KR100307975B1 - Rapid Flocculation and Settling by the Floc Pelletization - Google Patents

Abstract

In the present invention, in the treatment of the purified water by agglomeration and sedimentation of purified water, the sedimentation efficiency is increased by the high-speed aggregation and precipitation by the formation of pellet seed during the purification process, and the sludge layer is formed on the top of the pellet bed by the upward flow rate. The present invention relates to a high-speed flocculation and sedimentation system using pelletization of flocs which can improve the water quality of the treated water while filtration.

In order to shorten the existing settling time (3-5 hours), the present invention forms a pellet seed in consideration of the zeta potential, which is a major factor of the flocculation process, and then the floc is dense and upward with upflow and slight power in the pellet bed. Form large pellets that can overcome the force caused by the flow velocity, and settle at high speed, and small pellets grow to become large pellets, which flow into the pellet bed again, settle and settle at high speed. The formation of a layer is filtered to improve the quality of the treated water.

Description

Rapid Flocculation and Settling by the Floc Pelletization

In the present invention, in the treatment of the purified water by agglomeration and sedimentation of purified water, sedimentation efficiency is increased by the formation of pellet seed and high-speed flocculation and precipitation during the purification process, and a sludge layer is formed on the top of the pellet bed by the upward flow rate. The present invention relates to a high-speed flocculation and sedimentation system using pelletization of flocs that can perform filtration and improve the water quality.

As shown in FIG. 1, the flocculation and sedimentation processes used in the existing water treatment plant are mixed with a water treatment chemical and a water treatment chemical (1) for physically precipitating foreign substances contained in the purified water. The mixing paper (2) to be mixed, the floc forming paper (3) forming floc in the purified water mixed with the water treatment chemicals in the mixing paper (2), and the floc formed in the floc forming paper (3) by gravity The natural precipitate is composed of a sedimentation basin (4), and the purified water from which floc is precipitated in the sedimentation basin (4) is filtered through a filter paper at a rear end and then supplied as a constant.

The floc 5 precipitated in the sedimentation basin 4 is settled in a parabolic form by its own gravity, and takes about 3-5 hours to settle, so that the land area of the sedimentation basin 5 takes a large amount. Particularly, the horizontal flow type treatment lowers the settling efficiency and the fine floc overflows, which can increase the load in the subsequent filtration process.In addition, the residual water treatment chemicals may be excessive, the chemical consumption is high, and the sludge moisture content is high. It can be excessive.

In order to shorten the existing settling time (3-5 hours), the present invention forms a pellet seed in consideration of the zeta potential, which is a major factor of the coagulation process, and then uses a horizontal flow type with upflow and slight power in the pellet bed. Forms large pellets that are denser than flocs in the sedimentation basin, and settles at high speed by overcoming the force caused by the upward flow rate, and small pellets grow into large pellets, which again flow into the pellet bed to settle and settle at high speed. In order to improve the water quality of the treated water by raising the sludge layer by the upward flow rate, the present invention can improve the surface quality by injecting the upward flow rate at 0.25-0.38 cm / sec. / Cm2 · hr) can increase the treatment efficiency by 2-4 times compared to the existing horizontal flow treatment, while reducing the area corresponding to the area of the existing sedimentation basin.

In particular, high-density pellets can be used for high-speed sedimentation, which can reduce the load of filter paper, which is a subsequent process, and reduce the amount of coagulant injection of 50% or more. As a result, it is possible to reduce the concentration cost and to reduce the glass management cost by discharging the sludge by the depth pressure.

1 is a conventional flocculation and precipitation process diagram

Figure 2 is a high speed agglomeration and precipitation process diagram of the present invention

Figure 3 is another high speed agglomeration and precipitation process diagram of the present invention

[Description of the symbols on the main parts of the drawings]

DESCRIPTION OF REFERENCE NUMERALS 1 Landing well 2 Mixed paper 3 Flush forming paper

9: Inlet pipe 10: Line mixer 11: Pellet seed tank

20: main body 30, 30a, 30b: pellet bed 32, 32a, 32b: blade

40: cone cone 41: scraper 50: movable tilt plate

60: body

Figure 2 is a high speed agglomeration and precipitation process diagram of the present invention suitable for small scale water treatment,

Line mixer: 10 which mixes raw water with Alum for rapid mixing, and pellets, which form pellet seed for the mixed solution rapidly mixed in line mixer 10. The seed tank 11 and the pelletized water tank are formed of pellet forming means for forming pellets by flowing the treated water introduced from the pellet seed tank 11 upwardly while stirring.

The pellet forming means includes a rectangular cylindrical body 20, a pellet bed 30 installed at the center of the body and forming pellets, an inlet pipe 9 for introducing the treated water from the lower side of the pellet bed 30 to the upper part; Conical cone 40 positioned below the pellet bed 30 and having a conical shape and discharging pellets from the center, a scraper 41 inscribed and rotating inside the conical cone 40, and a body 20. ) And a motor (31) for rotating the blade (32) and the scraper (41) inside the pellet bed (30) in the upper portion of the movable inclined plate (50). .

Here, the pellet bed 30 is configured to open the upper portion at an angle of 60 ° to the ground and to narrow the lower portion to the angle of 60 ° to the ground, and the movable inclined plate 50 is provided with a large number of inclined plates 51 at 60 ° angle with the ground. The movable inclined plate 50 is made of polycarbon and is composed of a removable structure.

Flow meters (7) and (8) are installed at the raw water inlet and the outlet of the pellet seed tank (11), and the line mixer (10) and the pellet seed tank (11) are installed in the pellet seed tank (11) by the motor (12). The blade 13 is configured to rotate.

And the sludge discharged to the lower center of the conical cone 40 is configured to be discharged by the sludge pump 42.

Figure 3 is another high speed agglomeration and precipitation process diagram of the present invention suitable for the purification of existing or newly established plant

After the pellet seed is formed in the pellet seed tank 11, the pellet beds 30, 30 a, 30 b are introduced into the main body 60 in which a plurality of pellet beds are formed, and the inlet pipe 9 is formed in each pellet bed 30 ( 30a) 30b.

Here, the motors 31, 31a, 31b for rotating the blades 32, 32a, 32b located inside the pellet beds 30, 30a, 30b are installed, and the movable inclined plate 50 is placed on the upper part. The pellet beds 30, 30a, 30b, blades 32, 32a, 32b, motors 31, 31a, 31b, and the movable inclined plate 50 described above are shown in FIG. It is the same as the structure, but a plurality of pellet beds 30, 30a, 30b is installed in one main body 60.

And the lower part of the main body 60 is inclined like the conical cone 40 of FIG. 2 and configured to discharge the pellets collected on the inclined surface by the sludge pump 42.

This invention of such a structure is demonstrated in detail based on FIG. 2 suitable for a small scale water purification process.

The purified water to be purified is mixed with the treatment agent ALUM and rapidly mixed in the line mixer 10 to be stirred in the pelleted tank 11.

Here, the line mixer 10 satisfies the conditions of G = 15.000-16.000 / sec and T = 1-2sec, and the pellet seed tank 11 rotates the blade 13 with the motor 12 to stir.

The pellet seed tank 11 provides an upward flow rate from the bottom of the pellet bed 30 through the inlet pipe 9 after the pellet seed is formed.

Here, the pellet seed tank 11 rotates the blade 13 by the motor 12 and satisfies the conditions of G = 50-100, 100-200 rpm, and T = 10-15 minutes.

The pellet bed 30 satisfies the condition of T = 400-500 sec and has a 60 ° slope with the ground at the top and the bottom, respectively.

The pellet bed 30 has a flow rate from the lower part to the upper part so that the small pellet is rolled up from the inclined part of the upper and lower parts and the pellet is grown by being introduced into the pellet bed 30 again. Is easily settled under the pellet bed (30).

At this time, in the center of the pellet bed 30, five blades 32 rotated by the motor 31 are installed to satisfy the conditions of G = 1.0-10.0, 1-10 rpm, and T = 7-10 minutes to help pelletization. .

The movable slant plate 50 is installed on the upper portion of the main body 20 in which the pellet bed 30 is installed, so that the micro floc is trapped so as not to be overflowed, and the microfloc captured by the movable slant plate 50 is a sludge blanket (52). To form a filter.

Here, the movable inclined plate 50 is detachably installed with a polycarbon material at an angle of 60 ° and the sludge blanket 52 serves to filter to improve the quality of the treated water.

As such, the pellets are formed by using the blade 32 which is rotated by the upstream flow rate (0.25-0.38m / sec) and the motor 31 by producing a dense sludge to increase the settling speed.

Cone-shaped cone 40 is installed below the pellet bed 30, and the cone-shaped cone 40 rotates the scraper 41 at the same angular speed (1-10 rpm) as the motor M rotation to smoothly discharge the sludge and the sludge pump. In (42), the sludge amount formed at a given time can be continuously and smoothly discharged.

The present invention achieves a 50% reduction in the amount of flocculant injection based on the theory of reducing the amount of flocculant injection and zeta potential at the ALT Ratio in order to realize good pelletization. By mixing, the flocculation and precipitation processes are realized simultaneously.

On the other hand, Figure 3 is a device suitable for water treatment of existing or newly set up the plant similar to that of Figure 2, but a plurality of pellet beds 30, 30a, 30b in the main body 60 is installed and the lower part of the main body 60 The installation inclined in the form of a cone is different.

That is, the blades 32, 32a and 32b are rotated by the motors 31, 31a and 31b, and the pellet beds 30, 30a and 30b have a structure and an upward flow rate (0.25-0.38 cm / sec). Forming and growing the pellets, the grown pellets are collected in an inclined plate installed at an angle of 60 degrees below the main body 60 and discharged to the sludge pump 42.

The present invention injects an upward flow rate of 0.25-0.38 cm / sec to the surface load ratio of the inside of the pellet bed (30) (30a) (30b) to 250-300 (cm 3 / cm 2 · hr) than conventional horizontal flow treatment While increasing the processing efficiency 3-4 times, the area corresponding to the area of the existing sedimentation basin can be reduced.In particular, high-speed precipitation of dense pellets can reduce the load of the filter paper, which is a subsequent process, and reduce the amount of coagulant injected by 50% or more. The water content of the waste sludge is 95% or less, so that the sludge is more than three times more concentrated than the existing one, and thus the concentration ratio can be reduced, and the sludge discharged by the depth pressure can reduce the glass management cost.

When the present invention is made as a table comparing the existing sedimentation process and pilot plant and demo plant process as follows.

A fair person Existing precipitation process Pilot plant Demo plant Comparison of effect improvement with existing process HRT (hr) 3.5-4.5 0.33 1.7 1 / 2-1 / 4 production speed Surface load rate (cm 3 / cm 2 · hr) 57-74 100-150 250 2-4 times yield Treated Water Turbidity (NTU) 0.7-2.0 0.4-1.0 0.4-1.0 Very good Coagulant Injection Rate One 0.5 or less 0.5 or less Less than 50% Sludge moisture content (%) 99.5-98.0 95 or less 95 or less 3 times more concentrated sludge

As can be seen from the above table, the present invention has a surface load ratio of 250-300 (cm 3 / cm 2 · hr), which is better in precipitation efficiency than the existing precipitation process, thereby increasing the processing efficiency (output) per hour (3-4 times) or required for the sedimentation basin of water purification plant. It is possible to compact the water treatment system with a large reduction to 1 / 3-1 / 4 of the area, and to shorten the time of water treatment (water production) by high-speed aggregation and sedimentation. It can be reduced to less than%, and the quality of the treated water can reduce the load of the filtration facility, which is a subsequent process, and reduce the sludge water treatment rate due to the high density of floc.

In order to shorten the existing settling time (3-5 hours), after forming the pellet seed in consideration of the zeta potential, which is the main factor of the flocculation process, the pellet bed is dense and upward flow rate with upflow and slight power. Forming large pellets that can overcome the force by the sedimentation at high speed, and small pellets grow to become large pellets, which flows back into the pellet bed to settle and settle at high speed. Formation of a layer to perform the filtration function to improve the water quality of the treated water The present invention is better than the existing sedimentation process, the sedimentation efficiency is good and compact to realize a 3-4 times increase in the treatment efficiency (production) per hour or water purification plant It is suitable for small-scale water purification treatment or water purification treatment of existing and newly set up shoes by drastically reducing to 1 / 3-1 / 4 of the required area of sedimentation basin In the drug it can achieve a reduction in operating expenses in the 50% improvement can be reduced to not higher than quality of the treated water, sludge, and reduce processing costs for sludge discharge that will enhance the overall efficiency of the water treatment.

Claims (5)

A line mixer 10 for rapidly mixing water by mixing purified water with treatment chemicals (Alum), a pellet seed tank (11) for forming a pellet seed after stirring the treated water rapidly mixed in the line mixer (10), and a pellet A high speed flocculation and sedimentation system using pelletization of the floc, characterized in that consisting of pellet forming means for increasing the flow rate of the treated water introduced from the seed tank (11) while stirring. Pellet forming means in claim 1 is a rectangular cylindrical body 20, the pellet bed 30 is formed in the center of the body and forming a pellet, the inlet pipe for introducing the treated water from the bottom of the pellet bed 30 (9), a conical cone (40) positioned below the pellet bed (30) and made of a conical shape and discharging pellets from the center, and a scraper (41) inscribed and rotating inside the conical cone (40); , A mobile inclined plate 50 mounted on an upper portion of the body 20 and capturing microflocs, and a motor for rotating the blade 32 and the scraper 41 inside the pellet bed 30 at an upper portion of the movable inclined plate 50 ( A high speed aggregation and precipitation system using pelletization of the floc, characterized in that consisting of 31). In claim 2, the pellet bed 30 is configured to open the upper portion at an angle of 60 degrees to the ground and to narrow the lower portion to 60 degrees with the ground, and installed several blades 32 therein to the motor (31) G Fast agglomeration and sedimentation system using pelletized floc, characterized in that it is operated under conditions of = 1.0-10.0, 1-10 rpm, T = 7-10 minutes. In claim 2, the movable inclined plate 50 is installed with a large number of inclined plate 51 at a 60 ° angle with the ground and the movable inclined plate 51 is made of polycarbon pellets of the floc, characterized in that removable High speed aggregation and precipitation system. According to claim 1, the pellet forming means is installed a plurality of pellet beds 30, 30a, 30b in the main body 60, the inclined plate formed with a 60 ° angle at the bottom and the pellet bed (30, 30a) (30b) A high-speed flocculation and sedimentation system using pelletization of flocs, characterized in that blades (32) (32a) and (32b) are provided on the inside and a movable inclined plate (51) is provided on the top.