KR101841210B1 - A scrubber circulating water reuse devices utilize electric aggregation - Google Patents

Abstract

Disclosed is a scrubber circulating water reuse apparatus utilizing electrocoagulation. An electrocoagulation device for treating acid and alkali scraper wastewater containing particles; An electric tank in which a metal electrode is immersed in water and electricity is applied to the metal electrode to generate ions in the anode and generate hydrogen in the cathode; An agglomeration tank for removing aggregates by ions; Busan, which removes by - products from bubbles caused by hydrogen; A filter filter for filtering particles; And a circulation water processor for reusing the water passed through the electric bath, the flocculation bath, the bathtub bath, and the filter bath. Therefore, the removal of solids in the circulating water has been preceded by the removal of suspended solids in the circulating water, and the problem of reducing the scrubber treatment efficiency caused by the clogging of the scrubber due to suspended solids and contaminants has been solved through the biofiltration membrane, It is expected to reduce facility and maintenance costs by 30% and 40%, respectively, compared to existing processes, as technology to recycle circulating water by removing pollutants.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a scrubber circulating water recycling apparatus utilizing electro-

The present invention relates to a system for effectively treating and removing acid-containing particles and alkali scrubber wastewater, and more particularly, to an improved electrocoagulation and filtration process, Acid scrubbers which are concentrated at a high concentration and alkaline scrubber wastewater are effectively flocculated using a metal electrode and the particles causing turbidity are filtered to discharge the treated water to the water system, Circulating water reuse apparatus.

The control of air pollution is difficult to judge as a visible phenomenon when compared with other pollutants, and therefore, the phenomenon of air pollution is neglected and the damage is more serious.

Industrial production activities Various kinds of harmful gases and fine dusts generated in each process are varied and it is difficult to apply appropriate control and purification technology due to various effects on the human body.

These harmful gases can be classified into malodorous, volatile organic compounds (VOCs), flammable gas (PFC), toxic gas, etc., and the control and purification technology has been developed and applied for a long time. However, maintenance is difficult In addition, it can be said that the increase in maintenance cost is not enough.

One of the most commonly used cleaning techniques is a scrubber. This system collects high-purity fine particles in a gas by using a liquid (usually water), and can remove pollutants and expect a relatively high collection efficiency. .

This scrubber system usually requires 2 liters of water per minute at a treatment capacity of 1 cmm (cm ³ / min), the capacity of scrubber used in large-scale factories is 500 to 1500 cmm, and the amount of water required for this is 1440 to 4320 Tone is required.

In order for the gaseous pollutants to be absorbed and processed, it is necessary to contact with the absorbing liquid. In order to increase the treatment efficiency, the contact area with the absorbing liquid must be wide and the contact time must be long. In order to satisfy these two requirements, a nozzle is placed in the scrubber constant, and the absorption liquid is made into a small droplet so that the surface area of the absorption liquid is increased by filling the filling solution into the inside of the scrubber, And the surface area at which the gas contacts.

Gaseous contaminants are dissolved in the absorbing liquid from the surface of the absorbing liquid to form an ionic form. The longer the contact area and the longer the contact time, the lower the pollutant concentration of the gas. However, the higher the ion concentration of the absorption liquid, the more the process efficiency becomes lower because it does not melt. Therefore, the concentration of contaminants in the absorption liquid is lowered and the water is continuously supplied to the bottom of the scrubber in order to replenish the absorption liquid to be evaporated or to flow upward with the gas, and the absorption liquid is pumped up to the top of the scrubber using a pump.

If it is not simply treated with water, or if the concentration of the absorption liquid becomes too high, another compound is added to the absorption liquid to react and remove gaseous contaminants. (NaOH), potassium hydroxide (KOH), sodium carbonate (NA2CO3), and limestone. The water supplied to the scrubber is also used to maintain an appropriate pH.

Since the scrubber system requires a large amount of water in the process, more than 90% of the water used in the process is reused (circulating water).

The above method can reduce the amount of water used, but the nozzles for spraying the water and the packing are closed due to the increase of the load of floating matters and pollutants generated as the number of times of reuse is increased, and the treatment efficiency is decreased due to clogging inside the scrubber And periodically, the part replacement cost and the labor cost accordingly are used.

As can be seen in the table showing the annual replacement period of the circulating water of the scrubber, it is shown that the number of companies to replace 50 times a year is the highest, and the efficiency of the treatment is deteriorated due to the nozzle clogging even in the case of the short replacement cycle. This suggests that there is a limitation of the technology that can not solve the fundamental problem or the circulation water replacement is not performed properly.

Therefore, there is a need for a new technique capable of preventing the clogging of the inside of the scrubber by reducing the load of suspended solids (circulating water) and contaminants in the reusable water, thereby maintaining the treatment efficiency.

Application No.: 10-2009-0075157, Treatment of Fluorine-Containing Wastewater Application No. 10-2014-0117228, a perfluorocompound separation system in which a membrane system and a scrubber are integrally formed

In order to solve the above problems, an object of the present invention is to reduce the amount of water used by physically and chemically and physically treating a scrubber, which is a water electrostatic precipitator capable of reducing the load of suspended substances and pollutants, , Recycling of the circulating water generated in the scrubber is solved by reducing the clogging phenomenon inside the scrubber due to suspended substances and contaminants and solving the problem of reducing the scrubber treatment efficiency, and by using the electrocoagulation to maintain the stable treatment efficiency of the scrubber, And to provide a water reuse apparatus.

According to an aspect of the present invention, there is provided a scrubber for removing particles from water, An electric tank in which a metal electrode is immersed in water and electricity is applied to the metal electrode to generate ions in the anode and generate hydrogen in the cathode; An agglomeration tank for removing aggregates by ions; Busan, which removes by - products from bubbles caused by hydrogen; A filter filter for filtering particles; And a circulating water processor for reusing the water passed through the electric bath, the flocculation bath, the bathtub bath, and the filter bath.

The scrubber circulating water reuse apparatus utilizing electrocoagulation may further include a filter replacement unit for taking a new filter from the loading box and replacing the used filter with a new filter and stacking the used filter on the loader when the amount of aggregate and by- .

The filter replacement part notifies the lack of the filter when the number of new filters in the loading box becomes lower than a certain number, removes the used filter, and fills the new filter into the loading box.

In the case of using the scrubber recirculating water reuse apparatus utilizing the electrocoagulation according to the present invention, it is most preferred to remove the solids in the circulating water for reuse of the circulating water, The technology to reduce the scrubber treatment efficiency caused by the clogging phenomenon is the technology to remove circulating water by removing coagulated and mixed suspended solids pollutants through the biofilter membrane. It is possible to save 30% and 40% It is expected to be.

In addition, since the additional process of the settling tank or flotation tank due to the occurrence of the sludge, which is a problem in the conventional method for removing the scrubber solid, is not additionally required, when the load of the solid is small, It is expected to increase convenience and improve economic efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an apparatus for recycling a scrubber in an electrocoagulation according to an embodiment of the present invention; FIG.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a device for treating suspended solids and pollutants using a scrubber, which is a water electrostatic precipitator, by physico-chemical methods and reusing it. When inflow water is introduced in an upward flow method after filling filter media, It uses the principle that the solids contained in the inflow water flows through the filter media as it flows, and by using the principle of filtration, it removes the coagulated and mixed suspended matters through the electrolysis by the electrolysis before the filtration according to the conditions of the washing water. The main technical structure is the wastewater treatment system.

The process of the circulating water treatment and reuse supply device is a process of coagulating contaminants by different electrode plates according to the characteristics of the circulating water and effectively removing solid matters by floating by micro bubbles in the piping tank and reusing them. It is a device that can enhance the recycling rate of circulating water and reduce the load of wastewater flowing into wastewater treatment plant and stability of operation management at the same time.

The function of each reaction tank is as follows.

The circulating water generated from the scrubber is introduced into the flocculation tank, and the liquid inorganic coagulant is added to the flocculation tank depending on the circulating water characteristics. At this time, in the flocculation tank, the flocculant is formed by the inorganic flocculant, and the flocculant is formed by the stirring at the proper speed, so that the contaminants are adsorbed on the flocculant together to separate the pollutants in the water.

On the other hand, when the alkalinity is consumed by the acid generated by the inorganic flocculant, a chemical such as salt or acid may be injected to compensate for the alkalinity consumed or to maintain an appropriate pH for the flocculation reaction.

The contaminants and solid matter aggregated by the agglomerates are captured and oxidized and decomposed in the water by the biofiltration membrane filter media in the filtration tank, and the solid matter is removed by the mechanical separating action by the filter media and surface adhesion. When a biofilm is formed in a filtration tank, a variety of microorganisms, which are responsible for organic oxidation, nitrification and denitrification, adhere to the surface of the filter media to form a viscous and jelly-like aggregate. In order to obtain the energy required for cell synthesis, the organic material is degraded and cell proliferation is performed.

When the load of pollutants or solids is small, the circulation water can be used more efficiently by simplifying the treatment step by removing solids by the biofiltration membrane filter media through the filtration tank without passing through or through the flocculation tank without the coagulant.

Example 1

By introducing circulating water generated from the scrubber system into the flocculation tank, it is possible to reuse the circulating water by flocculating the contaminant by electrocoagulation or reduce the pollutant load of the treated water and discharge it to the waste water treatment plant.

More specifically, the present invention relates to a flocculation tank for introducing a scrubber circulating water as an influent water to form an aggregate through stirring after injecting a flocculant according to a circulating water phase, a flocculant for flocculating contaminants by injecting a pH adjusting agent for optimum flocculation,

It is located at the end of the coagulation tank and separates the sludge and solid matter adsorbed by the pollutants using filter media. The treated water is sent to the scrubber circulation pipeline again and used as circulating water or sent to the sewage treatment plant and discharged. .

The scrubber recirculating water reuse system according to the present invention prevents circulation water generated from the scrubber system from being frequently replaced due to clogging of the scrubber and packing pollution due to removal of contaminants and suspended matters through the present invention apparatus, And the maintenance cost can be greatly reduced by increasing the reuse rate and efficiency of the scrubber circulation water. In addition to reuse, the treated circulating water is introduced into the wastewater treatment plant, and it is possible to achieve stability and economy in operation management, and can be applied not only to the scrubber facility but also to the reuse of the cooling tower circulation water. Since it does not require much space, it is useful to introduce into existing scrubber facilities. It is a technology that does not require additional installation of sedimentation tank or flotation tank due to occurrence of sludge which is a problem in existing methods for removing solid matter, And is easy to operate.

The coagulant is injected into the scrubber treatment water to coagulate and remove the contaminants, and the solid material is filtered through the filtration tank using the filter media or the biofilm filter media to remove contaminants and suspended substances. The scrubber treated water from which pollutants and suspended matters are removed is returned to the scrubber system and recycled as the scrubber treated water as circulating water. In general, considering the characteristics and properties of the scrubber treated water, the solid material can be removed by filtration through a filter medium or a biofilm filter medium without passing the coagulant through a low concentration of the pollutant. The flexibility of the process has the advantage of simplifying the process and minimizing maintenance costs. The scrubber treated water that has undergone this filtration process is recycled and reused as scrubber treatment water or discharged to a wastewater treatment plant.

The flocculant of the scrubber circulating water treatment apparatus can inject the flocculant according to the characteristics and characteristics of the incoming scrubber circulating water, adjust the stirring speed to increase the formation of the flocculant, and use a pH adjuster to increase the flocculation efficiency It is a water treatment device.

The filtration tank of the scrubber circulation water treatment apparatus is a device for separating contaminants and solid substances by using a filter material suited to the characteristics of the contaminants and solid matter of the scrubber circulating water.

The filtration tank of the scrubber circulating water treatment apparatus is a water treatment apparatus capable of reusing all or a part of the treated water in which the pollutant and the solid substance are separated as the circulating water of the scrubber.

The filtration tank of the scrubber circulation water treatment device is a water treatment device capable of discharging all or a part of the treated water in which pollutants and solid matter are separated, to the sewage treatment plant.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an apparatus for recycling a scrubber in an electrocoagulation according to an embodiment of the present invention; FIG.

A scrubber 110 for removing particles from the water; An electric bath 120 in which the metal electrode 122 is immersed in the water 121 and electricity is applied to the metal electrode 122 to generate ions in the anode and generate hydrogen in the cathode; An aggregation tank 130 for removing the aggregate 131 by ions; (140) for removing by-products (141) due to bubbles caused by hydrogen; A filter set 150 for filtering particles; And a circulation water processor 160 for reusing the water passed through the electric bath 120, the flocculation bath 130, the bathtub bath 140, and the filter bath 150.

The scrubber 110 removes fluorine compounds, or acid and alkaline scrubber wastewater, or particles of scrubber wastewater having a high fluorine concentration with water. The scrubber 110 may be a water electrostatic precipitator. The scrubber 110 collects the particle particles on the dust collecting plate 111 by applying electricity to the dust collecting plate 111 and removes the particles by the water film 112 applied on the dust collecting plate. The scrubber 110 uses water to remove particles and reuse the used water.

The electric bath 120 immerses the metal electrode in the water 121, and electricity is applied to the metal electrode, so that ions are generated in the anode 122 and hydrogen is generated in the cathode.

The flocculation tank 130 removes the flocculated material 131 generated by the metal electrode. The metal electrode is any one of aluminum, copper, and iron. The ions generated from the metal electrode react with the particles dissolved in the water to produce an aggregate 131. The aggregate 131 is accumulated in the flocculation tank 130. The agglomerate 131 deposited under the flocculation tank 130 is removed by a removal plate driven in an endless track. The removal plate heats the flocculation 131 and cleans the flocculation tank 130. The agglomerates 131 taken off by the removal plate are loaded separately.

The bus vessel 140 removes the byproducts 141 due to bubbles generated by the hydrogen generated in the cathode. Hydrogen generated from the cathode produces a bubble. The bubble produces a byproduct 141. The by-product 141 floats on the water and is in the bath vessel 140. The byproduct 141 deposited on the bath vessel 140 is removed by a removing plate driven in an endless track. The removal plate cleans the by-product 141 and cleans the paddle bath 140. The by-products 141 removed by the removal plate are loaded separately.

The filter set 150 filters the particles. The filter bath 150 includes a multi-filter. The multi-filter determines the density, thickness, and the number of filters of the exhaust gas according to the property to be treated.

The circulation water processor 160 reuses water that has passed through the electric bath 120, the flocculation bath 130, the bathtub bath 140, and the filter bath 150.

The filter replacing unit 170 fetches a new filter from the loading box 171 and replaces the used filter with a new filter and loads the used filter 171 when the removal amount of the aggregate 131 and the by- ). The filter replacement unit 170 knows the new filter position being stored in the loading box 171 and can replace the used filter with a new filter when the replacement is necessary, in the empty space.

When the number of new filters is lowered to a certain number or less in the loading box 171, the filter replacing unit 170 informs of the lack of the filter, removes the used filter, and fills the loading filter 171 with the new filter. The filter replacement unit 170 instructs the user to fill in the new filter 171 by notifying the lack of the filter. The user fills the loading box 171 with the new filter and sets the new filter position to the filter replacing unit 170. [

The filter replacement unit 170 measures the daily filter usage amount and predicts the next day filter usage amount. The filter replacing unit 170 prepares the filter according to the predicted use amount of the next day filter. The filter replacing unit 170 can predict the use amount of the next day filter, so that the use of the filter can be planned. No filter shortage occurs because the filter is planned for use.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

110: scrubber 120: electric furnace
121: water 122: metal electrode
130: Coagulation tank 131: Aggregate
140: Busan Joo 141: Byproducts
150: Filter set 160: Circulation water processor
170: Filter replacement part 171:

Claims (3)

The fluorine compound of the scrubber wastewater having a high fluorine concentration, or the acid and the alkali scraper wastewater, or water is used to remove the particles by collecting the particle particles into the dust collecting plate by applying electric power to the dust collecting plate and removing the particles by the water film applied to the dust collecting plate A scrubber which is a water electrostatic precipitator for removing particles and reusing the used water;
An electric tank in which a metal electrode, which is one of aluminum, copper, and iron, is immersed in water supplied from the scrubber, electricity is generated in the metal electrode to generate ions in the anode, and hydrogen is generated in the anode;
An agglomeration tank which is formed on one side of the electric bath and in which ions generated at the anode of the metal electrode of the electric bath react with particles dissolved in the water to accumulate agglomerates generated on one side of the electric bath;
A bus vessel which is formed on the coagulation bath side on the electric bath so that by-products generated by the bubbles generated by the hydrogen generated in the cathode of the electric bath rise;
A filter tank for filtering the particles;
A circulation water processor for reusing water passed through the electric bath, the flocculation bath, the bathtub bath, and the filter bath;
If the particles including the agglomerate and the by-product exceed a certain level, a new filter is taken from the loading box, the used filter is replaced with the new filter, and the used filter is stacked on the loading box, When the number of filters is lower than a predetermined number, the filter is notified of the filter shortage, the filter is removed, the new filter is filled in the loading box, the daily filter usage is measured, And a filter replacement unit for preparing a scrubber circulating water recycling apparatus. delete delete

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