Effect of recycling digestate filtrate for cow dung dilution on biogas production

TIZE KODA Joël 1, *, INOUSS MAMATE Abakaka 2, WAMBISSOU Tchombi 1 and NGAKOU Albert 3

1 Department of Renewable Energies, National Advanced School of Engineering, University of Maroua, P.O Box: 46 Maroua, Cameroon.
2 Energy and Environment Technologies Department, National Committee for Development of Technologies (CNDT), Ministry of Scientific Research and Innovation (MINRESI), P.O Box: 1457 Yaoundé, Cameroon.
3 Department of Biological Sciences, Faculty of Sciences, University of Ngaoundéré, P.O Box 454 Ngaoundéré, Cameroon.
 
Research Article
International Journal of Science and Research Archive, 2022, 07(02), 238-244.
Article DOI: 10.30574/ijsra.2022.7.2.0263
Publication history: 
Received on 12 October 2022; revised on 22 November 2022; accepted on 24 November 2022
 
Abstract: 
Biogas production in the Sahelian zone faces the problem of water shortage. This is one of the biggest obstacles encountered by projects to substitute firewood by biogas in this areas. The study aims to improve the accessibility of households to biogas in water shortage conditions by recycling the filtrate of the digestate into a new dilution of the substrate for biogas production. Thus, the Cow Dung (CD) digestate from the biogas unit was filtered. Filter with sand and cotton and filter with sand, biochar, and cotton were made. The filtrate obtained was used to make five treatments with CD to feed mini biodigesters (1st generation) of 1 liter each. After a HRT of 30 days, the digestate from the 1st generation was again filtered and reused to dilute five treatment (2nd generation). The biogas production and pH of each treatment repeated three times were evaluated. The results show that the dilution of CD with the filtrate from the 1st generation significantly improves the production of biogas by 47% compared to that of dung diluted with ordinary water. In the 2nd generation, dilution with OW provided the highest production which is 7% more than that obtained from the filtrates without biochar. As the pH is concerned, it varies between 6 and 7.5 when filtrates are used. It was more acidic when OW has been used. It appears that, the same quantity of water can be used three times for substrate dilution. This leads to less water demand for biogas unit running
 
Keywords: 
Digestate; Filtrate; Biogas; Substrate; Water; Far North
 
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