Amo-Duodu Gloria, Tetteh Emmanuel Kweinor, Rathilal Sudesh, Armah Edward Kwaku, Adedeji Jeremiah, Chollom Martha Noro, Chetty Maggie
Green Engineering and Sustainability Research Group, Department of Chemical Engineering, Faculty of Engineering and The Built Environment, Durban University of Technology, Durban 4001, South Africa.
Polymers (Basel). 2021 Dec 10;13(24):4323. doi: 10.3390/polym13244323.
In this study, the principle of sustaining circular economy is presented as a way of recovering valuable resources from wastewater and utilizing its energy potential via anaerobic digestion (AD) of municipality wastewater. Biostimulation of the AD process was investigated to improve its treatability efficiency, biogas production, and kinetic stability. Addressing this together with agricultural waste such as eggshells (CE), banana peel (PB), and calcined banana peels (BI) were employed and compared to magnetite (FeO) as biostimulation additives via 1 L biochemical methane potential tests. With a working volume of 0.8 L (charge with inoculum to substrate ratio of 3:5 /) and 1.5 g of the additives, each bioreactor was operated at a mesophilic temperature of 40 °C for 30 days while being compared to a control bioreactor. Scanning electron microscopy and energy dispersive X-ray (SEM/EDX) analysis was used to reveal the absorbent's morphology at high magnification of 10 kx and surface pore size of 20.8 µm. The results showed over 70% biodegradation efficiency in removing the organic contaminants (chemical oxygen demand, color, and turbidity) as well as enhancing the biogas production. Among the setups, the bioreactor with FeO additives was found to be the most efficient, with an average daily biogas production of 40 mL/day and a cumulative yield of 1117 mL/day. The kinetic dynamics were evaluated with the cumulative biogas produced by each bioreactor via the first order modified Gompertz and Chen and Hashimoto kinetic models. The modified Gompertz model was found to be the most reliable, with good predictability.
在本研究中，提出了维持循环经济的原则，作为从废水中回收宝贵资源并通过城市污水厌氧消化（AD）利用其能源潜力的一种方式。研究了AD过程的生物刺激，以提高其处理效率、沼气产量和动力学稳定性。通过1升生化甲烷潜力测试，将蛋壳（CE）、香蕉皮（PB）和煅烧香蕉皮（BI）等农业废弃物与磁铁矿（FeO）一起用作生物刺激添加剂，并进行比较。每个生物反应器的工作体积为0.8升（接种物与底物比例为3:5 /），添加1.5克添加剂，在40℃的中温下运行30天，同时与对照生物反应器进行比较。使用扫描电子显微镜和能量色散X射线（SEM/EDX）分析，在10 kx的高放大倍数和20.8 µm的表面孔径下揭示吸附剂的形态。结果表明，在去除有机污染物（化学需氧量、颜色和浊度）以及提高沼气产量方面，生物降解效率超过70%。在这些设置中，添加FeO添加剂的生物反应器被发现是最有效的，平均每日沼气产量为40 mL/天，累积产量为1117 mL/天。通过一阶修正Gompertz模型以及Chen和Hashimoto动力学模型，利用每个生物反应器产生的累积沼气来评估动力学动态。发现修正的Gompertz模型最可靠，具有良好的可预测性。
