| 摘要 |
PURPOSE: Provided is a method for extracting humic acid from livestock manure by using nature-friendly material such as chitosan as a coagulant, which can reduce cost for treating livestock manure by recycling the nonbiodegradable material, the humic acid, in agriculture. CONSTITUTION: The method comprises the steps of (a) biologically treating livestock manure, and filtering decant water or wastewater generated from the biological treatment by reverse osmosis, thereby obtaining concentrated wastewater, (b) feeding chitosan to the concentrated wastewater and mixing the chitosan and wastewater, thereby generating humic acid-chitosan slurry, wherein the chitosan is 0.7 to 1.0 %(w/v), (c) settling the humic acid-chitosan slurry by gravity, thereby separating the slurry into decant water and the sediment, (d) drying the sediment, and (e) crushing the sediment.
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