CN105417610A - Apparatus and method for removing trihalomethane from water - Google Patents
Apparatus and method for removing trihalomethane from water Download PDFInfo
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- CN105417610A CN105417610A CN201511005981.XA CN201511005981A CN105417610A CN 105417610 A CN105417610 A CN 105417610A CN 201511005981 A CN201511005981 A CN 201511005981A CN 105417610 A CN105417610 A CN 105417610A
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- water
- haloform
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/36—Organic compounds containing halogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses an apparatus and a method for removing trihalomethane from water. The apparatus comprises a plurality of aeration devices, a starting device, a detection device and an automatic control system; each of the aeration devices comprises a rain shading cap, an inflator, a floating drum, a sealing drum and an ejector; the starting device comprises an inflation motor and an ejector motor; the detection device comprises a flow meter, a temperature sensor, a residual chlorine detector and a trihalomethane detector; and the automatic control system comprises a PLC controller and a frequency converter. The method comprises the following steps: laying the aeration devices, setting the PLC controller, arranging the detection device, starting the detection device, and controlling the inflation motor according to the concentration of trihalomethane. The apparatus can rapidly and efficiently remove standard exceeding trihalomethane and like pollutants from water, and realizes no need of pipeline laying in the installation process, and chlorine removed by the apparatus is sucked into water and is used to aerate, so reservation of enough free residual chlorine in water is guaranteed.
Description
Technical field
The present invention relates to water-treatment technology field, be specifically related to a kind of device and method removing haloform in water.
Background technology
Tradition water supply plant adopts conventional water treatment process, and its step is " coagulation-precipitation-filtration-sterilization ".Wherein sterilization process is the final step of traditional water supply plant technical process, is the most critical link ensureing effluent water quality biological safety.But in existing sterilization process, can't overcome and produce the problem of disinfection byproduct (DBP), because disinfection byproduct (DBP) has " three causing property ", act on human body easily carcinogenic, teratogenesis and mutagenesis.While strengthening sterilization dynamics, guaranteeing to kill pathogenic microorganism, also increase the amount of disinfection byproduct (DBP), cause the risk of output water chemical safety to increase.So disinfection byproduct (DBP) is the primary study direction of handling technology of water supply always.Haloform be found the earliest, the most well known, the most a kind of disinfection byproduct (DBP) of distributing in tap water.Haloform comprises chloroform, a bromodichloromethane, dibromo monochloro methane and bromofom, is wherein the highest with the frequency of occurrences of chloroform and concentration.In toxicology, haloform has certain pathogenic, and Long contact time can produce the illness of eyes, superficial skin and respiratory system, and haloform also has certain carcinogenic risk in addition.When water supply plant former Organic substance in water concentration is higher and when adopting liquid chlorine to carry out disinfection to water, output water exists the risk that haloform disinfection byproduct (DBP) exceeds standard.Patent 201510282028.3 discloses one and utilizes UV/H
2o
2remove the water treatment method of haloform in tap water, although the method is to the good removal effect of haloform, for laying ultraviolet equipment under water supply plant applied environment and adding hydrogen peroxide medicament, processing cost is high, and there is the problem of hydrogen peroxide residue, be actually and be difficult to carry out.Patent 201010523355.0 discloses aeration stripping method when a kind of tap water burst halogenated alkane type organic pollutes, it is characterized in that the method lays blast aeration system in water, realized the removal of volatility haloalkane hydro carbons organic pollutant by aeration.There is following problem in these class methods: systematic comparison is complicated, needs to arrange blower equipment, lays micro-pore aeration pipeline long construction period, and be not suitable for base closed and lay in the short clean water basin of water stopping time requirement, cost is higher, very flexible.Once the mode of laying is improper in clean water basin, can not control aeration rate preferably, the chlorine in clean water basin is too fast by stripping out, is difficult to realize clean water basin and exceeds standard the emergency processing of haloform.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of device removing haloform in water, this device removes haloform in water by aeration stripping method, pipe laying is not needed during installation, and this device regulates the frequency of inflation motor by robot control system(RCS), the haloform exceeded standard in high efficient aeration stripping water; The sterilizing agents such as stripping chlorine out to be sucked in water aeration again by this device again simultaneously, reach balance, ensure to retain enough free chlorine residuals in water.
For achieving the above object, the present invention adopts following technical scheme: a kind of device removing haloform in water, comprises some aerators, starting outfit, test set and robot control system(RCS);
Each aerator described comprises: shading rain cap, inflator, floating drum, sealing bore and ejector; Described rain cover cap is located at the top of inflator; Described floating drum is arranged on the left and right sides of inflator respectively; Described sealing bore is connected with the lower end of inflator; Described ejector is arranged on the lower end of sealing bore;
Described starting outfit comprises inflation motor and ejector motor; Described inflation motor is connected with inflator; Described ejector motor is connected with ejector;
Described test set comprises: under meter, temperature sensor, residual chlorine detecting instrument and haloform detector;
Described robot control system(RCS) comprises PLC and frequency transformer;
First signal input part of described PLC is connected with the signal output part of under meter;
The second signal input terminus of described PLC is connected with the signal output part of temperature sensor; 3rd signal input part of described PLC is connected with the signal output part of residual chlorine detecting instrument; 4th signal input part of described PLC is connected with the signal output part of haloform detector; First signal output part of described PLC is connected with the signal input part of frequency transformer; The signal output part of described frequency transformer is connected with the signal input part of inflation motor; The second signal output terminal of described PLC is connected with the signal input part of ejector motor.
As the preferred scheme of one of the present invention: the rotating speed of described inflation motor is 500 ~ 3000r/min.
As the preferred scheme of one of the present invention: the aeration quantity of described inflator is 10 ~ 1000m
3/ h.
As the preferred scheme of one of the present invention: the inflation depth of water of described inflator is 2 ~ 6m.
As the preferred scheme of one of the present invention: the rotating speed of described ejector motor is 500 ~ 1500r/min; The microbubble diameter of described release after the cutting of ejector motor is 0.2 ~ 2mm.
Another object of the present invention is to provide a kind of method removing haloform in water, the method by laying the device removing haloform in water in clean water basin, regulate inflation electric machine frequency by PLC intellectuality, reach the effect of the efficient haloform removed in clean water basin.
For achieving the above object, the present invention adopts following technical scheme:
Remove a method for haloform in water, adopt the device removing haloform in water as above, comprise the following steps:
1) by some vertical floating stage casing or the rear ends being evenly laid in clean water basin gallery of aerator;
The flexible hawser of aerator is fixed on clean water basin gallery, and aerator floats on the water surface, adjusts along with the change of level of clean water basin;
2) in PLC, set the concentration limit of haloform and chlorine residue respectively;
3) test set is arranged on the water outlet of clean water basin;
4) start detection equipment, detection data are passed to PLC by test set;
5) when the concentration of haloform in clean water basin is higher than limit value, PLC drives frequency transformer and ejector motor; The running of transducer drive inflation motor;
6), when described haloform detector detects that the concentration of haloform is in limits, PLC controls to make the frequency of inflation motor to reduce by 5 ~ 10Hz;
7), when described haloform detector detects that the concentration of haloform exceeds limit value, PLC controls to make the frequency of inflation motor to improve 5 ~ 10Hz;
8) repeating step 6)-7), when the frequency of inflating motor is reduced to 0, inflation motor decommissions; The highest frequency of described inflation motor is 50Hz;
9) when residual chlorine detecting instrument detects that in water, chlorine residue is lower than limit value, PLC gives the alarm, and Xiang Shuizhong strengthens chlorine-throwed quantity, and residual chlorine concentration is sounded all clear after reaching concentration limit.
As the preferred scheme of one of the present invention, step 1) in, described aerator is that 5 ~ 10:1 is arranged by gas-water ratio;
Gas-water ratio is: inflation total amount Q
gas/ maximum water supply flow Q
water max, according to the maximum water supply flow surveying clean water basin, inflation total amount can be drawn, when the aeration quantity of each aerator is known, the quantity of aerator can be drawn by gas-water ratio.
As the preferred scheme of one of the present invention, step 1) in, the laying distance between each aerator is L, L >=3m; Hypotelorism, aeration effective range can be overlapping, thus the free halogen air-blowing in water is taken off, and sterilisation effect weakens.
As the preferred scheme of one of the present invention, step 5) in, frequency during described inflation electric motor starting calculates as follows:
Wherein k is coefficient, and k is relevant to water temperature T, and when T≤15 DEG C, k value is 1, and as T>15 DEG C, k value is 0.5 ~ 0.8; Q
waterfor clean water basin water supply flow; Q
water maxfor clean water basin water supply peak flow; C is the detectable level of haloform; C
markfor inputting the concentration limit of the haloform of PLC; f
power frequencyfor 50Hz.
As the preferred scheme of one of the present invention, step 6) and 7) in, the frequency interval 1 ~ 2h of described inflation motor adjusts once; Interlude is consistent with clean water basin hydraulic detention time.
Beneficial effect of the present invention is:
1, need not lay aerating pipelines and air blast machine room is additionally set in clean water basin when the device of haloform is installed in removal water of the present invention, by directly laying aerator in water factory's clean water basin, fix with flexible hawser, float on the clean water basin water surface, and move up and down along with clean water basin change of level, construct simple and quick, do not affect clean water basin and run, be especially applicable to emergency processing during burst pollution;
2, the present invention is by the combination of inflator and ejector, and aeration quantity is large, and the bubble produced is small, and aeration is effective, and the reaction times is short, and without the need to adding chemical substance, full-automaticly to run, simple to operate, comprehensive treating process cost is lower;
3, be provided with test set in the present invention, the situation of the various material concentration of haloform in water temperature, water supply flow, clean water basin water outlet free residual chlorine and water can be detected simultaneously, so that operating device runs in time;
4, the present invention regulates the rotating speed of inflation motor by robot control system(RCS), and control aerator aeration rate, intelligent high-efficiency removes the haloform in clean water basin, greatly reduces energy consumption simultaneously;
5, aerator of the present invention adopts integrated design, the sterilizing agent such as stripping chlorine out can be sucked in water aeration again, avoid the sterilizing agents such as the chlorine added in clean water basin by a large amount of stripping out, ensure, in clean water basin water, there is enough free chlorine residuals, reach equilibrium state, make output water meet safety standards.
Invention accompanying drawing:
Fig. 1 is the aerator structural representation of haloform in removal water of the present invention;
Fig. 2 is the laying schematic diagram of the present invention at clean water basin;
Fig. 3 electrical block diagram of the present invention.
Wherein, 1, aerator; 11, shading rain cap; 12, inflator; 13, floating drum; 14, sealing bore; 15, ejector; 2, starting outfit; 21, motor is inflated; 22, ejector motor; 3, test set; 31, under meter; 32, temperature sensor; 33, residual chlorine detecting instrument; 34, haloform detector; 4, robot control system(RCS); 41, PLC; 42, frequency transformer.
Embodiment
Below, in conjunction with embodiment, the present invention is described further:
Specific embodiment:
Embodiment 1
With reference to Fig. 1 composition graphs 2, present embodiment discloses a kind of device removing haloform in water, comprise some aerators 1, starting outfit 2, test set 3 and robot control system(RCS) 4;
Each aerator 1 described comprises: shading rain cap 11, inflator 12, floating drum 13, sealing bore 14 and ejector 15; Described shading rain cap 11 lid is located at the top of inflator 12; Described floating drum 13 is arranged on the left and right sides of inflator 12 respectively; Described sealing bore 14 is connected with the lower end of inflator 12; Described ejector 15 is arranged on the lower end of sealing bore 14.Described starting outfit 2 comprises inflation motor 21 and ejector motor 22; Described inflation motor 21 is connected with inflator 12; Described ejector motor 22 is connected with ejector 15.Described test set 3 comprises: under meter 31, temperature sensor 32, residual chlorine detecting instrument 33 and haloform detector 34.Described robot control system(RCS) 4 comprises PLC 41 and frequency transformer 42.
The rotating speed of described inflation motor 21 is 1500r/min; The aeration quantity of described inflator 12 is 1000m
3/ h, the inflation depth of water of inflator 12 is 2.5m; The rotating speed of described ejector motor 22 is 1000r/min; The microbubble diameter of described release after ejector motor 22 cuts is 0.2 ~ 2mm.
With reference to Fig. 3, the first signal input part of described PLC 41 is connected with the signal output part of under meter 31; The second signal input terminus of described PLC 41 is connected with the signal output part of temperature sensor 32; 3rd signal input part of described PLC 41 is connected with the signal output part of residual chlorine detecting instrument 33; 4th signal input part of described PLC 41 is connected with the signal output part of haloform detector 34; First signal output part of described PLC 41 is connected with the signal input part of frequency transformer 42; The signal output part of described frequency transformer 42 is connected with the signal input part of inflation motor 21; The second signal output terminal of described PLC 41 is connected with the signal input part of ejector motor 22.
The use procedure of this device is as follows:
1) by vertical for some the aerators 1 floating stage casing being evenly laid in clean water basin gallery; Distance between each equipment is L=10m;
2) in PLC 41, set haloform respectively, comprising: the concentration limit of trichloromethane, chlorodibromomethane, Dichloro-monobromo methane, methenyl bromide and output water chlorine residue;
3) test set 3 is arranged on the water outlet of clean water basin;
4) start detection equipment 3, detection data are passed to PLC 41 by test set 3;
5) when the concentration of haloform in clean water basin is higher than limit value, PLC 41 controls frequency transformer 42 and starts, frequency transformer 42 drives inflation motor 21, the running of inflation motor 21 starts inflator 12 pump gas to sealing bore 14, then gas is through ejector 15, and ejector motor 22 sprays after operating and bubble being cut into microbubble.
Embodiment 2
Certain waterworks designed water 20000m
3/ d, adopts liquid chlorine as sterilizing agent, clean water basin water outlet trichloromethane concentration range 10.0 ~ 265.0 μ g/L, according to " drinking water sanitary standard GB5749-2006 ", the content of trichloromethane is no more than 60ug/L; Therefore, the highlyest 4.4 times are exceeded standard.
1) adopt device and method of the present invention as emergency trouble shooting measures, select the device of haloform in the removal water described in embodiment 1, maximum aeration quantity is 1000m
3/ h, by service discharge 1000m the highest during water factory
3/ h, lays aerator 1 by gas-water ratio 5:1, selects the number of units of aerator 1 to be 5; Start to lay successively toward back segment with the central position of clean water basin gallery overall length, laying distance between aerator 1 is 15m, every platform aerator 1 is fixed on the central position of clean water basin gallery with scalable hawser, aerator 1 swims in the clean water basin water surface, and can automatically regulate along with clean water basin height of liquid level.
2) concentration limit setting chlorine residue in PLC 41 is 0.3mg/L, and the concentration limit of haloform is 60 μ g/L.
3) at the water outlet of clean water basin, under meter 31, temperature sensor 32, residual chlorine detecting instrument 33 and haloform detector 34 are installed, detect data at clean water basin water outlet.
4) start detection equipment 3, haloform detector 34 detects that the concentration of trichloromethane is 216.0ug/L, and PLC 41 drives frequency transformer 42 and ejector motor 22; Frequency transformer 42 drives inflation motor 21 to operate; The frequency that inflation motor 21 starts calculates as follows:
Record T=22 DEG C by temperature sensor 32, k value is 0.75; Q is recorded by under meter 31
water=815m
3/ h; Q
water max=1000m
3/ h; C=216.0ug/L; C
mark=60ug/L; f
power frequency=50Hz, obtaining initiation culture f according to formulae discovery is 11Hz.
5) the frequency interval 2h of setting inflation motor 21 adjusts once, after inflation motor 21 starts 2h, detects that the concentration of trichloromethane is in limits, and PLC 41 controls to make the frequency of inflation motor 21 to reduce 5Hz.
6) after 2h, detect that the concentration of trichloromethane exceeds limits, PLC 41 controls to make the frequency of inflation motor 21 to improve 5Hz.
7) repeating step 5)-6), be reduced to 0 to the frequency of inflation motor 21, inflation motor 21 decommissions or reaches the highest frequency 50Hz of inflation motor 21.
Through 6h, trichloromethane detectable level is 45ug/L, and trichloromethane clearance is 79.2%, and output water residual chlorine concentration >=0.3mg/L, meets Effluent criteria.
For a person skilled in the art, according to technical scheme described above and design, other various corresponding change and distortion can be made, and all these change and distortion all should belong within the protection domain of the claims in the present invention.
Claims (10)
1. remove a device for haloform in water, it is characterized in that comprising some aerators, starting outfit, test set and robot control system(RCS);
Each aerator described comprises: shading rain cap, inflator, floating drum, sealing bore and ejector; Described rain cover cap is located at the top of inflator; Described floating drum is arranged on the left and right sides of inflator respectively; Described sealing bore is connected with the lower end of inflator; Described ejector is arranged on the lower end of sealing bore;
Described starting outfit comprises inflation motor and ejector motor; Described inflation motor is connected with inflator; Described ejector motor is connected with ejector;
Described test set comprises: under meter, temperature sensor, residual chlorine detecting instrument and haloform detector;
Described robot control system(RCS) comprises PLC and frequency transformer;
First signal input part of described PLC is connected with the signal output part of under meter; The second signal input terminus of described PLC is connected with the signal output part of temperature sensor; 3rd signal input part of described PLC is connected with the signal output part of residual chlorine detecting instrument; 4th signal input part of described PLC is connected with the signal output part of haloform detector; First signal output part of described PLC is connected with the signal input part of frequency transformer; The signal output part of described frequency transformer is connected with the signal input part of inflation motor; The second signal output terminal of described PLC is connected with the signal input part of ejector motor.
2. the device removing haloform in water as claimed in claim 1, is characterized in that: the rotating speed of described inflation motor is 500 ~ 3000r/min.
3. the device removing haloform in water as claimed in claim 1, is characterized in that: the aeration quantity of described inflator is 10 ~ 1000m
3/ h.
4. the device removing haloform in water as claimed in claim 1, is characterized in that: the inflation depth of water of described inflator is 2 ~ 6m.
5. the device removing haloform in water as claimed in claim 1, is characterized in that: the rotating speed of described ejector motor is 500 ~ 1500r/min; The microbubble diameter of described release after the cutting of ejector motor is 0.2 ~ 2mm.
6. remove a method for haloform in water, adopt the device of haloform in the arbitrary described removal water of claim 1-5, it is characterized in that comprising the following steps:
1) by some vertical floating stage casing or the rear ends being evenly laid in clean water basin gallery of aerator;
2) in PLC, set the concentration limit of haloform and chlorine residue respectively;
3) test set is arranged on the water outlet of clean water basin;
4) start detection equipment, detection data are passed to PLC by test set;
5) when the concentration of haloform in clean water basin is higher than limit value, PLC drives frequency transformer and ejector motor; The running of transducer drive inflation motor;
6), when described haloform detector detects that the concentration of haloform is in limits, PLC controls to make the frequency of inflation motor to reduce by 5 ~ 10Hz;
7), when described haloform detector detects that the concentration of haloform exceeds limit value, PLC controls to make the frequency of inflation motor to improve 5 ~ 10Hz;
8) repeating step 6)-7), when the frequency of inflating motor is reduced to 0, inflation motor decommissions; The highest frequency of described inflation motor is 50Hz;
9) when residual chlorine detecting instrument detects that in water, chlorine residue is lower than limit value, PLC gives the alarm, and Xiang Shuizhong strengthens chlorine-throwed quantity, and residual chlorine concentration is sounded all clear after reaching concentration limit.
7. the method removing haloform in water as claimed in claim 6, is characterized in that: step 1) in, described aerator is that 5 ~ 10:1 is arranged by gas-water ratio.
8. the method removing haloform in water as claimed in claim 6, is characterized in that: step 1) in, the laying distance between each aerator is L, L >=3m.
9. the method removing haloform in water as claimed in claim 6, is characterized in that: step 5) in, frequency during described inflation electric motor starting calculates as follows:
Wherein k is coefficient, and k is relevant to water temperature T, and when T≤15 DEG C, k value is 1, and as T>15 DEG C, k value is 0.5 ~ 0.8; Q
waterfor clean water basin water supply flow; Q
water maxfor clean water basin water supply peak flow; C is the detectable level of haloform; C
markfor inputting the concentration limit of the haloform of PLC; f
power frequencyfor 50Hz.
10. the method removing haloform in water as claimed in claim 6, is characterized in that: step 6) and 7) in, the frequency interval 1 ~ 2h of described inflation motor adjusts once.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511005981.XA CN105417610B (en) | 2015-12-25 | 2015-12-25 | A kind of device and method for removing haloform in water removal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511005981.XA CN105417610B (en) | 2015-12-25 | 2015-12-25 | A kind of device and method for removing haloform in water removal |
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|---|---|
| CN105417610A true CN105417610A (en) | 2016-03-23 |
| CN105417610B CN105417610B (en) | 2018-02-16 |
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ID=55496232
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