Islam Md Saiful, Ranade Vivek Vinayak
Dairy Processing Technology Centre, Bernal Institute, Department of Chemical Sciences, University of Limerick, Limerick V94 T9PX, Ireland.
Dairy Processing Technology Centre, Bernal Institute, Department of Chemical Sciences, University of Limerick, Limerick V94 T9PX, Ireland E-mail:
Water Sci Technol. 2025 May;91(9):1032-1043. doi: 10.2166/wst.2025.056. Epub 2025 Apr 24.
This study introduces a co-digestion and vortex-based hydrodynamic cavitation (HC) pretreatment of brown and dissolved air flotation (DAF) sludge derived from dairy processing waste streams to enhance biomethane potential (BMP). Co-digestion experiments were carried out for varying ratios of brown-to-DAF sludge (1:1, 2%; 3:1, 4%). The BMP tests, conducted at 39 °C using a 15-reactor system with a 400 mL reaction volume and overhead stirrers, demonstrated that HC treatment elevated soluble chemical oxygen demand (sCOD) of brown and DAF sludges by over 34% after 80 passes through HC device. Combining DAF with brown sludge improved methane yields and reduced the time to reach peak BMP. Loading 2% volatile solids (VS) with a 1:1 ratio resulted in methane production exceeding 90% of theoretical BMP, surpassing individual brown and DAF sludge BMPs (73 and 84%, respectively). Maximum VS removal surpassed 85%, achieving a peak methane yield of over 717 mL/g-VS. These findings offer insights into addressing effluent treatment challenges and highlight the potential of co-digestion for enhanced waste valorisation.
本研究介绍了一种基于共消化和涡旋的水力空化（HC）预处理方法，用于处理源自乳制品加工废水的棕色污泥和溶解空气浮选（DAF）污泥，以提高生物甲烷潜力（BMP）。针对棕色污泥与DAF污泥的不同比例（1:1, 2%；3:1, 4%）进行了共消化实验。在39°C下，使用一个具有400 mL反应体积和顶置搅拌器的15反应器系统进行BMP测试，结果表明，经过80次通过HC装置后，HC处理使棕色污泥和DAF污泥的可溶性化学需氧量（sCOD）提高了34%以上。将DAF与棕色污泥相结合提高了甲烷产量，并缩短了达到BMP峰值的时间。以1:1的比例加载2%的挥发性固体（VS），甲烷产量超过了理论BMP的90%，超过了单独的棕色污泥和DAF污泥的BMP（分别为73%和84%）。最大VS去除率超过85%，实现了超过717 mL/g-VS的峰值甲烷产量。这些发现为应对废水处理挑战提供了见解，并突出了共消化在提高废物价值化方面的潜力。
