Campo Riccardo, Sguanci Sara, Caffaz Simone, Mazzoli Lorenzo, Ramazzotti Matteo, Lubello Claudio, Lotti Tommaso
Department of Civil and Environmental Engineering - (DICEA), University of Florence, Florence, Italy.
Department of Civil and Environmental Engineering - (DICEA), University of Florence, Florence, Italy.
Bioresour Technol. 2020 Jun;305:122961. doi: 10.1016/j.biortech.2020.122961. Epub 2020 Feb 7.
This work reports on simultaneous nitrification, denitrification and phosphorus removal treating real domestic wastewater with low carbon/nitrogen (C/N) ratio by aerobic granular sludge (AGS). Operations at high sludge retention time (SRT = 61 ± 24 days) resulted in low biomass yield per chemical oxygen demand removed (COD) (0.21 ± 0.01 gCOD/gCOD), lower COD demand for denitrification as well as high effluent quality in terms of total suspended solids (TSS) (22 ± 7 mgTSS/L). The average ratio between the biodegradable soluble COD stored anaerobically as polyhydroxyalkanoates (PHAs) and the N removed was 3.1 ± 0.6 gCOD/gN, suggesting that nitrification/denitrification occurred partly via the nitrite pathway. Results revealed that stable AGS process with high C/N/P removal efficiency of 84/71/96% can be obtained besides a low organic loading rate (0.43 ± 0.11 g COD/L/d) and influent C/N ratio (3.8 ± 1.6 g/g), resulting in a high effluent quality characterized by 25 ± 6 mg sCOD/L, 0.09 ± 0.07 mgPO-P/L, 9 ± 2 mgTIN/L (10 ± 2 mgTN/L) and 22 ± 7 mgTSS/L.
本研究报道了采用好氧颗粒污泥（AGS）处理低碳氮比（C/N）的实际生活污水时实现同步硝化、反硝化和除磷的情况。在高污泥龄（SRT = 61 ± 24天）条件下运行，每去除单位化学需氧量（COD）的生物量产量较低（0.21 ± 0.01 gCOD/gCOD），反硝化所需的COD较低，且总悬浮固体（TSS）方面的出水水质较好（22 ± 7 mgTSS/L）。厌氧储存为聚羟基脂肪酸酯（PHA）的可生物降解溶解性COD与去除的氮之间的平均比值为3.1 ± 0.6 gCOD/gN，这表明硝化/反硝化部分通过亚硝酸盐途径发生。结果表明，除了低有机负荷率（0.43 ± 0.11 g COD/L/d）和进水C/N比（3.8 ± 1.6 g/g）外，还可获得具有84/71/96%的高C/N/P去除效率的稳定AGS工艺，从而实现高质量的出水，其特征为25 ± 6 mg sCOD/L、0.09 ± 0.07 mgPO-P/L、9 ± 2 mgTIN/L（10 ± 2 mgTN/L）和22 ± 7 mgTSS/L。
