KR100387299B1 - A sewerage system steel slag utilized - Google Patents

Abstract

The present invention relates to a sewage treatment apparatus using steel slag that is naturally purified in a waterway using slag generated during the production of steel as a filter medium.

The present invention is a sewage treatment apparatus which introduces the concept of water purification method based on biological treatment depending on the ecosystem in the waterway, and recycles steel slag as a contact medium to enhance the self-cleaning action in the waterway. The cover was covered with a cover on the waterway to maximize microorganisms for maximum composition and self-cleaning, and a cover was formed. An air supply device for periodically supplying compressed air is installed to activate the activity of aerobic microorganisms.

Therefore, the present invention provides an environmentally friendly purification apparatus by recycling steelmaking slag that has been disposed of instead of expensive ceramic media as media, and has an effect of drastically reducing the waste treatment cost and the equipment cost of the purification apparatus.

Description

Sewage treatment system using steel slag {A sewerage system steel slag utilized}

The present invention relates to a sewage treatment apparatus, and more particularly, to a sewage treatment apparatus using steel slag which is naturally purified in a waterway using slag generated during production of steel as a filter medium.

As the industry develops day by day, environmental problems are becoming very serious.

Since industrial waste generated in all fields itself contains raw materials and contains energy, it directly affects the cost of products such as recycling value as well as environmental problems at the time of disposal. At the source, there is a method of minimizing the generation of waste and a method of properly treating and recycling the discharged waste, and the research is being actively conducted.

The most representative wastes in the iron industry are slag, which can be roughly divided into blast furnace slag and steelmaking slag. Among them, blast furnace slag is produced during the process of manufacturing pig iron from iron ore at high temperature and is used as cement raw material. Steelmaking slag is produced during the process of manufacturing steel by refining pig iron in a converter and removing impurities such as carbon, phosphorus, and sulfur.The composition of slag is not constant according to various steel grades. It cannot be widely used as an auxiliary raw material for construction, and is used as aggregate or rubble for construction.

However, the steel slag is only part of a large amount of recycling is recycled, and the future prospects of the steel industry is expected to increase more and more unless the production method of steel is innovatively developed. Therefore, it is not only difficult to deal with the present, but also has a lot of influence on environmental pollution and cost increase, and further research on its recycling method will be needed.

On the other hand, various wastewaters generated from general households, livestock farms, and industrial complexes, besides solid wastes such as steelmaking slag, seriously pollute the rivers, and all costs and social efforts to purify the contaminated water with water are currently used in all industries. It is a factor that directly affects cost.

Currently, Korea is unable to properly manage the inflow of pollutants into drinking water sources and large rivers, and most of them are in eutrophic and mid-nutrition conditions, which are getting worse over time. Pollutants flow into drinking water sources and large rivers. There is a great need to improve the water quality by purifying it before it is made.

For this purpose, a biological treatment method having low chemical consumption and low operating cost during the wastewater treatment process is advantageous, and porous ceramic media may be used as a growth center for microorganisms. Porous ceramic media has a high surface area and pore volume, so it is excellent for microbial adhesion growth and is not affected by bacteria, solution type, pH, temperature, etc. Therefore, it is possible to reduce the wastewater treatment site by increasing biodegradable treatment efficiency and maintaining a high microbial growth rate, and it will be enormously costly to apply ceramic media to rivers or streams for this purpose. In addition, when using natural aggregates, etc. as a substitute material there is a problem that causes another environmental destruction where the aggregates are collected.

The present invention has been made in view of the above problems, and a sewage treatment apparatus using steel slag which can improve the water quality by purifying sewage using slag generated as a by-product in a steel manufacturing process as a media for biological wastewater treatment. The purpose is to provide.

In order to achieve the above object, the present invention provides a device for purifying sewage, comprising: a channel formed by connecting a plurality of bench-type plume pipes of which an upper portion is opened so that sewage is drained into the inside; The air supply pipe is formed to extend along one side wall of the waterway, and one end extends to the middle point of the bottom surface through the side wall, as one branch branches at equally spaced positions of about 50 cm to 1 m along the longitudinal direction of the air supply pipe. An air supply device including an air distribution pipe formed, and a blower formed at an end of the air distribution pipe and blowing air supplied through the air supply pipe and the air distribution pipe into the water channel; From the bottom of the channel, blast furnace slag with a diameter of 70 to 100 mm, steelmaking slag with a diameter of 70 to 100 mm and other steel slag with a diameter of 13 to 40 mm are filled to the upper side at a height ratio of 40%, 30% and 30%, respectively. A filter section made to purify the sewage drained through this; It is installed in the middle of the channel at equal intervals along the beginning and the longitudinal direction of the channel, and controls the flow rate of sewage in the overflow method, and the bottom part acts as a manhole to accumulate the suspended solids purified by the filter media in the channel. A known flow rate adjusting tank; A cover for forming a plurality of holes to allow ventilation and inflow of rainwater into the waterway and covering the open upper side of the waterway; It is characterized by consisting of a cover made of topsoil covered on the cover and drinking water planted in the topsoil.

The present invention having the above configuration provides an environmentally friendly purification device by recycling steelmaking slag that has been disposed of as a filter instead of expensive ceramic media, and has an effect of significantly reducing the disposal cost of waste and the installation cost of the purification device. .

1 is a partial cutaway perspective view showing the water channel and the air supply device

Figure 2 is a partial cutaway perspective view showing the filter medium is filled and the cover is closed

Figure 3 is a cross-sectional view of a preferred embodiment of the sewage treatment apparatus using steel slag according to the present invention

Explanation of symbols on the main parts of the drawings

10: channel 20: air supply device

21: air supply pipe 22: air distribution pipe

23: blower 30: the woman

31: blast furnace slag 32, 33: steelmaking slag

40: cover 41: hole

50: cover part 51: topsoil

52: drinking water

Detailed features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

Figure 1 is a partial cutaway perspective view showing the appearance of the water channel and the air supply device, Figure 2 is a partial cutaway perspective view showing the cover is filled with the filter medium, Figure 3 is a sewage treatment apparatus using a steel slag according to the present invention Is a cross-sectional view of a preferred embodiment.

The present invention introduces the concept of water purification method based on biological treatment depending on the ecosystem in the waterway as shown, and uses steel slag as a contact medium to enhance the self-cleaning action in the waterway (10). The cover part 50 is formed on the channel 10 for activation of aerobic microorganisms and random microorganisms for the creation of a friendly environment and for maximizing the self-cleaning action. The air supply periodically supplies compressed air to the inside of the channel 10. When the device 20 is installed, its detailed configuration is as follows.

First, the channel 10 is formed by connecting a plurality of bench-type plume pipe with an open top as shown in FIG. 1, and the sewage is drained into the inside thereof, and the overall length of the channel 10 is generally 150 m to 250 m. Sewage can be purified. And for smooth drainage of the sewage it is desirable to form a gradient of about 1% to 2% over the entire length of the waterway (10).

In the channel 10, as shown in FIG. 1, an air supply device 20 is installed to periodically blow compressed air into the sewage drained into the channel 10. That is, one end of the air distribution pipe 22 is branched at equal intervals of about 50 cm to 1 m along the longitudinal direction of the air supply pipe 21 arranged long along one side wall of the water channel 10. As a result, it extends in a state of being in close contact with the intermediate point of the bottom surface via the side wall of the channel 10. The blower 23 which spouts compressed air finely and blows out a large area is formed at the end of the elongated air distribution pipe 22. Although not shown, a compressed air generator (not shown) is installed at an end of the air supply pipe 21 to generate compressed air periodically, and then blows through the air supply pipe 21 and the air distribution pipe 22. Through 23, the compressed air is injected into the sewage in the water channel 10.

The compressed air periodically injected into the water channel 10 prevents the anaerobicization of the slag at the lower end of the flue tube, and prevents the closing of the pores between the slag particles, thereby serving to facilitate the flow of sewage. In addition, the effect of forced injection of oxygen into the sewage naturally occurs to prevent eutrophication due to the lack of dissolved oxygen and to activate the microorganisms to increase the natural purification capacity of the channel.

Also, as shown in FIG. 2, the blast furnace slag 31 and the steelmaking slag 32 and 33 are sequentially filled in the water channel 10 provided with the air supply device 20 to form the filter portion 30. The blast furnace slag 31 and the 70 ~ 100mm diameter steelmaking slag 32 and the other steelmaking slag 33 and 13 ~ 40mm diameter size is filled from the bottom surface of the channel 10, It is filled to the upper side at the height ratio of 40%, 30% and 30%, respectively, and the sewage drained through this is naturally purified.

In general, steel slag contains MgO, FeO, Fe ₂ O ₃ , MnO, etc., mainly composed of CaO and SiO ₂ , and has a specific gravity smaller than that of ferrous metals and is porous like basalt. In particular, steelmaking slag (32, 33) has a high pH can buffer the pH of the waste water, and the heavy metal removal effect is also reported to be excellent, CaO of the steel slag component has a dephosphorization effect to replace the ceramic media Can be used as an excellent alternative media The present invention uses steel slag as a media for biological wastewater treatment. These steel slugs have characteristics as microbial attachment media for biological wastewater treatment, characteristics as filter media for physical and mechanical filtration of suspended solids, and crystallites for phosphorus removal by chemical reaction.

On the other hand, although not shown, it is preferable to install a known flow control tank (not shown) in the middle of the waterway 10 at equal intervals along the beginning and the longitudinal direction. The flow regulating tank regulates the flow rate of the sewage in an overflow manner, and serves as a manhole for accumulating the suspended solids purified by the filter unit 30 in the water channel 10 at the bottom thereof. If a large amount of suspended solids accumulated in such a flow control tank and regularly cleaned, the ability to remove the suspended solids in the waterway 10 can be further increased. The capacity of the flow rate adjustment tank installed in this way is preferably about 6 hours based on the maximum amount of sewage per hour.

And the upper portion of the channel 10 filled with the filter medium 30 is covered with a cover 40, the cover 40 is preferably composed of a plate made of a plastic material of polyethylene (polyethylene) resin, 10) A plurality of holes 41 are formed to allow ventilation and inflow of rainwater into the interior.

In addition, the topsoil 51 is covered on the upper side of the cover 40 covered on the top of the waterway 10, and a small drinking water 52 such as forsythia is planted on the topsoil 51 on the covered topsoil. . Soil covering the topsoil 51 and planting drinking water 52 is also intended to create an environment-friendly beautiful environment, but by activating the activity of microorganisms in the topsoil 51, purifying the nature in the lower channel 10 To cultivate the ability, and in the winter to try to activate the microorganism through a kind of warming action.

The sewage treatment apparatus using the steel slag according to the present invention constituted as described above, while the wastewater including the sewage introduced into the flow control tank is introduced into the waterway 10 at a constant flow rate, the filter part filled in the waterway 10 is filled. It is purged as follows while being drained through the gap between the blast furnace slag 31 and the steelmaking slab (30).

First, the floating material floating and moving in the sewage is absorbed on the surface of the steel slag constituting the filter unit 30 or is caught by a small projection on the rough surface to stop kinetic energy. That is, suspended solids are almost eliminated primarily through physical adsorption or mechanical filtration.

Thus, the amount of suspended solids accumulated in the filter medium 30 is very large, which is not an amount that can be easily removed even when the ecosystems of micro-animals and aquatic organisms are formed. Therefore, it is very important to prevent this from blocking the gap of the filter medium 30. For this purpose, it is preferable to periodically clean the blown air through the air supply device 20, which is accumulated in the bottom portion of the flow control tank while being drained. Compressed air also serves to cultivate natural purification ability by activating aerobic microorganisms by increasing the amount of dissolved oxygen in sewage as described above.

In general, sewage and wastewater are often acidic, but the sewage purified through the filter medium 30 is neutralized by increasing the pH slightly because the steel slag is alkaline, which causes the CaO component contained in the steel slag to react with water. This is because Ca ²⁺ and OH ⁻ are formed.

The CaO component of the steel slag reacts with phosphorus. The phosphorus component is removed from the sewage by precipitation of hydroxyapatite (Ca ₁₀ (OH) ₂ (PO ₄ ) ₆ ) crystals through the crystallization process. It will be purified.

Meanwhile, the cover part 50 formed on the channel 10 prevents the temperature of the channel 10 from dropping even in winter so as to prevent deterioration of activities of aerobic and random microorganisms, thereby exhibiting a constant purifying ability in all seasons. Done. And the drinking water 52 planted in the topsoil 51 activates the activity of the microorganisms in the topsoil 51 to incubate the natural purification ability in the waterway 10 formed on the lower side of the cover 40. do.

Therefore, the sewage treatment apparatus using the steel slag according to the present invention as described above, since the contaminants in the sewage are decomposed together by the active activity of the aerobic microorganisms as well as the physical and chemical action of the filter medium 30, using the steel slag of the present invention The sewage through the sewage treatment system has no harmful effects on the natural ecosystem as it is discharged into large rivers after harmful substances are purified and biochemical oxygen demand (BOD) and chemical oxygen demand (COD) are significantly reduced.

Therefore, the sewage treatment apparatus using the steel slag of the present invention can reduce the enormous treatment cost required for the disposal of the waste by recycling the steel slag that was disposed of as a filter instead of expensive ceramic media, and invested for the facilities of the sewage treatment facility. In addition, there is an economic usefulness that can be greatly reduced, and there is no fear of environmental pollution due to disposal, thereby providing an environment-friendly purification device.

The sewage treatment apparatus using the steel slag according to the present invention has a chemical purification capability such as neutralizing acidic sewage naturally by the characteristics of the steel slag used as a medium and removing phosphorus by crystallization. Very good, good adsorption of suspended solids, physical and mechanical removal effect is excellent.

In addition, the sewage treatment apparatus using the steel slag of the present invention, because the topsoil is covered to the upper side of the sewage to be drained, it exhibits a warming effect even in winter, so that the activity of microorganisms is not significantly reduced, it is possible to maintain a constant purifying ability of all seasons, Since drinking water such as forsythia is planted above, the activity of microorganisms in the topsoil becomes active, thereby cultivating the natural purification ability in the lower channel, and on the other hand, it has a useful effect to make the surrounding environment beautiful.

Claims (1)

In the apparatus for purifying sewage, A water channel 10 formed to connect a plurality of bench-type plum pipes of which the upper part is open so as to drain the sewage into the inside; The air supply pipe 21 is disposed long along one side wall of the water channel 10, and the side walls of the air supply pipe 21 are branched at equal intervals of about 50 cm to 1 m along the longitudinal direction of the air supply pipe 21, respectively. Air distribution pipe 22 which extends to the middle point of the bottom surface via the air, and is formed at the end of the air distribution pipe 22 and supplied via the air supply pipe 21 and the air distribution pipe 22 An air supply device 20 formed of a blower 23 for flushing the water into the waterway 10; From the bottom surface of the channel 10, the blast furnace slag 31 having a diameter of 70 to 100 mm, the steel slag 32 having a diameter of 70 to 100 mm, and the other steelmaking slag 33 having a diameter of 13 to 40 mm are respectively 40% and 30. A filtering part 30 configured to naturally clean the sewage drained through the filling by the upper side at a height ratio of% and 30%; A cover 40 having a plurality of holes 41 formed therein to allow ventilation and inflow of rainwater into the waterway 10 and covering the open upper side of the waterway 10; Sewage treatment apparatus using a steel slag, characterized in that consisting of a cover 50 made of topsoil (51) covered on the top of the cover 40 and drinking water 52 planted in the topsoil (51).