KR100770177B1 - A algal bloom treatment method in water treatment plant - Google Patents

Abstract

The present invention relates to a method for treating algae in a water treatment system, and more particularly, in a water treatment system in which purified water is passed through a sedimentation basin, a forced sedimentation tank, and a filter paper, in which chlorine is introduced to a front end of the settlement and a forced sedimentation cell. The present invention relates to a method for treating algae in a water treatment system, characterized by maintaining a sludge layer containing powdered activated carbon.

According to the algae treatment method of the present invention can be economically treated without secondary pollution, such as clogged filter sand by the algae and odor generation in a water purification plant that accepts forced sedimentation method.

Algae removal, purified water treatment, chlorine, activated carbon, forced sedimentation, sludge layer

Description

Algae BLOOM TREATMENT METHOD IN WATER TREATMENT PLANT

1 illustrates a method of applying the algae treatment method of the present invention to a water purification plant of an actual forced sedimentation type.

Figure 2 shows the algae treatment rate of Example 1 and Comparative Example 2 according to the present invention.

[TECHNICAL FIELD OF THE INVENTION]

The present invention relates to a method for treating algae in a water treatment system, and more particularly, in order to economically treat the clogged filter sand and odor generation caused by algae without secondary pollution, the raw water is sequentially settled, forced sedimentation tank and filter paper. In a water treatment system for passing, chlorine is introduced into the front of the settlement, and a sludge layer containing powdered activated carbon is maintained in the forced sedimentation system.

[Private Technology]                         

The whole chlorine is treated as a way to remove algae when they are reproduced in large quantities. But the whole chlorine treatment is not very effective. The reason for this is that the algae are killed by the introduction of whole chlorine and the cell wall is destroyed and the cytosol is eluted in water according to the species of the algae and breeding. have.

Another method for removing algae is the treatment of powdered activated carbon. However, the treatment of powdered activated carbon requires a large amount of activated carbon input, and thus, economical efficiency is low, and there is a problem that substantially does not solve the clogged filter sand.

In another method, all chlorine and powdered activated carbon may be simultaneously added, but in this case, the chlorine and the powdered activated carbon may react, resulting in an increase in chemical cost. The reason for this phenomenon is that in the case of general water treatment plant, the sedimentation basin takes the form of a rectangular inclined plate sedimentation basin or a naturally-flowing sedimentation basin, which does not secure contact time for all chlorine and powdered activated carbon to achieve their respective advantages. This is due to the amount of the input should be large because it is continuously precipitated in the battery and removed in the form of sludge.

In addition, Korean Patent Publication Nos. 2001-48831 and 2001-10801 are known technologies for removing algae from water purification plants. They disclose methods for removing algae using biofilm filtration and dissolved air flotation, respectively, but do not disclose the use of chlorine treatment or powdered activated carbon.

 The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a method capable of effectively removing algae regardless of breeding species in a water purification plant that accommodates forced sedimentation.

In addition, an object of the present invention is to provide a water treatment system that accommodates forced sedimentation method that can solve the clogged filter sand and odor generated by algae.

In order to achieve the above object, the present invention provides a purified water treatment system for sequentially passing the purified water through the settling paper, forced sedimentation tank and filter paper,

The present invention provides a method for treating algae in a water treatment system, in which chlorine is added to a front of a settlement and a sludge layer including powdered activated carbon is maintained in a forced settlement.

In another aspect, the present invention provides a water treatment system equipped with an algae treatment method.

Hereinafter, the present invention will be described in detail.

The present invention is characterized in that chlorine is introduced to the front end of the settlement and the sludge layer containing the powdered activated carbon is maintained in the forced settlement.

In the present invention, the input of chlorine is introduced at the front of the settling basin which is the portion of the purified water flowing into the water purification system. Algae are killed by the injected chlorine, and the injected chlorine reacts sufficiently in the sedimentation basin and is then passed to the forced settler. The chlorine is preferably added to the chlorine gas (Cl ₂ ), it is better to add a concentration of 0.7 to 1.5 ppm. When the concentration of the chlorine is less than 0.7 ppm, algae are not killed well, and when it exceeds 1.5 ppm, economic efficiency is low.

The purified water, which has reacted sufficiently with chlorine in the sediment, is passed on to the forced settler. In the forced precipitate in the present invention, a sludge blanket containing powdered activated carbon is formed in the sedimentation basin. The sludge layer is initially made by adding a large amount of powdered activated carbon.

The purified water flowing into the forced sediment is passed through the sludge layer from the bottom to the upper layer to remove the suspended matter in the water. In the present invention, the purified water is raised from the bottom to the upper layer in the forced sedimentation, thereby maintaining sufficient contact time with the powdered activated carbon. Preferably, the forced sedimentation is activated carbon contained in the sludge layer is moved to the lower portion of the forced sedimentation in the sludge layer as the suspended solids adsorbed, the activated carbon moved to the lower portion is removed, only as much activated carbon as the sludge layer Sludge circulating forced sediment that is put on the top is good. In the sludge circulation type forced sedimentation, the sludge layer formed in the sedimentation basin stays for a long time, and the activated powder activated carbon constitutes the sludge layer, so that the adsorption by the powder activated carbon starts after sufficient action of chlorine, thus interfering with each other between the powdered activated carbon and chlorine. There is no phenomenon.

In the present invention, the concentration of the powdered activated carbon in the sludge layer of the forced sedimentation is preferably maintained at a concentration of 70 to 150 ppm. When the concentration of the powdered activated carbon is less than 70 ppm, the algae adsorption power is insignificant, and when the concentration of the powdered activated carbon is more than 150 ppm, economic efficiency is reduced.

The purified water that has risen to the top of the rigid needle battery passes through the filter paper.

In addition, the present invention provides a water treatment system equipped with the algae treatment method, the water treatment system of the present invention is treated by chlorine treatment and powdered activated carbon is effectively made without mutual interference filter deadlock and odor due to algae Occurrence is prevented.

Hereinafter, examples of the present invention will be described. However, the following examples are intended to illustrate the invention and the present invention is not limited to the following examples.

Example 1

The purified water was passed through a settling basin and a forced sedimentation tank sequentially, but chlorine gas was introduced at a concentration of 1 ppm before the settling basin, and a sludge layer containing 100 ppm of powdered activated carbon was formed in the forced sedimentation tank to treat purified water.

Comparative Example 1

Chlorine treatment was performed in the same manner as in Example 1, but in the forced precipitation tank, the purified water was treated without a sludge layer containing powdered activated carbon. Odor was very bad in this case.

Comparative Example 2

Chlorine and powdered activated carbon were simultaneously added to the forced sedimentation tank. The charged amount was the same as in Example 1.

Algae removal rates of Example 1 and Comparative Examples 1 and 2 are shown in FIG. 2. At this time, the amount of algae was indicated by measuring the amount of chlorophyll-a generally used.                     

In the results of Figure 2, in the case of Example 1 it can be seen that algae are removed more than 90%. On the other hand, Comparative Examples 1 and 2 can be seen that the treatment efficiency is relatively low compared to the method proposed in the present invention as the algae removal rate of about 75%.

As described in detail above, according to the algae treatment method of the present invention can be economically treated without secondary pollution, such as clogged filter sand and odor caused by algae in a water purification plant that accommodates forced sedimentation.

Claims (3)

In the purified water treatment system for passing the purified water through the sedimentation basin, forced sedimentation tank and filter paper sequentially, A method for removing algae in a water treatment system, characterized in that chlorine is introduced in the front of a settlement and a sludge layer containing powdered activated carbon is maintained in a forced settlement. The method of claim 1, The concentration of the chlorine is 0.7 to 1.5 ppm, the concentration of the powdered activated carbon is 70 to 150 ppm algae removal method in a water treatment system. A water treatment system equipped with the algae removal method of claim 1.

Images