School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China; Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun 130118, China.
School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China.
J Environ Sci (China). 2020 May;91:212-221. doi: 10.1016/j.jes.2020.02.010. Epub 2020 Feb 20.
The aluminum ions generated from mining aluminum, electrolytic aluminum and the industrial production of aluminum-based coagulants (such as AlCl and Al(SO)) enter sewage treatment plants and interact with activated sludges. An anaerobic/anoxic/oxic (AO) process was used to reveal the effects of Al on the pollutant removal efficiencies, bioflocculation and the microstructure of sludge. The results showed that a low concentration of Al improved the pollutant removal efficiencies and increased the sludge particle size. However, a high concentration of Al hindered microbial flocculation and reduced the pollutant removal efficiencies. With a 10 mg/L Al addition, the chemical oxygen demand (COD), total nitrogen (TN) and NH-N increased by 3%, 16% and 27%, and reached as high as 68%, 60% and 87%, respectively. At the same time, the dehydrogenase activity, flocculation ability (FA) and contact angle of the sludge reached their maximum levels at 41.3 mg/L/hr, 45% and 79.63°, respectively. The specific surface area of the sludge decreased to 7.084 m/g and the sludge pore size distribution shifted to concentrate in the mesoporous range. Most of Al was adsorbed on the surface of sludge, changing the physicochemical properties and physical structure of the sludge.
从开采铝、电解铝和生产基于铝的混凝剂（如 AlCl 和 Al(SO)）的工业中产生的铝离子进入污水处理厂，并与活性污泥相互作用。采用厌氧/缺氧/好氧（AO）工艺揭示了 Al 对污染物去除效率、生物絮凝和污泥微观结构的影响。结果表明，低浓度的 Al 提高了污染物去除效率并增加了污泥粒径。然而，高浓度的 Al 阻碍了微生物絮凝并降低了污染物去除效率。添加 10mg/L 的 Al 后，化学需氧量（COD）、总氮（TN）和 NH-N 分别增加了 3%、16%和 27%，分别高达 68%、60%和 87%。同时，污泥的脱氢酶活性、絮凝能力（FA）和接触角分别在 41.3mg/L/hr、45%和 79.63°达到最大值。污泥的比表面积降至 7.084m/g，污泥孔径分布向中孔范围集中。大部分 Al 被吸附在污泥表面，改变了污泥的物理化学性质和物理结构。
