Al-Mrayat Tuqa, Al-Hamaiedeh Husam, El-Hasan Tayel, Aljbour Salah H, Al-Ghazawi Ziad, Mohawesh Osama
Civil and Environmental Engineering Department, Faculty of Engineering, Mutah University, Karak, 61710, Jordan.
Department of Chemistry, Faculty of Science, Mutah University, Karak, 61710, Jordan.
Heliyon. 2022 May 17;8(5):e09418. doi: 10.1016/j.heliyon.2022.e09418. eCollection 2022 May.
This study aims to investigate a sustainable method for sewage sludge (SS) safe disposal and reuse. The study involved exploring the optimum parameters of thermal treatment of SS by pyrolysis to produce biochar. Based on the analysis of the full factorial design, the effects of pyrolysis conditions: temperature, heating rate, and isothermal time on pyrolysis product yields were evaluated. The average yield of biochar was significantly reduced when the pyrolysis temperature was increased from 300 to 500 °C, while the average yields of bio-oil (BO) and non-condensable gases (NCGs) were increased. The yield of biochar was nearly the same when the heating rate was increased from 5 to 35 °C/min, while the yield of BO was increased and the yield of NCGs was decreased. The average yields of biochar and NCGs were reduced when the isothermal time was increased from 45 to 120 min, while the yield of BO was slightly increased. Factorial design methodology revealed all potential interactions between the variables of the pyrolysis process of SS. To predict pyrolysis product yields, first-order regression models were developed based on the effects' magnitude of the process parameters and their interactions. The models were agreed to the experimental data.
本研究旨在探究一种污水污泥安全处置与再利用的可持续方法。该研究涉及探索通过热解处理污水污泥以生产生物炭的最佳参数。基于全因子设计分析，评估了热解条件（温度、升温速率和等温时间）对热解产物产率的影响。当热解温度从300℃提高到500℃时，生物炭的平均产率显著降低，而生物油（BO）和不可凝气体（NCGs）的平均产率增加。当升温速率从5℃/min提高到35℃/min时，生物炭的产率几乎相同，而生物油的产率增加，不可凝气体的产率降低。当等温时间从45分钟增加到120分钟时，生物炭和不可凝气体的平均产率降低，而生物油的产率略有增加。因子设计方法揭示了污水污泥热解过程变量之间的所有潜在相互作用。为了预测热解产物产率，基于工艺参数及其相互作用的影响程度建立了一阶回归模型。这些模型与实验数据相符。
