Department of Civil Engineering, Mu'tah University, Al-Karak, Jordan.
Department of Civil Engineering, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
Environ Sci Pollut Res Int. 2020 Apr;27(12):13227-13236. doi: 10.1007/s11356-020-07906-1. Epub 2020 Feb 3.
Co-digestion samples containing thickened waste activated sludge and fat, oil and grease were subjected to three different pretreatment methods, i.e., microwave at 175 °C, hyper-thermophilic stage at 70 °C, and conventional heat at 70 °C. The soluble matter extracted from the un-pretreated and pretreated samples were subjected to an ultrafiltration (UF) process using four different membrane sizes (300, 100, 10, and 1 kDa) for molecular weight distribution analysis. Every pretreatment method had a different effect on the solubilization and redistribution of the soluble matter (SCOD and TVFA). For example while MW pretreatment resulted in a significant increase in the SCOD at the lowest molecular weight (< 1 kDa) and at the highest molecular weight (> 300 kDa), Hyper pretreatment caused the majority of the SCOD ( ̴ 62.7% of total SCOD) to be concentrated at the smaller molecular weight range (< 10 kDa). The MW and hyper-thermophilic pretreatments were much more effective in increasing samples solubilization and biogas production compared to the conventional heat pretreatment. The hyper-thermophilic samples had the maximum improvement in cumulative biogas production from all the molecular weights compared to MW- and Heat-pretreated samples; Hyper-pretreated samples achieved 86.5% higher cumulative biogas production compared to the control.
含增稠剩余活性污泥和脂肪、油和油脂的共消化样品经过三种不同的预处理方法，即 175°C 的微波、70°C 的超高温和 70°C 的常规加热。未经预处理和预处理样品中提取的可溶性物质分别用四种不同的膜尺寸（300、100、10 和 1 kDa）进行超滤（UF）处理，以进行分子量分布分析。每种预处理方法对可溶性物质（SCOD 和 TVFA）的溶解和再分配都有不同的影响。例如，MW 预处理导致最低分子量（<1 kDa）和最高分子量（>300 kDa）的 SCOD 显著增加，而超预处理导致大部分 SCOD（总 SCOD 的 ̴62.7%）集中在较小的分子量范围内（<10 kDa）。与常规热预处理相比，MW 和超高温预处理在增加样品溶解和沼气产量方面更有效。与 MW-和热预处理样品相比，超高温预处理的样品在所有分子量的累积沼气产量方面都有最大的提高；与对照相比，超高温预处理的样品的累积沼气产量提高了 86.5%。
