The present work aimed to study the mainstream feasibility of the deammonifying sludge of side stream of municipal wastewater treatment plant (MWWTP) in Kaster, Germany. For this purpose, the deammonifying sludge available at the side stream was investigated for nitrogen (N) removal with respect to the operational factors temperature (15–30°C), pH value (6.0–8.0) and chemical oxygen demand (COD)/N ratio (≤1.5–6.0). The highest and lowest N-removal rates of 0.13 and 0.045 kg/(m³ d) are achieved at 30 and 15°C, respectively. Different conditions of pH and COD/N ratios in the SBRs of Partial nitritation/anammox (PN/A) significantly influenced both the metabolic processes and associated N-removal rates. The scientific insights gained from the current work signifies the possibility of mainstream PN/A at WWTPs. The current study forms a solid basis of operational window for the upcoming semi-technical trails to be conducted prior to the full-scale mainstream PN/A at WWTP Kaster and WWTPs globally.

中文翻译：

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城市污水处理厂脱氨污泥主流应用的运行窗口

本工作旨在研究德国卡斯特城市污水处理厂（MWWTP）侧流脱氨污泥的主流可行性。为此，对侧流可用的脱氨污泥的氮 (N) 去除情况进行了研究，涉及操作因素温度 (15–30°C)、pH 值 (6.0–8.0) 和化学需氧量 (COD)/氮比（≤1.5–6.0）。最高和最低氮去除率 分别在 30°C 和 15°C 时达到0.13 kg/(m ³ d) 和 0.045 kg/(m 3 d)。部分亚硝化/厌氧氨氧化 (PN/A) 的 SBR 中不同的 pH 条件和 COD/N 比率显着影响代谢过程和相关的氮去除率。从当前工作中获得的科学见解表明了污水处理厂主流 PN/A 的可能性。目前的研究为即将在 WWTP Kaster 和全球污水处理厂全面主流 PN/A 之前进行的半技术试验奠定了坚实的操作窗口基础。