Banu J Rajesh, Kavitha S, Ravi Yukesh Kannah, Tyagi Vinay Kumar, Kumar Gopalakrishnan
Department of Biotechnology, Central University of Tamil Nadu, Neelakudi, Thiruvarur, Tamil Nadu 610005, India.
Environ Core Research Laboratory, Tamil Nadu, India.
Bioresour Technol. 2023 May;376:128857. doi: 10.1016/j.biortech.2023.128857. Epub 2023 Mar 10.
This study aimed to pretreat the waste activated sludge (WAS) by ultrasonication in an energy efficient way by combining sodium citrate with ultrasonic pretreatment at 0.03 g/g suspended solids (SS) of dosage. The ultrasonic pretreatment was done at various (20-200 W) power levels, sludge concentration (7 to 30 g/L), sodium citrate dosages (0.01 to 0.2 g/g SS). An elevated COD solubilization of 26.07 ± 0.6 % was achieved by combined pretreatment at a treatment time of 10 min, ultrasonic power level of 160 W when compared to individual ultrasonic pretreatment (18.6 ± 0.5 %). A higher biomethane yield of 0.26 ± 0.009 L/g COD was achieved in sodium citrate combined ultrasonic pretreatment (SCUP) than ultrasonic pretreatment (UP) 0.145 ± 0.006 L/g COD. Almost 50% of the energy can be saved through SCUP when compared to UP. Future study evaluating SCUP in continuous mode anaerobic digestion is vital.
本研究旨在通过将柠檬酸钠与超声预处理相结合，以0.03 g/g悬浮固体（SS）的剂量，以节能的方式对剩余活性污泥（WAS）进行预处理。超声预处理在不同的功率水平（20 - 200 W）、污泥浓度（7至30 g/L）、柠檬酸钠剂量（0.01至0.2 g/g SS）下进行。与单独的超声预处理（18.6±0.5%）相比，在10分钟的处理时间、160 W的超声功率水平下，联合预处理实现了26.07±0.6%的化学需氧量（COD）增溶。柠檬酸钠联合超声预处理（SCUP）的生物甲烷产量为0.26±0.009 L/g COD，高于超声预处理（UP）的0.145±0.006 L/g COD。与UP相比，通过SCUP可节省近50%的能量。未来评估连续模式厌氧消化中SCUP的研究至关重要。
