CN109604296B - Method for treating marine biological resources - Google Patents
Method for treating marine biological resources Download PDFInfo
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- CN109604296B CN109604296B CN201811067967.6A CN201811067967A CN109604296B CN 109604296 B CN109604296 B CN 109604296B CN 201811067967 A CN201811067967 A CN 201811067967A CN 109604296 B CN109604296 B CN 109604296B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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Abstract
An object of the present invention is to provide a method for treating a marine organism resource, which can relatively easily produce a marine organism resource in which the elution amount of heavy metals is suppressed. The present invention is a method for treating a marine biological resource containing marine algae or shellfish into which seawater is mixed during intake of the seawater, comprising a step of mixing a heavy metal insolubilizing agent with the marine biological resource containing water, and a step of drying the mixture obtained after the mixing step. The method for treating a marine biological resource may further comprise a step of heating the marine biological resource containing water before the mixing step. The marine biological resource may contain arsenic. The heavy metal insolubilizing agent may be iron powder.
Description
Technical Field
The invention relates to a method for treating marine biological resources.
Background
Seawater is used for obtaining raw materials such as salt and alkali metals, domestic water, ballast water, and cooling water. When obtaining seawater, various marine biological resources may be mixed in depending on the time and place of water intake. Examples of the marine biological resource into which seawater is mixed when the seawater is taken include marine algae and shellfish.
These marine biological resources mixed in when seawater is taken are generally treated as industrial waste. When marine biomass resources are treated as industrial waste, drying treatment is performed on the marine biomass resources for the purpose of reducing the volume and suppressing rancidity.
It is known that seaweeds contain a large amount of arsenic, and shellfish meat, viscera, or midgut gland (ウロ) contains arsenic, cadmium, hexavalent chromium, and the like. In addition, when the content of arsenic in the marine biological resource is high, the amount of arsenic eluted from the marine biological resource tends to increase. Therefore, when the marine biological resource contains arsenic in a large amount, the amount of arsenic eluted from the marine biological resource after drying exceeds a standard value that can be legally set for disposal as industrial waste.
Arsenic in marine life resources is dissolved out in water when the marine life resources are immersed in water. Therefore, if a treatment is employed in which, for example, a marine organism resource is put into boiling boiled water and then the marine organism resource is washed with water, the arsenic content of the marine organism resource is reduced. However, this treatment requires a large amount of energy for preparing boiled water, and post-treatment of used boiled water and rinse water containing arsenic.
On the other hand, a method of treating waste of fishes and shellfishes in which fungi are added to the waste of fishes and shellfishes has been proposed (patent document 1). Patent document 1 suggests that heavy metals in fish and shellfish waste can be removed by adding sulfurous bacteria, nitrobacteria, and nitrites to the fish and shellfish waste, decomposing arsenic and cadmium remaining in the fish and shellfish waste, and discharging the decomposed arsenic and cadmium into the atmosphere. However, the processing method of patent document 1 requires temperature management for keeping the activity of fungi active, and requires a very long time for processing.
[ Prior art documents ]
[ patent document ]
[ patent document 1 ] Japanese patent application laid-open No. H10-114589
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for treating a marine organism resource, which can relatively easily produce a marine organism resource in which the elution amount of heavy metals is suppressed.
The present invention made to solve the above problems is a method for treating a marine biological resource containing marine algae or shellfish mixed in during intake of seawater, comprising: mixing a heavy metal insolubilizing agent with the marine organism resource containing water; and drying the mixture after the mixing step.
Heavy metals contained in marine resources are eluted into water because the marine resources contain water. In this method for treating a marine biological resource, since the method includes the step of mixing a heavy metal insolubilizing agent with the marine biological resource in a state containing water, heavy metals are eluted from the marine biological resource into the water, and the heavy metals eluted into the water are insolubilized. In addition, in this method for treating a marine biological resource, since the marine biological resource in which the heavy metal insolubilizing agent is mixed is dried in a state in which the heavy metals are insolubilized, the marine biological resource in which the elution amount of the heavy metals is suppressed can be relatively easily produced without requiring much energy and washing water.
The method for treating a marine biological resource may further comprise a step of heating the marine biological resource containing moisture before the mixing step. Thus, the method for treating a marine organism resource can produce a marine organism resource in which the elution amount of heavy metals is sufficiently suppressed by greatly reducing the content of heavy metals in the marine organism resource and insolubilizing the heavy metals eluted into water.
The marine biological resource may contain arsenic. Thus, the method for treating a marine organism resource can produce a marine organism resource in which the elution amount of arsenic is suppressed.
The heavy metal insolubilizer may be iron powder. Since iron can insolubilize lead, cadmium, hexavalent chromium, selenium, and the like by adsorption in addition to arsenic, this method for treating a marine biological resource can produce a marine biological resource in which the elution amount of these heavy metals is suppressed.
The method for treating a marine biological resource of the present invention can relatively easily produce a marine biological resource in which the elution amount of heavy metals is suppressed.
Drawings
FIG. 1 is a flowchart illustrating a method for treating a marine biological resource according to an embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the method for treating marine resources according to the present invention will be described in detail.
The method for treating marine biological resources comprises the steps of: a heating step S1 for heating a water-containing marine organism resource; a mixing step S2 of mixing a heavy metal insolubilizing agent with a water-containing marine organism resource; and a drying step S3 of drying the mixture after the mixing step S2. Here, the water-containing marine organism resource means a marine organism resource which is not dried and in which sea water or wash water is attached.
< heating Process >
The heating step S1 is a step of heating the marine biological resource containing moisture, and is performed to promote elution of heavy metals contained in the marine biological resource into the moisture. The heating of the water-containing marine biological resource is not particularly limited, and for example, heat release by absorption of sunlight, combustion heat of fossil fuel, exhaust heat from a plant such as a power plant, geothermal heat, and the like can be used.
(marine organism resources)
The marine biological resource to be treated in the method for treating a marine biological resource is a marine biological resource containing marine algae or shellfish mixed at the time of extracting seawater, and examples thereof include marine algae floating in the sea, and shellfish attached to a waterway, pit, or pipe of a water intake device. These marine biological resources are taken out from seawater during or after taking water, but may contain a large amount of heavy metals such as arsenic, lead, cadmium, hexavalent chromium, and selenium as harmful substances. For example, sargassum fusiforme, sargassum, and other seaweeds contain a large amount of arsenic, and shellfish such as barnacles and perna contain a large amount of arsenic, cadmium, hexavalent chromium, and the like in shellfish meat, viscera, or midgut gland. The method for treating marine life resources is particularly preferable when marine life resources containing a large amount of heavy metals are selected as the treatment target. The marine organism resource includes at least one of marine algae and shellfish, but may include other marine organisms such as fish.
The lower limit of the holding temperature when the marine biological resource containing water is heated in the heating step S1 is preferably 30 ℃, more preferably 35 ℃, and still more preferably 40 ℃. On the other hand, the upper limit of the holding temperature is preferably 100 ℃, more preferably 80 ℃, and still more preferably 70 ℃. If the holding temperature is lower than the lower limit, elution of heavy metals contained in the marine biological resource into water may not be promoted. Conversely, if the holding temperature is higher than the upper limit, an excessively high heating energy may be required.
The heating step S1 may be performed appropriately depending on the type and amount of heavy metals contained in the marine biological resource, or may not be performed when the solubility of heavy metals contained in the marine biological resource in water is high or when the amount of heavy metals contained in the marine biological resource is small.
< mixing Process >
The mixing step S2 is a step of mixing a heavy metal insolubilizer with the marine biological resource containing water, and is performed to insolubilize heavy metals eluted from the marine biological resource into water. The mixing of the water-containing marine organism resources with the heavy metal insolubilizing agent is not particularly limited, and for example, a batch mixer or a method of continuously supplying the heavy metal insolubilizing agent from a hopper to the water-containing marine organism resources being transported by a transport device may be employed.
(heavy Metal insolubilizers)
The heavy metal insolubilizer is an additive having a function of insolubilizing heavy metals eluted into water. Examples of the heavy metal insolubilizing agent include iron powder, a curing agent, ferric chloride, and polyaluminum chloride. Examples of the curing agent include lime-based curing agents, magnesia-based curing agents, and cement-based curing agents. However, when the curing agent is used, it is necessary to elute heavy metals from marine biological resources before the curing agent is solidified with moisture, and when ferric chloride and polyaluminum chloride are used, they need to be kept in a liquid state until they are coprecipitated with heavy metals. On the other hand, iron powder does not require any special operation, and arsenic and heavy metals such as lead, cadmium, hexavalent chromium, and selenium can be adsorbed and insolubilized. Therefore, it is particularly preferable that the heavy metal insolubilizing agent used in the method for treating a marine biological resource is iron powder.
When iron powder is used as the heavy metal insolubilizer, examples of the iron powder include reduced iron powder, atomized iron powder, alloyed steel powder, iron oxide powder, and slag powder. However, the content of metallic iron in the iron powder is preferably 80 mass% or more, and more preferably 90 mass% or more, from the viewpoint of the adsorption capacity of heavy metals. Here, the metallic iron means iron having a valence of 0.
The average particle size of the iron powder as the heavy metal insolubilizer is selected in consideration of the adsorption capacity of the iron powder to the heavy metals and the ease of handling in mixing. The lower limit of the average particle diameter of the iron powder is preferably 0.02mm, more preferably 0.07mm, and still more preferably 0.10 mm. On the other hand, the upper limit of the average particle diameter of the iron powder is preferably 1mm, more preferably 0.8mm, and still more preferably 0.5 mm. If the average particle size of the iron powder is less than the lower limit, handling of the iron powder when it is mixed with a marine organism resource containing water may become difficult. Conversely, if the average particle size of the iron powder is higher than the upper limit, the specific surface area of the iron powder becomes small, and the ability to adsorb heavy metals may decrease. The average particle diameter of the iron powder is, for example, a volume average particle diameter (D50) determined from a particle size distribution measured by a laser diffraction particle size distribution measuring apparatus.
The amount of the iron powder as the heavy metal insolubilizer is selected in consideration of the adsorption capacity of the iron powder to the heavy metals and the economic efficiency. The lower limit of the mixing ratio of the iron powder to the marine biological resource is preferably 1:50, more preferably 1:30, and still more preferably 1:20 on a mass basis. On the other hand, the upper limit of the mixing ratio is preferably 2:1, more preferably 1.5:1, and still more preferably 1: 1. If the mixing ratio is less than the lower limit, the adsorption capacity of the iron powder to the heavy metals may be insufficient, and elution of the heavy metals from the marine biological resources after the drying step S3 may not be suppressed. On the other hand, if the mixing ratio is higher than the upper limit, the amount of iron powder used for mixing increases, and the cost may become excessively high.
< drying Process >
The drying step S3 is a step of drying the mixture after the mixing step S2, and is performed for the purpose of reducing the volume of the marine organism resource mixed with the heavy metal insolubilizing agent and suppressing rancidity. The drying of the mixture is not particularly limited, and for example, a batch dryer such as an oven or a continuous dryer such as a rotary kiln can be used. The mixture is dried to remove moisture.
The dried product after the drying step S3 may be filled in bulk bags or buckets or directly loaded into the truck bed, and when discarded as industrial waste, it may be transported to a disposal site, or when extracted raw materials, fertilizers, or feeds as active ingredients are reused, it may be transported to a recycling plant.
(advantages)
This method for treating a marine biological resource comprises a mixing step S2 of mixing a heavy metal insolubilizing agent with a marine biological resource containing water, and thus, in a state where heavy metals are eluted from the marine biological resource into water, the heavy metals eluted into the water are insolubilized. In addition, in the method for treating a marine biological resource, the marine biological resource mixed with the heavy metal insolubilizing agent is dried in a state where the heavy metals are insolubilized in the drying step S, and therefore, the marine biological resource in which the elution amount of the heavy metals is suppressed can be relatively easily produced without requiring much energy and washing water.
In addition, since the method for treating a marine biological resource includes the heating step S1 of heating a marine biological resource containing water before the mixing step S2, the content of heavy metals in the marine biological resource is significantly reduced, and the heavy metals eluted into the water are not dissolved, whereby a marine biological resource in which the elution amount of heavy metals is sufficiently suppressed can be produced.
In particular, in the method for treating marine biological resources, iron powder is used as a heavy metal insolubilizing agent, and lead, cadmium, hexavalent chromium, selenium, and the like can be insolubilized by the adsorption action of iron in addition to arsenic. Therefore, the method for treating a marine organism resource can produce a marine organism resource in which elution amounts of various heavy metals including arsenic are suppressed.
The marine organism resources produced by the method for treating marine organism resources and having suppressed elution of heavy metals can be discarded as industrial waste, and if necessary, can be reused as raw materials for extraction of effective components such as vitamins, minerals, dietary fibers, etc., as fertilizers in fields, or as animal feeds. Therefore, the method for treating marine biological resources also has a possibility of contributing to reduction of environmental load.
< other embodiments >
The method for treating marine biological resources according to the present invention is not limited to the above embodiment.
In the above embodiment, the description has been given of the mode in which the water-containing marine biological resource is heated in the heating step S1 before the mixing step S2, but the heating time of the water-containing marine biological resource may be after the mixing step S2, for example, in a method for treating a marine biological resource, a step of heating the mixture after the mixing step S2 may be provided before the drying step S3. However, since it takes a certain time to elute heavy metals from the marine organism resources and to insolubilize heavy metals with the heavy metal insolubilizer during heating, it is preferable to heat the marine organism resources containing moisture before the mixing step S2 as in the above embodiment from the viewpoint of time efficiency.
[ examples ] A method for producing a compound
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
[ heating test ]
First, the amount of arsenic eluted from Sargassum of the genus Sargassum was measured based on a method for testing metals contained in industrial waste (Showa 48 years environmental agency Notification No. 13 test). The arsenic elution amount of seaweed was 1.2 mg/L.
Next, 100g of seaweed of the genus Sargassum was added to 5000g of boiled water obtained by boiling pure water to 100 ℃ and kept at 100 ℃ for 120 minutes. Thereafter, the seaweed taken out of the boiled water was put into 25 ℃ rinsing water and kept for 3 minutes. The washed seaweed was dried in a thermostatic oven at 180 ℃ for 30 minutes. If the arsenic concentration of boiled water and washing water is measured, the arsenic concentration is 0.72mg/L and 0.008mg/L respectively. The weight of the dried seaweed was 43 g. Further, as a result of measuring the amount of arsenic eluted from the dried seaweed based on the test No. 13 of the environmental agency in Showa 48 years, the amount of arsenic eluted was 0.06 mg/L.
[ tests No.1 to No.4 ]
100g of Sargassum in moisture state and various amounts of iron powder are uniformly mixed on a square pan (バット: vat), and the mixture is inserted into a thermostatic oven at 105 deg.C and dried for 6 hr. Thereafter, the amount of arsenic eluted from the dried product was measured based on the test No. 13, which is reported in the environmental agency of showa 48 years. The state of the seaweed before treatment, the weight of the iron powder mixed with the seaweed and the amount of arsenic eluted from the dried product are shown in Table 1. No.4 is a test of an unmixed iron powder.
[ tests No.5 to No.8 ]
100g of previously dried Sargassum of genus Sargassum is mixed with various amounts of iron powder in a vinyl bag. Thereafter, the arsenic elution amount of the mixture was measured based on the test No. 13, which is the environmental agency report in showa 48 years. The state of the seaweed before treatment, the weight of the iron powder mixed with the seaweed and the arsenic elution amount of the mixture are shown in Table 1. No.8 is a test of an unmixed iron powder.
[ TABLE 1 ]
| No. | Seaweed status | Iron powder weight (g) | Arsenic elution amount (mg/L) |
| 1 | Containing water | 100 | 0.11 |
| 2 | Containing water | 10 | 0.21 |
| 3 | Containing |
1 | 0.35 |
| 4 | Containing water | 0 | 2.0 |
| 5 | Drying | 100 | 0.30 |
| 6 | Drying | 10 | 0.51 |
| 7 | |
1 | 2.0 |
| 8 | Drying | 0 | 2.4 |
As shown in Table 1, it was confirmed that the amount of arsenic eluted from the seaweed decreased when the amount of iron powder added to the seaweed was increased. In addition, in the test of Nos. 1 to 3 in which iron powder was added to the seaweed in a moisture-containing state, it was confirmed that the former significantly reduced the arsenic elution amount of the seaweed as compared with the test of Nos. 5 to 7 in which iron powder was added to the seaweed dried in advance.
In the tests of Nos. 3 to 8, the arsenic elution amount of the dried product or the mixture showed a value of 0.3mg/L or more, which is the standard upper limit of the arsenic elution amount specified in the domestic waste treatment method, and in the tests of Nos. 1 and 2, the arsenic elution amount of the dried product was confirmed, and the value was shown to be lower than the standard upper limit.
From the above results, it can be said that when a certain amount or more of iron powder is added to the seaweed containing water, the amount of arsenic eluted from the seaweed can be effectively suppressed. In addition, according to the heating test, it can be said that the arsenic contained in the seaweeds is efficiently eluted to the water by heating the seaweeds, and therefore, when the iron powder is added after the seaweeds in the state of containing water are heated, a higher effect of suppressing the elution amount of arsenic can be expected.
[ industrial applicability ]
The method for treating a marine biological resource of the present invention can relatively easily produce a marine biological resource in which the elution amount of heavy metals is suppressed from a marine biological resource containing marine algae or shellfish into which seawater is mixed at the time of intake. Therefore, the method for treating marine biological resources can treat industrial waste and reuse the waste as resources even if the marine biological resources contain a large amount of heavy metals.
Claims (4)
1. A method for treating a marine biological resource containing marine algae or shellfish mixed in the intake of seawater, comprising the steps of
A step of mixing a heavy metal insolubilizing agent with the marine organism resource containing water, and
a step of drying the mixture after the mixing step,
the heavy metal insolubilizing agent is iron powder,
the iron powder is reduced iron powder, atomized iron powder, alloy steel powder, iron oxide powder or slag powder,
the mixture after the above-mentioned drying process is used for fertilizer or feed.
2. The method of claim 1, further comprising a step of heating the marine biological resource containing water before the mixing step.
3. The method for treating a marine biological resource according to claim 1, wherein the marine biological resource contains arsenic.
4. The method for treating a marine biological resource according to claim 2, wherein the marine biological resource contains arsenic.
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| JP2017194676A JP6875973B2 (en) | 2017-10-04 | 2017-10-04 | How to treat marine biological resources |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2667986B2 (en) * | 1994-09-29 | 1997-10-27 | 北海道 | Method and apparatus for removing heavy metals contained in organisms |
| JPH08187488A (en) * | 1995-01-10 | 1996-07-23 | S F Plan:Kk | Treatment of marine products containing cadmium |
| JP4547516B2 (en) * | 2000-11-28 | 2010-09-22 | 独立行政法人 日本原子力研究開発機構 | How to remove harmful metals from scallop scales |
| JP2010057442A (en) * | 2008-09-05 | 2010-03-18 | Hokkaido Univ | Method for removing heavy metal from fish and shellfish containing harmful heavy metal in short time, and manufacturing method of foodstuff obtained by the same |
| CN101905910A (en) * | 2009-06-05 | 2010-12-08 | 中国科学院生态环境研究中心 | Reactor for removing arsenic in water on basis of iron-based composite oxide |
| CN101637709A (en) * | 2009-07-10 | 2010-02-03 | 广东海洋大学 | Methods for preparing carboxymethyl chitosan magnetic microspheres and adsorbing cadmium in oyster meat by using carboxymethyl chitosan magnetic microspheres |
| CN101607996B (en) * | 2009-07-21 | 2012-02-15 | 大连工业大学 | Method for removing heavy metal ions from marine shellfish polysaccharide |
| CN101999330A (en) * | 2010-11-17 | 2011-04-06 | 天津师范大学 | Method for purifying noxious substances in edible bivalves |
| CN102786578A (en) * | 2011-07-25 | 2012-11-21 | 中国科学院烟台海岸带研究所 | Method for removing heavy metal in marine animal protein enzymed liquid |
| CN104026652A (en) * | 2014-02-28 | 2014-09-10 | 国家海洋局第三海洋研究所 | Preparing method of food grade marine-organism-sourced shell micro powder |
| CN104651066A (en) * | 2015-02-02 | 2015-05-27 | 天津市朴优科技有限公司 | Detergent capable of removing heavy metals from aquatic product and preparation method of detergent |
| CN106281331A (en) * | 2015-05-18 | 2017-01-04 | 南京凯杰环境技术有限公司 | A kind of manufacture method of ferrum system heavy metal-polluted soil immobilization material |
| JP6688576B2 (en) * | 2015-08-20 | 2020-04-28 | Ｄｏｗａエコシステム株式会社 | Decontamination method for contaminated soil |
| CN106583422B (en) * | 2016-12-25 | 2019-04-09 | 中南林业科技大学 | A kind of solidification arsenic slag technique with high salt |
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| JP2019063774A (en) | 2019-04-25 |
| JP6875973B2 (en) | 2021-05-26 |
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