Abstract：
A comprehensive case study was undertaken at the Blue Plains wastewater treatment plant (WWTP) to explore the bioaugmentation technique of introducing nitrifying sludge into the non-nitrifying stage over the course of two operational years. This innovative approach involved the return of waste activated sludge (WAS) from the biological nutrient removal (BNR) system to enhance the nitrification in the high carbon removal rate system. The complete ammonia oxidizer (comammox) Nitrospira Nitrosa was identified as the main nitrifier in the system. Bioaugmentation was shown to be successful as nitrifiers returned from BNR were able to increase the nitrifying activity of the high carbon removal rate system. There was a positive correlation between returned sludge from the BNR stage and the specific total kjeldahl nitrogen (TKN) removal rate in A stage. The bioaugmentation process resulted in a remarkable threefold increase in the specific TKN removal rate within the A stage. Result suggested that recycling of WAS is a simple technique to bio-augment a low SRT system with nitrifiers and add ammonia oxidation to a previously non-nitrifying stage. The results from this case study hold the potential for applicable implications for other WWTPs that have a similar operational scheme to Blue Plains, allowing them to reuse WAS from the B stage, previously considered waste, to enhance nitrification and thus improving overall nitrogen removal performance. PRACTITIONER POINTS: Comammox identifying as main nitrifier in the B stage. Comammox enriched sludge from B stage successfully bio-augmented the East side of A stage up to threefold. Bioaugmentation of comammox in the West side of A stage was potentially inhibited by the gravity thickened overflow. Sludge returned from B stage to A stage can improve nitrification with a very minor retrofits and short startup times.
摘要：
在BluePlains废水处理厂（WWTP）进行了全面的案例研究，以探索在两年的运营时间内将硝化污泥引入非硝化阶段的生物强化技术。这种创新方法涉及从生物养分去除（BNR）系统中回收废活性污泥（WAS），以增强高碳去除率系统中的硝化作用。完全的氨氧化剂(comammox)NitrospiraNitrosa被确定为系统中的主要硝化剂。生物强化被证明是成功的，因为从BNR返回的硝化剂能够提高高碳去除率系统的硝化活性。BNR阶段的回流污泥与A阶段特定的凯氏定氮（TKN）去除率呈正相关。生物强化过程使A阶段的TKN比去除率显着提高了三倍。结果表明，WAS的回收是一种简单的技术，可以通过硝化器生物增强低SRT系统，并将氨氧化添加到先前的非硝化阶段。TheresultsfromthiscasestudyholdthepotentialforapplicableimplicationsforotherWWTPthathaveasimilaroperationalschemetoBluePlains,允许他们从B阶段重用WAS，以前被认为是废物，以增强硝化能力，从而提高整体脱氮性能。实践要点：Comammox识别为B阶段的主要硝化剂。来自B阶段的Comammox富集污泥成功地将A阶段的东侧生物增强了三倍。A阶段西侧的Comammox的生物增强可能被重力增稠的溢流所抑制。从B阶段返回到A阶段的污泥可以通过非常小的改造和短的启动时间来改善硝化。
