What is the Best Biological Process for Nitrogen Removal: When and Why?,Environmental Science & Technology

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What is the Best Biological Process for Nitrogen Removal: When and Why?
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-03-15 00:00:00 , DOI: 10.1021/acs.est.7b05832
Perry L. McCarty ₁

Affiliation

Many different aerobic and anaerobic biological processes and treatment schemes are available for transforming organics and/or removing nitrogen from domestic wastewaters. Significant reductions in oxygen requirements and absence of a need for organics for nitrogen reduction are often indicated as advantageous for using the newer anammox organism approach for nitrogen removal rather than the traditional nitrification/denitrification method, the most common one in use today. However, treatment schemes differ, and there are some in which such suggested advantages may not hold. When nitrification/denitrification is used, an anoxic tank is now commonly used first and the nitrate formed by nitrification later is recycled back to that tank for oxidation of wastewater organics. This greatly reduces oxygen requirements and the need for adding organics. So when are such claims correct and when not? What factors in wastewater composition, regulatory requirements, and treatment flow sheet alter which treatment process is best to use? As an aid in making such judgments under different circumstances, the stoichiometry of the different biological processes involved and the different treatment approaches used were determined and compared. Advantages of each as well as imitations and potential opportunities for research to prevent them are presented.

中文翻译：

脱氮的最佳生物过程是什么：何时以及为什么？

许多不同的需氧和厌氧生物过程和处理方案可用于转化有机物和/或从生活废水中去除氮。氧气用量的显着降低以及不需要有机物进行氮还原通常被认为有利于使用更新的厌氧生物去除氮的方法，而不是传统的硝化/反硝化方法，后者是当今最常用的方法。但是，治疗方案不同，并且在某些方案中可能无法保持这种建议的优势。当使用硝化/反硝化时，现在通常首先使用缺氧槽，然后将硝化形成的硝酸盐循环回该槽，以氧化废水中的有机物。这大大降低了对氧气的需求，并减少了添加有机物的需要。那么，这种主张何时正确，何时不正确？废水成分，法规要求和处理流程中的哪些因素改变了最适合使用的处理工艺？为了在不同情况下做出这样的判断，确定并比较了所涉及的不同生物学过程的化学计量以及所使用的不同治疗方法。介绍了每种方法的优点以及为防止它们而进行研究的模仿和潜在机会。确定并比较了所涉及的不同生物学过程的化学计量以及所使用的不同处理方法。介绍了每种方法的优点以及为防止它们而进行研究的模仿和潜在机会。确定并比较了所涉及的不同生物学过程的化学计量以及所使用的不同处理方法。介绍了每种方法的优点以及为防止它们而进行研究的模仿和潜在机会。

更新日期：2018-03-15

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