CN102603044B - Method for reducing and controlling phosphorous in bottom mud of eutrophic water - Google Patents
Method for reducing and controlling phosphorous in bottom mud of eutrophic water Download PDFInfo
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Abstract
The invention discloses a method for reducing and controlling phosphorous in bottom mud of eutrophic water. The method includes adding salinity inhibitor aqueous liquor to a bottom mud surface of a bottom mud and overlaying water interface of the eutrophic water, hydrolyzing salinity inhibitor to form hydroxyl and metal ions, displacing out the weakly combined phosphorous in the bottom mud by means of competitive adsorption, and accordingly reducing and controlling the phosphorous in the bottom mud of the eutrophic water. The method is used for reducing and controlling the phosphorus in the bottom mud of shallow water by means of in-situ operation, the problem of endogenous eutrophic pollution brought by release of the weakly combined phosphorous in the bottom mud of the water due to poor management timeliness is thoroughly solved, management cost of the method is low, a treatment effect of the method is remarkable, the in-site operation can be realized, and the method is effective pretreatment technology for controlling the endogenous eutrophic pollution at present, and has an important and wide application prospect.
Description
(1) technical field
The present invention relates to a kind of eutrophic water body repairing method, particularly a kind of eutrophic water body sedimentary phosphate element is cut the method for control.
(2) background technology
Along with the raising of people to the quality of life requirement, the body eutrophication phenomenon that the phosphorus element causes has caused people's concern gradually, studies show that in a large number phosphorus is the modal Limiting nutrient salt of body eutrophication, the increase of phosphorus element has not only brought the consumption of Dissolved Oxygen in Water and the outburst of algal bloom, and a series of algae toxin that algae produces in reproductive process can be to the even larger harm of mankind's generation of hydrobiont.Although people have given enough attention to the control of phosphorus element, taked various measures with the direct discharging of the nutritive elements such as minimizing phosphorus to water body.But the Trend of Eutrophication of water body not therefore is not controlled effectively, and people begin gradually the research to endogenous phosphorus of the control research steering of phosphorus element in recent years.The phosphorus element of input water body is found in research, under the impact of various environmental factorss, through series of physical, chemistry and biological variation, wherein part is accumulated in settling with the phosphorus of different shape under the effects such as carrying, flocculation, precipitation gradually, yet when under the impact of the environmental factorss such as temperature, pH, Redox Condition, planktonic organism and disturbance, phosphorus element in settling can participate in the middle of the circulation of water/sediment interface again again, causes the endogenous eutrophication pollution of water body.Depend primarily on to the settling phosphorus control and to the absorption of overlying water phosphorus for the control of eutrophication pollution.
At present, the in-situ control method of Endogenous Phosphorus mainly contains Physical and geochemical method.Physical mainly contains the methods such as aeration, deep layer reoxygenation, water conservancy wash away, but that their ubiquities treatment cost is high, and water ecosystem is impacted the shortcomings such as large.Geochemical method is mainly by passive (as sandstone, clay etc.) or (as calcite, zeolite and material modified etc.) insulating covering agent initiatively, by absorption, flocculation, co-precipitation reach controls endogenous phosphate releasing, although being converted into the insoluble phosphorus permanent precipitation with a part of phosphorus, the method gets off, but along with the prolongation in treatment time and the change of ambient conditions, the phosphorus that exists with weak combined form greatly still can discharge bed mud, causes the endogenous eutrophication pollution.Therefore, present stage is administered the reactive behavior phosphorus that the emphasis of eutrophication pollution should be in the permanent elimination settling with how, and the eutrophication pollution that in thoroughly solving, external source phosphorus causes is particularly for being subjected to ambient conditions to affect larger shallow water body.
(3) summary of the invention
It is low that the object of the invention is to provide a kind of cost, simple to operate, successful can realize that the shallow water body sedimentary phosphate of former bit manipulation is cut control method, thoroughly solves to discharge the endogenous eutrophication pollution that brings because of bound phosphorus a little less than administering the Sediments that poor in timeliness causes.
Existing studies show that solves the management that focuses on Phosphorus in Sediments of the problem of endogenous eutrophication pollution, and for solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of eutrophic water body sedimentary phosphate element cut control method, described method is: the bed mud surface that the salinity adjusting control agent aqueous solution is added in the bed mud of eutrophication water-overlying water interface, the hydrolysis of salinity adjusting control agent forms hydroxide radical and metal ion, by displacement and competitive adsorption, bound phosphorus a little less than in bed mud is cemented out, thereby realize the control of cutting of eutrophic water body sedimentary phosphate element; Described salinity adjusting control agent strong base-weak acid salt, described strong base-weak acid salt is Potassium ethanoate or sodium-acetate.
Described eutrophic water body refers under the impact of mankind's activity, the nutritive substances such as biological required nitrogen, phosphorus enter the unhurried current water bodys such as lake, river mouth, bay in a large number, cause that algae and other planktonic organisms breed rapidly, the Dissolved Oxygen in Water amount descends, water quality deterioration, the water body of the phenomenons such as fish and other biological mortality.Bed mud of the present invention-overlying water interface refers to the interface of settling and overlying water in eutrophic water body, and this interface phosphorus burst size is higher usually.
Action principle of the present invention is: the salinity adjusting control agent is strong base-weak acid salt, after the water-soluble body of described strong base weak acid salts solution, the strong base weak acid salt hydrolysis produces weak acid root, metal ion, hydrogen ion and hydroxide ion on the one hand, the weak acid root knot is closed hydrogen ion, make reaction interface pH rise, phosphorus exists with the form of phosphate radical, at this moment OH
-With PO
4 3-Competitive adsorption is on sedimental active current potential, and pH is larger within the specific limits, OH
-Competitive capacity stronger, therefore PO
4 3-Be released; On the other hand, along with salinity continues to increase, the negatively charged ion competition is the Main Function of this moment, and flocs unit surface sorption current potential reaches capacity, so the amount of Phosphate Sorption acid group descends; In addition, metal ion is by competitive adsorption, contention iron bound phosphorus surface sorption point position, thus phosphate radical is dissociated out.
The salinity adjusting control agent aqueous solution of the present invention is the strong base weak acid salt brine solution, hydrolysis reaction can occur in water body, produce hydroxide radical and active metal ion, the present invention preferentially selects the Potassium ethanoate aqueous solution or sodium acetate aqueous solution, less and treatment effect preferably arranged because of its impact on water body, the acetate type material that hydrolysis simultaneously generates has certain sterilization antibacterial ability, and purifying water body is had certain benefit.
Further, the described salinity adjusting control agent aqueous solution is the Potassium ethanoate aqueous solution, and the add-on of the described Potassium ethanoate aqueous solution is counted 3.125～9.375g/m with Potassium ethanoate
2
Further, the concentration of the described Potassium ethanoate aqueous solution is 0.051～0.153mol/L.
Further, the described salinity adjusting control agent aqueous solution is sodium acetate aqueous solution, and the add-on of described sodium acetate aqueous solution is counted 2.615～7.845g/m with sodium-acetate
2
Further, the concentration of described sodium acetate aqueous solution is 0.043～0.129mol/L.
Eutrophic water body sedimentary phosphate element of the present invention cut control method, the speed that salinity adjusting control agent solution overflows at bed mud-overlying water interface is 5～10mL/min (preferred 10mL/min), time of application is 40-80min (preferred 40min).
More preferably, the described Potassium ethanoate aqueous solution is 0.625L/m at the amount of application on bed mud-bed mud surface, overlying water interface
2, concentration is 0.102mol/L, namely Potassium ethanoate aqueous solution add-on is counted 6.25g/m with Potassium ethanoate
2, the speed that the described Potassium ethanoate aqueous solution overflows at bed mud-overlying water interface is 10mL/min, time of application is 40min.
Most preferably, the described Potassium ethanoate aqueous solution is 0.625L/m at the amount of application on bed mud-bed mud surface, overlying water interface
2, concentration is 0.153mol/L, namely Potassium ethanoate aqueous solution add-on is counted 9.375g/m with Potassium ethanoate
2, the speed that the described Potassium ethanoate aqueous solution overflows at bed mud-overlying water interface is 10mL/min, time of application is 40min.
More preferably, described sodium acetate aqueous solution is 0.525L/m at the amount of application on bed mud-bed mud surface, overlying water interface
2, concentration is 0.085mol/L, namely the sodium acetate aqueous solution add-on is counted 5.25g/m with sodium-acetate
2, the speed that described sodium acetate aqueous solution overflows at bed mud-overlying water interface is 10mL/min, time of application is 40min.
The salinity adjusting control agent aqueous solution of the present invention is added in bed mud from eutrophication water-8～12cm position, overlying water interface by pressurization.
The present invention need to be with salinity adjusting control agent solution effects in bed mud-overlying water interface, can be accomplished in several ways, such as using dosing pump to bed mud-overlying water interface injection salinity adjusting control agent solution, as long as the active position that makes salinity adjusting control agent solution at bed mud-overlying water interface, is preferentially selected 10cm place on bed mud-overlying water interface.
The Potassium ethanoate aqueous solution of 5～15 ‰ salinity of the present invention refers to that the quality of Potassium ethanoate in 1000g water is 5～15g.
the present invention recommends a kind of expansible type chemicals feeder (patent No.: 201020130427.0) for the dispenser of salinity adjusting control agent solution, described expansible type chemicals feeder comprises removable extensible framework, the liquid medicine storage tank, the dosing peristaltic pump, some expansion units and liquid outlet terminal, on described removable extensible framework, the liquid medicine storage tank is installed, dosing peristaltic pump and some expansion units, described liquid medicine storage tank is connected with the dosing peristaltic pump by pipette, the liquid output tube of described dosing peristaltic pump is connected to the outer liquid outlet terminal of removable extensible framework, some liquid medicine spills holes is arranged on described liquid outlet terminal, described some expansion units are installed according to concrete engineering measure for those skilled in the art can remove phosphorus in overlying water or transform the difficult successive projects abatement equipment of utilizing attitude phosphorus etc.
Further, described removable extensible framework can expand to hold some expansion units in vertical and horizontal direction.
Further, described removable extensible framework be the bottom with the stainless steel framework of roller, which is provided with pushing hands and gas-liquid pipe hanger hook.
Further, be equipped with under meter and valve on the liquid output tube between the pipette between described liquid medicine storage tank and dosing peristaltic pump and dosing peristaltic pump and liquid outlet terminal.
Further, described dosing peristaltic pump can be realized carrying out synchronous processing and two kinds of patterns of individual curing separately with some expansion units according to specific requirement, described some expansion units are preferably tonic hold-up vessel unit or aeration unit, described tonic hold-up vessel unit is that successive projects control measures interpolation liquid is prepared, described tonic hold-up vessel unit is connected with the dosing peristaltic pump by the tonic pipette, described tonic pipette is provided with under meter and valve, described the present invention recommends to add calcium salt class passivator, can thoroughly reduce the activity that can utilize attitude phosphorus; Described aeration unit is that successive projects control measures aeration is prepared, described aeration unit is connected with the liquid outlet terminal by aeration tube, described aeration tube is provided with under meter and valve, the present invention recommends ozonation aerated unit, can improve the Eh value of overlying water, and can at bed mud-overlying water interface formation one deck barrier film, intercept exchanging of bed mud and overlying water phosphorus.
Further, dosing hold-up vessel of the present invention and tonic hold-up vessel unit are the cylindrical, hollow plexi-glass tubular.
The using method of expansible type chemicals feeder of the present invention is: at first need determine corresponding successive projects control measures, then the expansible type chemicals feeder is moved to the processing water body on-the-spot, and carry out the installation of expansion unit relevant device, complete the preparation work of expansion unit, the liquid outlet terminal is taken off from hook, deeply need to process Sediments-overlying water interface (bed mud top layer), open the dosing peristaltic pump, regulating flow quantity and operator scheme, carry out processing according to the actual requirements.
Compared with prior art, beneficial effect of the present invention is mainly reflected in: the inventive method be for realizing that the shallow water body sedimentary phosphate of former bit manipulation cuts control method, thoroughly solves to discharge the endogenous eutrophication pollution that brings because of bound phosphorus a little less than administering the Sediments that poor in timeliness causes; Treatment cost of the present invention is low, and treatment effect is obvious, can realize former bit manipulation, is to realize at present controlling comparatively effectively pretreatment technology of endogenous eutrophication pollution, has important and application prospect widely.
(4) description of drawings
Fig. 1 is the structural representation of the expansible type chemicals feeder of embodiment of the present invention use;
Fig. 2 is the treatment effect figure of the Potassium ethanoate aqueous solution experimental group of the present invention's 5 ‰ salinity;
Fig. 3 is the treatment effect figure of the Potassium ethanoate aqueous solution experimental group of the present invention's 10 ‰ salinity;
Fig. 4 is the treatment effect figure of the Potassium ethanoate aqueous solution experimental group of the present invention's 15 ‰ salinity;
Fig. 5 is the treatment effect figure of the sodium acetate aqueous solution experimental group of the present invention's 10 ‰ salinity.
(5) embodiment
The present invention is described further below in conjunction with specific embodiment, but protection scope of the present invention is not limited in this:
With reference to Fig. 1, the expansible type chemicals feeder, comprise removable extensible framework 1, dosing peristaltic pump 2, liquid medicine storage tank 3 and liquid outlet terminal 7, dosing peristaltic pump 2 and liquid medicine storage tank 3 are installed on described removable extensible framework 1, described liquid medicine storage tank 3 is communicated to dosing peristaltic pump 2 by pipette 31, described dosing peristaltic pump 2 is connected to the outer liquid outlet terminal 7 of removable extensible framework 1 by liquid output tube 21, and described liquid outlet terminal 7 surfaces are provided with liquid medicine spill hole 71.
Further, described liquid delivery conduit 21 is equipped with corresponding under meter 8 and valve 9 on pipette 31.
Further, described removable extensible framework 1 which is provided with pushing hands 10 and gas-liquid pipe hanger hook 11 for the stainless steel framework with roller 12.
Further, described dosing peristaltic pump 2 can be according to the synchronous processing of specific requirement realization and expansion unit and two kinds of operator schemes of individual curing separately.
Further, described liquid medicine storage tank 3 is the cylindrical, hollow plexi-glass tubular.
Further, also has vertical expansion unit 13 on described removable extensible framework 1, expansion unit 4, expansion unit 5 and expansion unit 6 also are installed in removable extensible framework 1, and described expansion unit can be installed according to concrete engineering measure can remove overlying water phosphorus or transform the equipment that the difficult successive projects that utilizes attitude phosphorus etc. is administered;
Described expansion unit 4 is tonic hold-up vessel unit (the successive projects control measures adds liquid and prepares), described tonic hold-up vessel unit is connected with dosing peristaltic pump 2 by the tonic pipette, described tonic pipette is provided with under meter and valve, and described tonic hold-up vessel unit is the cylindrical, hollow plexi-glass tubular; It is calcium salt class passivator tonic hold-up vessel that the present invention recommends tonic hold-up vessel unit, can thoroughly reduce the activity that can utilize attitude phosphorus.
Described expansion unit 5 is aeration unit (for successive projects control measures aeration is prepared), described aeration unit is connected with the liquid outlet terminal by aeration tube, described aeration tube is provided with under meter and valve, the present invention recommends ozonation aerated unit, can improve overlying water Eh value, and can intercept exchanging of bed mud and overlying water phosphorus at bed mud-overlying water interface formation one deck barrier film.
Described expansion unit 6 is prepared for the Other Engineering control measures.
Using method: in treating processes, at first need determine corresponding successive projects control measures, then the expansible type chemicals feeder be moved to the processing water body on-the-spot, and carry out the installation of expansion unit relevant device, complete the preparation work of expansion unit.The liquid outlet terminal is taken off from linking up with 11, deeply need to process the Sediments top layer, open dosing peristaltic pump 2, regulating flow quantity and operator scheme, carry out processing according to the actual requirements.
Embodiment 1:
Take sediment of West Lake, Hangzhou as processing object, adopt the expansible type chemicals feeder, Potassium ethanoate aqueous solution independent role and non-processor group compare experiment.Experiment is divided into 3 groups, and group 1 is the 0.051mol/L Potassium ethanoate aqueous solution (being salinity 5 ‰); Group 2 is for the 0.102mol/L Potassium ethanoate aqueous solution (being salinity 10 ‰), and group 3 is the 0.153mol/L Potassium ethanoate aqueous solution (being salinity 15 ‰), each group separately with without the Potassium ethanoate treatment group in contrast.
Group 1:0.051mol/L Potassium ethanoate aqueous solution independent role and non-processor group compare experiment.At high 120cm, add the bed mud of taking from the West Lake in the stainless steel back cover PVE pipe of diameter 80cm, to the 30cm place, add overlying water to the 80cm place, build the bottom mud in lake of simulation-overlying water system.Adopt the expansible type chemicals feeder directly to inject the Potassium ethanoate aqueous solution in bed mud-overlying water interface by the dosing peristaltic pump.In the Potassium ethanoate aqueous solution, Potassium ethanoate is 3.125g/m at the dosage at bed mud-overlying water interface
2, in the dosing peristaltic pump, the concentration of the Potassium ethanoate aqueous solution is 0.051mol/L, amount of application is 0.625L/m
2, the speed that the Potassium ethanoate aqueous solution overflows at bed mud-overlying water interface is 10mL/min, administration timing of drug is 40min, the results are shown in shown in Figure 2.
Group 2:0.102mol/L Potassium ethanoate aqueous solution independent role and non-processor group compare experiment.At high 120cm, add the bed mud of taking from the West Lake in the stainless steel back cover PVE pipe of diameter 80cm, to the 30cm place, add overlying water to the 80cm place, build the bottom mud in lake of simulation-overlying water system.Adopt the expansible type chemicals feeder directly to inject the Potassium ethanoate aqueous solution in bed mud-overlying water interface by the dosing peristaltic pump.In the Potassium ethanoate aqueous solution, Potassium ethanoate is 6.250g/m at the dosage at bed mud-overlying water interface
2, in the dosing peristaltic pump, the concentration of the Potassium ethanoate aqueous solution is 0.102mol/L, amount of application is 0.625L/m
2, the speed that liquor kalii acetici overflows at bed mud-overlying water interface is 10mL/min, administration timing of drug is 40min, the results are shown in shown in Figure 3.
Group 3:0.153mol/L Potassium ethanoate aqueous solution independent role and non-processor group compare experiment.At high 120cm, add the bed mud of taking from the West Lake in the stainless steel back cover PVE pipe of diameter 80cm, to the 30cm place, add overlying water to the 80cm place, build the bottom mud in lake of simulation-overlying water system.Adopt the expansible type chemicals feeder directly to inject the Potassium ethanoate aqueous solution in bed mud-overlying water interface by the dosing peristaltic pump.In the Potassium ethanoate aqueous solution, Potassium ethanoate is 9.375g/m at the dosage at bed mud-overlying water interface
2, in the dosing peristaltic pump, the concentration of the Potassium ethanoate aqueous solution is 0.153mol/L, amount of application is 0.625L/m
2, the speed that Potassium ethanoate overflows at bed mud-overlying water interface is 10mL/min, administration timing of drug is 40min, the results are shown in shown in Figure 4.
Detection method: the molybdenum-antimony anti-spectrophotometric method of stipulating in " water and effluent monitoring analytical procedure " that phosphoric acid salt adopts State Environmental Protection Administration to write is measured.
Fig. 2,3,4 results show, under without any treatment condition, the total phosphorous at bed mud-overlying water interface is 0～0.18mg/L; Under 0.051mol/L Potassium ethanoate aqueous solution independent role, the content of bed mud-overlying water interface total phosphorus is 0.15～1.40mg/L; Under 0.102mol/L Potassium ethanoate aqueous solution independent role, the content of bed mud-overlying water interface total phosphorus is 0.20～0.45mg/L; Under 0.153mol/L Potassium ethanoate aqueous solution independent role, the content of bed mud-overlying water interface total phosphorus is 0.20～0.65mg/L.
Result can find out, although control group under without any disposition, maximum value is only 0.18mg/L, its content is less than the standard value of III class water 0.2mg/L in " water environment quality standard GB3838-2002 ".But in the situation that enter without external source phosphorus, after only using the Potassium ethanoate aqueous solution (being that Potassium ethanoate aqueous solution salinity is 5 ‰-15 ‰) processing of 0.051～0.153mol/L, the total phosphorous of overlying water just increases considerably, its maximum value is up to 1.14mg/L, illustrate and have a large amount of phosphorus elements in bed mud, and under the processing of Potassium ethanoate, wherein the Endogenous Phosphorus take weak bound phosphorus as the master is with regard to a large amount of discharging to overlying water.At complicated external environmental condition, as stormy waves, sightseeing boat under the disturbances such as bottom-dwelling, is easy to cause the outrophication risk that causes because of internal phosphorus release.In treating processes, the treatment effect of the 0.153mol/L Potassium ethanoate aqueous solution (being salinity 15 ‰) is the most obvious, and to carry out engineering control comparatively favourable to follow-up.Treatment effect of the present invention is very obvious.
Embodiment 2:
Take sediment of West Lake, Hangzhou as processing object, adopt the expansible type chemicals feeder, the 0.085mol/L Potassium ethanoate aqueous solution (being that salinity is 10 ‰) independent role and non-processor group compare experiment.At high 120cm, add the bed mud of taking from Hangzhou West Lake in the stainless steel back cover PVE pipe of diameter 80cm, to the 30cm place, add overlying water to the 80cm place, build the bottom mud in lake of simulation-overlying water system.Adopt the expansible type chemicals feeder directly to inject salinity 10 ‰ sodium acetate aqueous solutions in bed mud-overlying water interface by the dosing peristaltic pump.In sodium acetate aqueous solution, sodium-acetate is 5.250g/m at the dosage at bed mud-overlying water interface
2, in the dosing peristaltic pump, the concentration of sodium acetate aqueous solution is 0.085mol/L, amount of application is 0.525L/m
2, the speed that sodium acetate aqueous solution overflows at bed mud-overlying water interface is 10mL/min, administration timing of drug is 40min, the results are shown in shown in Figure 5.
Fig. 5 result shows, under without any treatment condition, the total phosphorous at bed mud-overlying water interface is 0～0.18mg/L; Under 10 ‰ sodium acetate aqueous solution independent roles, the content of bed mud-overlying water interface total phosphorus is 0.095～1.63mg/L, in 0-19 after processing days overlying water, total phosphorous constantly increases, show that the phosphorus element in bed mud is discharged in a large number, though in 19-60 days overlying waters, total phosphorous descends to some extent, but still have the total phosphorus of 0.40-1.19mg/L in overlying water, with respect to the total phosphorous of control group 0.095-0.12mg/L, still demonstrate obvious total phosphorus release effects.Therefore, treatment effect of the present invention is very obvious.
Claims (7)
1. an eutrophic water body sedimentary phosphate element cuts control method, it is characterized in that described method is: the bed mud surface that the salinity adjusting control agent aqueous solution is added in the bed mud of eutrophication water-overlying water interface, the hydrolysis of salinity adjusting control agent forms hydroxide radical and metal ion, by competitive adsorption, weak bound phosphorus in bed mud is cemented out, thereby realize the control of cutting of eutrophic water body sedimentary phosphate element; Described salinity adjusting control agent is strong base-weak acid salt, and described strong base-weak acid salt is Potassium ethanoate or sodium-acetate; The speed that the described salinity adjusting control agent aqueous solution overflows at bed mud-overlying water interface is 5～10mL/min, and the described salinity adjusting control agent aqueous solution is added in bed mud from eutrophication water-8～12cm position, overlying water interface by dosing pump.
Eutrophic water body sedimentary phosphate element as claimed in claim 1 cut control method, it is characterized in that the described salinity adjusting control agent aqueous solution is the Potassium ethanoate aqueous solution, the add-on of the described Potassium ethanoate aqueous solution is counted 3.125～9.375g/m with Potassium ethanoate
2
Eutrophic water body sedimentary phosphate element as claimed in claim 2 cut control method, the concentration that it is characterized in that the described Potassium ethanoate aqueous solution is 0.051～0.153mol/L.
Eutrophic water body sedimentary phosphate element as claimed in claim 1 cut control method, it is characterized in that the described salinity adjusting control agent aqueous solution is sodium acetate aqueous solution, the add-on of described sodium acetate aqueous solution is counted 2.615～7.845g/m with sodium-acetate
2
Eutrophic water body sedimentary phosphate element as claimed in claim 4 cut control method, the concentration that it is characterized in that described sodium acetate aqueous solution is 0.043～0.129mol/L.
Eutrophic water body sedimentary phosphate element as claimed in claim 1 cut control method, it is characterized in that the described salinity adjusting control agent aqueous solution is the Potassium ethanoate aqueous solution of concentration 0.102mol/L, add-on is counted 6.25g/m with Potassium ethanoate
2
Eutrophic water body sedimentary phosphate element as claimed in claim 1 cut control method, it is characterized in that the described salinity adjusting control agent aqueous solution is the sodium acetate aqueous solution of 0.085mol/L, add-on is counted 5.25g/m with sodium-acetate
2
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