JPH034988A - Water and bottom purifying material - Google Patents

Abstract

PURPOSE:To obtain the materials for purifying water and bottom as a countermeasure against a green and a red tide by using the particulate solids of steel manufacture slug as main component. CONSTITUTION:Since the particulate solids of steel manufacture slug are sandy, they are effective in covering the bottom mud. The activity of sulfuric acid reducing bacteria (which chemically convert sulfide ions into the sulfur and hydrogen sulfide responsible for the occurrence of a green tide) is controlled by the dissolving out of CaO contained in the slug. H2S in the water is stabilized by the CaO and Fe2O3 content. PO4<3-> in the water is stabilized by the CaO content. Ca5(PO4)3 (apatite) resulting from reaction is present in the slug and more effective in adsorption than the lime content alone. The stabilization of phosphorus content is effective in preventing eutroplication responsible for the occurrence of a green and a red tide.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is a water quality/sediment purification material, particularly a blue tide of sea areas, lakes and marshes,
This relates to water quality and bottom sediment purification materials used for red tide countermeasures.

[Conventional technology] In the conventional technology, lime was used as a method of using chemicals as one of the countermeasures to prevent contamination of water quality and bottom sediment due to blue tide and red tide in sea areas, lakes and marshes2.
Types of lime include limestone, quicklime, and slaked lime, but limestone has disadvantages such as soluble and non-stick, quicklime reacts with water and is dangerous, and slaked lime pollutes lake water and seawater. Ta.

For this reason, granular slaked lime obtained by granulating slaked lime has been proposed.

[Problems to be Solved by the Invention] However, the granular slaked lime is expensive, and it is necessary to mix iron oxide in order to fix hydrogen sulfide, which is the cause of blue tide, as iron sulfide. The present invention solves the above problems and proposes a water and bottom sediment purification material that is an effective measure against blue tide and red tide. Its purpose is to

[Means for Solving the Problems] The water/sediment purifying material according to the present invention is a water/sediment purifying material containing granulated steelmaking slag as a main component.

[Function] Since the main component of the water/sediment purification material of the present invention is granulated steelmaking slag, when it is administered into sea areas, lakes, and marshes, it has the following effects.

■Since the granules of steelmaking slag are sand-like, it has the effect of covering the bottom mud (in the case of lime, it is necessary to administer mountain sand as a bottom mud covering material).

■The activity of sulfate-reducing bacteria (sulfuric acid-reducing bacteria that chemically converts sulfide ions into sulfur and hydrogen sulfide, which causes blue tide) is suppressed by elution of CaO contained in steelmaking slag. At this time, the pH required to suppress activity is 8.5 or more, but in the case of steelmaking slag, it is kept at 8.5 or more and 9.0 or less (in the case of lime, the pH is 10 or more, and the water quality deteriorates. do).

■H2S in water is fixed by CaO and Fe20z.

■ Fixed P O4S- in water by CaO content0
As a result of the reaction, Ca s(P Oah (apatite)
However, since apatite exists in steelmaking slag,
Fixing phosphorus, which has a greater adsorption effect than lime alone, is effective in preventing eutrophication, which is the cause of blue tide and red tide.

[Example] FIG. 1 is an explanatory diagram showing an example of the present invention. Bottom mud (
(collected from the seabed) is gently filled with seawater that has been aerated with nitrogen gas, maintained in an anaerobic state, and left for several days.
H2S was generated. This seawater 1 was divided into 2.20 250m glass bottles, each used as an experimental group, the prescribed additive 3 was added, and the temperature was kept at 24°C in an incubator (not shown) and magnetically heated in the dark. Stirrer 4
The water was then gently agitated using the stirrer 5, and changes in water quality were measured after a certain period of time had elapsed. An accelerated test was conducted simulating setting up an experimental area in a body of water.

Table 1 shows the experimental conditions for each.

Table 1 (A section, B section; Invention example, Target section: Comparative example) The type of additive is converter slag, and its components are shown in Table 2. The zero particle size is about 11.

Table 2 (%) [Effect of the invention 1 As described above, according to the present invention, by using steelmaking slag as a water and bottom sediment purification material, it is possible to conserve the environment and avoid loss of fish catches. be.

FIG. 2 is a graph showing changes in pH over time.

The pH of the plants in Ward A and Ward B is stable in the range of 8.5 to 9.0, but in the target area, the pH is 8.0 or lower. In the comparative plot (200 g/loz of lime added), the pH increased to 10. Figure 3 shows H, S
It is a graph showing the change over time. For Wards A and B, it becomes almost 0 after 5 days, but there is almost no change in the target wards.
FIG. 4 is a graph showing the change over time of Fe4-P (phosphorus in the form of PO4). For A and B wards, 5
After a few days, it becomes almost O, but there is almost no change in the target area.From these experimental results, it is clear that by administering converter slag into water, the occurrence of blue tide and red tide can be suppressed.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing one embodiment of the present invention, Figure 2 is a pH
3 is a graph showing the change over time of H2S, and FIG. 4 is a graph showing the change over time of Fe4P. 1...Seawater, 2...Glass bottle, 3...Additive material, 4
...Magnetic Star, 5...Yinbanko.

Claims (1)

[Claims] A water and bottom sediment purification material characterized by containing granulated steelmaking slag as a main component.