The aerobic granular sludge process is an alternative to the conventional activated sludge process adopted in water resource recovery facilities. This study presents the first independent assessment of aerobic granular sludge technology in terms of oxygen transfer efficiency and nutrient removal performance. Using off-gas testing, a full-depth pilot reactor with granular biomass was compared to an identical reactor with floccular biomass. The granular process presented lower oxygen transfer efficiency than the floccular sludge (2.3%/m vs. 3.2%/m, respectively). The granular sludge was also tested at different operating conditions in order to address potential retrofitting for existing aeration basins. With regard to oxygen transfer efficiency, the experiments show a marginal improvement at lower MLSS (0.2%/m) and at medium side-water-depth (0.3%/m). Satisfactory effluent water quality levels, in terms of nitrogen and phosphorous removal, were obtained for the granular sludge except for decreased MLSS conditions during which the nitrification/denitrification process was highly penalized.

中文翻译：

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好氧颗粒污泥反应器中的氧转移研究

好氧颗粒污泥工艺是水资源回收设施中采用的常规活性污泥工艺的替代方法。这项研究提出了关于氧转移效率和养分去除性能的第一个独立评估的好氧颗粒污泥技术。使用废气测试，将具有颗粒状生物质的全深度中试反应器与具有絮状生物质的相同反应器进行了比较。粒状工艺的氧转移效率比絮状污泥低（分别为2.3％/ m和3.2％/ m）。还对颗粒状污泥在不同的操作条件下进行了测试，以解决对现有曝气池的潜在改造。关于氧气传输效率，实验表明，在较低的MLSS（0.2％/ m）和中等水边深度（0）下，边际改善。3％/ m）。对于颗粒状污泥，除氮和磷的去除外，获得了令人满意的污水水质水平，但降低了MLSS条件，在此期间硝化/反硝化过程受到了严重惩罚。