ojs2 has produced an error Message: WARNING: fopen(/opt/newajt/cache/fc-pluginSettings-1-timedviewplugin.php): failed to open stream: Permission denied In file: /opt/newajt/lib/pkp/classes/cache/FileCache.inc.php At line: 85 Stacktrace: Server info: OS: Linux PHP Version: 5.5.9-1ubuntu4.25 Apache Version: Apache DB Driver: mysql DB server version: 5.5.60-0ubuntu0.14.04.1
ojs2 has produced an error Message: WARNING: chmod(): No such file or directory In file: /opt/newajt/lib/pkp/classes/cache/FileCache.inc.php At line: 88 Stacktrace: Server info: OS: Linux PHP Version: 5.5.9-1ubuntu4.25 Apache Version: Apache DB Driver: mysql DB server version: 5.5.60-0ubuntu0.14.04.1
Development of a Renewable Energy Database System for East Africa – Survey on Biogas Usage and Potency of Various Agricultural Bio-wastes in Kenya | Nzila | The African Journal of Technology

Development of a Renewable Energy Database System for East Africa – Survey on Biogas Usage and Potency of Various Agricultural Bio-wastes in Kenya

C. Nzila, R. Muasya, A. Muumbo, K. Kiriamiti, J. Githaiga, J. Dewulf

Abstract


Kenya  being  an  agricultural  based  economy  produces  vast  amounts  of  agricultural  bio-waste such  as  maize/corn  stalks,  rice  and  wheat  straws,  tea  and  coffee  waste, sugarcane, banana and barley residues, sisal and cotton  wastes  as  well  as other forest  residues. Most of these residues  are  regarded  as of no immediate  value  hence  they  are  wasted  in  the  farms  through burning or uncontrolled decay  thus leading to nutrient leakage and eutrophication  to  the surrounding  water  bodies  as  well  as  contributing to odour and green-house gas emission through release of volatile and un-burnt hydrocarbons. The main objective of the researchwas to identify and develop  biogas data variables in Kenya through a structured use of anaerobic digestion as a means of producing biogas from agricultural bio-waste including animal manure  and  crop residues. The short term target of the project was a phased  development of well-defined/structured data variables suitable for a multilayered  database system  on  biogas energy in Kenya, which could later form a basis for the development of a real time biogas information dissemination  platform  that  can  be  replicated  in other regions across Africa. Literature review was done by means of desk-study and field surveys were conducted to gather qualitative as well as quantitative data for analysis and in-putting onto a Geographic Information System (GIS) based data mapping. Direct interviews were based on a schedule that employed a combination  of  direct  site  visits,  emails  and  phone  calls.Laboratory-based physical/bio-chemical characterization of biogas feedstock was  also conducted. Discussions with diverse biogas stake holders elicited 100% support from respondents in addition to yielding an array of recommendations. The bio‐methane results further demonstrated the suitability of coffee pulp residue, cotton residue and maize stover as complementary biogas feedstock.The biogas quality in terms of hydrogen supplied (H2S) and methane (CH4) content was quite promising. The biogas H2S content (ppmv) for all the substrates ranged from as low as 105 (for maize stover) to 1100 (sugarcane leaves) whereas  the CH4 content varied from 40% (sugar cane leaves) to 62%(cotton residue).Generally CH4 content is required to be above 50% whereas the presence of contaminants such as H2S is supposed to be less than 1000ppmv. From the results, biogas from coffee pulp residue, sugarcane bagasse, maize stover, cotton residue and banana stalks can be regarded as suitable alternatives for domestic biogas production.

Keywords


bio-waste; renewable energy; biogas characterization; biodigester; methane

Refbacks

  • There are currently no refbacks.

Comments on this article

View all comments
ojs2 has produced an error Message: WARNING: Invalid argument supplied for foreach() In file: /opt/newajt/classes/article/Article.inc.php At line: 142 Stacktrace: Server info: OS: Linux PHP Version: 5.5.9-1ubuntu4.25 Apache Version: Apache DB Driver: mysql DB server version: 5.5.60-0ubuntu0.14.04.1


For more information, contact: The Editor-in-Chief Email: yashon@mu.ac.ke School of Engineering, Moi University Kenya.

The African Journal of Technology
ISSN 1998 – 9350 (Print); ISSN 23135549 (Online)

Site maintained by: Directorate of ICT