【摘要】 【目的】针对污水处理厂提标改造中普遍存在的生化脱氮效能受限、水力衔接困难及近远期目标协同难等痛点，文章提出切实可行的优化设计方案，为其他类似工程提供参考。【方法】以广东某20万m³/d污水处理厂提标工程为例，通过对现状构筑物、进出水水质的分析，有针对性地采取现状构筑物挖潜、新增集约化深度处理构筑物的方式实现近期目标，并兼顾与远期目标的衔接。【结果】UNITANK生反池工艺脱氮处理能力不足，近期深挖UNITANK生反池脱氮能力，通过投加碳源，必要时通过增加填料提高微生物浓度从而提高脱氮和除碳效率，将除磷转移至新增深度处理构筑物来实现。面临前端生反池水位和后端接触消毒池水位均受限的不利条件，通过精细化的水力计算和巧妙地设计参数，很好地实现了新增构筑物的水流顺畅，稳定运行。通过集约化布置和采用节地型“高效沉淀池+精密过滤”组合，近期用地指标仅为0.038 m²/(m³·d^-1),较国标节约85%。在平均处理水量超负荷7.8%工况下，提标改造工程仍能经济、稳定运行，吨水运行成本仅增加0.18元。【结论】污水处理厂提标工程要基于现状条件，通过现状构筑物充分挖潜与新增构筑物强化相结合，经济合理地实现工程目标。更多还原

【Abstract】 [Objective] To address the prevalent challenges in wastewater treatment plant（WWTP） upgrading projects, including limited biochemical nitrogen removal efficiency, hydraulic connection difficulties, and the coordination of short-and long-term goals, this paper aims to propose practical and feasible optimization design schemes that can serve as a reference for other similar projects.[Methods] Taking the upgrading project of a 200 000 m³/d WWTP in Guangdong as an example, the existing structures and influent and effluent quality are analyzed. Targeted measures are taken to tap the potential of existing structures and add new intensive advanced treatment structures to achieve short-term goals, while also considering the connection with long-term goals.[Results] The nitrogen removal capacity of the UNITANK bio-reactor process is insufficient. To address this problem, the nitrogen removal capacity of the UNITANK bio-reactor tank is further explored in the short term by adding carbon sources and, when necessary, increasing the microbial concentration through the addition of fillers to enhance nitrogen and carbon removal efficiency. Phosphorus removal is transferred to the newly added depth treatment structures. Faced with the adverse conditions of limited water levels in both the front-end bio-reactor tank and the rear-end contact disinfection tank, refined hydraulic calculations and clever selection of design parameters are employed to achieve smooth water flow and stable operation of the newly added structures. Through intensive layout and the adoption of land-saving "high-efficiency sedimentation tank + precision filtration" combinations, the land use indicator in the recent phase is only 0.038 m²/(m³·d^-1), representing an 85% savings compared to national standards. Under operating conditions where the average treated water volume exceed the design capacity by 7.8%, the upgraded project can still operate economically and stably, with the operating cost per ton of water increasing by only 0.18 yuan.[Conclusion] WWTP upgrading projects should be based on existing conditions, combining the full tapping of the potential of existing structures with the reinforcement of new structures to achieve project goals economically and reasonably.更多还原