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Preliminary Feasibility of the Treatment of Household Brown Water with Food Waste for Biogas Production

Abdulmoseen Segun Giwa

The house hold waste stream generation and treatment techniques are still limited. Waste source separation including separate treatment of graywater, brown water and black water are necessary for a sustainable integrated water management application. In this study, each of the waste, notably brown water and food waste biochemical methane potential mix ratio (1:1; 4:1) were investigated to ascertain their energy value. Without the dilution of the household kitchen wastes (100 %), the average biochemical methane potential was 484 mL CH4/gVS, when the household kitchen waste dilution rate was 50 %, the methane value was 983 mL CH4/gVS. Although household kitchen wastes can be easily biodegraded, their biochemical methane potential decreased if it was highly diluted (50 %).These variations may be attributed to the increased ratio of the inoculum to the substrate, which increased the concentration for microbial dynamics and provided adequate nutrients for microbial growth。For different ratio between household kitchen waste and brown water, the biochemical methane potential had Fa great difference. When the KW: BW=1:1, the average BMP was 186.6mLCH4/gVS-add and KW:BW=4:1, the number was 112.2 mLCH4/gVS-add. These findings could offer the potential as a source of renewable energy generated through processing the brown water and food waste.