CN109179657B - Secondary fluidized bed domestic sewage treatment method and device - Google Patents

Secondary fluidized bed domestic sewage treatment method and device Download PDF

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CN109179657B
CN109179657B CN201811153329.6A CN201811153329A CN109179657B CN 109179657 B CN109179657 B CN 109179657B CN 201811153329 A CN201811153329 A CN 201811153329A CN 109179657 B CN109179657 B CN 109179657B
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CN109179657A (en
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章文军
王曼婷
赵静静
李方相
张子超
王浩
王芳
刘扬
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Chengtong Kaisheng Ecological Construction Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/308Biological phosphorus removal
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/32Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • C02F3/322Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/34Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/105Phosphorus compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia

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Abstract

The invention discloses a secondary fluidized bed domestic sewage treatment method and a device, wherein no chemical reagent is added, and the problem of secondary pollution is avoided.

Description

Secondary fluidized bed domestic sewage treatment method and device
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a domestic sewage treatment method and device of a secondary fluidized bed.
Background
With the continuous development of human society, the population is continuously increased, the urban scale is continuously enlarged, the water consumption of cities is continuously increased, the shortage of water and the difficulty of sewage treatment are aggravated, the environmental problems are increasingly prominent, and the water crisis caused by the water consumption becomes an important restriction factor for the development of social economy.
The existing domestic sewage treatment technology has the problems of high investment cost, complex technology, high management difficulty and the like, and has defects in treatment effect and is difficult to reach the discharge standard. For domestic sewage treatment, a biological sewage treatment process with simple operation and management, high treatment efficiency, low energy consumption and low excess sludge yield is sought, and the problem to be solved in the technical field of domestic sewage treatment is urgent at present.
Disclosure of Invention
Based on the method, the invention provides a method and a device for treating domestic sewage by a two-stage fluidized bed.
The technical scheme adopted by the invention is as follows:
a secondary fluidized bed domestic sewage treatment device comprises a regulating tank, an anaerobic tank, an MBBR-1 tank and an MBBR-2 tank which are connected in sequence through pipelines;
the adjusting tank is provided with a fiber ball and a submersible pump, and the submersible pump is used for connecting the treated sewage into the anaerobic tank; the anaerobic tank is provided with carbon fibers; the MBBR-1 tank is provided with immobilized microorganism gel and an aeration disc A; the microorganisms in the immobilized microorganism gel are nitrifying bacteria and bacillus.
The MBBR-2 pool is provided with immobilized microalgae gel, an aeration disc B and a diving LED lamp.
A secondary fluidized bed domestic sewage treatment method comprises the following steps:
A. domestic sewage enters the regulating tank through a pipeline, and the sewage treated by the regulating tank is pumped into the anaerobic tank through the submersible pump to react; wherein the retention time of the sewage in the regulating tank is 0.5-4 h;
B. then the sewage enters an MBBR-1 pool, ammonia nitrogen is converted into nitric acid nitrogen through immobilized microorganism gel, and organic matters are decomposed to obtain sewage treated by the MBBR-1 pool;
C. then the sewage treated by the MBBR-1 pool is connected into an MBBR-2 pool, the MBBR-2 pool is provided with immobilized microalgae gel, and the algae in the gel rapidly grow and breed under the irradiation of an aeration disc for supplying oxygen and a diving LED lamp to fully absorb nitric acid nitrogen and active phosphorus in the water body;
D. and discharging the sewage treated by the MBBR-2 tank through an outlet.
Preferably, the retention time of the sewage in the MBBR-1 pool is 3-6 h.
Preferably, the retention time of the sewage in the MBBR-2 pool is 1.5-2 h.
Preferably, the MBBR-2 pool is illuminated by a diving LED lamp, and the illumination intensity is 3000 LX.
Preferably, the concentration of the nitrifying bacteria in the MBBR-1 pool is 108~109cfu/mL, concentration of Bacillus 109~1010cfu/mL。
Preferably, the microalgae are chlorella and scenedesmus.
More preferably, the concentration of Chlorella in the MBBR-2 pool is 103~105Perilla frutescens/mL, scenedesmus concentration of 104~105one/mL.
Preferably, a water temperature regulator is respectively arranged in the MBBR-1 pool and the MBBR-2 pool, the water temperature in the MBBR-1 pool is regulated to be 40-45 ℃ every 5-6 hours, the water temperature is kept for 1 hour, and the water temperature is not controlled in the rest time; adjusting the water temperature of 35-38 ℃ every 10-12 h in the MBBR-2 pool, keeping the water temperature for 2-3 h, and not controlling the water temperature in the rest time; the LED lights are turned off during the maintenance of the water temperature.
In the scheme of the invention, three chemical reactions are carried out in the anaerobic tank, firstly, COD is hydrolyzed and acidified, meanwhile, organic nitrogen is hydrolyzed and acidified into ammonia nitrogen, and phosphorus in various forms is changed into active phosphorus through the decomposition effect of microorganisms.
Microorganisms in the MBBR-1 tank are nitrifying bacteria and bacillus, the nitrifying bacteria further carry out nitration reaction on ammonia nitrogen generated by the anaerobic tank to generate nitric acid nitrogen, and the bacillus continuously decomposes COD. Phosphorus accumulating bacteria are not added in the process unit, so that phosphorus elements are not removed, and the phosphorus elements continuously exist in an active phosphorus form, which is different from an O-grade process of a conventional sewage treatment plant.
The gel microalgae in the MBBR-2 pool are grown and propagated by themselves under proper conditions by taking nitric acid nitrogen and active phosphorus generated in the MBBR-1 pool as nutrients. The high-concentration gel microalgae is periodically salvaged and recovered, and the low-concentration gel microalgae is timely added, so that the normal operation of the device is ensured. Finally, the algae consume pollutants in the water to achieve the effect of purifying the water body. Meanwhile, the salvaged high-concentration gel microalgae can be used for feeding fishes, and resource utilization of N, P nutrient elements is fully realized.
Compared with the prior art, the invention has the beneficial effects that:
(1) the whole process does not add chemical agents, and uses pure biological methods such as microorganisms, algae and the like which utilize the action of life metabolic activity to purify water quality.
(2) The first three process units (the regulating tank, the anaerobic tank and the MBBR-1 tank) convert nitrogen and phosphorus elements into nitric acid nitrogen and active phosphorus which are easily absorbed and utilized by gel microalgae (chlorella and scenedesmus) in the MBBR-2 tank, and finally remove pollutants in the system through metabolic activity of algae, so that the water quality is purified.
(3) The device has simple structure, can be arranged in an overground type, a buried type and a semi-overground type, is flexible to arrange, has low capital construction cost and maintenance cost, and is a novel environment-friendly integrated domestic sewage treatment device.
(4) Conventional fluidized bed processes require periodic cleaning of the activated sludge to remove elemental phosphorus. The process ensures that nitrogen and phosphorus elements are absorbed and utilized by the algae, sludge is rarely required to be cleaned, and the process has high treatment efficiency and low energy consumption.
(5) The domestic sewage treatment method has a good domestic sewage treatment effect, wherein the removal rate of COD is 83.6-94.3%, the removal rate of BOD5 is 79.8-92.9%, the removal rate of suspended matters is 80.1-91.6%, the removal rate of TN is 78.7-97.8%, and the removal rate of ammonia nitrogen is 94.5-99.2%; the TP removal rate is 88.5-95.2%.
Drawings
FIG. 1 is a schematic view of a two-stage fluidized bed domestic sewage treatment apparatus according to embodiments 1 to 5 of the present invention.
In the figure, 1: retaining walls; 2: a submersible pump; 3: fiber balls; 4: a carbon fiber; 5: an aeration disc A; 6: an aeration disc B; 7: a submersible LED lamp; 8: immobilizing a microbial gel; 9: immobilized microalgae gel 9; 10: a water pipe; 11: a regulating tank; 12: an anaerobic tank; 13: an MBBR-1 pool; 14: an MBBR-2 pool; 15: a sewage inlet; 16: and a water outlet.
FIG. 2 shows two-stage fluidized bed domestic sewage treatment apparatuses according to embodiments 6 to 7 of the present invention, in which 17 and 18 each represent a water temperature regulator.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
The experimental methods used in the examples of the present invention are all conventional methods unless otherwise specified.
The materials, reagents and the like used in the examples of the present invention can be obtained commercially without specific description.
Example 1
A secondary fluidized bed domestic sewage treatment device comprises a regulating tank 11, an anaerobic tank 12, an MBBR-1 tank 13 and an MBBR-2 tank 14 which are connected through pipelines;
the adjusting tank 11 is provided with a fiber ball 3 and a submersible pump 2, and the submersible pump 2 is used for connecting the treated sewage into an anaerobic tank 12; the anaerobic tank 12 is provided with carbon fibers 4; the MBBR-1 tank 13 is provided with an immobilized microorganism gel 8 and an aeration disc A5; the microorganisms are nitrobacteria and bacillus, and the MBBR-2 tank 14 is provided with immobilized microalgae gel 9, an aeration disc B6 and a diving LED lamp 7.
A secondary fluidized bed domestic sewage treatment method comprises the following steps:
A. domestic sewage enters the regulating tank 11 through a pipeline, and the sewage treated by the regulating tank 11 is pumped into the anaerobic tank 12 through the submersible pump 2 to react; wherein the retention time of the sewage in the regulating tank 11 is 0.5 h;
B. then the sewage enters an MBBR-1 pool 13, ammonia nitrogen is converted into nitric acid nitrogen through immobilized microorganism gel 8, and organic matters are decomposed to obtain the sewage treated by the MBBR-1 pool 13; the retention time of the sewage in the MBBR-1 tank 13 is 2 h;
C. then the sewage treated by the MBBR-1 pool 13 is accessed into an MBBR-2 pool 14, the MBBR-2 pool 14 is provided with immobilized microalgae gel 9, and under the irradiation of an aeration disc for supplying oxygen and a diving LED lamp 7 (the illumination intensity of the MBBR-2 pool 14 under the irradiation of the diving LED lamp 7 is 2000LX), the algae in the gel rapidly grow and breed, and the nitric acid nitrogen and the active phosphorus in the water body are fully absorbed; the retention time of the sewage in the MBBR-2 pool 14 is 1 h;
D. the sewage treated by the MBBR-2 tank 14 is discharged through an outlet.
The concentration of nitrifying bacteria in the MBBR-1 pool 13 is 107cfu/mL, concentration of Bacillus 108cfu/mL。
The microalgae is Chlorella, and the concentration of Chlorella in MBBR-2 pool 14 is 103one/mL.
Example 2
A two-stage fluidized bed domestic sewage treatment device, which is the same as the embodiment 1.
A secondary fluidized bed domestic sewage treatment method comprises the following steps:
A. domestic sewage enters the regulating tank 11 through a pipeline, and the sewage treated by the regulating tank 11 is pumped into the anaerobic tank 12 through the submersible pump 2 to react; wherein the retention time of the sewage in the regulating tank 11 is 4 h;
B. then the sewage enters an MBBR-1 pool 13, ammonia nitrogen is converted into nitric acid nitrogen through immobilized microorganism gel 8, and organic matters are decomposed to obtain the sewage treated by the MBBR-1 pool 13; the retention time of the sewage in the MBBR-1 tank 13 is 3 h.
C. Then the sewage treated by the MBBR-1 pool 13 is connected into an MBBR-2 pool 14, the MBBR-2 pool 14 is provided with immobilized microalgae gel 9, and under the irradiation of an aeration disc for supplying oxygen and a diving LED lamp 7 (the illumination intensity of the MBBR-2 pool 14 is 2000LX), the algae in the gel rapidly grow and propagate to fully absorb the nitric acid nitrogen and the active phosphorus in the water body; the retention time of the sewage in the MBBR-2 pool 14 is 1.5 h;
D. the sewage treated by the MBBR-2 tank 14 is discharged through an outlet.
The concentration of nitrifying bacteria in the MBBR-1 pool 13 is 108cfu/mL, concentration of Bacillus 109cfu/mL。
The microalgae is Chlorella, and the concentration of Chlorella in MBBR-2 pool 14 is 103one/mL.
Example 3
A two-stage fluidized bed domestic sewage treatment device, which is the same as the embodiment 1.
A secondary fluidized bed domestic sewage treatment method comprises the following steps:
A. domestic sewage enters the regulating tank 11 through a pipeline, and the sewage treated by the regulating tank 11 is pumped into the anaerobic tank 12 through the submersible pump 2 to react; wherein the retention time of the sewage in the regulating tank 11 is 2 hours;
B. then the sewage enters an MBBR-1 pool 13, ammonia nitrogen is converted into nitric acid nitrogen through immobilized microorganism gel 8, and organic matters are decomposed to obtain the sewage treated by the MBBR-1 pool 13; the retention time of the sewage in the MBBR-1 tank 13 is 6 h;
C. then the sewage treated by the MBBR-1 pool 13 is connected into an MBBR-2 pool 14, the MBBR-2 pool 14 is provided with immobilized microalgae gel 9, and under the irradiation of an aeration disc for supplying oxygen and a diving LED lamp 7 (the illumination intensity of the MBBR-2 pool 14 is 2000LX), the algae in the gel rapidly grow and propagate to fully absorb the nitric acid nitrogen and the active phosphorus in the water body; the retention time of the sewage in the MBBR-2 pool 14 is 2 h;
D. the sewage treated by the MBBR-2 tank 14 is discharged through an outlet.
The concentration of nitrifying bacteria in the MBBR-1 pool 13 is 109cfu/mL, concentration of Bacillus 1010cfu/mL;
The microalgae is scenedesmus; the concentration of Scenedesmus in the MBBR-2 pool 14 is 105one/mL.
Example 4
A secondary fluidized bed domestic sewage treatment device, which is the same as the embodiment 1;
a two-stage fluidized bed domestic sewage treatment method, which is different from the embodiment 3 in that,
the MBBR-2 pool 14 is illuminated under the dive LED lamp 7 at 3000 LX.
Example 5
A secondary fluidized bed domestic sewage treatment device, which is the same as the embodiment 1;
a two-stage fluidized bed domestic sewage treatment method, which is different from the embodiment 4 in that,
the microalgae is Chlorella and Scenedesmus, and the concentration of Chlorella in MBBR-2 pool 14 is 105Perilla frutescens/mL, scenedesmus concentration of 104one/mL.
Example 6
A two-stage fluidized bed domestic sewage treatment device is different from the device in the embodiment 1 in that a water temperature regulator 17 is arranged in an MBBR-1 tank 13, and a water temperature regulator 18 is arranged in an MBBR-2 tank 14, and the structure of the device is shown in figure 2.
A two-stage fluidized bed domestic sewage treatment method, which is different from the embodiment 5 in that,
the water temperature in the MBBR-1 pool 13 is adjusted to 40 ℃ every 5 hours and kept for 1 hour, and the water temperature is not controlled in the rest time; the water temperature in the MBBR-2 pool 14 is adjusted to 35 ℃ every 10 hours and kept for 2 hours, and the water temperature is not controlled at the rest time; the LED lights are turned off during the maintenance of the water temperature.
Example 7
A two-stage fluidized bed domestic sewage treatment device, which is the same as the embodiment 6.
A two-stage fluidized bed domestic sewage treatment method, which is different from the embodiment 6 in that,
the water temperature in the MBBR-1 pool 13 is adjusted to 45 ℃ every 6 hours and kept for 1 hour, and the water temperature is not controlled in the rest time; the water temperature in the MBBR-2 pool 14 is adjusted to 38 ℃ every 12 hours and kept for 3 hours, and the water temperature is not controlled in the rest time; the LED lights are turned off during the maintenance of the water temperature.
Comparative example
A secondary fluidized bed domestic sewage treatment device is different from the device in the embodiment 1 in that the microorganisms are nitrifying bacteria only, and the submerged LED lamp 7 is not arranged in the MBBR-2 pool 14.
Test examples
The tested water is rural domestic sewage. The concentrations of main pollutants of inlet water and outlet water during the test are shown in table 1, and the removal rate of the pollutants is shown in table 2.
TABLE 1
Figure BDA0001818405050000081
Unit: mg/L
TABLE 2
Figure BDA0001818405050000082
As can be seen from tables 1 and 2, the COD removal rate by the method of the present invention was 83.6 to 94.3%, and BOD5The removal rate of (1) is 79.8-92.9% of suspended mattersThe removal rate is 80.1-91.6%, the TN removal rate is 78.7-97.8%, and the ammonia nitrogen removal rate is 94.5-99.2%; the TP removal rate is 88.5-95.2%.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. It will be apparent to those skilled in the art that a number of simple derivations or substitutions can be made without departing from the inventive concept.

Claims (6)

1. A secondary fluidized bed domestic sewage treatment device is characterized by comprising a regulating tank, an anaerobic tank, an MBBR-1 tank and an MBBR-2 tank which are sequentially connected through pipelines;
the adjusting tank is provided with a fiber ball and a submersible pump, and the submersible pump is used for connecting the treated sewage into the anaerobic tank; the anaerobic tank is provided with carbon fibers; the MBBR-1 tank is provided with immobilized microorganism gel and an aeration disc A; the microorganisms in the microorganism gel are nitrifying bacteria and bacillus, and the MBBR-2 tank is provided with immobilized microalgae gel, an aeration disc B and a diving LED lamp; the illumination intensity of the MBBR-2 pool under the irradiation of the diving LED lamp is 3000 LX;
the concentration of nitrifying bacteria in the MBBR-1 pool is 108~109cfu/mL, concentration of Bacillus 109~1010cfu/mL;
Respectively arranging water temperature regulators in the MBBR-1 pool and the MBBR-2 pool, regulating the water temperature of 40-45 ℃ every 5-6 hours in the MBBR-1 pool, keeping the water temperature for 1 hour, and not controlling the water temperature in the rest time; adjusting the water temperature of 35-38 ℃ every 10-12 h in the MBBR-2 pool, keeping the water temperature for 2-3 h, and not controlling the water temperature in the rest time; the LED lights are turned off during the maintenance of the water temperature.
2. A two-stage fluidized bed domestic sewage treatment method based on the device of claim 1, which comprises the following steps:
A. domestic sewage enters the regulating tank through a pipeline, and the sewage treated by the regulating tank is pumped into the anaerobic tank through the submersible pump to react; wherein the retention time of the sewage in the regulating tank is 0.5-4 h;
B. then the sewage enters an MBBR-1 pool, ammonia nitrogen is converted into nitric acid nitrogen through nitrobacteria and bacillus, and organic matters are decomposed to obtain the sewage treated by the MBBR-1 pool;
C. then the sewage treated by the MBBR-1 pool is connected into an MBBR-2 pool, the MBBR-2 pool is provided with immobilized microalgae gel, and the algae in the gel rapidly grow and breed under the irradiation of an aeration disc for supplying oxygen and a diving LED lamp to absorb nitric acid nitrogen and active phosphorus in the water body;
D. and discharging the sewage treated by the MBBR-2 tank through an outlet.
3. The secondary fluidized bed domestic sewage treatment method according to claim 2, wherein the retention time of the sewage in the MBBR-1 tank is 3-6 h.
4. The secondary fluidized bed domestic sewage treatment method according to claim 2, wherein the retention time of the sewage in the MBBR-2 tank is 1.5-2 h.
5. The secondary fluidized bed domestic sewage treatment method of claim 2, wherein said microalgae are chlorella and scenedesmus.
6. The secondary fluidized bed domestic sewage treatment method according to claim 5, wherein the concentration of chlorella in the MBBR-2 tank is 103~105Perilla frutescens/mL, scenedesmus concentration of 104~105one/mL.
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CN205662426U (en) * 2016-05-03 2016-10-26 王建强 Marine domestic sewage treatment unit
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