Evaluation Method for Organic Wastewater as a Carbon Source for Sewage Treatment

Abstract

This application belongs to the technical field of sewage treatment, and provides an evaluation method for using organic wastewater as a carbon source for sewage treatment, including: separately testing the denitrification rate of the organic wastewater sample for the sewage source in the anoxic tank, as well as the nitrification reaction inhibition rate and COD removal rate for the sewage source in the aerobic tank, and then testing the denitrification rate of the carbon source sample for the sewage source in the anoxic tank, as well as the COD removal rate for the sewage source in the aerobic tank, so as to judge whether the organic wastewater meets the requirements for using the carbon source according to the test results of the organic wastewater sample and the carbon source sample. The evaluation method of this application has the characteristics of being simple, fast, and accurate, etc.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and particularly to an evaluation method for using organic wastewater as a carbon source in sewage treatment. Background Art

[0002] Organic wastewater is characterized by high discharge volume, high chemical oxygen demand (COD Cr ), and high biochemical oxygen demand (BOD5). For example, the liquor wastewater discharged by liquor enterprises has good biodegradability and does not contain toxic and harmful substances. Due to the high chemical oxygen demand of organic wastewater, the treatment cost is high.

[0003] Due to the low C / N and B / N ratios of urban domestic sewage, in the process of sewage treatment, in order to improve the nitrogen and phosphorus removal efficiency, it is necessary to supplement additional carbon sources to achieve the up-to-standard discharge of the effluent. In traditional technologies, glucose and starch are used as carbon sources. If the high chemical oxygen demand and biodegradability of organic wastewater can be utilized to replace the carbon source, it can not only reduce the treatment cost of organic wastewater, but also reduce the pressure on the carbon source demand of sewage treatment plants, and promote the resource utilization of industrial wastewater. However, compared with traditional carbon sources, the composition of organic wastewater is complex. Directly introducing it into sewage treatment plants to replace carbon sources may affect the sewage treatment effect and even fail to meet the requirements for the use of carbon sources. Therefore, how to evaluate and judge whether organic wastewater can replace carbon sources has become an urgent technical problem to be solved at present. Summary of the Invention

[0004] Based on this, an embodiment of the present application provides an evaluation method for using organic wastewater as a carbon source in sewage treatment, which is simple and accurate.

[0005] The present application provides an evaluation method for using organic wastewater as a carbon source in sewage treatment, and the evaluation method includes:

[0006] Mixing a sewage sample and an anoxic tank sludge sample to obtain an anoxic tank sewage source;

[0007] Introducing a carbon source sample into the anoxic tank sewage source and testing to obtain a first denitrification rate;

[0008] Introducing an organic wastewater sample into the anoxic tank sewage source and testing to obtain a second denitrification rate;

[0009] Mixing a sewage sample and an aerobic tank sludge sample to obtain an aerobic tank sewage source;

[0010] Introducing the carbon source sample into the aerobic tank sewage source and testing to obtain a first COD removal rate;

[0011] Introducing the organic wastewater sample into the aerobic tank sewage source and testing to obtain a nitrification reaction inhibition rate and a second COD removal rate;

[0012] The test results meet the following requirements: the ratio of the second denitrification rate to the first denitrification rate ≥ 0.9; the nitrification inhibition rate ≤ 10%; the ratio of the second COD removal rate to the first COD removal rate ≥ 0.9, and the organic wastewater meets the carbon source requirements.

[0013] In some embodiments, the test method for the nitrification inhibition rate includes:

[0014] Introduce demineralized water into the aerobic tank sewage source, and test the change amount of blank total Kjeldahl nitrogen. The total volume of the aerobic tank sewage source into which the demineralized water is introduced is equal to the total volume of the aerobic tank sewage source into which the organic wastewater sample is introduced;

[0015] During the test of introducing the organic wastewater sample into the aerobic tank sewage source, test the first change amount of total Kjeldahl nitrogen. The nitrification inhibition rate is the ratio of the first change amount of total Kjeldahl nitrogen to the change amount of blank total Kjeldahl nitrogen.

[0016] In some embodiments, the evaluation method further includes:

[0017] Introduce the organic wastewater sample into the aerobic tank sewage source, and test the first phosphorus uptake rate;

[0018] Introduce demineralized water into the aerobic tank sewage source, and test the second phosphorus uptake rate. The total volume of the aerobic tank sewage source into which the demineralized water is introduced is equal to the total volume of the aerobic tank sewage source into which the organic wastewater sample is introduced;

[0019] The test results also meet the requirement that the ratio of the first phosphorus uptake rate to the second phosphorus uptake rate ≥ 0.9.

[0020] In some embodiments, the chemical oxygen demand (COD) of the organic wastewater sample cr is 20000 mg / L - 30000 mg / L, and the biochemical oxygen demand (BOD5) is 10000 mg / L - 20000 mg / L.

[0021] In some embodiments, the initial total nitrogen value of the sewage sample is 30 mg / L - 50 mg / L.

[0022] In some embodiments, the initial total phosphorus value of the sewage sample is 2 mg / L - 4 mg / L.

[0023] In some embodiments, the initial chemical oxygen demand (COD) of the sewage sample cr is 150 mg / L - 300 mg / L.

[0024] In some embodiments, the carbon source sample includes at least one of glucose, lactic acid, acetic acid, ethylene glycol, isopropanol, ethyl alkylphenol, and lignin.

[0025] In some embodiments, the organic wastewater sample includes alcoholic organic wastewater.

[0026] In some embodiments, in terms of chemical oxygen demand equivalent, the inflow rate of the organic wastewater sample into the anoxic tank sewage source is 0.5 to 2 times the inflow rate of the sewage sample.

[0027] In some embodiments, in terms of chemical oxygen demand equivalent, the inflow rate of the organic wastewater sample into the aerobic tank sewage source is 0.5 to 2 times the inflow rate of the sewage sample.

[0028] In some embodiments, in terms of chemical oxygen demand equivalent, the inflow rate of the carbon source sample into the anoxic tank sewage source is equal to the inflow rate of the organic wastewater sample into the anoxic tank sewage source.

[0029] Compared with the traditional technology, the present application has at least the following beneficial effects:

[0030] The present application tests the denitrification rate, nitrification reaction inhibition rate, and COD removal rate of organic wastewater, and compares the test results with those of conventional carbon sources to determine whether the organic wastewater can be used as a substitute for the carbon source in sewage treatment, avoiding the uncertainty of using organic wastewater as a carbon source. In addition, there is no need to build a complete test equipment, and the feasibility of using organic wastewater as a carbon source can be evaluated only by detecting and evaluating parameters, effectively reducing the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a graph showing the change in total nitrogen content of each test object in the denitrification test of the embodiment of the present application.

[0032] Figure 2 It is a graph comparing the denitrification rates of each test object in the denitrification test of the embodiment of the present application.

[0033] Figure 3 It is a graph comparing the nitrification reaction inhibition rates of each test object in the nitrification reaction inhibition rate test of the embodiment of the present application.

[0034] Figure 4 It is a graph showing the change in total phosphorus content of each test object in the nitrification reaction inhibition rate test of the embodiment of the present application.

[0035] Figure 5 It is a graph showing the change in COD content of each test object in the COD removal rate test of the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following will further elaborate on the present application in conjunction with the embodiments and examples. These embodiments and examples are only used to illustrate the present application and not to limit the scope of the present application. The purpose of providing these embodiments and examples is to make the understanding of the disclosed content of the present application more thorough and comprehensive. It should also be understood that the present application can be implemented in many different forms and is not limited to the embodiments and examples described herein. Those skilled in the art can make various changes or modifications without departing from the connotation of the present application, and the equivalent forms obtained also fall within the protection scope of the present application. In addition, in the following description, a large number of specific details are given to provide a more thorough understanding of the present application. It should be understood that the present application can be implemented without one or more of these details.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0038] In this application, "optionally", "optional", "option" mean having or not having, that is, any one of the two parallel options of "having" or "not having". If "optional" appears in a technical solution in multiple places, without special instructions and without contradictions or mutual restrictions, each "optional" is independent of each other.

[0039] In this application, in "the first aspect", "the second aspect", etc., the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", etc. only serve the purpose of non-exhaustive listing and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0040] In this application, for the technical features described in an open-ended manner, it includes a closed technical solution composed of the listed features, as well as an open technical solution including the listed features.

[0041] In this application, when it comes to numerical intervals (i.e., numerical ranges), unless otherwise specified, the distribution of the selectable numerical values within the numerical interval is considered continuous, and includes the two numerical endpoints of the numerical interval (i.e., the minimum value and the maximum value), as well as each numerical value between these two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers within the numerical interval, it includes the two endpoint integers of the numerical range, as well as each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all sub-ranges subsumed therein. The "numerical values" in the numerical interval can be any quantitative values, such as numbers, percentages, ratios, etc. The "numerical interval" allows for a broad inclusion of quantitative intervals such as percentage intervals, ratio intervals, and ratio value intervals.

[0042] All documents mentioned in this application are cited as references in this application, as if each document is cited separately as a reference. Unless it conflicts with the application purpose and / or technical solution of this application, the cited documents involved in this application are cited for all their contents and all their purposes. When this application involves cited documents, the definitions of relevant technical features, terms, nouns, phrases, etc. in the cited documents are also cited. When this application involves cited documents, the examples and preferred methods of the relevant technical features cited can also be incorporated as references into this application, but only to the extent that this application can be implemented. It should be understood that when the cited content conflicts with the description in this application, this application shall prevail or be adaptively corrected according to the description in this application.

[0043] In traditional technologies, for replacing the carbon source in a sewage treatment plant with a certain organic wastewater, multiple adjustments and attempts are required to ensure the treatment effect of sewage treatment. It is also possible to find during multiple experiments that the organic wastewater does not meet the requirements as a carbon source. The entire process not only takes a long time but also incurs high costs.

[0044] This application provides an evaluation method for using organic wastewater as a carbon source for sewage treatment. The evaluation method includes:

[0045] Mixing a sewage sample and an anoxic tank sludge sample to obtain an anoxic tank sewage source;

[0046] Introducing a carbon source sample into the anoxic tank sewage source and testing to obtain a first denitrification rate;

[0047] Introducing an organic wastewater sample into the anoxic tank sewage source and testing to obtain a second denitrification rate;

[0048] Mixing a sewage sample and an aerobic tank sludge sample to obtain an aerobic tank sewage source;

[0049] Feed the carbon source sample into the aerobic tank sewage source, and test to obtain the first COD removal rate;

[0050] Feed the organic wastewater sample into the aerobic tank sewage source, and test to obtain the nitrification reaction inhibition rate and the second COD removal rate.

[0051] The test results meet the following requirements: the ratio of the second denitrification rate to the first denitrification rate ≥ 0.9; the ratio of the nitrification reaction inhibition rate ≤ 10%; the ratio of the second COD removal rate to the first COD removal rate ≥ 0.9, and the organic wastewater meets the carbon source requirements.

[0052] This application tests the denitrification rate, nitrification reaction inhibition rate and COD removal rate of organic wastewater, compares with the test results of conventional carbon sources, and judges whether the organic wastewater can be used as a substitute for the carbon source in sewage treatment, avoiding the uncertainty of using organic wastewater as a carbon source. In addition, there is no need to build a complete test equipment, and the feasibility of using organic wastewater as a carbon source can be evaluated only by detecting and evaluating parameters, effectively reducing the test cost.

[0053] It can be understood that in this application, controlling the denitrification rate, nitrification reaction inhibition rate and COD removal rate of organic wastewater is close to the test results of using existing carbon sources for sewage treatment, so as to judge that the organic wastewater can replace the existing carbon source. Optionally, the ratio of the second denitrification rate to the first denitrification rate is 0.9 - 1.1. For example, the ratio of the second denitrification rate to the first denitrification rate is 0.90, 0.95, 1.00, 1.05 or 1.1. Optionally, the nitrification reaction inhibition rate is 0 - 10%. The ratio of the second nitrification reaction inhibition rate to the first nitrification reaction inhibition rate is 0, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 20%. The ratio of the second COD removal rate to the first COD removal rate is 0.90, 0.95, 1.00, 1.05 or 1.1.

[0054] It can be understood that in this application, there are no specific requirements and special limitations on the content of the aerobic tank sewage source and the anoxic tank sewage source, and appropriate sewage samples, aerobic tank sludge samples and anoxic tank sludge samples can be selected according to different sewage treatment requirements. During the test, the aerobic tank sewage source and the anoxic tank sewage source selected for the organic wastewater sample and the carbon source sample should be the same. For example, parameters such as pH and dissolved oxygen should be the same.

[0055] In some embodiments, the test method for the nitrification reaction inhibition rate includes:

[0056] Feed the demineralized water into the aerobic tank sewage source, and test to obtain the change amount of total Kjeldahl nitrogen in the blank. The total volume of the aerobic tank sewage source into which the demineralized water is fed is equal to the total volume of the aerobic tank sewage source into which the organic wastewater sample is fed;

[0057] During the test of feeding the organic wastewater sample into the aerobic tank sewage source, test to obtain the first change amount of total Kjeldahl nitrogen. The nitrification reaction inhibition rate is the ratio of the first change amount of total Kjeldahl nitrogen to the change amount of total Kjeldahl nitrogen in the blank.

[0058] It can be understood that the change amount of total Kjeldahl nitrogen refers to the difference between the total Kjeldahl nitrogen value in the initial state of the test and the total Kjeldahl nitrogen value after the test ends.

[0059] In some embodiments, the evaluation method further includes:

[0060] Feed the organic wastewater sample into the aerobic tank sewage source, and test to obtain the first phosphorus uptake rate;

[0061] Feed the demineralized water into the aerobic tank sewage source, and test to obtain the second phosphorus uptake rate. The total volume of the aerobic tank sewage source into which the demineralized water is fed is equal to the total volume of the aerobic tank sewage source into which the organic wastewater sample is fed;

[0062] The test results also satisfy that the ratio of the first phosphorus uptake rate to the second phosphorus uptake rate ≥ 0.9, for example, it can be 0.90, 0.95, 1.00, 1.05 or 1.10.

[0063] The present application further tests the phosphorus uptake rate of the organic wastewater sample added to the aerobic tank sewage source, so as to effectively ensure the sewage treatment effect when the organic wastewater sample is used as a carbon source.

[0064] In some embodiments, the chemical oxygen demand COD of the organic wastewater sample cr is 20000 mg / L to 30000 mg / L, for example, it can be 20000 mg / L, 21000 mg / L, 22000 mg / L, 23000 mg / L, 24000 mg / L, 25000 mg / L, 26000 mg / L, 27000 mg / L, 28000 mg / L, 29000 mg / L or 30000 mg / L.

[0065] In some embodiments, the biochemical oxygen demand BOD5 of the organic wastewater sample is 10,000 mg / L to 20,000 mg / L, and for example, it can be 10,000 mg / L, 11,000 mg / L, 12,000 mg / L, 13,000 mg / L, 14,000 mg / L, 15,000 mg / L, 16,000 mg / L, 17,000 mg / L, 18,000 mg / L, 19,000 mg / L or 20,000 mg / L.

[0066] The present application selects the chemical oxygen demand COD of the organic wastewater sample as above cr and the biochemical oxygen demand BOD5, so that the organic wastewater meets the requirements of high chemical oxygen demand and good biodegradability, thereby effectively ensuring that the organic wastewater can replace the carbon source in sewage treatment.

[0067] In some embodiments, the initial total nitrogen value of the sewage sample is 30 mg / L to 50 mg / L.

[0068] In some embodiments, the initial total phosphorus value of the sewage sample is 2 mg / L to 4 mg / L.

[0069] In some embodiments, the initial chemical oxygen demand COD of the sewage sample cr is 150 mg / L to 300 mg / L.

[0070] The present application selects the initial total nitrogen value, the initial total phosphorus value and the initial chemical oxygen demand COD of the sewage sample as above cr and has a good sewage treatment effect for the replacement of the carbon source by the organic wastewater.

[0071] It should be noted that the carbon source sample in the present application can be a conventional single carbon source or a mixture of multiple carbon sources. In some embodiments, the carbon source sample includes at least one of glucose, lactic acid, acetic acid, ethylene glycol, isopropanol, ethyl alkylphenol and lignin.

[0072] In some embodiments, the organic wastewater sample includes alcoholic organic wastewater.

[0073] In some embodiments, in terms of the chemical oxygen demand as an equivalent, the input amount of the organic wastewater sample into the anoxic tank sewage source is 0.5 times to 2 times the input amount of the sewage sample.

[0074] In some embodiments, in terms of the chemical oxygen demand as an equivalent, the input amount of the organic wastewater sample into the aerobic tank sewage source is 0.5 times to 2 times the input amount of the sewage sample.

[0075] In some embodiments, in terms of chemical oxygen demand as the equivalent, the input amount of the carbon source sample into the anoxic tank sewage source is equal to the input amount of the organic wastewater sample into the anoxic tank sewage source.

[0076] The implementation schemes of the present application will be described in detail below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. For the experimental methods without specific conditions in the following embodiments, the guidance given in the present application is preferentially referred to, and it can also be carried out according to the experimental manuals or conventional conditions in the art, or according to the conditions recommended by the manufacturer, or referring to the experimental methods known in the art.

[0077] In the following embodiments, the sewage sample is selected from the influent of a certain sewage treatment plant, the organic wastewater sample is selected from brewing wastewater, and the carbon source is a composite carbon source. The water quality information is as follows:

[0078]

[0079] Example 1

[0080] (1) Test of denitrification rate

[0081] Take the activated sludge in the anoxic tank as the anoxic tank sludge sample, and introduce the sewage sample and the carbon source for denitrification treatment. Among them, the added volume of the anoxic tank sludge sample is 400 mL, and the total experimental volume after adding the sewage sample and the carbon source is 800 mL;

[0082] Test the denitrification rate under the following carbon source addition conditions respectively:

[0083] (1) In terms of chemical oxygen demand COD cr calculated, the dosing ratio of the composite carbon source is 1 times the equivalent of the influent COD, and the composite carbon source is diluted 2475 times before use, numbered as control group 1.

[0084] (2) Add brewing wastewater with COD cr of 26250 mg / L as the carbon source. To ensure that the dosing ratio of the brewing wastewater is 1 times the equivalent of the influent COD, the brewing wastewater is diluted 117 times before use, numbered as test group 3. Similarly, after diluting the brewing wastewater, it is dosed according to 0.5 times, 1.5 times and 2 times of the influent COD of the sewage sample respectively, and numbered as test group 2, test group 4 and test group 5 respectively.

[0085] The denitrification test results are shown in Table 1. Among them, the content of total nitrogen (NO2 - -N + NO3 - -N) in control group 1, test group 2, test group 3, test group 4 and test group 5 with the reaction time is as Figure 1As shown, the comparison chart of denitrification rates for Control Group 1, Test Group 2, Test Group 3, Test Group 4, and Test Group 5 is as Figure 2 shown.

[0086] Table 1

[0087]

[0088] Among them, the denitrification rate = (total nitrogen concentration before reaction - total nitrogen concentration after reaction) / time. Taking Control Group 1 as an example, the denitrification rate = (40.25 mg / L - 25.62 mg / L) / 3 h = 4.88 mg / (L·h).

[0089] As can be seen from the above table, when the dosage of brewing wastewater is 1 times the influent COD Cr , its denitrification rate is equivalent to that of Control Group 1 with the addition of composite carbon source. This indicates that the brewing wastewater can replace the composite carbon source as a more economical and effective carbon source. And when the carbon source dosage is 1 - 2 times the influent COD Cr , that is, when the brewing wastewater is diluted 117 times - 58 times, the denitrification rate increases with the increase of the influent COD Cr concentration, and the denitrification rate of the brewing wastewater meets the carbon source requirements.

[0090] (2) Nitrification inhibition rate and phosphorus uptake rate of brewing wastewater as an alternative carbon source

[0091] Select the sludge in the aerobic tank as the aerobic tank sludge sample. Pass the sewage sample into the aerobic tank sludge sample, and at the same time pass the organic wastewater sample for nitrification treatment. After nitrification treatment, test the total Kjeldahl nitrogen value and total phosphorus value of the sewage sample. Among them, the addition amount of the aerobic tank sludge sample is 1000 mL, and the total experimental volume is 2000 mL after adding the sewage sample and the organic wastewater sample;

[0092] Specifically, first set up a desalted water addition group for comparison, numbered Control Group 1, and then set the dilution multiples of the added brewing wastewater to be 50 times, 100 times, 200 times, and 500 times, numbered Test Group 2, Test Group 3, Test Group 4, and Test Group 5 respectively, to investigate the influence of brewing wastewater replacing carbon source on the nitrification process at different dilution multiples. The test results are shown in Table 2.

[0093] Table 2

[0094]

[0095] Among them, in control group 1, the initial TKN is denoted as A1, and the final TKN is denoted as A2. The initial TKN of the experimental group is denoted as B1, and the final TKN is denoted as B2. Then the nitrification inhibition rate = (B1 - B2) / (A1 - A2). The phosphorus uptake rate = (total phosphorus value before reaction - total phosphorus value after reaction) / time. Taking experimental group 2 as an example, the phosphorus uptake rate = (4.55 mg / L - 3.25 mg / L) / 2 h = 0.65 mg / (L·h).

[0096] As can be seen from the above table, in the nitrification inhibition test, the initial theoretical value of TKN in each system is 40 mg / L, and the actually measured initial TKN values are 39.4 mg / L, 32.8 mg / L, 36 mg / L, 36 mg / L, and 37 mg / L respectively. After a 24-hour reaction cycle, the final TKN values in each reaction system, as well as the inhibition rate of the nitrification reaction in the system by adding organic wastewater as a carbon source, are as Figure 3 shown. Therefore, when the organic wastewater is diluted 100 times, its inhibitory effect is significantly reduced compared with when it is diluted 50 times, indicating that using organic wastewater diluted 100 times or more as an alternative carbon source will not inhibit the nitrification reaction in the sewage treatment process.

[0097] Furthermore, during the nitrification inhibition test, the change in the TP concentration in the reaction system was measured, as Figure 4 shown, and the results showed that the phosphorus uptake rate increased with the increase in the dilution factor.

[0098] (3) COD removal rate test

[0099] Select the sludge in the aerobic tank as the sludge sample, introduce the sewage sample into the aerobic tank sludge sample, and at the same time introduce the organic wastewater sample. After oxidation treatment, the chemical oxygen demand COD of the treated sewage sample is measured cr , among which, the addition amount of the aerobic tank sludge sample is 1000 mL, and the total experimental volume is 2000 mL after adding the sewage sample and the carbon source.

[0100] One blank group, two groups of tests with the addition of composite carbon source, and three groups of tests (dilution of brewing wastewater 1 by about 118 times) and four groups of tests (dilution of brewing wastewater 2 by about 59 times) with organic wastewater as the carbon source are set respectively. The test results are shown in Table 3.

[0101] Table 3

[0102]

[0103] From the above table, combined with Figure 5 it can be seen that after using brewing wastewater to replace the carbon source addition, the biodegradability of brewing wastewater is not lower than that of the composite carbon source, and its COD CrThe removal rate is not lower than that of the composite carbon source. When the dosage of the carbon source is 1 to 2 times the influent COD Cr , that is, when the organic wastewater is diluted 117 to 58 times, the denitrification rate increases with the increase of the influent COD Cr concentration. According to the research results on the inhibitory effects of different dilution multiples of organic wastewater on the nitrification rate and phosphorus removal rate, when the organic wastewater is diluted 100 times or more, using wine wastewater as a supplementary carbon source for the sewage treatment plant will not have an obvious inhibitory effect on the nitrification reaction and phosphorus removal efficiency. Based on the above comprehensive test results, it is recommended that the dosage of the organic wastewater be 1 equivalent of the influent COD Cr . In addition, under this dilution concentration condition, the organic wastewater has no obvious effect on the COD Cr removal rate and the oxygen consumption rate of the activated sludge. Moreover, according to the tests in the sewage treatment plant, the wine-making wastewater evaluated in this application can replace the carbon source for sewage treatment.

[0104] Therefore, the organic wastewater in this application meets the limit requirements of the denitrification rate, nitrification reaction inhibition rate, phosphorus uptake rate, and COD removal rate, indicating that the organic wastewater can be used as a carbon source. In addition, under the condition of not less than the current dosage of COD Cr equivalent, the organic wastewater can achieve a denitrification effect similar to and better than that of the traditional carbon source; and it will not affect the nitrification reaction, phosphorus uptake rate, and microbial oxygen consumption rate of the sewage treatment system.

[0105] In summary, this application tests the denitrification rate, nitrification reaction inhibition rate, and COD removal rate of the organic wastewater, compares the test results with those of the conventional carbon source, and judges whether the organic wastewater can replace the carbon source in sewage treatment, avoiding the uncertainty of using the organic wastewater as a carbon source. In addition, without building a complete test equipment, it is only necessary to conduct parameter detection and evaluation to evaluate the feasibility of using the organic wastewater as a carbon source, effectively reducing the test cost.

[0106] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope recorded in this specification.

[0107] The above-described embodiments merely represent several implementation manners of this application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. An evaluation method for using organic wastewater as a carbon source for sewage treatment, characterized in that, The evaluation method includes: Mixing a sewage sample and an anoxic tank sludge sample to obtain an anoxic tank sewage source; Introducing a carbon source sample into the anoxic tank sewage source and testing to obtain a first denitrification rate; Introducing an organic wastewater sample into the anoxic tank sewage source and testing to obtain a second denitrification rate; Mixing a sewage sample and an aerobic tank sludge sample to obtain an aerobic tank sewage source; Introducing the carbon source sample into the aerobic tank sewage source and testing to obtain a first COD removal rate; Introducing the organic wastewater sample into the aerobic tank sewage source and testing to obtain a nitrification inhibition rate and a second COD removal rate; The testing method for the nitrification inhibition rate includes: Introducing demineralized water into the aerobic tank sewage source and testing to obtain a blank total Kjeldahl nitrogen change amount. The total volume of the aerobic tank sewage source into which the demineralized water is introduced is equal to the total volume of the aerobic tank sewage source into which the organic wastewater sample is introduced; During the testing process of introducing the organic wastewater sample into the aerobic tank sewage source, testing to obtain a first total Kjeldahl nitrogen change amount. The nitrification inhibition rate is the ratio of the first total Kjeldahl nitrogen change amount to the blank total Kjeldahl nitrogen change amount; The test results meet the following: the ratio of the second denitrification rate to the first denitrification rate ≥ 0.9; the nitrification inhibition rate ≤ 10%; the ratio of the second COD removal rate to the first COD removal rate ≥ 0.9, and the organic wastewater meets the carbon source requirements.

2. The evaluation method of using organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that, The evaluation method further includes: Introducing demineralized water into the aerobic tank sewage source and testing to obtain a first phosphorus uptake rate; Introducing the organic wastewater sample into the aerobic tank sewage source and testing to obtain a second phosphorus uptake rate. The total volume of the aerobic tank sewage source into which the demineralized water is introduced is equal to the total volume of the aerobic tank sewage source into which the organic wastewater sample is introduced; The test results also meet the following: the ratio of the second phosphorus uptake rate to the first phosphorus uptake rate ≥ 0.

9.

3. The evaluation method of using organic wastewater as a carbon source for sewage treatment according to claim 1, wherein The chemical oxygen demand COD of the organic wastewater sample cr is 20,000 mg / L to 30,000 mg / L, and the biochemical oxygen demand BOD5 is 10,000 mg / L to 20,000 mg / L.

4. The evaluation method of using organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that The sewage sample meets at least one of the following conditions: (1) The initial total nitrogen value of the sewage sample is 30 mg / L to 50 mg / L; (2) The initial total phosphorus value of the sewage sample is 2 mg / L to 4 mg / L; (3) The initial chemical oxygen demand COD of the sewage sample cr is 150 mg / L to 300 mg / L.

5. The evaluation method of using organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that, The carbon source sample includes at least one of glucose, lactic acid, acetic acid, ethylene glycol, isopropanol, ethyl alkylphenol, and lignin.

6. The evaluation method of using organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that, The organic wastewater sample includes alcoholic organic wastewater.

7. The evaluation method of using organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that Based on the chemical oxygen demand as an equivalent, the introduction amount of the organic wastewater sample into the anoxic tank sewage source is 0.5 times to 2 times the introduction amount of the sewage sample.

8. The evaluation method of using organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that, Based on the chemical oxygen demand as an equivalent, the introduction amount of the organic wastewater sample into the aerobic tank sewage source is 0.5 times to 2 times the introduction amount of the sewage sample.

9. The evaluation method of using organic wastewater as a carbon source for sewage treatment according to any one of claims 1-8, characterized in that, Based on the chemical oxygen demand as an equivalent, the introduction amount of the carbon source sample into the anoxic tank sewage source is equal to the introduction amount of the organic wastewater sample into the anoxic tank sewage source.

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