CN108773980B - BDO wastewater treatment process - Google Patents
BDO wastewater treatment process Download PDFInfo
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- CN108773980B CN108773980B CN201810697842.5A CN201810697842A CN108773980B CN 108773980 B CN108773980 B CN 108773980B CN 201810697842 A CN201810697842 A CN 201810697842A CN 108773980 B CN108773980 B CN 108773980B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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Abstract
The invention discloses a BDO wastewater treatment process which comprises the steps of homogenizing, hydrolytic acidification, anaerobic treatment, aerobic treatment and precipitation, wherein effluent enters a discharge tank and is discharged or refluxed. The secondary sedimentation tank is provided with two tanks, namely a secondary sedimentation tank A and a secondary sedimentation tank B, the bottoms of the secondary sedimentation tank A and the secondary sedimentation tank B are respectively provided with a mud conveying pipeline A and a mud conveying pipeline B, the mud conveying pipeline A and the mud conveying pipeline B are communicated with the sludge storage tank, a partition wall is arranged in the sludge storage tank to divide the sludge storage tank into the sludge storage tank A and the sludge storage tank B, and the secondary sedimentation tank A and the secondary sedimentation tank B are communicated with the discharge tank through overflow pipelines. The sludge storage tank adopts a novel structure, avoids the generation of a bias flow phenomenon between the secondary sedimentation tank and the sludge storage tank, and solves the problem of sludge accumulation at the bottom of the secondary sedimentation tank. By adopting the process, the cost of glucose added for stopping the system is saved every month. But also avoids the fluctuation of the sewage treatment system caused by the reduction of the waste water due to insufficient waste water, so that the sewage station can continuously and stably operate.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a BDO wastewater treatment process.
Background
Liu quiet etc. have introduced BDO waste water treatment process, directly get into the equalizing basin with low concentration formaldehyde high concentration waste water, contain formaldehyde high concentration waste water and get into the oil interceptor jointly with the equalizing basin water and degrease after sodium hypochlorite handles, pass through preheating the pond and heat, then pass TBF reaction tank and handle, get into the second grade pond, finally to going out the water detection pond, then discharge. The Zhao Ninghua and the like adopt a UASB/multiplication composite aerobic biochemical reactor/coagulating sedimentation/advanced oxidation/biological carbon filter process aiming at BDO wastewater to obtain better effect. In the industry, the BDO wastewater treatment process is introduced relatively, but the operation mode of the BDO wastewater industrial treatment process is not introduced sufficiently, the secondary sedimentation tank is easy to generate dead sludge, and more BDO wastewater treatment processes have design defects on reclaimed water reuse and lack of a backflow circulation operation mode, so that the sewage station has high operation cost caused by the fact that a sewage treatment system stops and glucose is added during the periods of insufficient raw water supply, no discharge of the sewage station, system stop and discharge and stop.
Disclosure of Invention
In order to solve the technical defects of the sewage treatment system, the invention provides a BDO wastewater treatment process which mainly adopts homogeneous regulation and mixing, hydrolytic acidification, sludge-water separation, high-efficiency anaerobic treatment and aerobic treatment. The aerobic tank and the sludge storage tank are improved, a control point is added for water inlet of the aerobic tank, and the associated water inlet mode is changed into an independent parallel water inlet mode, so that the problems that the aerobic tank has uneven water inlet and cannot be controlled and adjusted are solved; the sludge storage tank is additionally provided with the partition wall, so that the relevance among the multiple secondary sedimentation tanks is changed, and the problems of bias flow formed between the multiple secondary sedimentation tanks and the sludge storage tank and dead sludge generated by sludge deposition in the secondary sedimentation tanks are solved; and the idea of circular operation of the sewage treatment system is introduced, so that the problems of system fluctuation and improvement of operation cost caused by the fact that the sewage treatment system stops adding glucose during the periods of insufficient raw water supply, no discharge in a sewage station, and system stop and discharge of single BDO wastewater are solved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a BDO wastewater treatment process comprises the following steps:
(1) homogenizing: the original BDO wastewater is divided into high-concentration BDO wastewater and low-concentration BDO wastewater, and a separation and concentration combined treatment mode is adopted, namely the low-concentration BDO wastewater enters a homogenizing adjusting tank, the high-concentration BDO wastewater is collected in a concentrated mode and is conveyed to the homogenizing adjusting tank step by step in batches to be mixed and adjusted with the low-concentration BDO wastewater, the C, N, P ratio is controlled to be (100-200): 5:1, and the pH is adjusted to be 6-8;
(2) hydrolysis and acidification: the wastewater after being homogenized and the pH value of the wastewater is fed into a hydrolysis acidification tank, the hydrolysis acidification tank is used for feeding water upwards and discharging water downwards, the operation mode is a complete mixing mode, so that the mud and the water are in a complete mixing state, and the stirring mode is a submerged impeller stirring mode;
(3) anaerobic reaction: after the effluent of the hydrolysis acidification tank passes through a sedimentation tank to separate mud and water, adjusting the temperature of the effluent to 36 +/-2 ℃ (if the temperature is too low, the activity of bacteria is reduced, if the temperature is too high, protein denaturation and bacterial death are easily caused), adjusting the pH to 5.5-9.0, then entering an HAF anaerobic process, and refluxing sludge to the hydrolysis acidification tank for recycling;
(4) aerobic treatment: HAF anaerobic effluent enters a comprehensive regulating tank, the ratio of C, N, P is regulated to be (50-150): 5:1, and dissolved oxygen is improved by pre-aeration and enters an aerobic tank;
(5) and (3) precipitation: the effluent of the aerobic tank enters a secondary sedimentation tank, sludge enters a sludge storage tank through gravity sedimentation after mud-water separation, the operation modes between the multiple secondary sedimentation tanks and the sludge storage tank are independent and parallel operation, part of sludge is used for backflow, and part of sludge is sent to a sludge filter press for sludge discharge; and the effluent enters a discharge pool for discharging or refluxing.
And (4) the aerobic tank in the step (4) is composed of 4 oxidation ditches, the water trend is S-shaped, the reflux in the aerobic tank is that reaction liquid flows back from the tail end of the tank to the front end of the tank, and the dissolved oxygen in the tank is improved in an aeration mode.
The retention time of the aerobic tank in the step (4) is 60 hours.
In the step (5), the secondary sedimentation tank is provided with two tanks, namely a secondary sedimentation tank A and a secondary sedimentation tank B, the bottoms of the secondary sedimentation tank A and the secondary sedimentation tank B are respectively provided with a mud conveying pipeline A and a mud conveying pipeline B, the mud conveying pipeline A and the mud conveying pipeline B are communicated with the sludge storage tank, a partition wall is arranged in the sludge storage tank to divide the sludge storage tank into the sludge storage tank A and the sludge storage tank B, and the secondary sedimentation tank A and the secondary sedimentation tank B are communicated with the discharge tank through overflow pipelines.
And (5) in the step (5), when the system normally operates, discharging water in the discharge pool, when the system abnormally operates, starting a return pipeline during the periods of insufficient raw water supply, discharge prohibition of a sewage station, system discharge stop and stop, returning the water from the discharge pool to the regulating reservoir, and performing partial circulation or full circulation on the premise of stabilizing the water quality and the water quantity according to the actual operation condition.
The invention has the beneficial effects that: the sludge storage tank adopts a novel structure, avoids the generation of a bias flow phenomenon between the secondary sedimentation tank and the sludge storage tank, and solves the problem of sludge accumulation at the bottom of the secondary sedimentation tank. By adopting the process, the cost of glucose added for stopping the system is saved every month. But also avoids the fluctuation of the sewage treatment system caused by the reduction of the waste water due to insufficient waste water, so that the sewage station can continuously and stably operate.
Drawings
FIG. 1 is a block diagram of a BDO wastewater treatment process of the invention.
FIG. 2 is a top view of the aerobic tank of the present invention.
FIG. 3 is a schematic structural view of a secondary sedimentation tank, a sludge storage tank and a discharge tank of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the following examples are illustrative only and are not intended to limit the scope of the invention, which is to be given numerous insubstantial modifications and adaptations by those skilled in the art based on the teachings set forth above.
A BDO wastewater treatment process comprises the following steps:
(1) homogenizing: the original BDO wastewater is divided into high-concentration BDO wastewater and low-concentration BDO wastewater, and a separation and concentration combined treatment mode is adopted, namely the low-concentration BDO wastewater enters a homogenizing adjusting tank, the high-concentration BDO wastewater is collected in a concentrated mode and is conveyed to the homogenizing adjusting tank step by step in batches to be mixed and adjusted with the low-concentration BDO wastewater, the C, N, P ratio is controlled to be (100-200): 5:1, and the pH is adjusted to be 6-8;
(2) hydrolysis and acidification: the wastewater after being homogenized and the pH value of the wastewater is fed into a hydrolysis acidification tank, the hydrolysis acidification tank is used for feeding water upwards and discharging water downwards, the operation mode is a complete mixing mode, so that the mud and the water are in a complete mixing state, and the stirring mode is a submerged impeller stirring mode;
(3) anaerobic reaction: after the effluent of the hydrolysis acidification tank passes through a sedimentation tank to separate mud and water, adjusting the temperature of the effluent to 36 +/-2 ℃ (if the temperature is too low, the activity of bacteria is reduced, if the temperature is too high, protein denaturation and bacterial death are easily caused), adjusting the pH to 5.5-9.0, then entering an HAF anaerobic process, and refluxing sludge to the hydrolysis acidification tank for recycling;
(4) aerobic treatment: HAF anaerobic effluent enters a comprehensive regulating tank, the ratio of C, N, P is regulated to be (50-150): 5:1, dissolved oxygen is improved through pre-aeration, and the dissolved oxygen enters an aerobic tank, and the retention time of the aerobic tank is 60 hours; the aerobic tank is composed of 4 oxidation ditches, the water trend is S-shaped, the reflux in the aerobic tank is that reaction liquid flows back from the tail end of the tank to the front end of the tank, and the dissolved oxygen in the tank is improved in an aeration mode. FIG. 2 is a top view of two rows of aerobic tanks running in parallel, wherein 23 and 24 are water inlet pipes of the two rows of aerobic tanks, and water enters respective water distributors through the water inlet pipes; in the figure, 31 and 32 are two rows of water outlets of the aerobic tank, water flows to a secondary sedimentation tank through an outlet part for sedimentation and separation, and part of the water is conveyed to jet flow aerators 25, 26, 27 and 28, 29, 30 by an internal reflux pump and then returned to the aerobic tank again.
(5) And (3) precipitation: the effluent of the aerobic tank enters a secondary sedimentation tank, sludge enters a sludge storage tank through gravity sedimentation after mud-water separation, the operation modes between the multiple secondary sedimentation tanks and the sludge storage tank are independent and parallel operation, part of sludge is used for backflow, and part of sludge is sent to a sludge filter press for sludge discharge; the effluent enters a discharge tank and is discharged or reflows; as shown in fig. 3, the secondary sedimentation tank has two seats, which are respectively a secondary sedimentation tank a33 and a secondary sedimentation tank B34, the bottoms of the secondary sedimentation tank a33 and the secondary sedimentation tank B34 are respectively provided with a mud conveying pipeline a35 and a mud conveying pipeline B36, the mud conveying pipeline a35 and the mud conveying pipeline B36 are communicated with the sludge storage tank, the sludge storage tank is internally provided with a partition wall 39 which divides the sludge storage tank into a sludge storage tank a37 and a sludge storage tank B38, and the secondary sedimentation tank a33 and the secondary sedimentation tank B34 are communicated with the discharge tank 40 through overflow pipelines.
When the system normally operates, water in the discharge pool is discharged, and when the system abnormally operates, the water is discharged: and during the periods of insufficient raw water supply, no discharge of the sewage station, system discharge stopping and stopping, starting a return pipeline, returning from the discharge tank to the regulating tank, and performing partial circulation or full circulation on the premise of stabilizing water quality and water quantity according to actual operation conditions.
The single BDO wastewater can be treated by the embodiment, so that COD can be reduced to 150-200 mg/L from 3000mg/L, the three-level discharge standard is achieved, and the single BDO wastewater can directly enter a park sewage station.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A BDO wastewater treatment process is characterized by comprising the following steps:
(1) homogenizing: the original BDO wastewater is divided into high-concentration BDO wastewater and low-concentration BDO wastewater, and a separation and concentration combined treatment mode is adopted, namely the low-concentration BDO wastewater enters a homogenizing adjusting tank, the high-concentration BDO wastewater is collected in a concentrated mode and is conveyed to the homogenizing adjusting tank step by step in batches to be mixed and adjusted with the low-concentration BDO wastewater, the C, N, P ratio is controlled to be (100-200): 5:1, and the pH is adjusted to be 6-8;
(2) hydrolysis and acidification: the wastewater after being homogenized and the pH value of the wastewater is fed into a hydrolysis acidification tank, the hydrolysis acidification tank is used for feeding water upwards and discharging water downwards, the operation mode is a complete mixing mode, so that the mud and the water are in a complete mixing state, and the stirring mode is a submerged impeller stirring mode;
(3) anaerobic reaction: separating mud and water from the water discharged from the hydrolysis acidification tank through a sedimentation tank, adjusting the temperature of the discharged water to 36 +/-2 ℃, adjusting the pH to 5.5-9.0, then entering an HAF anaerobic process, and refluxing sludge to the hydrolysis acidification tank for recycling;
(4) aerobic treatment: HAF anaerobic effluent enters a comprehensive regulating tank, the ratio of C, N, P is regulated to be (50-150): 5:1, and dissolved oxygen is improved by pre-aeration and enters an aerobic tank;
(5) and (3) precipitation: the effluent of the aerobic tank enters a secondary sedimentation tank, sludge enters a sludge storage tank through gravity sedimentation after mud-water separation, the operation modes between the multiple secondary sedimentation tanks and the sludge storage tank are independent and parallel operation, part of sludge is used for backflow, and part of sludge is sent to a sludge filter press for sludge discharge; the effluent enters a discharge tank and is discharged or reflows;
in the step (5), the secondary sedimentation tank is provided with two tanks, namely a secondary sedimentation tank A (33) and a secondary sedimentation tank B (34), the bottoms of the secondary sedimentation tank A (33) and the secondary sedimentation tank B (34) are respectively provided with a mud conveying pipeline A (35) and a mud conveying pipeline B (36), the mud conveying pipeline A (35) and the mud conveying pipeline B (36) are communicated with the sludge storage tank, the sludge storage tank is internally provided with a partition wall (39) to divide the sludge storage tank into a sludge storage tank A (37) and a sludge storage tank B (38), and the secondary sedimentation tank A (33) and the secondary sedimentation tank B (34) are communicated with the discharge tank (40) through overflow pipelines;
and (5) in the step (5), when the system normally operates, discharging water in the discharge pool, when the system abnormally operates, starting a return pipeline during the periods of insufficient raw water supply, discharge prohibition of a sewage station, system discharge stop and stop, returning the water from the discharge pool to the regulating reservoir, and performing partial circulation or full circulation on the premise of stabilizing the water quality and the water quantity according to the actual operation condition.
2. The BDO wastewater treatment process of claim 1, wherein: and (4) the aerobic tank in the step (4) is composed of 4 oxidation ditches, the water trend is S-shaped, the reflux in the aerobic tank is that reaction liquid flows back from the tail end of the tank to the front end of the tank, and the dissolved oxygen in the tank is improved in an aeration mode.
3. The BDO wastewater treatment process of claim 1, wherein: the retention time of the aerobic tank in the step (4) is 60 hours.
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