Aeration system of Orbal oxidation ditch

Abstract

The utility model discloses an Orbal oxidation ditch aeration system which comprises an outer ditch aeration and data acquisition unit, a middle ditch aeration and data acquisition unit, an inner ditch aeration and data acquisition unit, a dissolved oxygen control unit and a PLC (Programmable Logic Controller) control unit. According to the utility model, the air volume of the magnetic suspension fan and the starting number of the rotating disc aerators in the outer ditch and the inner ditch can be comprehensively calculated and controlled through the data of the water inlet flow meter, the water inlet online detection data and the PLC (programmable logic controller). According to historical data of an oxidation ditch dissolved oxygen meter, a sludge concentration meter, a gas flow meter and other online instruments, the PLC automatically calculates and corrects parameters in a timed mode, the gas supply amount of the magnetic suspension draught fan and the starting number of the rotating disc aerators are adjusted, and the intelligent aeration effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an Orbal oxidation ditch aeration system. BACKGROUND

[0002] Orbal oxidation ditches, also known as concentric circle oxidation ditches, are typically composed of three concentric elliptical channels. Sewage first enters the outer channel and mixes with return sludge, then passes through the outer channel, the middle channel, and finally enters the inner channel, circulating several hundred to several tens of times in each channel. Finally, the sewage flows out through the adjustable weir gate of the center island into the secondary sedimentation tank.

[0003] Different numbers of horizontal rotating disc aerators are installed across each channel, which not only supply oxygen but also have strong plug flow stirring effect. The dissolved oxygen concentrations in the outer, middle, and inner channels are controlled at 0-0.3 mg / L, 0.5-1.5 mg / L, and 2-3 mg / L, respectively. By controlling the aeration intensity, the oxygen supply rate of the outer channel is similar to the aerobic rate in the channel, ensuring the nitrification reaction of the mixed liquor. At the same time, due to the low dissolved oxygen concentration, denitrifying bacteria can use nitrate as an electron acceptor for denitrification. The reaction process in the middle channel is a simultaneous nitrification and denitrification process. However, the existing Orbal oxidation ditch has the following problems:

[0004] 1. The oxygenation capacity of the horizontal rotating disc aerator is low, the energy consumption is high, and the maintenance frequency is high, the maintenance cycle is long, and the maintenance cost is high.

[0005] 2. The dissolved oxygen control is extensive, relying on the experience and technology of the operator, and the control range is wide, resulting in energy waste.

[0006] 3. When the influent water quality is high, especially in summer, the oxygen transfer efficiency is low, and more horizontal rotating disc aerators need to be turned on. Even so, sometimes it may not be able to reach the design requirement of dissolved oxygen value even if all the horizontal rotating disc aerators are turned on.

[0007] In view of these problems, the design and operation of the Orbal oxidation ditch need to be optimized to improve its efficiency and reliability, reduce energy consumption and maintenance cost. UTILITY MODEL CONTENTS

[0008] The utility model aims at providing an Orbal oxidation ditch aeration system.

[0009] The technical scheme of the utility model is as follows:

[0010] An Orbal oxidation ditch aeration system, comprising: an outer channel aeration and data acquisition unit, a middle channel aeration and data acquisition unit, an inner channel aeration and data acquisition unit, a dissolved oxygen control unit, and a PLC control unit,

[0011] The outer channel aeration and data acquisition unit comprises first to fourth outer channel rotating disc aerators, first to second outer channel sludge concentration meters, first to second outer channel flow pushers, first to second outer channel speed meters and first to second outer channel dissolved oxygen meters. The first to fourth outer channel rotating disc aerators are sequentially arranged along the fluid direction of the outer channel. The first outer channel sludge concentration meter is arranged between the water inlet pipe and the first outer channel rotating disc aerator. The water inlet pipe is provided with a water flow meter. The first outer channel flow pusher, the first outer channel speed meter and the first outer channel dissolved oxygen meter are sequentially arranged along the upstream and downstream direction between the first and second outer channel rotating disc aerators. The second outer channel sludge concentration meter is arranged between the second and third outer channel rotating disc aerators. The second outer channel flow pusher, the second outer channel speed meter and the second outer channel dissolved oxygen meter are sequentially arranged along the upstream and downstream direction between the third and fourth outer channel rotating disc aerators.

[0012] The middle channel aeration and data acquisition unit comprises first to fourth middle channel rotating disc aerators, first to second middle channel sludge concentration meters, first to second middle channel flow pushers, first to second middle channel speed meters and first to second middle channel dissolved oxygen meters. The first to fourth middle channel rotating disc aerators are sequentially arranged along the fluid direction of the middle channel. The first middle channel sludge concentration meter is arranged upstream of the first middle channel rotating disc aerator. The first middle channel speed meter, the first middle channel dissolved oxygen meter, the first middle channel flow pusher and the second middle channel sludge concentration meter are sequentially arranged along the upstream and downstream direction between the second and third middle channel rotating disc aerators. The second middle channel speed meter, the second middle channel dissolved oxygen meter and the second middle channel flow pusher are sequentially arranged along the upstream and downstream direction between the fourth middle channel rotating disc aerator and the first middle channel sludge concentration meter.

[0013] The inner channel aeration and data acquisition unit comprises first to fourth inner channel rotating disc aerators, first to second inner channel sludge concentration meters, first to second inner channel flow pushers, first to second inner channel speed meters and first to second inner channel dissolved oxygen meters. The first to fourth inner channel rotating disc aerators are sequentially arranged along the fluid direction of the inner channel. The first inner channel sludge concentration meter is arranged upstream of the first inner channel rotating disc aerator. The first inner channel speed meter, the first inner channel dissolved oxygen meter, the first inner channel flow pusher and the second inner channel sludge concentration meter are sequentially arranged along the upstream and downstream direction between the second and third inner channel rotating disc aerators. The second inner channel speed meter, the second inner channel dissolved oxygen meter and the second inner channel flow pusher are sequentially arranged along the upstream and downstream direction between the fourth inner channel rotating disc aerator and the first inner channel sludge concentration meter.

[0014] The dissolved oxygen control unit comprises a magnetic suspension fan, an air inlet main pipe and two liftable aeration assemblies. The magnetic suspension fan is connected to the two liftable aeration assemblies through the air inlet main pipe and two electrically controlled butterfly valves. The air inlet main pipe is provided with a gas flow meter. The two liftable aeration assemblies are symmetrically distributed in the Orbal oxidation ditch.

[0015] PLC control unit, with above water inflow meter, gas flow meter, magnetic suspension fan, all rotating disc aerator, all sludge concentration instrument, all pusher, all speed meter, all dissolved oxygen meter and two electric regulating butterfly valve electric connection, to control magnetic suspension fan, all rotating disc aerator, all pusher and two electric regulating butterfly valve through the data obtained from water inflow meter, gas flow meter, all sludge concentration instrument, all speed meter and all dissolved oxygen meter.

[0016] In a preferred embodiment of the utility model, the first outer groove sludge concentration instrument, the first middle groove sludge concentration instrument and the first inner groove sludge concentration instrument are respectively close to the first outer groove rotating disc aerator, the first middle groove rotating disc aerator and the first inner groove rotating disc aerator.

[0017] Further preferably, the first outer groove speed meter, the first middle groove speed meter and the first inner groove speed meter are respectively close to the first outer groove pusher, the second middle groove rotating disc aerator and the second inner groove rotating disc aerator.

[0018] In a preferred embodiment of the utility model, the second outer groove sludge concentration instrument, the second middle groove sludge concentration instrument and the second inner groove sludge concentration instrument are respectively close to the third outer groove rotating disc aerator, the third middle groove rotating disc aerator and the third inner groove rotating disc aerator.

[0019] Further preferably, the second outer groove speed meter, the second middle groove speed meter and the second inner groove speed meter are respectively close to the second outer groove pusher, the fourth middle groove rotating disc aerator and the fourth inner groove rotating disc aerator.

[0020] In a preferred embodiment of the utility model, one of the liftable aeration assemblies is arranged between the first outer groove rotating disc aerator and the first outer groove pusher, between the first middle groove rotating disc aerator and the second middle groove rotating disc aerator and between the first inner groove rotating disc aerator and the second inner groove rotating disc aerator, and another of the liftable aeration assemblies is arranged between the third outer groove rotating disc aerator and the second outer groove pusher, between the third middle groove rotating disc aerator and the fourth middle groove rotating disc aerator and between the third inner groove rotating disc aerator and the fourth inner groove rotating disc aerator.

[0021] Further preferably, the liftable aeration assembly comprises a plurality of evenly arranged aeration mechanisms, each of which has a vertical pipe, a horizontal pipe and a plurality of aeration pipes in sequence, the upper end of the vertical pipe is connected to the air inlet main pipe, the lower end of the vertical pipe is connected to the middle part of the horizontal pipe, and the plurality of aeration pipes are evenly distributed on both sides of the horizontal pipe.

[0022] The utility model has the advantages of:

[0023] 1. This utility model adds a dissolved oxygen control unit, which has the ability to improve the aeration components; by utilizing the advantages of the high oxygenation efficiency and low energy consumption of the dissolved oxygen control unit, and in conjunction with the rotating disc aerator to supplement dissolved oxygen and promote flow, it can not only meet the process's demand for dissolved oxygen, but also save on power consumption.

[0024] 2. This utility model can comprehensively calculate and control the air volume of the magnetic levitation blower and the number of rotating disc aerators activated in the outer and inner ditches by using data from the influent flow meter and online influent detection data via a PLC (Programmable Logic Controller). Based on historical data from online instruments such as the dissolved oxygen meter, sludge concentration meter, and air flow meter in the oxidation ditch, the PLC automatically calculates and corrects parameters at regular intervals, adjusting the air supply of the magnetic levitation blower and the number of rotating disc aerators activated to achieve intelligent aeration.

[0025] 3. Based on the online instrument data of the speed measuring instrument, the PLC can automatically control the number of the outer, middle and inner channel flow promoters to be opened at regular intervals, so as to ensure that the average flow velocity in the oxidation ditch is greater than 0.25 m / s, so as to maintain suitable hydrodynamic conditions. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] Figure 2 This is a three-dimensional structural diagram of the aeration mechanism of the liftable aeration unit of this utility model. Detailed Implementation

[0028] The technical solution of this utility model will be further explained and described below with reference to specific embodiments and accompanying drawings.

[0029] like Figure 1 As shown, an Orbal oxidation ditch aeration system includes: an outer ditch aeration and data acquisition unit 1, a middle ditch aeration and data acquisition unit 2, an inner ditch aeration and data acquisition unit 3, a dissolved oxygen control unit 4, and a PLC control unit (not shown in the figure).

[0030] The outer ditch aeration and data acquisition unit 1 comprises first to fourth outer ditch disc rotating aerators 101-104, first to second outer ditch sludge concentration meters 111-112, first to second outer ditch flow pushers 121-122, first to second outer ditch speed meters 131-132 and first to second outer ditch dissolved oxygen meters 141-142. The first to fourth outer ditch disc rotating aerators 101-104 are arranged in sequence along the fluid direction of the outer ditch from upstream to downstream. The first outer ditch sludge concentration meter 111 is arranged between the water inlet pipe 5 and the first outer ditch disc rotating aerator 101. The water inlet pipe 5 is provided with a water inlet flow meter 50. The first outer ditch flow pusher 121, the first outer ditch speed meter 131 and the first outer ditch dissolved oxygen meter 141 are arranged in sequence along the upstream and downstream direction between the first and second outer ditch disc rotating aerators 101-102. The second outer ditch sludge concentration meter 112 is arranged between the second and third outer ditch disc rotating aerators 102-103. The second outer ditch flow pusher 122, the second outer ditch speed meter 132 and the second outer ditch dissolved oxygen meter 142 are arranged in sequence along the upstream and downstream direction between the third and fourth outer ditch disc rotating aerators 103-104.

[0031] The middle ditch aeration and data acquisition unit 2 comprises first to fourth middle ditch disc rotating aerators 201-204, first to second middle ditch sludge concentration meters 211-212, first to second middle ditch flow pushers 221-222, first to second middle ditch speed meters 231-232 and first to second middle ditch dissolved oxygen meters 241-242. The first to fourth middle ditch disc rotating aerators 201-204 are arranged in sequence along the fluid direction of the middle ditch from upstream to downstream. The first middle ditch sludge concentration meter 211 is arranged upstream of the first middle ditch disc rotating aerator 201. The first middle ditch speed meter 231, the first middle ditch dissolved oxygen meter 241, the first middle ditch flow pusher 221 and the second middle ditch sludge concentration meter 212 are arranged in sequence along the upstream and downstream direction between the second and third middle ditch disc rotating aerators 202-203. The second middle ditch speed meter 232, the second middle ditch dissolved oxygen meter 242 and the second middle ditch flow pusher 222 are arranged in sequence along the upstream and downstream direction between the fourth middle ditch disc rotating aerator 204 and the first middle ditch sludge concentration meter 211.

[0032] The inner-gutter aeration and data acquisition unit 3 comprises first to fourth inner-gutter disc rotating aerators 301-304, first to second inner-gutter sludge concentration meters 311-312, first to second inner-gutter plug flow devices 321-322, first to second inner-gutter velocity meters 331-332 and first to second inner-gutter dissolved oxygen meters 341-342. The first to fourth inner-gutter disc rotating aerators 301-304 are arranged in sequence along the fluid direction from upstream to downstream in the inner-gutter. The first inner-gutter sludge concentration meter 311 is arranged upstream of the first inner-gutter disc rotating aerator 301. The first inner-gutter velocity meter 331, the first inner-gutter dissolved oxygen meter 341, the first inner-gutter plug flow device 321 and the second inner-gutter sludge concentration meter 312 are arranged in sequence along the upstream and downstream direction between the second and third inner-gutter disc rotating aerators 302-303. The second inner-gutter velocity meter 332, the second inner-gutter dissolved oxygen meter 342 and the second inner-gutter plug flow device 322 are arranged in sequence along the upstream and downstream direction between the fourth inner-gutter disc rotating aerator 304 and the first inner-gutter sludge concentration meter 311.

[0033] Preferably, the first outer-gutter sludge concentration meter 111, the first middle-gutter sludge concentration meter 211 and the first inner-gutter sludge concentration meter 311 are respectively close to the first outer-gutter disc rotating aerator 101, the first middle-gutter disc rotating aerator 201 and the first inner-gutter disc rotating aerator 301. The first outer-gutter velocity meter 131, the first middle-gutter velocity meter 231 and the first inner-gutter velocity meter 331 are respectively close to the first outer-gutter plug flow device 121, the second middle-gutter disc rotating aerator 202 and the second inner-gutter disc rotating aerator 302. The second outer-gutter sludge concentration meter 112, the second middle-gutter sludge concentration meter 212 and the second inner-gutter sludge concentration meter 312 are respectively close to the third outer-gutter disc rotating aerator 103, the third middle-gutter disc rotating aerator 203 and the third inner-gutter disc rotating aerator 303. The second outer-gutter velocity meter 132, the second middle-gutter velocity meter 232 and the second inner-gutter velocity meter 332 are respectively close to the second outer-gutter plug flow device 122, the fourth middle-gutter disc rotating aerator 204 and the fourth inner-gutter disc rotating aerator 304.

[0034] The dissolved oxygen control unit 4 comprises a magnetic suspension fan 40, an air inlet main pipe 41 and two elevatable aeration assemblies 42. The magnetic suspension fan 40 is connected to the two elevatable aeration assemblies 42 through the air inlet main pipe 41 and two electrically adjustable butterfly valves 43 in sequence. The air inlet main pipe 41 is provided with a gas flow meter 410. The two elevatable aeration assemblies 42 are symmetrically distributed in the Orbal oxidation ditch.

[0035] One of the liftable aeration assemblies 42 is arranged between the first outer channel disc aerator 101 and the first outer channel pusher 121, between the first middle channel disc aerator 201 and the second middle channel disc aerator 202, and between the first inner channel disc aerator 301 and the second inner channel disc aerator 302; and the other liftable aeration assembly 42 is arranged between the third outer channel disc aerator 303 and the second outer channel pusher 122, between the third middle channel disc aerator 203 and the fourth middle channel disc aerator 204, and between the third inner channel disc aerator 303 and the fourth inner channel disc aerator 304. Figure 2 As shown in the figure, the liftable aeration assembly 42 comprises a plurality of evenly arranged aeration mechanisms 421, each of which has a vertical pipe 4211, a horizontal pipe 4212 and a plurality of aeration pipes 4213 connected in sequence, the upper end of the vertical pipe 4211 is connected to the air inlet main pipe 41, the lower end of the vertical pipe 4211 is connected to the middle part of the horizontal pipe 4212, and the plurality of aeration pipes 4213 are evenly distributed on both sides of the horizontal pipe 4212.

[0036] The utility model discloses can utilize the advantage of the dissolved oxygen this control unit 4 high oxygenation efficiency and low energy consumption, cooperate disc aerator and supplement dissolved oxygen and push flow effect, can meet the demand of process to dissolved oxygen, and can save electric energy consumption.

[0037] The PLC control unit is electrically connected with the above water inlet flowmeter 50, gas flowmeter 410, magnetic suspension fan 40, all disc aerators, all sludge concentration meters, all pushers, all speed meters, all dissolved oxygen meters and two electric regulating butterfly valves, so as to control the magnetic suspension fan, all disc aerators, all pushers and two electric regulating butterfly valves 43 by the data obtained from the water inlet flowmeter 50, gas flowmeter 410, all sludge concentration meters, all speed meters and all dissolved oxygen meters.

[0038] That is, the utility model can control the air volume of the magnetic suspension fan and the opening number of the outer channel and inner channel disc aerators by the data of the water inlet flowmeter 50 and online detection data and the PLC (programmable logic controller) comprehensive calculation. According to the historical data of the oxidation ditch dissolved oxygen meter, sludge concentration meter, gas flowmeter and other online instruments, the PLC automatically calculates and corrects parameters at regular time, adjusts the air supply of the magnetic suspension fan 40 and the opening number of the disc aerator, and realizes the effect of intelligent aeration; and according to the online instrument data of the speed meter, the PLC automatically controls the opening number of the outer channel, middle channel and inner channel pushers at regular time, ensures that the average flow velocity in the oxidation ditch is greater than 0.25 m / s, and maintains the appropriate hydrodynamic conditions.

[0039] The above is only a preferred embodiment of the utility model, and therefore cannot limit the range of the utility model implementation, that is, equivalent changes and modifications made according to the patent range and content of the specification should still be within the scope covered by the utility model.

Claims

1. An Orbal oxidation ditch aeration system characterized by: The utility model relates to an aeration and data acquisition unit of outer ditch, an aeration and data acquisition unit of middle ditch, an aeration and data acquisition unit of inner ditch, a dissolved oxygen control unit and a PLC control unit, The aeration and data acquisition unit of outer ditch includes first to fourth outer ditch disc aeration machines, first to second outer ditch sludge concentration instruments, first to second outer ditch pushers, first to second outer ditch speed meters and first to second outer ditch dissolved oxygen instruments, the first to fourth outer ditch disc aeration machines are sequentially arranged along the fluid direction of the outer ditch, the first outer ditch sludge concentration instrument is arranged between the water inlet pipe and the first outer ditch disc aeration machine, the water inlet pipe is provided with a water inlet flowmeter, the first to second outer ditch pushers, the first to second outer ditch speed meters and the first to second outer ditch dissolved oxygen instruments are sequentially arranged along the upstream and downstream directions between the first and second outer ditch disc aeration machines, the second outer ditch sludge concentration instrument is arranged between the second and third outer ditch disc aeration machines, and the second to fourth outer ditch pushers, the second to fourth outer ditch speed meters and the second to fourth outer ditch dissolved oxygen instruments are sequentially arranged along the upstream and downstream directions between the third and fourth outer ditch disc aeration machines; The aeration and data acquisition unit of middle ditch includes first to fourth middle ditch disc aeration machines, first to second middle ditch sludge concentration instruments, first to second middle ditch pushers, first to second middle ditch speed meters and first to second middle ditch dissolved oxygen instruments, the first to fourth middle ditch disc aeration machines are sequentially arranged along the fluid direction of the middle ditch, the first middle ditch sludge concentration instrument is arranged upstream of the first middle ditch disc aeration machine, the first to second middle ditch pushers, the first to second middle ditch speed meters and the first to second middle ditch dissolved oxygen instruments are sequentially arranged along the upstream and downstream directions between the second and third middle ditch disc aeration machines, and the second to fourth middle ditch pushers, the second to fourth middle ditch speed meters and the second to fourth middle ditch dissolved oxygen instruments are sequentially arranged along the upstream and downstream directions between the fourth middle ditch disc aeration machine and the first middle ditch sludge concentration instrument; The aeration and data acquisition unit of inner ditch includes first to fourth inner ditch disc aeration machines, first to second inner ditch sludge concentration instruments, first to second inner ditch pushers, first to second inner ditch speed meters and first to second inner ditch dissolved oxygen instruments, the first to fourth inner ditch disc aeration machines are sequentially arranged along the fluid direction of the inner ditch, the first inner ditch sludge concentration instrument is arranged upstream of the first inner ditch disc aeration machine, the first to second inner ditch pushers, the first to second inner ditch speed meters and the first to second inner ditch dissolved oxygen instruments are sequentially arranged along the upstream and downstream directions between the second and third inner ditch disc aeration machines, and the second to fourth inner ditch pushers, the second to fourth inner ditch speed meters and the second to fourth inner ditch dissolved oxygen instruments are sequentially arranged along the upstream and downstream directions between the fourth inner ditch disc aeration machine and the first inner ditch sludge concentration instrument; The dissolved oxygen control unit includes a magnetic suspension fan, an air inlet main pipe and two liftable aeration assemblies, the magnetic suspension fan is sequentially connected with the two liftable aeration assemblies through the air inlet main pipe and two electric regulating butterfly valves, the air inlet main pipe is provided with a gas flowmeter, and the two liftable aeration assemblies are symmetrically distributed in the Orbal oxidation ditch. ​ The PLC control unit is electrically connected with the above water inflow meter, gas flow meter, magnetic suspension fan, all rotating disc aerators, all sludge concentration meters, all pushers, all speed meters, all dissolved oxygen meters and the second electrically adjusted butterfly valve, so as to control the magnetic suspension fan, all rotating disc aerators, all pushers and the second electrically adjusted butterfly valve through the data obtained from the water inflow meter, gas flow meter, all sludge concentration meters, all speed meters and all dissolved oxygen meters.

2. An Orbal oxidation ditch aeration system as claimed in claim 1, characterised in that: The first outer groove sludge concentration meter, first middle groove sludge concentration meter and first inner groove sludge concentration meter are respectively close to the first outer groove rotating disc aerator, first middle groove rotating disc aerator and first inner groove rotating disc aerator.

3. An Orbal oxidation ditch aeration system as claimed in claim 2, characterised in that: The first outer groove speed meter, first middle groove speed meter and first inner groove speed meter are respectively close to the first outer groove pusher, second middle groove rotating disc aerator and second inner groove rotating disc aerator.

4. An Orbal oxidation ditch aeration system as claimed in claim 1, wherein: The second outer groove sludge concentration meter, second middle groove sludge concentration meter and second inner groove sludge concentration meter are respectively close to the third outer groove rotating disc aerator, third middle groove rotating disc aerator and third inner groove rotating disc aerator.

5. An Orbal oxidation ditch aeration system as claimed in claim 4 wherein: The second outer groove speed meter, second middle groove speed meter and second inner groove speed meter are respectively close to the second outer groove pusher, fourth middle groove rotating disc aerator and fourth inner groove rotating disc aerator.

6. An Orbal oxidation ditch aeration system as claimed in any one of claims 1 to 5 wherein: One of the liftable aeration assemblies is arranged between the first outer groove rotating disc aerator and the first outer groove pusher, between the first middle groove rotating disc aerator and the second middle groove rotating disc aerator and between the first inner groove rotating disc aerator and the second inner groove rotating disc aerator, and the other of the liftable aeration assemblies is arranged between the third outer groove rotating disc aerator and the second outer groove pusher, between the third middle groove rotating disc aerator and the fourth middle groove rotating disc aerator and between the third inner groove rotating disc aerator and the fourth inner groove rotating disc aerator.

7. An Orbal oxidation ditch aeration system as claimed in claim 6 wherein: The liftable aeration assembly comprises a plurality of uniformly arranged aeration mechanisms, each of which has a vertical pipe, a horizontal pipe and a plurality of aeration pipes which are sequentially communicated, the upper end of the vertical pipe is communicated with the air inlet main pipe, the lower end of the vertical pipe is communicated with the middle part of the horizontal pipe, and the plurality of aeration pipes are uniformly and horizontally distributed on both sides of the horizontal pipe.

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