A method for preparing a biological denitrification carbon source for sewage treatment based on liquor factory testing waste liquid and cellar bottom water and a sewage treatment method

Abstract

This invention belongs to the field of water treatment, and particularly relates to a method for preparing a biological denitrification carbon source for wastewater treatment based on laboratory wastewater from a liquor distillery and pit water, as well as a wastewater treatment method. The method for preparing a biological denitrification carbon source for wastewater treatment provided by this invention includes the following steps: mixing laboratory wastewater from a liquor distillery with laboratory wastewater from a liquor distillery, followed by filtration, pH adjustment, and ozone oxidation treatment to obtain a biological denitrification carbon source for wastewater treatment. This invention utilizes laboratory wastewater from a liquor distillery and pit water as raw materials for preparing a biological denitrification carbon source. The high content of easily degradable alcohols and organic acids in the laboratory wastewater compensates for the low biodegradability and high content of recalcitrant organic matter in the pit water. Simultaneously, the high COD concentration and abundant organic components of the pit water can increase the total carbon source content of the mixed raw materials, achieving "complementary advantages." The method provided by this invention can realize the resource utilization of laboratory wastewater from a liquor distillery and pit water, reducing the cost of hazardous waste disposal and the cost of carbon sources for wastewater treatment.

Description

Technical Field

[0001] This invention belongs to the field of water treatment, and particularly relates to a method for preparing a biological denitrification carbon source for wastewater treatment based on laboratory waste liquid and cellar bottom water from a liquor factory, and a wastewater treatment method. Background Technology

[0002] In the field of wastewater treatment for Maotai-flavor liquor, biological denitrification processes (such as A / O and AAO processes) are the core technologies for removing total nitrogen (TN) from wastewater. The efficient operation of this process is highly dependent on a sufficient carbon source to maintain the metabolic activity of microorganisms. When the influent carbon-to-nitrogen ratio (C / N) is less than 3, the nitrate reduction efficiency of denitrifying bacteria is significantly reduced due to insufficient carbon source supply, and the denitrification efficiency is usually less than 60%.

[0003] Currently, the industry primarily uses commercially available carbon sources, with liquid sodium acetate (COD concentration 10,000~15,000 mg / L) and solid glucose (COD concentration approximately 20,000 mg / L after dissolution) being typical examples. Sodium acetate, in particular, is widely used due to its excellent biodegradability; for instance, a wastewater treatment plant in Maotai Town uses sodium acetate to adjust the C / N ratio of its influent to 4-5. However, the procurement cost of such commercial carbon sources is high, with a market price of 3,000-5,000 yuan / ton, accounting for approximately 30%-40% of the operating cost of wastewater treatment systems, thus placing significant economic pressure on enterprises. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a method for preparing a biological denitrification carbon source for wastewater treatment based on laboratory waste liquid and cellar bottom water from a liquor factory, and a wastewater treatment method. The method provided by this invention can realize the resource utilization of laboratory waste liquid and cellar bottom water from liquor factories, converting them into a highly efficient biological denitrification carbon source, replacing purchased commercial carbon sources, and reducing the cost of hazardous waste disposal and wastewater treatment carbon sources.

[0005] This invention provides a method for preparing a biological denitrification carbon source for wastewater treatment based on laboratory waste liquid and cellar bottom water from a liquor factory, comprising the following steps:

[0006] The water from the cellar bottom of the liquor factory is mixed with the laboratory waste liquid of the liquor factory, and then filtered, pH adjusted and ozone oxidized to obtain a biological denitrification carbon source for wastewater treatment.

[0007] Preferably, the volume ratio of the water at the bottom of the liquor cellar to the waste liquid from the liquor factory's laboratory is (0.5~2):1.

[0008] Preferably, the filter screen has a pore size of 0.5~2mm.

[0009] Preferably, the pH value of the water body after pH adjustment is 6 to 8.

[0010] Preferably, the pH adjustment is performed by diluting with water.

[0011] Preferably, the ozone concentration in the ozone oxidation treatment is 10~50 mg / L.

[0012] Preferably, the ozone oxidation treatment time is 10-60 minutes.

[0013] Preferably, the COD of the biological denitrification carbon source in the wastewater treatment is 90,000~250,000 mg / L, the BOD5 is 70,000~225,000 mg / L, and the pH value is 6~8.

[0014] This invention provides a wastewater treatment method, comprising the following steps:

[0015] Carbon sources are added during the biological denitrification treatment of wastewater.

[0016] The carbon source includes the wastewater treatment biological denitrification carbon source prepared by the method described in the above technical solution.

[0017] Preferably, the carbon-to-nitrogen mass ratio of the wastewater during the biological denitrification treatment is controlled at 3 to 5.

[0018] Compared with existing technologies, this invention provides a method for preparing a biological denitrification carbon source for wastewater treatment based on wastewater from a liquor distillery and water from its cellar bottom, as well as a wastewater treatment method. The method for preparing the biological denitrification carbon source for wastewater treatment provided by this invention includes the following steps: mixing wastewater from a liquor distillery's cellar bottom and wastewater from a liquor distillery, followed by filtration, pH adjustment, and ozone oxidation treatment to obtain the biological denitrification carbon source for wastewater treatment. This invention utilizes wastewater from a liquor distillery and water from its cellar bottom as raw materials for preparing the biological denitrification carbon source. The high content of easily degradable alcohols and organic acids in the wastewater compensates for the low biodegradability and high content of recalcitrant organic matter in the cellar bottom water. Simultaneously, the high COD concentration and abundant organic components of the cellar bottom water can increase the total carbon source content of the mixed raw materials, achieving a "complementary advantage." The method provided by this invention enables the resource utilization of wastewater from a liquor distillery and water from its cellar bottom, converting them into a highly efficient biological denitrification carbon source, replacing purchased commercial carbon sources, and reducing the cost of hazardous waste disposal and wastewater treatment carbon sources. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides a method for preparing a biological denitrification carbon source for wastewater treatment based on laboratory waste liquid and cellar bottom water from a liquor factory, comprising the following steps:

[0021] The water from the cellar bottom of the liquor factory is mixed with the laboratory waste liquid of the liquor factory, and then filtered, pH adjusted and ozone oxidized to obtain a biological denitrification carbon source for wastewater treatment.

[0022] In the biological denitrification carbon source preparation method provided by this invention, the water from the bottom of the distillery cellar originates from the leachate of the fermentation lees produced in the cellars used for brewing sauce-flavored baijiu; the COD of the water from the distillery cellar is preferably 150,000~250,000 mg / L, specifically 150,000 mg / L, 160,000 mg / L, 170,000 mg / L, 180,000 mg / L, 190,000 mg / L, 200,000 mg / L, 210,000 mg / L, 220,000 mg / L, 230,000 mg / L, 240,000 mg / L, or 250,000 mg / L; the NH3-N content of the water from the distillery cellar is preferably 300~800 mg / L, specifically 300 mg / L, 350 mg / L, 400 mg / L, 450 mg / L, 500 mg / L, or 550 mg / L. / L, 600mg / L, 650mg / L, 700mg / L, 750mg / L or 800mg / L; the TN content of the water at the bottom of the distillery's cellar is preferably 800~1800mg / L, specifically 800mg / L, 900mg / L, 1000mg / L, 1100mg / L, 1200mg / L, 1300mg / L, 1400mg / L, 1500mg / L. / L, 1600mg / L, 1700mg / L or 1800mg / L; the TP content of the bottom water of the liquor distillery is preferably 50~150mg / L, specifically 50mg / L, 60mg / L, 70mg / L, 80mg / L, 90mg / L, 100mg / L, 110mg / L, 120mg / L, 130mg / L, 140mg / L or 150mg / L.

[0023] In the biological denitrification carbon source preparation method provided by the present invention, the waste liquid from the liquor factory is derived from the alcohol and organic acid waste liquid generated by the daily testing of the liquor enterprise laboratory, and meets the requirement of "no heavy metal pollution" (the content of heavy metals such as lead and chromium is <0.1mg / L, which complies with the "Identification Standard for Toxic Substances in Hazardous Waste" GB5085.6-2007). In this invention, the COD of the waste liquid from the liquor distillery is preferably 200,000~300,000 mg / L, specifically 200,000 mg / L, 210,000 mg / L, 220,000 mg / L, 230,000 mg / L, 240,000 mg / L, 250,000 mg / L, 260,000 mg / L, 270,000 mg / L, 280,000 mg / L, 290,000 mg / L, or 300,000 mg / L; the NH3-N content of the waste liquid from the liquor distillery is preferably 5~20 mg / L, specifically 5 mg / L, 6 mg / L, 7 mg / L, 8 mg / L, 9 mg / L, etc. The TN content of the waste liquid from the liquor factory is preferably 10~30 mg / L, specifically 10 mg / L, 12 mg / L, 15 mg / L, 17 mg / L, 20 mg / L, 23 mg / L, 25 mg / L, 27 mg / L or 30 mg / L; the TP content of the waste liquid from the liquor factory is preferably 1~10 mg / L, specifically 1 mg / L, 2 mg / L, 3 mg / L, 4 mg / L, 5 mg / L, 6 mg / L, 7 mg / L, 8 mg / L, 9 mg / L or 10 mg / L.

[0024] In the biological denitrification carbon source preparation method provided by the present invention, the volume ratio of the bottom water of the liquor distillery to the laboratory waste liquid of the liquor distillery is preferably (0.5~2):1, more preferably (1~1.5):1, and specifically can be 1:1, 1.05:1, 1.1:1, 1.15:1, 1.2:1, 1.25:1, 1.3:1, 1.35:1, 1.4:1, 1.45:1 or 1.5:1.

[0025] In the biological denitrification carbon source preparation method provided by this invention, the filtration effectively removes suspended solids from the bottom water of the cellar, preventing blockage of the subsequent carbon source addition pipeline, and avoiding impurities affecting the activity of microorganisms. In this invention, the filter screen pore size is preferably 0.5~2mm, specifically 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm, with 1mm being the most preferred.

[0026] In the biological denitrification carbon source preparation method provided by this invention, the purpose of pH adjustment is to ensure that the pH value of the subsequently prepared carbon source is within a suitable pH range for microbial growth. In this invention, the preferred method of pH adjustment is dilution with water; the pH value of the water after pH adjustment is preferably 6-8, specifically 6, 6.5, 7, 7.5, or 8.

[0027] In the biological denitrification carbon source preparation method provided by the present invention, the COD of the water after dilution with water is preferably 80,000~150,000 mg / L, specifically 80,000 mg / L, 90,000 mg / L, 100,000 mg / L, 110,000 mg / L, 120,000 mg / L, 130,000 mg / L, 140,000 mg / L or 150,000 mg / L.

[0028] In the biological denitrification carbon source preparation method provided by this invention, ozone oxidation treatment can oxidize and remove impurities from the bottom water of the pit, degrading some recalcitrant organic matter into carbon dioxide, water, and small molecule inorganic matter, while retaining organic matter that is easily decomposed by microorganisms, thereby improving the biodegradability of the carbon source. In this invention, the ozone concentration in the ozone oxidation treatment is preferably 10-50 mg / L, specifically 10 mg / L, 15 mg / L, 20 mg / L, 25 mg / L, 30 mg / L, 35 mg / L, 40 mg / L, 45 mg / L, or 50 mg / L, with 30 mg / L being the most preferred. The ozone oxidation treatment time is preferably 10-60 min, specifically 10 min, 15 min, 20 min, 25 min, 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, or 60 min, with 30 min being the most preferred.

[0029] In the biological denitrification carbon source preparation method provided by this invention, the COD of the prepared wastewater treatment biological denitrification carbon source is preferably 90,000~250,000 mg / L, specifically 90,000 mg / L, 100,000 mg / L, 120,000 mg / L, 150,000 mg / L, 170,000 mg / L, 200,000 mg / L, 230,000 mg / L, or 250,000 mg / L; the BOD5 of the prepared wastewater treatment biological denitrification carbon source is preferably 700 mg / L. The concentration of NH3-N in the prepared biological nitrogen removal carbon source for wastewater treatment is preferably 100-200 mg / L, specifically 100 mg / L, 100000 mg / L, 120000 mg / L, 150000 mg / L, 170000 mg / L, 200000 mg / L, or 225000 mg / L; the concentration of NH3-N in the prepared biological nitrogen removal carbon source for wastewater treatment is preferably 100-200 mg / L, specifically 100 mg / L, 1 The concentrations of the prepared biological nitrogen removal carbon source for wastewater treatment are 10 mg / L, 120 mg / L, 130 mg / L, 140 mg / L, 150 mg / L, 160 mg / L, 170 mg / L, 180 mg / L, 190 mg / L, or 200 mg / L; the TN content is preferably 120~250 mg / L, specifically 120 mg / L, 130 mg / L, 140 mg / L, 150 mg / L, 160 mg / L, 170 mg / L, 180 mg / L. The concentrations of TP in the prepared biological nitrogen removal carbon source for wastewater treatment are preferably 10-50 mg / L, specifically 10 mg / L, 15 mg / L, 20 mg / L, 25 mg / L, 30 mg / L, 35 mg / L, 40 mg / L, 45 mg / L, or 50 mg / L; the pH value of the prepared biological nitrogen removal carbon source for wastewater treatment is preferably 6-8, specifically 6, 6.5, 7, 7.5, or 8.

[0030] The present invention also provides a wastewater treatment method, comprising the following steps:

[0031] Carbon sources are added during the biological denitrification treatment of wastewater.

[0032] The carbon source includes the wastewater treatment biological denitrification carbon source prepared by the method described in the above technical solution.

[0033] In the wastewater treatment method provided by this invention, the COD of the influent for the biological denitrification treatment is preferably 1000-1400 mg / L, more preferably 1100-1250 mg / L, and specifically can be 1137 mg / L, 1180 mg / L, 1200 mg / L, or 1210 mg / L; the TN content of the influent for the biological denitrification treatment is preferably 90-120 mg / L, more preferably 100-110 mg / L, and specifically can be 103 mg / L, 104 mg / L, 105 mg / L, or 1... The NH3-N content in the influent of the biological denitrification treatment is preferably 80~120 mg / L, more preferably 90~100 mg / L, specifically 91 mg / L, 93 mg / L, 95 mg / L or 97 mg / L; the TP content in the influent of the biological denitrification treatment is preferably 5~20 mg / L, more preferably 10~15 mg / L, specifically 12 mg / L, 13 mg / L or 14 mg / L; the pH value of the influent of the biological denitrification treatment is preferably 6~8, more preferably 7.

[0034] In the wastewater treatment method provided by the present invention, the carbon-to-nitrogen mass ratio (C / N ratio) of the wastewater during the biological denitrification treatment is preferably controlled at 3 to 5, specifically 3, 3.2, 3.5, 3.7, 4, 4.2, 4.5, 4.7 or 5.

[0035] In the wastewater treatment method provided by this invention, it is preferable to regularly sample and monitor the effluent, analyze the changes in various water quality indicators, and adjust process parameters such as carbon source dosage in a timely manner based on the monitoring results to ensure that the wastewater treatment effect is stable and meets the standards.

[0036] The method provided by this invention enables the resource utilization of laboratory waste liquid and cellar water in liquor factories, converting them into a highly efficient biological denitrification carbon source to replace purchased commercial carbon sources, thereby reducing the cost of hazardous waste disposal and wastewater treatment carbon sources.

[0037] The method provided by this invention includes the following key points:

[0038] (1) For the first time, it was proposed to mix the laboratory waste liquid of the liquor factory with the water at the bottom of the cellar. The high content of easily degradable alcohols and organic acid components in the laboratory waste liquid can make up for the defects of low biodegradability and high content of difficult-to-degrade organic matter in the water at the bottom of the cellar. At the same time, the high COD concentration and rich organic components of the water at the bottom of the cellar can increase the total carbon source of the mixed raw materials and achieve "complementary advantages".

[0039] (2) The process route of “mixing and compounding-pretreatment-ozone oxidation” is adopted to effectively ensure the stability of carbon source. By mixing and compounding the bottom water of the cellar with the laboratory waste liquid of the liquor factory, the concentration and composition of carbon source are adjusted to ensure that the prepared carbon source can be adapted to the microorganisms in the liquor wastewater treatment; by filtering, the microbial impurities in the bottom water are removed; by pH adjustment, the bottom water is adjusted to a suitable pH value; by ozone oxidation treatment, the difficult-to-decompose organic matter in the bottom water is oxidized and decomposed.

[0040] The method provided by this invention relates to the following technical theories:

[0041] (1) Carbon source compatibility theory: Laboratory wastewater and cellar bottom water contain abundant sugars, alcohols, and organic acids, including ethanol and propanol. These substances themselves have the potential to be used as denitrification carbon sources. They can be utilized by denitrifying bacteria without complex transformation and can be directly used as easily degradable carbon sources, significantly improving the biodegradability of the mixed raw materials. Moreover, the pollutant types of this mixed liquid are highly similar to those of the liquor wastewater (containing alcohols, esters, and organic acids) treated by the sewage treatment system. Denitrifying microorganisms do not need to adapt to new substrates, and their metabolic rate is 20-30% higher than that of commercial carbon sources (such as pure sodium acetate). In addition, multiple carbon sources (alcohols and organic acids) can form a "metabolic complementarity" effect. Under low temperature conditions, when the ethanol degradation rate decreases, acetic acid can still be utilized efficiently, thereby ensuring the stability of the denitrification process.

[0042] (2) Theory of Impurity Elimination: The raw materials of the bottom water come from various agricultural crops and do not contain heavy metals. Its impurities are mainly composed of distiller's grains residue, pit mud particles, and microbial cells. Although these substances are non-toxic, they can affect the stability of the carbon source solution. Through filtration, more than 95% of particulate impurities can be removed, avoiding an increase in the sludge settling ratio (SV30), ensuring the normal operation of the biochemical system, and preventing a decrease in system treatment efficiency due to impurity accumulation.

[0043] (3) C / N ratio precise control theory: Denitrification requires strict control of the C / N ratio (usually 3~5). When C / N < 3, nitrates cannot be completely reduced, which will lead to excessive TN in the effluent; when C / N > 5, excessive carbon source will cause excessive COD in the effluent. This invention adjusts the carbon source concentration through a compounding process and combines it with a dynamic dosing method to ensure that the C / N ratio is stable within the preferred range (3-5), thereby maximizing the denitrification efficiency and avoiding excessive effluent water quality indicators.

[0044] The method provided by this invention has the following advantages:

[0045] (1) Reduced hazardous waste disposal costs: Laboratory waste liquid no longer needs to be entrusted to a third party for disposal. Based on the market disposal fee of RMB 7,500 per ton, the cost can be reduced by RMB 7,500 per ton disposed of.

[0046] (2) Reduced carbon source cost: The main costs of carbon source preparation in this invention are power consumption (calculated with a 5kg air source ozone generator, the power consumption is about 80kw / h.kg·O3) and water consumption (4 yuan / ton). The cost of preparing one ton of carbon source is about 90 yuan. The market price of common liquid carbon source is 2000 yuan / ton. For every ton of liquid carbon source saved, the cost can be reduced by 1910 yuan.

[0047] (3) Excellent environmental performance: It realizes the resource utilization of laboratory waste liquid and cellar water in the liquor factory, reduces the amount of hazardous waste and wastewater disposal, and has no secondary pollution.

[0048] For clarity, the following examples and comparative examples provide a detailed description. In the following examples and comparative examples of the present invention, all examples and comparative examples are based on the same biochemical system (five-stage Bardenpho process) of a Maotai-flavor liquor wastewater treatment plant. Variables were strictly controlled during the experimental process, and only the target parameters were adjusted.

[0049] Example 1

[0050] (1) Provide the waste liquid and cellar water of the liquor factory for testing. The water quality indicators of the waste liquid of the liquor factory are: COD=240000mg / L, NH3-N=10mg / L, TN=15mg / L, TP=6mg / L. The water quality indicators of the cellar water of the liquor factory are: COD=180000mg / L, NH3-N=600mg / L, TN=1300mg / L, TP=110mg / L.

[0051] (2) Mix the waste liquid from the liquor factory with the water at the bottom of the cellar at a volume ratio of 1:1, filter (filter mesh size 1mm), add water to dilute to pH value of about 7, and obtain a mixed waste liquid with COD of 120000mg / L.

[0052] (3) The above mixed waste liquid was subjected to ozone oxidation treatment with an ozone concentration of 30 mg / L and a treatment time of 30 min to obtain a biological denitrification carbon source for wastewater treatment (COD=100000 mg / L, BOD5=95000 mg / L, NH3-N=130 mg / L, TN=160 mg / L, TP=30 mg / L, pH≈7).

[0053] (4) The above carbon source was used in the five-stage Bardenpho process. The influent flow rate was 20 mL / min, the sludge return flow rate was 70 mL / min, the nitrification liquor return flow rate was 100 mL / min, the dissolved oxygen in the aerobic stage was 4 mg / L, and the carbon source dosage was adjusted according to a C / N ratio of 4. The experimental results are shown in Table 1.

[0054] Table 1. Test Results of Example 1

[0055]

[0056] (5) Results analysis: The ethanol and acetic acid present in the compound carbon source form a "metabolic complement". The denitrification rate reaches 85.44% at room temperature, and the TN index of the effluent meets the industry emission standard limit. Through ozone oxidation treatment, the removal rate of recalcitrant organic matter in the waste liquid reaches 82%, and the BOD5 / COD increases to 0.68, laying a good foundation for subsequent biochemical reactions.

[0057] Comparative Example 1

[0058] Compared to Example 1, this comparative example only uses wastewater from a liquor distillery to prepare a biological nitrogen removal carbon source for wastewater treatment. The specific details are as follows:

[0059] (1) Provide the waste liquid from the liquor factory for testing. The water quality indicators are the same as in Example 1.

[0060] (2) The waste liquid from the liquor factory was filtered (filter mesh size 1mm), and diluted with water to a pH value of about 7 to obtain a waste liquid with a COD of 60000mg / L.

[0061] (3) The above waste liquid was subjected to ozone oxidation treatment under the same conditions as in Example 1 to obtain a biological denitrification carbon source for wastewater treatment (COD=52000mg / L, BOD5=28600mg / L, NH3-N=12mg / L, TN=18mg / L, TP=7mg / L, pH≈7).

[0062] (4) The above carbon source was used in a five-stage bardenpho process, with the same process parameters as in Example 1. The experimental results are shown in Table 2:

[0063] Table 2 Results of Comparative Example 1

[0064]

[0065] (5) Results analysis: Using the organic waste liquid from the laboratory as a carbon source alone, the biodegradability of the waste liquid is limited. Even after ozone treatment, the BOD5 / COD only increased to 0.55, and the denitrification rate was 18.46% lower than that in Example 1. This proves that mixing the laboratory waste liquid from the liquor factory with the water at the bottom of the cellar is the key to ensuring the feasibility of the process.

[0066] Comparative Example 2

[0067] Compared with Example 1, this comparative example uses a commercial carbon source (sodium acetate), as detailed below:

[0068] (1) Carbon source type: commercially available liquid sodium acetate (COD concentration 15000mg / L, purity ≥98%).

[0069] (2) The above carbon source was used in a five-stage bardenpho process, with the same process parameters as in Example 1. The experimental results are shown in Table 3:

[0070] Table 3 Results of Comparative Example 2

[0071]

[0072] (5) Results analysis: The denitrification rate of commercial sodium acetate was 79.05%, which was lower than 85.44% in Example 1 of the present invention; and the cost of sodium acetate carbon source was as high as RMB 2,000 / ton, which was about 22 times the carbon source preparation cost of the present invention (RMB 90 / ton). Long-term use will greatly increase the operating cost of sewage treatment plants.

[0073] Comparative Example 3

[0074] Compared with Example 1, this comparative example only uses water from the bottom of a liquor distillery to prepare a biological denitrification carbon source for wastewater treatment. The specific details are as follows:

[0075] (1) Provide water from the cellar bottom of the liquor factory, with water quality indicators the same as in Example 1.

[0076] (2) The water at the bottom of the cellar of the liquor factory was filtered (the filter screen has a pore size of 1 mm), and diluted with clean water to a pH value of about 7, resulting in a waste liquid with a COD of 90000 mg / L.

[0077] (3) The above waste liquid was subjected to ozone oxidation treatment with an ozone concentration of 30 mg / L and a treatment time of 30 min to obtain a biological denitrification carbon source for wastewater treatment (COD=78000 mg / L, BOD5=45240 mg / L, NH3-N=620 mg / L, TN=1350 mg / L, TP=118 mg / L, pH≈7).

[0078] (4) The above carbon source was used in a five-stage bardenpho process, with the same process parameters as in Example 1. The experimental results are shown in Table 4:

[0079] Table 4 Results of Comparative Example 3

[0080]

[0081] (5) Results analysis: When the bottom water of the cellar was used alone, although it was treated with ozone, the removal rate of refractory organic matter was only 75% (lower than 82% in Example 1). After ozone oxidation treatment, the BOD5 / COD of the waste liquid remained at 0.58, resulting in a denitrification rate (73.08%) that was 12.36% lower than that in Example 1. Moreover, the bottom water of the cellar was used alone as a carbon source, with a single composition (mainly sugars and alcohols), poor adaptability to microbial metabolism, and a COD removal rate of effluent that was 9.14% lower. This further proves the advantages of the synergistic combination of "laboratory waste liquid + bottom water of the cellar".

[0082] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a biological nitrogen removal carbon source for wastewater treatment based on laboratory waste liquid and cellar bottom water from a liquor distillery, characterized in that, Includes the following steps: The water from the cellar bottom of the liquor factory is mixed with the laboratory waste liquid of the liquor factory, and then filtered, pH adjusted and ozone oxidized to obtain a biological denitrification carbon source for wastewater treatment.

2. The method according to claim 1, characterized in that, The volume ratio of the water at the bottom of the liquor cellar to the waste liquid from the liquor factory's laboratory is (0.5~2):

1.

3. The method according to claim 1, characterized in that, The filter screen has a pore size of 0.5~2mm.

4. The method according to claim 1, characterized in that, The pH value of the water body after pH adjustment is 6~8.

5. The method according to claim 1, characterized in that, The pH adjustment method is to dilute with water.

6. The method according to claim 1, characterized in that, The ozone concentration in the ozone oxidation treatment is 10~50 mg / L.

7. The method according to claim 1, characterized in that, The ozone oxidation treatment time is 10~60 min.

8. The method according to claim 1, characterized in that, The COD of the biological denitrification carbon source for wastewater treatment is 90,000~250,000 mg / L, the BOD5 is 70,000~225,000 mg / L, and the pH value is 6~8.

9. A wastewater treatment method, characterized in that, Includes the following steps: Carbon sources are added during the biological denitrification treatment of wastewater. The carbon source includes the wastewater treatment biological denitrification carbon source prepared by the method according to any one of claims 1 to 8.

10. The wastewater treatment method according to claim 9, characterized in that, The carbon-to-nitrogen mass ratio of the wastewater during the biological denitrification treatment is controlled at 3-5.

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