Department of Chemical and Materials Engineering, The University of Auckland, Auckland, 1010, New Zealand; Department of Environmental Engineering, The Institute of Biotechnology and Environment, Nha Trang University, Viet Nam.
Department of Chemical and Materials Engineering, The University of Auckland, Auckland, 1010, New Zealand; Circular Innovations (CIRCUIT) Research Centre, The University of Auckland, Auckland, 1010, New Zealand.
Chemosphere. 2024 Jan;348:140676. doi: 10.1016/j.chemosphere.2023.140676. Epub 2023 Nov 11.
Due to its environmental impact, the growing production of sewage sludge is a prime concern for wastewater treatment plants. In this study, advanced thermal hydrolysis, the combination of thermal hydrolysis and oxygen, was examined to enhance biogas production and overcome the disadvantages of thermal hydrolysis, including sludge colour, high energy consumption, and high level of ammonia concentration in the treated sludge. A mixture of 55 % primary sludge and 45 % waste activated sludge was pre-treated using advanced thermal hydrolysis at 100, 115, 130, and 145 °C with a processing time varied from 5 to 30 min and oxygen pressure from 10 to 30 bar before anaerobic digestion. Advanced thermal hydrolysis process at 145 °C 15 min 20 bar O₂ is the condition that provided the highest biogas yield (439.6 mL/g VS added). At this treatment condition, the concentration of ammonia nitrogen and propionic acid in the treated sludge was sufficiently low (approximately 302 mg/L and 559.7 mg/L, respectively) to minimise adverse effects on anaerobic digestion.
由于其对环境的影响，污水污泥产量的不断增加是污水处理厂关注的首要问题。在本研究中，考察了高级热解，即热解与氧气的结合，以提高沼气产量并克服热解的缺点，包括污泥颜色、高能耗和处理后污泥中高浓度氨。将 55%的初沉污泥和 45%的废活性污泥混合物在 100、115、130 和 145°C 的温度下使用高级热解预处理，处理时间为 5 至 30 分钟，氧气压力为 10 至 30 巴，然后进行厌氧消化。在 145°C 15 分钟 20 巴 O₂的高级热解条件下提供了最高的沼气产量（439.6 毫升/克 VS 添加）。在这种处理条件下，处理后污泥中的氨氮和丙酸浓度足够低（分别约为 302 毫克/升和 559.7 毫克/升），可最大程度地减少对厌氧消化的不利影响。
