Method for rapidly fluidizing carrier filler based on MBBR (Moving Bed Biofilm Reactor) process

Abstract

The invention discloses a method for rapidly fluidizing a carrier filler based on an MBBR (Moving Bed Biofilm Reactor) process, and solves the problems of low biofilm formation speed and long starting time caused by a non-fluidized state of the carrier filler. According to the technical scheme, the method comprises the following steps: S1, starting MBBR process sewage treatment equipment, and temporarily not introducing sewage; s2, adding a carrier filler into the reactor, and adding water; s3, quantitative inoculation sludge or aerobic bacteria agent is put into the reactor; s4, aeration is started, quantitative edible glucose, ammonium chloride and monopotassium phosphate are added after stuffy aeration is carried out for a set time, and water is supplemented to a set volume; s5, performing continuous stuffy aeration for 24 hours, wherein the carrier filler in the equipment is in a fluidized state; adding a certain amount of edible glucose, and continuing stuffy exposure for a set time; s6, adding quantitative edible glucose, ammonium chloride and monopotassium phosphate, continuing stuffy exposure, and maintaining the fluidized state of the carrier filler; and S7, when the carrier filler is in a fluidized operation state and domestic sewage is not filled, regularly supplementing quantitative carbon source, nitrogen and phosphorus to ensure that the carrier filler is in a continuous fluidized state.

Description

Technical Field

[0001] The invention belongs to the technical field of rural domestic sewage treatment, and in particular relates to a method for rapid fluidization of carrier fillers based on an MBBR process. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] As the living standards in rural areas improve, the amount of domestic sewage discharge increases, which has a serious impact on the ecological environment. Therefore, integrated rural domestic sewage treatment equipment is widely used. However, rural sewage has the characteristics of high nitrogen and phosphorus content in water quality and large fluctuations in drainage, which are difficult to adapt to traditional process equipment, so the MBBR process was introduced; the MBBR process combines the advantages of traditional fluidized bed and biological contact oxidation, uses lightweight porous fillers as carriers, can reduce investment, energy consumption and costs, adapt to fluctuations in water volume and quality, and has good stability and reliability. It has become a mainstream technology and is suitable for rural working conditions.

[0004] However, the problem with commonly used MBBR carrier fillers is that their density is close to that of sewage. When initially added, they are mostly suspended and accumulated above the liquid surface. The fluidization time is long, which can be up to 7-15 days or even longer, affecting the biofilm speed and equipment startup time. The existing related technology application numbers are CN201010179153.9, CN201910497550.1 and CN2202311523273.X, all of which involve methods for rapid biofilm formation with carrier fillers. The methods provided by the above three patents are biofilm formation methods studied for rapid biofilm formation and improved biofilm formation quality. They emphasize that biofilm formation still takes about 7 days, and lack methods for achieving fluidized operation of the "universal" carrier fillers in the equipment in a short initial period of time.

[0005] In summary, the problem that needs to be solved urgently is to design a low-cost, easy-to-operate method suitable for the operation and management of MBBR process rural domestic sewage treatment equipment, so that the carrier filler in the equipment can avoid accumulation and overflow when it is put into use in the early stage, and achieve rapid fluidization, laying the foundation for stable biofilm formation and efficient startup of subsequent equipment. Summary of the invention

[0006] In view of the above problems, the present invention provides a method for rapid fluidization of carrier fillers based on the MBBR process, which solves the problem that during the initial startup and operation stage of the MBBR process rural domestic sewage treatment equipment, all the carrier fillers in the equipment are suspended and accumulated above the liquid surface, and the non-fluidized state of the carrier fillers leads to low biofilm formation speed and efficiency and long startup time.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] The present invention provides a method for rapid fluidization of a carrier filler based on an MBBR process, comprising the following steps:

[0009] S1. The MBBR process sewage treatment equipment is initially started and sewage is not connected for the time being;

[0010] S2. Adding a carrier filler and water to the reactor;

[0011] S3. Adding a certain amount of inoculated sludge to the reactor, or adding a certain amount of aerobic bacteria to the reactor;

[0012] S4. Turn on aeration, and after the set time of aeration, add the set weight of edible glucose, ammonium chloride and potassium dihydrogen phosphate, and add water to the set volume;

[0013] S5. Continuously ventilate for a set time, the carrier filler in the equipment is in a fluidized operation state, and rapid fluidization is achieved; after adding a certain amount of edible glucose, continue to ventilate for a set time;

[0014] S6. After the exposure, the carrier filler in the reactor is kept in a fluidized state, and then a certain amount of edible glucose, ammonium chloride and potassium dihydrogen phosphate are added, and the exposure is continued to keep the carrier filler in a fluidized state;

[0015] S7. After the carrier filler is in a fluidized operation state, when no domestic sewage is added, it is necessary to regularly supplement a certain amount of carbon source, nitrogen and phosphorus to maintain the continuous fluidized movement of the carrier filler.

[0016] Preferably, the filling rate of the carrier filler in S2 is 30%-35%.

[0017] Preferably, the concentration of the inoculum sludge in S2 is 7800 mg / L, and the sludge concentration in the reactor after adding the inoculum sludge is 800 mg / L.

[0018] Preferably, when aeration is turned on in S4, the initial COD, ammonia nitrogen and total phosphorus concentrations in the reactor are controlled at 400 mg / L, 40 mg / L and 5 mg / L, respectively.

[0019] Preferably, the continuous aeration time in S5 is 24 hours, and the air-water ratio of aeration in the reactor is controlled to be not less than 200:1; when the water temperature is 28°C-32°C in summer, the DO in the water is maintained at 4-6 mg / L; when the water temperature is 10°C-14°C in winter, the DO in the water is maintained at 6-8 mg / L.

[0020] Preferably, after continuous aeration for a set period of time in S5, the COD concentration in the supernatant in the equipment is 190-230 mg / L, the ammonia nitrogen concentration is 22-35 mg / L, and the total phosphorus concentration is 2.5-4.2 mg / L.

[0021] Preferably, after adding edible glucose again in S5, the exposure is continued for a set time.

[0022] Preferably, after exposure in S6, the COD concentration in the supernatant in the reactor is 200-250 mg / L, the ammonia nitrogen concentration is 20-29 mg / L, and the total phosphorus concentration is 2.5-2.8 mg / L.

[0023] Preferably, the aerobic bacterial agent added in S3 is a dry powder aerobic bacterial agent.

[0024] Preferably, the concentration of the aerobic bacterial agent in the reactor is not less than 8 g / L, and the content of live bacteria in the aerobic bacterial agent is not less than 20 billion / gram.

[0025] Compared with the prior art, the present invention has the following advantages and positive effects:

[0026] The present invention can realize the rapid fluidization operation state of the carrier filler in the aerobic zone of the MBBR process rural domestic sewage treatment equipment. It only needs to add a small amount of inoculated sludge or aerobic bacteria agent in the aerobic zone, supplemented by a small amount of nutrients such as glucose, ammonium chloride and potassium dihydrogen phosphate, and perform suffocation. The required power is small, the cost is low, and the operation is simple and feasible. It only takes 24 hours of suffocation to realize the fluidization operation state of the carrier filler, which takes very little time. This lays a good foundation for the stable biofilm formation and efficient startup operation of the equipment.

[0027] The present invention can be widely applied to the startup stage of MBBR process sewage treatment equipment, and can realize the rapid fluidization of mobile carrier fillers. The carrier fillers are in full contact with the liquid phase in this running state, ensuring the subsequent biofilm efficiency. In addition, the method has low cost, simple and feasible operation, and is particularly suitable for the actual needs of the industry of rural domestic sewage treatment, and has considerable social benefits and promotion value. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0030] Example 1

[0031] In summer, when the water temperature is 28℃-32℃, 12L is added to a 50L reactor, the filler filling rate is 30%, the carrier filler is filled and water is added to 35L, 4.1L of inoculated sludge with a concentration of 7800mg / L is added to the reactor, equivalent to a sludge concentration of 800mg / L, aeration is turned on, and after 3 hours of aeration, 13.6g of edible glucose, 5.6g of ammonium chloride and 0.88g of potassium dihydrogen phosphate are added, and water is added to 40L (the initial COD, ammonia nitrogen and total phosphorus concentrations in the reactor are about 400mg / L, 40mg / L and 5mg / L respectively, and the initial COD is the chemical oxygen demand), and the aeration is continued for 24 hours, and the air-water ratio of aeration in the reactor is controlled to be not less than 200:1, and the DO (dissolved oxygen) in the water is maintained at 4-6mg / L.

[0032] After 24 hours: the carrier filler in the reactor was in a fluidized operation state; the concentrations of COD, ammonia nitrogen and total phosphorus in the supernatant in the reactor were 220 mg / L, 30 mg / L and 4 mg / L respectively; after adding 6.8 g of edible glucose, the exposure was continued for 24 hours.

[0033] After 48 hours of operation, the carrier filler in the reactor maintained a fluidized operation state; the concentrations of COD, ammonia nitrogen and total phosphorus in the supernatant in the reactor were 220 mg / L, 23 mg / L and 2.8 mg / L respectively. After adding 6.8 g of edible glucose, 2.8 g of ammonium chloride and 0.44 g of potassium dihydrogen phosphate, the exposure was continued.

[0034] According to the method of Example 1 above, under the condition of summer water temperature of about 30°C, the inoculated quantitative sludge can realize the carrier filler in a state of rapid fluidization movement for 24 hours. In practical applications, domestic sewage can be continuously added thereafter for startup operation. After the carrier filler is in a fluidized operation state, when domestic sewage is not added, it is necessary to supplement a quantitative carbon source every 24 hours, and a quantitative nitrogen and phosphorus every 48 hours to maintain the continuous fluidization movement of the carrier filler.

[0035] Example 2

[0036] In summer, when the water temperature is 28℃-32℃, add 12L to a 50L reactor with a filler filling rate of 30%. Add water to the carrier filler to 35L, add 320g of aerobic bacteria to the reactor, equivalent to 8g / L of aerobic bacteria, turn on aeration, and after 3 hours of aeration, add 13.6g of edible glucose, 5.6g of ammonium chloride and 0.88g of potassium dihydrogen phosphate, and add water to 40L. The initial COD, ammonia nitrogen and total phosphorus concentrations in the reactor are about 400mg / L, 40mg / L and 5mg / L, respectively. Aeration is continued for 24 hours to control the gas-water ratio of aeration in the reactor to be no less than 200:1, and the DO in the water is maintained at 4-6mg / L.

[0037] After 24 hours: the carrier filler in the reactor was in a fluidized operation state; the concentrations of COD, ammonia nitrogen and total phosphorus in the supernatant in the reactor were 190 mg / L, 22 mg / L and 3 mg / L respectively; after adding 6.8 g of edible glucose, the exposure was continued for 24 hours.

[0038] After 48 hours of operation, the carrier filler in the reactor maintained a fluidized operation state; the concentrations of COD, ammonia nitrogen and total phosphorus in the supernatant in the reactor were 200 mg / L, 20 mg / L and 2.5 mg / L respectively. After adding 6.8 g of edible glucose, 2.8 g of ammonium chloride and 0.44 g of potassium dihydrogen phosphate, the exposure was continued.

[0039] According to the method of Example 2 above, under the condition of summer water temperature of about 30°C, adding a quantitative aerobic bacterial agent can achieve a 24-hour rapid fluidization movement state for the carrier filler. In practical applications, domestic sewage can be continuously added thereafter for startup operation. After the carrier is in a fluidized operation state, when domestic sewage is not added, it is necessary to supplement a quantitative carbon source every 24 hours, and a quantitative nitrogen and phosphorus every 48 hours to maintain the continuous fluidization movement of the carrier filler.

[0040] The aerobic bacterial agent is composed of nitrifying bacteria, calcoacetic acid acinetobacter, spore bacillus, high-efficiency flocculant bacteria, yeast, micrococcus, enzyme and nutrient, and the content of live bacteria is not less than 20 billion / gram. The nitrifying bacteria, calcoacetic acid acinetobacter, spore bacillus, high-efficiency flocculant bacteria, yeast, micrococcus, enzyme and nutrient are all existing materials.

[0041] Example 3

[0042] Under the condition of 10℃-14℃ water temperature in winter, add 12L to a 50L reactor with a filler filling rate of 30%. Add water to the carrier filler to 35L, add 320g of aerobic bacteria to the reactor, equivalent to 8g / L of aerobic bacteria, turn on aeration, and after 3 hours of aeration, add 13.6g of edible glucose, 5.6g of ammonium chloride and 0.88g of potassium dihydrogen phosphate, and add water to 40L (the initial COD, ammonia nitrogen and total phosphorus concentrations in the reactor are about 400mg / L, 40mg / L and 5mg / L respectively), aerate continuously for 24 hours, control the gas-water ratio of aeration in the reactor to be not less than 200:1, and maintain DO in the water at 6-8mg / L.

[0043] After 24 hours: the carrier filler in the reactor was in a fluidized operation state; the concentrations of COD, ammonia nitrogen and total phosphorus in the supernatant in the reactor were 230 mg / L, 35 mg / L and 4 mg / L respectively; after adding 6.8 g of edible glucose, the exposure was continued for 24 hours.

[0044] After 48 hours of operation, the carrier filler in the reactor maintained a fluidized operation state; the concentrations of COD, ammonia nitrogen and total phosphorus in the supernatant in the reactor were 250 mg / L, 29 mg / L and 2.5 mg / L respectively. After adding 6.8 g of edible glucose, 2.8 g of ammonium chloride and 0.44 g of potassium dihydrogen phosphate, the exposure was continued.

[0045] According to the method of Example 3 above, under the condition of winter water temperature of about 12°C, adding a quantitative aerobic bacterial agent can achieve a 24-hour rapid fluidization movement state for the carrier filler. In practical applications, domestic sewage can be continuously added thereafter for startup operation. After the carrier filler is in a fluidized operation state, when domestic sewage is not added, it is necessary to supplement a quantitative carbon source every 24 hours, and a quantitative nitrogen and phosphorus every 48 hours to maintain the continuous fluidization movement of the carrier filler.

[0046] Example 4

[0047] Under the condition of 10℃-14℃ water temperature in winter, 0.84m3 is added to the 2.8m3 cylindrical horizontal tank equipment, the filling rate of the filler is 30%, the carrier filler is filled with water to the effective water level line, 22.40kg of aerobic bacteria agent is added to the equipment, equivalent to 8g / L of aerobic bacteria agent, and aeration is turned on. After 3 hours of aeration, 952g of edible glucose, 392g of ammonium chloride and 61.6g of potassium dihydrogen phosphate are added (the initial COD, ammonia nitrogen and total phosphorus concentrations in the equipment are about 400mg / L, 40mg / L and 5mg / L respectively), and aeration is continued for 24 hours to control the air-water ratio of aeration in the equipment to be not less than 200:1, and the DO in the water is maintained at 6-8mg / L.

[0048] After 24 hours: the carrier filler in the equipment was in a fluidized operation state; the concentrations of COD, ammonia nitrogen and total phosphorus in the supernatant in the equipment were 220mg / L, 33mg / L and 4.2mg / L respectively; after adding 476g of edible glucose, the equipment was exposed for another 24 hours.

[0049] After 48 hours of operation, the carrier filler in the equipment maintained a fluidized operation state; the concentrations of COD, ammonia nitrogen and total phosphorus in the supernatant in the equipment were 240 mg / L, 26 mg / L and 2.6 mg / L respectively. After adding 476g of edible glucose, 196g of ammonium chloride and 30.8g of potassium dihydrogen phosphate, the equipment continued to be exposed.

[0050] According to the method of Example 4 above, under the condition of winter water temperature of about 12°C, adding a quantitative aerobic bacterial agent can realize the rapid fluidization movement of the carrier filler in the sewage treatment equipment for 24 hours. In practical applications, domestic sewage can be continuously added thereafter for startup operation. After the carrier filler is in a fluidized operation state, when domestic sewage is not added, it is necessary to supplement a quantitative carbon source every 24 hours, and a quantitative nitrogen and phosphorus every 48 hours, so as to maintain the continuous fluidization movement of the carrier filler.

[0051] Although the above describes the specific implementation methods of the present invention, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A method for rapid fluidization of carrier fillers based on MBBR process, characterized in that: The following steps are involved: S1. The MBBR process sewage treatment equipment is initially started and sewage is not connected for the time being; S2. Adding a carrier filler and water to the reactor; S3. Adding a certain amount of inoculated sludge to the reactor, or adding a certain amount of aerobic bacteria to the reactor; S4. Turn on aeration, and after the set time of aeration, add the set weight of edible glucose, ammonium chloride and potassium dihydrogen phosphate, and add water to the set volume; S5. Continuously ventilate for a set time, the carrier filler in the equipment is in a fluidized operation state, and rapid fluidization is achieved; after adding a certain amount of edible glucose, continue to ventilate for a set time; S6. After the exposure, the carrier filler in the reactor is kept in a fluidized state, and then a certain amount of edible glucose, ammonium chloride and potassium dihydrogen phosphate are added, and the exposure is continued to keep the carrier filler in a fluidized state; S7. After the carrier filler is in a fluidized operation state, when no domestic sewage is added, it is necessary to regularly supplement a certain amount of carbon source, nitrogen and phosphorus to maintain the continuous fluidized movement of the carrier filler.

2. A method for rapid fluidization of carrier fillers based on MBBR process according to claim 1, characterized in that: The filling rate of the carrier filler in S2 is 30%-35%.

3. A method for rapid fluidization of carrier fillers based on MBBR process according to claim 1, characterized in that: The concentration of the inoculum sludge in S2 was 7800 mg / L, and the sludge concentration in the reactor was 800 mg / L after the inoculum sludge was added.

4. A method for rapid fluidization of carrier fillers based on MBBR process according to claim 1, characterized in that: When aeration was turned on in S4, the initial COD, ammonia nitrogen and total phosphorus concentrations in the reactor were controlled at 400 mg / L, 40 mg / L and 5 mg / L, respectively.

5. A method for rapid fluidization of carrier fillers based on MBBR process according to claim 1, characterized in that: In S5, the continuous aeration time is 24 hours, and the air-water ratio of aeration in the reactor is controlled to be no less than 200:1; when the water temperature is 28℃-32℃ in summer, the DO in the water is maintained at 4-6mg / L; when the water temperature is 10℃-14℃ in winter, the DO in the water is maintained at 6-8mg / L.

6. A method for rapid fluidization of carrier fillers based on MBBR process according to claim 1, characterized in that: After continuous aeration for a set period of time in S5, the COD concentration in the supernatant in the equipment is 190-230 mg / L, the ammonia nitrogen concentration is 22-35 mg / L, and the total phosphorus concentration is 2.5-4.2 mg / L.

7. A method for rapid fluidization of carrier fillers based on MBBR process according to claim 1, characterized in that: After adding edible glucose again in S5, continue to air-dry for the set time.

8. A method for rapid fluidization of carrier fillers based on MBBR process according to claim 1, characterized in that: After exposure in S6, the COD concentration in the supernatant in the reactor was 200-250 mg / L, the ammonia nitrogen concentration was 20-29 mg / L, and the total phosphorus concentration was 2.5-2.8 mg / L.

9. A method for rapid fluidization of carrier fillers based on MBBR process according to claim 1, characterized in that: The aerobic bacterial agent added in S3 is a dry powder aerobic bacterial agent.

10. A method for rapid fluidization of carrier fillers based on MBBR process according to claim 9, characterized in that: The concentration of the aerobic bacterial agent in the reactor is not less than 8 g / L, and the content of live bacteria in the aerobic bacterial agent is not less than 20 billion / g.