Regulation and control feeding method for anaerobic treatment of sewage

Abstract

The invention provides a regulation and control feeding method for sewage anaerobic treatment, and relates to the field of sewage treatment.The method comprises the steps of sample pretreatment, water distribution, solution titration, data calculation and production regulation, the detection means is simple and easy to understand, the safety is higher, the detection result is accurate and stable, the detection time can be effectively shortened, the state of sewage anaerobic treatment can be displayed in real time, and the detection efficiency is improved. The actual production process is effectively guided, next-step production is carried out with a more reasonable sewage feeding amount, the work efficiency of sewage anaerobic treatment is improved, and the economic benefit and the sewage treatment effect of the sewage treatment process are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a regulating and adding method for anaerobic sewage treatment. Background Art

[0002] Sewage treatment is one of the important tasks to protect the environment and safeguard human health. Anaerobic biological treatment technology is a common and effective treatment method in the sewage treatment industry, which has significant advantages in reducing the organic content in sewage and reducing energy consumption.

[0003] In the process of anaerobic sewage treatment, the amount of sewage added needs to be adjusted according to the actual situation of the sewage anaerobic system to achieve higher economic benefits and good sewage treatment effects. It is necessary to test the sewage that has been anaerobically digested, and make more reasonable adjustments to the amount of sewage added according to the test results to ensure the efficiency and effect of the sewage treatment process. However, traditional sewage anaerobic testing methods often have many limitations.

[0004] For example, the existing chemical detection methods need to measure volatile acid, chemical oxygen demand, biochemical oxygen demand, pH, alkalinity, etc. When measuring biochemical oxygen demand, it is necessary to activate the microorganisms in the sewage by heating, and then measure the amount of oxygen consumed by the active microorganisms in a specific time to evaluate the biochemical oxygen demand in the sewage. This process includes heating, cooling, adding indicators and titration. When measuring volatile acid, it is also necessary to go through heating distillation, cooling, adding indicators and titration. Then, the mass concentration of volatile acid is calculated, and the data obtained by traditional measurement methods are analyzed to make adjustments to the next production process. These data can provide information and guide production, but the test operation process is complicated and time-consuming. It is difficult to reflect the dynamic changes of the anaerobic treatment process, and there are safety hazards.

[0005] Although existing microbiological detection methods can reveal the structure and function of microbial communities in anaerobic treatment at the microscopic level, such methods have high requirements on experimental conditions and techniques and are not practical for industrial production. In addition, the accuracy and repeatability of the detection and analysis results are easily affected by various factors and are not stable.

[0006] Traditional testing methods either have high labor costs or unstable test results. When used in actual production, the efficiency is not high enough, which brings inconvenience to actual production. Summary of the invention

[0007] In view of the above-mentioned problems existing in the prior art, the present invention provides a method for regulating and adding materials for anaerobic treatment of sewage. The detection means are simple and easy to understand, the detection results are accurate and stable, the detection time can be greatly reduced, the anaerobic treatment status of sewage can be displayed in real time, and the actual anaerobic production of sewage can be effectively guided. The next step of production can be carried out with a more reasonable sewage addition amount, which effectively improves the work efficiency of anaerobic production of sewage and ensures the economic benefits and sewage treatment effect of the sewage treatment process.

[0008] In order to achieve the above object, the present invention provides the following technical solution: a method for regulating and adding materials for anaerobic treatment of sewage, characterized in that it comprises the following steps:

[0009] (1) Sample pretreatment: Collect sewage samples and perform filtering pretreatment operations on them;

[0010] (2) Water preparation: Prepare water according to the volume ratio of the filtered sewage sample to deionized water of 1:9, stir and measure the pH value of the solution in real time;

[0011] (3) Solution titration: Titrate the solution with 0.1N acid. When the pH value of the solution reaches 5, record the volume of the acid added (V). 1 ml; continue to titrate the solution with acid, and record the volume V of the acid added when the pH value of the solution increases from 5 to 4.4. 2 ml;

[0012] (4) Calculation data: Substitute into the formula, A = (V 2 ×1.66-0.15)×500, B=V 1 ×250, calculate the A / B value;

[0013] (5) Production control: In the sewage anaerobic system, sewage is added to the anaerobic treatment tank for anaerobic treatment. The original amount of sewage added is D 0 Cubic meters / day, D 0 The effective volume of the anaerobic reaction tank is 10%, the dosage change value is a cubic meter / day, and the sewage dosage after the Xth regulation is D X Cubic meters / day;

[0014] When X=1, D 1 =D 0 ;

[0015] When X≥2, adjust D according to the A / B value measured at the X-1th time. X as follows:

[0016] When A / B≤0.1, increase the amount of sewage added. At this time, a is 5%-10% of the effective volume of the anaerobic reaction tank. X =D X-1 +a;

[0017] When 0.1<A / B≤0.2, increase the amount of sewage added. At this time, a is 2%-5% of the effective volume of the anaerobic reaction tank. X =D X-1 +a;

[0018] When 0.2<A / B≤0.4, the amount of sewage added is adjusted according to the actual production. At this time, a is taken as 0-2% of the effective volume of the anaerobic reaction tank, D X =D X-1 ±a;

[0019] When 0.4<A / B≤0.5, reduce the amount of sewage added. At this time, a is 2%-5% of the effective volume of the anaerobic reaction tank. X =D X-1 -a;

[0020] When A / B>0.5, stop adding sewage. At this time, D X =0.

[0021] Preferably, in the solution titration step, the acid is 0.05 mol / L sulfuric acid.

[0022] The beneficial effect of the present invention is that the present invention obtains the state of the sewage anaerobic production process by detecting and analyzing the A / B value, and regulates the sewage dosage in the sewage anaerobic system. Compared with the traditional method, the detection means of the present invention is simple and easy to understand, has higher safety, and the detection results are accurate and stable. It can effectively shorten the detection time, and display the state of sewage anaerobic treatment in real time. It can effectively guide the actual sewage anaerobic production work, carry out the next step of production with a more reasonable sewage dosage, improve the work efficiency of sewage anaerobic treatment, and ensure the economic benefits and sewage treatment effect of the sewage treatment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a comparison chart of volatile acids and A / B values ​​provided by an embodiment of the present invention;

[0024] Figure 2 is a test data graph provided by an embodiment of the present invention;

[0025] Figure 3 It is a test data diagram provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below. The examples given are only used to explain the present invention but not to limit the scope of the present invention.

[0027] The embodiment of the present invention provides a method for regulating and adding materials for anaerobic treatment of sewage, wherein sewage to be treated is continuously added into an anaerobic reaction tank until the sewage overflows from the top of the anaerobic reaction tank, and the sewage is sampled and tested.

[0028] The test involves the following steps:

[0029] (1) Sample pretreatment: Collect sewage samples and immediately filter and pretreat them;

[0030] (2) Water preparation: Prepare water according to the volume ratio of the filtered sewage sample to deionized water of 1:9, stir and measure the pH value of the solution in real time;

[0031] (3) Solution titration: Titrate the solution with 0.1N acid. When the pH value of the solution reaches 5, record the volume of the acid added (V). 1 ml; continue to titrate the solution with acid and record the volume V of the acid added when the pH value of the solution increases from 5 to 4.4 2 ml;

[0032] (4) Calculation data: Substitute into the formula, A = (V 2 ×1.66-0.15)×500, B=V 1 ×250, calculate the A / B value;

[0033] (5) Production control: In the sewage anaerobic system, sewage is added to the anaerobic treatment tank for anaerobic treatment. The original amount of sewage added is D 0 Cubic meters / day, D 0 The effective volume of the anaerobic reaction tank is 10%, the dosage change value is a cubic meter / day, and the sewage dosage after the Xth regulation is D X Cubic meters / day;

[0034] When X=1, D 1 =D 0 ;

[0035] When X≥2, adjust D according to the A / B value measured at the X-1th time. X as follows:

[0036] When A / B≤0.1, increase the amount of sewage added. At this time, a is 5%-10% of the effective volume of the anaerobic reaction tank. X =D X-1 +a;

[0037] When 0.1<A / B≤0.2, increase the amount of sewage added. At this time, a is 2%-5% of the effective volume of the anaerobic reaction tank. X =D X-1 +a;

[0038] When 0.2<A / B≤0.4, the amount of sewage added is adjusted according to the actual production. At this time, a is taken as 0-2% of the effective volume of the anaerobic reaction tank, D X =D X-1 ±a;

[0039] When 0.4<A / B≤0.5, reduce the amount of sewage added. At this time, a is 2%-5% of the effective volume of the anaerobic reaction tank. X =D X-1 -a;

[0040] When A / B>0.5, stop adding sewage. At this time, D X =0.

[0041] In this embodiment, the wastewater used in the production test process is tylosin wastewater.

[0042] Tylosin wastewater has a complex composition, containing toxic substances such as difficult-to-biodegrade substances, antibiotics with antibacterial effects, and high sulfate concentration, so sulfuric acid is selected as the acid in the solution titration step.

[0043] The effective volume of the anaerobic reaction tank is 5000 cubic meters, D 0 =500 cubic meters / day.

[0044] Therefore, the original sewage dosage is set at 500 cubic meters per day. In actual production, the initial sewage flow rate is set at 20.83 cubic meters per hour.

[0045] Tylosin wastewater was continuously added to the anaerobic reaction tank at a flow rate of 20.83 cubic meters per hour. When the sewage began to overflow from the top of the anaerobic system, the sewage was collected and tested for the first time. Subsequently, the sewage was collected and tested every 24 hours.

[0046] First, filter the collected sewage samples for pretreatment to remove impurities and large particles to reduce interference with subsequent testing; take 20ml of filtered sewage sample and add 180ml of deionized water to it; use a magnetic stirrer to fully stir the solution after water preparation, and connect a pH meter to test the pH value of the solution; titrate the solution with 0.05mol / L sulfuric acid, and when the pH value of the solution reaches 5, record the volume of sulfuric acid V dripped 1 ml, add sulfuric acid to the solution again, and record the volume V of the acid added when the pH value of the solution increases from 5 to 4.4. 2 ml; V 1 and V 2 Substituting into the formula, A=(V 2 ×1.66-0.15)×500, B=V 1 ×250, and calculate the value of A / B; according to the above steps, the value of A / B is determined, and the corresponding volatile acid value is measured at the same time, and the anaerobic production of sewage is regulated according to the A / B value.

[0047] In the actual production process, anaerobic treatment of sewage can not only remove organic waste that pollutes the environment and nutrients such as nitrogen and phosphorus that cause eutrophication pollution, but also produce biogas, which can be used as energy for production. Therefore, when adjusting the amount of sewage added, not only the amount of sewage treated in one day should be considered, but also the amount of biogas produced.

[0048] The following table is part of the test data:

[0049]

[0050] Since the sewage flow rate (cubic meters / hour) is needed to calculate the sewage dosage D X (m3 / day), which will make D X The value of may fluctuate, but this fluctuation will not affect the final result.

[0051] From the table data, we can know that in the first test, D 1 The volume of biogas produced is 553 cubic meters per day, A / B is 0.08, A / B≤0.1, so the amount of sewage added should be increased in the next test, a is 5%-10% of the effective volume of the anaerobic reaction tank, a is 500, D 2 =D 1 +500;

[0052] Second test, D 2 The volume of biogas produced is 549 cubic meters, A / B is 0.12, 0.1<A / B≤0.2, so the amount of sewage added should be increased in the next test, a is 2%-5% of the effective volume of the anaerobic reaction tank, a is 250, D 3 =D 2 +250;

[0053] The third test, D 3 The volume of biogas produced is 1201 cubic meters / day, and the volume of biogas produced is 1247 cubic meters. A / B is 0.20, and 0.1<A / B≤0.2. Therefore, the amount of sewage added should be increased in the next test. The value of a is 2%-5% of the effective volume of the anaerobic reaction tank. The value of a is 200, and D 4 =D 3 +200;

[0054] The fourth test, D 4 The biogas produced is 1425 cubic meters / day, and the biogas produced is 1292 cubic meters. A / B is 0.25, 0.2<A / B≤0.4, a is 0-2% of the effective volume of the anaerobic reaction tank, and the range of a is -100≤a≤100. In the next test, a is 100, D 5 =D 4 +100;

[0055] The fifth test, D 5 The biogas produced is 1533 cubic meters / day, and the biogas produced is 2016 cubic meters. A / B is 0.35, 0.2<A / B≤0.4, a is 0-2% of the effective volume of the anaerobic reaction tank, and the range of a is -100≤a≤100. In the next test, a is 100, D 6 =D 5 +100;

[0056] The sixth test, D 6 The biogas produced is 1643 cubic meters / day, and the biogas produced is 1988 cubic meters. A / B is 0.4, 0.2<A / B≤0.4, a is 0-2% of the effective volume of the anaerobic reaction tank, and the range of a is -100≤a≤100. In the next test, a is 100, D 7 =D 6 +100;

[0057] The results of the first six tests show that when 0.2<A / B≤0.4, the amount of biogas produced is relatively high while ensuring a high sewage treatment volume. When A / B≤0.2, the amount of sewage treated is small and the amount of biogas produced is also small. Therefore, when A / B≤0.2, the amount of sewage added should be increased to reach 0.2<A / B≤0.4.

[0058] The 7th test, D 7 The volume of biogas produced is 1763 cubic meters / day, and the volume of biogas produced is 1377 cubic meters. A / B is 0.47, and 0.4<A / B≤0.5. Therefore, the next step is to reduce the amount of sewage added. The value of a is 2%-5% of the effective volume of the anaerobic reaction tank. The value of a is 200, so D 8 =D 7 -a;

[0059] The 8th test, D 8 It is 1587 cubic meters / day, the amount of biogas produced is 1821 cubic meters, A / B is 0.36, 0.2<A / B≤0.4;

[0060] The seventh test shows that when 0.4<A / B≤0.5, compared with 0.2<A / B≤0.4, although the sewage treatment capacity has increased, the amount of biogas produced has decreased, which will damage the economic benefits and is not conducive to actual production. Therefore, the eighth test, based on the seventh test, according to the formula, reduced the dosage, a value of 200, D 8It is 1587 cubic meters / day, and the amount of biogas produced is 1821 cubic meters. By comparing the test data of the 7th and 8th times, it can be known that the amount of biogas produced by treating relatively less sewage in the 8th time is more than that of treating relatively more sewage in the 7th time, and the economic benefits are higher. Therefore, when 0.2<A / B≤0.4, while ensuring the maximum amount of sewage treatment, as much biogas as possible can be obtained, which can not only efficiently treat sewage, but also achieve good economic benefits, and bring higher economic benefits. Therefore, in actual production, it should be controlled at 0.2<A / B≤0.4.

[0061] When A / B>0.5, the next step of regulation is to stop adding sewage.

[0062] Based on the 8th test, this embodiment conducted the 9th test, directly increasing the dosage of 500 to the original anaerobic treatment tank. 9 The 9th test shows that if sewage is continuously added to the anaerobic reaction tank, the amount of biogas produced will begin to decrease, which will damage economic benefits and be detrimental to actual production. Only pursuing high sewage treatment volume without considering biogas production does not meet actual production requirements. Therefore, when A / B>0.5, stop adding sewage.

[0063] As attached Figure 2 and attached Figure 3 As shown, the first test corresponds to the 1st day of verification data, the second test corresponds to the 4th day of verification data, the third test corresponds to the 14th day of verification data, the 4th test corresponds to the 19th day of verification data, the 5th test corresponds to the 26th day of verification data, the 6th test corresponds to the 32nd day of verification data, the 7th test corresponds to the 42nd day of verification data, the 8th test corresponds to the 46th day of verification data, and the 9th test corresponds to the 56th day of verification data.

[0064] According to the value of A / B, the amount of sewage added is continuously regulated to generate as much biogas as possible while ensuring that more sewage is treated. Through the detection data of this embodiment, it can be learned that as the amount of sewage added continues to increase, the amount of biogas generated first increases and then decreases. When the sewage addition amount is maintained at 1500 cubic meters / day, it can ensure that more sewage can be treated and more biogas can be generated, which can ensure sewage treatment efficiency and higher economic benefits, so the sewage control amount is finally maintained at 1500 cubic meters / day.

[0065] In traditional detection methods, one of the most commonly detected indicators is volatile acid. Volatile acid is an intermediate product of the anaerobic process of sewage. Methanogens mainly use volatile acid to form methane, which is the main component of biogas. A high concentration of volatile acid will inhibit methanogens. Therefore, the accumulation of volatile acid in the anaerobic reactor can reflect the inactive state of methanogens or the deterioration of the operating conditions of the reactor, and then reflect the state of the anaerobic production process of sewage. If the volatile acid content is relatively low, it means that the methanogens are more active, and the amount of sewage added should be increased to produce more volatile acid. If the volatile acid content is relatively high, it means that the methanogens are not active and the amount of sewage added is sufficient, so it is necessary to reduce or suspend the addition of more sewage.

[0066] In this embodiment, when the A / B value is measured, the content of volatile acid is also detected at the same time.

[0067] Attached Figure 1 The relationship between the volatile acid and the A / B value of this example is reflected. The horizontal axis in the figure represents the number of production test days (unit: day), and the vertical axis has two indicators, the left side represents the volatile acid content (unit: mg / L), and the right side represents the A / B value.

[0068] According to the attached Figure 1 It can be seen that the broken line representing the volatile acid content is basically consistent with the broken line representing the A / B value. It can be proved that for the same kind of anaerobic treated sewage, the conclusion can be drawn by analyzing the volatile acid content, and the same conclusion can be drawn by analyzing the A / B value. This means that the A / B value can reflect the state of the anaerobic production process of sewage like volatile acid.

[0069] The present invention has the following advantages over the traditional method:

[0070] 1. The detection method is simple and easy to understand, and the test results are accurate and stable.

[0071] 2. The detection time is short, and it can display the status of sewage anaerobic treatment in real time, adjust the production process parameters in time, optimize the reaction conditions, more accurately control the production process, and effectively improve the work efficiency of sewage anaerobic treatment.

[0072] 3. The detection method is safer.

[0073] 4. Based on the test results, effectively guide the actual sewage anaerobic production work, and carry out the next step of production with a more reasonable sewage dosage in actual production, avoid unnecessary energy and chemical agent consumption, save energy and reduce emissions, reduce environmental pollution, and effectively improve the efficiency of sewage anaerobic production, ensuring the economic benefits of the sewage treatment process and the sewage treatment effect.

[0074] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for regulating and adding materials for anaerobic treatment of sewage, characterized in that The steps include: (1) Sample pretreatment: Collect sewage samples after anaerobic treatment and perform filtration pretreatment on them; (2) Water preparation: Prepare water according to the volume ratio of the filtered sewage sample to deionized water of 1:9, stir and measure the pH value of the solution in real time; (3) Solution titration: Titrate the solution with 0.1N acid. When the pH value of the solution reaches 5, record the volume of the acid added (V1ml). Continue to titrate the solution with acid. When the pH value of the solution increases from 5 to 4.4, record the volume of the acid added (V2ml). (4) Calculation data: Substitute into the formula, A = (V2 × 1.66-0.15) × 500, B = V1 × 250, calculate the A / B value; (5) Production control: In the sewage anaerobic system, sewage is added to the anaerobic treatment tank for anaerobic treatment. The original sewage dosage is D0 cubic meters / day, D0 is 10% of the effective volume of the anaerobic reaction tank, the dosage change value is a cubic meters / day, and the sewage dosage after the Xth regulation is D X Cubic meters / day; When X=1, D1=D0; When X≥2, adjust D according to the A / B value measured at the X-1th time. X as follows: When A / B≤0.1, increase the amount of sewage added. At this time, a is 5%-10% of the effective volume of the anaerobic reaction tank. X =D X-1 +a; When 0.1<A / B≤0.2, increase the amount of sewage added. At this time, a is 2%-5% of the effective volume of the anaerobic reaction tank. X =D X-1 +a; When 0.2<A / B≤0.4, the amount of sewage added is adjusted according to the actual production. At this time, a is taken as 0-2% of the effective volume of the anaerobic reaction tank, D X =D X-1 ±a; When 0.4<A / B≤0.5, reduce the amount of sewage added. At this time, a is 2%-5% of the effective volume of the anaerobic reaction tank. X =D X-1 -a; When A / B>0.5, stop adding sewage. At this time, D X =0.

2. The method for controlling and adding materials for anaerobic treatment of sewage according to claim 1, characterized in that: In the solution titration step, the acid is 0.05 mol / L sulfuric acid.

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