CN112225310A - Water-feeding dissolved oxygen full-flow control system and operation control method for denitrification filter - Google Patents
Water-feeding dissolved oxygen full-flow control system and operation control method for denitrification filter Download PDFInfo
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Abstract
A denitrification filter tank water inlet dissolved oxygen full-flow control system is characterized in that an aerobic zone, a biological tank water outlet zone, a secondary sedimentation tank, a secondary lift pump room, a carbon source mixing tank and a denitrification filter tank are sequentially connected. A first electric valve is arranged on an outflow pipeline of a biological pond water outlet area, a second electric valve is arranged on a water outlet pipeline of a secondary sedimentation pond, and a third electric valve is arranged on a water outlet pipeline of a denitrification filter pond; and an online dissolved oxygen instrument is arranged at the tail section of the aerobic zone, liquid level meters are arranged in the biological pond water outlet zone, the secondary sedimentation pond water collecting tank and the denitrification filter tank, and the online dissolved oxygen instrument, each electric valve and each liquid level meter are connected with a PLC (programmable logic controller). The system has the advantages of basic control of carbon source loss, obvious saving of carbon source adding cost, reduction of aeration energy consumption and low engineering investment.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a denitrification filter tank inlet dissolved oxygen full-flow control system and an operation control method.
Background
Since the emergence of blue-green algae in Taihu lake in 2007, the deep denitrification process of the denitrification filter tank is gradually applied to the upgrading and modifying project of the first-class A standard (GB18918-2002) of the urban sewage treatment plant in China, in recent years, with the promulgation and implementation of the relatively severe local sewage discharge standard such as Beijing, Tianjin, compound fertilizer, Kunming and the like, the denitrification filter tank process becomes one of the important choices for high-standard deep denitrification of sewage, and plays an important role in ensuring that the TN of the outlet water of the urban sewage treatment plant with the high discharge standard in China stably reaches the standard, but the problems of large ineffective loss of an external carbon source and high cost of adding the carbon source caused by high dissolved oxygen content of the inlet water are commonly found in the practical operation of the existing denitrification filter tank process, and according to research, the DO of the large amount of the denitrification filter tank is as high as 7mg/L and 8mg/L theoretically can cause the ineffective loss of the external carbon source of the denitrification filter, namely, the high-concentration DO of the inlet water of the denitrification filter tank can cause that the sodium acetate solution (the effective content is 25%) of the external carbon source with the average concentration of 50mg/L is inefficiently consumed, and the high-concentration DO of the inlet water of the denitrification filter tank can cause that the adding cost of the carbon source is increased by about 300 ten thousand yuan per year by taking a certain design scale of 10 ten thousand tons per day high-discharge standard urban sewage treatment plant as an example.
Therefore, the control of the dissolved oxygen in the water inlet of the denitrification filter tank has important practical significance for energy conservation and consumption reduction of high-emission standard urban sewage treatment plants. However, the existing denitrification filter inlet dissolved oxygen control technology is basically a terminal denitrification filter inlet dissolved oxygen control technology aiming at the self link of the denitrification filter, and cannot radically solve the problems of high-concentration dissolved oxygen of inlet water of the denitrification filter and ineffective loss of an external carbon source caused by the high-concentration dissolved oxygen.
In order to solve the problem of ineffective carbon source loss caused by inflow dissolved oxygen in the existing denitrification filter process and overcome the defects of the existing denitrification filter inflow dissolved oxygen terminal control technology, a denitrification filter inflow dissolved oxygen full-flow control system and an operation control method are urgently needed to be provided so as to guide the refined design and operation of the denitrification filter process of the urban sewage treatment plant with the high discharge standard in China.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a denitrification filter inlet dissolved oxygen full-flow control system, which can effectively solve the problem of ineffective carbon source loss of high-concentration dissolved oxygen in inlet water of the existing denitrification filter through source control, process control and end control of inlet dissolved oxygen of the denitrification filter, and has the advantages of basic control of carbon source loss, obvious saving of carbon source adding cost, reduction of aeration energy consumption, low engineering investment and the like.
The invention also aims to provide an operation control method of the denitrification filter tank water inlet dissolved oxygen full-flow control system, which is simple and easy to operate.
As conceived above, the technical scheme of the invention is as follows: the utility model provides a denitrification filtering pond full flow control system of dissolved oxygen that intakes, includes aerobic zone (1), biological pond play water zone (2), two heavy ponds (11), secondary elevator pump room (18), carbon source mixing tank (20) and denitrification filtering pond (21) that connect gradually, its characterized in that: a first electric valve (9) is arranged on an outflow pipeline (8) connected with a secondary sedimentation tank (11) in a biological tank water outlet area (2), a second electric valve (16) is arranged on a water outlet pipeline (15) connected with the secondary lifting pump room (18) in the secondary sedimentation tank (11), and a third electric valve (25) is arranged on a water outlet pipeline (24) of a denitrification filter tank (21); be provided with online dissolved oxygen appearance (5) at aerobic zone (1) end section, be provided with first level gauge (4) in biological pond play water zone, be provided with second level gauge (14) in two heavy pond water catch bowl (13), be provided with third level gauge (23) in the denitrification filtering pond, online dissolved oxygen appearance (5) are connected first PLC controller (7), and aerobic zone air-blower (6) are connected simultaneously in first PLC controller (7), first motorised valve (9) and first level gauge (4) are connected with second PLC controller (10) respectively, second motorised valve (16) and second level gauge (14) are connected with third PLC controller (17) respectively, third motorised valve (25) and third level gauge (23) are connected with fourth PLC controller (26) respectively.
The operation control method of the denitrification filter tank water inlet dissolved oxygen full-flow control system comprises the following steps:
a. setting operation control parameters: setting the operation control concentration of the on-line dissolved oxygen meter (5) disposed at the end of the aerobic zone (1) to 0.5-1 mg/L based on the source control; setting 30-40 cm below the top of an aerobic zone effluent weir (3) as an operation control liquid level of a biological pool effluent zone (2) based on process control, controlling the dissolved oxygen increment of the sludge mixed liquor caused by water drop in the biological pool effluent zone to be 1.5mg/L, and further controlling the real-time dissolved oxygen of the inflow sludge mixed liquor of a subsequent secondary sedimentation tank (11) to be 2mg/L as much as possible; setting the operation control liquid level of the secondary sedimentation tank water collecting tank (13) 5-10 cm below the bottom of the secondary sedimentation tank effluent weir (12) based on process control; setting the operation control liquid level of the denitrification filter (21) 5-10 cm below the bottom of the water inlet weir (22) of the denitrification filter as the filtration control liquid level based on the terminal control;
b. the dissolved oxygen concentration monitored by the online dissolved oxygen instrument (5) is transmitted to a first PLC (7) in real time, the first PLC (7) instructs a blower (6) in an aerobic zone to operate the real-time dynamic regulation of the air volume according to an input value, and the dissolved oxygen concentration of the sludge mixed liquor at the end of the aerobic zone is controlled in real time to be set at the dissolved oxygen operation control concentration of 0.5-1 mg/L, so that the source control of the dissolved oxygen concentration of the inlet water of the subsequent denitrification filter is realized;
c. the operation liquid level of the biological pool water outlet area (2) monitored by a first liquid level meter (4) arranged in the biological pool water outlet area (2) is transmitted to a second PLC (10) in real time, the second PLC (10) instructs real-time regulation and control of the operation opening degree of a first electric valve (9) according to an input value, the operation liquid level of the biological pool water outlet area (2) is controlled at a set operation control liquid level in real time, namely 30cm below the top of an aerobic area water outlet weir, the dissolved oxygen increment caused by falling of a sludge mixed liquid in the biological pool water outlet area is controlled to be 1.5mg/L, further the real-time dissolved oxygen of the inflow sludge mixed liquid of a subsequent secondary sedimentation tank (11) is controlled to be 2mg/L as much as possible, and the process control of the concentration of the inflow dissolved oxygen of the subsequent denitrification filter is realized;
d. the running liquid level of the secondary sedimentation tank water collecting tank (13) monitored by a second liquid level meter (14) arranged on the secondary sedimentation tank water collecting tank (13) is transmitted to a third PLC (programmable logic controller) (17) in real time, the third PLC (17) instructs the real-time regulation and control of the running opening of a second electric valve (16) according to an input value, the running liquid level of the secondary sedimentation tank water collecting tank (13) is controlled at a set running control liquid level in real time, namely 5cm below the outlet weir bottom of the secondary sedimentation tank and 10cm, the obvious drop oxygenation effect of the existing secondary sedimentation tank water collecting tank and a drop well is controlled, and the process control of the dissolved oxygen concentration of the subsequent denitrification inlet water is realized;
e. the operation liquid level of the denitrification filter tank (21) during filtration, which is monitored by a third liquid level meter (23) arranged on the denitrification filter tank (21), is transmitted to a fourth PLC (26) in real time, the fourth PLC (26) instructs the real-time dynamic regulation and control of the operation opening of a third electric valve (25) in the filtration period of the denitrification filter tank (21) according to an input value, and the operation liquid level of the denitrification filter tank (21) during filtration is controlled at the set operation control liquid level in real time, namely 5cm below the bottom of a water inlet weir of the denitrification filter tank, so that the obvious drop oxygenation effect during water distribution of the water inlet weir of the denitrification filter tank is controlled, and the tail end control of the dissolved oxygen concentration of the water inlet of the subsequent denitrification filter tank is realized.
Furthermore, the air blower (6) of the aerobic zone adopts a variable frequency fan.
Furthermore, the first electric valve (9), the second electric valve (16) and the third electric valve (25) can be adjusted with the opening degree of 0-100%.
Further, the secondary sedimentation tank (11) is a radial flow type secondary sedimentation tank.
Further, the denitrification filter (21) is a downward flow denitrification filter.
Furthermore, an outflow pipeline (8) of the biological pond water outlet area (2) enters a secondary sedimentation pond (11) in a submerging outflow mode, a secondary sedimentation pond outflow pipeline (15) enters a secondary lift pump room (18) in a submerging outflow mode, and a secondary lift pump room outflow pipeline (19) enters a carbon source mixing pond (20) in a submerging outflow mode.
The invention has the following advantages and positive effects:
1. the invention is based on the deep research of the influence factors of the dissolved oxygen of the inlet water of the denitrification filter, constructs a full flow control system and an operation control method of the dissolved oxygen of the inlet water of the denitrification filter from the perspective of system control, can systematically solve the operation problem of ineffective carbon source loss of the high-concentration dissolved oxygen of the inlet water of the existing denitrification filter through source control, process control and end control, overcomes the defects of the end control technology of the dissolved oxygen of the inlet water of the existing denitrification filter, and has the advantages of basic control of carbon source loss, obvious reduction of the adding cost of the carbon source, remarkable economic and social benefits, simple operation control method, low engineering investment and the like.
2. Based on the source control of dissolved oxygen in the inlet water of the denitrification filter, the invention provides that the control concentration of the dissolved oxygen at the end of the aerobic zone is 0.5-1 mg/L, which is obviously lower than the control concentration (usually 2mg/L) of the dissolved oxygen at the end of the traditional aerobic zone, and is beneficial to the energy conservation and consumption reduction of an aeration system of the aerobic zone.
3. The invention provides that the drop height of the outflow of the aerobic zone is controlled to be 30-40 cm, and the process control of the inflow DO of the subsequent denitrification filter tank is organically coupled with the reduction of the aeration energy consumption of the aerobic zone by fully utilizing the oxygenation of the drop.
4. Based on the process control of dissolved oxygen in the water inlet of the denitrification filter, the invention controls the operating liquid level of the water collecting tank of the secondary sedimentation tank to be 5-10 cm below the bottom of the water outlet weir of the secondary sedimentation tank by arranging the adjustable electric valve on the water outlet pipeline of the secondary sedimentation tank, thereby basically solving the problem of serious drop oxygenation at the traditional water collecting tank and drop well (the DO increment caused by drop can reach 7mg/L generally).
5. The invention has strong pertinence, practicability and operability, can provide a new idea for the fine design and operation of the denitrification filter tank process of the urban sewage treatment plant under the high discharge standard of China, and has important realistic significance for energy conservation and consumption reduction of the sewage treatment plant with the high discharge standard.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a denitrification filter intake dissolved oxygen full-flow control system.
Description of reference numerals: 1-an aerobic zone; 2-a biological pond water outlet area; 3-an effluent weir of the aerobic zone; 4-a first level gauge; 5-online dissolved oxygen instrument; 6-an aerobic zone blower; 7-a first PLC controller; 8-an outflow pipeline of a water outlet zone of the biological pond; 9-a first electrically operated valve; 10-a second PLC controller; 11-a secondary sedimentation tank; 12-secondary sedimentation tank effluent weir; 13-secondary sedimentation tank water collecting tank; 14-a second level gauge; 15-secondary sedimentation tank outlet pipe; 16-a second electrically operated valve; 17-a third PLC controller; 18-a secondary lift pump house; 19-secondary lift pump house outlet conduit; 20-a carbon source mixing tank; 21-denitrification filter; 22-a denitrification filter water inlet weir; 23-a third level gauge; 24-a denitrification filter outlet pipe; 25-third electrically operated valve; 26-fourth PLC controller.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings.
As shown in fig. 1: the invention provides a denitrification filter inlet dissolved oxygen full-flow control system and an operation control method, which comprise an aerobic zone 1, a biological pond water outlet zone 2, a secondary sedimentation tank 11, a secondary lift pump room 18, a carbon source mixing tank 20 and a denitrification filter 21 which are connected in sequence. A first electric valve 9 is arranged on an outflow pipeline 8 connected with a secondary sedimentation tank 11 in a biological tank water outlet area 2, a second electric valve 16 is arranged on an outlet pipeline 15 connected with a secondary lift pump room 18 in the secondary sedimentation tank 11, and a third electric valve 25 is arranged on an outlet pipeline 24 of a denitrification filter 21; be provided with online dissolved oxygen appearance 5 at aerobic zone 1 end, be provided with first level gauge 4 in biological pond play water zone 2, be provided with second level gauge 14 in two heavy pond water catch bowl 13, be provided with third level gauge 23 in the denitrification filtering pond, online dissolved oxygen appearance 5 is connected first PLC controller 7, and aerobic zone air-blower 6 is connected simultaneously to first PLC controller 7, first motorised valve 9 and first level gauge 3 are connected with second PLC controller 10 respectively, second motorised valve 16 and second level gauge 14 are connected with third PLC controller 17 respectively, third motorised valve 25 and third level gauge 23 are connected with fourth PLC controller 26 respectively.
The first PLC controller 7 is used for controlling dissolved oxygen in the denitrification filter tank through water inflow at the source, the second PLC controller 10 and the third PLC controller 17 are used for controlling dissolved oxygen in the denitrification filter tank through water inflow in a process control mode, and the fourth PLC controller 26 is used for controlling dissolved oxygen in the denitrification filter tank through water inflow at the tail end.
And an outflow pipeline 8 of the biological pond water outlet area 2 enters a secondary sedimentation tank 11 in a submerged outflow mode, a secondary sedimentation tank outflow pipeline 15 enters a secondary lift pump room 18 in a submerged outflow mode, and a secondary lift pump room outflow pipeline 19 enters a carbon source mixing tank 20 in a submerged outflow mode so as to control the inflow dissolved oxygen of the subsequent denitrification filter tank in a process.
The blower 6 of the aerobic zone adopts a variable frequency blower, and the size and the power are combined for configuration, so that the real-time control of the dissolved oxygen concentration of the sludge mixed liquor at the tail section of the aerobic zone 1 is facilitated.
The online dissolved oxygen instrument 5 is used for monitoring the dissolved oxygen concentration of the sludge mixed liquor at the tail section of the aerobic zone 1 in real time and is used as a core parameter for guiding the real-time regulation and control of the operation air volume of the blower 6 in the aerobic zone.
The first liquid level meter 4 is used for monitoring the operating liquid level of the water outlet area of the biological pool in real time and is used as a core parameter for guiding the real-time regulation and control of the opening of the first electric valve 9.
The second liquid level meter 14 is used for monitoring the operating liquid level of the secondary sedimentation tank water collecting tank 13 in real time and is used as a core parameter for guiding the real-time regulation and control of the opening degree of the second electric valve 16.
The third liquid level meter 23 is used for monitoring the operating liquid level of the denitrification filter 21 in real time and is used as a core parameter for guiding the real-time regulation and control of the opening of the third electric valve 25.
The first electric valve 9, the second electric valve 16 and the third electric valve 25 can be adjusted, and the opening degree is 0-100%.
The secondary sedimentation tank 11 is a radial flow type secondary sedimentation tank, and the denitrification filter 21 is a downward flow denitrification filter.
The operation control method of the denitrification filter tank water inlet dissolved oxygen full-flow control system is described by combining three embodiments as follows:
example 1: the method mainly comprises the following steps:
a. and setting operation control parameters. Setting the operation control concentration of an online dissolved oxygen instrument 5 at the tail section of an aerobic zone 1 to be 0.5mg/L based on source control; setting 40cm below the top of an aerobic zone effluent weir 3 as an operation control liquid level of a biological pool effluent zone based on process control, namely setting the control drop height of the biological pool effluent zone to be about 40cm, controlling the dissolved oxygen increment caused by the drop of sludge mixed liquor in the biological pool effluent zone to be 1.5mg/L, further controlling the real-time dissolved oxygen of inflow sludge mixed liquor in a subsequent secondary sedimentation tank 11 to be 2mg/L as much as possible, and using the dissolved oxygen for sludge oxygen consumption in the secondary sedimentation tank and preventing the sludge from floating upwards due to anaerobic or denitrification reaction; setting the operation control liquid level of a secondary sedimentation tank water collecting tank 13 to be 5cm below the bottom of a secondary sedimentation tank effluent weir 12 based on process control; setting the operating control liquid level of the denitrification filter 21 at the position 5cm below the bottom 22 of the water inlet weir of the denitrification filter 21 based on the tail end control;
b. the dissolved oxygen concentration monitored by an online dissolved oxygen meter 5 arranged at the tail section of the aerobic zone is transmitted to a first PLC (programmable logic controller) 7 in real time, the first PLC instructs a blower 6 of the aerobic zone to operate the real-time dynamic regulation and control of the air volume according to an input value, the dissolved oxygen concentration of the sludge mixed liquor at the tail section of the aerobic zone is controlled at the set dissolved oxygen operation control concentration of 0.5mg/L in real time, and the source control of the dissolved oxygen concentration of the inlet water of the subsequent denitrification filter is realized;
c. the operation liquid level of the biological pool water outlet area monitored by a first liquid level meter 4 arranged in the biological pool water outlet area is transmitted to a second PLC (programmable logic controller) 10 in real time, the second PLC instructs the real-time regulation and control of the operation opening of a first electric valve 9 according to an input value, the operation liquid level of the biological pool water outlet area 2 is controlled at a set operation control liquid level (40 cm below the water outlet weir crest of an aerobic area) in real time, the dissolved oxygen increment caused by the falling of sludge mixed liquid in the biological pool water outlet area is controlled to be 1.5mg/L, then the inflow sludge mixed liquid of a subsequent secondary sedimentation tank 11 is controlled to be 2mg/L as much as possible, and the process control of the dissolved oxygen concentration of the inflow sludge filtering tank of the subsequent denitrification is realized;
d. the operation liquid level of the secondary sedimentation tank water collecting tank monitored by a second liquid level meter 14 arranged on the secondary sedimentation tank water collecting tank is transmitted to a third PLC (programmable logic controller) 17 in real time, the third PLC instructs the real-time regulation and control of the operation opening of a second electric valve 16 according to an input value, the operation liquid level of the secondary sedimentation tank water collecting tank 13 is controlled at a set operation control liquid level (5 cm below the bottom of a secondary sedimentation tank water outlet weir) in real time, the obvious drop oxygenation effect of the existing secondary sedimentation tank water collecting tank and a drop well is controlled, and the process control of the concentration of dissolved oxygen of the inlet water of the subsequent denitrification filter is realized;
e. the operation liquid level of the denitrification filter tank during filtration, which is monitored by a third liquid level meter 23 arranged on the denitrification filter tank, is transmitted to a fourth PLC 26 in real time, the fourth PLC instructs the real-time dynamic regulation and control of the operation opening of a third electric valve 25 in the filtration period of the denitrification filter tank according to an input value, and controls the operation liquid level of the denitrification filter tank 21 during filtration at a set operation control liquid level (5 cm below the bottom of a water inlet weir of the denitrification filter tank) in real time so as to control the obvious drop oxygenation effect during water distribution of the water inlet weir of the denitrification filter tank and realize the terminal control of the dissolved oxygen concentration of the water inlet of the subsequent denitrification filter tank.
Example 2: the method mainly comprises the following steps:
a. and setting operation control parameters. Setting the operation control concentration of an online dissolved oxygen instrument 5 at the tail section of an aerobic zone 1 to be 1mg/L based on source control; setting 30cm below the top of an aerobic zone effluent weir 3 as an operation control liquid level of a biological pool effluent zone based on process control, namely setting the control drop height of the biological pool effluent zone to be about 30cm, controlling the dissolved oxygen increment of a sludge mixed liquor in the biological pool effluent zone drop to be 1mg/L, further controlling the real-time dissolved oxygen of the inflow sludge mixed liquor of a subsequent secondary sedimentation tank 11 to be 2mg/L as much as possible, and using the dissolved oxygen for sludge oxygen consumption in the secondary sedimentation tank and preventing sludge from floating up due to anaerobic or denitrification reaction; setting 10cm below the bottom of a secondary sedimentation tank effluent weir 12 as a secondary sedimentation tank water collecting tank 13 operation control liquid level based on process control; setting 10cm below the bottom 22 of a water inlet weir of the denitrification filter 21 as an operation control liquid level of the denitrification filter 21 during filtration based on terminal control;
b. the dissolved oxygen concentration monitored by an online dissolved oxygen meter 5 arranged at the tail section of the aerobic zone is transmitted to a first PLC (programmable logic controller) 7 in real time, the first PLC instructs a blower 6 of the aerobic zone to operate the real-time dynamic regulation and control of the air volume according to an input value, the dissolved oxygen concentration of the sludge mixed liquor at the tail section of the aerobic zone is controlled at the set dissolved oxygen operation control concentration of 1mg/L in real time, and the source control of the dissolved oxygen concentration of the inlet water of the subsequent denitrification filter tank is realized;
c. the operation liquid level of the biological pool water outlet area monitored by a first liquid level meter 4 arranged in the biological pool water outlet area is transmitted to a second PLC (programmable logic controller) 10 in real time, the second PLC instructs real-time regulation and control of the operation opening of a first electric valve 9 according to an input value, the operation liquid level of the biological pool water outlet area 2 is controlled at a set operation control liquid level (30 cm below an aerobic area water outlet weir crest) in real time, the dissolved oxygen increment caused by water drop of sludge mixed liquid in the biological pool water outlet area is controlled to be 1mg/L, then the inflow sludge mixed liquid of a subsequent secondary sedimentation tank 11 is controlled to be 2mg/L as much as possible in real time dissolved oxygen, and the process control of the dissolved oxygen concentration of the inflow sludge mixed liquid of the subsequent denitrification is;
d. the operation liquid level of the secondary sedimentation tank water collecting tank monitored by a second liquid level meter 14 arranged on the secondary sedimentation tank water collecting tank is transmitted to a third PLC (programmable logic controller) 17 in real time, the third PLC instructs the real-time regulation and control of the operation opening of a second electric valve 16 according to an input value, the operation liquid level of the secondary sedimentation tank water collecting tank 13 is controlled at a set operation control liquid level (10 cm below the bottom of a secondary sedimentation tank water outlet weir) in real time, the obvious drop oxygenation effect of the existing secondary sedimentation tank water collecting tank and a drop well is controlled, and the process control of the concentration of dissolved oxygen of the inlet water of the subsequent denitrification filter is realized;
e. the operation liquid level of the denitrification filter tank during filtration, which is monitored by a third liquid level meter 23 arranged on the denitrification filter tank, is transmitted to a fourth PLC 26 in real time, the fourth PLC instructs the real-time dynamic regulation and control of the operation opening of a third electric valve 25 in the filtration period of the denitrification filter tank according to an input value, and controls the operation liquid level of the denitrification filter tank 21 during filtration at a set operation control liquid level (10 cm below the bottom of a water inlet weir of the denitrification filter tank) in real time so as to control the obvious drop oxygenation effect during water distribution of the water inlet weir of the denitrification filter tank and realize the terminal control of the dissolved oxygen concentration of the water inlet of the subsequent denitrification filter tank.
Example three: the method mainly comprises the following steps:
a. and setting operation control parameters. Setting the operation control concentration of an online dissolved oxygen instrument 5 at the tail section of an aerobic zone 1 to be 0.5mg/L based on source control; setting 40cm below the top of an aerobic zone effluent weir 3 as an operation control liquid level of a biological pool effluent zone based on process control, namely setting the control drop height of the biological pool effluent zone to be about 40cm, controlling the dissolved oxygen increment caused by the drop of sludge mixed liquor in the biological pool effluent zone to be 1.5mg/L, further controlling the real-time dissolved oxygen of inflow sludge mixed liquor in a subsequent secondary sedimentation tank 11 to be 2mg/L as much as possible, and using the dissolved oxygen for sludge oxygen consumption in the secondary sedimentation tank and preventing the sludge from floating upwards due to anaerobic or denitrification reaction; setting 10cm below the bottom of a secondary sedimentation tank effluent weir 12 as a secondary sedimentation tank water collecting tank 13 operation control liquid level based on process control; setting the operating control liquid level of the denitrification filter 21 at the position 5cm below the bottom 22 of the water inlet weir of the denitrification filter 21 based on the tail end control;
b. the dissolved oxygen concentration monitored by an online dissolved oxygen meter 5 arranged at the tail section of the aerobic zone is transmitted to a first PLC (programmable logic controller) 7 in real time, the first PLC instructs a blower 6 of the aerobic zone to operate the real-time dynamic regulation and control of the air volume according to an input value, the dissolved oxygen concentration of the sludge mixed liquor at the tail section of the aerobic zone is controlled at the set dissolved oxygen operation control concentration of 0.5mg/L in real time, and the source control of the dissolved oxygen concentration of the inlet water of the subsequent denitrification filter is realized;
c. the operation liquid level of the effluent area of the biological pool, which is monitored by a first liquid level meter 4 arranged in the effluent area of the biological pool, is transmitted to a second PLC (programmable logic controller) 10 in real time, the second PLC instructs the real-time regulation and control of the operation opening of a first electric valve 9 according to an input value, the operation liquid level of the effluent area 2 of the biological pool is controlled to be a set operation control liquid level (40 cm below the effluent weir crest of an aerobic area) in real time, the dissolved oxygen increment caused by the drop of sludge mixed liquid in the effluent area of the biological pool is controlled to be 1.5mg/L, then the inflow sludge mixed liquid of a subsequent secondary sedimentation pool 11 is controlled to be 2mg/L as much as possible, and the process control of the inflow dissolved oxygen concentration of the subsequent denitrification;
d. the operation liquid level of the secondary sedimentation tank water collecting tank monitored by a second liquid level meter 14 arranged on the secondary sedimentation tank water collecting tank is transmitted to a third PLC (programmable logic controller) 17 in real time, the third PLC instructs the real-time regulation and control of the operation opening of a second electric valve 16 according to an input value, the operation liquid level of the secondary sedimentation tank water collecting tank 13 is controlled at a set operation control liquid level (10 cm below the bottom of a secondary sedimentation tank water outlet weir) in real time, the obvious drop oxygenation effect of the existing secondary sedimentation tank water collecting tank and a drop well is controlled, and the process control of the concentration of dissolved oxygen of the inlet water of the subsequent denitrification filter is realized;
e. the operation liquid level of the denitrification filter tank during filtration, which is monitored by a third liquid level meter 23 arranged on the denitrification filter tank, is transmitted to a fourth PLC 26 in real time, the fourth PLC instructs the real-time dynamic regulation and control of the operation opening of a third electric valve 25 in the filtration period of the denitrification filter tank according to an input value, and controls the operation liquid level of the denitrification filter tank 21 during filtration at a set operation control liquid level (5 cm below the bottom of a water inlet weir of the denitrification filter tank) in real time so as to control the obvious drop oxygenation effect during water distribution of the water inlet weir of the denitrification filter tank and realize the terminal control of the dissolved oxygen concentration of the water inlet of the subsequent denitrification filter tank.
The embodiments described above are provided to enable persons skilled in the art to make or use the invention, and persons skilled in the art may make modifications or changes to the embodiments described above without departing from the inventive idea of the invention, so that the protective scope of the invention is not limited by the embodiments described above, but should be accorded the widest scope consistent with the innovative features set forth in the claims.
Claims (7)
1. The utility model provides a denitrification filtering pond full flow control system of dissolved oxygen that intakes, includes aerobic zone (1), biological pond play water zone (2), two heavy ponds (11), secondary elevator pump room (18), carbon source mixing tank (20) and denitrification filtering pond (21) that connect gradually, its characterized in that: a first electric valve (9) is arranged on an outflow pipeline (8) connected with a secondary sedimentation tank (11) in a biological tank water outlet area (2), a second electric valve (16) is arranged on a water outlet pipeline (15) connected with the secondary lifting pump room (18) in the secondary sedimentation tank (11), and a third electric valve (25) is arranged on a water outlet pipeline (24) of a denitrification filter tank (21); be provided with online dissolved oxygen appearance (5) at aerobic zone (1) end section, be provided with first level gauge (4) in biological pond play water zone, be provided with second level gauge (14) in two heavy pond water catch bowl (13), be provided with third level gauge (23) in the denitrification filtering pond, online dissolved oxygen appearance (5) are connected first PLC controller (7), and aerobic zone air-blower (6) are connected simultaneously in first PLC controller (7), first motorised valve (9) and first level gauge (4) are connected with second PLC controller (10) respectively, second motorised valve (16) and second level gauge (14) are connected with third PLC controller (17) respectively, third motorised valve (25) and third level gauge (23) are connected with fourth PLC controller (26) respectively.
2. An operation control method of a denitrification filter inlet water dissolved oxygen full flow control system according to claim 1, characterized in that: the method comprises the following steps:
a. setting operation control parameters: setting the operation control concentration of the on-line dissolved oxygen meter (5) disposed at the end of the aerobic zone (1) to 0.5-1 mg/L based on the source control; setting 30-40 cm below the top of an aerobic zone effluent weir (3) as an operation control liquid level of a biological pool effluent zone (2) based on process control, controlling the dissolved oxygen increment of the sludge mixed liquor caused by water drop in the biological pool effluent zone to be 1.5mg/L, and further controlling the real-time dissolved oxygen of the inflow sludge mixed liquor of a subsequent secondary sedimentation tank (11) to be 2mg/L as much as possible; setting the operation control liquid level of the secondary sedimentation tank water collecting tank (13) 5-10 cm below the bottom of the secondary sedimentation tank effluent weir (12) based on process control; setting the operation control liquid level of the denitrification filter (21) 5-10 cm below the bottom of the water inlet weir (22) of the denitrification filter as the filtration control liquid level based on the terminal control;
b. the dissolved oxygen concentration monitored by the online dissolved oxygen instrument (5) is transmitted to a first PLC (7) in real time, the first PLC (7) instructs a blower (6) in an aerobic zone to operate the real-time dynamic regulation of the air volume according to an input value, and the dissolved oxygen concentration of the sludge mixed liquor at the end of the aerobic zone is controlled in real time to be set at the dissolved oxygen operation control concentration of 0.5-1 mg/L, so that the source control of the dissolved oxygen concentration of the inlet water of the subsequent denitrification filter is realized;
c. the operation liquid level of the biological pool water outlet area (2) monitored by a first liquid level meter (4) arranged in the biological pool water outlet area (2) is transmitted to a second PLC (10) in real time, the second PLC (10) instructs real-time regulation and control of the operation opening degree of a first electric valve (9) according to an input value, the operation liquid level of the biological pool water outlet area (2) is controlled at a set operation control liquid level in real time, namely 30cm below the top of an aerobic area water outlet weir, the dissolved oxygen increment caused by falling of a sludge mixed liquid in the biological pool water outlet area is controlled to be 1.5mg/L, further the real-time dissolved oxygen of the inflow sludge mixed liquid of a subsequent secondary sedimentation tank (11) is controlled to be 2mg/L as much as possible, and the process control of the concentration of the inflow dissolved oxygen of the subsequent denitrification filter is realized;
d. the running liquid level of the secondary sedimentation tank water collecting tank (13) monitored by a second liquid level meter (14) arranged on the secondary sedimentation tank water collecting tank (13) is transmitted to a third PLC (programmable logic controller) (17) in real time, the third PLC (17) instructs the real-time regulation and control of the running opening of a second electric valve (16) according to an input value, the running liquid level of the secondary sedimentation tank water collecting tank (13) is controlled at a set running control liquid level in real time, namely 5cm below the outlet weir bottom of the secondary sedimentation tank and 10cm, the obvious drop oxygenation effect of the existing secondary sedimentation tank water collecting tank and a drop well is controlled, and the process control of the dissolved oxygen concentration of the subsequent denitrification inlet water is realized;
e. the operation liquid level of the denitrification filter tank (21) during filtration, which is monitored by a third liquid level meter (23) arranged on the denitrification filter tank (21), is transmitted to a fourth PLC (26) in real time, the fourth PLC (26) instructs the real-time dynamic regulation and control of the operation opening of a third electric valve (25) in the filtration period of the denitrification filter tank (21) according to an input value, and the operation liquid level of the denitrification filter tank (21) during filtration is controlled at the set operation control liquid level in real time, namely 5cm below the bottom of a water inlet weir of the denitrification filter tank, so that the obvious drop oxygenation effect during water distribution of the water inlet weir of the denitrification filter tank is controlled, and the tail end control of the dissolved oxygen concentration of the water inlet of the subsequent denitrification filter tank is realized.
3. The system for controlling the whole flow of dissolved oxygen in the influent water of the denitrification filter tank as claimed in claim 1, wherein: the aerobic zone blower (6) adopts a variable frequency fan.
4. The system for controlling the whole flow of dissolved oxygen in the influent water of the denitrification filter tank as claimed in claim 1, wherein: the first electric valve (9), the second electric valve (16) and the third electric valve (25) can be adjusted, and the opening degree is 0-100%.
5. The system for controlling the whole flow of dissolved oxygen in the influent water of the denitrification filter tank as claimed in claim 1, wherein: the secondary sedimentation tank (11) is a radial flow type secondary sedimentation tank.
6. The system for controlling the whole flow of dissolved oxygen in the influent water of the denitrification filter tank as claimed in claim 1, wherein: the denitrification filter (21) is a downward flow denitrification filter.
7. The system for controlling the whole flow of dissolved oxygen in the influent water of the denitrification filter tank as claimed in claim 1, wherein: and an outflow pipeline (8) of the biological pond water outlet area (2) enters a secondary sedimentation pond (11) in a submerging outflow mode, a secondary sedimentation pond outflow pipeline (15) enters a secondary lifting pump room (18) in a submerging outflow mode, and a secondary lifting pump room outflow pipeline (19) enters a carbon source mixing pond (20) in a submerging outflow mode.
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