Optimization of Biogas Production by Co-Digestion of Organic Waste (Cow Dung and Water Hyacinth)

Alfred Dèdonougbo Dohou,Gabin Koto N’Gobi,Clément Adéyémi Kouchade,Basile Kounouhewa

doi:10.52825/thwildauensp.v1i.12

Alfred Dèdonougbo Dohou, Gabin Koto N’Gobi + Show 2 more

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https://doi.org/10.52825/thwildauensp.v1i.12

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Abstract

The objective of this work is to determine the co-digestion ratio of water hyacinth and cow dung for the optimization of biogas production at Sô Ava, a lake city of Southern Benin. To achieve these ratios, we suppose that the water hyacinth has a high gas yield and cow dung ensures stability in the biodigester because it brings fresh bacteria and has a strong buffering capacity (maintenance of a stable pH). For 45 days, we have introduced a mixture of water hyacinth and cow dung in 5 mini-biodigesters of 10 liters each: digester no1 (100% of cow dung); digester no2 (100% of the water hyacinth); digester n° 3 (50% of the water hyacinth and 50% of the cow dung); digester no4 (75% of cow dung and 25% of water hyacinth); digester no5 (75% of the water hyacinth and 25% of the cow dung). The measurements of the pH, temperature and the proportion of gas (CH4, CO2, O2 and H2S) in the mini-biodigesters was done. The measurements show that the digester n° 5 produces the highest capacity of 15.24L of biogas with 70% of methane while the digester n °2 has the lowest capacity 5.47L of biogas with 58% methane. These results show that the yield of biogas produced is greater when using the mixture of the substrate with the ratio of 75% of water hyacinth and 25% of cow dung. This result encourages the energy recovery from water hyacinth, once considered as a seasonal plague which hinders navigation of local boat in the lake.

Highlights

Anaerobic digestion is the biochemical process of producing biogas by transforming complex organic materials into a clean, renewable source of energy
Astals et al [5] studied the co-digestion of livestock manure with other different biomasses to improve biogas production rates [6] reported that the combination of whey and poultry manure was found to be able to
The results showed that anaerobic digestion is the solution to the handling of organic waste and above all it is very beneficial with little negative impact on the environment

Summary

Introduction

Anaerobic digestion is the biochemical process of producing biogas by transforming complex organic materials into a clean, renewable source of energy. The use of co-substrates generally improves biogas yields due to the positive synergies established during the digestion process and the supply of missing nutrients by the co-substrates [1]. Several studies have been carried out on the production of biogas using different biomasses as mono-substrates [2],[3]. Anaerobic co-digestion has been widely used to improve biogas production. Astals et al [5] studied the co-digestion of livestock manure with other different biomasses to improve biogas production rates [6] reported that the combination of whey and poultry manure was found to be able to

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