological phosphorus removal is also affected through the level of nitrate recycle into the anaerobic reactor. Diurnal variations in the influent at a constant aeration regime result in insufficient aeration during peak loads followed by overaerated periods, and in this way, cause temporal instability in nutrient removal performance. With the aid of dynamic simulations, the dissolved oxygen set-point control provides better effluent quality and process stability in terms of nutrient removal.
机译：本文使用基本过程化学计量和模型模拟来评估氧化沟系统中养分去除的机理。曝气强度和所产生的溶解氧浓度被确定为定义反硝化潜力并影响硝化/反硝化过程程度的主要参数，这主要是因为无法在系统中建立清晰的缺氧/好氧区。对于废水特性和使用ASM2d通过模型仿真测试的废水方案，工艺效率受0.4-0.8 mg / L的窄范围内的溶解氧浓度的很大影响。硝酸盐循环进入厌氧反应器的水平也影响了生物除磷的提高。在恒定曝气状态下进水的昼夜变化会导致峰值负荷期间的曝气不足，随后出现过度曝气期，从而导致养分去除性能的时间不稳定。借助动态模拟，溶解氧设定点控制可在去除营养物方面提供更好的废水质量和过程稳定性。

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