Detection of Pathogenic Bacteria and Heavy Metal on Liquid Organic Fertilizer from Dairy Cattle Waste
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Indonesian Center for Animal Science Research and Development (ICARD)
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Dairy cattle waste has positive potential that can be explored to be useful product, the negative property of waste should be controlled to avoid environmental pollution. Dairy cattle waste can be processed into liquid organic fertilizer for crops. The aim of study was to determine the number of pathogenic bacteria (Escherichia coli and Salmonella sp.) as well as heavy metals (Pb, Cd, As, Hg) in liquid organic fertilizer from dairy cattle waste. Liquid organic fertilizer is obtained by extracting the decomposition substrate from dairy cattle waste and rice straw with water solvent. The study was conducted experimentally using a completely randomized design with three treatments namely ratio decomposers to waters and 6 replications. Data were analyzed by analysis of variance and Duncan test to determine the difference between treatments. The result showed that: (1) the content of both Escherichia coli and Salmonella sp. are <30 MPN/ml; (2) the highest level of heavy metals Pb, Cd, and As are 0,17 ppm, 0,1 ppm, and 0,3 ppm respectively, while Hg is not detected in all treatments. Either pathogenic bacteria or heavy metals accounted below recommendation limit in the minimum technical requirement by Permentan number 70/Permentan/SR/140/10/2011.
Keywords
Pathogenic Bacteria; Heavy Metals; Dairy Cattle Waste; Liquid Organic Fertilizer