CN103207266A - Sediment oxygen demand determination device based on electromagnetic dynamic and using method - Google Patents
Sediment oxygen demand determination device based on electromagnetic dynamic and using method Download PDFInfo
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- CN103207266A CN103207266A CN2013101523187A CN201310152318A CN103207266A CN 103207266 A CN103207266 A CN 103207266A CN 2013101523187 A CN2013101523187 A CN 2013101523187A CN 201310152318 A CN201310152318 A CN 201310152318A CN 103207266 A CN103207266 A CN 103207266A
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Abstract
The invention relates to a sediment oxygen demand (SOD) determination device based on electromagnetic dynamic, and a using method. The SOD determination device comprises a testing room, a dynamic room, a magnetic rotor, a magnetic pole, a motor, a dissolved oxygen probe socket, support fixing interfaces and a storage battery, wherein the testing room is in a cylinder structure with the bottom end opened and the runway-shaped cross section; the dissolved oxygen probe socket is formed on one side of the top of the testing room; the support fixing interfaces are arranged at the two ends of the top of the testing room respectively; the dynamic room is a cylindrical barrel and reversely fixed at the top of the testing room; the motor connected with the magnetic pole is arranged in the dynamic room, and is externally connected with the storage battery by a connecting line; the magnetic rotor is placed in the testing room, and is in magnetic connection with the magnetic pole; a hand-held support is connected and fixed to allow the device to be submerged in water and to be filled with overlying water; the dissolved oxygen probe is inserted and sealed; the device is then fixed at the bottom of the water; overlying water circulation of the testing room is adjusted and controlled; and an SOD is determined. The device is simple in structure, easy to dismount, small and exquisite in size, and convenient to carry, and can effectively determine the SOD under the action of different hydrodynamic forces.
Description
Technical field
The present invention relates to environmental technology field, specifically a kind of portable electromagnetic power bed mud oxygen consumption rate (SOD) determinator and using method, especially can realize under the hydrodynamic condition that the bed mud oxygen consumption rate measures, make that the mensuration of SOD is convenient accurately under the hydrodynamic condition.
Background technology
The oxygen consumption effect of bed mud is an important component part of water body oxygen process such as river, lake, usually with SOD(sediment oxygen demand), namely the bed mud oxygen consumption rate characterizes the oxygen consumption situation of water body bed mud.SOD mainly comprises two parts, and a part is that the oxidized process of the reducing substances in the bed mud and these reducing substanceses are diffused into the chemistry oxygen consumption (CSOD) that overlying water produces; Another part is the biological oxygen consumption (BSOD) that the respiration of the invertabrate that perches on the bed mud top layer and aerobic microbiological produces.There are some researches show that the bed mud oxygen utilization accounts for 40% ~ 50% of the total oxygen utilization of water body, in some tidal rivers, even reach 90%.Therefore, research SOD has great importance for estimating effectively carrying out all of water body background situation and water pollution improvement and recovery project practice.
Domestic and international mensuration for SOD can be divided into laboratory displacement determination method and on-the-spot in-site detecting method two classes at present, but mainly is determined as the master with the laboratory displacement.Its method is normally taken back the bed mud gathered and overlying water the laboratory and is placed in the determinator and carries out, by means of ebullator or mechanical agitation overlying water DO concentration is evenly distributed, (Dissolved Oxygen, SOD is calculated in variation DO) by dissolved oxygen DO in the mensuration certain hour inner pressurd vessel.Though laboratory displacement assay method can be controlled test condition well, and overlying water DO is evenly distributed, but the mensuration of this SOD is subjected to influence of various factors such as DO, pH, temperature, the depth of water, bed mud suspension situation and flow field, be difficult to the mensuration under accurate simulated field environment, the especially hydrodynamic condition.
Though the on-the-spot in-site detecting of SOD is conducive to reduce the water body full-scale condition, how in the implement device DO evenly to distribute be the key issue of the on-the-spot in-site detecting of SOD.Mainly adopt water pump at present and utilize bearing to make motor or waterproof machine transmission blade circulating water body to promote the even distribution of DO, yet bearing easily produces stuck situation in silt suspension process, the problem of rustiness of motor is also inevitable, and the expensive husky problem of card that also exists simultaneously of waterproof machine prevailing price.Although also there is the researcher to use the two-way windmill type lodicule that connects with bearing to be fixed in the device, the flow velocity by river self drives lodicule and rotates, and this motorless kind of drive hour is difficult to use at flow velocity, and the disadvantage of bearing still exists.
Summary of the invention
What the objective of the invention is to provide at the deficiencies in the prior art a kind ofly is suitable for on-the-spot in-site detecting SOD determinator and using method under the hydrodynamic condition, its apparatus structure is simple, be easy to dismounting, volume small and exquisitely is easy to carry, cost of manufacture is low, can effectively realize the bed mud oxygen consumption rate mensuration under the different hydrodynamic effect, greatly reduce testing expense.
The concrete technical scheme that realizes the object of the invention is:
A kind of bed mud oxygen consumption rate determinator based on electromagnetic power, characteristics are that this device comprises test cabinet, power house, magnetic force rotor, magnetic pole, motor, dissolved oxygen meter probe socket, support fixed interface, accumulator, described test cabinet is open bottom end and xsect is the column structure of racetrack, its bottom edge is serrate, test cabinet top one side is provided with dissolved oxygen meter probe socket, and two ends, test cabinet top are respectively equipped with the support fixed interface; Power house is that cylindrical tube is inverted that to be fixed in the test cabinet top be closed state, is provided with the motor that connects magnetic pole in the power house, and motor is by the external accumulator of connecting line; The magnetic force rotor places in the test cabinet of power house bottom and with magnetic pole magnetic force and is connected.
Described motor is fixed in the power house inner top by motor fixed rack.
Variable-frequence governor and switch are housed on the described accumulator.
The using method of above-mentioned bed mud oxygen consumption rate determinator is: at first the support fixed interface of hand-held support by described device is connected and fixed, hand-held support is immersed in device in the water, after treating that overlying water is full of test cabinet fully, insert in the dissolved oxygen meter probe socket dissolved oxygen meter probe and sealing, hand-held support will be installed and be inserted the bottom and fixing then, then regulate and control the overlying water circulation of test cabinet, treat to read and record after several minutes dissolved oxygen meter DO reading to end of test (EOT).
The overlying water circulation control methods of described test cabinet are: the switch of opening accumulator, change the motor speed that is connected with magnetic pole by regulating the variable-frequence governor knob, the slewing rate of control magnetic force rotor is regulated and control the size of overlying water cycle rate in the test cabinet, simulates different hydrodynamisms with this.
The present invention has used the electromagnetic action principle dexterously, the magnetic force rotor that will serve as " blade " with separate as the motor of power resources, solved the motor unfavorable problem of operation under water effectively; Simultaneously since the magnetic force rotor be connected with no axle between the magnetic pole bearing can not appear and get rusty, block situation such as sand.In addition, the serrate of bottom of device design can make device steadily catch bed mud, though The turbulent river crashes its way through or water-bed environment such as many sandstones under also can operate as normal.Bed mud oxygen consumption rate proving installation of the present invention is simple in structure, be easy to dismounting, volume small and exquisitely is easy to carry, cost of manufacture is low, can realize effectively that the bed mud oxygen consumption rate under the different hydrodynamic effect is measured, and also greatly reduces testing expense.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is accumulator structure synoptic diagram of the present invention;
Fig. 4 is the different test modes of DO variation diagrams in time.
Embodiment
Consult Fig. 1, Fig. 2 and Fig. 3, the present invention includes overlying water circulation control methods in connection and fixing and the test cabinet of structure, proving installation of determinator, specific as follows:
(1) structure of determinator: this determinator is made up of test cabinet 1, power house 2, magnetic force rotor 3, magnetic pole 4, motor fixed rack 5, motor 6, dissolved oxygen meter probe socket 7, hand-held support fixed interface 8,12V accumulator 9, variable-frequence governor 10, power switch 11.Test cabinet 1 is the column structure of racetrack for the open bottom end xsect, and bottom edge is zigzag structure; Power house 2 is positioned at the test cabinet top and is in closed state, is the cylindrical tube structure; Be provided with the motor 6 of connection magnetic pole 4 in the power house 2 and be fixed on power house 1 inner top by motor fixed rack 5, magnetic pole 4 is about 3mm apart from power house 2 bottoms; Magnetic force rotor 3 places in the test cabinet 1 of power house 2 belows and is attracted at test cabinet 1 top by the graviational interaction of magnetic pole 4; Test cabinet 1 top is provided with dissolved oxygen meter probe socket 7 away from power house 2 one sides, can insert in the test cabinet 1 for dissolved oxygen meter; Test cabinet 1 two ends are respectively arranged with hand-held support fixed interface 8, can insert the hand-held support; Motors 6 in the power house 2 are by the external 12V accumulator 9 of connecting line, variable-frequence governor 10 be installed on the 12V accumulator 9 after switch also is connected by lead respectively.
(2) connection of proving installation is with fixing: the support fixed interface 8 that at first the hand-held support is inserted the device two ends is connected and fixed, then hand-held support is immersed in device in the water, bubble is overflowed from dissolved oxygen meter probe socket 7, after being full of water in the chamber 1 to be tested the dissolved oxygen meter probe is inserted also sealing in the dissolved oxygen meter probe socket 7, last hand-held support will be installed and be inserted water-bed fixing.
(3) overlying water circulation control methods in the test cabinet: the switch 11 of at first opening 12V accumulator 9, by regulating the rotating speed that variable-frequence governor 10 knobs change the motor 6 that is connected with magnetic pole 4, thereby the slewing rate of control magnetic force rotor 3 is regulated and control the size of overlying water cycle rate in the test cabinet 1, and simulates different hydrodynamisms with this.
In order further to verify the actual test effect of this device, be research object with river course analogue means under the aeration condition, embodiment is that original position SOD measures under the inventive method hydrodynamic condition; Comparative Examples 1 is measured for implementing box cultivation original position SOD; Comparative Examples 2 is measured for SOD under the laboratory is shifted traditional Micropump cycling condition; Water temperature is 14.3 ℃ ~ 14.5 ℃ during test.
Embodiment
The inventive method is measured the SOD under the aeration disturbance hydrodynamism
Test cabinet 1 enclosure material is aluminium alloy, and power house 2 enclosure materials are transparent organic glass.
Hand-held support is connected and fixed by the support fixed interface 8 in the determinator of the present invention, then hand-held support is immersed in the water device, after being full of overlying water fully in the chamber 1 to be tested, insertion has the pen type dissolved oxygen meter probe of making sealing-plug by oneself and makes it sealing in dissolved oxygen meter probe socket 7, and it is water-bed also fixing that hand-held support will be installed insertion then; Open 12V accumulator 9 power switches 11 then, regulate frequency control 10 knobs to desired location according to the flow velocity that the reynolds analogue criterion is calculated, after waiting for 10min, begin to read the dissolved oxygen meter reading, DO data of the every 1min record of preceding 30min, DO data of every 5min record are to the experiment end behind the 30min.
Comparative Examples 1
Box cultivation is measured the SOD under the aeration disturbance hydrodynamism
The hand-held support two ends are inserted in the water with above-mentioned experiment same position apparatus of the present invention to test cabinet and are full of overlying water fully, and insert pen type dissolved oxygen meters probe and sealing at dissolved oxygen meter probe socket 7, will installs then and insert water-bed fixing; Opening entry dissolved oxygen meter reading behind the wait 10min, because no overlying water circulation pattern DO variation is slower, thus DO data of every 5min record, until the experiment end.
Comparative Examples 2
Be shifted traditional Micropump round-robin method of laboratory is measured SOD under the aeration disturbance hydrodynamism
Under identical aeration disturbed conditions, in the same test position, get 2.5 L overlying waters and 1 L bed mud, transport the laboratory back and use for test.At first 0.785 L bed mud is layed in internal diameter 10cm, also flatten gently in the graduated cylinder of high 35cm (mud layer height 10cm), inject overlying water height 25cm gently with siphonage then, insert dissolved oxygen meter probe and sealing, use small-sized peristaltic pump to make the overlying water circulation with the speed of 5mL/s.Begin to read the dissolved oxygen meter reading after leaving standstill 10min, DO data of the every 1min record of preceding 30min, DO data of every 5min record to experiment finishes behind the 30min.
The comparative analysis of above-mentioned three kinds of method SOD measurement results
Consulting Fig. 4, is that DO distributes over time in three kinds of method mensuration processes.As can be seen from Figure, in the box cultivation mensuration process DO reduce very slow, thereby cause measured bed mud oxygen consumption rate and truth that big gap is arranged, mainly be because this method DO in the device that seals contacts insufficient with bed mud.By contrast, the interior DO of test cabinet reduces obviously in apparatus of the present invention and the laboratory displacement Micropump round-robin method, mainly is owing under dynamic circulation overlying water condition DO is fully contacted with bed mud, can reflect the actual oxygen consumption situation under the bed mud hydrodynamic condition.
Subsequently, respectively the inventive method and the laboratory measured oxygen consumption curve of displacement Micropump round-robin method are carried out match, degree of fitting is respectively 0.9853 and 0.9655, can illustrate that accordingly the bed mud oxygen consumption rate of apparatus of the present invention under the aeration disturbed conditions has higher accuracy in measuring.The calculating of SOD can be according to following formula:
SOD---in the formula---bed mud oxygen consumption rate amount, g/m
2D;
Ks------total oxygen consumption rate in the device, mg/Lmin;
V---overlying water volume, L;
A----bed mud area, m
2
SOD
1=(0.2243-0.0003) * 0.10 * 1.44 * 100=3.2256 g/m
2D(the inventive method)
SOD
2=(0.0724-0.0003) * 0.25 * 1.44 * 100=2.5956 g/m
2D(laboratory displacement Micropump round-robin method)
By above three kinds of method of testings more as can be known, the present invention has remarkable advantages in the accuracy of measuring bed mud oxygen consumption rate under the hydrodynamic condition, apparatus of the present invention are simple in structure simultaneously, there is not the husky and problem such as get rusty of motor waterproof and bearing card, and cost of manufacture is low, convenient small and exquisite, be convenient to the on-the-spot in-site detecting of SOD.
Above-mentioned case study on implementation of the present invention is not limitation of the present invention.Under the spirit and scope that do not deviate from inventive concept, variation and advantage that those skilled in the art can expect all are included in the present invention.
Claims (5)
1. bed mud oxygen consumption rate determinator based on electromagnetic power, it is characterized in that this device comprises test cabinet, power house, magnetic force rotor, magnetic pole, motor, dissolved oxygen meter probe socket, support fixed interface and accumulator, described test cabinet is open bottom end and xsect is the column structure of racetrack, its bottom edge is serrate, test cabinet top one side is provided with dissolved oxygen meter probe socket, and two ends, test cabinet top are respectively equipped with the support fixed interface; Power house is that cylindrical tube is inverted that to be fixed in the test cabinet top be closed state, is provided with the motor that connects magnetic pole in the power house, and motor is by the external accumulator of connecting line; The magnetic force rotor places in the test cabinet of power house bottom and with magnetic pole magnetic force and is connected.
2. the bed mud oxygen consumption rate determinator based on electromagnetic power according to claim 1 is characterized in that described motor is fixed in the power house inner top by motor fixed rack.
3. the bed mud oxygen consumption rate determinator based on electromagnetic power according to claim 1 is characterized in that being equipped with on the described accumulator variable-frequence governor and switch.
4. the using method of the described bed mud oxygen consumption rate determinator based on electromagnetic power of a claim 1, it is characterized in that at first the support fixed interface of hand-held support by described device being connected and fixed, hand-held support is immersed in described device in the water, after treating that overlying water is full of test cabinet fully, will dissolved oxygen meter probe insert in the dissolved oxygen meter probe socket and sealing, hand-held support will install and be inserted water-bed and fix then; Then regulate and control the overlying water circulation of test cabinet, wait for and read and record dissolved oxygen meter DO reading after several minutes to end of test (EOT).
5. according to the using method of the described bed mud oxygen consumption rate determinator based on electromagnetic power of claim 2, the overlying water circulation that it is characterized in that described regulation and control test cabinet is specially: the switch of opening accumulator, change the motor speed that is connected with magnetic pole by regulating the variable-frequence governor knob, the slewing rate of control magnetic force rotor is regulated and control the size of overlying water cycle rate in the test cabinet, simulates different hydrodynamisms with this.
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Cited By (5)
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| CN104459082A (en) * | 2014-10-29 | 2015-03-25 | 中国水产科学研究院渔业机械仪器研究所 | Method for testing pond sediment oxygen consumption rate |
| CN106198891A (en) * | 2016-08-25 | 2016-12-07 | 中国水产科学研究院黄海水产研究所 | A kind of zostera marina enclosure ecosystem device in situ |
| CN110031465A (en) * | 2019-04-19 | 2019-07-19 | 中山大学 | A kind of plant roots in situ observation system |
| CN114047228A (en) * | 2021-11-09 | 2022-02-15 | 同济大学 | Device and method for analyzing sediment oxygen-consuming pollutants |
| CN114740066A (en) * | 2022-04-11 | 2022-07-12 | 中山大学 | Sediment oxygen consumption rate measuring device and using method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459082A (en) * | 2014-10-29 | 2015-03-25 | 中国水产科学研究院渔业机械仪器研究所 | Method for testing pond sediment oxygen consumption rate |
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| CN106198891A (en) * | 2016-08-25 | 2016-12-07 | 中国水产科学研究院黄海水产研究所 | A kind of zostera marina enclosure ecosystem device in situ |
| CN106198891B (en) * | 2016-08-25 | 2019-10-08 | 中国水产科学研究院黄海水产研究所 | A kind of sea grass original position enclosure ecosystem device |
| CN110031465A (en) * | 2019-04-19 | 2019-07-19 | 中山大学 | A kind of plant roots in situ observation system |
| CN110031465B (en) * | 2019-04-19 | 2022-02-11 | 中山大学 | Plant root system in-situ observation system |
| CN114047228A (en) * | 2021-11-09 | 2022-02-15 | 同济大学 | Device and method for analyzing sediment oxygen-consuming pollutants |
| CN114047228B (en) * | 2021-11-09 | 2023-08-04 | 同济大学 | Device and method for analyzing oxygen-consuming pollutants of sediment |
| CN114740066A (en) * | 2022-04-11 | 2022-07-12 | 中山大学 | Sediment oxygen consumption rate measuring device and using method thereof |
| CN114740066B (en) * | 2022-04-11 | 2023-10-13 | 中山大学 | Sediment oxygen consumption rate measuring device and application method thereof |
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