Assessment of biofertilizer quality and health implications of anaerobic digestion effluent of cow dung and chicken droppings

Alfa, M. I. and Adie, D. B. and Igboro, S. B. and Oranusi, S. U. and Dahunsi, S. O. and Akali, D. M. (2013) Assessment of biofertilizer quality and health implications of anaerobic digestion effluent of cow dung and chicken droppings. Renewable Energy. pp. 681-686. ISSN 0960-1481/$

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Anaerobic digestate have been identified as a rich source of essential plant nutrients. Nevertheless, itssafety measured by the concentration of pathogen present is of great concern to end users. This researchexplored the efficiency of the mesophilic biodigestion process in the stabilization and sanitization of cowdung and chicken droppings. Six (6) kg each of cow dung and chicken droppings were collected fresh andfree from impurities, pre-fermented, mixed with water in the ratio 1:1 w/v to form slurry, fed into therespective reactors and digested for 30 days at an average ambient temperature of 30�2�C. The pH ofthe mediumfluctuated between 6.5 and 8.0. The analysis of the feedstock and effluent of the digestersshowed that a total solids reduction of 75.3% and 60.1% were recorded for cow dung and chickendroppings while the reduction in total coliforms was 95% and 70% respectively for the dung and drop-pings. Microbial analysis of the biofertilizer produced reveals both aerobic and anaerobic organismswhich include species ofPseudomonas,Klebsiella,Clostridium,Bacillus,Bacteroides,Salmonella,PenicillumandAspergillus. Escherichia coliandShigellaspp. were removed while species ofSalmonellaandKlebsiellawere still present in the digestate. Notwithstanding these results, the digestate still requires furthertreatment for it to be suitable for application on unrestricted crops either as fertilizer; otherwise a healthproblem would be created as attempt is made to improve soil fertility

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment
Date Deposited: 18 Feb 2019 09:01
Last Modified: 18 Feb 2019 09:01

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