02397cas a2200241 a 450000500170000000800410001703500150005810000370007324500330011026000520014330000100019549000270020550001550023250200580038752013960044565000190184170000340186070000440189470000440193871000490198281000590203185600650209020260818084431.0110910s1983    th uu|m rtt   0|  a1eng d  a.b101541521 aPadilla, Bienvenido Huerto,cJr.10aComposting of water hyacinth  aBangkok :bAsian Institute of Technology,c1983  a78 p.1 aThesis ;vno. AE-83-23  aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Environment, Resources and Development  aThesis (M.Eng.) - Asian Institute of Technology, 1983  aIn the light of providing cheap and readily available  nutrition for fish food production, a study on aerobic composting  of water hyacinth on a pilot scale was undertake n. In this work, 20 pilot-size piles of chopped water hyacinth under treatments of varying pile size and moisture levels were composted over periods  ranging from 5 to 2 0 weeks. During these periods analyses were conducted on a weekly basis to evaluate the physical and bio-chemicals changes occurring in these piles as degradation proceeded. Three experiments were conducted : (1) piles comparing 1.4, 1.0 and 0.6m heights; (2) piles comparing low range moisture levels of 55%, 65% and 75%; and (3 ) piles comparing high range moisture levels of 75% , 85% and 93% (fresh) . included in the last  experiment was a pile mixture of rice straw and water hyacinth at  a moisture content of a bout 75% , to ascertain the possibility of eliminating the drying procedure . All treatments were set up in duplicate. At the outset, 1.4 m initial pile height and 70% moisture were  considered optimum levels for efficient composting. Five weeks  was taken as an adequate composting time to ensure high nitrogen an d phosphorus conservation and a bout 75% decomposition of degradable organics . However, results of a water hyacinth-rice straw mixture , though acceptable , need to be compared with other  moisture level treatments. 0aWater-hyacinth1 aEdwards, Peter, eChairperson1 aKim, Kong-Hwan, eExamination Committee1 aWee, Kok Leong, eExamination Committee2 aGovernment of Australia, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. AE-83-23  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B20940