JPS59173410A - Prevention of adherence of shellfish, seaweed and the like to waterway - Google Patents

Abstract

PURPOSE:To recover harmful copper ion by a method in which a copper or its alloy lining is applied to the inner walls of a waterway, and paired electrodes are set on the downstream side and connected to a DC power source for polarization in such a way as to cause copper ion to adhere to the cathode. CONSTITUTION:A soft steel plate 14 whose inside is provided with a copper lining 12 is laid in the longitudinal direction of a waterway on the inner wall of a concrete body 10. A metal 22 consisting of titanium and platinum and a soft iron metal net 24 are supported and fixed to the inside of the concrete body 20 by supporters 26A and 26B insulated. Copper is dissolved from the copper lining 12 into the sea water, the adherence of marine organisms, e.g., shellfish, etc., in the waterway to the inner walls of the waterway is thus prevented, and copper ion is presipitated onto the outer surface of the metal net 24. The adherence and growth of water organisms can thus be prevented and harmful copper ion can also be recovered to avoid pollutional problems.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for preventing aquatic organisms such as shellfish and algae from attaching and propagating in waterways by dissolving steel into water.

(Prior Art) Since copper is extremely harmful to living things, a copper compound is applied to the hull of a ship to prevent shellfish, seaweed, etc. from growing on the hull.

In addition, aquatic organisms such as shellfish grow in the intake channels of factories that use large amounts of water or seawater, narrowing the flow path area. At nuclear power plants, cooling capacity decreases.
It is necessary to prevent the propagation of marine organisms such as shellfish and seaweed.

Therefore, a method to prevent marine organisms from adhering and breeding in waterways by leaching copper into seawater is considered, but copper is extremely harmful to living things, and seawater containing large amounts of copper ions is poured into the sea. Continuing this process is not desirable in terms of pollution problems, and pitting corrosion may cause malfunctions in cooling pipes, pumps, and other equipment at power plants. Measures to prevent the propagation of marine organisms such as marine organisms are not being utilized.

Therefore, the current situation is that shellfish, seaweed, etc. that have adhered to the waterway are removed periodically, for example once a year, using tools, etc., and this work requires a lot of effort and time. - It was also difficult to dispose of shellfish, seaweed, and other marine organisms that had been peeled off.

(Objective of the Invention) The object of the present invention is to prevent aquatic organisms such as shellfish from adhering to waterways by dissolving steel into water, and to recover steel ions in water by electrodeposition means.

(Structure and operation of the invention) The present invention provides copper or steel alloy lining treatment to the inner periphery of the waterways of power plants or various factories that utilize large amounts of water or seawater, especially the intake waterways, so that copper can be submerged underwater. shellfish,
A direct current that kills seaweed and other aquatic organisms and places a pair of electrodes in the waterway downstream from the location where the steel or steel alloy lining treatment is applied, and these electrodes are provided outside! This is a method for preventing the adhesion of shellfish, algae, etc. in waterways, in which the copper ions present in the water are collected by being connected to the cathode and then polarized.

In the above configuration, each of the pair of electrodes is a metal body made of conductive metal, and the anode is made of titanium platinum, triiron tetroxide, lead silver, which is difficult to dissolve in seawater as metal ions.
It is preferable that the cathode be made of graphite or the like, while the cathode should be a metal body made of inexpensive soft iron, especially a metal body with holes so that a large amount of copper ions can adhere to it. The current density is preferably about 0.5 mA/rJ. This causes Mg'(OH), 2
, an inorganic compound mainly composed of CaCQ3 is deposited, but when the current density is 1 mhl- or higher, the amount of inorganic compound deposited on the cathode is large and the copper ion recovery efficiency is poor considering the power consumption. On the other hand, even if the current density is too low, steel ions cannot be recovered sufficiently, so 0.5fiA/! Preferably before and after.

(Example) Next, the present invention will be explained in detail.

In Figures 1 to 3, an intake channel 2 that takes in seawater,
In a waterway equipped with a drainage channel 4 that drains the seawater taken in from the intake channel 2 into the sea after being utilized for six days at the power plant, a 1 thickness by means of cladding, plating, etc.
A mild steel plate 14 treated with the copper lining 12 of w1 is laid across several grooves in the longitudinal direction of the waterway. On the other hand, inside the concrete frame 20 constituting the drain port 4A of the drain channel 4, a supporting member is provided with a metal body 22 made of titanium platinum and a wire mesh 24 made of soft iron on the bottom and side walls, respectively. It is supported and fixed by 26A and 26B.

The upper ends of the metal body 22 and the wire mesh 24 are connected to an external DC power source 28, and when energized, the metal body 22 becomes an anode and the wire mesh 24 becomes a cathode.

Note that the support members 26A and 26B are insulated, and no current will escape from them.

Approximately 20 μg of sawdust per day is leached into the seawater from the copper lining part 12 of the water intake 2A, and the seawater in the waterway contains copper ions. 4
Kill or weaken marine organisms such as shellfish in the waterway leading to A, and prevent them from adhering to the inner peripheral wall of the waterway.

On the other hand, at the water intake port 4A, electricity is applied between the metal body 22 and the wire mesh 24 to set the current density to 0.5 mA/-.

Then, copper ions (Cu'', ) in the seawater adhere to and precipitate on the outer surface of the wire mesh 24, which serves as a cathode.

In addition to copper ions, the wire mesh 24 contains CaCO3, Mg(OH
) Z and other inorganic substances also adhere, but the amount is not large as they are washed away by the water flow. In addition, in order to increase the amount of inorganic substances attached, people make the cross section of the drain port 4A small to increase the flow velocity and reduce the amount of inorganic substances attached.

In this example, a platinum titanium metal body that is difficult to dissolve into seawater during energization is used as an anode, but instead of this, a metal body of triiron tetroxide has the same effect, and a platinum titanium metal body is used as an anode. It is preferable to use a metal body of triiron tetroxide because it can be obtained at a lower price.

In this example, since a wire mesh was used for the cathode, the surface area of the cathode was increased, and a large amount of copper ions could be attached and collected. In addition, the wire mesh has many gaps, so even if it is placed perpendicular to the flow, it will not block the flow, and the supporting members 26A, 26
No excessive external force is applied to B.

According to this embodiment, the cross section of the waterway will not be pinched by adhesion of marine organisms such as shellfish and seawater.

Further, in the above embodiment, the inner circumferential wall of the water intake for two people is treated with copper lining, and a copper ion recovery means is provided in the water intake 4A, but a copper ion recovery means is provided at the downstream position 2B of the intake channel, and If the upstream of the drainage channel 4B is lined with copper or steel alloy, and the drainage outlet 4A is also provided with copper ion recovery means, it will be possible to prevent marine organisms such as shellfish from adhering to the waterway, and the power plant 6 Pitting corrosion will no longer occur in various devices, equipment, etc.

Although the above embodiment describes a method for preventing the adhesion of shellfish, etc. in a waterway that carries seawater, the present invention can also be applied to a waterway that carries fresh water instead of seawater.

(Effects) According to the present invention, the adhesion and propagation of aquatic organisms such as shellfish in waterways is prevented, and harmful copper ions used to prevent adhesion of aquatic organisms are recovered, so that no pollution problems occur. Nor.

[Brief explanation of drawings]

Figure 1 is a plan view of the power plant with intake and drainage channels;
The figure is a sectional view of an intake channel that has been subjected to copper lining treatment, and FIG. 3 is a sectional view of a drainage channel that is provided with copper ion recovery means. 2... Intake channel, 2A... Water intake, 4...
・Drainage channel. 4A...Drainage port, 10,20...Concrete frame. 12...Copper lining, 14...Mild steel plate. 22...Metal body as anode, 24...Wire mesh as cathode, 28...Direct #t, power source. Agent Tatsuyuki Unuma (and 1 other person)

Claims (2)

[Claims] (1) In a method of preventing shellfish, algae, etc. from adhering to waterways by eluting copper into water, the inner circumference of the waterway is lined with copper or copper alloy, and this steel or steel alloy lining treatment is used. A method for preventing the adhesion of shellfish, algae, etc. in a waterway, characterized by arranging a pair of electrodes downstream of the position where the . (2) The method for preventing adhesion of shellfish, algae, etc. in a waterway according to claim 1, wherein the anode is made of a wire mesh.