CN101200327A - Method for adjusting pH value of waste water - Google Patents
Method for adjusting pH value of waste water Download PDFInfo
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- CN101200327A CN101200327A CN 200610147381 CN200610147381A CN101200327A CN 101200327 A CN101200327 A CN 101200327A CN 200610147381 CN200610147381 CN 200610147381 CN 200610147381 A CN200610147381 A CN 200610147381A CN 101200327 A CN101200327 A CN 101200327A
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Abstract
The invention discloses a wastewater PH value adjusting method, which comprises the following: a. the wastewater pumped from wastewater tank is outputted into a water inlet pipe, the PH value of the wastewater measured in the water inlet pipe is compared with the target PH value, according to the comparative result, acid adding mode or alkali adding mode can be selected; b. the medicament corresponding to the acid adding mode or alkali adding mode is inputted from the medicine adding pipe and then is converged with the wastewater in the water inlet pipe, and both together enter a mixer to perform rapid mixing reaction; c. the wastewater at the outlet of the mixer is inputted into a balancer for collection, so as to make the PH value of wastewater be adjusted to the target PH value, and then the wastewater is outputted from the balancer, wherein before the step 3, the pre-adjusting steps same as the steps b and c can be performed in advance so as to make the PH value of wastewater reach the pre-adjusted PH value. The medicament amount mixed with the wastewater is adjusted according to the deviation between the PH value of wastewater and the target PH value, so as to form a closed-ring adjustment. The pipe type reaction method of the invention reduces the volume of equipment greatly and also improves PH value control precision of wastewater.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, relate in particular to a kind of method for adjusting pH value of waste water.
Background technology
PH regulator is the general procedure in the wastewater treatment process, satisfies processing requirement or emission standard requirement by pH measurement and adding of soda acid.Wastewater pH is regulated and is relied on the Artificial Control proportion very big at present, uses the pH test paper, and the variation of range estimation pH value adds acid or alkali by experience.Because the tolerance range of regulating relies on coarse test paper and people's experience, so the control effect that often can not get.
Wastewater treatment pH automatic adjustment technology had had development faster in recent years, and main the employing transferred ON/OFF position formula pH control techniques.Its shortcoming is that the volume of reactor is bigger, and control accuracy is relatively poor.A processing power 15m
3The volume of the automatic conditioned reaction device of the one-level pH of/h is greater than 3m
3, and reactor must be equipped with more powerful stirrer.Because the reactor conference causes control hysteresis, so general control accuracy can only reach setting point ± 0.5～1pH.The excessive reaction device can increase manufacturing cost and floor space, can cause that controlling quality is bad and medicament delivery is excessive and precision is low.
Summary of the invention
The object of the present invention is to provide a kind of method for adjusting pH value of waste water that improves control accuracy, reduces equipment volume.
The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of method for adjusting pH value of waste water, comprises the following steps:
A. the waste water that will extract from wastewater trough is imported in the hydraulic pipe-line, in hydraulic pipe-line, measure waste water pH value and with target pH value comparison, selection adds the garden sorrel formula or adds the alkali pattern according to comparative result;
B. from dosing pipe input with add the garden sorrel formula or add the corresponding medicament of alkali pattern, converge with waste water in the hydraulic pipe-line, enter together and carry out short mix in the mixing tank and react;
C. the waste water of described mixer outlet is imported in the equalizer and assembled, make waste water ph be adjusted to described target pH value, then from described equalizer output.
Above-mentioned method for adjusting pH value of waste water also can comprise steps d. measures the pH value of the waste water of the equalizer output among the described step c, and adjusts the pharmaceutical quantities that inputs to described dosing pipe among the described step b according to the deviate of described waste water ph and target pH value.
In the above-mentioned steps d, be preferably the deviate of described waste water ph and target pH value is carried out the PID computing, calculated the pharmaceutical quantities that inputs to described dosing pipe among the described step b.
In the above-mentioned method for adjusting pH value of waste water, before described step b, can carry out following pH value preconditioning step to waste water earlier:
A1. from dosing pipe input with add the garden sorrel formula or add the corresponding medicament of alkali pattern, converge with waste water in the hydraulic pipe-line, enter together and carry out short mix in the mixing tank and react;
A2. the waste water of described mixer outlet is imported in the equalizer and assembled, make waste water ph be adjusted to a pre-adjust pH, export waste water to the described step b hydraulic pipe-line from described equalizer then.
In the above-mentioned method for adjusting pH value of waste water, described pH value preconditioning step can comprise that also step a3. measures the pH value of the waste water of the equalizer output among the described step a2, and adjusts the pharmaceutical quantities that inputs to described dosing pipe among the described step a1 according to the deviate of described waste water ph and described pre-adjust pH.
Among the above-mentioned pH value preconditioning step a3, be preferably according to the deviate of described waste water ph and described pre-adjust pH and carry out the PID computing, calculate the pharmaceutical quantities that inputs to described dosing pipe among the described step a2.
Above-mentioned method for adjusting pH value of waste water can comprise that also step e. measures the pH value of the waste water of the equalizer output among the described step c, when waste water ph does not reach requirement, makes return of waste water to described wastewater trough, carries out the pH value again and regulates.
Owing to adopted technique scheme, waste water ph of the present invention is regulated compared with prior art, has following remarkable advantage:
1. use waste water circulation pipeline and tubular reactor, dwindled the volume of device greatly, the floor space of device only be routine chamber installation 1/5th;
2. the control accuracy of wastewater pH adjusting can reach target value ± 0.2pH;
3. the applied in any combination of mixing tank and equalizer can guarantee that pH measures and the stability of control, has eliminated the fluctuation of pH;
4. the twin-stage regulating step has satisfied the demand that wide cut pH adjusts, when the pH span of control limit of control up to 6 the time, the present invention still can guarantee the stable realization of target control value;
5. by the not satisfactory waste water that refluxes, avoided the discharge of defective waste water, strict control water outlet pH value meets target control value.
Description of drawings
Further specify the features and advantages of the present invention below in conjunction with the drawings and specific embodiments, wherein:
Fig. 1 is for realizing the designed apparatus structure synoptic diagram of method for adjusting pH value of waste water of first embodiment of the invention;
Fig. 2 is for realizing the designed apparatus structure synoptic diagram of method for adjusting pH value of waste water of second embodiment of the invention.
Embodiment
First embodiment
Fig. 1 is for realizing the designed apparatus structure synoptic diagram of method for adjusting pH value of waste water of first embodiment of the invention.This device mainly comprises hydraulic pipe-line 1, twin-stage tubular reactor 2,3, dosing performer 4 and controller 6.Wherein hydraulic pipe-line 1 is provided with waste water transferpump 11, in order to drawing water from wastewater trough, and is provided with soda acid and switches transmitter 12, to measure the waste water ph on the hydraulic pipe-line 1.A reactor 2 connects wastewater trough 10 by hydraulic pipe-line 1, and second reactor 3 links to each other with A reactor 2 by suction culvert 53.The outlet of second reactor 3 is provided with the delivery pipe 54 and the return line 55 of waste water.Delivery pipe 54 is provided with bleed valve 540.Return line 55 is connected to wastewater trough 10, and return line 55 is provided with reverse flow valve 550.
Dosing performer 4 comprises the sour medicine-chest 41 of storing acid medicine and the alkali medicine-chest 43 of storing basic agent.41 outlets of acid medicine-chest are provided with acid adding valve 42, and 43 outlets of alkali medicine-chest are provided with alkali addition valve 44.Be connected dosing pipe 51,52 behind acid adding valve 42 and the alkali addition valve 44, dosing pipe 51,52 is connected respectively to A reactor 2 and second reactor 3, dosing pipe 51 is provided with one-level dosing pump 45 simultaneously, dosing pipe 52 is provided with secondary dosing pump 46, and the medicament flow of dosing pump 45,46 can be regulated.The structure of following mask body narration A reactor 2 and second reactor 3.
A reactor 2 is used to carry out the preconditioning of pH value, and it comprises an one-level mixing tank 21 and a level equaliser 22.22 outlets of one level equaliser are provided with one-level pH transmitter 23.Second reactor 3 is used to carry out regulating eventually of pH value, and it comprises secondary mixing tank 31 and two level equalisers 32.32 outlets of two level equalisers are provided with two-stage pH sensing device 33.The effect of mixing tank 21,31 is the rapid as far as possible and mixing fully of waste water that make the medicament of adding and pass through, internal mixer being provided with helps the blade that liquid stirs, waste water and medicament are subjected to the leaf baffle bump and quicken to mix in mixing tank 21,31, help the carrying out of acid-base neutralisation reaction.When the linear velocity of mixing tank 21,31 is than very fast and dosing owing to flow through of short duration stop gap is arranged, certain fluctuation is arranged so leave the waste water ph of mixing tank 21,31.Equalizer 22,32 is containers of a profile rule, and effect is the reaction time that increases waste water, to eliminate the fluctuation of waste water ph, makes water outlet pH value more steady.The ready-made device of mixing tank 21,31 for can from market, buying.
The working process of the whole device of controller 6 controls, it is electrically connected with waste water transferpump 1, soda acid switching transmitter 12, one-level pH transmitter 23, two-stage pH sensing device 33, acid adding valve 42, alkali addition valve 44, one-level dosing pump 45, secondary dosing pump 46, bleed valve 540, reverse flow valve 550.
Below in conjunction with the method for adjusting pH value of waste water of device explanation first embodiment of the invention shown in Figure 1, present method comprises:
The model selection step
1) utilize waste water transferpump 11 to extract from wastewater trough in the waste water input hydraulic pipe-line 1, in hydraulic pipe-line 1, switch transmitter 12 by soda acid and measure the pH value of waste water and pass to controller 6, controller 6 compares itself and a target pH value reference mark.When the pH of waste water value during greater than target pH value, system is in and adds the garden sorrel formula, closes alkali addition valve 44, selects acid medicine; When the pH of waste water value during less than target pH value, system is in and adds the alkali pattern, closes acid adding valve 42, selects basic agent.
The preconditioning step of pH value:
2) open dosing pump 45,, converge, enter together and carry out short mix and reaction in the one-level mixing tank 21 with waste water in the hydraulic pipe-line 1 from the dosing pipe 51 input medicaments of A reactor 2.
3) waste water of one-level mixing tank 21 outlets is imported gathering in the level equaliser 22, increase the reaction time of waste water, eliminate the pH value fluctuation of waste water, make the pH value reach preconditioning pH value reference mark, export second reactor 3 to from a level equaliser 22 then.
The whole regulating step of pH value:
5) open dosing pump 46,, converge, enter together and carry out short mix and reaction in the secondary mixing tank 31 with waste water in the suction culvert 53 from the dosing pipe 52 input medicaments of second reactor 3.
6) waste water of secondary mixing tank 31 outlets is imported gathering in two level equalisers 32, increase the reaction time of waste water, eliminate the pH value fluctuation of waste water, make the pH value reach target pH value reference mark, then from 32 outputs of two level equalisers.
Above-mentioned pH value preconditioning process is preferably a closed control process, the one-level pH transmitter 23 that is located at a level equaliser 22 outlets is measured the waste water ph of outlet, controller 6 compares this waste water ph and a pre-adjust pH, adjust control signal according to the deviate of the two to dosing pump 45, thus the flow of control medicament.In a preferred embodiment, can adopt a PID (proportion integration differentiation) regulating step: the waste water ph and the deviate of pre-adjust pH are carried out the PID computing, calculated step 2) in input to the pharmaceutical quantities of dosing pipe 51.The PID regulate process is finished by controller 6, be a kind of very sophisticated prior art because PID regulates, so the present invention no longer is described in detail.
Similar with pH value preconditioning process, in the above-mentioned whole regulate process of pH value, the two-stage pH sensing device 33 that is located at the outlet of two level equalisers 32 measure outlet waste water ph and with the comparison of target pH value, adjust control signal according to the deviate of the two to dosing pump 46, thus the flow of control medicament.In a preferred embodiment, can adopt a PID regulating step: the deviate of waste water ph and target pH value is carried out the PID computing, calculated the pharmaceutical quantities that inputs to dosing pipe 52 in the step 5).
Under usual condition, the water of exporting from two level equalisers 32 discharges through delivery pipe 54.For the discharge of wastewater of avoiding the value of departing from objectives or enter later process, when the waste water ph that records when two-stage pH sensing device 33 is not consistent with target pH value, close bleed valve 540, open reverse flow valve 550 simultaneously, make waste water be back to wastewater trough 10, carry out the pH value again and regulate through return line 55.
For 2 examples practical work process of the present invention is described below:
With the pH value is that about 3 acid waste water adds alkali (NaOH) to be adjusted to 9.0 is example.The preregulated reference mark of pH is set in 5.5, and the target control point that pH regulates eventually is set in 9.0.Start waste water transferpump 11, the water inlet pH value that soda acid switching transmitter 12 is measured is less than target control point 9.0, and controller 6 sends signal, closes acid adding valve 42, system is in adds the alkali pattern.Determine the pid control parameter that pH preconditioning and pH regulate eventually when initial in system, as coefficients such as rate constant, derivative constant, integration constants, make A reactor 2 and second reactor 3 enter metastable PID state of a control, can revise a little significant parameter by suitable human intervention simultaneously, the control effect is improved.In definite process and normal handling process of pid control parameter, if from the waste water miss the mark reference mark that two level equalisers 32 are exported, controller 6 can cut out bleed valve 540, and reverse flow valve 550 is opened, and the water that does not reach requirement is flow back to wastewater trough 10.When pH regulates eventually stablely when reaching object point 9.0, system enters normal operating condition, and the pH value of water outlet can be stabilized in 9.0 ± 0.2pH.
With the pH value is that 11 alkaline waste water adds acid (HCl or H
2SO
4) be adjusted to 5.0 for example.The preregulated pH of pH reference mark set(ting)value is fixed on 9.0, and the target control point that pH regulates eventually is set in 5.0.Start waste water transferpump 11, the water inlet pH value that soda acid switching transmitter 12 is measured is greater than the target control point, and controller 6 sends signal, closes alkali addition valve 44, system is in adds the garden sorrel formula.Determine equally when initial to make A reactor 2 and second reactor 3 enter metastable PID state of a control by the pid control parameter that pH preconditioning and pH regulate eventually in system.In definite process and normal handling process of pid control parameter, if from the waste water miss the mark reference mark that two level equalisers 32 are exported, controller 6 can cut out bleed valve 540, and reverse flow valve 550 is opened, and the water that does not reach requirement is flow back to wastewater trough 10.When pH regulates eventually stablely when reaching target value 5.0, system enters normal operating condition, and the pH value of water outlet can be stabilized in 5.0 ± 0.2pH.
More than two control examples that add bronsted lowry acids and bases bronsted lowry be waste water pH value and target control point differ the comparatively situation of great disparity, if the two is more or less the same, then single-stage control also can realize the accurate adjusting of pH, the measurement function of soda acid switching this moment transmitter 12 is still worked, but have A reactor 2 or second reactor 3 to leave unused, the pH value of directly using one-level to regulate waste water is adjusted to the target control point.
Second embodiment
If the pH value of waste water is more stable, and the amplitude of regulating is less, can design single-stage pH regulator device, to reduce manufacturing cost.
Fig. 2 is for realizing the designed apparatus structure synoptic diagram of method for adjusting pH value of waste water of second embodiment of the invention.Different with Fig. 1 is to have omitted A reactor 2 and one-level dosing pump 45 among Fig. 2.
Correspondingly, the method for adjusting pH value of waste water of second embodiment of the invention is reduced to the following step:
The model selection step
1) utilize waste water transferpump 11 to extract waste water from wastewater trough 10, by hydraulic pipe-line 1 input reactor 3, in hydraulic pipe-line 1, switch transmitter 12 by soda acid and measure the pH value of waste water and pass to controller 6, controller 6 compares itself and a target pH value reference mark.When the pH of waste water value during greater than target pH value, system is in and adds the garden sorrel formula, closes alkali addition valve 44, selects acid medicine; When the pH of waste water value during less than target pH value, system is in and adds the alkali pattern, closes acid adding valve 42, selects basic agent.
The whole regulating step of pH value:
2) open dosing pump 46,, converge, enter together and carry out short mix and reaction in the mixing tank 31 with waste water in the hydraulic pipe-line 1 from the dosing pipe 52 input medicaments of reactor 3.
3) with assembling in the waste water input equalizer 32 of mixing tank 31 outlets, make the pH value directly reach target pH value reference mark, then from equalizer 32 outputs.
The same with first embodiment, in the above-mentioned whole regulate process of pH value, the pH transmitter 33 that is located at equalizer 32 outlet measure outlet waste water ph and with target pH value relatively, adjust control signal according to the deviate of the two, thereby control the flow of medicament dosing pump 46.In a preferred embodiment, can adopt a PID regulating step: the deviate of waste water ph and target pH value is carried out the PID computing, calculated step 2) in input to the pharmaceutical quantities of dosing pipe 52.
In definite process of pid control parameter and in the normal handling process, for the discharge of wastewater of avoiding the value of departing from objectives or enter later process, when the waste water ph that records when pH transmitter 33 is not consistent with target pH value, close bleed valve 540, open reverse flow valve 550 simultaneously, make waste water be back to wastewater trough 10, carry out the pH value again and regulate through return line 55.
Above embodiment explanation only is preferred embodiment explanation of the present invention, and those skilled in the art can make the replacement and the modification of other all equivalence according to the above embodiment of the present invention explanation.Yet these all equivalences of doing according to the embodiment of the invention are replaced and are revised, and belong to invention spirit of the present invention and reach by in the claim that claim defined.
Claims (7)
1. a method for adjusting pH value of waste water is characterized in that, comprises the following steps:
A. the waste water that will extract from wastewater trough is imported in the hydraulic pipe-line, in hydraulic pipe-line, measure waste water pH value and with target pH value comparison, selection adds the garden sorrel formula or adds the alkali pattern according to comparative result;
B. from dosing pipe input with add the garden sorrel formula or add the corresponding medicament of alkali pattern, converge with waste water in the hydraulic pipe-line, enter together and carry out short mix in the mixing tank and react;
C. the waste water of described mixer outlet is imported in the equalizer and assembled, make waste water ph be adjusted to described target pH value, then from described equalizer output.
2. method for adjusting pH value of waste water as claimed in claim 1 is characterized in that, also comprises step:
D. measure the pH value of the waste water of the equalizer output among the described step c, and adjust the pharmaceutical quantities that inputs to described dosing pipe among the described step b according to the deviate of described waste water ph and target pH value.
3. method for adjusting pH value of waste water as claimed in claim 2 is characterized in that, described steps d comprises:
Deviate to described waste water ph and target pH value is carried out the PID computing, is calculated the step that inputs to the pharmaceutical quantities of dosing pipe among the described step b.
4. method for adjusting pH value of waste water as claimed in claim 1 is characterized in that, before described step b, earlier waste water is carried out following pH value preconditioning step:
A1. from dosing pipe input with add the garden sorrel formula or add the corresponding medicament of alkali pattern, converge with waste water in the hydraulic pipe-line, enter together and carry out short mix in the mixing tank and react;
A2. the waste water of described mixer outlet is imported in the equalizer and assembled, make waste water ph be adjusted to a pre-adjust pH, export waste water to the described step b hydraulic pipe-line from described equalizer then.
5. method for adjusting pH value of waste water as claimed in claim 4 is characterized in that, described pH value preconditioning step also comprises step:
A3. measure the pH value of the waste water of the equalizer output among the described step a2, and adjust the pharmaceutical quantities that inputs to described dosing pipe among the described step a1 according to the deviate of described waste water ph and described pre-adjust pH.
6. method for adjusting pH value of waste water as claimed in claim 5 is characterized in that, described step a3 comprises:
Deviate to described waste water ph and described pre-adjust pH is carried out the PID computing, is calculated the step that inputs to the pharmaceutical quantities of described dosing pipe among the described step a1.
7. as claim 1 or 4 described method for adjusting pH value of waste water, it is characterized in that, also comprise step:
E. measure the pH value of the waste water of the equalizer output among the described step c, when waste water ph does not reach requirement, make return of waste water to described wastewater trough.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610147381A CN101200327B (en) | 2006-12-15 | 2006-12-15 | Method for adjusting pH value of waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610147381A CN101200327B (en) | 2006-12-15 | 2006-12-15 | Method for adjusting pH value of waste water |
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| Publication Number | Publication Date |
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| CN101200327A true CN101200327A (en) | 2008-06-18 |
| CN101200327B CN101200327B (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610147381A Expired - Fee Related CN101200327B (en) | 2006-12-15 | 2006-12-15 | Method for adjusting pH value of waste water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553424A (en) * | 2011-11-28 | 2012-07-11 | 中国神华能源股份有限公司 | Method for adjusting pH value of absorption column |
| CN104902688A (en) * | 2014-03-04 | 2015-09-09 | 宇宙电路板设备(深圳)有限公司 | Etching liquid adding method, device, and system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86201534U (en) * | 1986-04-09 | 1986-09-17 | 上海市永嘉仪表厂 | Digital ph value-measuring and displaying controller |
| CN2055953U (en) * | 1989-09-28 | 1990-04-11 | 哈尔滨工业大学 | On-line automatic controller for solution ph value |
| CN2197664Y (en) * | 1994-03-28 | 1995-05-17 | 赵东进 | Automatic pH value monitor |
-
2006
- 2006-12-15 CN CN200610147381A patent/CN101200327B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553424A (en) * | 2011-11-28 | 2012-07-11 | 中国神华能源股份有限公司 | Method for adjusting pH value of absorption column |
| CN102553424B (en) * | 2011-11-28 | 2014-04-02 | 中国神华能源股份有限公司 | Method for adjusting pH value of absorption column |
| CN104902688A (en) * | 2014-03-04 | 2015-09-09 | 宇宙电路板设备(深圳)有限公司 | Etching liquid adding method, device, and system |
| CN104902688B (en) * | 2014-03-04 | 2018-09-07 | 宇宙电路板设备(深圳)有限公司 | A kind of etching solution adding method, apparatus and system |
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| Publication number | Publication date |
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| CN101200327B (en) | 2012-09-19 |
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