JPS63134592A - Manufacture of fertilizer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a single-art fertilizer for greenhouse horticulture and home use, and also aims to effectively utilize phosphorus recovered from wastewater as fertilizer. It is something that exists.

[Conventional technology]

The present inventor has developed the catalytic dephosphorization method (to remove phosphorus in the liquid from Ca).
We have been conducting research on the recovery of phosphorus from wastewater using a method in which phosphorus is removed from the liquid by bringing it into contact with phosphate minerals in the presence of chlorine and chilkali, and crystallizing phosphorus in the form of calcium phosphate on the minerals. However, it has been confirmed that the granules obtained by this catalytic dephosphorization method are useful as raw materials for fertilizer. However, although this granular material had a high soluble phosphorus content, it had a low water-soluble phosphorus content, and its ability to supply phosphorus to plants at the initial stage of fertilization was poor, so it was not suitable as a phosphate fertilizer as it was.

[Problem that the invention seeks to solve]

The present invention solves the above problems and effectively utilizes the calcium phosphate granules itself recovered from wastewater as fertilizer.
The present invention provides a fertilizer that forms an environment in which microorganisms can easily propagate after fertilization, and gradually supplies phosphorus through the M mechanism produced by the microorganisms.

[The structure of the invention]

The present invention is a method for producing fertilizer characterized by supporting organic fertilizer powder on granules containing calcium phosphate as a main component.

An embodiment of the method of the present invention will be described below based on the drawings.

In FIG. 1, phosphorus-containing wastewater (treated human waste water, food factory wastewater) 1 is introduced into a reaction tank 4.

The reaction tank 4 is filled with contact particles 5 capable of supporting apatite, and a fluidized bed state is formed by a water flow.

Phosphorus contained in wastewater forms apatite particles based on the reaction of the following formula, the particles crystallize on the contact particles 5, and the particles enlarge as follows.

5Ca + 3PO4” + OH−+Cat(OH
XPOi)s The enlarged particles are drawn out from the bottom 9' of the reaction tank 4, and the treated water 10 from which phosphorus has been removed is discharged to the outside of the system.

The particles to be filled into the reaction tank 4 have a particle size Q of 1 to 1.
0 phosphate rock, bone charcoal, magnesia clinker, etc. can be used.

Calcium and alkali sources necessary for the reaction include Ca(O
R) 1, can be supplied in the form of NaOH, CaC4, CaSO4, etc., and it can be supplied in the form of 1, NaOH, CaC4, CaSO4, etc.
5 to 5 times the amount is preferred.

In the calcium phosphate crystallization step of the present invention,
When wastewater contains a large amount of organic matter, the organic matter is captured and fixed in the crystallized calcium phosphate, so that the amount of organic matter carried in the latter stage can be reduced.

The particles 9' carrying apatite drawn out from the reaction tank 4 are supplied to the granulation dryer 6.

The particles are then mixed with the organic fertilizer supplied from 8 and brought into contact with hot air 7 to granulate the organic fertilizer onto the particles 9'' and discharge as a product 9. In the granulation process, the particles The particles 9' are in a wet state, and the organic fertilizer is fixed on the particles 9' due to the affinity between calcium phosphate and the organic fertilizer.

As the granulation dryer, a rotary granulator or a gJtwl dry granulator can be used.

Various organic fertilizers can be used depending on the purpose, but fish cake powder, meat cake powder, and rapeseed oil cake are preferred.

As shown in FIG. 2, the particles 9' carrying apatite are
A 7-batite product B is fixed on the particles A, and an organic fertilizer C is supported on the particles 9' of the granules 9, which become spring products, as shown in FIG. .

When the fertilizer of the present invention obtained by the above method is applied to soil, microorganisms breed on the surface and inside of the fertilizer, and organic acids generated during the process of decomposing organic matter penetrate into the inside and dissolve the calcium phosphate inside. urge This makes it possible to supply phosphorus to plants from the early stage of spraying.

According to the present invention, calcium phosphate recovered from wastewater can be used as fertilizer, and by supporting organic fertilizer on particles composed of calcium phosphate, the dissolution of calcium phosphate is promoted, and phosphorus is transferred to plants. It provides a stable supply, is easy to handle in granular form, and does not have the problem of leaving phenolic resin or sulfur behind, unlike commercially available buffer fertilizers, even when applied to the soil as a home gardening fertilizer.

Example 1 Secondary treated human waste water containing 10 to 15 q/l of phosphorus was mixed into 1.
88 m" phosphate rock with an effective diameter of α1■ at a rate of 7 days.
Water was passed through a 10 cWIφ×300 crnH column packed to a thickness of 0.03 mm and fluidized by a water stream. The column effluent water (treated water) was circulated at a rate of 1.88 m'' every 7 days and mixed with raw water.

By injecting 2% slaked lime into the circulating treated water, the pH of the treated water is 9.
．． Adjust so that it is between 0 and 9.5.

When the particle size of the phosphate rock grew 1.5 times, it was pulled out from the column.

The particle 459 is 150c! At the same time as being introduced into a rotary granulator of nφX 100 cmH, meat cake powder 452 is supplied, and rotary granulation is carried out under hot air at 200°C.

Table 1 shows the analysis results of the missing items, meat dregs powder, and kuro wood (phosphate rock with apatite attached) to which calcium phosphate was attached.

Table-1

[Brief explanation of the drawing]

Figure 1 is a diagram for explaining an example of the fertilizer packaging method of the present invention, Figure 2 is a diagram showing particles to which apatite is attached, and Figure 3 is a diagram showing fertilizer particles further compounded with organic fertilizer. It is. 1... Sewage containing phosphorus, 2... Circulating water, 4...
・Reaction equipment, 5... Contact particles, 6... Granulation dryer, 7
...Warm air, 8.Organic fertilizer, 9.Rice products /
Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A method for producing fertilizer, which comprises supporting organic fertilizer powder on granules containing calcium phosphate as a main component. 2. The method according to claim 1, wherein the granular material is obtained by recovering phosphorus from wastewater as calcium phosphate when recovering phosphorus from wastewater by a catalytic dephosphorization method. 3. The method according to claim 1 or 2, wherein the organic fertilizer is fish cake powder, meat cake powder, or rapeseed cake powder.