Evaluation method for taking organic wastewater as sewage treatment carbon source

Abstract

The invention belongs to the technical field of sewage treatment, and provides an evaluation method for taking organic wastewater as a sewage treatment carbon source, which comprises the following steps: respectively testing the denitrification rate of an organic wastewater sample to an anoxic tank sewage source, and the nitration reaction inhibition rate and COD removal rate of the organic wastewater sample to an aerobic tank sewage source; and then testing the denitrification rate of the carbon source sample to the sewage source of the anoxic tank and the COD removal rate of the carbon source sample to the sewage source of the aerobic tank, thereby judging whether the organic wastewater meets the use requirements of the carbon source or not according to the test results of the organic wastewater sample and the carbon source sample. The evaluation method provided by the invention has the characteristics of simplicity, rapidness, accuracy and the like.

Description

Technical Field

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

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

[0003] Due to the low C / N and B / N ratios of urban domestic sewage, in order to improve the nitrogen and phosphorus removal efficiency during the sewage treatment process, additional carbon sources are needed to achieve standard discharge of 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 used as a substitute for carbon sources, it will not only reduce the treatment cost of organic wastewater, but also reduce the carbon source demand pressure 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 a technical problem that urgently needs to be solved. Summary of the invention

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

[0005] The present application provides a method for evaluating organic wastewater as a carbon source for sewage treatment, the evaluation method comprising:

[0006] The sewage sample and the anoxic tank sludge sample are mixed to obtain anoxic tank sewage source;

[0007] Passing a carbon source sample into the anoxic pool sewage source to obtain a first denitrification rate through testing;

[0008] Passing an organic wastewater sample into the anoxic pool sewage source to test and obtain a second denitrification rate;

[0009] The sewage sample and the aerobic tank sludge sample are mixed to obtain the aerobic tank sewage source;

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

[0011] Passing the organic wastewater sample into the aerobic pool sewage source, testing to obtain the nitrification reaction inhibition rate and the second COD removal rate;

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

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

[0014] Passing desalted water into the aerobic pool sewage source, testing to obtain a blank total Kjeldahl nitrogen change, the total volume of the aerobic pool sewage source passed into the desalted water being equal to the total volume of the aerobic pool sewage source passed into the organic wastewater sample;

[0015] During the test process of passing the organic wastewater sample into the aerobic pool sewage source, the first total Kjeldahl nitrogen change is obtained by testing, and the nitrification reaction inhibition rate is the ratio of the first total Kjeldahl nitrogen change to the blank total Kjeldahl nitrogen change.

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

[0017] Passing the organic wastewater sample into the aerobic pool sewage source, and testing to obtain a first phosphorus absorption rate;

[0018] Passing desalted water into the aerobic pool sewage source, testing to obtain a second phosphorus absorption rate, wherein the total volume of the aerobic pool sewage source passed into the desalted water is equal to the total volume of the aerobic pool sewage source passed into the organic wastewater sample;

[0019] The test results also satisfy that: the ratio of the first phosphorus absorption rate to the second phosphorus absorption rate is ≥ 0.9.

[0020] In some embodiments, the chemical oxygen demand (COD) of the organic wastewater sample is cr It is 20000mg / L~30000mg / L, and the biochemical oxygen demand BOD5 is 10000mg / L~20000mg / 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 is cr It is 150mg / L~300mg / L.

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

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

[0026] In some embodiments, based on chemical oxygen demand, the amount of the organic wastewater sample introduced into the anoxic tank sewage source is 0.5 to 2 times the amount of the sewage sample introduced.

[0027] In some embodiments, based on chemical oxygen demand, the amount of the organic wastewater sample introduced into the aerobic pool sewage source is 0.5 to 2 times the amount of the sewage sample introduced into the aerobic pool sewage source.

[0028] In some embodiments, based on chemical oxygen demand, the amount of the carbon source sample introduced into the anoxic tank sewage source is equal to the amount of the organic wastewater sample introduced into the anoxic tank sewage source.

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

[0030] This 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 organic wastewater can replace the carbon source in sewage treatment, thus avoiding the uncertainty of organic wastewater as a carbon source. In addition, there is no need to build a complete test equipment, and the feasibility of organic wastewater as a carbon source can be evaluated only by parameter detection and evaluation, which effectively reduces the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a graph showing changes in total nitrogen content in each test object in the denitrification test of the present application example.

[0032] Figure 2 This is a comparison chart of the denitrification rates of various test objects in the denitrification test of the embodiment of the present application.

[0033] Figure 3 This is a comparison chart of the nitrification reaction inhibition rate of each test object in the nitrification reaction inhibition rate test of the embodiment of the present application.

[0034] Figure 4 This is a graph showing changes 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 This is a graph showing the COD content changes of each test object in the COD removal rate test of the embodiment of the present application. DETAILED DESCRIPTION

[0036] Below in conjunction with the embodiments and examples, the present application is further described in detail. These embodiments and examples are only used to illustrate the present application and are not used to limit the scope of the present application. The purpose of providing these embodiments and examples is to make the understanding of the disclosure 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 violating the connotation of the present application, and the equivalent form obtained also falls within the protection scope of the present application. In addition, in the description below, a large number of specific details are given in order to provide a more comprehensive 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 those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0038] In this application, "optionally", "optional", and "optional" mean optional or dispensable, that is, any one of the two parallel schemes of "yes" or "no". If multiple "options" appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" is independent.

[0039] In this application, the terms "first", "second", etc. in "the first aspect", "the second aspect", etc. are used only 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 enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0040] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0041] In the present application, when it comes to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values ​​in the numerical interval is considered to be continuous, and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical interval, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to an integer in the numerical interval, it includes the two endpoint integers of the numerical range, and 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 range disclosed in the present application should be understood to include any and all sub-ranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. "Numerical interval" allows for a broad range of quantitative intervals such as percentage intervals, ratio intervals, and ratio intervals.

[0042] All documents mentioned in this application are cited as references in this application, just as each document is cited as reference separately. Unless they conflict with the application purpose and / or technical solution of this application, the cited documents involved in this application are cited with all contents and all purposes. When the cited documents are involved in this application, the definitions of relevant technical features, terms, nouns, phrases, etc. in the cited documents are also cited. When the cited documents are involved in this application, the examples and preferred methods of the cited relevant technical features can also be incorporated into this application as references, but are limited to the implementation of this application. It should be understood that when the cited content conflicts with the description in this application, the present application shall prevail or be modified adaptively according to the description of this application.

[0043] In traditional technology, for a certain organic wastewater to replace the carbon source of a sewage treatment plant, multiple adjustments and attempts are needed to ensure the treatment effect of the sewage treatment. It is also possible that during multiple experiments, it is found that the organic wastewater does not meet the requirements as a carbon source. The whole process is not only time-consuming but also costly.

[0044] The present application provides a method for evaluating organic wastewater as a carbon source for sewage treatment, the evaluation method comprising:

[0045] The sewage sample and the anoxic tank sludge sample are mixed to obtain anoxic tank sewage source;

[0046] Passing a carbon source sample into the anoxic pool sewage source to obtain a first denitrification rate through testing;

[0047] Passing an organic wastewater sample into the anoxic pool sewage source to test and obtain a second denitrification rate;

[0048] The sewage sample and the aerobic tank sludge sample are mixed to obtain the aerobic tank sewage source;

[0049] Passing the carbon source sample into the aerobic pool sewage source, and testing to obtain a first COD removal rate;

[0050] The organic wastewater sample is introduced into the aerobic pool sewage source, and the nitrification reaction inhibition rate and the second COD removal rate are tested to obtain.

[0051] The test results meet the following requirements: the ratio of the second denitrification rate to the first denitrification rate is ≥0.9; the ratio of the nitrification reaction inhibition rate is ≤10%; the ratio of the second COD removal rate to the first COD removal rate is ≥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, and compares the test results with those of conventional carbon sources to determine whether organic wastewater can replace the carbon source in sewage treatment, thus avoiding the uncertainty of organic wastewater as a carbon source. In addition, there is no need to build a complete test equipment, and the feasibility of organic wastewater as a carbon source can be evaluated only by parameter detection and evaluation, which effectively reduces the test cost.

[0053] It is understandable that the denitrification rate, nitrification inhibition rate and COD removal rate of the organic wastewater controlled in the present application are close to the test results of the existing carbon source 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 to 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 inhibition rate is 0 to 10%. The ratio of the second nitrification inhibition rate to the first nitrification 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 is understandable that the content of the aerobic pool sewage source and the anoxic pool sewage source is not specifically required or limited in this application, and appropriate sewage samples, aerobic pool sludge samples and anoxic pool sludge samples can be selected according to different sewage treatment requirements. During the test, the aerobic pool sewage source and the anoxic pool sewage source selected for the organic wastewater sample and the carbon source sample should be consistent, for example, the parameters such as pH and dissolved oxygen should remain the same.

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

[0056] Passing desalted water into the aerobic pool sewage source, testing to obtain a blank total Kjeldahl nitrogen change, the total volume of the aerobic pool sewage source passed into the desalted water being equal to the total volume of the aerobic pool sewage source passed into the organic wastewater sample;

[0057] During the test process of passing the organic wastewater sample into the aerobic pool sewage source, the first total Kjeldahl nitrogen change is obtained by testing, and the nitrification reaction inhibition rate is the ratio of the first total Kjeldahl nitrogen change to the blank total Kjeldahl nitrogen change.

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

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

[0060] Passing the organic wastewater sample into the aerobic pool sewage source, and testing to obtain a first phosphorus absorption rate;

[0061] Passing desalted water into the aerobic pool sewage source, testing to obtain a second phosphorus absorption rate, wherein the total volume of the aerobic pool sewage source passed into the desalted water is equal to the total volume of the aerobic pool sewage source passed into the organic wastewater sample;

[0062] The test result also satisfies: a ratio of the first phosphorus absorption rate to the second phosphorus absorption rate is ≥ 0.9, for example, it may be 0.90, 0.95, 1.00, 1.05 or 1.10.

[0063] The present application further tests the phosphorus absorption rate of the organic wastewater sample added to the aerobic pool sewage source, thereby effectively ensuring 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 is cr It can be 20000mg / L to 30000mg / L, for example, 20000mg / L, 21000mg / L, 22000mg / L, 23000mg / L, 24000mg / L, 25000mg / L, 26000mg / L, 27000mg / L, 28000mg / L, 29000mg / L or 30000mg / L.

[0065] In some embodiments, the biochemical oxygen demand BOD5 of the organic wastewater sample is 10000 mg / L~20000 mg / L, for example, it can be 10000 mg / L, 11000 mg / L, 12000 mg / L, 13000 mg / L, 14000 mg / L, 15000 mg / L, 16000 mg / L, 17000 mg / L, 18000 mg / L, 19000 mg / L or 20000 mg / L.

[0066] The chemical oxygen demand (COD) of the organic wastewater sample selected in this application is as above. cr and 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~50 mg / L.

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

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

[0070] This application selects the initial total nitrogen value, initial total phosphorus value and initial chemical oxygen demand COD of the sewage sample as above cr , it has a better sewage treatment effect for replacing carbon sources for 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 phenol and lignin.

[0072] In some embodiments, the organic wastewater sample comprises wine organic wastewater.

[0073] In some embodiments, based on chemical oxygen demand, the amount of the organic wastewater sample introduced into the anoxic tank sewage source is 0.5 to 2 times the amount of the sewage sample introduced.

[0074] In some embodiments, based on chemical oxygen demand, the amount of the organic wastewater sample introduced into the aerobic pool sewage source is 0.5 to 2 times the amount of the sewage sample introduced.

[0075] In some embodiments, based on chemical oxygen demand, the amount of the carbon source sample introduced into the anoxic tank sewage source is equal to the amount of the organic wastewater sample introduced into the anoxic tank sewage source.

[0076] The embodiments of the present application will be described in detail below in conjunction with examples. It should be understood that these examples are only used to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are preferably referred to the guidance provided in the present application, and can also be based on the experimental manual or normal conditions in this area, can also be based on the conditions recommended by the manufacturer, or refer to experimental methods known in the art.

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

[0078]

[0079] Example 1

[0080] (1) Denitrification rate test

[0081] The activated sludge in the anoxic tank was taken as the anoxic tank sludge sample, and the sewage sample and the carbon source were introduced for denitrification treatment. The volume of the anoxic tank sludge sample added was 400 mL, and the total experimental volume after the sewage sample and the carbon source were added was 800 mL.

[0082] The denitrification rates were tested when the following carbon sources were added:

[0083] (1) Chemical oxygen demand (COD) cr The addition ratio of the composite carbon source was 1 times the influent COD. The composite carbon source was diluted 2475 times before use, and group 1 was numbered as the control.

[0084] (2) Add COD cr The brewing wastewater with a concentration of 26250 mg / L was used as the carbon source. In order to ensure that the addition ratio of brewing wastewater was 1 times the equivalent of the influent COD, the brewing wastewater was diluted 117 times for use and numbered as Experimental Group 3. Similarly, after dilution, the brewing wastewater was added at 0.5 times, 1.5 times and 2 times the influent COD of the sewage sample, and numbered as Experimental Group 2, Experimental Group 4 and Experimental Group 5 respectively.

[0085] The results of the denitrification test are shown in Table 1, where the total nitrogen (NO2 - -N+NO3 - -N) content as Figure 1As shown, the comparison of denitrification rates among control group 1, test group 2, test group 3, test group 4 and test group 5 is shown in Figure 2 shown.

[0086] Table 1

[0087]

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

[0089] It can be seen from the above table that when the brewing wastewater dosage is the influent COD Cr When the dosage of carbon source is 1 times of influent COD Cr When the brewing wastewater is diluted 117 to 58 times, the denitrification rate increases with the influent COD Cr The denitrification rate of the brewing wastewater increases with the increase of concentration, and meets the carbon source requirements.

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

[0091] The sludge in the aerobic tank is selected as the aerobic tank sludge sample, the sewage sample is passed into the aerobic tank sludge sample, and the organic wastewater sample is passed into the aerobic tank sludge sample for nitrification treatment. After the nitrification treatment, the total Kjeldahl nitrogen value and the total phosphorus value of the sewage sample are obtained by testing, wherein the amount of the aerobic tank sludge sample added is 1000 mL, and the total experimental volume after adding the sewage sample and the organic wastewater sample is 2000 mL;

[0092] Specifically, a desalted water addition group was first set up for control, numbered as control group 1, and then the dilution multiples of the added brewing wastewater were set to 50 times, 100 times, 200 times and 500 times, respectively, numbered as test group 2, test group 3, test group 4 and test group 5, to investigate the effect of brewing wastewater as a 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 the control group 1, the initial TKN is recorded as A1, and the final TKN is recorded as A2. The initial TKN of the experimental group is recorded as B1, and the final TKN is recorded as B2. Then the nitrification reaction inhibition rate = (B1-B2) / (A1-A2). Phosphorus absorption rate = (total phosphorus value before reaction-total phosphorus value after reaction) / time. Taking the experimental group 2 as an example, the phosphorus absorption rate = (4.55mg / L-3.25mg / L) / 2h=0.65mg / (L·h).

[0096] From the table above, we can see that in the nitrification inhibition test, the initial theoretical value of TKN of each system is 40 mg / L, and the actual 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 period, the final TKN value in each reaction system and the inhibition rate of the nitrification reaction of the system by adding organic wastewater as a carbon source are shown in the figure below. Figure 3 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, the changes in TP concentration in the reaction system were measured during the nitrification inhibition test, e.g. Figure 4 As shown, the results showed that the phosphorus absorption rate increased with the increase of dilution multiple.

[0098] (3) COD removal rate test

[0099] The sludge in the aerobic tank is selected as the sludge sample, the sewage sample is passed into the aerobic tank sludge sample, and the organic wastewater sample is passed at the same time, and the treated chemical oxygen demand (COD) of the sewage sample is obtained after oxidation treatment. cr Among them, the amount of aerobic tank sludge sample added was 1000mL, and the total experimental volume was 2000mL after adding sewage sample and carbon source.

[0100] A blank group 1, a composite carbon source addition test group 2, a test group 3 with organic wastewater added as a carbon source (brewing wastewater 1 was diluted about 118 times), and a test group 4 (brewing wastewater 2 was diluted about 59 times) were set up. The test results are shown in Table 3.

[0101] Table 3

[0102]

[0103] Through the above table, combined with Figure 5 It can be seen that after using brewing wastewater to replace carbon source, the biodegradability of brewing wastewater is not lower than that of composite carbon source, and its COD CrThe removal rate is not lower than that of the composite carbon source. Cr When the organic wastewater is diluted 117 to 58 times, the denitrification rate increases with the influent COD Cr The concentration increases. According to the research results on the inhibitory effect of different dilution ratios of organic wastewater on nitrification rate and phosphorus removal rate, when the organic wastewater is diluted 100 times or more, the use of alcoholic wastewater as a supplementary carbon source for sewage treatment plants will not have a significant inhibitory effect on nitrification reaction and phosphorus removal efficiency. Based on the above comprehensive test results, the recommended dosage of organic wastewater is the influent COD Cr In addition, under this dilution concentration condition, the organic wastewater has a significant effect on COD Cr There is no significant effect on the removal rate and activated sludge oxygen consumption rate. Moreover, according to the test of the sewage treatment plant, the brewing wastewater evaluated by this application can be used as a carbon source for sewage treatment.

[0104] Therefore, the organic wastewater in this application meets the requirements of denitrification rate, nitrification reaction inhibition rate, phosphorus absorption rate and COD removal rate, which means that the organic wastewater can be used as a carbon source. Cr Under equivalent conditions, the organic wastewater can achieve a denitrification effect similar to or better than that of traditional carbon sources; and it will not affect the nitrification reaction, phosphorus absorption 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 organic wastewater, and compares the test results with those of conventional carbon sources to determine whether organic wastewater can replace the carbon source in sewage treatment, thereby avoiding the uncertainty of organic wastewater as a carbon source. In addition, there is no need to build a complete test equipment, and the feasibility of organic wastewater as a carbon source can be evaluated only by parameter detection and evaluation, which effectively reduces the test cost.

[0106] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0107] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for evaluating organic wastewater as a carbon source for sewage treatment, characterized in that: The evaluation method includes: The sewage sample and the anoxic tank sludge sample are mixed to obtain anoxic tank sewage source; Passing a carbon source sample into the anoxic pool sewage source to obtain a first denitrification rate through testing; Passing an organic wastewater sample into the anoxic pool sewage source to test and obtain a second denitrification rate; The sewage sample and the aerobic tank sludge sample are mixed to obtain the aerobic tank sewage source; Passing the carbon source sample into the aerobic pool sewage source, and testing to obtain a first COD removal rate; Passing the organic wastewater sample into the aerobic pool sewage source, testing to obtain the nitrification reaction inhibition rate and the second COD removal rate; The test results meet the following requirements: the ratio of the second denitrification rate to the first denitrification rate is ≥0.9; the nitrification reaction inhibition rate is ≤10%; the ratio of the second COD removal rate to the first COD removal rate is ≥0.9, and the organic wastewater meets the carbon source requirements.

2. The method for evaluating organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that: The testing method of the nitrification reaction inhibition rate includes: Passing desalted water into the aerobic pool sewage source, testing to obtain a blank total Kjeldahl nitrogen change, the total volume of the aerobic pool sewage source passed into the desalted water being equal to the total volume of the aerobic pool sewage source passed into the organic wastewater sample; During the test process of passing the organic wastewater sample into the aerobic pool sewage source, the first total Kjeldahl nitrogen change is obtained by testing, and the nitrification reaction inhibition rate is the ratio of the first total Kjeldahl nitrogen change to the blank total Kjeldahl nitrogen change.

3. The method for evaluating organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that: The evaluation method further comprises: Passing desalted water into the aerobic pool sewage source, and testing to obtain a first phosphorus absorption rate; Passing the organic wastewater sample into the aerobic pool sewage source, testing to obtain a second phosphorus absorption rate, wherein the total volume of the aerobic pool sewage source passed into the desalted water is equal to the total volume of the aerobic pool sewage source passed into the organic wastewater sample; The test results also satisfy that: the ratio of the second phosphorus absorption rate to the first phosphorus absorption rate is ≥ 0.

9.

4. The method for evaluating organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that: Chemical oxygen demand (COD) of the organic wastewater sample cr It is 20000mg / L~30000mg / L, and the biochemical oxygen demand BOD5 is 10000mg / L~20000mg / L.

5. The method for evaluating 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~50 mg / L; (2) The initial total phosphorus value of the sewage sample is 2 mg / L~4 mg / L; (3) Initial chemical oxygen demand (COD) of the sewage sample cr It is 150mg / L~300mg / L.

6. The method for evaluating 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 phenol and lignin.

7. The method for evaluating organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that: The organic wastewater sample includes alcoholic organic wastewater.

8. The method for evaluating organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that: Calculated in terms of chemical oxygen demand, the amount of the organic wastewater sample introduced into the anoxic pool sewage source is 0.5 to 2 times the amount of the sewage sample introduced.

9. The method for evaluating organic wastewater as a carbon source for sewage treatment according to claim 1, characterized in that: Calculated in terms of chemical oxygen demand, the amount of the organic wastewater sample introduced into the aerobic pool sewage source is 0.5 to 2 times the amount of the sewage sample introduced.

10. The method for evaluating organic wastewater as a carbon source for sewage treatment according to any one of claims 1 to 9, characterized in that: Calculated in terms of chemical oxygen demand, the amount of the carbon source sample introduced into the sewage source of the anoxic tank is equal to the amount of the organic wastewater sample introduced into the sewage source of the anoxic tank.

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