CN101271062B - On-line monitoring instrument for measuring COD concentration by ultraviolet light absorption method - Google Patents
On-line monitoring instrument for measuring COD concentration by ultraviolet light absorption method Download PDFInfo
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- CN101271062B CN101271062B CN2008100644732A CN200810064473A CN101271062B CN 101271062 B CN101271062 B CN 101271062B CN 2008100644732 A CN2008100644732 A CN 2008100644732A CN 200810064473 A CN200810064473 A CN 200810064473A CN 101271062 B CN101271062 B CN 101271062B
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Abstract
An on-line monitoring instrument of COD concentration by a UV method relates to a piece of monitoring equipment of the COD concentration and belongs to the field of environment water quality monitoring. The equipment is to solve problems of complicated operation, long response time and production of secondary pollution existing in the prior COD monitoring methods. The invention consists of a light path system, a water way system, a circuit system and an embedded system; the light path system is arranged in the water way system; the light path system is connected with the circuit system; the circuit system is connected with the embedded system; the circuit system amplifies the weak electric signal of the light path system, converts into digital signal and sends to the embedded system; the embedded system analyzes and calculates the received digital signal, saves the result and sends to a display module to display to the user in forms of digits or tables. The on-line monitoring instrument has the advantages of easiness in operation and maintenance, low failure rate, no need of adding chemical reagent, no secondary pollution, short test time, response time generally within 1min and capability of realizing real on-line monitoring.
Description
Technical field
The present invention relates to a kind of equipment of the COD of monitoring concentration, belong to the environmental water quality monitoring field.
Background technology
In water quality monitoring, the monitoring of COD (Chemical Oxygen Demand, chemical oxygen demand (COD)) is one important in the environment monitoring.COD refers to handle waste water with strong oxidizer under certain condition, and the amount of the strong oxidizer that reducing substances consumed in the water, result are converted to the content (in mg/L) of oxygen.COD estimates the important indicator that water body is subjected to the organism pollution level, is the important parameter that the treatment effect of the research of river and industrial waste water and sewage treatment plant is estimated.Its value is more little, illustrates that the situation of water pollution is light more.
The assay method of COD has a variety of, mainly is divided into chemical method and physics method.Potassium dichromate method in the chemical method is proposed by Adeney and Dawson the earliest, improves the method that becomes present application through Muers and Moore.Chemical method is as main measurement means the time, and additive method has also obtained using widely.At present, specified test is potassium dichromate method (GB11914-89) and permanganate method (GB11892-89) in China's environmental monitoring standard, and the former is suitable for analytical industry waste water and sanitary sewage, and the latter is suitable for analyzing underground water and cleaner surface water.
In China, the method for monitoring COD is mainly by artificial sample at present, and as main means, operation is frequent, wastes time and energy with lab analysis, and reagent dosage is big, and has caused serious secondary pollution, is not suitable for the measurement of water sample in batches.Most COD monitoring instrument that China is present also all is based on this chemical method, and the test data time-delay is long, failure rate is high, maintenance is big, experimental cost is high, can't adapt to the requirement of modernized environmental monitoring control.
Summary of the invention
The method complicated operation, response time that the objective of the invention is to solve present monitoring COD be long, secondary pollution problem is arranged, and designed a kind of on-line monitoring instrument of measuring COD concentration by ultraviolet light absorption method.
The present invention is by light path system, water circuit system, Circuits System and embedded system are formed, light path system places water circuit system, light path system links to each other with Circuits System, Circuits System links to each other with embedded system, described light path system comprises motor, excentric sleeve, concentric axle sleeve, first photodiode, second photodiode, the first uviol pipe, the second uviol pipe, low pressure mercury lamp, mounting disc, first bearing pin and second bearing pin, along continuous straight runs is set side by side with excentric sleeve and concentric axle sleeve in the motor, the bottom of excentric sleeve is fixed with the first uviol pipe, the inside of excentric sleeve is provided with non-rotary first bearing pin of stationkeeping, the bottom of first bearing pin vertically is fixed with first photodiode and second photodiode side by side, first photodiode and second photodiode are arranged in the first uviol pipe of sealing, the bottom of axle sleeve is fixed with the second uviol pipe with one heart, the inside of axle sleeve is provided with non-rotary second bearing pin of stationkeeping with one heart, the bottom of second bearing pin is fixed with low pressure mercury lamp, low pressure mercury lamp is arranged in the second uviol pipe of sealing, mounting disc is arranged on the motor bottom, and be positioned at the top of two uviol pipes, first photodiode absorbs the 254nm ultraviolet light, second photodiode absorbs the 546nm visible light, and two photodiodes are all towards low pressure mercury lamp.
Advantage of the present invention is: Operation and Maintenance is simple, failure rate is low, need not add chemical reagent, non-secondary pollution, test duration are short, the response time generally in 1 minute, can realize real on-line monitoring.
Description of drawings
Fig. 1 is a structural representation of the present invention, and Fig. 2 is the structural representation of light path system.
Embodiment
Embodiment one: below in conjunction with Fig. 1, Fig. 2, present embodiment is described, present embodiment is by light path system, water circuit system, Circuits System 3 and embedded system 4 are formed, light path system places water circuit system, light path system links to each other with Circuits System 3, Circuits System 3 links to each other with embedded system 4, described light path system is by motor 1-1, excentric sleeve 1-2, concentric axle sleeve 1-3, the first photodiode 1-4, the second photodiode 1-5, the first uviol pipe 1-6, the second uviol pipe 1-7, low pressure mercury lamp 1-8, mounting disc 1-9, the first bearing pin 1-10 and the second bearing pin 1-11 form, along continuous straight runs is set side by side with excentric sleeve 1-2 and concentric axle sleeve 1-3 in the motor 1-1, the bottom of excentric sleeve 1-2 is fixed with the first uviol pipe 1-6, the inside of excentric sleeve 1-2 is provided with the non-rotary first bearing pin 1-10 of stationkeeping, the bottom of the first bearing pin 1-10 vertically is fixed with the first photodiode 1-4 and the second photodiode 1-5 side by side, the first photodiode 1-4 and the second photodiode 1-5 are arranged in the first uviol pipe 1-6 of sealing, the bottom of axle sleeve 1-3 is fixed with the second uviol pipe 1-7 with one heart, the inside of axle sleeve 1-3 is provided with the non-rotary second bearing pin 1-11 of stationkeeping with one heart, the bottom of the second bearing pin 1-11 is fixed with low pressure mercury lamp 1-8, low pressure mercury lamp 1-8 is arranged in the second uviol pipe 1-7 of sealing, mounting disc 1-9 is arranged on motor 1-1 bottom, and be positioned at the top of two uviol pipes, the first photodiode 1-4 absorbs the 254nm ultraviolet light, the second photodiode 1-5 absorbs the 546nm visible light, and two photodiodes are all towards low pressure mercury lamp 1-8.
3: the first photodiode 1-4 of Circuits System and the second photodiode 1-5 convert light signal to electric signal; Convert faint electric signal to voltage signal through three grades of amplifications with a pre-amplification circuit plate; Single-chip Controlling A/D acquisition module converts voltage signal to digital signal; Serial communication module in the single-chip microcomputer sends to embedded system 4 with data.
Embedded system 4: the digital signal that single-chip microcomputer sends in the serial communication module receiving circuit system 3 in the embedded system 4; Analyze, computing module analyzes and calculates the digital signal that receives, and the result preserved and sends to display module and be shown to the user with the form of numeral or chart.
Principle of work: when carrying out the COD measurement light path system is placed water circuit system, the mounting disc 1-9 frame of light path system is in the upper edge of water circuit system, make the motor 1-1 of light path system be exposed at outside the water circuit system, all the other photographic departments are placed in the water circuit system, the motor 1-1 of light path system drives excentric sleeve 1-2 and axle sleeve 1-3 rotation with one heart, because the axle of excentric sleeve 1-2 is inclined to one side, asymmetric, the first uviol pipe 1-6 and the distance between the second uviol pipe 1-7 that cause excentric sleeve 1-2 and concentric axle sleeve 1-3 to be driven take place to change continuously, water circuit system can guarantee flowing of sewage, exchange, the sewage that ultraviolet light that low pressure mercury lamp 1-8 sends and visible light transmissive flow shines the first photodiode 1-4 and the second photodiode 1-5, because the distance between the first uviol pipe 1-6 and the second uviol pipe 1-7 takes place to change continuously, so the first photodiode 1-4 in the light path system and the second photodiode 1-5 sense ultraviolet light that low pressure mercury lamp 1-8 sends and the distance of visible light also is a continually varying, the first photodiode 1-4 and the second photodiode 1-5 are with the light signal of sensing, through filtering, absorb 254nm ultraviolet light and 546nm visible light respectively, and convert thereof into ultra-weak electronic signal, pass to Circuits System 3, Circuits System 3 passes to embedded system 4 again, realizes measure CO D concentration.
Wherein, the first photodiode 1-4 is used to measure the absorbance of water sample at the 254nm place, and the COD of water sample and ultraviolet light (254nm) absorbance has good correlativity under certain condition, promptly just can calculate the COD value of water sample according to ultraviolet light (254nm) absorbance.But when having muddy thing to disturb in the water sample, can cause the correlativity variation between COD and ultraviolet light (254nm) absorbance, at this moment, can be according to visible light (546nm) absorbance of second photodiode 1-5 measurement, calculate the turbidity of water sample, from COD, deduct the error of bringing of turbidity again, can improve the measuring accuracy of instrument.
Embodiment two: present embodiment is described below in conjunction with Fig. 1, water circuit system of the present invention is by outer water jacket 2-1, middle level water jacket 2-2, internal layer water jacket 2-3, internal layer water jacket blasthole 2-4, water inlet pipe 2-5, water intaking valve 2-6, drainpipe 2-7 and gas outlet 2-8 form, outer water jacket 2-1, middle level water jacket 2-2 is nested successively from outside to inside with internal layer water jacket 2-3, internal layer water jacket 2-3 bottom is provided with internal layer water jacket blasthole 2-4, the end sealing of middle level water jacket 2-2, the lateral wall of middle level water jacket 2-2 is connected with gas outlet 2-8, the bottom of middle level water jacket 2-2 is connected with water inlet pipe 2-5, water inlet pipe 2-5 is provided with water intaking valve 2-6, and the bottom of outer water jacket 2-1 is connected with drainpipe 2-7.
Water circuit system principle of work: when carrying out the water-quality COD detection, open water intaking valve 2-6, allow sewage to be detected enter the water jacket 2-2 of middle level from water inlet pipe 2-5, because middle level water jacket 2-2 end sealing, after being filled with by sewage among the water jacket 2-2 of middle level, under the effect of pressure, sewage enters the internal layer water jacket 2-3 from internal layer water jacket blasthole 2-4, bubble in the water jacket 2-2 water of middle level is discharged by gas outlet 2-8 simultaneously, treat to overflow after sewage among the internal layer water jacket 2-3 is filled with, the top of flowing through middle level water jacket 2-2 sealing enters among the outer water jacket 2-1, flow into again among the drainpipe 2-7 that is communicated with outer water jacket 2-1 bottom, like this, sewage is flowing of not stopping, exchange, exhaust, the sewage that is flowing among the internal layer water jacket 2-3 is source to be measured, low pressure mercury lamp 1-8 is a light source, the first photodiode 1-4 and the second photodiode 1-5 see through sewage and absorb ultraviolet light and the visible light that low pressure mercury lamp 1-8 sends, after filtering, absorb 254nm ultraviolet light and 546nm visible light respectively, and convert thereof into electrical signal transfer to Circuits System 3, carry out follow-up work of treatment by Circuits System 3 and embedded system 4.
Claims (2)
1. the on-line monitoring instrument of a measuring COD concentration by ultraviolet light absorption method, it is by light path system, water circuit system, Circuits System (3) and embedded system (4) are formed, light path system places water circuit system, light path system links to each other with Circuits System (3), Circuits System (3) links to each other with embedded system (4), it is characterized in that described light path system comprises motor (1-1), excentric sleeve (1-2), concentric axle sleeve (1-3), first photodiode (1-4), second photodiode (1-5), the first uviol pipe (1-6), the second uviol pipe (1-7), low pressure mercury lamp (1-8), mounting disc (1-9), first bearing pin (1-10) and second bearing pin (1-11), the interior along continuous straight runs of motor (1-1) is set side by side with excentric sleeve (1-2) and concentric axle sleeve (1-3), the bottom of excentric sleeve (1-2) is fixed with the first uviol pipe (1-6), the inside of excentric sleeve (1-2) is provided with non-rotary first bearing pin of stationkeeping (1-10), the bottom of first bearing pin (1-10) vertically is fixed with first photodiode (1-4) and second photodiode (1-5) side by side, first photodiode (1-4) and second photodiode (1-5) are arranged in the first uviol pipe (1-6) of sealing, the bottom of axle sleeve (1-3) is fixed with the second uviol pipe (1-7) with one heart, the inside of axle sleeve (1-3) is provided with non-rotary second bearing pin of stationkeeping (1-11) with one heart, the bottom of second bearing pin (1-11) is fixed with low pressure mercury lamp (1-8), low pressure mercury lamp (1-8) is arranged in the second uviol pipe (1-7) of sealing, mounting disc (1-9) is arranged on motor (1-1) bottom, and be positioned at the top of two uviol pipes, first photodiode (1-4) absorbs the 254nm ultraviolet light, second photodiode (1-5) absorbs the 546nm visible light, and two photodiodes are all towards low pressure mercury lamp (1-8).
2. the on-line monitoring instrument of a kind of measuring COD concentration by ultraviolet light absorption method according to claim 1, it is characterized in that water circuit system comprises outer water jacket (2-1), middle level water jacket (2-2), internal layer water jacket (2-3), internal layer water jacket blasthole (2-4), water inlet pipe (2-5), water intaking valve (2-6), drainpipe (2-7) and gas outlet (2-8), outer water jacket (2-1), middle level water jacket (2-2) is nested successively from outside to inside with internal layer water jacket (2-3), internal layer water jacket (2-3) bottom is provided with internal layer water jacket blasthole (2-4), the end sealing of middle level water jacket (2-2), the lateral wall of middle level water jacket (2-2) is connected with gas outlet (2-8), the bottom of middle level water jacket (2-2) is connected with water inlet pipe (2-5), water inlet pipe (2-5) is provided with water intaking valve (2-6), and the bottom of outer water jacket (2-1) is connected with drainpipe (2-7).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100644732A CN101271062B (en) | 2008-05-09 | 2008-05-09 | On-line monitoring instrument for measuring COD concentration by ultraviolet light absorption method |
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| CN2008100644732A CN101271062B (en) | 2008-05-09 | 2008-05-09 | On-line monitoring instrument for measuring COD concentration by ultraviolet light absorption method |
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| CN101271062A CN101271062A (en) | 2008-09-24 |
| CN101271062B true CN101271062B (en) | 2010-07-21 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101303293B (en) * | 2008-06-27 | 2010-06-16 | 哈尔滨工业大学 | Apparatus for measuring COD by double-light path ultraviolet light absorption method |
| CN101793820B (en) * | 2009-03-27 | 2013-01-02 | 广州市怡文环境科技股份有限公司 | On-line monitoring method for double module linkage water quality |
| CN105259128A (en) * | 2015-11-12 | 2016-01-20 | 浙江微兰环境科技有限公司 | COD and ammonia nitrogen multiparameter online monitoring device and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101303293A (en) * | 2008-06-27 | 2008-11-12 | 哈尔滨工业大学 | Apparatus for measuring COD by double-light path ultraviolet light absorption method |
| CN101358920A (en) * | 2007-07-31 | 2009-02-04 | 赵铭辉 | Optical instrument for measuring water quality |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101358920A (en) * | 2007-07-31 | 2009-02-04 | 赵铭辉 | Optical instrument for measuring water quality |
| CN101303293A (en) * | 2008-06-27 | 2008-11-12 | 哈尔滨工业大学 | Apparatus for measuring COD by double-light path ultraviolet light absorption method |
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