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首页> 外文会议>Water Environment Federation 75th annual technical exhibition amp; conference (WEFTEC 2002) >Evaluation of Several Water Reclamation Facilities Employing Biological Nutrient Removal In North Carolina
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Evaluation of Several Water Reclamation Facilities Employing Biological Nutrient Removal In North Carolina

机译：北卡罗莱纳州几种利用生物营养去除的水回收设施的评估

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摘要

As an increasing number of lakes and streams are being classified as impaired or nutrientrnsensitive, a greater burden is placed on municipalities to comply with water quality restrictions.rnDuring the past decade in North Carolina, specifically in the Neuse River and Tar-Pamlico RiverrnBasins, many municipalities were required to upgrade their wastewater treatment plants forrnnutrient removal capability, either nitrogen or phosphorus or both. Municipalities discharging tornthe Neuse River Basin are required to meet some of the most stringent effluent limits in NorthrnCarolina. All streams and rivers in the Neuse River Basin were classified as nutrient sensitivernwaters and a 2.0 mg/L phosphorus limit was imposed on direct discharge facilities. A TotalrnMaximum Daily Load (TMDL) for a 30% nitrogen reduction goal was also imposed in thernNeuse Basin. The Tar-Pamlico River Basin was declared nutrient sensitive in the late 1980’s forrnnitrogen and phosphorus, and a goal was established to reduce nitrogen and phosphorus inrncombination by 30% compared to 1991 levels. The purpose of this paper is to provide anrnevaluation and overview of several biological nutrient removal facilities currently in operation inrnthe Neuse River and Tar-Pamlico River Basins of North Carolina.rnA flexible design of a wastewater treatment plant is critical to meeting nutrient limits underrnchanging regulation and possibly changing influent wastewater characteristics. The selectedrnfacilities are almost fully optimized for biological nutrient removal, even under carbon limitedrninfluent conditions. All of the facilities discharge nitrogen and/or phosphorus at current effluentrnlimits below what is required by the permit. It is likely that these facilities will be able to meetrnan additional 10% reduction in nitrogen in the near term and will most likely meet an additionalrnnitrogen reduction requirement in the future. Although, as the target effluent nitrogenrnconcentration decreases the probability of compliance may decrease. Achieving a lower targetrnconcentration of effluent nitrogen will be less probable based on day-to-day plant operationsrnunder dynamic conditions.
机译：随着越来越多的湖泊和溪流被归类为对营养不良或敏感的湖泊，越来越多的市政当局不得不遵守水质限制。在过去的十年中，北卡罗来纳州，特别是Neuse河和Tar-Pamlico Riverrn盆地，许多要求市政当局升级其废水处理厂的氮素，磷素或两者的养分去除能力。要求向Neuse河流域排放污水的市政当局必须满足NorthrnCarolina地区一些最严格的污水排放限制。 Neuse河流域的所有溪流和河流都被归类为对营养敏感的水，直接排放设施的磷含量限制为2.0 mg / L。在Neuse盆地还实施了总氮最大负荷量（TMDL）以实现30％的氮削减目标。塔尔-帕米利科河流域在1980年代末期的氮和磷被宣布对养分敏感，并制定了一个目标，与1991年相比，氮和磷的混合减少30％。本文的目的是提供对北卡罗来纳州Neuse河和Tar-Pamlico河流域目前正在运行的几种生物营养去除设施的评价和概述。废水处理厂的灵活设计对于满足不断变化的法规和要求下的营养限至关重要。可能会改变进水的废水特性。所选设施几乎完全优化了生物营养的去除，即使在碳浓度有限的条件下也是如此。所有设施排放的氮和/或磷的排放限值均低于许可证要求的水平。这些设施很可能将在短期内满足氮减少10％的要求，并且将来极有可能满足氮减少的额外要求。尽管随着目标流出物氮浓度的降低，顺应性的可能性可能会降低。根据动态条件下工厂的日常运行，实现较低的排放氮目标浓度的可能性较小。

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