【摘要】 【目的】针对污水处理厂在提标改造过程中面临的进水碳源不足和氮磷浓度偏高的技术难题，本文旨在通过在厂区搭建一套采用Bardenpho工艺的中试装置，对关键运行参数进行优化，以提高脱氮效率并兼顾化学需氧量(COD)和总磷(TP)的去除效果。通过调整碳源投加位置、投加量、混合液回流比以及多点进水分配比例等参数，系统研究了不同工况下的脱氮除磷效果。【方法】试验分为3个阶段：第一阶段，Bardenpho工艺最佳碳源投加点研究；第二阶段，碳源投加量与内回流比参数组合研究；第三阶段，多点进水优化污染物去除性能研究。并基于3个阶段的研究结果，本文提出Bardenpho工艺强化脱氮策略。【结果】Bardenpho工艺最佳碳源投加点为后置缺氧区，在该处投加碳源更有利于系统脱氮效率的提升，同时还能兼顾COD和TP的去除效果。当碳源投加量为38.63 mg/L,内回流比为300%时，兼顾了脱氮除磷的效果和运行成本，其出水总氮(TN)质量浓度为8.15 mg/L,出水TP质量浓度为0.3 mg/L,运行成本为0.293元/m~3。投加碳源能有效降低出水TN,但同时有可能导致出水COD超标，使得脱氮成本过高。增加内回流比可获得更好的脱氮效果，当内回流比超过400%后，将导致回流设施能耗较高，且回流液溶解氧升高，不利于脱氮反应。当进水碳氮比(C/N)为3～4时，可通过多点进水的方式在不投加外碳源的情况下有效提高脱氮除磷。当进水分配比例为预缺氧区∶缺氧区∶后置缺氧区=6∶3∶1时，可以确保TN质量浓度<11 mg/L,TP质量浓度<0.5 mg/L。【结论】本文通过中试装置的运行参数优化，能够有效提高碳源利用率，实现高效脱氮和除磷，同时保证了较低的脱氮成本。结果对于指导污水处理厂的实际运行和提标改造具有重要的实际意义。更多还原

【Abstract】 [Objective] In response to the technical challenges faced by wastewater treatment plants during the upgrading and renovation process, such as insufficient carbon sources and high nitrogen and phosphorus concentrations in the influent, this paper aims to optimize key operating parameters by building a pilot plant using the Bardenpho process in the plant area, in order to improve denitrification efficiency while considering the removal effects of chemical oxygen demand(COD) and total phosphorus(TP). The denitrification and phosphorus removal effects under different operating conditions are systematically studied by adjusting parameters such as carbon source feeding position, feeding amount, mixed liquid reflux ratio, and multi-point influent distribution ratio.[Methods] The experiment was divided into three stages: The first stage was to study the optimal carbon source injection point for Bardenpho process; In the second stage, researched on the combination of carbon source dosage and internal reflux ratio parameters; In the third stage, researched on optimizing pollutant removal performance through multi-point influent. And based on the research result of the three stages, it proposed an enhanced denitrification strategy for the Bardenpho process.[Results] The optimal carbon source injection point for the Bardenpho process was in the post anoxic zone, where the addition of carbon source was more conducive to improving the denitrification efficiency of the system, while also achieving the removal effects of COD and TP. When the carbon source dosage was 38.63 mg/L and the internal reflux ratio was 300%, it balanced the effect of nitrogen and phosphorus removal and operating costs. The effluent total nitrogen(TN) was 8.15 mg/L, the effluent TP was 0.3 mg/L, and the operating cost was 0.293 yuan. Adding carbon sources could effectively reduce TN in effluent, but at the same time, it may lead to excessive COD in effluent, resulting in high denitrification costs. Increasing internal reflux ratio could achieve better denitrification effect. When the internal reflux ratio exceeded 400%, it will result in higher energy consumption of the reflux facility and an increase in dissolved oxygen in the reflux solution, which was not conducive to denitrification reaction. When the influent C/N ratio was 3-4, nitrogen and phosphorus removal could be effectively improved through multi-point influent without adding external carbon sources. When the ratio of pre anoxic zone∶anoxic zone∶post anoxic zone=6∶3∶1, it could ensure TN<11 mg/L and TP<0.5 mg/L.[Conclusion] This paper optimizes the operating parameters of the pilot plant to effectively improve carbon source utilization, achieves efficient denitrification and phosphorus removal, and ensure lower denitrification costs. The research results have important practical significance for guiding the actual operation and upgrading of sewage treatment plants.更多还原