Design of Three Stages Continuous Anaerobic Digestion (AD) Plant
Journal Title: American journal of Engineering Research - Year 2017, Vol 6, Issue 11
Abstract
The AD system is extensively acceptable as an efficient process for treatment and utilization of organic waste because it has proven to be promising method for waste recycling and energy generation. However, the major problems face with existing AD plants are long hydraulic retention time and low biogas yield. Redesigning of AD plant for performance can lead to improve biogas yield at shorter hydraulic retention time. This paper is focused on the design of three stagescontinuousanaerobic digestion (AD) plant. Key analysis and concern about the design considerations, design requirement, material selection, optimum operating condition of biogas production were carried out. The major components of the plant are; stirrer shaft, bearings, reactor vessels, valves, pH meter, pressure gauge, thermometer, etc. To ensure that an efficient plant is designed for performance, the following parameters were design for; volume of reactor vessel, stress induced by total internal pressure, slurry and gas pressure, torque, drag force, stirrer shaft diameter, bearing selection, power, etc. The plant was test for performance using 35kg of non-uniform multiple feedstock mainly obtained from food waste, water hyacinth, waste water, pig and cow dung and the following process and operation parameters (volatile solid, temperature, hydraulic retention time, pressure, total solid, pH, organic loading rate) of AD system were monitored. The results obtained show that hoop stress act on the reactor vessel that is cylindrical in shape. Besides, torque of 20.2958Nm (AD1/AD2) and 24.0543Nm (AD3), stirrer shaft diameter of 20mm, maximum shear stress of 110Mpa, yield stress of 220Mpa, total internal pressure of 2.2MPa, slurry pressure of 6662.25MPa, maximum gas pressure of 2.193MPa, drag force of 33.8263N (AD1/AD2) and 60.1357N (AD3) were obtained. The performance test results with non-uniform multiple feedstock confirm reduction in hydraulic retention time (25day), improve biogas yield, stable pH values, improved organic loading rate, percentage volatile solid of 95% and percentage total solid of 10.00%.
Authors and Affiliations
P. O. Osunde1 ,, E. K. Orhorhoro2 ,, P. O. B. Ebunilo
Keywords
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