KR200251919Y1 - Purification equipment of Lakes and Marshes for the water quality Using Bio-film - Google Patents

Abstract

The present invention relates to a lake water purification device using a biofilm, and is targeted to small and medium-sized lakes, that is, small lakes, ponds, and dams in national parks where water is stagnant and needs water treatment. In the constitution of the present invention, the contaminated water 31 of the lake is temporarily stored in the inflow tank 32 and transferred to the aerobic biofilm reaction tank 33 by a pump to remove the algae nutrient microorganisms, suspended solids, organic matter and Kjeldahl nitrogen. It is discharged through the treatment tank (34), and during backwashing, the backwash water is transferred to the sand dry bed (35) to filter out suspended matter, green algae and surplus sludge such as natural oil, and then the water is introduced into the inlet tank (31). Send it to treat it, dry the contaminants and spread the soil on the grass. The characteristics of lake water are lower than that of general sewage water, but it requires water treatment due to eutrophication, but it is not easy to apply water treatment methods and devices. However, biofilm reactors can obtain stable water quality, creating a clear and pleasant atmosphere for parks and ponds in each region that are used as a place for citizens to rest.

Description

Purification equipment of Lakes and Marshes for the water quality Using Bio-film}

The present invention relates to an apparatus for purifying lake water quality using a biofilm, and more particularly, to a water treatment of small and medium sized lakes in poor nutrition using a plug-flow type biofilm medium.

There are now eco-friendly small and medium-sized ponds and lakes around large cities and parks. Most of them supply water or groundwater to provide space for fish to live. However, appeals, once contaminated, cause the algae to multiply, kill fish, cause odors, and be disgusted by disgusted residents looking for a resting place. At present, in order to prevent this, it is necessary to dilute pollution by supplying new water to existing lake water, or to install water treatment facilities to purify water quality. Referring to the current water treatment method, the water treatment plant producing tap water is supplied to each home through the chemical treatment, that is, removing suspended solids through coagulation, filter, activated carbon adsorption process and disinfection. Even in the case of small and medium sized appeal water, if it is treated by the conventional method as described above, it takes a lot of maintenance cost, and it is difficult to apply a large amount of sludge generation. In addition, the sludge sludge method in the sewage water treatment method is difficult to apply when the pollution degree is low, such as the appeal water is difficult to apply. Let's look at the typical water treatment method applicable to the polluted lake water as shown in the drawing.

Figure 1 shows a water treatment system diagram by the appeal treatment method according to the prior art.

In detail, the process of eutrophication is carried to the inlet tank by pump, and then the suspended matter is removed by the filtration unit and discharged to the effluent. When the filtration resistance of the filtration unit is generated, the backwash water is transferred to the inlet tank. The treated water only removes suspended solids, and if excess algae breed in the filter, the sand packed in the filter must be replaced. In addition, this treatment method is a temporary treatment method, it is difficult to solve the fundamental eutrophication.

2 is a water treatment flow diagram by another physicochemical treatment method according to the prior art. The treatment form is the same as that of FIG. 1, but is replaced by a chemical treatment process instead of a filter. The detailed treatment form is to inject aluminum sulfate, iron salt, etc., inject an anionic polymer, form a floc by stirring, and then sedimentally separate and discharge into an appeal. This treatment method can remove phosphorus and suspended solids, but it is not easy to apply practically because contaminants such as dissolved organic matter and nitrogen are not removed well. Ammonia nitrogen dissolved in lake water reacts with dissolved oxygen in water and is converted to nitrate nitrogen, which causes the fish inhabiting the lake to take away dissolved oxygen to breathe. Looking at the existing prior art filed in Korea according to the Republic of Korea Patent No. 1989-0004193, because the conical type biofilm process as a single reaction tank to purify the inflow water while the filter material in the air lift pipe at the same time because the desorption of suspended solids Due to this, good water quality cannot be obtained, and since the hollow fiber membrane of the conical shape is used, suspended substances, etc., are clogged and an excessive amount of backwashing water is required. This treatment method is mainly related to the system for treating high concentration sewage water, and there is no mention of treatment result for poor nutrition condition, and it is difficult to maintain more than necessary air use. In addition, in the case of Korean Patent No. 1994-0006405, a medium having a different size and porosity was used in the reaction tank, but when backwashing the two-layered filter bed, the backwashing quantity was required a lot, and it was difficult to obtain excellent treated water quality and poor nutrition status. There is no mention of. In the case of Korean Patent No. 0245775, a wastewater treatment using a closed parallel biofilm is provided with a treatment tank for backwashing through a biofilm and a separate backwash water storage tank. There is no mention of appeal processing.

More detailed information on the biofilm reactor is described in detail in the present applicant's prior patent application Nos. 99-13133 and Published 99-068787, and the above description constitutes a part of the present invention. The present invention is a water treatment method suitable for the treatment of empty nutritious lake water, and the system is simple without internal transfer, so it is easy for non-experts to manage, it is cheap to maintain, requires less land, and the sludge generated by small lake water treatment is very small. It is intended to provide a purification device for easy treatment and to obtain highly treated water despite poor nutrition.

1 is a water treatment system diagram by an appealing treatment method according to the prior art,

Figure 2 is a water treatment system diagram by another physicochemical treatment method according to the prior art

3 is a schematic diagram illustrating a water treatment system according to an embodiment of the present invention.

Explanation of the sign

31: lake water, 32: inflow tank, 33: biofilm reactor,

34: treatment water tank, 35: sand drying table

In order to achieve the above object, the present invention is composed of the discharge into the inlet water tank 32, the aerobic biofilm reaction tank 33, the treated water tank 34 and the lake 31 to temporarily store the lake water 31, biofilm process Due to the nature of the filtration resistance, automatic backwashing proceeds by the water gauge, and the resulting backwash water flows to the natural drying in the sand-drying bed (35) to collect the suspended matter and algae accumulated in the upper sand at regular intervals, and the filtered filtrate It is possible to continuously purify by mixing in the inlet tank 32 again.

The inside of the biofilm reactor 33 is filled with a hydrophilic filter medium and various microorganisms inhabit the hydrophilic carrier, the organic matter is removed at the upper part and the nitrification reaction is carried out at the lower part. Maintenance cost is very cheap. In addition, the treatment of phosphorus is partly removed by the metabolic activity of the microorganisms.

Hereinafter, the present invention will be described in more detail with reference to specific examples and comparative examples.

(Example)

Using the water treatment system according to the present invention shown in Figure 3 treated the pond water in the park during the eutrophication.

The pond water 31 was transferred to the inflow water tank 32 and discharged into the biofilm reaction tank 33, the treatment water tank 34, and the pond 31 by a pump, and was treated to 50 m 3 / day. At this time, the lower part of the biofilm reactor 33 was injected with appropriate air into the diffuser using an aeration blower. When the water level of the biofilm reactor 33 was increased, automatic backwashing was performed by a water gauge, and the backwash water was sand-dried. The natural water at (35) is filtered water is injected into the inlet tank (32).

The specification of each unit process is 2.0m in length of inflow water tank (32), effective height of 2.5m, biofilm reaction tank (33) 1.5m in width of 1.0m, and effective height of 3.5m, gravel support layer 250mm, hydrophilic filter media 2.0m , The water treatment tank (34) width 1.0m length 1.5m effective height 2.5m, sand-drying phase (35) effective diameter 0.5m effective height 1.0m was manufactured.

In order to minimize the initial operating time required for stabilization of the treatment, the aerobic tank was infused with activated sludge at a concentration of MLSS 2000 mg / l from a nearby sewage treatment plant for three consecutive days at a rate of one-fifth of the inflow of raw water. The residence time was 0.8 hours. The experiments were carried out for 8 weeks using the system of the present invention, and the average processing performance of the 7 weeks when the steady state was reached is shown in Table 1.

(Comparative Example 1)

In order to compare the water treatment system and the water treatment performance according to the present invention used in the embodiment, the experiment was performed using a water treatment facility by physical treatment as shown in FIG. Instead of the biofilm filtration tank 33 of the embodiment was used as a filter 13 after replacing the sand of the sand dry phase 35 used in the example, the processing procedure is the same as the example. The experiment was conducted for 7 days, and the results are summarized in Table 1.

(Comparative Example 2)

For comparison with the embodiment, instead of the biofilm filtration tank 33, a chemical treatment process 23 is used as shown in FIG. 2, and the treatment sequence is the same. The chemical treatment process consists of rapid stirring, slow stirring and sedimentation, and as a specification, rapid stirring, 0.3m length 0.3m effective height 0.7m residence time 3 minutes, stirring at 180rpm, slow stirring 0.5m length 0.7m residence time 9 Stirred at 30 rpm for 30 minutes, and settled in a pyramid-shaped pyramid of 0.9 m vertical height 1.5 m precipitation time 30 minutes, made of PVC. Chemicals used in the process were injected with 50 mg / L of aluminum sulfate in rapid stirring and 0.5 mg / L of anionic polymer in slow stirring, followed by solid-liquid separation from the precipitate to discharge the treated water into the pond. The experiment was carried out for 7 days, and other conditions were the same as in the examples.

<Table 1> Experimental Results of Examples and Comparative Examples

The water treatment system according to the present invention has excellent treatment water quality such as BOD, TKN, NH ₄ -N, and turbidity, although the residence time of the biofilm reactor 33, which is the core technology of the embodiment, is short. In addition, it can be used semi-permanently by using a hydrophilic media, there is no separate chemical supply, no need for the internal conveying process and the final settling tank, it is possible to reduce the installation area, reduce the operating cost and miniaturize the device.

Claims (2)

In order to prevent eutrophication of small and medium-sized lakes and to obtain highly treated water quality, the aerobic biofilm reactor consisting of hydrophilic media after temporarily storing the lake water as an inflow water tank removes organic matter at the upper part and nitrification at the lower part by the ratio of organic matter and ammonia nitrogen. It is carried out in the area, the Kjeldahl nitrogen is removed by various microorganisms, some phosphorus is removed by microbial synthesis and metabolism, discharged to the lake through the treatment tank, and the backwash water is filtered through the sand dryer. Passed water is a lake water purification device using a biofilm, characterized in that the natural inflow into the inlet tank. The method of claim 1, If the size of the appeal is large, inlet water tank, biofilm reaction tank, treated water tank and sand dry phase in order to parallel combination of water purification apparatus using a biofilm, characterized in that possible.