Method suitable for rapid biofilm formation in ozone-biological activated carbon process

Abstract

The invention discloses a method suitable for rapid biofilm culturing in an ozone-biological activated carbon process, which comprises the following steps: adding biological activated carbon into a stainless steel cylindrical tube to prepare a carbon filter column, and cleaning the biological activated carbon in the carbon filter column by adopting gas-water combined backwashing; after the cleaned water body is subjected to stuffy aeration for 2 days, continuous flow water inflow is adopted, the inflow water is effluent of the ozone contact tank, meanwhile, a glucose solution is added, the concentration of glucose in the water body reaches 6-9 mg / L, and the backwashing period is 7-9 days; the CODMn and ammonia nitrogen indexes of the effluent of the carbon filter column are detected every day, the biofilm culturing time is shortened to 15 days by adjusting the filtering speed, and the removal rate of the CODMn and the ammonia nitrogen reaches 30% or above. According to the biological activated carbon biofilm culturing method, the biofilm culturing speed can be increased, rapid biofilm culturing is achieved, and the practical problem that biofilm culturing is difficult in a water plant is solved.

Description

Technical Field

[0001] The invention relates to the technical field of bioactive carbon biofilm formation, and in particular to a method for rapid biofilm formation in an ozone-bioactive carbon process. Background Art

[0002] With the continuous development of water treatment technology, ozone-bioactivated carbon process has been widely used. However, in practical applications, the biofilm effect of bioactivated carbon often becomes a key factor restricting its treatment efficiency. Traditional biofilm methods usually take a long time and have poor biofilm effects, resulting in COD Mn The removal efficiency is low and cannot meet the needs of water treatment.

[0003] Therefore, in order to solve the above problems, this paper proposes a method for rapid biofilm formation in the ozone-biological activated carbon process. Summary of the invention

[0004] The object of the present invention is to design a method capable of improving COD Mn , ammonia nitrogen removal rate, and a method for rapid biofilm formation suitable for ozone-biological activated carbon process.

[0005] In order to achieve the above technical effects, the present invention is implemented by the following technical scheme: a method suitable for rapid biofilm formation in an ozone-biological activated carbon process, characterized in that it comprises the following steps:

[0006] S1. A 2-meter-high biological activated carbon is evenly filled in a stainless steel cylindrical tube with a height of 5.1 meters and a diameter of 15 cm to prepare a carbon filter column;

[0007] S2, using air-water combined backwashing to clean the biologically activated carbon in the carbon filter column;

[0008] S3. The cleaned carbon filter column is subjected to a suffocation treatment for 1 to 2 days. During this period, the carbon filter column is ensured to be sealed to promote the growth of microorganisms and the formation of a film layer.

[0009] S4. After the exposure is completed, the carbon filter column is backwashed by continuously flowing water at multiple flow rates;

[0010] S5. During the backwashing process, a glucose solution with a concentration of 1 mg / L was added to the influent as a nutrient source, and the glucose addition time was 4 days;

[0011] S6. During continuous water inflow, the dissolved oxygen concentration in the water of the carbon filter column is controlled within the range of 6 to 9 mg / L by aeration;

[0012] S7. Detect the COD of the effluent from the carbon filter column every day Mn and ammonia nitrogen index; until and COD Mn, the removal rate of ammonia nitrogen reaches 30% or above.

[0013] Furthermore, in S2, the air-water combined backwashing specifically includes aerating the biological activated carbon first and then flushing it with water to ensure that there are no impurities and pollutants on the surface of the biological activated carbon.

[0014] Furthermore, in S3, the multi-stage flow rates are 3.2 m / h, 6.4 m / h and 9.6 m / h respectively.

[0015] Furthermore, in S3, the influent is the effluent from the ozone contact tank.

[0016] Furthermore, in S4, the backwashing is specifically: the backwashing intensity is 8 L / s·m every 7 to 9 days. 2 Continuous water inflow is used for a single water flush of 7 to 9 minutes.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention adopts a rapid biofilm formation method to shorten the biofilm formation time to 15 days. This increase in speed greatly improves the efficiency of biofilm formation in water plants;

[0019] 2. The present invention can ensure that the COD of the effluent from the carbon filter is Mn The removal rate of ammonia nitrogen reaches 30% or more, meeting stricter water quality standards;

[0020] 3. The method provided by the present invention can guide the actual production of water plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 is a flow chart of the method of the present invention;

[0023] Figure 2 The effect of different biofilm forming conditions on COD Mn Removal rate diagram;

[0024] Figure 3 This is a graph showing the removal rate of ammonia nitrogen under different biofilm formation conditions of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] A method for rapid biofilm formation in an ozone-biological activated carbon process, comprising the following steps:

[0028] Step 1: A 2-meter-high biological activated carbon is evenly filled into a stainless steel cylindrical tube with a height of 5.1 meters and a diameter of 15 cm to prepare a carbon filter column;

[0029] Step 2: Use air-water combined backwashing to clean the biological activated carbon, specifically: aerate the biological activated carbon first, then flush it with water to ensure that there are no impurities and pollutants on the surface of the biological activated carbon;

[0030] Step 3: The cleaned carbon filter column is subjected to a suffocation treatment for 2 days; during this period, the carbon filter column is ensured to be sealed to promote the growth of microorganisms and the formation of a film layer;

[0031] Step 4: After the exposure, the effluent from the ozone contact pool with a filtration rate of 6.4 m / h is introduced into the carbon filter column by continuous inflow. The carbon filter column is backwashed for 8 days. During backwashing, the flushing intensity of the inflow water is 8 L / s·m 2 , water flushing time 8min, cycle 2 times;

[0032] Step 5: During the backwashing process, glucose solution was added to the influent as a nutrient source to make the glucose concentration in the water reach 1 mg / L. The glucose addition time was 4 days.

[0033] Step 6: During continuous water inflow, the dissolved oxygen concentration in the water of the carbon filter column is controlled within the range of 6-9 mg / L by aeration;

[0034] Step 7: Detect the COD of the effluent from the carbon filter column in Example 1 every day Mn And ammonia nitrogen indicators, it can be seen that COD Mn The removal rate dropped significantly on the 7th and 8th days, which may be related to the blockage of particles on the surface or in the pores of activated carbon particles and the saturation of activated carbon adsorption; the removal rate recovered and stabilized between 50% and 66% in the late biofilm formation period (12-15 days), indicating that the biodegradation effect gradually dominated. At the same time, the removal effect of ammonia nitrogen was good, indicating that the activity of nitrifying bacteria in the system gradually increased.

[0035] Example 2

[0036] A method for rapid biofilm formation in an ozone-biological activated carbon process, comprising the following steps:

[0037] Step 1: A 2-meter-high biological activated carbon is evenly filled into a stainless steel cylindrical tube with a height of 5.1 meters and a diameter of 15 cm to prepare a carbon filter column;

[0038] Step 2: Use air-water combined backwashing to clean the biological activated carbon, specifically: aerate the biological activated carbon first, then flush it with water to ensure that there are no impurities and pollutants on the surface of the biological activated carbon;

[0039] Step 3: The cleaned carbon filter column is subjected to a suffocation treatment for 2 days; during this period, the carbon filter column is ensured to be sealed to promote the growth of microorganisms and the formation of a film layer;

[0040] Step 4: After the exposure, the effluent from the ozone contact pool with a filtration rate of 3.2 m / h is introduced into the carbon filter column by continuous inflow, and the carbon filter column is backwashed for 8 days; during backwashing, the flushing intensity of the inflow water is 8 L / s·m 2 , water flushing time 8min, cycle 2 times;

[0041] Step 5: During the backwashing process, glucose solution was added to the influent as a nutrient source to make the glucose concentration in the water reach 1 mg / L. The glucose addition time was 4 days.

[0042] Step 6: During continuous water inflow, the dissolved oxygen concentration in the water of the carbon filter column is controlled within the range of 6-9 mg / L by aeration;

[0043] Step 7: Detect the COD of the effluent from the carbon filter column in Example 2 every day Mn And ammonia nitrogen indicators, it can be seen that COD Mn The removal rate reached more than 30% on the 11th to 15th day. The low filtration rate in the early stage may have limited the metabolism of microorganisms, resulting in the shedding of biofilm. At the same time, ammonia nitrogen reached a maximum value of 75.2% on the 8th day, showing a strong removal ability for ammonia nitrogen. In the later period (12th to 15th day), the removal rate fluctuated between 60% and 70%, and nitrification was relatively continuous and stable.

[0044] Example 3

[0045] A method for rapid biofilm formation in an ozone-biological activated carbon process, comprising the following steps:

[0046] Step 1: A 2-meter-high biological activated carbon is evenly filled into a stainless steel cylindrical tube with a height of 5.1 meters and a diameter of 15 cm to prepare a carbon filter column;

[0047] Step 2: Use air-water combined backwashing to clean the biological activated carbon, specifically: aerate the biological activated carbon first, then flush it with water to ensure that there are no impurities and pollutants on the surface of the biological activated carbon;

[0048] Step 3: The cleaned carbon filter column is subjected to a suffocation treatment for 2 days; during this period, the carbon filter column is ensured to be sealed to promote the growth of microorganisms and the formation of a film layer;

[0049] Step 4: After the exposure, the effluent from the ozone contact pool with a filtration rate of 9.6 m / h is introduced into the carbon filter column by continuous inflow, and the carbon filter column is backwashed for 8 days; during backwashing, the flushing intensity of the inflow water is 8 L / s·m 2 , water flushing time 8min, cycle 2 times;

[0050] Step 5: During the backwashing process, glucose solution was added to the influent as a nutrient source to make the glucose concentration in the water reach 1 g / L. The glucose addition time was 4 days.

[0051] Step 6: During continuous water inflow, the dissolved oxygen concentration in the water of the carbon filter column is controlled within the range of 6-9 mg / L by aeration;

[0052] Step 7: Detect the COD of the effluent from the carbon filter column in Example 3 every day Mn And ammonia nitrogen indicators, it can be seen that COD Mn The removal rate was low in the early stage, indicating that a high filtration rate was not conducive to the stability of microorganisms in the early stage of biofilm formation. The full-cycle removal rate was low, stable between 20% and 40%, indicating that the contact time was insufficient under high filtration rate. At the same time, ammonia nitrogen reached a peak of 75.5% on the 7th day, but then dropped rapidly. It stabilized between 40% and 60% in the later stage, reflecting that high filtration rate may have an adverse effect on biofilm formation and stability.

[0053] In summary, the filtration rate of 6.4m / h (Example 1) and 3.2m / h (Example 2) has a better removal effect, indicating that a moderate water flow rate is conducive to biofilm formation and can provide sufficient contact time. High filtration rate (Example 3) will shorten the reaction time and reduce the removal effect. Comprehensive analysis shows that the operating conditions of Example 1 (filtration rate 6.4m / h, DO: 6-9mg / L, glucose concentration 1mg / L) are more conducive to COD Mn and removal of ammonia nitrogen.

Claims

1. A method for rapid biofilm formation in an ozone-biological activated carbon process, characterized in that: The following steps are involved: S1. A 2-meter-high biological activated carbon is evenly filled in a stainless steel cylindrical tube with a height of 5.1 meters and a diameter of 15 cm to prepare a carbon filter column; S2, using air-water combined backwashing to clean the biologically activated carbon in the carbon filter column; S3. The cleaned carbon filter column is subjected to a suffocating treatment for 1 to 2 seconds. During this period, the carbon filter column is ensured to be sealed; S4. After the exposure is completed, the carbon filter column is backwashed by continuously flowing water at multiple flow rates; S5. During the backwashing process, a glucose solution with a concentration of 1 mg / L was added to the influent as a nutrient source, and the glucose addition time was 4 days; S6. During continuous water inflow, the dissolved oxygen concentration in the water of the carbon filter column is controlled within the range of 6 to 9 mg / L by aeration; S7. Detect the COD of the effluent from the carbon filter column every day Mn and ammonia nitrogen indicators; by adjusting the filtration rate, the biofilm formation time was shortened to 15 days, and COD Mn , the removal rate of ammonia nitrogen reaches 30% or above.

2. A method for rapid biofilm formation in an ozone-biological activated carbon process according to claim 1, characterized in that: In S2, the air-water combined backwashing specifically involves first aerating the biological activated carbon and then flushing it with water.

3. A method for rapid biofilm formation in an ozone-biological activated carbon process according to claim 1, characterized in that: In S3, the multi-stage flow rates are 3.2 m / h, 6.4 m / h and 9.6 m / h respectively.

4. A method for rapid biofilm formation in an ozone-biological activated carbon process according to claim 1, characterized in that: In S3, the influent is the effluent from the ozone contact tank.

5. The method for rapid biofilm formation in an ozone-biological activated carbon process according to claim 1, characterized in that: In S4, the backwashing is specifically: the backwashing intensity is 8 L / s·m every 7 to 9 days. 2 Continuous water inflow is used for a single water rinse of 7 to 9 minutes.

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