KR200285161Y1 - The apparatus for removing natural organic matters from water by using carbon dioxide in water treatment plants - Google Patents

Abstract

The present invention relates to a natural organic material removal device for water purification treatment using carbon dioxide to efficiently remove the natural organic matter contained in the raw water by supplying carbon dioxide to the raw water collected in the water well during the treatment.

The apparatus of the present invention includes a carbon dioxide storage tank 12 to which a refrigeration compressor 11 and a vaporizer 13 are connected, a heater 14 for vaporizing liquid carbon dioxide, and a regulator for supplying vaporized carbon dioxide at a constant pressure. 16), a carbon dioxide injector 15 equipped with a flow meter, a pH meter 18, and a diffuser 17 soaked in raw water, and a diffuser 17 is installed at the bottom of the landing pool where the raw water is collected. Carbon dioxide is supplied to the raw water before the purification.

The device of the present invention significantly reduces the amount of flocculant to remove natural organic substances contained in raw water and the amount of disinfection by-products generated by chlorine sterilization, thereby improving the stability of the water treatment process, and adding lime to reduce pipe corrosion. There is an advantage to reduce the usage of.

Description

The apparatus for removing natural organic matters from water by using carbon dioxide in water treatment plants}

The present invention relates to a natural organic matter removing device for removing natural organic matters (NOM) contained in purified water by injecting carbon dioxide. More specifically, most of the streams and general purpose water are collected in water purification tanks. By injecting carbon dioxide into raw water, carbon dioxide, which has been used to remove natural organic matters contained in raw water and significantly reduces the amount of disinfection by-products generated during chlorine sterilization and improves the stability of water purification process, has been used. The present invention relates to a natural organic material removal device for water treatment.

Purification, which is the process of improving the quality of raw water to suit its purpose by using the surface water of rivers or lakes as raw water, depends on the quality of the raw water, the use of water, and the specificity of the water supply process. This is achieved through sequential processes such as precipitation, chemical precipitation, slow sand filtration, rapid sand filtration and sterilization.

And, the first source of water to be collected is going through the landing well → mixed paper → flocculation → sedimentation → filter → sanitary bar, the starting well is where the collected raw water is stored first, and the mixed water is where raw water and purified water are mixed. Agglomerated paper is a place where various organic substances and impurities contained in water aggregate.

In addition, the sedimentation basin is divided into a common sedimentation battery which precipitates the sediment in a natural state, and a chemical sedimentation battery which sinks the aggregated sediment through the mixing and floc formation after the purification of the purified water. Slow filter paper is suitable and rapid filter paper is adopted for chemical settling. Impurities that do not settle in the settling paper are filtered out of filter paper and various pathogens are sterilized by chlorine disinfection in sterilized paper.

As described above, the water purified through the multi-step process has a significant influence on the water purification process, especially when the dry season and the rainy season are distinctly distinguished in Korea. In the domestic water treatment plant, there is a problem that there is an excessive amount of flocculant and chlorine input in order to purify the deteriorated raw water during the dry season or heavy rain.

In other words, in the case of water purification plants with poor quality of raw water, the amount of flocculant added in the year is large due to the nature of raw water, and thus, there is a problem in that the purified water treatment costs are excessively increased due to an increase in the amount of aggregated sludge.

In addition, when the pH of the raw water is increased by the algae, an appropriate flocculation condition for coagulating organic matters is not created during the water treatment process, so the amount of flocculant is excessively increased, and the turbidity of the sedimented water is increased to maintain an appropriate level of turbidity of the purified water. Since it is difficult to do so, it is necessary to drop the pH and adjust the pH to an optimal aggregation range.

In addition, during concentrated rainfall during the summer, the raw water for the water supplied from the dam or the river water having a relatively high alkalinity have a lower pH due to the addition of flocculant and chlorine during the water treatment process. Therefore, it acts as a cause of accelerating the corrosion of water supply and drainage pipes, and corrosion of pipes causes lime pollution to change the purified water into water and black water in the process of water supply and drainage. It is added in excess, but this causes another problem of turbidity in the water treatment process.

In addition, when the concentration and pH of natural organic substances in raw water rises by more than a few degrees, many disinfection byproducts are generated during the purification process. Especially, various types of carcinogens such as trihalogenmethan (THM) It is necessary to reduce the disinfection by-products by improving the water treatment process because the substances frequently exceed the allowable levels, which can cause fatal problems for the public health.

In addition, in order to reduce the disinfection by-products by improving the water treatment process, in particular, the mixing and flocculation process must be changed efficiently. To this end, various new water treatment devices and methods have been developed. There is an economic problem such as the need to modify or modify, and there is no clear device or method that can use the conventional water treatment system as it is.

The present invention prevents excessive input of flocculant and chlorine due to deterioration of raw water and reduces disinfection by-products in domestic water purification plants where dry and rainy seasons are clearly distinguished, but can be simply added and used without replacing or modifying conventional water treatment facilities. It is an object of the present invention to provide a device that can remove the natural organic matter economically and effectively.

1 is a connection diagram of an embodiment of the present invention.

((Explanation of symbols for main part of drawing))

11. Refrigeration compressor 12. Carbon dioxide storage tank

13. Carburetor 14. Heater

15. CO2 Injector 16. Regulator

17. Diffuser 18. pH meter

The object of the present invention is achieved by a storage tank for storing liquid carbon dioxide at a constant pressure, a heater for vaporizing liquid carbon dioxide, and a regulator for supplying vaporized carbon dioxide at a constant pressure.

The natural organic substance removal device for water purification using carbon dioxide of the present invention can optimize the input of flocculant when the carbon dioxide is injected into raw water before water purification to lower the pH to an appropriate level, thereby reducing the amount of disinfection by-products. As an apparatus for realizing the idea that it can be, there is a feature that can maintain the conventional water treatment apparatus and method as it is.

The device of the present invention is a device for injecting carbon dioxide into the intake raw water collected in the water well before being put into the water treatment process, and maintains the constant pressure of the liquid carbon dioxide stored in the storage tank as a refrigeration compressor and a vaporizer connected to the storage tank. After heating the liquid carbon dioxide at a predetermined pressure with a heater, the present invention has a technical feature of injecting gaseous carbon dioxide into raw water through a diffuser which is installed in the lower or bottom of the landing well as a carbon dioxide injector soaked in raw water.

In addition, the carbon dioxide injected into the raw water from the apparatus of the present invention is supplied by the pressure to be heated by the heater and vaporized in the liquid phase, the injection amount is controlled by a regulator provided in the carbon dioxide supply pipe immediately after the heater.

The details of the purpose and technical constitution according to the present invention, including the effect thereof, will be clearly understood by the following description with reference to the drawings showing preferred embodiments of the present invention.

1 shows a connection diagram of an embodiment of the present invention.

As shown, the apparatus of the present invention and the carbon dioxide storage tank 12 for storing the liquid carbon dioxide; In order to reduce the pressure in the storage tank 12 is connected to the storage tank 12 is supplied with carbon dioxide from the storage tank serves to reduce the temperature and return to the storage tank, provided with a refrigeration control panel (P) A refrigeration compressor (11); In order to increase the pressure in the storage tank 12, the vaporization control panel P ', which is connected to the storage tank 12 to supply carbon dioxide from the storage tank and raises its temperature and returns to the storage tank, A vaporizer 13 provided; In order to form a supply pressure for supplying gaseous carbon dioxide by supplying liquid carbon dioxide maintained at a predetermined range of pressure in the storage tank 12 and heating it to room temperature to vaporize the liquid carbon dioxide. A heater 14 having a P ″; and a carbon dioxide heated by the diffuser 16 connected to the heater 14 and immersed in the raw water W, and detecting the flow rate thereof to detect the flow rate of the heater control panel P ″. A carbon dioxide injector 15 for transmitting flow rate information to the side; A regulator (16) provided in a pipe connected from the heater (14) to the carbon dioxide injector (15) for adjusting the pressure of carbon dioxide in the pipe; A diffuser (17) connected to the carbon dioxide injector (15) and installed in a state of being submerged in the raw water (W) of the landing vessel (C) to become an outlet of vaporized carbon dioxide; It is configured to include a pH meter 18 for measuring the pH of the raw water in the state immersed in the raw water (W) and then transmits the pH measurement to the heater control panel (P ").

Partially looking at the device of the present invention is configured as described above, the liquid carbon dioxide storage tank 12 is operated by operating pressure of 200 ~ 350psi, the alarm signal is generated when the tank pressure is 225psi and 325psi to improve the stability Secure.

The refrigeration compressor 11 is operated when the pressure of the carbon dioxide storage tank 12 rises above a certain level, thereby cooling the carbon dioxide to lower the pressure of the storage tank, and stopping the operation when the proper pressure is maintained, and the vaporizer 13 ) Is operated when the pressure of the carbon dioxide storage tank 12 drops below a certain value, and the temperature is increased by raising the temperature of the carbon dioxide, and then stopped when the appropriate pressure is maintained. The refrigeration compressor 11 and the vaporizer ( The operation of 13) is automatically adjusted through the refrigeration control panel (P) and the vaporization control panel (P '), respectively.

In addition, it is preferable to install a relief valve (not shown) in the storage tank that can be operated at a pressure near 350 psi to prevent a safety accident that may occur in case of power failure or a failure of the refrigeration compressor. .

The capacity of the heater 14 is determined according to the injection amount of carbon dioxide per hour when the carbon dioxide is supplied in a gas state, and the pressure of the carbon dioxide vaporized to room temperature by the heater 14 is controlled by the regulator 16.

The pH meter 18 transmits the pH measurement information of the raw water to the heater control panel (P ") so that the injection of carbon dioxide can be stopped when the pH of the raw water falls below or rises above the proper range, and at the bottom of the impingement well. The diffuser 17 to be installed may be a ceramic tube type diffuser or a diffuser having a similar gas delivery force, and it is also preferable to use a multistage diffuser depending on the structure of the impingement crystal.

As described above, the natural organic material removal device for water treatment using carbon dioxide of the present invention can be applied while maintaining the existing water treatment process as it is economical because it does not require the cost of replacing existing equipment or changing the process. There is an advantage that it is easy to apply in the field.

In addition, the device of the present invention significantly reduces the amount of flocculant input, thereby reducing the amount of purified sludge and disinfection by-products, and is expected to reduce the cost of purified water, and it is easy to adjust the pH of raw water to reduce the amount of slaked lime to prevent pipe corrosion. It also has the benefit of preventing corrosion.

Claims (3)

A carbon dioxide storage tank 12 for storing liquid carbon dioxide; A refrigeration compressor (11) equipped with a refrigeration control panel (P) for reducing the temperature of the carbon dioxide supplied from the storage tank (12) and returning it to the storage tank (12); A vaporizer 13 having a vaporization control panel P ′ for raising the temperature of the carbon dioxide supplied from the storage tank 12 and returning it to the storage tank; A heater 14 equipped with a heater control panel P ″ for heating liquid carbon dioxide supplied from the storage tank 12; and delivering gaseous carbon dioxide supplied from the heater 14 to the diffuser 16; A carbon dioxide injector 15 which detects the flow rate and transmits flow rate information to the heater control panel P ″ side; A regulator (16) provided in a pipe connected from the heater (14) to the carbon dioxide injector (15) for adjusting the pressure of carbon dioxide in the pipe; A diffuser (17) connected to the carbon dioxide injector (15) and installed at the bottom of the landing well (C); Natural water removal device for water treatment using carbon dioxide, characterized in that it comprises a pH measuring device 18 for transmitting the pH value of the raw water (W) to the heater control panel (P "). The method of claim 1, wherein the carbon dioxide storage tank 12 is a natural organic material removal device for water treatment using carbon dioxide, characterized in that the relief valve is provided. The apparatus of claim 1, wherein the diffuser is a ceramic tube diffuser.