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A method of producing granulated whole organic fertilizer by mixing sewage digested and dewatered sludge with some organic substances mainly from rural organic wastes, granulating and microwave processing.
A method of producing granulated whole organic fertilizer by mixing sewage digested and dewatered sludge with some organic substances mainly from rural organic wastes, granulating and microwave processing.
PROBLEM TO BE SOLVED: To obtain granular whole organic fertilizer useful as a basal dressing of paddy by mixing digested and dehydrated sladge with organic waste, etc., of farm and mountain village in a specific ratio and granulating the mixture and treating the granules with microwave. SOLUTION: This method for producing granular whole organic fertilizer comprises the following five steps. (1) Water content of digested and dehydrated sludge 1 having about 76% water content using a polymer coagulating agent is reduced to about 60% by a kiln type drier 2. (2) The digested and dehydrated sludge is crushed by a crusher 3 and the sludge is mixed with chaff ash of organic waste of farm and mountain village and other organic matters, e.g. soybean oil cake, bone powder 91 to 96 , etc., by a mixer 4. Thereby, total content of nitrogen, phosphoric acid and potassium oxide which are three components of fertilizer is controlled to =8% and water content of the sludge is reduced from about 60% to about 45%. (3) The mixture is granulated to globe having =5 mm maximum diameter while jetting a granulating solution 11 by a rolling type granulating machine 101 . In this time, an aromatic agent is added thereto. (4) The granulates are treated with microwave so as to give evaporation heat by far-infrared ray or hot air. The water content of the granules is controlled to about 40% by microwave. (5) The granules are weighed by a weigher 16 and packed into a bag by a bagger 17.
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