KR100219854B1 - Method for treating waste water - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method for treating dyed wastewater, which is a high concentration of organic wastewater.

2. Technical problem to be solved by the invention

8,000ppm이고, 염분농도가 30,000

50,000ppm인 고농도폐수의 폐수처리공정을 최단시간으로 처리하면서 높은 처리효율을 얻고, 또 슬럿지의 량을 최소화하는 방법을 제공하는데 있다.The present invention has a COD of 2,000, such as wastewater generated from a dye production process that is difficult to remove color and wastewater generated from a dyeing process.

8,000 ppm, salinity 30,000

It is to provide a method for obtaining high treatment efficiency and minimizing sludge while treating the wastewater treatment process of high concentration wastewater of 50,000 ppm in the shortest time.

3. Summary of Solution to Invention

In the present invention, "a wastewater is passed through the diatomaceous earth filter 11, which is an adsorptive filter, to remove fine suspended matter particles and organic substances, and the like is separated from the adsorbent material, and the membrane separator is provided with a nanofiltration membrane. 13) to separate the concentrated water containing a large amount of organic materials and inorganic ions and the treated water from which the organic materials and inorganic ions are removed, and then go through the necessary treatment process "to solve the above problems.

4. Important uses of the invention

The present invention is to treat the wastewater of the manufacturing process and dyeing process of the dye.

Description

Treatment method of dye wastewater

The present invention relates to a method for treating wastewater discharged from dyes and dyeing plants, and more particularly, to a method for treating wastewater containing high concentrations of organic substances generated in a dye production plant or a dyeing plant.

In general, the treatment of wastewater from dye production process and high concentration of organic wastewater from dyeing process requires several steps of physical treatment, chemical treatment and biological treatment. do.

In addition, the wastewater generated from the dye manufacturing process and the dyeing process has a higher salinity than the general wastewater, and thus, microbial activity is not active in the biological treatment process, requiring a long period of treatment and a large amount of dilution water. There is a problem that should be used, if the dilution water is not used due to the osmotic phenomenon could not achieve the desired effect.

FIG. 1 shows a schematic diagram of a conventional treatment method involving the above problems.

Looking at the conventional treatment flow diagram as shown in Figure 1, the high concentration of organic wastewater generated from the dye manufacturing process or dyeing treatment process stored in the water collecting tank (1) for a certain period of time, such as solids such as sediment generated first The wastewater from which the solids were removed was moved to the chemical treatment tank (2), stirred and mixed by adding a co-precipitation agent and / or a pH adjusting agent, and then moved to the separation tank (3) by filtration or precipitation. After separating the sludge, part of the separated sludge is returned to serve as an auxiliary co-precipitation again, and the remaining sludge is discarded, and the separated filtrate is subjected to microbial treatment in aerobic reactor (4) and anaerobic reactor (5). The generated microbial sludge is disposed or returned to treatment, and the microbial wastewater is discharged.

As described above, the treatment method having the above system not only takes a lot of time to process because the activity of the microorganisms in the aerobic reaction tank 4 and the anaerobic reaction tank 5 is slowed by the high salt concentration, Even in the discharged water, wastewater having a high salt concentration is discharged and a large amount of dilution water is required.

8,000ppm이고, 염분농도가 30,000

50,000ppm인 고농도폐수의 폐수처리공정을 최단시간으로 처리하면서 높은 처리효율을 얻고, 또 슬럿지의 량을 최소화하는 방법을 제공하는데 있다.The present invention has a COD of 2,000, such as wastewater generated from a dye production process that is difficult to remove color and wastewater generated from a dyeing process.

8,000 ppm, salinity 30,000

It is to provide a method for obtaining high treatment efficiency and minimizing sludge while treating the wastewater treatment process of high concentration wastewater of 50,000 ppm in the shortest time.

1 is a conventional treatment flow diagram for treating dyed wastewater.

2 is a process flow diagram in the present invention.

3 is an explanatory diagram of a nanofiltration system membrane separator.

Figure 4 is a flow diagram for one embodiment of dyeing wastewater treatment using the present invention.

* Explanation of symbols for main parts of the drawings

1: collection tank 2: chemical treatment tank

3: sedimentation separation tank 4: aerobic reaction tank

5: anaerobic reactor 11: diatomaceous earth filter

12,14,19: reservoir 13: nanofiltration system

131: separator 132: concentrated water pipe

133: concentrated liquid storage tank 134: treated water pipe

15: chemical reaction tank 16: concentration tank

17: presser 20: separation tank

22: Reverse Osmosis Nanofiltration System P, P ': Pump

According to the present invention, the present invention will be described by the physical method prior to the process such as chemical treatment according to the processing system diagram as shown in FIG. 2 as follows.

The dye manufacturing process wastewater or dye wastewater (hereinafter referred to as "dye wastewater") stored in the collection tank 1 is passed through a diatomaceous earth filter 11 which is an adsorptive filter to remove fine suspended matter and organic matter. After separating the adsorptive material, and storing the separated water in the storage tank 12, the nano-filter is installed and passed through the nano-filtration system 13 to desalting, the concentrated liquid generated by the desalination is dried by a drying process After drying, salt is produced and reused, or chemical treatment is performed to remove salt and sludge, and the remaining filtrate is returned to the first collection tank.

The desalted solution desalted by the nanofiltration system 13 is discharged, reused, or chemically treated and biologically treated, and then discharged or stored in a storage tank, and then treated with reverse osmosis to purify the water into industrial water for dyeing. Reuse

20배 이상의 용적을 갖도록 팽창시켜 물에 분사시킨 다음 적당한 여과기에 규조토막을 형성시킨 것으로 경우에 따라서는 다수개를 직렬로 설치하여 사용될 수도 있는 것으로 고열의 금속처리에 의하여 다수의 기공이 형성되어 흡착성이 뛰어날 뿐만 아니라, 이온교환능력을 보유하여 부유물 등의 미세입자의 분리에 주로 이용되는 것이다.Diatomaceous earth filter (11) used in the present invention is a general diatomaceous earth metal treatment at a high temperature of 1200 ℃ 10

It is expanded to have a volume of 20 times or more and sprayed into water, and a diatomaceous earth membrane is formed in a suitable filter. In some cases, a plurality of pores may be installed in series. In addition to having excellent ion exchange ability, it is mainly used for the separation of fine particles such as suspended solids.

Membrane separators have membranes made of polymer polymers that exclude solutes of the desired molecular weight from permeating the membrane and allow only solutes of less than the desired molecular weight to pass through. ).

Reverse osmosis membranes have an excretion molecular weight of about 50 and are designed to prevent inorganic sodium chloride (NaCl) from permeating the membrane, and ultrafiltration membranes are designed with an excretion molecular weight of thousands or more to pass low-molecular-weight organic substances and salts.

On the other hand, nanofiltration is relatively smaller than ultrafiltration membrane and excludes relatively large molecular weight than reverse osmosis membrane, and is used for desalination of seawater, discoloration of dye wastewater, treatment of wastewater containing metal, and replacement of reverse osmosis membrane. It has been developed and used in various ways, such as the removal of sulfate from seawater, and the exclusion molecular weight is divided into 200, 400, and 700 in its kind, and also used for its application such as pH, temperature range and materials for using organic solvents. There are various types and most of them are films of high molecular polymers, but are excluded by two principles: exclusion by molecular weight size and exclusion of ions by electrostatic interaction between membranes.

The determination of the exclusion of the solute dissolved in the salt solution is based on the reaction of the anion. The strength of the exclusion increases with the increase of the valence of the anion because the reaction by the membrane increases, and the cation must be electrically neutral. However, the same size as the anion is excluded, but decreases with the increase in the valence of the cation, and also affects the hydration.

For example, the exclusion of sulfate ions (SO ₄ ^-2 ) is considerably higher than the exclusion of chlorine ions (Cl ⁻ ), higher exclusion of sodium chloride (NaCl) than calcium chloride (CaCl ₂ ), and sodium nitrate (NaNO ₃ ). Is excluded because it is more hydrated in aqueous solution than sodium chloride (NaCl).

FIG. 3 is a view for explaining the function of the nanofiltration system. Raw water (W) flows into the nanofiltration system 13 so that organic matter and inorganic ions having a molecular weight do not penetrate the membrane 131, and the concentrated water pipe 132 Treated water is discharged into the concentrated solution storage tank 133, or fed back to the first collection tank (1), and the treated water passed through the separation membrane 131 is discharged through the treated water pipe 134, or a chemical treatment process or biological treatment Transferred to the process.

At this time, the quantity control of the concentrated water and the treated water is set by the pressure ratio of the concentrated water pipe 132 and the treated water pipe 134 to set the pressure of the concentrated water pipe 132 higher than the pressure of the treated water pipe 134. The pollution concentration of the treated water discharged through the main surface treated water pipe 134 is increased and conversely, the pollution concentration of the treated water is decreased by setting the pressure of the treated water pipe 134 lower than the pressure of the concentrated water pipe 132. .

[Examples 1 to 9]

8의 범위가 되도록 조정하여 인입압력 30kg/cm³로 하여 각기 다른 9가지의 폐수를 통과시킨 결과 하기의 표 1과 같은 결과를 얻었다.When the inflow of wastewater is 100 using a device composed of diatomaceous earth filter and nanofiltration as shown in FIG. 2, the amount of concentrated water is 40 and the amount of generated water is 60. Wastewater pH 6

Nine different kinds of wastewater were passed through the inlet pressure 30kg / cm ³ to adjust the range of 8 to obtain a result as shown in Table 1 below.

As can be seen from Table 1 above, the COD of the raw wastewater ranges from the lowest of 1,980ppm of Example 8 to the highest of 4,680ppm of Example 3, but from the lowest of 20ppm of Example 1, the COD of the treated water is examined. As the maximum 64 ppm of Example 5 is shown, the COD is considerably lowered, which can reduce the difficulty of chemical or biological treatment, and if necessary, reprocess by reverse osmosis or nanofiltration into industrial water. It can be reused, and in the case of concentrated water, the COD is significantly higher and the salt concentration is slightly higher, but the amount of concentrated water is remarkably small, so that it is possible to significantly reduce the cost of wastewater treatment and the like.

Therefore, the present invention has the advantage that it is possible to arbitrarily select and operate the treatment of wastewater according to the treatment process as shown in FIG.

4 is a process flow diagram showing an embodiment using the present invention, which can be used as shown in the drawings.

Wastewater introduced into the sump (1) is separated into wastewater containing sediment and suspended matter while waiting for a predetermined time, and the wastewater passes through the diatomaceous earth filter (11) by the action of a pump (P), The suspended solids are adsorbed on the diatomaceous earth and collected in the storage tank 12 to be temporarily stored. Then, the treated water entering the interior of the nanofiltration system 13 by the action of another pump P 'and passing through the separator 131 is If it is stored in the storage tank 19 through the treated water pipe 134 and needs to be reprocessed, it is passed through the reverse osmosis membrane separator 22 to reuse the treated water and the concentrated water is sent to the storage tank 14 for treatment or aerobic tank 4 ), After being sent to the anaerobic tank (5) and subjected to microbial treatment, separated into sediment and effluent in the separation tank (20), the sediment is compressed and packed with a compactor (17) together with the sediment separated from the collection tank (1), Effluent is intact Acids, or sent to reverse osmosis membrane separator 22 as needed, and reused again separated.

In addition, the concentrated water containing a large amount of organic and inorganic substances by the nano-filtration system 13 is returned to the collection tank (1) or stored in the storage tank (14) through the concentrated water pipe (132), the chemical in the chemical reaction tank (15) After being processed, it may be sent to the concentration tank 16, concentrated and dried, and then packaged and discarded.

In FIG. 4, reference numeral 18 denotes a dryer and 21 denotes a packaging machine.

According to the treatment method of the present invention that can be applied to other configurations other than the system diagram shown in FIG.

As described above, the present invention removes some organic matter and suspended solids through a filtration device by a physical method, and compares the treated water obtained through conventional chemical treatment and biological treatment by membrane separation by nanofiltration. COD and salinity can be adjusted to an unreasonable degree, and when treated water of desired concentration is obtained, the treated water itself can be discharged as it is, or reused as industrial water for dyeing or dye production, and the concentrated water is reduced in throughput. It will have the effect of reducing the processing cost.

Claims (1)

In the dye manufacturing process, the wastewater or the dyeing wastewater is treated, and the wastewater is passed through a diatomaceous earth filter 11, which is an adsorptive filter, to remove fine suspended matter particles and organic substances, and the like. Passed through the membrane separator 13 in which the nanofiltration membrane is installed, and separated into concentrated water containing a large amount of organic and inorganic ions and treated water from which the organic and inorganic ions are removed, and then concentrated from the membrane separator 13. The dye is fed back and recycled, and the treated water is subjected to a chemical treatment or a biological treatment again.

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