5.4
Waste Treatment
By: Chenshuo Li
For waste management, an anaerobic digester will be placed near the rear of the animal pens for blackwater, animal waste, and organic solid waste to turn into energy and fuel, and fertilizer (Tilley et al.2014). The biogas reactor can produce biogas that replaces conventional energy sources, reducing reliance on fossil fuel and firewood. And the biogas slurry produced by the reactor can substitute chemical fertilizer for the crop yield, where the human excreta cannot be directly used as fertilizer while reducing N2O emissions. Figure 51 Anaerobic Digestion Generators Schematic
Tilley et al. (2014).
Biogas is a combination of methane, carbon dioxide, and other trace gases, which could be transformed into light, heat, or electricity (MES et al. 2003). The Small-scale biogas reactor is usually designed to produce biogas at the household or community level in rural areas, which is suitable waste management for the Women House in Baghere. The biogas reactor only required a small land space and no electrical energy consumption for the entire mechanism. It combined waste treatment of animal, human and solid organic waste from the kitchen or the garden. Besides, the biogas reactor can be constructed with low capital cost and maintained with low operating costs with materials that can be found at local (Tilley et al. 2014).
