KR20180085629A - Method for Determining Amount of Wastewater Treating Agent Using Calculation Index and Apparatus for Treating Wastewater - Google Patents

Abstract

The present invention relates to a calculation index for calculating an amount of a wastewater treatment agent to be introduced; a calculation method for an amount of a wastewater treatment agent to be introduced using the calculation index; a wastewater treatment method for treating wastewater by introducing a wastewater treatment agent calculated by the calculation method into wastewater; and a wastewater treatment apparatus which treats wastewater by calculating an amount of a wastewater treatment agent to be introduced according to the calculation method. More specifically, the calculation index according to the present invention is a calculation index for calculating the amount of a wastewater treatment agent to be introduced in wastewater derived from a process of cutting and pelletizing a polymer with a glass transition temperature (Tg) of 150°C; and includes a first index which is a concentration of a surfactant component contained in the wastewater; and includes a second index which has a concentration of the wastewater treatment agent as a y axis, a concentration of the surfactant component as an x axis, and includes a linear function between concentrations of the wastewater and the surfactant component for each predetermined value of wastewater treatment level.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for calculating an input amount of a wastewater treatment agent using a calculation index and a wastewater treatment apparatus,

The present invention relates to a wastewater treatment apparatus, a wastewater treatment apparatus, and a wastewater treatment apparatus, which are capable of calculating an input amount of a wastewater treatment agent, calculating an input amount of a wastewater treatment agent using an output index, To a wastewater treatment apparatus for treating wastewater.

Generally, polymers are produced in the form of pellets and then commercialized by injection molding or extrusion molding. Further, in the case of a polymer having a high viscosity upon melting, such as ultrahigh molecular weight polyethylene, molding can not be performed by conventional injection and extrusion, and molding can be performed only by a method of compression sintering only in powder form. Such pelletization is essential to be.

However, materials having a very narrow melting point, such as an adhesive, a rubber base composition, a high-flow polyolefin, etc., or a material having a low melting point range or a material having a low viscosity and a thermal conductivity in a molten or semi-solid state, Underwater pelletization is used to cut the softened material in water.

As is known, underwater pelletization comprises a die plate with a composite orifice for extruding a softened polymer strand, wherein a plurality of The blades rotate, cutting the polymer strands into pellets, and the resulting pellets are transferred with water to a pellet dryer or dryer.

In the case of underwater pelletization, the pelletization of the strand in water is accompanied by the occurrence of highly turbid wastewater. Such wastewater should be treated to a level that can be transported to a sewage terminal treatment plant or discharged to a dischargeable level.

When the wastewater treatment occurring in the polymer production process is examined, a water treatment method using coagulant such as US4361132 and a water treatment method using a bentonite-based adsorbent such as US4897199 have been proposed.

However, since the synthesis equipment for mass production of polymer requires a great deal of cost in stopping and restarting the process, the continuous operation of the equipment is possible as long as the process is not interrupted. Various process parameters It is constantly being controlled. Accordingly, the properties of the wastewater generated in the course of polymer production also vary with time. However, studies on the amount of the wastewater treatment agent for stably treating the wastewater whose properties change with time are limited, and further, , The study on the treatment of wastewater from the pelletization process is also insufficient.

US4361132 US4897199

An object of the present invention is to provide an output index capable of calculating an input amount of a wastewater treatment agent which is introduced to treat wastewater generated in a pelletization process of a polymer having a low glass transition temperature and being pelletized in water.

Another object of the present invention is to provide an input amount calculation index of a wastewater treatment agent capable of stably processing a desired water with a minimum amount of input even if the composition of the wastewater changes with time.

It is still another object of the present invention to provide a method for calculating a wastewater treatment agent based on the calculation index provided by the present invention.

It is a further object of the present invention to provide a method for treating wastewater, based on the indices provided by the present invention.

It is still another object of the present invention to provide a wastewater treatment apparatus based on the calculation method provided by the present invention.

The calculation index according to the present invention is an index for calculating the input amount of the wastewater treatment agent which is introduced into the wastewater derived from the step of cutting the polymer having a glass transition temperature (Tg) of 150 DEG C or less and pelleting it, The concentration of the surfactant contained in the wastewater and the concentration of the wastewater treatment agent in the y-axis, the concentration of the surfactant in the x-axis, and the wastewater treatment agent concentration and surfactant And a two-dimensional index including a linear function between the components.

In the calculation index according to an embodiment of the present invention, the linear function may be a function that changes the y-axis intercept value of the linear function according to the set value.

In the calculation index according to an embodiment of the present invention, the x-axis and the y-axis have the same concentration unit, and the slope of the linear function may be 7 to 9. [

In the calculation index according to the embodiment of the present invention, the linear function for each set value may satisfy Equation (1).

(Equation 1)

y = a (x-c)

Wherein x is the concentration (mg / L) of the surfactant component, a is a real number from 7 to 9, and c is the concentration of the surfactant in mg / L. Value. ≪ / RTI >

The present invention includes a method for calculating the input amount of wastewater treatment agent using the above-mentioned calculation index.

Specifically, the method for calculating the input amount of the wastewater treatment agent according to the present invention is a method for calculating the input amount of the wastewater treatment agent according to the present invention by using the above- The input amount of the wastewater treatment agent is calculated.

The calculation method according to an embodiment of the present invention comprises the steps of: a) measuring the concentration of the surfactant contained in the wastewater to obtain a first indicator; b) the linear function between the concentration of the wastewater treatment (y) and the surfactant component (x) by the concentration of the wastewater treating agent as y, the concentration of the surfactant as x, And calculating the concentration of the wastewater treatment agent according to the first indicator by substituting the value of the first indicator into the linear function corresponding to the one set value using the dimension index.

In the calculation method according to an embodiment of the present invention, the polymer may be an elastomer.

In the calculation method according to an embodiment of the present invention, the elastomer may be an olefin-based elastomer.

In the calculation method according to an embodiment of the present invention, the wastewater treatment agent may include an adsorbent.

In the calculation method according to an embodiment of the present invention, the adsorbent may be a porous carbon-based material.

In the calculation method according to an embodiment of the present invention, the surfactant component may be a nonionic surfactant.

The present invention includes a wastewater treatment method for injecting a wastewater treatment agent into wastewater so as to satisfy a calculated value calculated using the abovementioned calculation index.

The present invention includes a wastewater treatment method for injecting a wastewater treatment agent so as to satisfy a calculated value calculated according to the above-described method for calculating a wastewater treatment agent input amount.

In detail, the wastewater treatment method according to the present invention is a treatment method of wastewater derived from a process of cutting a polymer having a glass transition temperature (Tg) of 150 DEG C or less and pelletizing the wastewater, And injecting the wastewater treatment agent into the wastewater so as to satisfy the calculated value calculated according to the following formula.

The present invention includes a wastewater treatment apparatus including a calculation section for calculating an amount of a wastewater treatment agent put into the wastewater using the above-mentioned calculation index.

The present invention includes a wastewater treatment apparatus including a calculation section for calculating an amount of a wastewater treatment agent put into the wastewater using the above-described calculation method.

The present invention includes a wastewater treatment apparatus for treating wastewater by the above-described wastewater treatment method.

A wastewater treatment apparatus according to the present invention is a wastewater treatment apparatus derived from a process of cutting a polymer having a glass transition temperature (Tg) of 150 DEG C or less and pelletizing the wastewater, Treatment tank; An input unit for inputting a wastewater treatment agent into the treatment tank; An input unit for inputting a first indicator value which is a concentration of a surfactant component of the wastewater flowing into the treatment tank and a first set value which is a treatment level of wastewater; (Y) and a surfactant component (x) in a linear function between the concentration of the wastewater treatment agent and the surfactant component (x) by the set value, which is the treatment level of the wastewater, A calculation unit for calculating a concentration of the waste water treating agent according to the first indicator value by substituting the first indicator value into the linear function corresponding to the set value; And a control unit interlocked with the calculating unit and controlling the charging unit so that the wastewater treating agent satisfying the calculated value calculated by the calculating unit is injected into the treatment tank.

INDUSTRIAL APPLICABILITY The waste water treatment agent injection amount calculation index, injection amount calculation method, wastewater treatment method and apparatus according to the present invention can stably treat wastewater with a minimum wastewater treatment agent even if the composition of wastewater changes with time. Accordingly, it is possible to minimize the cost of the wastewater treatment and to easily manage the quality of the wastewater to be treated.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a device diagram showing a wastewater treatment apparatus according to an embodiment of the present invention,
FIG. 2 is an example of a two-dimensional index according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in detail with reference to the accompanying drawings. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms, and the following drawings may be exaggerated in order to clarify the spirit of the present invention. Hereinafter, the technical and scientific terms used herein will be understood by those skilled in the art without departing from the scope of the present invention. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted.

As is known, there is a wide variety of contaminants in the wastewater generated in the polymer production process, and even if the physical and chemical (biochemical) characteristics of the treated wastewater are measured, various contaminants are associated with each other, It is very troublesome to treat the wastewater which changes in real-time in a stable manner by measuring the physical properties (characteristics) of the wastewater and adjusting the amount of the wastewater treatment agent and the treatment conditions based thereon.

However, the present applicant has found that, even in the case of a wastewater generated in a polymer production process, particularly in a wastewater generated in an underwater pelletization process, even if a change in wastewater composition with time occurs, It has been found that the input amount of the input wastewater treatment agent can be controlled and it is possible to stably treat wastewater whose composition is changed to a minimum wastewater treatment agent by controlling the amount of the wastewater treatment agent based on the specific component contained in the wastewater .

In the present invention, unless otherwise specified, the pelletizing process includes the steps of cutting a softened or molten polymer strand into particulate units such as particulates, granules, beads, powders, and the like . ≪ / RTI >

In addition, unless otherwise specified, the pelletization process refers to underwater pelletization, which may refer to an underwater pelletization process in which the polymer strand is cut by a blade or the like while submerged in water.

In the present invention, unless otherwise stated, the wastewater to be treated means wastewater derived from the polymer pelletization process. Specifically, the wastewater to be treated in the present invention means wastewater derived from the process of pelleting a polymer having a glass transition temperature (Tg) of 150 DEG C or less in water. As is known, water introduced during underwater pelletization prevents binding between the softened polymer and the rotating blades, regulates the cooling rate of the pellets (and / or strands), and serves as a carrier to transport the pellets produced Should be performed. Accordingly, the wastewater from the pelletizing process may contain an antitack agent commonly used in a conventional underwater pelletization process, and may contain an additive such as an antifoam agent. Additives contained in water used in such pelletizing processes are well known to those skilled in the art of polymer synthesis and production.

Here, the meaning of the wastewater originating from the pelletizing process is limited to meaning only wastewater discharged from the pelletizing process and not physically, biologically, and / or chemically pretreated (i.e., wastewater discharged directly from the pelletizing process) It should not be interpreted. That is, the wastewater from the pelletizing process should be interpreted to mean also the wastewater from which the pretreatment has been performed after being discharged from the pelletizing process. At this time, the pretreatment may include a step of physically filtering the wastewater by using a sieve (mesh) or the like in order to remove the coarse solid dispersion and the like.

However, the pretreatment can be selectively performed when necessary, and the wastewater treatment cost increases as the whole wastewater treatment process is performed in multiple stages. Accordingly, it is advantageous that the wastewater from the pelletizing process is wastewater discharged directly from the pelletizing process or physically filtered from the pelletizing process.

In the present invention, when a polymer has two or more glass transition temperatures (Tg), a polymer having a glass transition temperature of 150 DEG C or lower means that the lowest glass transition temperature among the two or more glass transition temperatures is 150 DEG C or lower will be. It is needless to say that the glass transition temperature (Tg) of the polymer may be measured according to ASTM D3418.

In the present invention, the polymer having a glass transition temperature of 150 DEG C or lower may comprise an elastomer. The elastomer is selected from natural rubber, synthetic rubber, polyolefin elastomer (POE), styrenic block copolymer (SBC), vinyl choloride elastomer, chlorinated polyethylene elastomer Polyurethane elastomer (TPE), polyamide elastomer (TPAE), fluorine-based elastomer (TPE), chlorinated polyethylene elastomer (CPE), urethane elastomer But are not limited to, at least one selected from the group consisting of fluorinated elastomers and silicone elastomers.

Substantially, the polymer to be pelletized in water may have a glass transition temperature of 100 占 폚 or lower, more practically 90 占 폚 or lower. The polymer having a glass transition temperature of 90 DEG C or lower may comprise a polyolefin-based elastomer. In detail, the polyolefin-based elastomer may be an olefin block copolymer, an olefin random copolymer, an ethylene copolymer, a propylene copolymer, or a mixture thereof. In one embodiment, the polyolefinic elastomer may be an ethylene olefin block copolymer, a propylene olefin block copolymer, an ethylene olefin random copolymer, a propylene olefin random copolymer, or a mixture thereof. In another embodiment, the olefinic elastomer is selected from the group consisting of an ethylene-propylene random copolymer, a ternary copolymer of ethylene and propylene-diene (EPDM), an ethylene-butene random copolymer, an ethylene-pentene olefin block copolymer, Ethylene-octene olefin block copolymer, ethylene-octene olefin block copolymer, ethylene-decene olefin block copolymer, propylene-ethylene olefin block copolymer, ethylene -olefin copolymer, An ethylene? -Olefin random copolymer, an ethylene? -Olefin block copolymer, or a mixture thereof. As a production method, the polyolefin-based elastomer may be one prepared by using a Ziegler-Natta catalyst or a metallocene catalyst.

In the present invention, the wastewater treatment agent whose amount is controlled according to the calculation index includes the adsorbent, unless otherwise specified. The adsorbent may be any substance known to be used to adsorb and remove oil contained in wastewater in the field of conventional wastewater treatment. As a specific example, the adsorbent may comprise a porous carbon-based material, a porous inorganic material, or a combination thereof, and may be in the form of granules or powder. More specifically, the adsorbent may be bentonite, kaolinite, zeolite, activated alumina, activated carbon, or a combination thereof, but is advantageously a porous carbonaceous material comprising activated carbon in terms of efficacy and economy. At this time, the meaning of the wastewater treatment agent whose amount is controlled according to the calculation index includes the adsorbent should not be interpreted as excluding the other additives to be treated for treatment of the wastewater to be treated regardless of the calculation index. That is, the fact that the wastewater treatment agent whose amount is controlled according to the calculation index includes the adsorbent means that at least the wastewater treatment agent containing the adsorbent is controlled in accordance with the calculation index and the amount of the wastewater treatment agent including the pH adjuster, It means that the additive can be introduced under the established conditions (a certain amount).

As described above, the present applicant has found that, even in the case of wastewater derived from an underwater pelletization process, even if the composition of the wastewater changes with time, the amount of the wastewater treatment agent put into the wastewater based on the specific component contained in the wastewater , And found that it is possible to calculate the amount of wastewater treatment agent that can achieve the desired wastewater treatment level, based on the specific ingredients contained in the wastewater. Furthermore, it has been found that the time required for the detection of a specific component contained in the wastewater is very short, so that even if the properties (composition) of the wastewater changes with time, the wastewater can be stably treated in real time.

The calculation index according to the present invention based on the above discovery can be used to calculate the input amount of the wastewater treatment agent which is injected into the wastewater derived from the process of pelletizing a polymer having a glass transition temperature (Tg) And the concentration of the surfactant in the x-axis is set as the concentration of the surfactant contained in the wastewater and the concentration of the wastewater treatment agent in the y-axis, and the concentration of the surfactant in the wastewater treatment Dimensional index including a linear function between the concentration and the surface active component.

That is, in the case of wastewater derived from an underwater pelletization process, by calculating the input amount of the wastewater treatment agent charged for wastewater treatment based on the surfactant component contained in the wastewater, even if the properties (composition) of the wastewater changes with time, It is possible to treat wastewater stably, and it is possible to add a minimum amount of wastewater treatment agent according to the property (composition) of the wastewater to be changed, thereby remarkably reducing the cost of wastewater treatment. Above all, by using the surfactant component contained in the wastewater as an indicator (first indicator), it is possible to accurately detect changes in the properties of wastewater in real time in real time, and to estimate the amount of wastewater treatment have.

Table 1 below shows the comparison of the surfactant component with the nH extraction method (the normal hexane extraction method according to EPA 1664) and the chemical oxygen demand (COD according to EPA 410.4), which are usually used for analyzing the quality of wastewater, ) Of the analysis time and analysis error of the present invention.

(Table 1)

As shown in Table 1, the nH extraction method is a method in which the analysis time is very long as 12 hours or more and the analysis error is large in real time as the extract is weighed and quantified by evaporating the solvent after extracting the oil with a solvent It is difficult to apply it to wastewater treatment sites where wastewater should be treated. The COD method has relatively short analysis time compared to n-H extraction method within 3 hours of analysis time, and it can analyze water quality comparatively accurately because there is little analysis error. However, as a result of conducting long-term various analyzes, it was confirmed that it is not possible to derive an indicator that predicts the amount of wastewater treatment agent as measured by the COD measurement value of the wastewater or the n-H extraction method. On the other hand, as shown in Table 1, the surfactant components contained in the wastewater can be detected within a time period of less than 10 minutes due to the short time required for the analysis, and it is possible to detect changes in properties of the wastewater in real time. As described above, the amount of the wastewater treatment agent to be introduced into the wastewater can be predicted by a two-dimensional index including a linear function between the concentration of the wastewater treatment agent and the surfactant component.

The surfactant component may be a known surfactant generally selected on the basis of efficacy and economical efficiency. Depending on the polymer to be pelletized, the specific surfactant component contained in the wastewater may be different, but the surfactant component may be a nonionic surfactant, And one or more surfactants selected from the group of anionic surfactants. More practically, as the polymer process is concerned, the surfactant component may comprise a biionic surfactant. Accordingly, in one embodiment of the present invention, the first indicator may include at least one surfactant concentration selected from the group consisting of a nonionic surfactant and an anionic surfactant, and more specifically, 1 Indicator may include the concentration of the nonionic surfactant. In this case, when two or more surfactants different from each other are present in the wastewater, it is needless to say that the concentration of the surfactant, which is the first indicator, is the total concentration which is the sum of two or more kinds of surfactant concentrations.

The anionic surfactant may include a chain hydrocarbon hydrophobic group and a hydrophilic group in the molecular structure and may include a salt such as a carboxylate, a sulfonate, a sulfate, a sulfate ester and / or a phosphate group, and the salt may be sodium, potassium, calcium, magnesium, Barium, iron, ammonium and / or amine salts. More specifically, the anionic surfactant is an alkyl or alkaryl group having 8-22 carbon atoms (C8-C22) in its molecular structure; And alkali metal, ammonium, and alkanol ammonium salts of organic sulfation products having sulfonic or sulfuric acid ester groups. In particular, anionic surfactants include alkylbenzenesulfonates having 8 to 22 carbon atoms (C8-C22), water-soluble salts of alkyl ether sulfates having 8 to 22 carbon atoms in the alkyl group and ethylene oxide in the ether group, alkyl Alkyl ether sulfosuccinates, alkyl ether sulfosuccinates, mono and dialkyl phosphate esters and ethoxylated alkyl ether sulfates, alkyl ether sulfosuccinates, alkyl sarcosinates, alkyl monoglyceride sulfates, ether sulfates, alkyl ether carboxylates, paraffin sulfonates, Derivatives such as acylmethyl taurate, petitic acid soap, collagen hydroxylate derivatives, sulfoacetate, acyl lactate, aryloxide disulfonate, sulfosuccinamide, naphthalene-formaldehyde condensates, and mixtures thereof However, the present invention is not limited thereto. Wherein the acyl group comprises one and two rings, the alkyl group generally comprises from 8 to 22 carbon atoms and the ether group may generally range from 1 to 9 moles of ethylene oxide (EO). More specifically, the anionic surfactant may be selected from the group consisting of laureth sulfate, (C14-C16) olefin sulfonate and / or alkylbenzene sulfonate (decylbenzene sulfonate, undecylbenzene sulfonate, dodecylbenzene sulfonate, tridecylbenzene Sodium salt, potassium salt, ammonium salt, triethanolammonium salt and / or isopropylammonium salt of sodium sulfonate, nonylbenzene sulfonate, etc., but the present invention is not limited thereto.

Specifically, the nonionic surfactant may be selected from the group consisting of ethoxylates, alkanoamides, amine oxides, acetylene glycols and / or polyols, sugar esters, sorbitan esters, glycerol esters , glycosides, etc.), and hydrophilic functional groups which are not dissociated from the water phase, and which have functional groups such as hydroxyl, ether, amine and amide. More specifically, the nonionic surfactant may comprise a condensate of ethylene oxide having a hydrophilic group moiety having a hydrophilic lipolytic balance (HLB) of 6 to 16, substantially 10 to 12.5. More specifically, the non-ionic surfactant comprises 1 to 8 carbon atoms having 8 to 24 carbon atoms (C8-C24) in a straight or branched chain configuration with 2 to 40, substantially 2 to 9 moles of ethylene oxide per mole of alcohol Or a secondary aliphatic alcohol. As another example, the non-ionic surfactant may comprise condensation products of alkylphenols having 6 to 12 carbon atoms (C6-C12) having 3 to 30, in particular 5 to 14, moles of ethylene oxide. It is also possible to use a nonionic surfactant having a straight-chain or branched alkyl or alkenyl group of 8 to 22 carbon atoms (C8-C22) and having fatty acid amides in the form of ammonia amide, monoethanol amide, diethanol amide or isopropanol amide Fatty acid amide-based ionic surfactants. Representative nonionic surfactants include ethoxylated alcohols (2-9 moles of ethylene oxide), ethoxylated alkyl (C6-C12) phenols, fatty acid esters, amine and amide derivatives, alkylpolyglycosides, Ethylene / propylene oxide copolymer, polyalcohol and / or ethoxylated polyalcohol, and the like, but are not limited thereto. The nonionic surfactant is suitable for the polymer process and can be used with other types of surfactants since it does not generate ions in the water phase and acts as a very good wetting agent to prevent the adhesion between the polymer strand and the blade Is known to be effective.

As described above, the calculation index according to one embodiment of the present invention is an index of the amount of the wastewater treatment agent to be introduced into the wastewater derived from the step of pelletizing the polymer having a glass transition temperature (Tg) The concentration of the surfactant contained in the wastewater, specifically, the concentration of one or more surfactant components selected from the group of the anionic surfactant and the nonionic surfactant, substantially the concentration of the surfactant contained in the wastewater The concentration of the surfactant may be included as the first indicator.

As described above, the calculation index according to the present invention includes, in addition to the first index, the concentration of the wastewater treatment agent in the y-axis, the concentration of the surface active ingredient in the x-axis, And may further include a two-dimensional index including a linear function between the concentration of the wastewater treatment agent and the surfactant component.

The treatment level of the wastewater may mean the level at which the wastewater is treated by the wastewater treatment agent in the treatment stage using the wastewater treatment agent, and the total wastewater discharged until the wastewater discharged from the underwater pelletization process is directly discharged or transferred to the sewage end treatment plant It may be a setting value suitably set by a person skilled in the art in consideration of the processing process. More specifically, the treatment level of the wastewater is determined by the chemical oxygen demand (COD, Chemical Oxygen Demand, substantially COD _Cr or COD _Mn , according to EPA 410.4) of the wastewater after treatment, which is wastewater after treatment by the wastewater treatment agent, , The value of one factor selected from nH (content of n-hexane extraction standard oil content mg / L, according to EPA 1664) and concentration of surfactant in treated wastewater.

As described above, the two-dimensional index is a linear function between the concentration of the wastewater treatment agent and the surfactant component on the y-axis-x axis, which is the concentration of the wastewater treating agent, , A linear function).

Such a two-dimensional index is obtained by substituting the value of the first indicator only into the (mapped) linear function corresponding to the processing level (the set value) according to the predetermined treatment level of the wastewater, (Concentration) of the wastewater treatment agent to be supplied to the wastewater can be directly and quickly calculated through a very simple process of calculating the function value (concentration of the wastewater treatment agent).

Even if the properties (composition) of the wastewater changes in real time by the one-dimensional index and the two-dimensional index, the input amount of the wastewater treatment agent to be inputted to treat the wastewater immediately and rapidly to the target wastewater treatment level is calculated And further, it is possible to prevent an excessive wastewater treatment agent from being abused for wastewater treatment.

Furthermore, in the case of wastewater generated in the underwater pelletization process among the various wastewaters generated in the polymer production process, the present applicant has found that even if the treatment level of wastewater is set differently, the slope of the linear function, It was found that only the y-axis intercept value of the linear function changes depending on the setting value of the wastewater treatment level. That is, the y-axis intercept value of the linear function can be changed according to the set value of the linear function, which is a two-dimensional index.

In a linear function of a two-dimensional index, the axis and the y-axis have the same concentration unit, and the slope of the linear function can be 7 to 9. [ The slope of the linear function may vary depending on the glass transition temperature (lowest glass transition temperature) of the polymer to be pelletized in water, but the glass transition temperature is 150 占 폚 or less, specifically, the glass transition temperature is 100 占 폚 or less, In the case of wastewater discharged from the process of underwater pelletization of a polymer having a molecular weight of 90 DEG C or lower, the slope of the linear function may be 7 to 9. [ Here, as described above, the polymer having a glass transition temperature of 90 DEG C or lower may comprise a polyolefin-based elastomer.

Substantially, in the calculation index according to the embodiment of the present invention, the linear function, which is a two-dimensional index, can satisfy the following formula 1 for each setting value.

(Equation 1)

y = a (x-c)

Y is the concentration of the wastewater treating agent to be treated to treat wastewater, x is the concentration of the surfactant component, a is a real number from 7 to 9, and c is a constant determined from the set value. As described above, the set value as the wastewater treatment level is a set value of one kind of factor selected from the chemical oxygen demand of the wastewater after treatment, the extraction value by the nH extraction method of the wastewater after treatment, and the concentration of the surfactant component of the wastewater after treatment have. In this case, when the parameter to be set is the surfactant concentration of the wastewater treated by the wastewater treatment agent, it is needless to say that the set surfactant concentration itself can be used as the constant c. However, even if the factor to be set is the chemical oxygen demand or the extraction value of nH, depending on the x-axis is the concentration of the surface active component in Equation 1, the chemical oxygen demand or the interface corresponding to the set nH extraction value It is advantageous that the concentration value of the active ingredient is used as a constant c. As a more practical example, the concentration of the wastewater treating agent and the concentration of the surfactant introduced in Equation 1 may each be in the unit of mg / L, and the constant c, which is the wastewater treatment level, may be a real number between 0 and 100, But is not limited thereto.

The present invention includes a method for calculating the input amount of a wastewater treatment agent using the above-mentioned calculation index.

In detail, the method for calculating the input amount of the wastewater treatment agent according to the present invention is a method for calculating the amount of the wastewater treatment agent added to the wastewater derived from the step of pelleting a polymer having a glass transition temperature (Tg) The input amount of the wastewater treatment agent to be charged can be calculated.

More specifically, the method for calculating the input amount of a wastewater treatment agent according to the present invention is a method for calculating an input amount of a wastewater treatment agent in a wastewater treatment apparatus having a first indicator which is a concentration of a surfactant component contained in wastewater and a concentration of a wastewater treatment agent on a y- The input amount of the wastewater treatment agent can be calculated by using a two-dimensional index including a linear function between the concentration of the wastewater treatment agent and the surfactant component according to the set value of the treatment level of the wastewater.

Specifically, the calculating method according to an embodiment of the present invention comprises the steps of: a) measuring a concentration of a surfactant contained in wastewater to obtain a first indicator; And b) a linear function between the concentration (y) of the wastewater treatment agent and the surfactant component (x) by the concentration of the wastewater treating agent as y, the concentration of the surfactant as x, The concentration of the wastewater treatment agent according to the first indicator is calculated by substituting the value of the first indicator obtained in step a) into the linear function corresponding to the one set value using the two-dimensional indicator, And a function value).

At this time, it is a matter of course that the first indicator in step a) and the amount (concentration) calculation of the wastewater treatment agent to be introduced into the wastewater in step b) can be repeatedly performed, Of course. By this repetition, even if the properties (composition) of the wastewater changes according to time, it is possible to treat the wastewater continuously and stably so as to satisfy the set processing condition using the minimum wastewater treatment agent in real time. The repeated execution interval may be appropriately changed in consideration of the property (composition) change of the wastewater with time, but as a non-limiting example, steps a) and b) may be repeated at intervals of 1 to 24 hours .

The measurement of the concentration of the surfactant for calculating the first indicator in the step a) may be performed by any known method capable of analyzing the content (concentration) of the surfactant in the aqueous solution. As is known, there are a method of analyzing the content of the surfactant in the aqueous solution, such as ultraviolet spectroscopic absorption, chromatography (anion exchange chromatography, gas chromatography, high performance liquid chromatography, ion chromatography) . However, for faster and more accurate analysis, it is advantageous that the concentration of the surfactant component in the wastewater is measured by ultraviolet spectroscopic absorption or colorimetric analysis. The colorimetric assay is a method of analyzing the concentration of the surfactant contained in the analyte by adding an indicator that reacts with the surfactant to the analyte to develop color, and measuring the degree of color development using a spectrophotometer or the like. As is known, an indicator of anionic surfactant is methylene blue. Thiocyanic cobalt ammonium can be used as an indicator of nonionic surfactant, but any known indicator may be used. When the first indicator is calculated using ultraviolet spectrophotometry or colorimetric analysis, the first indicator can be calculated using a commercially available analyzer to quantitatively detect the surfactant component in the aqueous solution. to be. However, it is needless to say that the concentration of the surfactant component analyzed through the above-described analytical method can be converted to have the same unit as the y-axis unit of the two-dimensional index and used as the first index.

The present invention includes a wastewater treatment method for injecting a wastewater treatment agent into wastewater so as to satisfy a calculated value calculated according to the above-described method for calculating a wastewater treatment agent input amount.

In detail, the wastewater treatment method according to the present invention is a treatment method of wastewater derived from a process of pelleting a polymer having a glass transition temperature (Tg) of 150 DEG C or less in water, And injecting the wastewater treatment agent into the wastewater so as to satisfy the calculated value according to the method.

Specifically, a wastewater treatment method according to the present invention comprises the steps of: a) measuring a concentration of a surfactant component contained in wastewater to obtain a first indicator; b) the linear function between the concentration of the wastewater treatment (y) and the surfactant component (x) by the concentration of the wastewater treating agent as y, the concentration of the surfactant as x, The concentration of the wastewater treatment agent according to the first indicator (a function of the linear function at the time of substitution of the first indicator value, a function of the linear function at the time of substitution of the first indicator value, Value); And c) supplying wastewater treatment agent to the wastewater so as to satisfy the concentration of the wastewater treatment agent calculated in the step b).

In the wastewater treatment method according to an embodiment of the present invention, the wastewater can be treated in a batch or continuous manner. The batch treatment may mean a discontinuous treatment in which the treated wastewater is discharged to the outside of the treatment tank after the wastewater is injected into the treatment tank and the wastewater treatment agent is injected to treat the wastewater in the treatment tank. The continuous treatment may mean continuous treatment in which the wastewater and wastewater treatment agent are continuously injected into the treatment tank and the wastewater treated in the treatment tank is continuously discharged.

In the wastewater treatment method according to an embodiment of the present invention, in the wastewater treatment, the first indicator of step a) is obtained in terms of quality control of the treated wastewater at a time interval of 1 to 24 hours, substantially 3 to 12 hours Can be repeatedly performed. However, when the first indicator is repeatedly obtained, the first indicator (n-1), which is the last measured indicator, 1) is substantially insignificant (for example, less than 1%), the step b) may not be performed and the first obtained indicator has a significant difference from the first indicator obtained immediately before (1% Or more), it is more efficient that step b) and step c) are carried out.

In the wastewater treatment method according to an embodiment of the present invention, the step of adding the additive added to the wastewater to be treated regardless of the calculation index to the wastewater for ordinary water treatment simultaneously with or after step b) . Such additives may include materials conventionally used for sludge formation of wastewater, and specific examples include pH adjusters and flocculants. As a practical example, after the step b), a step of injecting the pH adjusting agent and the flocculant into the wastewater may be further carried out, but the present invention is not limited to this ordinary water treatment step.

The present invention includes a wastewater treatment apparatus in which the above-described wastewater treatment method is performed.

The present invention includes a wastewater treatment apparatus including a calculation unit for calculating an amount of a wastewater treatment agent charged in the above-described wastewater treatment agent calculation method.

Specifically, the wastewater treatment apparatus according to the present invention is a wastewater treatment apparatus derived from a process of pelleting a polymer having a glass transition temperature (Tg) of 150 ° C or lower in water, A treatment tank which is treated by a treatment agent; An input unit for inputting a wastewater treatment agent into the treatment tank; An input unit for inputting a first set value, which is a concentration of a surfactant component in the wastewater flowing into the treatment tank, and a first set value, which is a treatment level of wastewater; (Y) and the surfactant component (x) by a set value, which is the treatment level of the wastewater, from the first set value and the first set value input to the input unit, Calculating a concentration of the wastewater treatment agent according to the first indicator value by substituting the first indicator value into the linear function corresponding to the value of the first indicator value; And a control unit interlocked with the calculating unit and controlling the input unit so that the wastewater treating agent satisfying the calculated value calculated by the calculating unit is input to the treatment tank.

1 is an apparatus view showing a wastewater treatment apparatus according to an embodiment of the present invention. As shown in FIG. 1, the treatment tank 100 may include a wastewater inlet pipe 101 through which wastewater flows from the outside. The wastewater inlet pipe 101 can be opened and closed by a valve, and the wastewater can be introduced into the treatment vessel 100 through a wastewater inlet pipe by a pump (not shown). The treatment tank 100 receives the wastewater treatment agent from the wastewater to be purified and the wastewater treatment agent input unit 200, and can treat the wastewater to a predetermined level. In this case, it is needless to say that the treatment tank 100 may be provided with a conventional stirring means including a blade so that the wastewater can be treated more quickly by the wastewater treatment agent. The wastewater discharge pipe 102 can be a valve that can be opened and closed by a valve and is connected to the treatment tank 100 by a pump Can be discharged. At this time, the wastewater discharged to the wastewater discharge pipe 102 may be discharged immediately without post treatment or transferred to the sewage end point depending on the treatment level.

The wastewater treatment agent input unit 200 is connected to the treatment tank 100 through an openable and closable pipe so as to store and supply the wastewater treatment agent. In this case, it is needless to say that the pipe connecting the waste water treatment agent input unit 200 and the treatment tank 100 may be connected to a pump for transferring and supplying a wastewater treatment agent.

1, the wastewater treatment apparatus includes an input unit 310 for inputting a first indicator value, which is a concentration of a surfactant component of wastewater flowing into the treatment tank 100, and a first set value, which is a treatment level of wastewater, A linear function between the concentration (y) of the wastewater treatment agent and the surfactant component (x) according to the set value, which is the treatment level of the wastewater, and the first indicator value and the first set value, (320) for calculating the concentration of the wastewater treatment agent according to the first indicator value by substituting the first indicator value into the linear function corresponding to the first set value, and the calculation unit (320) The control unit 330 controls the wastewater treatment agent input unit 200 so that the wastewater treatment agent satisfying the calculated value is input to the treatment tank 100. In this case, the wastewater treatment apparatus may further include a storage unit (not shown), and the storage unit may store a linear function according to the set value used in calculating the concentration of the wastewater treatment agent in the calculation unit 320.

The input unit 310 can receive the first indicator value and the first set value, which are information for calculating the concentration of the wastewater treatment agent, from the user in the calculating unit 320. Specifically, the input unit 310 can receive the concentration of the surfactant component of the wastewater injected from the user into the treatment tank 100 as the first indicator value. In the treatment tank 100, 1 Set value can be input. At this time, the first set value is selected from the chemical oxygen demand of the wastewater treated by the wastewater treatment agent, the nH extraction value of the wastewater treated by the wastewater treatment agent, and the concentration of the surfactant component of the wastewater treated by the wastewater treatment agent, as described above And may advantageously be the concentration of the surfactant component of the treated wastewater.

The input unit 310 may refer to a hardware configuration in which the first indicator value and the first set value, which are information for calculating the concentration of the wastewater treatment agent, can be input. For example, the input unit 310 may include a mouse, a key pad, a dome switch, a touch pad (a contact type capacitance type, a pressure type resistive film type, an infrared ray detection type, a surface ultrasonic wave conduction type , An integral tension measuring method, a piezo effect method, etc.), a jog wheel, a jog switch, and the like. The input unit 310 may include a touch screen, a touch panel, a keyboard, and the like. In addition, the input unit 310 may transmit information including the first index value and the first set value input by the user to the calculating unit 320. [

The calculating unit 320 receives the first indicator value and the first set value input through the input unit 310 and controls the concentration of the wastewater treatment agent according to the set value of the wastewater treatment level y) and the surfactant component (x), the concentration of the wastewater treatment agent according to the first indicator value can be calculated by substituting the first indicator value into the linear function corresponding to the first set value.

The control unit 330 receives the concentration of the wastewater treatment agent calculated by the calculation unit 320 and controls the wastewater treatment agent injection unit 200 according to the calculated value (concentration of the calculated wastewater treatment agent) can do. Specifically, the control unit 330 controls the wastewater treatment agent input unit 200 in such a manner that an amount of wastewater treatment agent that satisfies the concentration (calculated value) of the wastewater treatment agent calculated in the calculation unit 320 is inputted to the treatment tank 100, Can be controlled.

1, the control unit 330 controls the wastewater treatment agent input unit 200 and controls the flow of the wastewater through the wastewater inlet pipe 101 and the discharge of the wastewater through the wastewater discharge pipe 102 It is needless to say that it is possible to generally control the movement, the input and the discharge of the material accompanied by the treatment of the wastewater.

If necessary, the wastewater treatment apparatus may further include an additive input unit (not shown) which is controlled by the control unit 330 and inputs a predetermined amount to the wastewater, regardless of the calculated value calculated by the calculation unit 320, It is needless to say that such an additive input portion can be provided for each type of additive. As a non-limiting example, the additives include pH adjusters, organic flocculants, inorganic flocculants and the like, but the present invention is not limited thereto.

Needless to say, the wastewater treatment apparatus may further include an output unit (not shown). The output unit receives the first index value and the first set value input to the input unit 310, the linear function used to calculate the calculated value in the calculating unit 320, the calculated value calculated in the calculating unit 320, and the like And it can be hardware capable of outputting it to the user in a visually recognizable form. For example, the output unit may include a printer, a display panel (EPD, ECD, LCD, OLED, etc.), a touch panel, and the like.

(Example)

The concentration of the surfactant in the wastewater to be treated is used as the first indicator, and the activated carbon is used as the wastewater treatment agent in the wastewater generated in the underwater pelletization process of the polyolefin elastomer of the polymer factory in Ulsan, The wastewater was treated using a two-dimensional index, which is a linear function between the concentration of the wastewater treatment agent and the concentration of the surfactant component according to the treatment level (target in FIG. 2) according to FIG.

In detail, the COD _Cr of the wastewater to be treated at a time point (first time point) was about 1716 mg / L and the extraction value of nH was 450 mg / L. Using the Spectroquant® Prove300 instrument from Merck Millipore and the Surfactant Cell Test, the concentration of the surfactant in the wastewater to be treated was measured and the first indicator was 360 mg / L. 2 as the first index, and the treatment level of the wastewater (the concentration of the surfactant, the target in Fig. 2) as 60 mg / L is set as the first index, , Activated carbon was added to the wastewater to be treated, pH of the wastewater was adjusted to 12 with a pH adjuster, and coagulant was added at a concentration of 1000 mg / L to treat wastewater . After the treatment, the COD _Cr of the wastewater was 160 mg / L, the residual nH extraction value was 3.0 mg / L, and the residual surfactant concentration was 55 mg / L.

The wastewater generated in the underwater pelletization process of the polyolefin elastomer of the polymer factory in Ulsan was treated at the same time (the second time point) after 8 weeks from the first point. At the second time point, the COD _Cr of the wastewater was about 2700 mg / L and the nH extraction value was 370 mg / L. At the second time point, the concentration of the surfactant contained in the wastewater was 322 mg / L. The concentration of the surfactant component measured at the second time point is referred to as a first index, and the treatment level of the wastewater (the target of FIG. 2 as a set concentration of the surfactant component) is set at 100 mg / L in FIG. 2, The activated carbon was charged into the wastewater to be treated and the wastewater was treated by adding the pH adjuster and the coagulant to the wastewater under the same conditions as the first time. The COD _Cr of the wastewater treated at the second time point was 220 mg / L, the remaining nH extraction value was 29 mg / L, and the residual surfactant concentration was 66 mg / L.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Those skilled in the art will recognize that many modifications and variations are possible in light of the above teachings.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (13)

Is an index for calculating an input amount of a wastewater treatment agent which is injected into wastewater derived from a process of cutting a polymer having a glass transition temperature (Tg) of 150 DEG C or less and pelletizing the polymer, wherein the surfactant component The concentration of the surfactant in the x-axis, and the linear function between the concentration of the wastewater treatment agent and the surface active agent, And a calculation unit for calculating an output value of the calculation unit. The method according to claim 1,
Wherein the linear function is a calculation index in which the y-axis intercept value of the linear function is changed according to the set value. The method according to claim 1,
Wherein the x-axis and the y-axis have the same concentration unit, and the slope of the linear function is 7 to 9. The method according to claim 1,
Wherein the linear function for each set value satisfies Equation (1).
(Equation 1)
y = a (xc)
(Mg / L), x is the concentration of the surfactant (mg / L), a is a real number of 7 to 9, c is the concentration of the surfactant Which is a constant determined from the set value) A process for producing a polymer having a glass transition temperature (Tg) of 150 DEG C or lower by using the calculation index according to any one of claims 1 to 4, the polymer being fed into wastewater derived from a process for pelleting a polymer And calculating the input amount of the wastewater treatment agent. 6. The method of claim 5,
a) measuring the concentration of the surfactant contained in the wastewater to obtain a first indicator;
b) the linear function between the concentration of the wastewater treatment (y) and the surfactant component (x) by the concentration of the wastewater treating agent as y, the concentration of the surfactant as x, Calculating a concentration of the wastewater treatment agent according to the first indicator by substituting the value of the first indicator into a linear function corresponding to a set value using the dimension index. 6. The method of claim 5,
Wherein the polymer is an elastomer. 8. The method of claim 7,
Wherein the elastomer comprises an olefinic elastomer. 6. The method of claim 5,
Wherein the wastewater treatment agent comprises an adsorbent. 10. The method of claim 9,
Wherein the adsorbent comprises a porous carbon-based material. 6. The method of claim 5,
Wherein the surfactant component comprises a nonionic surfactant. A method for treating wastewater derived from a process of cutting a polymer having a glass transition temperature (Tg) of 150 DEG C or lower and pelletizing the wastewater, the method comprising the steps of: And supplying a waste water treatment agent to the waste water treatment apparatus. A device for treating wastewater derived from a process of cutting a polymer having a glass transition temperature (Tg) of 150 DEG C or less and pelletizing the same,
A treatment tank into which wastewater flows and is treated by a wastewater treatment agent;
An input unit for inputting a wastewater treatment agent into the treatment tank;
An input unit for inputting a first indicator value which is a concentration of a surfactant component of the wastewater flowing into the treatment tank and a first set value which is a treatment level of wastewater;
(Y) and a surfactant component (x) in a linear function between the concentration of the wastewater treatment agent and the surfactant component (x) by the set value, which is the treatment level of the wastewater, A calculation unit for calculating a concentration of the waste water treating agent according to the first indicator value by substituting the first indicator value into the linear function corresponding to the set value;
And a control unit interlocked with the calculating unit and controlling the charging unit such that a wastewater treating agent satisfying a calculated value calculated by the calculating unit is charged into the treatment tank.

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