JPH10286068A - Method for processing and using waste internal organ of scallop - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple method for separating waste internal organs from an aqueous solution and a method of utilizing the separated waste internal organs, to thereby enable disposal of a large amount of waste internal organs at low cost. SOLUTION: When a solution having been removed of Cd is treated for solid-liquid separation by filtration, organic substances such as rice husks, sawdust, beer cake, etc., that are useful for livestock feed, diet and fertilizer are used as the filtering material. When the solid-liquid separation is conducted after using an acid solution, pulverized scallop shell is used as the filtering material. The treated solid and the filtering material are mixed to be used for useful applications.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for solid-liquid separation in the treatment of scallop uro and the effective use of the scallop uro.

[0002]

2. Description of the Related Art Heretofore, this type is as follows. The general method of fishery residue treatment is landfill disposal as industrial waste, and the method of landfilling is used almost as it is, and the method of landfilling after volume reduction by incineration etc. has also been tried. I have. Furthermore, it is known that fish residues can be used for fertilizers, feeds, and feeds, and studies and researches for practical use are underway. In this case, a device such as fermentation using a microorganism may be added. The sea urchin of the scallop, which occurs in a relatively large amount in the seafood residue,
It has been treated in a similar way. Strictly speaking, the uro is the midgut gland, but it often refers to the entire visceral organ that is normally discarded other than the scallop.

[0003]

The above-mentioned prior art has the following problems. 1. In recent years, scallop shells are less suitable for land reclamation, and incineration requires a large amount of money because it contains a large amount of water.Therefore, methods of effectively using fertilizers, feed, and feed have been studied. ing. However, at present, low-cost mass processing methods have not been established,
Problems such as illegal dumping have occurred. 2. Cd contained in order to make effective use of scallop uro
Is required. It is known that Cd removal itself can be achieved by a method such as immersion in an aqueous sulfuric acid solution, but a technique for separating urine and an aqueous solution in a subsequent process has not been established. 3. One of the solid-liquid separation methods applicable to large-scale processing at relatively low cost is gravity separation (floating / sedimentation). However, many fish residues have a small specific gravity difference from the aqueous solution. The target to which is applicable is limited. 4. Conventional filtration methods are intended for those with relatively low solids concentrations in the solution, so filtering high solids concentrations can cause clogging in a short period of time and replacement or regeneration of the filter media can occur very frequently. It is not practical because it is necessary. SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and has as its object to provide a method for easily separating scallop uro and an aqueous solution and a method for utilizing uro after separation. It enables low-cost, large-scale processing of scallop uro.

[0004]

Means for Solving the Problems In order to achieve the above object, the present invention is as follows. In performing the solid-liquid separation after the Cd removal treatment or the like, organic substances such as rice husks, sawdust, and beer lees, which can be used for feed, feed, and fertilizer, are used as a filtering material to perform filtration. In performing solid-liquid separation after using the acid solution, the neutralization step is omitted by using a filter material in which the shell of the scallop is powdered. Thereafter, the solid to be treated and the filter material are mixed and used effectively.

[0005]

Embodiments of the present invention will be described below with reference to the drawings based on embodiments. FIG. 1 is a flowchart of an example in which solid-liquid separation was performed on the scallop uro. In the first step, 200 g of uro is added to 600 ml of 3%
It was immersed in a sulfuric acid aqueous solution for 24 hours. In this step, Cd transfers from the urine to the sulfuric acid aqueous solution. In Examples, uro was crushed and used as a pretreatment. In the second step, organic matter that can be used for feed, feed, and fertilizer is adopted as a filtering material,
Filtration was performed. In this step, a solid and a liquid are separated. In Example 1, a commercially available rice husk was used as a filter material. In Example 2, sawdust was sieved at 0.85 to 2.0 mm to obtain a filtering material. In Example 3, 0.8 finer than Example 2 was used.
Sawdust less than 5 mm was used as a filtering material. In Example 4, the shell of the scallop was sized to 0.85 to 3.0 mm to obtain a filter material. The filtration conditions are shown in Table 1, and the filtration results are shown in Table 2.

[0006]

[Table 1]

[0007]

[Table 2]

After the filtration, if necessary, washing and neutralization are performed. By this treatment, the removal of Cd proceeds more, and the damage due to the remaining sulfuric acid can be prevented. In the examples, washing was performed using water three times the amount of the sulfuric acid aqueous solution, and the scallop was neutralized with shell powder. In Example 4, neutralization could be omitted.

In the third step, the urine and the filter medium remaining on the filter medium were discharged from the filter and mixed.

[0010] In the fourth step, the mixture of uro and the filter medium was dried by a usual method. In each case, solid-liquid separation could be easily performed. About Example 1 and Example 2, the rough evaluation as a fertilizer of the obtained solid mixture was performed. Table 3 shows the results.

[0011]

[Table 3]

The obtained solid mixture contains effective components such as nitrogen, phosphorus and potassium, and has a low harmful component Cd, so that it can be effectively used as a fertilizer or a soil conditioner.
For Examples 2 and 3, the particle size of the sawdust could be adjusted to change the clarity of the filtered solution. In addition, the amount and the packing density of the filter medium affect the filtration speed and the like, but can be appropriately selected within a range that does not cause clogging. In Example 4, filtration and neutralization could be performed simultaneously using scallop shell powder. In addition, since the liquid obtained by filtration also contains an active ingredient as a fertilizer or the like, it can be separately and effectively used as a fertilizer or the like. It is also conceivable that the wastewater is discharged together with the washing wastewater. Each requires Cd precipitation treatment with neutralization and a chelate compound, and when discharging, BOD reduction measures such as activated sludge method are required.

[0013]

Since the present invention is configured as described above, the following effects can be obtained. 1. A large amount of scallop urine and solution can be easily separated. 2. Replacement or regeneration of the filter material can be omitted. 3. Waste materials can be used as filter media. 4. The clarity of the solution after solid-liquid separation can be selected by adjusting the particle size of the filter medium. 5. If scallop shell powder is used for the acid solution, the neutralization step can be omitted. 6. The filtration material and the material to be treated can be mixed and effectively used as fertilizers.

[Brief description of the drawings]

FIG. 1 is a flow chart of an embodiment in which solid-liquid separation is performed on scallop urine.

Claims (3)

[Claims] 1. A scallop characterized by solid-liquid separation by a filtration method using a material mainly composed of an organic substance such as rice hulls, sawdust and beer cake after a solution treatment of scallop uro. Uro treatment method. 2. After the scallop is treated with an uro acid solution,
A method for treating scallop urine, comprising simultaneously performing solid-liquid separation and neutralization by a filtration method using a material mainly composed of scallop shell powder as a filtering material. 3. A method of using scallop urine, which comprises mixing scallop urine separated from the solution by the method according to claim 1 or 2 with a filter material to obtain fertilizer, feed, and feed. .