Performance Augmentation of Household Batch Digester using a Circular Horizontal Extended Surface

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Ammar H. Soheel
Johain J. Faraj
Fawziea M. Hussein

Abstract

The digester geometry significantly enhances household batch digesters' performance, especially the internal surface area. The present study investigates the impact of different extended surface areas augmented around inside digesters on anaerobic digestion performance. Four batch digesters were used, i.e., A, B, C, and D, with no extended surfaces, with four horizontal circular extended surfaces of width 2, 4, and 6 cm, respectively. Cow dung was used as a substrate in those digesters under mesophilic conditions. Experimental results show that the highest peak of methane contents were 70.78, 72.61, 73.82, and 74.22 %. High daily biogas production volumes were 18.4, 19.4, 19.5, and 20.8 L, and high accumulative biogas production volumes were 354.1, 425.3, 471.4, and 509 L for digesters A, B, C, and D, respectively. During the experiment start-up phase, pH values dropped to 6.5, 6.4, 6.2, and 6.1 for digesters A, B, C, and D, respectively. The four digesters' methane (CH4) content values increased in the first days of the anaerobic digestion (AD) process. Favored performance and better biogas production outlined with digester D had a high interior extended surface area. The future work, organic loading rate (OLR), and temperature at different reactors to demonstrate its potential use in industrial applications. Co-digestion of STW with multiple organic wastes originating from a significant quantity of biogas at a single point can be investigated further.

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