National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
Sci Total Environ. 2023 Dec 15;904:165837. doi: 10.1016/j.scitotenv.2023.165837. Epub 2023 Jul 28.
To date, studies on the effect of sewage disturbances on treatment facilities were based on fixed-length flow variations, which are incapable of imitating the actual dynamic flow characteristics of municipal sewage. Here, an innovative dynamic influent disturbance control system is established in this study and applied in a novel denitrifying phosphorus removal (anaerobic anoxic oxic-biological contact oxidation, AAO-BCO) system to simulate seasonal and diurnal sewage fluctuations in laboratory-scale experiments. The results showed that, under sinusoidal influent flow perturbation, the effluent pollutant content followed a relatively gentle sinusoidal trend and did not always result in desired level of pollutant removal. The ability of the system to cope with sinusoidal flow variations was susceptible to the amplitude of diurnal sewage fluctuation, while stronger tolerance capacity was observed to seasonal and momentary increase in wastewater flowrate. There was also a discrepancy in the system buffering capacity towards various pollutants removal (COD > TIN > PO), which may be attributed to wide fluctuations in PO/NO and different decrease in metabolic activity of denitrifying phosphorus removal (DPR) sludge caused by extreme hydraulic retention times. To improve the robustness and stability of the DPR system, a regulating strategy was proposed to alleviate the biomass reduction and uncoordinated PO/NO.
迄今为止，有关污水干扰对处理设施影响的研究主要基于固定长度的流量变化，而这种方法无法模拟城市污水的实际动态流动特性。在本研究中，建立了一种创新的动态进水扰动控制系统，并将其应用于新型的反硝化除磷（厌氧-缺氧-好氧-生物接触氧化，AAO-BCO）系统中，以在实验室规模的实验中模拟季节性和日变化污水波动。结果表明，在正弦进水流量扰动下，出水污染物含量呈现出相对平缓的正弦趋势，并不总是能达到预期的污染物去除效果。该系统应对正弦流量变化的能力容易受到日污水波动幅度的影响，而对季节性和瞬时污水流量增加的耐受能力较强。该系统对各种污染物去除的缓冲能力（COD > TIN > PO）存在差异，这可能是由于 PO/NO 波动较大，以及由于极端水力停留时间导致反硝化除磷（DPR）污泥代谢活性下降，造成 DPR 污泥的生物量减少和 PO/NO 失调。为了提高 DPR 系统的鲁棒性和稳定性，提出了一种调节策略，以减轻生物量减少和 PO/NO 失调的问题。
