Center for Microbial Communities, Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg, Denmark; Key Laboratory of Engineering Oceanography, Second Institute of Oceanography, SOA, Hangzhou 310012, China.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 10085, China.
Waste Manag. 2018 May;75:280-288. doi: 10.1016/j.wasman.2018.02.021. Epub 2018 Mar 2.
Foaming in anaerobic digestion (AD) systems for biogas generation can give serious operational problems. The cause of such foaming events is often unclear, and it is therefore not an easy task to predict and subsequently apply preventative measures. Methods for the measurement of the foaming potential of digester sludge are often implemented, but no standardized method is available. In this study, we investigated parameters influencing the foam formation during experimental aeration tests of full-scale digester sludge, including air flow, time, and total solids concentration, and proposed an optimized method for standard use. In a survey of 16 full-scale AD systems located at wastewater treatment plants in Denmark, all sludge samples were classified into three groups (non-foaming, pre-foaming, and actually foaming) according to their foam height/propensity and stability. Extensive surveillance of plants with the proposed classification system will enable the determination of cut-off values to help to identify foaming or pre-foaming sludge, and to associate these with operational conditions leading to foaming episodes.
在沼气生成的厌氧消化 (AD) 系统中产生泡沫会导致严重的运行问题。此类泡沫事件的原因通常不明确，因此难以预测并随后采取预防措施。通常会实施用于测量消化污泥起泡潜力的方法，但没有可用的标准化方法。在这项研究中，我们研究了在全规模消化污泥的实验曝气测试中影响泡沫形成的参数，包括空气流量、时间和总固体浓度，并提出了一种优化的标准使用方法。在对丹麦 16 个位于污水处理厂的全规模 AD 系统的调查中，根据泡沫高度/倾向和稳定性，将所有污泥样品分为三组（无泡沫、预泡沫和实际泡沫）。对采用提议的分类系统的工厂进行广泛监测，将有助于确定截止值，以帮助识别泡沫或预泡沫污泥，并将这些值与导致泡沫事件的操作条件相关联。
