JP3925122B2 - Jellyfish processing method - Google Patents

Description

【００４６】
表１より、本発明によれば、くらげの破砕処理に伴って生じる廃液を効率よく処理して良好な水質の処理水を得ることができることがわかる。
【００４７】
【発明の効果】
以上詳述した通り、本発明のくらげの処理方法によれば、くらげを減容化すると共に、減容化に伴って生じる廃液を十分に浄化処理することができる。
【図面の簡単な説明】
【図１】 本発明のくらげの処理方法の実施の形態を示す系統図である。
【符号の説明】
１ くらげ貯留槽
２ くらげ破砕手段
３ 凝集分離槽
４ 濾過器
５ 活性炭塔
６ 脱水機
７ 泡沫固化槽[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of treating saddle up, in particular, to a method of processing a recovered seawater waterway for water sampling the industrial cooling water or the like saddle up efficiently.
[0002]
[Prior art]
In plants such as power plants, chemical complexes, and steelworks, seawater is used in large quantities as industrial cooling water, but the seawater channel for sampling seawater has a large amount of floating properties such as jellyfish and seaweed. Marine life rushes. If these floating jellyfish and other floating marine organisms are left unattended, they will cause various obstacles such as pipe blockage, reduction in seawater sampling, cooling efficiency, equipment failure, and equipment operation efficiency such as power generation equipment. A screen is installed at the entrance of the road, and the jellyfish that have been pushed up are collected and disposed of. In particular, jellyfish breed abnormally in the summer, and dozens of tons are captured a day by the screen of the intake.
[0003]
Traditionally, jellyfish, etc., as a residue have been left in holes dug in the ground, but due to the large amount in summer, odors such as spoilage of fish and sewage from dumped places There was a problem of environmental pollution such as spillage, and the problem of securing the dumping site and the cost of transporting it to the dumping site was also a big problem.
[0004]
As a method of crushing the recovered jellyfish to separate it into solids and moisture, JP-B-1-33343 discloses that the jellyfish is crushed and dehydrated, and the dehydrated filtrate is oxidized with sodium hypochlorite. Then, a method of aggregating and separating, followed by activated carbon treatment is described.
[0005]
[Problems to be solved by the invention]
In the method disclosed in Japanese Patent Publication No. 1-331347, the crushed marine organisms are likely to rot and generate odor. Moreover, the COD load of the liquid to be purified is high and the COD of the final treated water is slightly high.
[0006]
The present invention is described above to solve the conventional problems, it is possible to reduce rancidity in processing saddled down, you are also possible to process so as to reduce sufficiently the COD of the waste liquid generated by the processing of jellyfish It is an object to provide a simple processing method.
[0007]
[Means for Solving the Problems]
The jellyfish processing method of the present invention includes a step of crushing a jellyfish to obtain crushed material-containing water, a step of adding alum and an oxidizing agent to the crushed material-containing water, and then adding a flocculant to agglomerate separation treatment. And a purification step for purifying the separated water obtained by the coagulation separation process.
[0008]
According to jellyfish processing method according the present invention, since the addition of alum to the crushed water containing jellyfish, odor development from jellyfish crushed-containing water is suppressed by anti-corruption action of the alum.
[0009]
Since this alum also has a foam solidifying action, the foam is easily removed in the coagulation separation step. That is, by adding alum to jellyfish crushed material-containing water, proteins in the crushed material-containing water coagulate. For this reason, protein etc. are fully separated and removed in the aggregation separation step, the COD load in the subsequent purification treatment step is reduced, and the COD of the final treated water can be lowered.
[0010]
In addition, in this invention, after adding alum, you may isolate | separate foam prior to aggregation separation. If it does in this way, it will also become possible to reduce the usage-amount of a coagulant | flocculant and to perform the aggregation separation of suspended substances other than a foam efficiently.
[0011]
In the present invention, it is preferable that the separated water after the coagulation and separation is filtered and purified by treating the obtained filtered water with activated carbon.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
FIG. 1 is a system diagram showing an embodiment of the jellyfish processing method of the present invention .
[0014]
The jellyfish that has been pushed to the intake channel and caught by the bar screen or the like at the entrance is stored in the jellyfish storage tank 1. This jellyfish is first crushed by the jellyfish crushing means 2. By crushing the jellyfish, water containing jellyfish can be obtained. In this case, the jellyfish stored in the storage tank 1 may be transferred to a crusher such as a mixer for crushing, but the transfer path for transferring from the storage tank 1 to the subsequent foam separation tank 3 is crushed with a rotating blade. A pump may be provided and transferred while being crushed. If the crushing pump is used in this way, the jellyfish-containing water can be transferred at a constant flow rate.
[0015]
In this embodiment, after adding an oxidizing agent and alum to this jellyfish crushed material-containing water, it is introduced into the foam separation tank 3.
[0016]
As the oxidizing agent, a chlorine-based oxidizing agent (for example, a hypochlorite such as sodium hypochlorite, a perchlorate such as sodium perchlorate), hydrogen peroxide, or gaseous oxygen is suitable. Gaseous oxygen can be added to jellyfish crushed material-containing water, for example, by air aeration. In the case of a chlorine-based oxidizing agent, the amount added is preferably about 100 to 5000 mg / L. In the case of hydrogen peroxide, the addition amount is preferably about 30 to 3000 mg / L. In the case of air aeration, it is preferable to supply air at a rate of 1 to 20 L / min with respect to 1 L of water.
[0017]
As alum, specifically, a composite salt of aluminum sulfate (Al ₂ (SO ₄ ) ₃ ) and another substance can be used. As the composite salt, aluminum sulfate potassium AlK (SO ₄ ) ₂ (potassium Alum), sodium aluminum sulfate AlNa (SO ₄ ) ₂ (sodium alum), and the like. These alums may be used alone or in combination of two or more. As alum, potassium alum is preferably used because it is particularly excellent in foam solidification effect and rot odor prevention effect.
[0018]
The addition amount of this alum is preferably about 50 to 5000 mg / L, particularly preferably about 500 to 2000 mg / L with respect to the jellyfish-containing water. For example, about 5000 to 20000 mg / L is added as a 10 wt% aqueous solution of potassium alum. It is preferable to do this.
[0019]
The jellyfish crushed material-containing water to which the oxidizing agent and alum have been added is separated into a foam component solidified by alum and a liquid component in the foam separation tank 3. As this foam separation tank 3, for example, one that scrapes and separates the foam with a rake or the like can be used.
[0020]
The foam separated in the foam separation tank 3 is added with a polymer flocculant, preferably about 5 to 100 mg / L, preferably about 20 to 50 mg / L as a flocculant together with agglomerated sludge in the agglomeration separation tank 4 described later. Then, dehydration is performed by a dehydrator 7 such as a filter press, a belt press, or a centrifugal dehydrator. The dehydrated filtrate obtained by dehydration is preferably mixed with the liquid component and treated. Dehydrated cake is disposed of by landfill or incineration.
[0021]
The liquid component from the foam separation tank 3 is transferred to the coagulation / separation tank 4 together with the dehydrated filtrate of the dehydrator 7 and added to the coagulant to be coagulated and separated.
[0022]
As the flocculant used here, iron salts such as ferric chloride and ferric sulfate, and inorganic flocculants such as aluminum sulfate and polyaluminum chloride are suitable. The amount of the inorganic flocculant added is usually about 1000 to 10000 mg / L, for example about 1000 to 5000 mg / L in the case of 38 wt% ferric chloride.
[0023]
In this agglomeration treatment, it is preferable to add an anionic polymer flocculant together as an agglomeration aid, and the addition amount is preferably about 1 to 20 mg / L, particularly about 3 to 10 mg / L.
[0024]
Although there is no restriction | limiting in particular as a form of this coagulation separation tank 4, Since the coagulation component of a jellyfish is light and it is easy to float, the coagulation separation tank by pressure flotation is suitable. However, a coagulation sedimentation tank may be used. The agglomerated sludge is preferably dehydrated by a dehydrator 7 and then disposed of by landfill, drying, incineration or the like. The agglomerated sludge may be mixed with foam and dehydrated by a dehydrator. As the dehydrator, various types such as a filter press, a belt press, and a centrifugal dehydrator can be used. The dehydrated filtrate is preferably returned to the flocculation separation tank 4 again.
[0025]
The separated water in the flocculation / separation tank 4 is filtered by the filter 5 and then treated by the activated carbon tower 6 to remove COD, and the treated water is discharged.
[0026]
The separation water purification means may be any means capable of removing COD in the coagulated separation water. In addition to the combination of the filter 5 and the activated carbon tower 6 as shown in FIG. 1, activated carbon treatment, biological treatment, A combination of one or more of COD oxidative decomposition, filtration, and adsorption treatment such as membrane filtration treatment may be employed.
[0027]
In the above embodiment, the oxidizing agent is added to the jellyfish crushed material-containing water almost simultaneously with the alum, but either the oxidizing agent or the alum may be added before the other. For example, after adding alum and separating foam, an oxidizing agent may be added, and then aggregating and separating treatment may be performed.
[0028]
The treated water may be dechlorinated after the above filtration or activated carbon treatment.
[0029]
In the above embodiment, the foam is separated after the alum is added, but the agglomeration separation process may be performed as it is without separating the foam.
[0030]
In the present invention, it is preferable to continue the post-process after the alum and oxidant addition process, but after the addition process 1-5 days later, the post-process (foam separation, coagulation separation, filtration, activated carbon treatment, etc.) May be performed. Addition of an oxidizing agent or the like suppresses spoilage and prevents odor generation, so there is no problem even if the post-process is delayed. If the amount of jellyfish is considerably smaller than the processing capacity of the processing device, and if the amount of jellyfish is too large to be processed compared to the processing capacity, it can be dealt with by processing it later.
[0031]
【Example】
Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.
[0032]
Example 1
The jellyfish was processed according to the flow shown in FIG.
[0033]
The jellyfish stored in the storage tank was crushed with a crushing pump, introduced into the foam separation tank 3 while adding an oxidizing agent and alum, and the foam was separated. As an oxidizing agent, an aqueous solution containing sodium hypochlorite having an effective chlorine concentration of 10% was added at a rate of 1000 mg / L (effective chlorine as 100 mg / L). As alum, a 10 wt% aqueous solution of potassium alum was added at a rate of 5000 mg / L (potassium alum addition amount 500 mg / L). Next, it is introduced into the flocculation / separation tank 4, and 38 wt% ferric chloride aqueous solution 2000 mg / L and anionic polymer flocculant 4 mg / L are added and subjected to pressure levitation separation to obtain flocculation levitation sludge and separated water. It was. This separated water was passed through a two-layer filter having an upper layer made of anthracite and the lower layer made of sand in a downward flow, and was then flowed downward to an activated carbon tower filled with granular activated carbon to obtain treated water.
[0034]
The coagulated and separated sludge was dehydrated with a centrifugal dehydrator, the dehydrated cake was discarded, and the dehydrated filtrate was returned to the coagulation / separation tank 4.
[0035]
Table 1 shows the COD concentration (CODMn) of jellyfish-containing water and treated water after crushing.
[0036]
Comparative Example 1
The same operation as in Example 1 was performed except that no alum was added, and the results are shown in Table 1.
[0037]
Example 2
In order to use oxygen in the air as an oxidant, the same operation as in Example 1 was performed except that air was blown from the diffuser at a rate of 2 L / min with respect to 1 L of water, and the results are shown in Table 1. It was.
[0038]
Comparative Example 2
The same operation as in Example 2 was performed except that no alum was added, and the results are shown in Table 1.
[0039]
Example 3
In Example 1, treatment was performed in exactly the same manner except that hydrogen peroxide was added as an oxidizing agent at a rate of 500 mg / L. The results are shown in Table 1.
[0040]
Comparative Example 3
The same operation as in Example 3 was performed except that no alum was added, and the results are shown in Table 1.
[0041]
Example 4
The same operation as in Example 3 was performed except that the amount of hydrogen peroxide added was 1000 mg / L. The results are shown in Table 1.
[0042]
Comparative Example 4
The same operation as in Example 4 was performed except that no alum was added, and the results are shown in Table 1.
[0043]
Example 5
The same operation as in Example 1 was performed except that the addition amount of an aqueous solution containing 10% effective hypochlorite sodium hypochlorite was 600 mg / L and the alum addition amount was 2500 mg / L. The results are shown in Table 1. .
[0044]
Example 6
The same operation as in Example 1 was performed except that the addition amount of hydrogen peroxide was 600 mg / L and the alum addition amount was 2500 mg / L. The results are shown in Table 1.
[0045]
[Table 1]

[0046]
From Table 1, it can be seen that according to the present invention, the waste liquid produced in association with the jellyfish crushing treatment can be efficiently treated to obtain treated water with good water quality.
[0047]
【The invention's effect】
As described above in detail, according to the saddle down the processing method of the present invention, as well as volume reduction saddled down, it is possible to sufficiently purify process waste that occurs with the volume reduction.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an embodiment of a jellyfish processing method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Jellyfish storage tank 2 Jellyfish crushing means 3 Coagulation separation tank 4 Filter 5 Activated carbon tower 6 Dehydrator 7 Foam solidification tank

Claims (4)

Crushing jellyfish into crushed material-containing water;
Adding alum and oxidizing agent to the crushed material-containing water;
Next, a step of adding an aggregating agent and subjecting it to an aggregation separation process
Processing method of jellyfish, characterized in that it comprises a purification step of purifying separated water obtained by the coagulation and separation process. The jellyfish processing method according to claim 1, wherein after adding the alum, a step of separating the foam is performed before the aggregating and separating step. 3. The jellyfish according to claim 1 or 2, wherein the purification step is a step of filtering the separated water obtained by the coagulation separation treatment and purifying the obtained filtered treatment water by treating with activated carbon. Processing method. The jellyfish treatment according to any one of claims 1 to 3, wherein the oxidizing agent is a chlorine-based oxidizing agent such as hypochlorite or perchlorate, hydrogen peroxide, or gaseous oxygen. Method.

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