JPH01208385A - Production of organic fertilizer by processed marine waste or the like - Google Patents

Abstract

PURPOSE:To change waste into a source and to obtain an organic fertilizer containing N, P, K, etc., by adsorbing scum, surplus sludge, etc., occurring in treating process of waste water of marine product processing plants on fowl droppings and powdered bones, blending, granulating, aerobically fermenting and further drying. CONSTITUTION:Various floating waste (scum) or precipitate (surplus sludge) occurring in a process of treating waste water discharged from marine product processing plants is made into, e. g., 60-70% water content and is used as a raw material. Given amounts of fowl droppings having, e.g., about 13% water and powdered bones having about 15% water are sent to a blending and grinding machine, adsorbed and blended with the raw material to give granules having about 40-50% water content. Then the granules are fed to a fermenting device such as a piling and fermenting device, heated to 60-80 deg.C while introducing warm air, further aerobically fermented for, e. g., 5-10 days and dried into <=about 30wt.% water content to give an organic fertilizer which has 5-7mm particle diameters, fertilizer components of 4-8% N, 5-15% P2O5 and 1-5% K and low smell.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention is directed to the use of fertilizer components such as nitrogen, phosphoric acid, and potassium in the floating residue or sediment of wastewater treated from marine product processing plants. To,
This paper focuses on a method for producing organic fertilizer that aims to turn waste into resources.

(Prior technology) Traditionally, fish bones and viscera generated during the processing of marine products are mainly used as feed for livestock, and some are used as fertilizer, but large amounts of this waste and water are generated during the water treatment process. Scum or sediment (excess sludge) contains approximately 60 to 85% water even after draining, and drying it requires too much fuel, and if left to accumulate, it will rot. Because it is easy to clean and immediately generates a strong odor, most of it was discarded in landfills because its utility value was not recognized.

(Problem that the invention seeks to solve).

Therefore, this invention has developed a method that contains fertilizer containing approximately 10% nitrogen, 5% to 8% phosphorus, and 1% potassium in the sediment from the float tower, which is generated in large quantities in the wastewater treated at the above-mentioned seafood processing plants. There is also a method that focuses on the fact that it contains the most amount of water, and attempts to use it as a fertilizer by turning it into a resource. For this reason, by mixing floating materials, scraps, and sediment with dried poultry manure and bone meal, we can adjust the moisture content and fertilizer components, as well as adsorb the oil content, creating a good aerobic fermentation state and fermenting. After treatment, it is dried to produce a product with an appropriate particle size.

(Means for Solving the Problems) [Example] An example of the present invention will be described in detail below according to a flowchart. First, scum or surplus sludge (referred to as raw material a) with a moisture content of about 60 to 70%, water content 13 % dry chicken manure and dry sludge (referred to as raw material) and additives such as bone meal (referred to as raw material C) with a moisture content of approximately 15% to quantitative feeders (referred to as raw material C).
Store in Fl) (F2) (F3). This feeder (F
) can be arbitrarily selected by a screw with a variable motor, so each raw material (a
), (t)), and (C) are calculated from the component ratios, and the respective blended amounts are fed dropwise from each feeder onto the mixed raw material conveyor (4) installed at the lower level, and are then fed to the next mixing and crushing machine (
Send to 5). In this mixing and crushing machine (5), each raw material is mixed for a certain period of time, pulverized to a diameter of 10 mm or less, and crushed to achieve a good aerobic fermentation state.Next, the raw materials are granulated. Mixed raw materials with a moisture content of around 40 to 50% are transferred to conveyor belts (Bl) (B2) (B3), (
B6) is used to sequentially deposit fermenters (Hl) (H2) (H3).
), , (H6).

The heaping fermentation tank (H) is equipped with a blower (
V), which blows warm air from below.

The air blowing time is controlled by timer operation to maintain the temperature raised by the aerobic fermentation state.

The particles are gently dropped from the belt conveyor (B) into the fermenter (H), and the temperature rises to 30 to 40°C about 6 hours after being introduced, and rises to around 50°C about 24 hours later. Thereafter, the temperature reaches 60°C or higher to maintain good aerobic fermentation conditions. As a result, the feathers and the like contained in the chicken manure disappear through fermentation, and the malodorous components of the scum or excess sludge are also decomposed, reducing the odor.

After further fermentation for 5 to 10 days under such aerobic fermentation conditions, the fermented particles with a moisture content of 30 to 35% are dried in a dryer (D) to a moisture content of 13% or less, resulting in a product that can withstand long-term storage. shall be. The dried product is sieved using a sieving device, and the particle diameter is 5-7 or less, the fertilizer content is 4-8% nitrogen,
A good organic fertilizer with high phosphoric acid content of 5 to 15% and processing of 1 to 5% and low odor is produced.

(Effects of the Invention) The organic fertilizer of the present invention produced as described above has been analyzed by the Japan Fertilizer Inspection Association as shown in the following table.

In addition, several vegetable cultivation tests commissioned by the above-mentioned association have shown that the fertilizer is equivalent to other organic fungal fertilizers containing calcium carbonate, and no hindrance to vegetation has been observed. has been done. As described above, this invention has been recognized to be effective as a fertilizer, and has the great effect of making it possible to recycle large amounts of scum or surplus sludge, which have not been considered as waste in the past, into resources.

[Brief explanation of the drawing]

FIG. 1 is a specific flow sheet showing the fertilizer manufacturing method of the present invention, and FIG. 2 is a flow chart showing an overview of the manufacturing process. Raw material a: Scum or surplus sludge raw material B: Dry chicken manure and dried sludge raw material C: Additives such as bone meal Fl, F2. F3...Quantitative feeder 4...Mixed raw material conveyor 5...Mixing crusher Bl, B2. , B6...belt con hair H1, H2,...
H6... Sediment fermentation tank D... Dryer ■... Air blower

Claims (1)

[Claims] The raw material is scum or sediment (excess sludge) generated in the process of treating wastewater discharged from seafood processing plants, and is granulated by adsorbing and mixing with chicken manure and bone meal.
A method for producing an organic fertilizer, which further comprises performing an aerobic fermentation process by maintaining the temperature at about 60 to 80°C in fermentation equipment, and then drying the product to a moisture content of about 30% or less.