Improvement of Biogas Production Efficiency from Dairy Manure by Air-lift System Using Simple Simulation Program and Reactor Operation Approaches
2023
Thanomsieng, Pornpawee | Pholchan, Patiroop
Anaerobic process has been perceived as a sustainable method for treating and producing biogas from dairy farm. However, some operational problems have regularly been reported. This study was conducted in order to determine the suitable mixing scheme for the modified covered lagoon using air-lift systems to enhance the system efficiency and prevent the pipe clogging problem. Suitable biogas flowrate and installing position for the air-lift system were determined via the flow scheme simulation using ANSYS Student 2019 program. Both biogas flowrates and installation positions were found to significantly affect the mixing regimes and reactor performances. At the suitable biogas flowrate of 20 L/min, reactor contents were properly mixed both in the front and the reaction parts of the reactor. Results from the actual reactor operation using three 8 m3-modified covered lagoons operated at the organic loading rate of 2.0 kg VS/m3-d showed that anaerobic pond installed with the air-lift system in the front part provided better system stability, waste treatment and biogas production efficiencies compared to those obtained from the one with the air-lift system both in the front and the end parts and the control one without any mixing system.
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