CN206020212U - A kind of BOD online auto monitoring systems - Google Patents

Abstract

The utility model discloses a kind of BOD online auto monitoring systems, the system includes：Nutritive salt and strain proportioning device, quantitative mixed aeration device, distributor, culture apparatuses, data acquisition unit；Said apparatus are sequentially connected and connect.Process step is accomplished full-automatic realization by this utility model, substantially reduce the number the working strength of experimenter；The quantity of test daily in sample bottle quantity is enough 7 days, the replacement cycle of sample bottle is one week, reduces maintenance；Strain is stored in 4 DEG C of environment, continuous use, increased collimation while reducing workload；And the detection time of on-line system is not limited by other factors.

Description

A kind of BOD online auto monitoring systems

Technical field

This utility model is related to water analysis technical field, is more particularly to a kind of BOD online auto monitoring systems.

Background technology

BOD (Biochemical oxygen demand) can reflect sewage by the degree of Organic Pollution, and in sewage, contained Organic substance is more, then disappear Oxygen consumption is also more, and BOD numerical value is also higher, and vice versa.Therefore it is one of of paramount importance parameter in sewage quality index. Update not in time although determining BOD and taking longer, data, BOD indexs carry comprehensive concentrated expression total amount of organic, Simulation imitates the self-purification of water, therefore it is difficult to be replaced with other indexs.

Pressure differential method surveys BOD principles：In closed system, when the microorganism in testing sample carries out aerobic biochemical reaction, In water body, microbes are consumed in water body and dissolved oxygen and release CO₂Gas, by CO₂Absorbent absorbs CO₂, closed system can be made In system, there is difference in pressure value, and this difference is proportional with water body BOD, by detect in closed system in front and back pressure difference value come Conversion BOD values.The mostly Laboratory Instruments of country's BOD detecting instruments, also only have using the Laboratory Instruments that pressure differential method does at present A part, accomplish online temporarily also do not have, the processing procedure for being primarily due to water sample during test b OD is more complicated.Therefore, Need to develop a kind of BOD automatic on-line monitoring systems.

Content of the invention

(1) technical problem to be solved

The technical problems to be solved in the utility model is how online auto monitoring BOD, and it is online certainly to provide a kind of BOD Dynamic monitoring system.

(2) technical scheme

In order to solve above-mentioned technical problem, this utility model provides a kind of BOD (Biochemical oxygen demand) online auto monitoring System, the system include：Nutritive salt and strain proportioning device, quantitative mixed aeration device, distributor, culture apparatuses, data Harvester；Said apparatus are sequentially connected and connect.

Preferably, the nutritive salt and strain proportioning device, two storages of the nutritive salt and strain with underlying stirring Bottle, is stored under 4 DEG C of low temperature, and nutritive salt and strain are extracted by power part, quantitative using liquid metering device, then passes through Power part is pushed into specified location.

Preferably, described liquid metering device includes liquid level tube and liquid level detection device, is furnished with valve in the middle of pipeline, passes through Nutritive salt and strain orientation can be extracted or be released by Vavle switching；Described power part is peristaltic pump or plunger displacement pump.

Preferably, described quantitative mixed aeration device, equipped with liquid level detection device, with sample introduction and air inlet, enters battalion Foster salt and strain hole, aspirating hole and the pumping pump housing.Achievable sample mix with nutritive salt and strain and aeration aerating function.

Preferably, described sample introduction and air inlet are located at the quantitative mixed aeration device lower end, are to use Vavle switching passage The multiplex hole of conversion purposes, opens sample holes control valve passage, extracts sample by the pump housing and enter during sample introduction；Open during aeration into Sample and air inlet control valve passage, make gas flow toward top from below, by control the pump housing extraction speed and the time controlling Aeration rate processed.

Preferably, described distributor is that the arrangement of multiple valves is connected with multiple passages, and individually controls each passage Device, the told device left and right sides is the passage of multiple side-by-side valves arrangement, and during distribution sample, controllable valve body opening and closing order makes Sample enters any valve passage in left and right side, told device lower end with an air inlet controlled by valve, upper end with quantitatively mix Aerator sample introduction and air inlet connection.

Preferably, described culture apparatuses be with pressure transducer, sample feeding pipe, check device sealing culture bottle, on State pressure transducer, sample feeding pipe, check device to be mounted on bottle cap or on bottle；During bottle cap sealing, pressure transducer is read in real time Air pressure in bottle is taken, check device makes malleation is occurred without during sample introduction, maintain air pressure in bottle steady；Inner plug of bottle cover is absorbed with placement The device of the alkali grain of CO2, and sealing function is played when bottle cap is tightened.

Preferably, the pressure sensor data of described each culture bottle of data acquisition unit Real-time Collection, obtains each The pressure value of time is simultaneously converted into the device that BOD values show on a display screen by software.

(3) beneficial effect

In prior art, BOD pre-treatment steps are various, and this utility model is accomplished full-automatic realization by pre-treatment step completely, A large amount of working strengths for reducing experimenter；The quantity of daily test in sample bottle quantity is enough 7 days, can be with when changing sample bottle One Monday changed, and reduced maintenance；Strain is stored in 4 DEG C of environment and preserves, continuous use, increased collimation while reducing Workload；The detection time of on-line system is not limited by other factors.

Description of the drawings

In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment Or accompanying drawing to be used is briefly described needed for description of the prior art, it should be apparent that, drawings in the following description are only It is some embodiments of the present utility model, for those of ordinary skill in the art, in the premise for not paying creative work Under, can be with according to these other accompanying drawings of accompanying drawings acquisition.

Fig. 1 is this utility model BOD online auto monitoring system overall structure diagrams；

Fig. 2 is this utility model BOD online auto monitoring system overall flow schematic diagrams；

Fig. 3 is the process schematic for carrying out BOD analyses using this utility model BOD online auto monitoring systems.

Specific embodiment

With reference to the accompanying drawings and examples embodiment of the present utility model is described in further detail.Following examples For this utility model is described, but can not be used for limiting scope of the present utility model.

This utility model is BOD automatic on-line monitoring systems, by controlling multiple valve bodies and pump housing linkage work, accomplishes The full-automatic sample introduction of BOD samples, reagent adding mix, aeration, a series of actions such as rationed, finally squeeze into culture inspection in culture bottle Survey, and pressure value conversion BOD values are constantly read by pressure transducer, reach the online purposes of BOD, the data of this system Accurately, maintenance is little, simple to operate.

This utility model is further illustrated below with embodiment.Raw materials used in this utility model, part is except as otherwise special Commercial convenient source, part are outside illustrating.

Embodiment 1

Referring to Fig. 1-2, this utility model BOD online auto monitoring systems constitute as follows：Nutritive salt and strain proportioning device, Quantitative mixed aeration device, distributor, culture apparatuses, data acquisition unit；Said apparatus are sequentially connected and connect.Nutritive salt and bacterium Plant proportioning device：Including two storage bottles of the nutritive salt and strain with underlying stirring, preserve under 4 DEG C of low temperature, nutrition With three-way valve in the middle of salt and strain connecting line, pipe passage can be switched to by nutritive salt or strain by switching three-way valve Any one,

Nutritive salt or strain are all extracted by the pump housing, by liquid metering device metered volume, then are pushed into by the pump housing Specified location.Above-mentioned liquid metering device includes liquid level tube and liquid level detection device.Quantitative aerator：It is for water sample body Long-pending is quantitative, and realizes that water sample mixes the device of simultaneously aeration performance with nutritive salt and strain, and water sample is pumped into liquid by the pump housing In the pipe of position, quantitative by liquid level metering device, then squeeze into nutritive salt and strain toward water sample, be evacuated by the pump housing, gas from Lower section up direction aeration, makes water sample, nutritive salt, strain uniformly mix.Distributor：Water sample and nutritive salt and strain mixing After aeration, form normal pressure by the anti-air that pushes away of the pump housing into liquid level tube, water sample can be pushed in distributor, distributor by Multiple electromagnetic valves and multiple passages composition, each passage all individually controls to be opened and closed by electromagnetic valve, each passage and culture bottle phase Even, water sample is allow to reach in the culture bottle being arbitrarily designated by electromagnetism Vavle switching.Culture apparatuses：When sample enters culture bottle, Air in bottle can be discharged by the check device on culture bottle, keep air pressure in bottle to balance with ambient pressure, and check device has There is the characteristic of only export but no import, during sample culturing, negative pressure in bottle, can be produced, check device can prevent gas from entering bottle Interior, the sealing of bottle is maintained, while CO is absorbed with placement in culture bottle₂Alkali grain device, culture bottle is in 20 DEG C of rings Lucifuge culture in border.Data acquisition unit：Pressure transducer real-time detection on culture bottle uploads pressure of the inside of a bottle value, by calculating Software conversion BOD values show on a display screen.

Embodiment 2

Referring to Fig. 3, the process for carrying out BOD analyses using BOD online auto monitoring systems of the present invention is as follows：Testing process is opened Begin, sample introduction process：Valve 14 and valve 4 are switched to opening state, while pump 1 is started working, sample is drawn into liquid through the pump housing 1 In the pipe 2 of position, liquid level is determined eventually through the liquid level detection device beside liquid level tube 2, reach quantitative purpose, be then shut off Pump 1 and valve 14 and valve 4, sample is temporarily stored in liquid level tube 2；Salt adding and plus bacterium process：The passage of switching valve 1 can reach to be taken out The purpose of nutritive salt or strain is taken, the passage of switching valve 2 can be driven into nutritive salt or strain in liquid level tube 2, or Squeeze into from liquid level tube 1 in liquid level tube 2, nutritive salt or strain are extracted into liquid level tube 1, by liquid level detection device by pump 2 After quantitative, strain or nutritive salt is pushed in liquid level tube 2；Mixed aeration process：When water sample and nutritive salt and strain all After being driven in liquid level tube 2, open valve 3 and open pump 1 simultaneously, air is extracted by pump 1, by water sample and nutritive salt and strain Aeration and mix a period of time, being then shut off pump 1 and valve 3 terminates aeration process；Rationed process：The work shape of pump 1 Conversely, blowing toward liquid level tube 2 when state and aeration, in switching valve 5-8 and valve 9-12, valve is opening state, while switching valve 15-18 and valve 20-23 opens situation to coordinate, and biased sample can be allow to reach Arbitrary Samples bottle or blank bottle, Actual measure in push sample into sample bottle according to software regulation order, can by repeat former step flow processs can repeatedly by Sample is repeatedly added in sample bottle, and volume required to reach specified experiment, the valve that opens during switch sampling after the completion of sample-adding is Closed mode, you can start homoisothermal cultivation process；Homoisothermal cultivation process：Put well in culture bottle inner plug and can absorb CO2 Potassium hydroxide pellet, instrument whole interior can control interior environment temperature for 20 DEG C with air-conditioning, and sample is in sample bottle Cultivate 5 days in 20 DEG C of constant temperature, during culture, the mixing speed of bottom needs constant speed and uninterrupted, and sample is produced CO2 by strain consumption, Absorbed by potassium hydroxide pellet, reduce pressure of the inside of a bottle；Detection process, is examined in real time by cultivating the pressure transducer on bottle cap Survey pressure of the inside of a bottle, and be uploaded to computer, software for calculation can converse automatically BOD values and on screen real-time display digit and Figure, data are stored in computer and are available for inquiring about.

Embodiment of above is merely to illustrate this utility model, rather than to restriction of the present utility model.Although with reference to enforcement Example has been described in detail to this utility model, it will be understood by those within the art that, to technology of the present utility model Scheme carries out various combinations, modification or equivalent, without departure from the spirit and scope of technical solutions of the utility model, all should Cover in the middle of right of the present utility model.

Claims (8)

1. a kind of BOD online auto monitoring systems, it is characterised in that the system includes：Nutritive salt and strain proportioning device, quantitatively Mixed aeration device, distributor, culture apparatuses, data acquisition unit；Said apparatus are sequentially connected and connect.

2. BOD online auto monitoring systems according to claim 1, it is characterised in that the nutritive salt and strain are quantitative Device, two storage bottles of the nutritive salt and strain with underlying stirring, is stored under 4 DEG C of low temperature, and nutritive salt and strain are logical Power part extraction is crossed, quantitative using liquid metering device, then specified location is pushed into by power part.

3. BOD online auto monitoring systems according to claim 2, it is characterised in that described liquid metering device bag Liquid level tube and liquid level detection device is included, in the middle of pipeline, is furnished with valve, nutritive salt and strain orientation can be extracted by Vavle switching or be pushed away Go out；Described power part is peristaltic pump or plunger displacement pump.

4. BOD online auto monitoring systems according to claim 1, it is characterised in that described quantitative mixed aeration dress Put, equipped with liquid level detection device, with sample introduction and air inlet, enter nutritive salt and strain hole, aspirating hole and the pumping pump housing.

5. BOD online auto monitoring systems according to claim 4, it is characterised in that described sample introduction and air inlet hole position In the quantitative mixed aeration device lower end, it is the multiplex hole with Vavle switching Channel-shifted purposes, during sample introduction, opens sample holes control Valve passage processed, extracts sample by the pump housing and enters；Sample introduction and air inlet control valve passage is opened during aeration, makes gas past from below Top flowing, by control the pump housing extraction speed and the time controlling aeration rate.

6. BOD online auto monitoring systems according to claim 1, it is characterised in that described distributor is multiple Valve arrangement is connected with multiple passages, and individually controls the device of each passage, and the told device left and right sides is multiple side-by-side valves The passage of arrangement, during distribution sample, controllable valve body opening and closing order makes sample enter any valve passage in left and right side, under told device End carries an air inlet controlled by valve, and upper end is connected with quantitative mixed aeration device sample introduction and air inlet.

7. BOD online auto monitoring systems according to claim 1, it is characterised in that described culture apparatuses are to carry Pressure transducer, sample feeding pipe, the sealing culture bottle of check device, above-mentioned pressure transducer, sample feeding pipe, check device are mounted in bottle cap On upper or bottle；During bottle cap sealing, pressure transducer reads air pressure in bottle in real time, and check device makes just to occur without during sample introduction Pressure, maintains air pressure in bottle steady；Inner plug of bottle cover absorbs CO with placement₂Alkali grain device, and play when bottle cap is tightened Sealing function.

8. BOD online auto monitoring systems according to claim 1, it is characterised in that described data acquisition unit reality When gather the pressure sensor data of each culture bottle, obtain the pressure value of each time and BOD values be converted into by software and exist Show the device of screen display.