Department of Chemistry and Bioscience, Center for Membrane Technology, Aalborg University, Aalborg, Denmark.
Department of Chemistry and Bioscience, Center for Membrane Technology, Aalborg University, Aalborg, Denmark.
Sci Total Environ. 2022 Nov 10;846:157532. doi: 10.1016/j.scitotenv.2022.157532. Epub 2022 Jul 22.
Organic compounds in wastewater are required for the biological removal of nitrogen, but they can also be used for biogas production. Distribution of the internal organic carbon at the plant is therefore critical to ensure high quality of the treated water, reduce greenhouse gas emissions, and optimize biogas production. We describe a wastewater treatment plant designed to focus equally on energy production, water quality, and reduced emissions of greenhouse gases. A disk filter was installed to remove as much carbon as possible during primary treatment. Primary sludge was then hydrolyzed and centrifuged. The hydrolysate centrate contained volatile fatty acids and was used either for the secondary wastewater treatment or to produce biogas. The yield during hydrolysis was 30-35 g volatile fatty acid per kg dry material or 40-65 g soluble COD per kg total solid. The specific denitrification rate was 20-40 g/(g·min), which is on the same order of magnitude as that for commonly used external carbon sources. Hydrolysis at around 35 °C and pH 7 gave the best results. The hydrolysate centrate can be stored and added to the biological treatment to improve water quality and reduce emissions of nitrous oxide or it can be used to produce biogas to optimize the operation of the plant.
废水中的有机化合物是生物脱氮所必需的，但它们也可以用于沼气生产。因此，工厂内部有机碳的分布对于确保处理水的高质量、减少温室气体排放和优化沼气生产至关重要。我们描述了一种污水处理厂的设计，该设计旨在平等关注能源生产、水质和减少温室气体排放。安装了盘式过滤器以在初级处理过程中尽可能多地去除碳。然后对初级污泥进行水解和离心。水解液浓缩物含有挥发性脂肪酸，可用于二级废水处理或用于生产沼气。水解过程中的产率为每公斤干物质 30-35 克挥发性脂肪酸或每公斤总固体 40-65 克可溶解性 COD。特定的反硝化速率为 20-40 g/（g·min），与常用的外部碳源相当。在 35°C 左右和 pH 值为 7 时，可获得最佳结果。水解液浓缩物可储存并添加到生物处理中，以改善水质并减少氧化亚氮的排放，或者可用于生产沼气，以优化工厂的运行。
