Karaca C, Sözen S, Orhon D, Okutan H
ENVIS Energy and Environmental Systems R&D Ltd, ITU Arı Teknokent, Arı-1 Building No. 16, 34469 Maslak, Istanbul, Turkey.
ENVIS Energy and Environmental Systems R&D Ltd, ITU Arı Teknokent, Arı-1 Building No. 16, 34469 Maslak, Istanbul, Turkey; Faculty of Civil Engineering, Environmental Engineering Department, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey.
Waste Manag. 2018 Aug;78:217-226. doi: 10.1016/j.wasman.2018.05.034. Epub 2018 Jun 7.
This study explored the potential of high temperature pyrolysis for energy recovery from domestic sewage. It mainly defines optimum operating conditions to maximize syngas generation. A pyrolysis unit was operated in batch mode, at temperatures of 450, 600 and 850 °C, rotation speeds of 10, 40 and 60 Hz. The sludge had 6% moisture content; it contained 65% organic matter and involved a low calorific value of 13.535 kJ/kg dry matter. Pyrolysis at 850 °C and high rotation speed of 60 Hz yielded the highest conversion of sludge to syngas, with an average of 59% of the organic matter as syngas, 29% as tar and 12% as biochar. Pyrolysis enabled 74% of the energy recovery as syngas and tar. Continuous full-scale pyrolysis systems would further increase the syngas by recovering condensable gaseous products and/or recycling tar back into the pyrolysis unit. A unified approach for energy recovery management should equally consider what fraction of the energy contained in the wastewater was consumed and wasted before generating the sludge. Therefore, the adopted management scheme should also cover all design and operation parameters of the treatment plant, because this is how the energy is best conserved even before the sludge is generated.
本研究探索了高温热解从生活污水中回收能源的潜力。主要确定了使合成气产量最大化的最佳操作条件。热解装置以间歇模式运行，温度为450、600和850℃，转速为10、40和60Hz。污泥含水量为6%；含有65%的有机物，干物质的低热值为13.535kJ/kg。在850℃和60Hz的高转速下进行热解，污泥转化为合成气的转化率最高，平均59%的有机物转化为合成气，29%转化为焦油，12%转化为生物炭。热解实现了74%的能源以合成气和焦油的形式回收。连续全尺寸热解系统通过回收可冷凝气态产物和/或将焦油循环回热解装置，将进一步提高合成气产量。能源回收管理的统一方法应同样考虑在产生污泥之前，废水中所含能量有多少被消耗和浪费。因此，所采用的管理方案还应涵盖处理厂的所有设计和运行参数，因为即使在产生污泥之前，这也是最佳的节能方式。
