Abstract
This study presents magnetized nanoparticles (NPs) as a catalyst to accelerate anaerobic digestion (AD) potential for clean and ecofriendly energy (biogas) from wastewater settings. The effects of iron oxides (Ms) and aluminum sulphate (Alum) were investigated using two chronological experiments: (i) the Jar test technique to generate residue slurry as organic fertilizer potential and (ii) a magnetized biochemical methane potential (MBMP) system for biogas production at mesophilic conditions for 21 days. X-ray diffraction and Fourier Transform Infrared spectroscopy were carried out to establish the Ms Crystallite and active functional groups respectively. Scanning electronic microscopy coupled with energy dispersive X-ray spectrometer and elemental analysis were used to track and confirm NPs inclusion after the post-AD process. Coagulation at 50 mg/L and magnetic exposure time of 30 min showed above 85% treatability performance by Ms as compared to 70% for Alum. Owing to the slow kinetics of the AD process, additional NPs content in the digesters coupled with an external magnetic field improved their performance. Cumulative biogas yields of 1460 mL/d > 610 mL/d > 505 mL/d for Ms > Control > Alum respectively representing 80% > 61% > 52% of CH4 were attained. The modified Gompertz model shows that the presence of NPs shortens the lag phase of the control system with kinetics rate constants of 0.285 1/d (control) to 0.127 1/d (Ms) < 0.195 1/d (Alum).
Highlights
With the global concern about freshwater resources depletion, the purification of water and wastewater comes in handy to meet the necessities of humankind and other living organisms
This study investigated coagulation and anaerobic digestion of wastewater as a means to
This study investigated coagulation and anaerobic digestion of wastewater a means to facilitate facilitate integration of physiochemical and biological treatment processes as with benefits of biogas integration of physiochemical and biological treatment processes with benefits of biogas production production and reduction of landfills complexity
Summary
With the global concern about freshwater resources depletion, the purification of water and wastewater comes in handy to meet the necessities of humankind and other living organisms. This has sparked significant interest in developing wastewater treatment technologies worldwide, owing to the rapid industrialization and environmental pollution accompanying it [1,2,3,4]. Recovery of valuable products such as energy from wastewater and landfills is gaining much attention through worldwide application of the anaerobic digestion (AD) process [3,4,8]. In spite of managing zero-waste, recovering valuable potentials from wastewater as a renewable energy source (biogas) has attracted considerable attention, aimed at achieving green
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