Manufacturing method of organic fertilizer using sludge of water supply and drainage

摘要

PURPOSE: A manufacturing method of an organic fertilizer using sludge of a water drainage is provided to prevent the environmental contamination by recylcling the water drainage sludge through low frequency-processing a mixture containing the sludge. CONSTITUTION: A manufacturing method of an organic fertilizer using sludge of a water drainage comprises the following steps: mixing 40~60wt% of the water drainage sludge, 20~40wt% of sawdust, 5~10wt% of lime powder, and 3~7wt% of rice bran; low frequency-processing the mixture; adding microorganisms and amino acid for removing heavy metals, and stirring and aging the mixture; and after-ripening the mixture. The low frequency-processing step is performed for 30 minutes~2 hours.