A water treatment agent and sewage treatment system that simultaneously promotes anaerobic and denitrification

Abstract

The invention relates to the technical field of sewage treatment, and discloses a water treatment agent for promoting anaerobic and denitrification at the same time, comprising a mixed liquid of ascorbic acid and glucose, wherein the mass ratio of ascorbic acid to glucose is 1:0.4-0.5; a preparation method of the water treatment agent comprises the following steps: 1) ascorbic acid and glucose are put into a ball mill according to a proportion and mixed evenly; 2) mixed powder of ascorbic acid and glucose is taken and mixed with clean water, and a protective agent is added to the water sample, and the pH is controlled to be 3-4, wherein the mass ratio of the ascorbic acid and glucose mixed powder to the clean water is 1:7; the water treatment agent promotes an anaerobic system to use anaerobic microorganisms as the dominant flora, and simultaneously performs denitrification, so that anaerobic and denitrification are performed in the same reactor, thereby reducing the floor space and the treatment cost.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment equipment, and in particular to a water treatment agent and a sewage treatment system that simultaneously promotes anaerobic and denitrification. Background Art

[0002] Industrial wastewater includes production wastewater, production sewage and cooling water, which refers to wastewater and waste liquid generated in the industrial production process, which contains industrial production materials, intermediate products, by-products and pollutants generated in the production process that are lost with water. Industrial wastewater is of various types and complex in composition, with high COD and nitrate nitrogen content. Since industrial wastewater often contains a variety of toxic substances, polluting the environment is very harmful to human health, so the discharge needs to be treated. In the sewage treatment process, biological treatment methods are widely used in sewage treatment plants across the country due to their advantages such as simple process, good treatment effect and obvious economic benefits. At present, the nitrate nitrogen concentration in the influent of the anaerobic device of sewage treatment needs to be controlled to avoid competition with anaerobic microorganisms and system shock. However, the traditional biological denitrification process has the disadvantages of large land occupation, high energy consumption, low denitrification efficiency and the need to add a large amount of organic carbon source in the treatment of high-concentration ammonia nitrogen wastewater and low C / N ratio wastewater.

[0003] Some manufacturers have improved the denitrification process. For example, the Chinese utility model patent with the authorization announcement number CN20585625U discloses a composite sewage treatment device. The modified process combines anaerobic MBR, aerobic MBR and nanofiltration processes to achieve efficient sewage treatment, but the operating cost is high and the operation process is complicated. Another example is the Chinese invention patent with the application publication number CN110902966A, which discloses an anaerobic membrane biological-short-range nitrification and denitrification wastewater treatment method and system. The wastewater treatment method includes subjecting the wastewater to be treated to an anaerobic reaction to obtain the first wastewater; filtering the first wastewater and subjecting it to a biological denitrification reaction to meet the standard, completing the wastewater treatment and achieving stable effluent water quality; the wastewater treatment equipment is concentrated, reducing the floor space, and convenient operation and management. However, the above technologies all use anaerobic and denitrification as two units, which still occupy a large area and have relatively high costs. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a water treatment agent that promotes anaerobic and denitrification at the same time, which promotes anaerobic systems to use anaerobic microorganisms as the dominant flora and simultaneously performs denitrification, so that anaerobic and denitrification are carried out in the same reactor, thereby reducing the floor space and lowering the treatment cost; and provide a sewage treatment system using the sewage treatment agent.

[0005] In order to achieve the first purpose, the present invention provides the following technical solutions:

[0006] A water treatment agent for promoting anaerobic and denitrification at the same time comprises a mixed liquid of ascorbic acid and glucose, wherein the mass ratio of ascorbic acid to glucose is 1:0.4-0.5.

[0007] Preferably, the preparation method comprises the following steps:

[0008] 1) Ascorbic acid and glucose are put into a ball mill according to a certain proportion and mixed evenly;

[0009] 2) Mix ascorbic acid and glucose mixed powder with clean water, add protective agent to the water sample, and control the pH to 3-4, wherein the mass ratio of ascorbic acid and glucose mixed powder to clean water is 1:7. Controlling the ratio of ascorbic acid and glucose mixed powder to clean water facilitates the adjustment of pH value, and the added protective agent protects ascorbic acid by controlling the pH value.

[0010] Preferably, the protective agent is hydrochloric acid. Organic acids have a small dissociation constant and are therefore not recommended, and inorganic acids should avoid sulfuric acid and nitric acid.

[0011] When the water treatment agent is used, 3 Add 1L of the water treatment agent to the influent of the anaerobic system, mix well and then let it enter the anaerobic system.

[0012] In the existing sewage treatment system, organic matter can be used as a carbon source by denitrifying bacteria, which forms a competitive relationship with methanogens. Generally, the denitrification process takes precedence over the methanogen process, so the activity of methanogens is inhibited and the methane content in the generated biogas is low.

[0013] The present invention can adjust the potential balance in the anaerobic reactor by adding the water treatment agent into the anaerobic system, so that the environment is more conducive to the survival of methanogens, thereby improving the activity of methanogens; denitrifying bacteria, as facultative bacteria, can still survive in the reactor, and the microorganisms in the reactor perform anaerobic and denitrifying reactions simultaneously.

[0014] In order to achieve the second purpose, the utility model provides the following technical solutions:

[0015] A sewage treatment system for simultaneous anaerobic and denitrification reactions, comprising an anaerobic reactor and a regulating tank arranged in front of the anaerobic reactor, the regulating tank being provided with a sewage inlet and a water treatment agent inlet, and the regulating tank being connected to the anaerobic reactor inlet, for mixing sewage and water treatment agents and then inputting them into the anaerobic reactor for anaerobic and denitrification reactions. The system promotes anaerobic and denitrification in the same reactor, reduces floor space and reduces treatment costs.

[0016] Preferably, the anaerobic reactor comprises an inner kettle, wherein a sample outlet pipe is provided at the upper middle part of the inner kettle and a sample inlet pipe is provided at the lower middle part, so that sewage flows out from the top and sludge settles in the inner kettle; and a control valve is provided on the sample outlet pipe, and a pump body is provided between the sample inlet pipe and the connection regulating tank, which is used to input the mixed liquid of sewage and water treatment agent into the inner kettle.

[0017] Preferably, a stirring mechanism is provided in both the inner kettle and the regulating tank. The stirring mechanism includes a stirring rod provided in the inner kettle and the regulating tank and a driving motor connected to the stirring rod. The driving motor drives the stirring rod to rotate to promote sufficient mixing of the materials in the inner kettle and the regulating tank.

[0018] Preferably, a sleeve is provided outside the inner kettle to form a condensate flow channel between the sleeve and the inner kettle, and a condensate inlet and a condensate outlet are provided on the sleeve, with water entering from the bottom and exiting from the top, thereby extending the contact time between the condensate and the outside of the inner kettle and achieving a better heat exchange effect.

[0019] Preferably, the anaerobic reactor also includes a monitoring component, which includes an OPR probe, a pH probe and a dissolved oxygen probe, and is used to detect the electrode potential value, pH value and temperature of the sewage in the inner kettle to determine the reaction conditions in the anaerobic reactor.

[0020] Preferably, it also includes a preparation device for preparing water treatment agents, which includes a ball mill and a dissolution tank. The ball mill is used to grind the water treatment agent raw materials into powder, and the dissolution tank is used to dissolve the water treatment agent raw material powder and add a protective agent.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention can adjust the potential balance in the anaerobic reactor by adding the water treatment agent into the anaerobic system, so that the environment is more conducive to the survival of methanogens, thereby improving the activity of methanogens and promoting the anaerobic system to use anaerobic microorganisms as the dominant flora, while denitrifying bacteria, as facultative bacteria, can still survive in the reactor and carry out denitrification at the same time, so that anaerobic and denitrification are carried out in the same reactor, reducing the occupied area and reducing the treatment cost; and provides a sewage treatment system using the sewage treatment agent.

[0023] It has been verified that the addition of ascorbic acid and glucose will effectively affect the nitrate nitrogen tolerance concentration of the anaerobic system; when the mass ratio of ascorbic acid to glucose is 1:1, the nitrate nitrogen concentration that the anaerobic system can tolerate is 200 mg / L, and when the mass ratio of ascorbic acid to glucose is 1:0.4-0.5, the nitrate nitrogen concentration that the anaerobic system can tolerate reaches 500-700 mg / L, which is conducive to the survival of methanogens and improves the activity of methanogens; the nitrate nitrogen concentration tolerated by the anaerobic system without adding this water treatment agent is less than 100 mg / L. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of a sewage treatment system that simultaneously performs anaerobic and denitrification reactions in Example 1.

[0025] Figure 2 This is a cross-sectional view of a sewage treatment system that simultaneously performs anaerobic and denitrification reactions in Example 1.

[0026] Figure 3 This is a cross-sectional view of the anaerobic reactor in the sewage treatment system of Example 2.

[0027] Figure 4 This is a flow chart of a sewage treatment system that simultaneously performs anaerobic and denitrification reactions in Example 3.

[0028] In the accompanying drawings: 10-anaerobic reactor, 11-inner kettle, 111-sample outlet pipe, 112-sample inlet pipe, 12-sleeve, 121-condensate inlet, 122-condensate outlet, 13-monitoring component, 20-regulating tank, 31-stirring rod, 32-driving motor, 40-preparation device, 41-ball mill, 42-dissolution tank. DETAILED DESCRIPTION

[0029] Example 1: A water treatment agent that promotes anaerobic and denitrification simultaneously, comprising a mixed solution of ascorbic acid and glucose, wherein the mass ratio of ascorbic acid to glucose is 1:0.4.

[0030] The preparation method comprises the following steps:

[0031] 1) Ascorbic acid and glucose are put into a ball mill according to a certain proportion and mixed evenly;

[0032] 2) Mix ascorbic acid and glucose mixed powder with clean water, add hydrochloric acid as a protective agent to the water sample, and control the pH to be 3-4, wherein the mass ratio of ascorbic acid and glucose mixed powder to clean water is 1:7.

[0033] When in use, at 1m 3 Add 1L of the water treatment agent to the influent of the anaerobic system, mix well and then let it enter the anaerobic system.

[0034] Using the HJ / T 346-2007 method for testing, the anaerobic system can tolerate a nitrate-nitrogen concentration of 532 mg / L.

[0035] Example 2: A water treatment agent that promotes anaerobic and denitrification simultaneously, comprising a mixed solution of ascorbic acid and glucose, wherein the mass ratio of ascorbic acid to glucose is 1:0.45.

[0036] The preparation method comprises the following steps:

[0037] 1) Ascorbic acid and glucose are put into a ball mill according to a certain proportion and mixed evenly;

[0038] 2) Mix ascorbic acid and glucose mixed powder with clean water, add hydrochloric acid as a protective agent to the water sample, and control the pH to be 3-4, wherein the mass ratio of ascorbic acid and glucose mixed powder to clean water is 1:7.

[0039] When in use, at 1m 3 Add 1L of the water treatment agent to the influent of the anaerobic system, mix well and then let it enter the anaerobic system.

[0040] Using the HJ / T 346-2007 method for testing, the anaerobic system can tolerate a nitrate-nitrogen concentration of 589 mg / L.

[0041] Example 3: A water treatment agent that promotes anaerobic and denitrification simultaneously, comprising a mixed solution of ascorbic acid and glucose, wherein the mass ratio of ascorbic acid to glucose is 1:0.5.

[0042] The preparation method comprises the following steps:

[0043] 1) Ascorbic acid and glucose are put into a ball mill according to a certain proportion and mixed evenly;

[0044] 2) Mix ascorbic acid and glucose mixed powder with clean water, add hydrochloric acid as a protective agent to the water sample, and control the pH to be 3-4, wherein the mass ratio of ascorbic acid and glucose mixed powder to clean water is 1:7.

[0045] When in use, at 1m 3 Add 1L of the water treatment agent to the influent of the anaerobic system, mix well and then let it enter the anaerobic system.

[0046] Using the HJ / T 346-2007 method for testing, the anaerobic system can tolerate a nitrate-nitrogen concentration of 684 mg / L.

[0047] Comparative Example 1: The only difference from Example 3 is that only ascorbic acid is used without adding glucose.

[0048] Using the HJ / T 346-2007 method for testing, the anaerobic system can tolerate a nitrate-nitrogen concentration of 130 mg / L.

[0049] Comparative Example 2: The only difference from Example 3 is that only glucose is used without adding ascorbic acid.

[0050] Using the HJ / T 346-2007 method for testing, the anaerobic system can tolerate a nitrate-nitrogen concentration of 105 mg / L.

[0051] Comparative Example 3: The only difference from Example 3 is that the mass ratio of ascorbic acid to glucose is 1:0.3.

[0052] Using the HJ / T 346-2007 method for testing, the anaerobic system can tolerate a nitrate-nitrogen concentration of 255 mg / L.

[0053] Comparative Example 4: The only difference from Example 3 is that the mass ratio of ascorbic acid to glucose is 1:1.

[0054] Using the HJ / T 346-2007 method for testing, the anaerobic system can tolerate a nitrate-nitrogen concentration of 200 mg / L.

[0055] Comparative Example 5: The only difference from Example 3 is that the water treatment agent is not added.

[0056] Using the HJ / T 346-2007 method for testing, the anaerobic system can tolerate a nitrate-nitrogen concentration of 98 mg / L.

[0057] The above-mentioned embodiments 1-3 and comparative examples 1-5 all adopt the same type of wastewater treatment system for simultaneous anaerobic and denitrification reactions, including an anaerobic reactor 10 and a regulating tank 20 arranged in front of the anaerobic reactor 10, the regulating tank 20 is provided with a sewage inlet and a water treatment agent inlet, and the regulating tank 20 is connected to the inlet of the anaerobic reactor 10 for transferring the wastewater per 1m 3 After the sewage and 1L of water treatment agent are mixed evenly, they are input into the anaerobic reactor 10 for anaerobic and denitrification reactions; the water treatment agents are the agents prepared in Examples 1-3 and Comparative Examples 1-5 respectively; the anaerobic reactor 10 includes an inner kettle 11, and a sample outlet pipe 111 is provided in the upper middle part of the inner kettle 11 and a sample inlet pipe 112 is provided in the lower middle part, so that the sludge is precipitated in the inner kettle 11, and the mixed liquid of the sewage and the water treatment agent enters from the bottom and repeatedly contacts with the sludge, thereby improving the utilization rate of the water treatment agent, and the treated sewage flows out from the top; and a control valve is provided on the sample outlet pipe 111, and a pump body 50 is provided between the sample inlet pipe 112 and the connection regulating tank 20, which is used to input the mixed liquid of the sewage and the water treatment agent into the inner kettle 11.

[0058] Both the inner kettle 11 and the regulating tank 20 are provided with a stirring mechanism, which includes a stirring rod 31 provided in the inner kettle 11 and the regulating tank 20 and a driving motor 32 connected to the stirring rod 31. The driving motor 32 drives the stirring rod 31 to rotate, thereby promoting sufficient mixing of the materials in the inner kettle 11 and the regulating tank 20.

[0059] A sleeve 12 is provided outside the inner kettle 11, and a condensate flow channel is formed between the sleeve 12 and the inner kettle 11, and a condensate inlet 121 and a condensate outlet 122 are provided on the sleeve 12. The height of the condensate inlet 121 is lower than the condensate outlet 122, and water enters from the bottom and exits from the top, which prolongs the contact time between the condensate and the outside of the inner kettle 11, and the heat exchange effect is better. The anaerobic reactor 10 also includes a monitoring component 13, which is an OPR probe, a pH probe, and a temperature probe, which are used to detect the electrode potential value, pH value, and temperature of the sewage in the inner kettle 11 to determine the reaction conditions in the anaerobic reactor 10.

[0060] The system also includes a preparation device 40 for preparing water treatment agents. The preparation device 40 includes a ball mill 41 and a dissolution tank 42. The ball mill 41 is used to grind the water treatment agent raw materials into powder, and the dissolution tank 42 is used to dissolve the water treatment agent raw material powder and add a protective agent.

Claims

1. A water treatment agent that promotes anaerobic and denitrification simultaneously, characterized in that: A mixed liquid comprising ascorbic acid and glucose, wherein the mass ratio of ascorbic acid to glucose is 1:0.4-0.5; The preparation method comprises the following steps: 1) Ascorbic acid and glucose are put into a ball mill according to the proportion and mixed evenly; 2) Mix the mixed powder of ascorbic acid and glucose with clean water, add a protective agent to the water sample, and control the pH to 3-4, wherein the mass ratio of the mixed powder of ascorbic acid and glucose to clean water is 1:

7.

2. A water treatment agent for promoting anaerobic and denitrification simultaneously according to claim 1, characterized in that: The protective agent is hydrochloric acid.

3. A water treatment agent for promoting anaerobic and denitrification simultaneously according to claim 2, characterized in that: When in use, at 1 m 3 Add 1 L of the water treatment agent to the influent of the anaerobic system, mix well and then let it enter the anaerobic system.

4. A sewage treatment system for simultaneous anaerobic and denitrification reactions, characterized in that: A sewage treatment system using the water treatment agent according to any one of claims 1 to 3 comprises an anaerobic reactor (10) and a regulating tank (20) arranged in front of the anaerobic reactor (10), the regulating tank (20) being provided with a sewage inlet and a water treatment agent inlet, and the regulating tank (20) being connected to the inlet of the anaerobic reactor (10) for mixing the sewage and the water treatment agent and then inputting them into the anaerobic reactor (10) for anaerobic and denitrification reactions.

5. A sewage treatment system for simultaneous anaerobic and denitrification reactions according to claim 4, characterized in that: The anaerobic reactor (10) comprises an inner kettle (11), wherein a sample outlet pipe (111) is provided at the upper middle portion of the inner kettle (11) and a sample inlet pipe (112) is provided at the lower middle portion thereof, so that sewage flows out from the upper portion and sludge settles in the inner kettle (11). A control valve is provided on the sample outlet pipe (111), and a pump body (50) is provided between the sample inlet pipe (112) and the connection regulating tank (20) for inputting a mixed solution of sewage and a water treatment agent into the inner kettle (11).

6. A sewage treatment system for simultaneous anaerobic and denitrification reactions according to claim 5, characterized in that: A sleeve (12) is provided outside the inner kettle (11), a condensate flow channel is formed between the sleeve (12) and the inner kettle (11), and a condensate inlet (121) and a condensate outlet (122) are provided on the sleeve (12).

7. A sewage treatment system for simultaneous anaerobic and denitrification reactions according to claim 4, characterized in that: A stirring mechanism is provided in both the inner kettle (11) and the regulating tank (20), and the stirring mechanism comprises a stirring rod (31) provided in the inner kettle (11) and the regulating tank (20) and a driving motor (32) connected to the stirring rod (31).

8. A sewage treatment system for simultaneous anaerobic and denitrification reactions according to claim 4, characterized in that: The anaerobic reactor (10) further comprises a monitoring component (13) for detecting the electrode potential value, pH value and temperature of the sewage in the inner kettle (11).

9. A sewage treatment system for simultaneous anaerobic and denitrification reactions according to any one of claims 5 to 8, characterized in that: It also includes a preparation device (40) for preparing a water treatment agent. The preparation device (40) includes a ball mill (41) and a dissolution tank (42). The ball mill (41) is used to grind the water treatment agent raw material into powder. The dissolution tank (42) is used to dissolve the water treatment agent raw material powder and add a protective agent.

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