A high-cod yellow water distillation waste liquid pretreatment device

Abstract

The utility model discloses a kind of high COD yellow water distillation waste liquid pretreatment device, belong to sewage treatment technical field.The high COD yellow water distillation waste liquid pretreatment device includes sedimentation tank;Iron-carbon reaction device, the iron-carbon reaction device with the sedimentation tank is connected, inside is provided with aeration device and iron-carbon filler;Alkaline hydrolysis reactor, the alkaline hydrolysis reactor with the iron-carbon reaction device is connected;Neutralization tank, the neutralization tank with the alkaline hydrolysis reactor is connected;Mixer, the alkaline hydrolysis reactor and the neutralization tank inside are equipped with the mixer.The treatment is carried out by iron-carbon micro-electrolysis-fenton-alkaline hydrolysis composite process, can effectively solve the problem that yellow water distillation waste liquid discharged during brewing in prior art is difficult to handle, processing efficiency is low, cost is high, its water resource consumption ratio can be controlled at 1:5~1:10.When reagent delivery amount and dilution water amount are greatly reduced, the concentration of COD, total phosphorus and other pollutants in yellow water distillation waste liquid discharged during brewing can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to a pretreatment device for high COD yellow water distillation waste liquid, belonging to the field of wastewater treatment technology. Background Technology

[0002] In industrial production, such as liquor brewing, high-COD yellow wastewater is generated during large-scale brewing. Each ton of liquor production produces approximately 12-15 tons of distiller's grains wastewater, with typical wastewater such as cellar bottom water and yellow wastewater exhibiting peak COD concentrations exceeding 150,000 mg / L, far exceeding the limits in the "Emission Standard for Water Pollutants from Fermented Alcohol and Liquor Industry" (direct COD ≤ 50 mg / L). -1 Indirect emissions ≤100mg·L -1 The contradiction between high pollution loads and strict standards is particularly acute.

[0003] Solid-state brewing produces a large volume of yellow wastewater, which contains complex pollutants such as sugars, esters, and heterocyclic compounds, exhibiting high COD and low biodegradability. This makes biodegradation difficult and slow, easily causing activated sludge to disintegrate. In addition, it also has characteristics such as high volatility, high color, and high colloidal content, which means that existing treatment processes rely on complex procedures to achieve compliance. This results in high initial construction costs and subsequent operating costs, which contradicts the "pollution reduction and carbon reduction" strategy, trapping enterprises in a dilemma of "inefficient treatment - high costs - resource waste".

[0004] The treatment efficiency of mainstream catalytic oxidation processes at home and abroad for distilled wastewater (COD concentration between 50,000 and 170,000 mg / L) is significantly limited. The core obstacle stems from a dual mechanism: on the one hand, high concentrations of organic matrix can easily lead to rapid saturation of catalyst active sites and induce free radical quenching effects, causing the oxidation efficiency to drop by more than 40% compared to medium and low concentration wastewater; on the other hand, the viscosity caused by high osmotic pressure (such as high concentrations of inorganic salt ions and sugars) and colloidal substances (such as pectin and soluble starch) in the wastewater will destroy and hinder the formation of activated sludge flocs, causing the sludge settling index (SVI) to rise sharply from the conventional value of 100 mL / g to more than 250 mL / g, which seriously deteriorates the solid-liquid separation efficiency.

[0005] Furthermore, the high concentration of macromolecular organic matter and substances with low biodegradability (low B / C ratio) in the yellow water (such as aldehydes, esters, higher fatty acids, and large protein molecules) will directly increase the reagent dosage in the catalytic oxidation treatment unit. Simultaneously, these substances are difficult for microorganisms to metabolize and utilize: on the one hand, they cannot effectively serve as carbon and energy sources for heterotrophic microorganisms, leading to an imbalance in the carbon source supply of the biochemical system; on the other hand, some substances (such as higher fatty acids and aldehydes) can significantly inhibit microbial metabolic activity, reducing the COD removal rate of subsequent biochemical treatment units. This will prolong the hydraulic retention time and further increase operating costs.

[0006] Existing technologies for treating this type of wastewater have the following main drawbacks: While direct dilution alleviates toxicity inhibition by reducing pollutant concentration, its water consumption ratio is as high as 1:15 to 1:50, and it requires the additional addition of nitrogen and phosphorus nutrients (C:N:P adjusted to 100:5:1) to maintain the balance of the biological system, leading to a 3-5 fold increase in treatment scale and associated resource waste; while multiple Fenton oxidation processes can achieve COD removal rates of 20% to 40%, they are limited by Fe... 2+ The dosage (typically 1-3 g / L FeSO4: 1 g / L COD) and H2O2 utilization rate (<40%, typically 1-1.5 mL / L: 1 g / L COD) not only increase unit energy consumption but also cause secondary pollution and disposal problems due to the generated iron sludge. Moreover, both types of processes face the problem of high operating costs in the later stage, causing enterprises to be caught in a double dilemma of efficiency and environmental protection. Utility Model Content

[0007] To address the aforementioned problems, this utility model provides a pretreatment device for high-COD yellow water distillation waste liquid. This device can treat the waste liquid through a composite process of iron-carbon micro-electrolysis-Fenton-alkali hydrolysis, effectively solving the problems of difficulty in treating, low treatment efficiency, and high cost of yellow water distillation waste liquid discharged during brewing in existing technologies.

[0008] This utility model is achieved through the following technical solution: This utility model provides a pretreatment device for high COD yellow water distillation waste liquid, comprising: Sedimentation tank; An iron-carbon reaction device is provided, which is connected to the sedimentation tank and is equipped with an aeration device and iron-carbon packing material inside. An alkaline hydrolysis reactor, which is connected to the iron-carbon reaction device; Neutralization tank, which is connected to the alkaline hydrolysis reactor; A stirrer is installed in both the alkaline hydrolysis reactor and the neutralization tank.

[0009] In one embodiment of this utility model, a first reagent tank and a second reagent tank are connected to one side of the iron-carbon reaction device, and the first reagent tank and the second reagent tank add reagents to the iron-carbon reaction device through a first diaphragm pump.

[0010] In one embodiment of this utility model, a feeding device and a third reagent tank are sequentially connected to one side of the alkaline hydrolysis reactor, and the feeding device is a screw dosing pump.

[0011] In one embodiment of this utility model, a first detection device is provided inside the alkaline hydrolysis reactor.

[0012] In one embodiment of this utility model, a second diaphragm pump and a fourth reagent tank are sequentially connected to one side of the neutralization tank, and a second detection device is also provided inside the neutralization tank.

[0013] In one embodiment of this utility model, a filter and a first sewage pump are connected to the side of the sedimentation tank away from the iron-carbon reaction device, and a greywater tank and a water storage tank are connected to the side of the filter away from the sedimentation tank.

[0014] In one embodiment of this utility model, a second sewage pump is provided between the sedimentation tank and the iron-carbon reaction device, a third sewage pump is provided between the iron-carbon reaction device and the alkaline hydrolysis reactor, and a fourth sewage pump is provided between the alkaline hydrolysis reactor and the neutralization tank.

[0015] In one embodiment of this utility model, it further includes a sludge tank and a wastewater treatment plant, wherein the bottom of the filter, sedimentation tank and alkaline hydrolysis reactor are connected to the sludge tank, and the neutralization tank is connected to the wastewater treatment plant.

[0016] In one embodiment of this utility model, the sedimentation tank and the iron-carbon reaction device are made of corrosion-resistant materials.

[0017] In one embodiment of this utility model, the iron-carbon filler is a microporous iron-carbon alloy filler, the particle size of the iron-carbon filler is 3-5 cm, and the porosity of the iron-carbon filler is greater than 65%.

[0018] Beneficial effects 1. The high-COD yellow distillation waste liquid pretreatment device provided by this utility model adopts a composite process of iron-carbon micro-electrolysis-Fenton oxidation-alkaline hydrolysis for pretreatment, which can effectively solve the technical bottlenecks of difficult degradation, low treatment efficiency, and high operating costs in the existing treatment of yellow distillation waste liquid in the brewing industry. The wastewater dilution water resource consumption ratio (treatment water volume: dilution water volume) of this device can be controlled at 1:5~1:10, and the total reagent dosage is reduced to 2‰~5‰ compared with the traditional Fenton oxidation process. Under the premise of significantly reducing the reagent dosage and dilution water volume, the concentration of characteristic pollutants such as COD and total phosphorus in yellow distillation waste liquid can still be significantly reduced. After treatment by this device, the COD removal rate of waste liquid can reach more than 32.1% (corresponding to a COD concentration reduction of 2.5×10). 4 ~3×10 4 The total phosphorus removal rate can reach over 84.18% (mg / L); at the same time, it can significantly improve the biodegradability of wastewater (increase the B / C ratio), laying a good foundation for the stable operation of subsequent biological treatment units.

[0019] 2. This pretreatment device exhibits excellent resistance to shock loads on the yellow distillation wastewater discharged from the brewing industry, even when the COD concentration of the wastewater is as high as 8×10⁻⁶.4 ~1×10 5 Even under high load conditions of mg / L, it can still maintain stable operation and achieve effective removal of pollutants. Compared with existing technologies such as traditional Fenton oxidation and biofilm treatment, this device has significantly improved tolerance to high-concentration organic wastewater and can adapt to the industry characteristics of large fluctuations in the quality of brewing wastewater.

[0020] 3. This device generates Fe in situ during micro-electrolysis using iron-carbon filler. 2+ This provides catalytically active components for the subsequent Fenton oxidation reaction, significantly reducing exogenous Fe. 2+ The dosage is reduced, thereby lowering the amount of chemical sludge produced and the cost of reagents. Simultaneously, no chemical flocculants such as polyacrylamide are added throughout the process, effectively avoiding the risk of secondary pollution caused by reagent residues. Furthermore, quicklime (CaO) is used as the alkali adjusting agent in the alkaline hydrolysis unit, and its raw material cost is significantly lower than that of conventional alkali agents such as sodium hydroxide. Analysis of the overall operating characteristics shows that this composite process has the advantages of low chemical sludge production, low dilution water cost, and high reagent utilization efficiency; moreover, the treatment process is simple, the device structure is rationally designed, operation is convenient, and maintenance and management are low, demonstrating good prospects for practical engineering application and promotion. Attached Figure Description

[0021] Figure 1 A schematic diagram of the high COD yellow water distillation waste liquid pretreatment device provided by this utility model.

[0022] In the picture: 1. Filter; 2. First sewage pump; 3. Sedimentation tank; 4. Aeration device; 5. Iron-carbon reaction device; 6. First reagent tank; 7. Second reagent tank; 8. First diaphragm pump; 9. Second sewage pump; 10. Third sewage pump; 11. Alkali hydrolysis reactor; 12. First detection device; 13. Feeding device; 14. Third reagent tank; 15. Fourth sewage pump; 16. Second detection device; 17. Second diaphragm pump; 18. Fourth reagent tank; 19. Neutralization tank; 20. Greywater tank; 21. Water storage device; 22. Sludge tank; 23. Sewage treatment plant; 24. Mixer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] like Figure 1 As shown, this application provides a pretreatment device for high COD yellow water distillation waste liquid. This pretreatment device can not only save water resources and reduce resource input, but also generate iron ions through an iron-carbon reaction device, solving the problem of insufficient iron ion dosage, thereby improving treatment efficiency.

[0027] In some embodiments, the high-COD yellow water distillation waste liquid pretreatment device includes a sedimentation tank 3, an iron-carbon reaction device 5, an alkaline hydrolysis reactor 11, and a neutralization tank 19. The sedimentation tank 3 is connected to the iron-carbon reaction device 5. The alkaline hydrolysis reactor 11 is installed on the side of the iron-carbon reaction device 5 away from the sedimentation tank 3 and is connected to the iron-carbon reaction device 5. The neutralization tank 19 is located on the side of the alkaline hydrolysis reactor 11 away from the iron-carbon reaction device 5 and is connected to the alkaline hydrolysis reactor 11. A filter 1 and a first sewage pump 2 are provided on the side of the sedimentation tank 3 away from the iron-carbon reaction device 5. One end of the filter 1 is connected to the sedimentation tank 3 through the first sewage pump 2. A greywater tank 20 and a water storage device 21 are connected to the side of the filter 1 away from the first sewage pump 2. The water storage device 21 is used to store the high-concentration yellow wastewater to be treated. The greywater in the greywater tank 20 and the high-concentration yellow wastewater in the water storage device 21 are transported to the filter 1 in a certain proportion and then pumped into the sedimentation tank 3 through the first sewage pump 2.

[0028] In some embodiments, the sedimentation tank 3 and the iron-carbon reaction device 5 are connected by a second sewage pump 9. After preliminary separation and sedimentation in the sedimentation tank 3, the sewage enters the iron-carbon reaction device 5 through the second sewage pump 9. The iron-carbon reaction device 5 is equipped with an aeration device 4, which is a microbubble aeration pipe connected to a high-power blower via a microbubble aeration supply pipe. The iron-carbon packing material is supported above the aeration device 4 by an iron-carbon support platform. The reagent addition device includes a first reagent tank 6 and a second reagent tank 7, which store ferrous sulfate reagent and hydrogen peroxide, respectively. A first diaphragm pump 8 is installed between the first and second reagent tanks 6 and the iron-carbon reaction device 5, pumping the reagents from the first and second reagent tanks 6 and 7 into the iron-carbon reaction device 5, enabling accurate addition of reagents. The top of the iron-carbon reaction device 5 is equipped with an internal circulation outlet and a reagent addition port, and the bottom is equipped with an inlet and a drain outlet. The top outlet is connected to the bottom inlet through a pipe, and the bottom drain outlet is connected to the alkaline hydrolysis reactor 11 through a pipe.

[0029] In some embodiments, a third wastewater pump 10 is provided between the alkaline hydrolysis reactor 11 and the iron-carbon reaction device 5. The third wastewater pump 10 can pump the wastewater after the reaction in the iron-carbon reaction device 5 into the alkaline hydrolysis reactor 11 for treatment. An agitator 24 is installed inside the alkaline hydrolysis reactor 11 to ensure more uniform mixing of the wastewater and reagents. A first detection device 12 is also installed inside the alkaline hydrolysis reactor 11 to detect the pH value of the wastewater inside the alkaline hydrolysis reactor 11. One end of the alkaline hydrolysis reactor 11 is connected in sequence to a feed device 13 and a third reagent tank 14 via a pipe. The feed device 13 is a screw dosing pump, connected to the top of the alkaline hydrolysis reactor 11 via a pipe, and can add the reagents from the third reagent tank 14 into the alkaline hydrolysis reactor 11. The bottom of the alkaline hydrolysis reactor 11 is equipped with a pipe and a sludge pump. The end away from the alkaline hydrolysis reactor 11 is connected to a sludge tank. The sludge pump can suck the sludge settled at the bottom into the sludge tank 22. The bottoms of the filter 1 and the sedimentation tank 3 are also connected to the sludge tank 22 through pipes and sludge pumps, which can pump the sludge at the bottom of the filter 1 and the sedimentation tank 3 into the sludge tank 22.

[0030] In some embodiments, a fourth wastewater pump 15 is installed between the alkaline hydrolysis reactor 11 and the neutralization tank 19. The clarified water in the alkaline hydrolysis reactor 11 is transported to the neutralization tank 19 via the fourth wastewater pump 15. A second detection device 16 is installed in the neutralization tank 19 to detect the pH value within the neutralization tank 19. A second diaphragm pump 17 and a fourth reagent tank 18 are connected to the top of the neutralization tank 19 via pipes. The fourth reagent tank 18 delivers reagents into the neutralization tank 19 through the second diaphragm pump 17 and the pipes to adjust the pH value within the neutralization tank 19. A stirrer 24 is also installed in the neutralization tank 19 to ensure more uniform mixing of the wastewater and reagents. A pipe and a water pump are installed at the bottom of the neutralization tank 19, and the water pump connects to the wastewater treatment plant 23. The adjusted wastewater is then transported to the wastewater treatment plant 23 via the pipes and the water pump.

[0031] Optionally, both the first detection device 12 and the second detection device 16 are pH probes, capable of detecting the pH value in the alkaline hydrolysis reactor 11 and the neutralization tank 19 in real time.

[0032] Furthermore, both the sedimentation tank 3 and the iron-carbon reaction device 5 are acid-resistant reaction vessels or reaction pools, and the materials can be fiberglass or carbon steel lined with anti-corrosion materials.

[0033] Furthermore, in sedimentation tank 3, the yellow distillation waste liquid is adjusted with clean water or reclaimed water. The initial pH value of the wastewater is about 2.8-3.5. The yellow distillation waste liquid discharged during brewing is diluted with clean water at a volume ratio of 1:0.5-1:1, so that the COD of the diluted wastewater is about 80,000-100,000 mg / L and the pH value is about 3.0-3.7. The pH value can be adjusted with hydrochloric acid or sodium hydroxide. This process can control the pH of the influent and increase the wastewater treatment capacity.

[0034] Furthermore, the iron-carbon reaction device 5 uses a novel structured microporous iron-carbon alloy packing material, which is a mixture of iron powder (75%±5%), carbon powder (10%-15%), catalyst (5-7%), and activator (approximately 3%) in a certain proportion, with a physical strength greater than 900 kg / m³. 3 The porosity is greater than 65%, and the iron-carbon packing particle size is 3-5 cm. After the yellow water distillation waste liquid enters the iron-carbon reactor 5, a ferrous sulfate heptahydrate solution is pumped in, controlling the final concentration to 3.25 g / L. Simultaneously, hydrogen peroxide (30%) is added at a rate of 6-9.5 mL / L (the amount can be adjusted appropriately based on the COD and hydrogen peroxide reagent concentration). The wastewater retention time is approximately 24-48 hours. During the reaction, the wastewater is circulated and aerated via a second wastewater pump 9 and an aeration device 4, with an aeration rate of 0.5 m³ / L. 3 / (m 3 •h), the sewage circulation flow rate is 0.5m³. 3 / (m 3•h), the reaction temperature is room temperature (20-30℃). This internal circulation can significantly extend the service life of iron-carbon packing, reduce the probability of packing caking and clogging, and accelerate the catalytic oxidation reaction to degrade organic matter in wastewater.

[0035] Furthermore, the alkaline hydrolysis reactor 11 is an alkali-resistant stirred tank reactor, made of carbon steel lined with rubber or polyethylene, with a volume determined according to the actual treatment capacity. Quicklime (CaO) is added to the wastewater after iron-carbon micro-electrolysis simultaneous Fenton treatment to raise the pH value of the wastewater to 11-11.5 (the addition amount is approximately 3-8 g / L). The reaction time is 24-48 hours. During the reaction, the mixture is stirred by a mixer 24 at a stirring speed of 100-200 r / min to improve the reaction rate and alkaline hydrolysis rate. The reaction temperature is room temperature (20-30℃). After the reaction is completed, stirring is stopped and sedimentation is carried out. The settled sludge and clear water are pumped out and treated by a sludge pump and a fourth sewage pump 15.

[0036] Furthermore, the neutralization tank 19 is an alkali-resistant stirred tank reactor, made of carbon steel lined with rubber or polyethylene, with a volume determined according to the actual treatment capacity. A 3-7 mol / L hydrochloric acid solution is added to the clarified water treated by the alkaline hydrolysis reactor 11 to adjust the wastewater pH to approximately 7.

[0037] The working principle of this invention is as follows: High-concentration wastewater is stored in a water storage device 21 and mixed with reclaimed water in a reclaimed water tank 20 at a certain ratio. It is then pumped to a sedimentation tank 3 via a filter 1 and a first wastewater pump 2 for dilution and sedimentation. The diluted and sedimented wastewater is then pumped to an iron-carbon reactor 5 via a second wastewater pump 9. The second wastewater pump 9 and an aeration device 4 circulate wastewater and oxygenate the iron-carbon reactor. Ferrous sulfate and hydrogen peroxide are added to the iron-carbon reactor 5 via a first reagent tank 6 and a second reagent tank 7 to accelerate the catalytic oxidation reaction and degrade organic matter in the wastewater. The wastewater treated by the iron-carbon reactor is then pumped to an alkaline hydrolysis reactor 11 via a third wastewater pump 10. Quicklime is added to the alkaline hydrolysis reactor 11 via a third reagent tank 14 and a feeding device 13 to raise the pH value of the wastewater. A stirrer 24 further enhances the reaction rate and alkaline hydrolysis rate. After the reaction, stirring is stopped, and sedimentation occurs. The clear liquid enters a neutralization tank 19 via a fourth wastewater pump 15, while the settled sludge is pumped into a sludge tank 22. The fourth reagent tank 18 contains acidic reagents. These reagents are added to the neutralization tank 19 via the second diaphragm pump 17 and stirred evenly by the agitator 24, adjusting the pH of the clarified liquid in the neutralization tank 19 to approximately 7. Through the synergistic effect of the iron-carbon micro-electrolysis-Fenton process and the alkaline hydrolysis process, the concentrations of pollutants such as COD and total phosphorus in the yellow distillation wastewater discharged during brewing can be effectively reduced. After treatment, the COD removal rate can reach over 32.1% (a reduction of 25,000-30,000 mg / L), and the total phosphorus removal rate can reach over 84.18%. Furthermore, the biodegradability of the wastewater is significantly improved, creating favorable conditions for subsequent biological treatment.

[0038] Example 1 Subject of treatment: Yellow water produced in a liquor brewing workshop. After distillation to extract alcohol, the yellow water discharged has a COD of 155,000 mg / L, ammonia nitrogen of 1680 mg / L, total phosphorus of 1480 mg / L, total nitrogen of 5300 mg / L, and a pH of 3.4.

[0039] Processing procedure: The high-concentration yellow distillation waste liquid discharged during brewing is diluted with 50L of water. The diluted wastewater is then transferred to sedimentation tank 3 through basket filter 1 and first sewage pump 2. After the liquid stabilizes, it is pumped into iron-carbon reaction device 5 through second sewage pump 9. The reaction tank should be filled with about 40L of new regular microporous iron-carbon alloy packing material.

[0040] Then, using the first diaphragm pump 8, 81.3g of ferrous sulfate heptahydrate aqueous solution and 275mL of 7.9% hydrogen peroxide are added from the first reagent container 6 and the second reagent container 7 into the iron-carbon reaction apparatus 5. During the reaction, the aeration device 4 aerates the solution at a rate of 0.5m... 3 / (m 3Aeration is carried out at an aeration rate of 0.5 m / h, while the effluent valve of sedimentation tank 3 is closed, and the second sewage pump 9 is used at an aeration rate of 0.5 m / h. 3 / (m 3 The reaction was carried out at a rate of 100 mg / L (h), with a reaction time of 24 hours. After the reaction, the COD of the wastewater decreased to 69360 mg / L.

[0041] The wastewater is transferred to the alkaline hydrolysis reactor 11 using the third wastewater pump 10. Approximately 0.25 kg of quicklime from the third reagent tank 14 is added to the reactor using the feeding device 13. The pH value of the wastewater in the alkaline hydrolysis reactor 11 is monitored using the first detection device 12, raising the pH value to approximately 11.5. The mixture is stirred at a speed of 150-200 r / min using a mixer 24, and the reaction time is 24 hours. After the reaction is complete, stop stirring for 2-4 hours to allow impurities to settle. The wastewater above is pumped into the neutralization tank 19 using the fourth wastewater pump 15. The solution in the fourth reagent tank 18 is pumped into the neutralization tank 19 using the second diaphragm pump 17. The stirrer 24 stirs at a speed of 150-200 r / min. The pH value in the neutralization tank 19 is detected by the second detection device 16, and the pH value of the wastewater is adjusted to 6.5-7.5. At this time, the COD of the wastewater drops to 59136 mg / L (removal rate of 32.1%), the ammonia nitrogen removal rate is 26.51%, the total phosphorus removal rate is 84.18%, and the total nitrogen removal rate is 18.56%.

[0042] Example 2 This application also provides a method for treating yellow wastewater. All other conditions are the same as in Example 1. After the wastewater treated in Example 1 is diluted 5 times again with recycled water, aerobic activated sludge water with a volume equal to that of the wastewater is added at a 1:1 ratio. After aerobic fermentation for 4 hours, the COD of the wastewater drops to 890 mg / L, with a COD removal rate of 71.30%, an ammonia nitrogen removal rate of 37.31%, a total phosphorus removal rate of 96.88%, and a total nitrogen removal rate of 56.87%.

[0043] The data above shows that after the wastewater treated in Example 1 was treated again by the aerobic process, the COD removal rate and total nitrogen removal rate of the wastewater were significantly improved, and the biodegradability of the wastewater was significantly improved (B / C ratio was improved), laying a good foundation for the stable operation of the subsequent biological treatment unit.

[0044] Comparative Example 1 Comparative Example 1 used existing aerobic activated sludge treatment technology. The wastewater was diluted with distilled yellow water at a ratio of 1:24 to recycled water. After adjusting the pH to 7 with sodium hydroxide, aerobic activated sludge water with a volume equal to that of wastewater was added at a 1:1 ratio. After 4 hours of aerobic fermentation, the COD of the wastewater decreased to 2463 mg / L, with a COD removal rate of 20.5%, an ammonia nitrogen removal rate of 85.48%, a total phosphorus removal rate of 95.27%, and a total nitrogen removal rate of 28.6%.

[0045] Comparative Example 2 Comparative Example 2: The Fenton process was used alone to treat the yellow water distillation waste liquid. The yellow water distillation waste liquid was diluted with water at a ratio of 1:49. Ferrous sulfate heptahydrate solution (3.25 g / L) was added, and the reaction was allowed to proceed for 30 min. Then, hydrogen peroxide (7.9%, 1.1 ml / L concentration) was added, and the reaction was allowed to proceed for 2 h. The pH was adjusted to between 6 and 8 using NaOH, and PAM (0.05 g / L) was added for flocculation, sedimentation, and filtration. The COD removal rate of the wastewater was 17.95%. The ammonia nitrogen removal rate was -87.97%, the total phosphorus removal rate was 90.88%, and the total nitrogen removal rate was 18.56%. The results are shown in Table 1.

[0046] Table 1. Statistical Table of COD, Ammonia Nitrogen, Total Phosphorus, and Total Nitrogen Removal Rates

[0047] As can be seen from the above embodiments, the verification experiments conducted by this utility model patent compared with the Fenton treatment process and the aerobic activated sludge treatment process show that the process of this utility model patent can effectively treat the high-concentration yellow water distillation waste liquid discharged during brewing, while saving a large amount of dilution water and improving the biodegradability of wastewater, and has good treatment effect and application prospects.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

[0050] This document uses specific embodiments to illustrate the principles and implementation methods of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A pretreatment device for high-COD yellow water distillation waste liquid, characterized in that, include: Sedimentation tank (3); Iron-carbon reaction device (5), which is connected to the sedimentation tank (3), and is equipped with an aeration device (4) and iron-carbon packing material inside; An alkaline hydrolysis reactor (11) is connected to the iron-carbon reaction device (5); Neutralization tank (19), which is connected to alkaline hydrolysis reactor (11); The agitator (24) is installed in both the alkaline hydrolysis reactor (11) and the neutralization tank (19).

2. The high-COD yellow water distillation waste liquid pretreatment device according to claim 1, characterized in that, The iron-carbon reaction device (5) is connected to a first reagent tank (6) and a second reagent tank (7) on one side. The first reagent tank (6) and the second reagent tank (7) add reagents to the iron-carbon reaction device (5) through a first diaphragm pump (8).

3. The high-COD yellow water distillation waste liquid pretreatment device according to claim 1, characterized in that, The alkaline hydrolysis reactor (11) is connected in sequence to a feeding device (13) and a third reagent tank (14) on one side. The feeding device (13) is a screw dosing pump.

4. The high-COD yellow water distillation waste liquid pretreatment device according to claim 3, characterized in that, The alkaline hydrolysis reactor (11) is equipped with a first detection device (12).

5. The high-COD yellow water distillation waste liquid pretreatment device according to claim 1, characterized in that, A second diaphragm pump (17) and a fourth reagent tank (18) are connected in sequence to one side of the neutralization tank (19), and a second detection device (16) is also provided inside the neutralization tank (19).

6. The high-COD yellow water distillation waste liquid pretreatment device according to claim 1, characterized in that, The sedimentation tank (3) is connected to a filter (1) and a first sewage pump (2) on the side away from the iron-carbon reaction device (5). The filter (1) is connected to a medium water tank (20) and a water storage tank (21) on the side away from the sedimentation tank (3).

7. The high-COD yellow water distillation waste liquid pretreatment device according to claim 1, characterized in that, A second sewage pump (9) is provided between the sedimentation tank (3) and the iron-carbon reaction device (5), a third sewage pump (10) is provided between the iron-carbon reaction device (5) and the alkaline hydrolysis reactor (11), and a fourth sewage pump (15) is provided between the alkaline hydrolysis reactor (11) and the neutralization tank (19).

8. A pretreatment device for high COD yellow water distillation waste liquid according to claim 6, characterized in that, It also includes a sludge tank (22) and a wastewater treatment plant (23), the bottom of the filter (1), sedimentation tank (3) and alkaline reactor (11) being connected to the sludge tank (22), and the neutralization tank (19) being connected to the wastewater treatment plant (23).

9. A pretreatment device for high COD yellow water distillation waste liquid according to claim 1, characterized in that, The sedimentation tank (3) and the iron-carbon reaction device (5) are made of corrosion-resistant materials.

10. A pretreatment device for high COD yellow water distillation waste liquid according to claim 1, characterized in that, The iron-carbon filler is a microporous iron-carbon alloy filler with a particle size of 3-5 cm and a porosity greater than 65%.

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