JPS5864174A - Treatment of jellyfish - Google Patents

Abstract

PURPOSE:To change the organic substance of jellyfish into a soluble state and to substantially annihilate them in the end, by treating the jellyfish in the presence of free oxygen at a specified temperature range for a proper time under pressure enough to maintain a liquid phase. CONSTITUTION:Jellyfish are treated in the presence of free oxygen at a temperature of 150-300 deg.C under pressure enough to maintain a liquid phase by a catalyst or without a catalyst for a proper time (e.g. 0.2-2hr), to change the organic substance of the jellyfish into a soluble state and to substantially annihilate them in the end. An amount of oxygen necessary for the decomposition is preferably above at least a value equivalent to the TOD substance constituting the jellyfish to obtain a more complete decomposition rate. When a catalyst is used, the one which exists as a copper or copper complex ion in the reaction system is preferably used, and the necessary addition amount of the copper catalyst is prefferably about 100-1,000ppm as Cu<++> ion. The concentration, separation and cyclic reuse of dissolved cupric ion can be performed by slightly adjustment of the Cu<++> ion in the waste water and then treating it with weakly acidic cation exchange resin.

Description

[Detailed description of the invention] It is about how to process and eliminate Kaigetsu in large quantities.

Kaigetsu is also written as water mother, and mainly refers to the free-swimming sexual generation of the Coelenterata and the class Medusa, but it is also a general term that includes animals from 2 to 5 other classifications that have similar appearances. There are some jellyfish that are edible such as Bizen Jellyfish and Echizen Jellyfish, but they sometimes occur in large numbers and break fishing nets, and the toxins of the nematocysts, commonly known as electric jellyfish, are so strong that the temperature of the seawater increases. Some are harmful, such as the feared bonito snail. One of the harmful effects of sea moons that has recently attracted particular attention is the harm caused by sea moons that gather at the water intakes of nuclear power plants or thermal power plants.

Power plants that use the large-capacity boilers mentioned above use large amounts of cooling water in condensers, etc., and then discharge hot water.

In Japan, most boiler-type power plants are built in coastal areas for the convenience of cooling water intake, and they take in large quantities of seawater as cooling water and return it to the sea as heated wastewater. However, a serious problem arose. In other words, a large amount of water sometimes collects in the water intakes that are important for these power plants, making it difficult to take in water, and what is inhaled contaminates the transmission surface of the heat exchanger and reduces its capacity, making it almost impossible to function. It also causes such harm that it is forced to stop. Although the cause of the abnormal occurrence of Kaigetsu is said to be unknown, it is a particularly serious problem as abnormal occurrences of Kaigetsu are often seen during the summer power peak, and it is being closely focused on as a common problem in the electric power industry. . As a countermeasure, we put a net around the water intake to prevent them from entering, but on busy days, large swarms of hundreds of tons come rushing in from behind, so if we don't rake them up and remove them, we don't have to put the nets in. It becomes a useless thing. However, the problem lies in what to do with this raised seaweed. As is often experienced when swimming in the sea, Kaigetsu has a good water retention capacity and does not dehydrate easily despite its appearance, and whether it is thermally dehydrated or incinerated, Kaigetsu loses 95 to 98 inches of its body weight. is said to consist of water, so when handling it,
It is economically difficult.

Even though they are seafood, it is not permissible to dump large quantities of carcasses in coastal areas. The conventional method for this purpose was to accumulate the scraped up seaweed in a certain storage area to utilize its natural purifying power. If there was a large amount of waste collected, it would be difficult to store it, and a state of emergency in the city without power generation was inevitable.

The present invention provides a unique method to overcome the difficulties posed by the above problems.

Until now, Kaigetsu has been studied with interest from an embryological standpoint, but not much is known about its other chemical components. There is also a theory that it consists mainly of chitin. Chitin is a complex consisting of aminopolysaccharides and proteins, and is not only poorly soluble in various solvents, but is also said to be fairly inert chemically. When incinerated at low temperatures, it emits a foul odor, but not only does it result in a loss of energy equivalent to incinerating water, but if it is incinerated at high temperatures, amine groups generate more NO.
x is likely to occur. As a result of various studies on mass disposal methods for Kaigetsu, which are considered to be difficult to process, the present inventors found that the method is sufficient to maintain a liquid phase at a temperature of 150 to 600°C in the presence of free oxygen. It was discovered that by treating under a certain pressure for an appropriate period of time, the organic matter in the seaweed becomes solubilized and eventually almost disappears, leading to the present invention. A method of implementing the present invention will be described below.

Sea moons sometimes reach a diameter of 0.5 to 1 m, but the ones that are usually harmful are about 5 to 20 tYn. In any case, these seaweeds have a gel-like appearance, and if they are processed immediately, they tend to cause uneven reactions, and there are also problems in handling, so it is preferable to bring them into a peptized state.

In particular, when processing continuously, it is preferable to perform the processing in advance using a mixer-like device. During batch processing, high-speed stirring causes separation within the reactor relatively easily, but from the viewpoint of reaction speed, it is extremely effective to perform processing in advance using a high-speed stirring blade such as a mixer. By processing in this way, Kaigetsu becomes an emulsion containing some suspended solids, but this can be processed in its entirety without being separated. Before the reaction treatment, add 1! of this emulsion! # Keeping it compressed has a (j-effect) on downsizing the reactor.The reaction to annihilate Kaigetsu is carried out in the presence of free oxygen, but for this purpose air, pure Oxygen or oxygen-enriched air is preferably used.The amount of oxygen required for this decomposition is determined by the TO
It is preferable that the amount is at least equivalent to the amount of substance D. When the temperature is lower than that, a high degree of decomposition cannot be obtained due to lack of oxygen, and an increase in the dissolved amount of COD or BOD substances and the amount of malodorous substances in the gas phase or liquid phase due to incomplete decomposition is unavoidable.

A continuous amount of 1.5 to 2 equivalents is sufficient for a batch reaction, but there is no particular problem.When using a catalyst, copper ions or copper lead ions exist during the reaction. is suitably used. Even if metallic copper is used, its detergent effectiveness will be extremely high if it contains amino sugars or proteins that generate ammonia upon decomposition as its constituent components. manganese nickel,
Transition metals such as molybdenum can also be used as catalysts, but are less effective than copper. It is sufficient that the necessary amount of the copper catalyst added is about 100 to 1000 pI) m, preferably 200 to 600 ppm as CuF + ions. Even if the amount is more than k, the effect will not be particularly increased and the difficulty in treating wastewater will increase. Ions in wastewater are toxic to fish and are undesirable, but in the case of the Mokutsumugi invention, the pH of the wastewater after treatment is often around 4 to 6, so it can be used with little or no adjustment. After adjustment, the dissolved copper ions can be concentrated and separated by treatment with a weakly acidic cation exchange resin, and can be recycled and reused without any particular problem.

Sulfide-based copper phase metals and processing agents can also be used. The reaction temperature is usually in the range of 150 to 500°C,
The reaction increases rapidly from around 200°C. iso
If it is less than 'c, the reaction will be insufficient, and if it is more than 3o'c, there will be little benefit. Ushita retention time is usually 0.
2 to 2 hours, preferably 1 to 1.5 hours is sufficient.

Of course, the longer it is, the more complete the decomposition will be. The reaction pressure at this time requires oxygen partial pressure in addition to water vapor pressure, but it will be higher if air is used, and lower if pure acid purple is used. In the case of a batch method, it is usually sufficient to set the initial oxygen partial pressure to about 10 to 20 atm, but the degree of necessity for this oxygen partial pressure varies depending on the reaction method, conditions, etc., and even in a batch method, only gas If a flow type is used, it becomes possible to lower the reaction pressure. The reaction proceeds even without the use of a catalyst, which is advantageous in that post-treatment of the catalytic metal is not required; however, the reaction rate is generally rather slow and lower fatty acids tend to remain in the reaction solution. Such organic acid can be treated by the activated sludge method, but since there is not necessarily enough site area for power source locations, it is often better to treat it all at once using a catalyst. In addition, when a catalyst is not used, electrochemical treatment, comprehensive treatment using hydrogen peroxide, ozone, etc. can be easily carried out as a secondary treatment by taking advantage of the location of the power source.

By combining the above-mentioned decomposition conditions, it is possible to easily decompose more than 95% of the organic components of Kaigetsu in one treatment, and this invention can be said to be extremely useful industrially.

Example: In a 1.5-inch internal volume vertical stirring autoclave, Reve, was weighed and put the Kaigetsu treated with a mixer for 5 minutes, and the catalyst was heated under pressure with air or oxygen at a predetermined temperature and time. The decomposition reaction was carried out in the presence or absence. The results are shown in Table 1.

Table 1 Experimental results *d *(1*e *d $dSample 150 250 35 400
250 added water (me 250'150 365
0 150 Solid content concentration (2/β) 9.4
156s, s 25 15.6 Catalyst addition amount*
a 400 400 400 0 20
0*b*b *b *C*C EΔgax? 1kE(r'#aG) 49
so 4a 10 30 reaction degree ('0) 280 225 280 28
0 180 reaction time (mim) 90 9
0 90 90 150 decomposition liquid π)C (m death)
2 74 325 36 300 decomposed solution pH 4,34,76,6-- Note*a mg(u2+waste*b air *Coxygen*d water jellyfish (dry solid content 25%)*e commercially available edible water jellyfish (solid content 10%) Patent applicant Nippon Steel Kakoki Co., Ltd.

Claims (3)

[Claims] (1) A method for treating seaweed, which is characterized by treating seaweed in the presence of free oxygen, at a temperature of 150 to 500°C, under sufficient pressure to maintain a liquid phase, either without or with a catalyst. . (2) The method according to claim (1), in which the treatment of seaweed is carried out in the presence of a copper catalyst. (3) A method according to claim (1) or (2), characterized in that the sea moon is processed as a slurry.