KR101030787B1 - Merging application apparatus and the method for dyeing waste-water and food waste-water using moving bed biofilm reactor - Google Patents

Abstract

PURPOSE: A merging and processing apparatus of food wastewater and dyeing wastewater and a method for the same are provided to reduce the generation amount of sludge by implementing a wastewater processing process without a primary pre-processing process. CONSTITUTION: A neutralizing tank(110) includes the inlet of dyeing wastewater and neutralizes the pH of the dyeing wastewater. A mixing part mixes the dyeing wastewater from the neutralizing tank and food wastewater. A dyeing wastewater supplying part further supplies dyeing wastewater from the neutralizing tank. A cover covers the entire mixing part and a part of the dyeing wastewater supplying part. A baffle slantly sprays the dyeing wastewater of the dyeing wastewater supplying part into the mixing part. A mixing unit(120) includes a storing tank in which mixed wastewater is stored. A reacting tank(130) processes the wastewater using aerobic microorganism. A coagulating tank(140) coagulates solid material of the processed wastewater. A precipitating tank precipitates the solid material.

Description

MERGEING APPLICATION APPARATUS AND THE METHOD FOR DYEING WASTE-WATER AND FOOD WASTE-WATER USING MOVING BED BIOFILM REACTOR}

The present invention relates to a method for biological treatment of wastewater, and more specifically, dyeing wastewater and food using a floating bed biofilm reactor (MBBR) in which a floating carrier is filled and microorganisms are attached to the surface of the carrier. The present invention relates to a merger treatment apparatus and a method for treating the wastewater more efficiently by treating the wastewater in which the wastewater is merged.

Dyeing wastewater is generally very complex, and the water quality fluctuates largely depending on the operation status of the work process, and includes dyes, auxiliary chemicals, PVA (Polyvinyl Alchol), starch, WAX, etc. In general, about 20% of the dyes used in the dyeing process are discharged into the waste water. These color-causing substances cause by-products not only through aesthetic appearance but also through hydrolysis or other chemical reactions.

The treatment process that is commonly used to treat these dyeing wastewaters is the first biological and chemical pretreatment (aggregation precipitation, fenton oxidation, pressurization, etc.) of raw water, and then the second biological treatment method (standard activated sludge method, Closed pure oxygen defoaming method, etc.) is used. However, these methods have faced limitations of final treatment efficiency along with excessive costs such as physical and chemical pretreatment costs, sludge treatment costs from chemical and biological treatment processes, and it is difficult to proactively cope with the strengthening domestic and international environmental regulations. It is true. As a result, increased environmental burdens on wastewater treatment are lowering the productivity and product competitiveness of domestic textile and dyeing processors. Therefore, there is an urgent need to develop a treatment technology that can improve treatment efficiency while drastically reducing operating costs, chemical costs, and sludge treatment costs, compared to conventional dyeing wastewater treatment processes.

In addition, the same problem occurs in various food waste recycling facilities, which is caused by the nature of food waste in Korea, the secondary environmental pollution caused by the generation of odor and a large amount of waste water. In particular, food wastewater is a high concentration of wastewater, which has become a major problem in resource treatment facilities, and has recently been recognized as a major source of pollution. Since the ban on direct landfilling, marine discharges, which are cheaper than land treatment of food wastewater, have soared. However, marine emissions of food waste treatment wastes, which are gradually increasing, have been tightened by the London Protocol 96 by restricting their emissions by reducing emissions and restricting solid concentrations annually. In particular, the development of a terrestrial treatment method for food wastewater is urgent due to the total ban on marine discharges from 2012.

Therefore, in order to solve the above problems, an object of the present invention is to reduce the operating costs such as chemical treatment chemical costs, sludge treatment costs by strengthening biological treatment instead of the conventional dyeing wastewater treatment process, the value of utilization as an alternative to land treatment of food wastewater It is to provide a combined treatment apparatus and method of dyeing wastewater and food wastewater to increase the.

In order to achieve the above object, the present invention is provided with an inlet for dyeing wastewater, a neutralization tank for neutralizing the pH of the dyeing wastewater; A mixing device for mixing the dyeing wastewater transferred from the neutralization tank with the food wastewater; And a reaction tank for treating the wastewater transferred from the mixing apparatus using a fluidized bed carrier having a biofilm, wherein the reactor is a fluidized bed biofilm reactor (MBBR) filled with a floating carrier. The present invention relates to a combined treatment apparatus of dyeing wastewater and food wastewater.

In the present invention, the mixing device includes a baffle installed at the inlet of the dyeing wastewater. In addition, in the present invention, the mixing device includes a reservoir for storing the mixed waste water to have a uniform property.

The present invention also includes an agglomeration tank and a precipitation tank for agglomeration and precipitation of solids of the treated water transferred from the reaction tank.

In the present invention, the reaction tank is a first aerobic reaction tank for treating the wastewater transferred from the mixing device first by using aerobic microorganisms, and the treated water transferred in the first aerobic reaction tank for secondary treatment using aerobic microorganisms It includes a second aerobic reactor.

The present invention comprises the first step of neutralizing the dyeing wastewater to pH 5.8 ~ 8.6 by introducing the dyeing wastewater into the neutralization tank; A second step of mixing food wastewater with the neutralized dye wastewater; A third step of treating the mixed wastewater using a moving bed biofilm reactor (MBBR) filled with a fluidized bed carrier having a biofilm; And a fourth step of coagulating and precipitating solids by adding a flocculant to the treated water, and discharging the final treated water.

In the present invention, the second step includes the step of storing the mixed waste water to be in a uniform shape. In the present invention, the third step is the first step of treating the wastewater transported by the mixing device using aerobic microorganisms; And secondly treating the first treated water using an aerobic microorganism.

The combined treatment system and method of dyeing wastewater and food wastewater according to the present invention is very biological treatment using fluidized biofilm carriers, unlike the conventional biological treatment process, despite the long residence time, the treatment efficiency of pollutants such as color is low. Because it occurs quickly, the residence time is short, and the food wastewater is merged to maintain an appropriate organic load so that the biofilm age (BRT) is young and the activity is good. Therefore, it is possible to reduce the scale of treatment facilities because of its high treatment efficiency even in short residence time, and it is possible to treat wastewater very quickly and economically. In addition, the present invention does not require the first pretreatment process by the existing flocculation can significantly reduce the amount of sludge generated, it is possible to immediately discharge without additional post-treatment if the discharge tolerance is satisfied only biological treatment.

1 is a view showing a combined treatment of dyeing wastewater and food wastewater according to an embodiment of the present invention.
2 is a view showing a mixing device of the dyeing wastewater and food wastewater of the apparatus of FIG.
Figure 3 is a flow chart showing a combined treatment method of dyeing wastewater and food wastewater according to an embodiment of the present invention.
4A and 4B are graphs showing the results of COD and chromaticity change when the dye wastewater is treated alone using the treatment method of the present invention.
5A and 5B are graphs showing the results of COD and chromaticity change when the dyeing wastewater and the food wastewater are treated by using the treatment method of the present invention.
6A and 6B are electron microscopy (SEM) images of the surface of the fluidized biofilm carrier when the dyeing wastewater using the treatment method of the present invention is treated alone and when the dyeing wastewater and the food wastewater are combined.
Figure 7a is a DGGE profile picture when the dyeing wastewater using the treatment method of the present invention alone and when the dyeing wastewater and food wastewater are combined treatment.
Figure 7b is a Dendrogram photograph of the case of treating the dyeing wastewater by using the treatment method of the present invention alone, and when the dyeing wastewater and food wastewater combined treatment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like numbers refer to like elements throughout the specification.

1 is a view showing a combined treatment device of the dyeing wastewater and food wastewater according to an embodiment of the present invention, Figure 2 is a view showing a mixing device for mixing the dyeing wastewater and food wastewater of the apparatus of FIG. Referring to FIG. 1, the merge processing apparatus 100 includes a neutralization tank 110, a mixing apparatus 120, a reaction vessel 130, and a coagulation tank 140.

The neutralization tank 110 is connected to the inlet of the dyeing wastewater, and neutralizes the dyeing wastewater to pH 5.6-8.6 by injecting H ₂ SO ₄ into the neutralization tank 110. The pH may be adjusted using H ₂ SO ₄ , but is not necessarily limited thereto. This is because the dyeing wastewater is mostly alkaline, so that it can be neutralized to neutral so that it can be treated biologically. As an example, the dyeing waste water is to use a COD 200 ~ 500ppm and chromaticity 500 ~ 2,000 [CU].

The mixing device 120 mixes the dye wastewater transferred from the neutralization tank 110 with the food wastewater. Mixing device 120 is to completely mix the food waste water 1 ~ 5% in the neutralized dye waste water within a short time to prevent the occurrence of odor. For example, the food waste water is COD 30,000 ~ 70,000ppm, BOD 30,000 ~ 90,000ppm, T-N 1,000 ~ 7,000ppm, T-P 1,000 ~ 2,000ppm, chromaticity 1,000 ~ 4,000 [C.U] will be used. The mixing device 120 is provided with a baffle 121 at the inlet of the neutralized wastewater. The baffle 121 prevents odor primarily by crossing the flow of the dye wastewater with the inflow pipe of the food wastewater. In addition, the odor that was not suppressed by the primary prevention device was allowed to have the same effect as the U-Trap by allowing the wastewater to always remain before the inflow of the dyeing wastewater. In addition, the mixing apparatus 120 includes a reservoir 122 for storing the mixed waste water to have a uniform property.

Reactor 130 is a fluid bed biofilm reactor (MBBR) in which the mixed wastewater is filled with a fluidized bed carrier to which a biofilm is attached. The reaction tank 130 decomposes the organic contaminants, nitrogen, and phosphorus contained in the hardly degradable contaminants contained in the dyeing wastewater and the food wastewater. At this time, the reaction tank 130 may be divided into two tanks, the first aerobic reaction tank 131, and the first aerobic reaction tank 131 for treating the wastewater transferred from the mixing device 120 to the first using aerobic microorganisms, and And a second aerobic reactor 132 for secondarily treating the treated water transferred from the aerosol using aerobic microorganisms. Depending on the pollutant loading of the mixed waste water, the reactor arrangement may be applied in the order of anaerobic reactor-aerobic reactor.

The agglomeration tank 140 adds a flocculant to the treated water transferred from the reaction tank 130 to agglomerate the solids, finally precipitate the solids in the settling tank 150 and discharge the final treated water. At this time, the final effluent should meet the discharge limit of 80ppm of BOD, 90ppm of COD, 60ppm of T-N, 8ppm of T-P and 400 [C.U] of chromaticity.

Figure 3 is a flow chart showing a combined treatment method of dyeing wastewater and food wastewater according to an embodiment of the present invention. Referring to Figure 3, the dyeing wastewater is introduced into the neutralization tank to neutralize the dyeing wastewater to pH 5.8 ~ 8.6 (S110). And the food waste water is mixed with the neutralized wastewater (S120). Mixing apparatus 120 includes a reservoir 122 for storing the mixed waste water to have a uniform properties. The mixing device 120 is connected to the food waste water transport pipe, and a transport pump for quantitatively transporting the food waste water is connected and installed.

In addition, the mixed wastewater is treated using a fluidized bed biofilm reactor (MBBR) filled with a fluidized bed carrier having a biofilm attached (S130). The carrier is a Poly Ethylene Module Type (PEMT) carrier carrying an inorganic material and a specific gravity control material to increase the specific surface area of the carrier surface and improve the adhesion of the biofilm. By using a biological process composed of two stages of aerobic reactor using a fluidized bed biofilm reactor having a biofilm attached to the surface of the carrier, treatment efficiency of contaminants can be improved. An air supply device for supplying air is installed at the bottom of the aerobic reaction tank, and a porous pipe for transporting the treated water while preventing the loss of the fluidized bed biofilm carrier is connected between the reaction tanks.

Finally, a flocculant is added to the treated water to aggregate and precipitate the solids, and the final treated water is discharged (S140).

Hereinafter, it demonstrates further in detail based on the Example of this invention. However, the following examples are for illustrating the present invention and the present invention is not limited to the following examples.

In the present invention, as in Example 1, the COD and chromatic treatment efficiency were compared when the dyeing wastewater was treated with PEMT fluidized bed biofilm carrier alone and when the food wastewater was treated with the dyeing wastewater at a constant ratio. For reference, Table 1 below shows the contaminant concentrations of the dye wastewater applied to the present invention, and Table 2 shows the concentrations of the food wastewater to be merged.

Dye Wastewater Contaminant Concentration division COD BOD SS Color T-N T-P Concentration (ppm) 200-500 200-500 100-300 500-2,000 15-30 1-2

Food Wastewater Contaminant Concentration division COD BOD SS Color T-N T-P Concentration (ppm) 30,000 ~ 70,000 30,000-90,000 10,000-30,000 1,000-4,000 1,000-7,000 1,000-2,000

(Comparative Example 1)

Single treatment of dyeing wastewater using PEMT fluidized bed biofilm

Contaminant concentration COD 200 ~ 500ppm, chromaticity 500 ~ 2,000 [C.U] applied to the present invention was treated using the apparatus of Figure 1 and the method of FIG. As a result of continuous analysis from seeding the microorganisms to the carrier by filling about 40% of the PEMT fluidized bed carrier in the volume ratio, each processing tank was found to take about 1 month to stabilize treatment efficiency. The treatment efficiency was observed by increasing the treatment load by decreasing the HRT. The COD and chromaticity analysis methods were based on the water pollution process test method, and the experimental results are shown in Table 3 and FIGS. 4A and 4B.

Dyeing wastewater treatment result according to the present invention division Influent Expiry 1 Expiry 2 Flocculation Final throughput COD (ppm) 339 167 130 86 - Removal rate - 50.7% 22.2% 33.8% 74.6% Chromaticity (C.U) 606 491 417 266 - Removal rate - 19.0% 15.1% 36.2% 56.1%

(1) COD processing efficiency

As shown in FIG. 4A, the concentration of the effluent is largely changed in conjunction with the influent from the first operation to the HRT 12 hours, which is mainly treated by suspended microorganisms similar to the activated sludge method because the biofilm is not yet completely implanted in the carrier. It can be seen that it is vulnerable to inflow fluctuations. After the initial unstable state, the concentration change of the influent was more than 100ppm, but the concentration of the effluent was observed to be constant. At this time, the test was carried out to increase the load by reducing the HRT to 4 hours, the removal rate of the aerobic tank 1 was lowered, while the removal rate of the aerobic tank 2 increased, it can be seen that the water quality of the final treated water is kept constant.

(2) chromatic processing efficiency

As shown in FIG. 4B, the color treatment efficiency is shown to be affected by the concentration of the influent, and it can be seen that the chromaticity greatly changes depending on the influent even when COD treatment efficiency is stabilized. In addition, in the case of chromaticity, it can be seen that the treatment efficiency drops sharply at less than 6 hours of HRT, and as shown by the post-aggregation efficiency, additional post-treatment such as coagulation treatment is necessary for stable treatment of chromaticity. .

(3) flocculation experiment

As shown in FIGS. 4A and 4B, in order to confirm the flocculation effect of the chemicals on the effluents having passed through the aerobic tanks _{1 and 2} , the flocculation experiment by the input concentration using the inorganic sulfate aluminum sulfate [Al ₂ (SO ₄ ) ₃ ]. As a result, as shown in Table 3, it showed additional treatment efficiency of about 30 ~ 40%, and the water quality of final discharged water was 86ppm of COD and 266 [CU] of chromaticity. In the case of the flocculation treatment, the treatment efficiency may vary depending on the type of the inorganic flocculant, and thus, the introduction of the flocculation treatment process that can be optimized for the biologically treated water may lead to better results than the tests conducted in the present invention.

(Comparative Example 2)

Combined treatment of dyeing wastewater and food wastewater using PEMT fluidized bed biofilm

Dye wastewater used in the experiment of Comparative Example 1 and food wastewater having a concentration of pollutants of COD 30,000 ~ 70,000ppm, BOD 30,000 ~ 90,000ppm, TN 1,000 ~ 7,000ppm, TP 1,000 ~ 2,000ppm, chromaticity 1,000 ~ 4,000 [CU] 3 was used in the experiment of Comparative Example 1 by mixing a certain ratio and the mixing apparatus shown in FIG.

PEMT fluidized bed carriers filled in each aerobic tank was performed in the same manner as in Experiment 1, and the aerobic tank in which the biofilm was already seeded in the carrier through the experiment of Comparative Example 1 was used for initial stabilization as in the experiment of Comparative Example 1. There was no need for a certain period of time, and the experiment was carried out for 8 and 12 hours of 6-12 hours of HRT, which was stable through the experiment. The COD and chromaticity analysis methods were based on the water pollution process test method, and the experimental results are shown in Table 4 and FIGS. 5A and 5B.

Combined treatment result of dyeing wastewater and food wastewater according to the present invention division Dye Wastewater Merged wastewater Expiry 1 Expiry 2 Final treatment COD (ppm) 369.6 502 107.7 81.7 86.8 Removal rate - - 78.5% 24.1% 82.7% Chromaticity (C.U) 669.2 672.0 474.2 432.1 399.7 Removal rate - - 29.4% 8.9% 40.5%

Table 4 and the merged results of FIGS. 5A and 5B are difficult to find the quantitative input conditions during the merged treatment experiment due to the high solids content of the food wastewater, went through a lot of trial and error, abnormal data appeared in the trial and error process It is noted that is excluded from the data calculation to demonstrate the present invention.

(1) COD processing efficiency

As shown in Table 4 and FIG. 5A, the COD treatment efficiency through the merged treatment was almost constant regardless of the aerobic HRT (8 hours, 12 hours) for the final treated water, and for the biofilm treated water performed in the experiment of Comparative Example 1 Even though the flocculation process was not performed, the average concentration was about 87 ppm, which is a level that can comply with the emission limit standard only by treatment with biofilm. This suggests that food wastewater containing a high organic content is incorporated into dyed wastewater containing a large amount of hardly degradable contaminants, thereby providing a sufficient source of microorganisms, thereby ensuring species diversity of the microorganisms and increasing the number of populations significantly. And 6b, experiments on microbial state changes as shown in Figures 7a and 7b.

(2) chromatic processing efficiency

As shown in Table 4 and FIG. 5B, the color treatment efficiency through the merge treatment is similar to the COD, and the average concentration of the final treated water appears to be able to comply with the emission limit standards only by treatment with the biofilm. It is necessary to remove chromaticity additionally through post-treatment such as coagulation treatment for stable treatment.

For DNA extraction and DGGE analysis, about 50 carriers in the fluidized bed biofilm reactor were added in a 500 ml flask, 50 ml of distilled water was added, and then stirred in a flask to remove microorganisms from the media. Came out.

The microorganisms were removed from the carrier and the solution was centrifuged to separate the microorganisms, and the DNA of the microorganism was extracted using a DNA Extraction kit (PowerSoil DNA isolation kit, MO BIO Laboratories, USA). The extracted DNA was stored at -20 ° C. It was. DNA extracted from the sample was subjected to PCR (Polymerase Chain Reaction) for eubacteria, sterile water 10X reaction buffer, dNTP, primer (1 / ㎛ each) eub341F (5'-CCTACGGGAGGCAGCAG-3 ') and eub518R (5'- ATTACCGCGGCTGCTGG-3 '), PCR was performed by injecting 2ul of DNA template per 25ul of PCR solution containing Taq polymerase (iCycler iQ thermocycler, Bio-Rad Laboratories, United States).

When all the bands were identified, the GC 341F and eub518R with GC clamp (5'-CGCCCGCCGCGCGCGGCGGGCGGGGCGGGGGCACGGGGG-3 ') were used for the DGGE experiment. PCR was performed again under the same conditions. PCR conditions are shown in Table 5. PCR products were purified using a PCR purification kit (Solgent Co Ltd., Korea).

PCR conditions for DGGE Primer PCR Conditions eub34F / eub518R 120sec at 95 ℃, followed by 30 cycle 20sec at 95 ℃. 40sec at 61 ℃ and 30sec at 72 ℃, followed by 180sec fin extension at 72 ℃

DGGE was performed using the D-code ^™ system (Bio-Rad Laboratories, United States). A urea gel with 35-60% gradient was prepared and electrophoresed at 20 ° C. for 20 V 15 min and 200 V 360 min. Both markers used a 1kbp DNA ladder. After the reaction, the gel was dyed for 30 min using SYBR GOLD, and UV bands were used to check bands. Each band was cut with a sterilized knife and placed in a 1.5ml tube. Each band was washed with sterile water and then injected with TE buffer. The sample was stirred, centrifuged, and then repeated 15 min in a -80 ° C. refrigerator for 15 min and 60 min in a water bath, followed by PCR using eub 341 and 518R. PCR products were identified, and sequence sequences were determined using a sequencer (ABI 3730 XL DNA sequencer, Applied Biosystems, USA). The analyzed sequences were compared using NCBI's BLAST program.

Figure 7a is a band profile after PCR-DGGE analysis using the dyeing wastewater single treatment aerobic sample and each dyeing wastewater and food wastewater aerobic sample for each reaction tank. In FIG. 7A, lanes A and B represent the first and second stages of the united treatment of the dyeing wastewater treatment process, and E and F lanes represent the samples of the first and second stages of the combined treatment process of the dyeing wastewater and food wastewater. In A and B lanes, there was no significant difference in the DGGE band profile, but a faint band was observed in A lane. It is confirmed that there is no difference in cluster diversity. In consideration of the DGGE band profile of FIG. 7A, the group diversity of the microorganisms in the first stage and the second stage of the aerobic treatment did not show a significant difference, but when comparing the single treatment and the merge treatment with each other, I noticed a significant difference in my microbial community.

Figure 7b shows the fingerprinting analysis software (Fingerprinting II Informatix ^TM based on the band profile of the DGGE analysis result Software, Bio-Rad Laboratories, Inc.). The correlation coefficient used in the schematic was calculated using the Dice correlation method. In the flow chart prepared in consideration of the intensity of each band, the 1st and 2nd stages of dyeing wastewater combined treatment showed 100% similarity, and the similarity of the reactor microbial community in the single treatment and the combined treatment was about 40%.

 Although the present invention has been described above with reference to the embodiments, it will be understood by those of ordinary skill in the art that the present invention may be variously modified and changed without departing from the spirit and scope of the present invention. I can understand. Therefore, the present invention is not limited to the above-described embodiments, and the present invention will include all embodiments within the following claims.

The present invention can be widely applied to the field of wastewater treatment, such as the treatment of industrial wastewater and high-efficiency wastewater, as well as non-degradable industrial wastewater treatment including dyeing wastewater.

100: merge processing device
110: Chinese tank
120: mixer
121: baffle
122: reservoir
130: reactor
131: first aerobic reactor
132: second aerobic reactor
140: flocculation tank
150: sedimentation tank

Claims (8)

A neutralization tank having an inlet for dyeing wastewater and neutralizing the pH of the dyeing wastewater;
The dyeing waste water transported from the neutralization tank and the food waste water are mixed with each other while being mixed in the air, and the dyeing waste water transported from the neutralization tank is surrounded by the upper outer peripheral surface of the mixing unit. The dyeing wastewater supply unit is additionally supplied and the outer wall is provided higher than the inner wall, which is the upper end of the mixing portion, and covers the entire mixing portion and a portion of the dyeing wastewater supply portion, the lower end of which is lower than the inner wall; A baffle toward the mixing portion while forming a sloped surface with respect to the inner wall so that the dyeing waste water supply portion of the dyeing waste water is injected obliquely into the mixing portion, and a storage tank for storing the mixed waste water so as to have a uniform property. Mixing device;
Treating the mixed wastewater transported from the mixing apparatus using a fluidized bed biofilm carrier having a biofilm attached thereto, the first aerobic reactor and the treated water transferred from the first aerobic reactor to aerobic microorganisms. Reactor comprising a second aerobic reactor for the second treatment using;
An agglomeration tank for agglomerating solids of the treated water transferred from the reaction tank; And
Including a precipitation tank for precipitating the solidified in the flocculation tank,
The reactor is a fluidized bed biofilm reactor (MBBR) filled with a floating carrier, the dyeing wastewater and food wastewater combined treatment apparatus. delete delete delete delete delete delete delete

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