CN101294906A - Water quality on-line monitoring method and system - Google Patents
Water quality on-line monitoring method and system Download PDFInfo
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- CN101294906A CN101294906A CNA2008100622678A CN200810062267A CN101294906A CN 101294906 A CN101294906 A CN 101294906A CN A2008100622678 A CNA2008100622678 A CN A2008100622678A CN 200810062267 A CN200810062267 A CN 200810062267A CN 101294906 A CN101294906 A CN 101294906A
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Abstract
The invention discloses a water quality online monitoring system which comprises a pump, a liquid storing unit, a reacting-detecting unit and a multi-pass direction selecting valve. The multi-pass direction selecting valve is provided with a sample introducing passage, a reagent passage, an analytical passage and a common passage communicating with the liquid storing unit; the reacting-detecting unit is composed of a light source, a reacting-detecting chamber, a detector and an analytical device; one end of the reacting-detecting chamber communicates with the analytical passage, and the other end is connected with a valve. The invention further discloses a water quality online detecting method. The monitoring system has the advantages of simple structure, high measurement accuracy and high response speed. Furthermore, the system can measure a plurality of parameters in a water sample, and can be widely applied to the online monitoring of water quality of various water sources, such as domestic sewage, industrial sewage, stream water, river water, etc.
Description
Technical field
The present invention relates to water analysis, particularly a kind of on-line water quality monitoring method and system.
Background technology
In the wet chemical analysis method of the ammonia nitrogen of national Specification and chemical oxygen demand (COD), all need in sample, to add a certain amount of number of chemical reagent and react, and then carry out quantitative measurement by methods such as volumetric method or spectrophotometric method.
As shown in Figure 1, a kind of monitoring water quality on line system that Italy Systea company produces, detected water sample, all ingredients, mark liquid, zero liquid are communicated with peristaltic pump by valve respectively, and peristaltic pump coupled reaction chamber, measuring chamber successively, the end connection external world of measuring chamber.The light that light source sends is received by detecting device after passing the interior mixing material of measuring chamber, and send the analytic unit analysis, thereby obtains the parameter of detected water sample, and as COD (chemical oxygen demand (COD)), and the waste liquid after measuring is discharged in measuring chamber.
Above-mentioned monitoring water quality on line system has many deficiencies:
1, the quantitative and extraction of sample and chemical reagent all is to finish by the switch of a plurality of solenoid valves and the absorption of peristaltic pump.Each reagent all needs a solenoid valve to control, thereby makes in the reaction reagent kind more for a long time, and it is very complicated that the connection of stream and switching controls seem, is difficult to realize that multiple monitoring index carries out on same instrument, causes the expanded function deficiency.
2, complex structure has used a plurality of solenoid valves that are connected with each reagent respectively, and reaction between detected water sample and reagent and measurement place in two devices to be carried out.
3, owing to the existence of solenoid valve and the inner dead volume of interface unit, all ingredients is residual in stream easily, meeting phase mutual interference between twice measurement before and after causing; And when stream switches, be very easy to cause cross pollution between the different reagent, thereby reduced measuring accuracy.
4, in the course of the work, all ingredients and sample all will pass through described peristaltic pump, therefore can remain in the peristaltic pump; And these residual reagent and sample can corrode described peristaltic pump, reduce the serviceable life of pump, have improved the measurement cost.
5, the response time long, as in the monitoring water during COD, reaction chamber is to be communicated with the external world, the pressure in the reaction chamber is with extraneous identical, all ingredients need experience the long period and could fully react in reaction chamber with this understanding.Abundant mixing between water sample and reagent also needs the long period.
Summary of the invention
In order to solve above-mentioned deficiency of the prior art, the invention provides a kind of measuring accuracy height, response speed height, measure the low on-line water quality monitoring method of cost, also provide a kind of measuring accuracy height, expanded function is strong, response speed is high, measure cost monitoring water quality on line system low, simple in structure.
For achieving the above object, the present invention is by the following technical solutions:
A kind of on-line water quality monitoring method may further comprise the steps:
A, hyperchannel selection valve are selected sample intake passage and reagent passage respectively, and pump extracts quantitative water sample and reagent respectively by the public passage of hyperchannel selection valve in the liquid storage unit;
B, open and be connected first valve that reaction-sensing chamber is communicated with air end, the hyperchannel selection valve is selected analysis channel, and pump is pushed into described water sample and reagent in described reaction-sensing chamber by described public passage;
React between c, water sample and reagent;
D, measuring light are passed the reaction product in reaction-sensing chamber, and are received;
E, analyze received signal, thereby obtain the parameter of water sample.
As preferably, in described step b, also need open second valve that is arranged between reaction-sensing chamber and the analysis channel; In described step c, also need close described second valve.
As preferably, described monitoring method also comprises the following steps that are arranged between step b, the c:
M, described pump are pushed into air in described reaction-sensing chamber by described public passage, described pneumatic blending water sample and the reagent in reaction-sensing chamber, make water sample and reagent mix.
As preferably, in described step a, b, described reagent is to measure needed part reagent, and described monitoring method also comprises the following steps that are arranged between step m, the c:
N1, hyperchannel selection valve selective reagent passage, pump extracts other quantitative reagent by described public passage in the liquid storage unit;
The hyperchannel selection valve is selected analysis channel, and pump is pushed into described other reagent in reaction-sensing chamber by described public passage.
As preferably, described monitoring method also comprises the following steps that are arranged between step n1, the c:
N2, described pump are pushed into air in described reaction-sensing chamber by described public passage, described pneumatic blending water sample and the reagent in reaction-sensing chamber, make water sample and reagent mix;
As preferably, in described step m, after described water sample and the part reagent mix, measuring light is received after passing potpourri in reaction-sensing chamber, obtains first signal;
In described step e, the signal that handle first signal, in steps d, obtains, thus obtain the parameter of water sample.
As preferably, the extraction mode of described air is: the hyperchannel selection valve is selected air duct, and pump extracts the air of certain volume in the liquid storage unit by the public passage of hyperchannel selection valve.
As preferably, among the described step a, the hyperchannel selection valve is selected air duct, sample intake passage and reagent passage respectively, and the public passage of pump by the hyperchannel selection valve be extracting air, quantitative water sample and reagent in the liquid storage unit respectively.
In order to implement said method, the invention allows for a kind of like this monitoring water quality on line system, comprise pump, liquid storage unit and reaction-detecting unit; Described monitoring system also comprises the hyperchannel selection valve, has the public passage of the described liquid storage of sample intake passage, reagent passage, analysis channel and connection unit on the described hyperchannel selection valve; Described reaction-detecting unit comprises light source, reaction-sensing chamber, detecting device and analytical equipment; One end of described reaction-sensing chamber is communicated with described analysis channel, and the other end connects first valve.
As preferably, second valve is installed between described reaction-sensing chamber and the described analysis channel.
As preferably, on the described hyperchannel selection valve air duct is set.
As preferably, described monitoring system also comprises the T-valve that connects described pump, liquid storage unit respectively, and air duct is set on the T-valve.
As preferably, in described reaction-sensing chamber heating arrangement is installed.
As preferably, described pump is syringe pump or ram pump.
As preferably, described liquid storage unit is the liquid storage ring.
Ultimate principle of the present invention is: when measuring, select respective channel such as water sample, all ingredients by the hyperchannel selection valve, extract corresponding volume respectively in the liquid storage unit, be pushed into reaction-sensing chamber by pump again; Again the air in the liquid storage unit is pushed into reaction detection chamber (pneumatic blending water sample and reagent, both are fully mixed); Water sample and reagent carry out reagent mix, reaction and Photoelectric Detection successively in reaction-sensing chamber, also can close the valve that is arranged on reaction-sensing chamber's one end in course of reaction, the pressure that increases progressively in the reaction-sensing chamber has improved reaction velocity, thereby has reduced the response time of monitoring system.
Compared with prior art, the present invention has following beneficial effect:
1, native system adopts the hyperchannel selection valve of no dead volume to come selector channel, can easy, promptly realize the selection and the switching of chemical reagent, can be on same monitoring system a plurality of parameters of analysis water-like, as ammonia nitrogen (NH
3-N), chemical oxygen demand (COD) (COD
Cr), remedied the deficiency of existing monitoring system extendability difference.
2, simple in structure, use the hyperchannel selection valve, replaced a plurality of solenoid valves; Reagent mix, condition chemical reaction and three of Photoelectric Detection can be worked in reaction-sensing chamber and carry out.
3, the hyperchannel selection valve of Cai Yonging has solved because the dead volume problem that solenoid valve and interface unit etc. cause has been avoided the cross pollution between all ingredients, the phase mutual interference between the measurement; The pump that uses can both extract reagent, the water sample of accurate volume, and above-mentioned measure all helps to improve measuring accuracy.
4, in the course of the work, pump can extract the reagent of accurate volume, has reduced the use amount of reagent, has reduced the measurement cost.
5, the response time is short, by closing the valve that is installed in reaction-sensing chamber's one end, make under the environment that is reflected at a sealing between water sample, reagent and carry out, as when the measure CO D, the pressure that increases progressively in this enclosed environment has improved reaction velocity, thereby has shortened Measuring Time greatly.The use air removes water sample and (part) reagent in stirring reaction-sensing chamber, makes between water sample and (part) reagent and fully mixes, and has shortened the reaction time.
Description of drawings
Fig. 1 is the structural representation of COD on-line monitoring system in a kind of existing water;
Fig. 2 is the structural representation of monitoring water quality on line system in the embodiment of the invention 1;
Fig. 3 is the structural representation of monitoring water quality on line system in the embodiment of the invention 2;
Fig. 4 is the structural representation of monitoring water quality on line system in the embodiment of the invention 3.
Embodiment
Below in conjunction with drawings and Examples, the present invention is done further detailed description.
Embodiment 1:
As shown in Figure 2, a kind of monitoring water quality on line system is used for measuring ammonia nitrogen, the COD of water sample, and described monitoring system comprises syringe pump 1, liquid storage ring 3, hyperchannel selection valve 4, reaction-detecting unit.
One end of described syringe pump 1 is communicated with described liquid storage ring 3, and the volume of liquid storage ring 3 is greater than the volume of syringe pump 1.
Described hyperchannel selection valve 4 has sample intake passage, the reagent passage that connects all ingredients, air duct d, analysis channel o, is communicated with the public passage of described liquid storage ring 3, connects the demarcation passage and the waste discharge passage f that demarcate liquid.Described reagent comprises measures catalyzer and the oxygenant that screener that ammonia nitrogen uses and developer, measure CO D use, and demarcating liquid is ammonia nitrogen mark liquid, COD mark liquid, ammonia nitrogen and COD zero liquid.
Described reaction-detecting unit comprises light source 5, reaction-sensing chamber 6, heating arrangement, detecting device 7 and analytical equipment.One end of described reaction-sensing chamber 6 is communicated with described analysis channel o, and the other end connects first valve 10, and present embodiment adopts high pressure resistant solenoid valve.Described heating arrangement is arranged on the electrical heating wire in reaction-sensing chamber 6.
Present embodiment has also disclosed a kind of on-line water quality monitoring method, may further comprise the steps:
A, hyperchannel selection valve 4 are selected air duct d, sample intake passage e and reagent passage g, h, extracted the water sample of the air of certain volume, accurate volume and measure the reagent (potassium sodium tartrate solution, nessler reagent) that ammonia nitrogen is used in liquid storage ring 3 by this passage d by syringe pump 1 then;
B, open first solenoid valve 10, reagent, detected water sample in the liquid storage ring 3 are pushed in reaction-sensing chamber 6 by analysis channel o by syringe pump 1 then;
M, syringe pump 1 also are pushed into the air in the liquid storage ring 3 in reaction-sensing chamber 6 by analysis channel o, in this process pneumatic blending detected water sample, all ingredients, water sample and reagent are fully mixed;
C, close described first solenoid valve 10, detected water sample and reagent is fully reaction in reaction-sensing chamber 6;
The light that d, light source 5 send passes the reaction product in reaction-sensing chamber 6, is received by detecting device 7 afterwards;
E, received signal be device analysis by analysis, thereby obtains the ammonia nitrogen concentration in the water sample;
F, open first solenoid valve 10, hyperchannel selection valve 4 is selected analysis channel o, then by syringe pump 1 will react-sensing chamber's 6 interior reaction product extract to liquid storage ring 3 again from analysis channel o;
G, hyperchannel selection valve 4 are selected waste discharge passage f, by syringe pump 1 reaction product in the liquid storage ring 3 are discharged from waste discharge passage f, waste discharge pipeline 9 then.
Present embodiment has also disclosed another kind of on-line water quality monitoring method, may further comprise the steps:
A, hyperchannel selection valve 4 are selected sample intake passage e and reagent passage n, m respectively, in liquid storage ring 3, extract the detected water sample of accurate volume, the reagent that measure CO D uses (mercuric sulfate, potassium bichromate solution, silver sulfate, sulfuric acid solution) by syringe pump 1 by above-mentioned passage then;
B, hyperchannel selection valve 4 are selected analysis channel o, open first solenoid valve 10, detected water sample, all ingredients in the liquid storage ring 3 are pushed in reaction-sensing chamber 6 by this passage o by syringe pump 3 then;
M, hyperchannel selection valve 4 are selected air duct d, and syringe pump 1 extracts the air of certain volume in liquid storage ring 3 by this passage d;
Hyperchannel selection valve 4 is selected analysis channel o, the air in the liquid storage ring 3 are pushed in reaction-sensing chamber 6 by this passage o by syringe pump 1 then, pneumatic blending detected water sample, reagent, water sample and reagent are fully mixed;
C, close described first solenoid valve 10, make reaction-sensing chamber 6 become the environment of sealing, add biased sample in thermal response-sensing chamber 6 by heating wire, proceed to terminal point until sample and reagent reacting, the pressure that increases progressively in this enclosed environment has improved reaction velocity, thereby has reduced the response time that monitoring system is measured;
The light that d, light source 5 send passes the reaction product in reaction-sensing chamber 6, is received by detecting device 7 afterwards;
E, received signal be device analysis by analysis, thereby obtains the COD in the detected water sample;
F, open first solenoid valve 10, hyperchannel selection valve 4 is selected analysis channel o, then by syringe pump 1 will react-sensing chamber's 6 interior reaction product extract to liquid storage ring 3 again by this passage o;
G, hyperchannel selection valve 4 are selected waste discharge passage f, by syringe pump 1 reaction product in the liquid storage ring 3 are discharged by this passage f, waste discharge pipeline 9 then.
After above-mentioned monitoring system was used a period of time, the demarcation that need measure ammonia nitrogen to monitoring system may further comprise the steps:
1, hyperchannel selection valve 4 is selected to demarcate passage i or is demarcated passage j, extracts quantitative ammonia nitrogen mark liquid or ammonia nitrogen zero liquid by syringe pump 1 by this passage in liquid storage ring 3;
2, hyperchannel selection valve 4 selective reagent passage g, h extract quantitative survey ammonia nitrogen reagent by syringe pump 1 by this passage in liquid storage ring 3;
3, open first solenoid valve 10, hyperchannel selection valve 4 is selected analysis channel o, the mark liquid of the ammonia nitrogens in the liquid storage ring 3 or zero liquid, reagent is pushed in reaction-sensing chamber 6 by this passage o by syringe pump 1 then;
4, hyperchannel selection valve 4 is selected air duct d, is extracted the air of certain volume then in liquid storage ring 3 by this passage d by syringe pump 1;
Hyperchannel selection valve 4 is selected analysis channel o, the air in the liquid storage ring 3 are pushed in reaction-sensing chamber 6 by this passage o by syringe pump 1 then,, pneumatic blending mark liquid or zero liquid, reagent, mark liquid or zero liquid, reagent are fully mixed;
5, for the demarcation of ammonia nitrogen: ammonia nitrogen mark liquid or zero liquid, reagent fully react described reaction-sensing chamber 6 in;
6, the light that sends of light source 5 passes the reaction product in reaction-sensing chamber 6, is received by detecting device 7 afterwards, system is measured the demarcation of ammonia nitrogen;
7, hyperchannel selection valve 4 is selected analysis channel o, then by syringe pump 1 will react-sensing chamber's 6 interior reaction product extract to liquid storage ring 3 again by analysis channel o;
8, hyperchannel selection valve 4 is selected waste discharge passage f, by syringe pump 1 reaction product in the liquid storage ring 3 is discharged by waste discharge passage f, waste discharge pipeline 9 then.
After above-mentioned monitoring system is used a period of time, need carry out the demarcation of measure CO D to monitoring system, different with above-mentioned ammonia nitrogen demarcation is:
What 1, extract in each step is the reagent of COD mark liquid or zero liquid, measure CO D.
2, the reactions steps 5 between the reagent of COD mark liquid or zero liquid, measure CO D is: close described first solenoid valve 10, make reaction-sensing chamber 6 become the environment of sealing, add potpourri in thermal response-sensing chamber 6 by heating wire, proceed to terminal point until marking liquid or zero liquid and reagent reacting, the pressure that increases progressively in this enclosed environment has improved reaction velocity, thereby has improved the demarcation speed of monitoring system.
Embodiment 2:
As shown in Figure 3, a kind of monitoring water quality on line system is used for measuring ammonia nitrogen, the COD of water sample, as different from Example 1:
1, high voltage bearing second solenoid valve 11 is installed between described reaction-sensing chamber 6 and analysis channel o.
2, use ram pump 2 to replace syringe pump 1.
3, in described reaction-sensing chamber 6, microwave heating equipment is set, substitutes former electric heater unit.
Present embodiment has also disclosed a kind of on-line water quality monitoring method, may further comprise the steps:
A, hyperchannel selection valve 4 are selected sample intake passage e and reagent passage n respectively, extract the detected water sample of accurate volume, the part reagent that measure CO D uses (mercuric sulfate, potassium bichromate solution) by ram pump 2 by above-mentioned passage in liquid storage ring 3 then;
B, hyperchannel selection valve 4 are selected analysis channel o, open first solenoid valve 10, second solenoid valve 11, detected water sample, part reagent in the liquid storage ring 3 are pushed in reaction-sensing chamber 6 by this passage o by ram pump 2 then;
M, hyperchannel selection valve are selected air duct d, and ram pump 2 extracts the air of certain volume in liquid storage ring 3 by described public passage;
Hyperchannel selection valve 4 is selected analysis channel o, and ram pump 2 is pushed into described air in reaction-sensing chamber 6 by described public passage; Described pneumatic blending described water sample and part reagent (mercuric sulfate, potassium bichromate solution), water sample and part reagent are fully mixed;
N1, hyperchannel selection valve 4 selective reagent passage m, ram pump 2 extracts other quantitative reagent (silver sulfate, sulfuric acid solution) by described public passage in liquid storage ring 3;
Hyperchannel selection valve 4 is selected analysis channel o, and ram pump 2 is pushed into described other reagent in reaction-sensing chamber 6 by described public passage;
N2, hyperchannel selection valve 4 are selected air duct d, are extracted the air of certain volume then in liquid storage ring 3 by this passage d by ram pump 2;
Hyperchannel selection valve 4 is selected analysis channel o, the air in the liquid storage ring 3 are pushed in reaction-sensing chamber 6 by this passage o by ram pump 2 then, pneumatic blending detected water sample, all ingredients, water sample and reagent are fully mixed;
C, close described second solenoid valve 11, first solenoid valve 10 successively, make reaction-sensing chamber 6 become the environment of sealing, by the biased sample in the microwave heating reaction-sensing chamber 6, reaction until between water sample and reagent proceeds to terminal point, the pressure that increases progressively in this enclosed environment has improved reaction velocity, thereby has reduced the response time that monitoring system is measured;
The light that d, light source 5 send passes the reaction product in reaction-sensing chamber 6, is received by detecting device 7 afterwards;
E, received signal be device analysis by analysis, thereby obtains the COD in the detected water sample;
F, open first solenoid valve 10, second solenoid valve 11 successively, hyperchannel selection valve 4 is selected analysis channel o, then by ram pump 2 by this passage o will react-sensing chamber's 6 interior reaction product extract again to liquid storage ring 3;
G, hyperchannel selection valve 4 are selected waste discharge passage f, by ram pump 2 reaction product in the liquid storage ring 3 are discharged by this passage f, waste discharge pipeline 9 then.
Present embodiment has also disclosed another on-line water quality monitoring method, may further comprise the steps:
A, hyperchannel selection valve 4 are selected sample intake passage e and reagent passage g respectively, extract the detected water sample of accurate volume, the part reagent (potassium sodium tartrate solution) that the measurement ammonia nitrogen is used by ram pump 2 respectively by above-mentioned passage in liquid storage ring 3 then;
B, hyperchannel selection valve 4 are selected analysis channel o, open first solenoid valve 10, second solenoid valve 11, detected water sample, part reagent in the liquid storage ring 3 are pushed in reaction-sensing chamber 6 by this passage o by ram pump 2 then;
M, hyperchannel selection valve 4 are selected air duct d, and ram pump 2 extracts the air of certain volume in liquid storage ring 3 by described public passage;
Hyperchannel selection valve 4 is selected analysis channel o, and ram pump 2 is pushed into described air in reaction-sensing chamber 6 by described public passage; Described pneumatic blending described water sample and part reagent (potassium sodium tartrate solution), water sample and part reagent are fully mixed;
The light that light source 5 sends passes the potpourri in reaction-sensing chamber 6, is received by detecting device 7 afterwards, thereby obtains first absorbance;
N1, hyperchannel selection valve 4 selective reagent passage h, ram pump 2 extracts quantitative other reagent (nessler reagent) by described public passage in liquid storage ring 3;
Hyperchannel selection valve 4 is selected analysis channel o, and ram pump 2 is pushed into described other reagent in reaction-sensing chamber 6 by described public passage;
N2, hyperchannel selection valve 4 are selected air duct d, are extracted the air of certain volume then in liquid storage ring 3 by this passage d by ram pump 2;
Hyperchannel selection valve 4 is selected analysis channel o, the air in the liquid storage ring 3 are pushed in reaction-sensing chamber 6 by this passage o by ram pump 2 then, pneumatic blending detected water sample, all ingredients, water sample and reagent are fully mixed;
C, close described second solenoid valve 11, first solenoid valve 10 successively, the reaction of environment until between water sample and reagent that makes reaction-sensing chamber 6 become sealing proceeds to terminal point;
The light that d, light source 5 send passes the reaction product through fully reacting in reaction-sensing chamber 6, is received by detecting device 7 afterwards, obtains second absorbance;
E, analytical equipment are handled described first, second absorbance, obtain the ammonia nitrogen concentration in the detected water sample;
F, open first solenoid valve 10, second solenoid valve 11 successively, hyperchannel selection valve 4 is selected analysis channel o, then by ram pump 2 by this passage o will react-sensing chamber's 6 interior reaction product extract again to liquid storage ring 3;
G, hyperchannel selection valve 4 are selected waste discharge passage f, by ram pump 2 reaction product in the liquid storage ring 3 are discharged by this passage f, waste discharge pipeline 9 then.
Embodiment 3:
As shown in Figure 4, a kind of monitoring water quality on line system is used for measuring ammonia nitrogen, the COD of water sample, as different from Example 2:
1, on the hyperchannel selection valve 4 air duct is set no longer.
2, an end of ram pump 2 connects T-valve 15, and a path 12 of T-valve 15 is communicated with extraneous, as air duct; One end of described liquid storage ring 3 connects described T-valve 15.
Present embodiment has also disclosed a kind of on-line water quality monitoring method, may further comprise the steps:
A, hyperchannel selection valve 4 are selected sample intake passage e and reagent passage n respectively, extract the detected water sample of accurate volume, the part reagent that measure CO D uses (mercuric sulfate, potassium bichromate solution) by ram pump 2 by above-mentioned passage in liquid storage ring 3 then;
B, hyperchannel selection valve 4 are selected analysis channel o, open first solenoid valve 10, second solenoid valve 11, detected water sample, part reagent in the liquid storage ring 3 are pushed in reaction-sensing chamber 6 by this passage o by ram pump 2 then;
M, ram pump 2 extract the air of certain volume by the air duct on the described T-valve 15;
Hyperchannel selection valve 4 is selected analysis channel o, and ram pump 2 is pushed into the air that extracts in reaction-sensing chamber 6 by described public passage; Described pneumatic blending described water sample and part reagent (mercuric sulfate, potassium bichromate solution), water sample and part reagent are fully mixed;
N1, hyperchannel selection valve 4 selective reagent passage m, ram pump 2 extracts other quantitative reagent (silver sulfate, sulfuric acid solution) by described public passage in liquid storage ring 3;
Hyperchannel selection valve 4 is selected analysis channel o, and ram pump 2 is pushed into described other reagent in reaction-sensing chamber 6 by described public passage;
N2, ram pump 2 extract the air of certain volume by the air duct on the described T-valve 15;
Hyperchannel selection valve 4 is selected analysis channel o, the air that extracts is pushed in reaction-sensing chamber 6 by this passage o by ram pump 2 then, pneumatic blending detected water sample, all ingredients, water sample and reagent are fully mixed;
C, close described second solenoid valve 11, first solenoid valve 10 successively, make reaction-sensing chamber 6 become the environment of sealing, by the biased sample in the microwave heating reaction-sensing chamber 6, reaction until between water sample and reagent proceeds to terminal point, the pressure that increases progressively in this enclosed environment has improved reaction velocity, thereby has reduced the response time that monitoring system is measured;
The light that d, light source 5 send passes the reaction product in reaction-sensing chamber 6, is received by detecting device 7 afterwards;
E, received signal be device analysis by analysis, thereby obtains the COD in the detected water sample;
F, open first solenoid valve 10, second solenoid valve 11 successively, hyperchannel selection valve 4 is selected analysis channel o, then by ram pump 2 by this passage o will react-sensing chamber's 6 interior reaction product extract again to liquid storage ring 3;
G, hyperchannel selection valve 4 are selected waste discharge passage f, by ram pump 2 reaction product in the liquid storage ring 3 are discharged by this passage f, waste discharge pipeline 9 then.
Present embodiment has also disclosed another on-line water quality monitoring method, may further comprise the steps:
A, hyperchannel selection valve 4 are selected sample intake passage e and reagent passage g respectively, extract the detected water sample of accurate volume, the part reagent (potassium sodium tartrate solution) that the measurement ammonia nitrogen is used by ram pump 2 respectively by above-mentioned passage in liquid storage ring 3 then;
B, hyperchannel selection valve 4 are selected analysis channel o, open first solenoid valve 10, second solenoid valve 11, detected water sample, part reagent in the liquid storage ring 3 are pushed in reaction-sensing chamber 6 by this passage o by ram pump 2 then;
M, ram pump 2 extract the air of certain volume by the air duct on the described T-valve 15;
Hyperchannel selection valve 4 is selected analysis channel o, and ram pump 2 is pushed into the air that extracts in reaction-sensing chamber 6 by described public passage; Described pneumatic blending described water sample and part reagent (potassium sodium tartrate solution), water sample and part reagent are fully mixed;
The light that light source 5 sends passes the potpourri in reaction-sensing chamber 6, is received by detecting device 7 afterwards, thereby obtains first absorbance;
N1, hyperchannel selection valve 4 selective reagent passage h, ram pump 2 extracts quantitative other reagent (nessler reagent) by described public passage in liquid storage ring 3;
Hyperchannel selection valve 4 is selected analysis channel o, and ram pump 2 is pushed into described other reagent in reaction-sensing chamber 6 by described public passage;
N2, ram pump 2 extract the air of certain volume by the air duct on the described T-valve 15;
Hyperchannel selection valve 4 is selected analysis channel o, the air that extracts is pushed in reaction-sensing chamber 6 by this passage o by ram pump 2 then, pneumatic blending detected water sample, all ingredients, water sample and reagent are fully mixed;
C, close described second solenoid valve 11, first solenoid valve 10 successively, make reaction-sensing chamber 6 become the environment of sealing, the reaction between water sample and reagent proceeds to terminal point;
The light that d, light source 5 send passes the reaction product through fully reacting in reaction-sensing chamber 6, is received by detecting device 7 afterwards, obtains second absorbance;
E, analytical equipment are handled described first, second absorbance, obtain the ammonia nitrogen concentration in the detected water sample;
F, open first solenoid valve 10, second solenoid valve 11 successively, hyperchannel selection valve 4 is selected analysis channel o, then by ram pump 2 by this passage o will react-sensing chamber's 6 interior reaction product extract again to liquid storage ring 3;
G, hyperchannel selection valve 4 are selected waste discharge passage f, by ram pump 2 reaction product in the liquid storage ring 3 are discharged by this passage f, waste discharge pipeline 9 then.
It is pointed out that above-mentioned embodiment should not be construed as limiting the scope of the invention.Only measure two parameters as the monitoring system among the embodiment, can also go to be implemented in the function of measuring a plurality of parameters on the same monitoring system by increasing the reagent passage number on the hyperchannel selection valve certainly.Under the situation that does not break away from spirit of the present invention, any type of change that the present invention is made all should fall within protection scope of the present invention.
Claims (15)
1, a kind of on-line water quality monitoring method may further comprise the steps:
A, hyperchannel selection valve are selected sample intake passage and reagent passage respectively, and pump extracts quantitative water sample and reagent respectively by the public passage of hyperchannel selection valve in the liquid storage unit;
B, open and be connected first valve that reaction-sensing chamber is communicated with air end, the hyperchannel selection valve is selected analysis channel, and pump is pushed into described water sample and reagent in described reaction-sensing chamber by described public passage;
C, close described first valve, react between water sample and reagent;
D, measuring light are passed the reaction product in reaction-sensing chamber, and are received;
E, analyze received signal, thereby obtain the parameter of water sample.
2, monitoring method according to claim 1 is characterized in that: in described step b, also need open second valve that is arranged between reaction-sensing chamber and the analysis channel; In described step c, also need close described second valve.
3, monitoring method according to claim 1 and 2 is characterized in that: described monitoring method also comprises the following steps that are arranged between step b, the c:
M, described pump are pushed into air in described reaction-sensing chamber by described public passage, described pneumatic blending water sample and the reagent in reaction-sensing chamber, make water sample and reagent mix.
4, monitoring method according to claim 3 is characterized in that: in described step a, b, described reagent is to measure needed part reagent, and described monitoring method also comprises the following steps that are arranged between step m, the c:
N1, hyperchannel selection valve selective reagent passage, pump extracts other quantitative reagent by described public passage in the liquid storage unit;
The hyperchannel selection valve is selected analysis channel, and pump is pushed into described other reagent in reaction-sensing chamber by described public passage.
5, monitoring method according to claim 4 is characterized in that: described monitoring method also comprises the following steps that are arranged between step n1, the c:
N2, described pump are pushed into air in described reaction-sensing chamber by described public passage, described pneumatic blending water sample and the reagent in reaction-sensing chamber, make water sample and reagent mix;
6, according to claim 4 or 5 described monitoring methods, it is characterized in that: in described step m, after described water sample and the part reagent mix, measuring light is received after passing potpourri in reaction-sensing chamber, obtains first signal;
In described step e, the signal that handle first signal, in steps d, obtains, thus obtain the parameter of water sample.
7, according to claim 4 or 5 described monitoring methods, it is characterized in that: the extraction mode of described air is: the hyperchannel selection valve is selected air duct, and pump extracts the air of certain volume in the liquid storage unit by the public passage of hyperchannel selection valve.
8, monitoring method according to claim 3, it is characterized in that: among the described step a, the hyperchannel selection valve is selected air duct, sample intake passage and reagent passage respectively, and the public passage of pump by the hyperchannel selection valve be extracting air, quantitative water sample and reagent in the liquid storage unit respectively.
9, a kind of monitoring water quality on line system comprises pump, liquid storage unit and reaction-detecting unit; It is characterized in that: described monitoring system also comprises the hyperchannel selection valve, has the public passage of the described liquid storage of sample intake passage, reagent passage, analysis channel and connection unit on the described hyperchannel selection valve; Described reaction-detecting unit comprises light source, reaction-sensing chamber, detecting device and analytical equipment, and an end of described reaction-sensing chamber is communicated with described analysis channel, and the other end connects valve.
10, monitoring system according to claim 9 is characterized in that: second valve is installed between described reaction-sensing chamber and described analysis channel.
11, according to claim 9 or 10 described monitoring systems, it is characterized in that: on the described hyperchannel selection valve air duct is set.
12, according to claim 9 or 10 described monitoring systems, it is characterized in that: described monitoring system also comprises the T-valve that connects described pump, liquid storage unit respectively, and air duct is set on the T-valve.
13, according to claim 9 or 10 described monitoring systems, it is characterized in that: described reaction-sensing chamber is provided with heating arrangement.
14, according to claim 9 or 10 arbitrary described monitoring systems, it is characterized in that: described pump is syringe pump or ram pump.
15, according to claim 9 or 10 arbitrary described monitoring systems, it is characterized in that: described liquid storage unit is the liquid storage ring.
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