VIEWS: 29 PAGES: 24 CATEGORY: Biotechnology POSTED ON: 12/1/2012
various presentations on use of human excreta for biogas production and co-composting
COMPOSTING AS A TOOL TO MANAGE AQUATIC WEEDS IN THE LOWER VOLTA BASIN IN GHANA DR. TED YEMOH ANNANG INSTITUTE FOR ENVIRONMENT AND SANITATION STUDIES, UNIVERSITY OF GHANA, LEGON. THE AQUATIC VEGETATION SITUATION IN THE LOWER VOLTA BASIN IS DUE TO FLOW REGIME CHANGE RESULTING FROM DAMMING. Out of the management / control options available ,manual / mechanical removal was most suitable and therefore adopted. HARVESTING AQUATIC PLANTS TO ALLOW FOR OTHER USES OF THE AQUATIC RESOURCE Community participation in reducing vegetation level to allow for other uses of the water like fishing, boat landing and even access to potable water. Harvesting aquatic weeds Community members engaged in harvesting plants that have assumed nuisance levels. VALUE ADDITION TO HARVESTED PLANTS TO BENEFITS THE COMMUNITY. COMPOSTING TO THE RESCUE The harvested plants are being prepared for composting. INPUTS • Brown: Dried Harvested plants (2 weeks) • Green : Freshly Harvested plants • Manure: Chicken droppings/cow dung • Wood ash (Obtained from the community) Preparation 2 methods are employed: Pile and the Windrows • The order of pile formation is as follows: • a. Brown as base • b. Green layer • c. Manure • d. Wood ash • e. water For every layer in the pile, B: G ratio is 2:1 A pile is 4 – 5 layers ( 1.5 m high). A pile is then covered with a polythene sheet perforated at various points to conserve moisture, retain heat and aerate. A stick is used as Temperature probe. Preparation • The windrows type is also employed at time depending on availability of labour. • Turning is done after every 21 days 3 times. • Generally decomposition is completed by the 63rd but allows 21 days for curing/maturation. This is indicated by a lower temperature. Product is then spread to cool and ready for use. • It is ensured that at any point in time the pile is moist. If not water is added during every turning session Composting in progress In this process other “waste” materials like chicken droppings or other animal faecal matter, wood ash and or saw dust serving as sources of nutrients are added to enhance quality. Harvested plants undergoing decomposition Adding water to partially decomposed plant material There is an added advantage here as harvested plants contained lots of water. Compost set up covered to complete the process. Community members engaged in a discussion with a resource person on the benefits of the process to their livelihood. Compost preparation Turning compost heap after some time (21 days) to enhance the decomposition process. Plant material covered to enhance complete decomposition Plants of various types put together to bring different properties including bulkiness to the finished product. Compost from harvested aquatic plants ready for use. Compost is ready to be used either in backyard /home gardens or farms in the community or otherwise. Compost is ready. Compost bagged ready to be used Compost from Harvested Aquatic plants for the Market Bags of compost from aquatic plants ready for application to enhance soil quality and improve livelihood. Compost from harvested aquatic plants in storage THANK YOU!
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