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Kinetic study and performance evaluation of an integrated two-phase fixed-film baffled bioreactor for bioenergy recovery from wastewater and bio-wasted sludge
Renewable and Sustainable Energy Reviews ( IF 15.9 ) Pub Date : 2019-12-27 , DOI: 10.1016/j.rser.2019.109674
Ehsan Ahmadi , Samira Yousefzadeh , Adel Mokammel , Mohammad Miri , Mohsen Ansari , Hossein Arfaeinia , Mojtaba Yegane Badi , Hamid Reza Ghaffari , Soheila Rezaei , Amir Hossein Mahvi

The present study evaluated the performance of an integrated two-phase fixed-film baffled bioreactor for wastewater treatment with regard to its energy consumption and production. The total potential of the bioenergy recovery of the bioreactor was evaluated not only from the anaerobic wastewater treatment but also from the produced bio-wasted sludge of both phases. Statistical correlations between bio-methane production and kinetic coefficients were uncovered. Methane yields between 0.15 and 0.30 L CH4.g sCODremoved−1 were obtained during anaerobic wastewater treatment. The maximum energy recoveries from the digestion of bio-wasted sludge (sloughed biofilm) equaled 0.28 and 0.3 L CH4. g TS−1 for aerobic and anaerobic units, respectively. The Grau model was appropriate for predicting the performance of the bioreactor and the potential of bio-methane production. It was demonstrated that substrate utilization rate (Rsu) and Grau coefficient (KG) can be applied to predict the rate of methane production. Regarding the volume of treated wastewater, the energy production was in the range of 2.8–12 kWh.m−3. Moreover, the overall energy consumption of wastewater treatment was in the range of 0.32–0.79 kWh/kg sCODremoved, while the total energy production was 3.7–5.1 kWh/kg sCODremoved. Therefore, the designed bioreactor was energy positive with net energy production of 3.39–4.5 kWh/kg sCODremoved−1. The total energy requirement for both wastewater treatment and bio-wasted sludge digestion was 7–15.5% of the total energy production, and, therefore, the bioreactor is a sustainable energy process. The contribution of anaerobic wastewater treatment and anaerobic digestion of bio-wasted sludge of aerobic and anaerobic units for energy recovery as bio-methane was 53, 26, and 21%, respectively. As the bioreactor achieved more than 95% of sCOD removal and have a high bioenergy production, and since kinetic coefficients demonstrated the considerably high performance of the bioreactor, it can be of interest as an appropriate treatment process.



中文翻译:

一体化两相固定膜折流式生物反应器用于废水和生物废渣中生物能回收的动力学研究和性能评估

本研究评估了集成式两相固定膜折流式生物反应器在能耗和生产方面的废水处理性能。不仅从厌氧废水处理中评估了生物反应器的生物能总回收潜力,而且还从两个阶段产生的生物浪费污泥中评估了生物反应器的生物能回收潜力。尚未发现生物甲烷产量与动力学系数之间的统计相关性。在厌氧废水处理过程中,甲烷的收率在0.15和0.30 L CH 4 .g sCOD之间,去除了-1。从消化的生物污泥(腐烂的生物膜)中回收的最大能量回收量等于0.28和0.3 L CH 4。g TS -1分别用于有氧和厌氧单位。Grau模型适用于预测生物反应器的性能和生物甲烷生产的潜力。结果表明,底物利用率(R su)和格劳系数(K G)可用于预测甲烷的产生速率。关于处理后的废水量,能量产生在2.8-12 kWh.m -3的范围内。此外,废水处理的总能量消耗是0.32-0.79千瓦时/公斤SCOD的范围去除,而总能源生产量为3.7-5.1千瓦时/公斤SCOD除去。因此,设计的生物反应器是正能量的,净发电量为3.39–4.5 kWh / kg sCOD移除-1。废水处理和生物废渣消化的总能量需求占总能量生产的7-15.5%,因此,生物反应器是可持续的能源过程。厌氧废水处理和好氧和厌氧生物污泥厌氧消化对作为生物甲烷的能量回收的贡献分别为53%,26%和21%。由于生物反应器实现了超过95%的sCOD去除率,并具有较高的生物能产量,并且由于动力学系数证明该生物反应器具有相当高的性能,因此作为一种合适的处理方法可能引起人们的兴趣。

更新日期:2019-12-27
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