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Nitrification and the impact of organic matter in fixed-film biofilters: Application to recirculating aquaculture systems.

机译：固定膜生物滤池中的硝化作用和有机物的影响：在循环水产养殖系统中的应用。

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摘要

Inhibition is significant within fixed-film nitrification processes in wastewater treatment systems with high carbonaceous material due to the competition between heterotrophic and nitrifying bacteria for limited oxygen and space. The inhibition of organic matter to the nitrification processes becomes more critical in recirculating aquaculture systems that contain a low concentration of ammonia and a high concentration of organic matter. Quantitative information on the effect of organic matter upon nitrification is insufficient. Additionally, application of results from pure culture systems to biofilter design can lead to inaccurate estimations. In this research, the effect of organic matter on nitrification biofilters was investigated experimentally with a lab-scale reactor series system and theoretically with a mathematical biofilm model. To extend this research to aquaculture system design and operation, the results from the lab-scale study were compared with pilot and commercial scale systems and biofilter design recommendations were provided for cold water aquaculture systems. The results from these studies showed that the biofilter nitrification rate decreased exponentially with increases in COD/N ratio although the degree of inhibition on nitrification varied with different types of biofilters. Taking into account these results, a mathematical biofilm model was developed to demonstrate the inhibition due to addition of organic matter on nitrification and a simplified analytical solution was obtained for practical applications. A correction factor of 0.2∼1.0 representing the effect of organic matter and a correction factor of 0.2∼0.9 associated with the effect of system scale-up were recommended when the nitrification design equations resulted from a pure culture measurement were applied in the design of commercial scale biofilters.
机译：在含碳量较高的废水处理系统中，固定膜硝化过程中的抑制作用非常明显，这是由于异养菌和硝化细菌在有限的氧气和空间中竞争所致。在再循环包含低浓度氨和高浓度有机物的水产养殖系统中，有机物对硝化过程的抑制变得更加关键。关于有机物对硝化作用影响的定量信息不足。此外，将纯培养系统的结果应用于生物滤池设计可能会导致估算不准确。在这项研究中，通过实验室规模的反应器串联系统对有机物对硝化生物滤池的影响进行了实验研究，并在理论上通过数学生物膜模型进行了研究。为了将这项研究扩展到水产养殖系统的设计和运行中，将实验室规模研究的结果与中试和商业规模系统进行了比较，并为冷水水产养殖系统提供了生物滤池设计建议。这些研究的结果表明，尽管不同类型的生物滤池对硝化的抑制程度不同，但生物滤池的硝化速率随COD / N比的增加呈指数下降。考虑到这些结果，建立了数学生物膜模型以证明由于添加有机物对硝化作用的抑制作用，并为实际应用提供了简化的分析溶液。当将纯培养物测量产生的硝化设计方程式应用于商业设计时，建议使用代表有机物作用的校正系数为0.2〜1.0，并建议与系统放大作用相关的校正系数为0.2〜0.9。规模生物滤池。

著录项

  • 作者

    Ling, Jian.;

  • 作者单位

    Washington State University.;

  • 授予单位 Washington State University.;
  • 学科 Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 147 p.
  • 总页数 147
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境污染及其防治;
  • 关键词

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