CN103543032A - Sampling method for mud cake water content detection of filter press - Google Patents
Sampling method for mud cake water content detection of filter press Download PDFInfo
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- CN103543032A CN103543032A CN201310530088.3A CN201310530088A CN103543032A CN 103543032 A CN103543032 A CN 103543032A CN 201310530088 A CN201310530088 A CN 201310530088A CN 103543032 A CN103543032 A CN 103543032A
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Abstract
The invention discloses a sampling method for mud cake water content detection of a filter press. The sampling method comprises the following steps: A, selecting three mud cakes Nn (n=1, 2, 3) on different positions on the filter press; B, setting five sampling points Cmn (m=1, 2, 3, 4, 5, n=1, 2, 3) on each mud cake (n), sampling mud samples from each sampling point Cmn, respectively, to form five independent samples Ymn (m=1, 2, 3, 4, 5, n=1, 2, 3); C, respectively sampling mud samples from five sampling points Cmn of each mud cake Nn, mixing to form a mixed sample Yn6 of the mud cake Nn; and D, respectively measuring the water content of the independent samples Ymn of each mud cake Nn and calculating an average water content Mn, detecting the water content of the mixed sample Yn6 of each mud cake Nn, combining with the average water content Mn, calculating the water content mean Mn of the mud cake, combining the water content means Mn of all mud cakes Nn, and calculating the mud cake water content mean M of the filter press. With the adoption of the sampling method, the errors caused by human factors can be reduced, and the property of the filter press can be indicated accurately.
Description
Technical field
The invention belongs to chemical industry and technical field of environmental science, especially relate to the method for sampling that a kind of pressure filter moisture content of the cake is measured.
Background technology
The mud of municipal wastewater treatment plant refers to dispose of sewage produced solid-state, semisolid and liquid discarded object, contain a large amount of organism, the abundant nutrients such as nitrogen phosphorus, heavy metal and pathogenic bacteria and pathogen etc., if do not add any discharge of processing and jettison, can not cause serious pollution to environment.How properly disposing sewage plant sludge, and effectively utilize it as a kind of new resource in addition, turn waste into wealth, become that municipal wastewater treatment plant and relevant departments improve technical level and the key factor of management level, is also the common problem of paying close attention in the whole world.
Universal, the raising of handling rate and the in-depth of degree for the treatment of along with sewage treatment facility, the generation of mud also sharply increases thereupon, therefore the minimizing of mud is particularly important, at present in sludge treatment technique, sludge conditioning squeezing deep dehydration can reduce the water percentage of mud to greatest extent, and the mud cake after processing can closely be connected with follow-up disposal technology, has realized the minimizing of Treatment of Sludge.
The nucleus equipment that conditioning squeezing deep dehydration adopts is pressure filter, and as plate and frame filter press, diaphragm filter press or high-pressure unit etc., wherein moisture content of the cake index is one of core process parameter detecting dehydration equipment performance and production capacity.Can therefore detecting accurately water percentage be the key that detects deeply dehydrating sludge effect, and sample accurately, be the key that detects water percentage.The water percentage of mud cake can reflect the performance of pressure filter and production capacity, sludge conditioner conditioning effect quality, mud cake specific drainage pressure.
The pressure filter course of work is: the filter plate of some is closely formed a line under the effect of strong mechanical force, between filter plate face, form filter chamber, filter material is admitted to filter chamber at powerful direct draught by central bore passage, entering solid portion in the material of filter chamber is filtered medium (as filter cloth) and holds back formation filter cake, liquid partly sees through filter medium and discharges filter chamber, thereby reach the object of Separation of Solid and Liquid, along with the increase of malleation pressure, Separation of Solid and Liquid is more thorough.Identical material with identical flow velocity from center pit injects pressure filter, material is being filtered indoor moveable with radial, gravity so flow velocity that the mobile material that makes progress will overcome self are less than charging flow velocity, the material flowing downward is because self gravitational attraction so flow velocity are greater than charging flow velocity, cause the skewness of material in filter chamber, cause the water percentage of a chamber internal filter cake diverse location different.
The detection of moisture content of the cake is divided into two parts and forms, a part is sampling, another part is detection method, at present for moisture content of the cake detection method, there is standard, but the sampling method for mud cake is random, the standard sample method of neither one standard, site operation personnel is in the process of pressure filter cake discharge, get at random some samples, adopt method and the step direct-detection water percentage of standard detection water percentage, way is infinitely amplified the personal error in sampling process like this, although can adopt standard method to detect water percentage, but because the personal error that sampling causes is excessive, therefore the water percentage detecting is not representative.
Summary of the invention
The object of this invention is to provide a kind of method of sampling that reduces to greatest extent personal error, accurately detects the pressure filter moisture content of the cake mensuration of moisture content of the cake.
Technical solution of the present invention is: the method for sampling that a kind of pressure filter moisture content of the cake is measured, it comprises the following steps: A, choose on pressure filter, be positioned at the three mud cake Nn(n=1,2,3 on diverse location); B, five sampled point Cmn(m=1,2,3,4,5, n=1,2,3 are set on every mud cake n), at each sampled point Cmn, gather respectively mud sample, form five independent sample Ymn(m=1,2,3,4,5, n=1,2,3); C, after gathering respectively mud sample and mix, five sampled point Cmn of every mud cake Nn form the biased sample Yn of this mud cake Nn
6; D, the independent sample Ymn of every mud cake Nn is respectively used to measure water percentage and calculates average moisture content Mn; By the biased sample Yn of every mud cake Nn
6for measure water percentage and with the water percentage mean value Mn of this piece mud cake of average moisture content Mn joint account
flat; By the water percentage mean value Mn of whole mud cake Nn
flatmerge and be used for calculating this pressure filter moisture content of the cake mean value M
flat.
Choose three mud cakes on pressure filter diverse location, the personal error of balanced sample to a certain extent, on every mud cake, gather respectively 5 independent sample, and the sample mix of five sampled points is become to biased sample, be respectively used to measure water percentage, therefore on each mud cake, have six samples, on three mud cakes, amount to 18 samples, can reduce to greatest extent the personal error causing in sampling process, thereby improve the precision that moisture content of the cake is measured.
In step B, on every mud cake n, along the perpendicular line by mud cake center pit, five sampled point Ym are set respectively from top to bottom.The process forming according to every mud cake is chosen respectively the sample of diverse location, thereby reflects more really the water percentage of this piece mud cake reality, further improves the precision of measuring.
In step B, in mud cake coboundary 0-10cm, coboundary to the intermediate point 0-10cm of center pit, in mud cake center pit 0-10cm, center pit arranges respectively five sampled point Ym to the intermediate point 0-10cm of lower limb, in lower limb 0-10cm.Fixed point arranges, and handled easily can be simplified the step of sampling.
In steps A, choose respectively a mud cake in the 1-5 piece mud cake of mud cake in the 1-5 piece mud cake of a mud cake in the 1-5 piece mud cake of pressure filter entrance side, middle and outlet side for measuring water percentage.According to Flow of Goods and Materials direction, gather respectively the mud cake of diverse location in pressure filter, more can reflect really the performance of pressure filter integral body.
Advantage of the present invention is: can reduce to greatest extent the error that human factor is brought, improve the precision that moisture content of the cake detects, reflect more accurately performance and the production capacity of pressure filter.
Embodiment
Embodiment 1:
By ram pump, the mud that mixes up is injected to pressure filter, totally 40 filter plates, entering mud pressure is 0.6MPa, charging instantaneous delivery 32m
3/ h, accumulative total inlet amount 28m3, detecting charging water percentage is 95.5%; Under the pressure of about 1.5MPa, squeeze after 20min, the mud cake unloading, is delivered to transport vehicle by the belt feeder with belt conveyer scale, belt conveyer scale be counted as 2.92 tons.According to the water percentage theoretical value of the constant calculating mud cake of butt amount, be 56.87%
In the process of cake discharge,
The mud cake N of A, the 2nd block of plate of selected distance press filtration machine head plate
1, apart from the mud cake N of the 2nd block of plate of pressure filter tailgate
2, apart from the mud cake N of the 22nd block of plate of press filtration machine head plate
3;
B, on every mud cake, along the perpendicular line by mud cake center pit, five sampled point Cmn (m=1,2,3,4,5, n=1,2,3) are set respectively from top to bottom, particularly, on mud cake N1, on top edge 5cm place arranges sampled point C
11, on top edge to the intermediate point 5cm place of center pit arranges sampled point C
21, near center pit, 5cm place arranges sampled point C
31, center pit to the intermediate point 5cm place of lower limb arranges sampled point C
41, lower limb 5cm place arranges sampled point C
51, at sampled point C
11, C
21, C
31, C
41, C
51the upper independent sample Y that chooses respectively
11, Y
21, Y
31, Y
41and Y
51; On mud cake N2 and N3, choose equally respectively 5 independent sample Y
12, Y
22, Y
32, Y
42, Y
52, Y
13, Y
23, Y
33, Y
43and Y
53;
C, at mud cake N
1five sampled point C
11, C
21, C
31, C
41, C
51upper mud sample rear this mud cake N that forms of mixing of gathering respectively
1biased sample Y
16; At mud cake N
2five sampled point C
12, C
22, C
32, C
42, C
52upper mud sample rear this mud cake N that forms of mixing of gathering respectively
2biased sample Y
26; At mud cake N
3five sampled point C
13, C
23, C
33, C
43and C
53the upper biased sample Y that gathers respectively mud sample and mix rear this mud cake of formation N3
36;
D, by sample Y
11, Y
21, Y
31, Y
41and Y
51be respectively used to measure water percentage and calculate mud cake N
1average moisture content M
1, by biased sample Y
16for measure water percentage and with the water percentage mean value M of average moisture content M1 joint account mud cake N1
1 is flat; By sample Y
12, Y
22, Y
32, Y
42, Y
52be respectively used to measure water percentage and calculate mud cake N
2average moisture content M
2, by biased sample Y
26be used for measuring water percentage and with average moisture content M
1joint account mud cake N
2water percentage mean value M
2 is flat; By sample Y
13, Y
23, Y
33, Y
43and Y
53be respectively used to measure water percentage and calculate the average moisture content M of mud cake N3
3, by biased sample Y
36be used for measuring water percentage and with average moisture content M
3joint account mud cake N
3water percentage mean value M
3 is flat; By mud cake N
1water percentage mean value M
1 is flat, mud cake N
2water percentage mean value M
2 is flatwith mud cake N
3water percentage mean value M
3 is flatmerge for calculating the water percentage mean value M of pressure filter mud cake
flat.
The measuring method of moisture content of the cake is: in < < CJ/T221-2005 sludge from wastewater treatment plant method of inspection > > " municipal sludge--mensuration of water percentage--gravimetric method ";
The required experimental facilities of measurement of water ratio:
TY10101A-2ETRT+10～300 ℃ electric drying oven with forced convection; Porcelain evaporating dishes: 100ml; Balance: sensibility reciprocal 0.001g; Dry equipment.
Measurement of water ratio method and step explanation:
1, taking the evaporating dish of constant weight is m
1;
2, the mud of getting after dehydration is put into evaporating dish through smashing the about 20g of uniform sample to pieces;
3, the mud of getting after dehydration is put into evaporating dish through smashing the about 20g of uniform sample to pieces, and this sample is accurately claimed to be designated as m to 0.001g;
4, the above-mentioned mud sample weighing up is directly put into baking oven, dry 2 hours of 103～105C; Taking-up sample is put into exsiccator and is cooled to room temperature, weighs, repeated multiple times, until constant weight is designated as m
2;
5, calculate
The numerical value of the water percentage ω of mud, represents with %, is calculated as follows:
In formula:
M-take the numerical value of mud sample quality, unit is gram (g);
M
1the numerical value of the empty evaporating dish quality of-constant weight, unit is gram (g);
M
2after-constant weight, evaporating dish adds the numerical value of mud sample quality after constant weight, and unit is gram (g).
Detailed data sees the following form 1.
As can be seen from Table 1, if calculate respectively five sampled point Cmn (m=1,2,3,4,5, n=1,2,3) and compound sample Yn
6the average moisture content H of (n=1,2,3)
m is flat, the average moisture content H of each sampled point
m is flatwith the theoretical water percentage comparison of accounting, the relative error of water percentage all>=1.63%, explanation is got at random one or several sample on mud cake surface and is detected water percentage, there will be the situation that error range is larger, by contrast, adopt the water percentage that sampling is measured after the method for sampling of the present invention to compare with accounting notional result, error is less, and accuracy rate is higher.
Embodiment 2
By ram pump, the mud that mixes up is injected to plate and frame filter press, totally 40 filter plates, entering mud pressure is 0.7MPa, charging instantaneous delivery 28m
3/ h, accumulative total inlet amount 22m3, detecting charging water percentage is 94%; Under the pressure of about 1.5MPa, squeeze after 20min, the mud cake unloading, is delivered to transport vehicle by the belt feeder with belt conveyer scale, belt conveyer scale be counted as 2.79 tons.According to the water percentage theoretical value of the constant calculating mud cake of butt amount, be 52.71%
In the process of cake discharge,
The mud cake N of A, the 4th block of plate of selected distance press filtration machine head plate
1, apart from the mud cake N of the 4th block of plate of pressure filter tailgate
2, apart from the mud cake N3 of the 18th block of plate of press filtration machine head plate;
B, on every mud cake, along the perpendicular line by mud cake center pit, five sampled point Cmn (m=1,2,3,4,5, n=1,2,3) are set respectively from top to bottom, particularly, at mud cake N
1upper, on top edge 5cm place arranges sampled point C
11, on top edge to the intermediate point 5cm place of center pit arranges sampled point C
21, near center pit, 5cm place arranges sampled point C
31, center pit to the intermediate point 5cm place of lower limb arranges sampled point C
41, lower limb 5cm place arranges sampled point C
51, at sampled point C
11, C
21, C
31, C
41, C
51the upper independent sample Y that chooses respectively
11, Y
21, Y
31, Y
41and Y
51; On mud cake N2 and N3, choose equally respectively 5 independent sample Y
12, Y
22, Y
32, Y
42, Y
52, Y
13, Y
23, Y
33, Y
43and Y
53;
C, at mud cake N
1five sampled point C
11, C
21, C
31, C
41, C
51upper mud sample rear this mud cake N that forms of mixing of gathering respectively
1biased sample Y
16; At mud cake N
2five sampled point C
12, C
22, C
32, C
42, C
52upper mud sample rear this mud cake N that forms of mixing of gathering respectively
2biased sample Y
26; At mud cake N
3five sampled point C
13, C
23, C
33, C
43and C
53the upper biased sample Y that gathers respectively mud sample and mix rear this mud cake of formation N3
36;
D, by sample Y
11, Y
21, Y
31, Y
41and Y
51be respectively used to measure water percentage and calculate mud cake N
1average moisture content M
1, by biased sample Y
16be used for measuring water percentage and with average moisture content M
1joint account mud cake N
1water percentage mean value M
1 is flat; By sample Y
12, Y
22, Y
32, Y
42, Y
52be respectively used to measure water percentage and calculate mud cake N
2average moisture content M
2, by biased sample Y
26be used for measuring water percentage and with average moisture content M1 joint account mud cake N
2water percentage mean value M
2 is flat; By sample Y
13, Y
23, Y
33, Y
43and Y
53be respectively used to measure water percentage and calculate mud cake N
3average moisture content M
3, by biased sample Y
36for measuring water percentage flat with the water percentage mean value M3 of average moisture content M3 joint account mud cake N3; By the water percentage mean value M of mud cake N1
1 is flat, mud cake N
2water percentage mean value M
2 is flatwith mud cake N
3water percentage mean value M
3 is flatmerge for calculating the water percentage mean value M of pressure filter mud cake
flat.
Measurement of water-content coefficient method is with embodiment 1.Detailed data sees the following form 2.
As can be seen from Table 2, if calculate respectively five sampled point Cmn (m=1,2,3,4,5, n=1,2,3) and compound sample Yn
6the average moisture content H of (n=1,2,3)
m is flat, the average moisture content H of each sampled point
m is flatwith the theoretical water percentage comparison of accounting, the relative error of water percentage all>=1.71%, explanation is got at random one or several sample on mud cake surface and is detected water percentage, there will be the situation that error range is larger, by contrast, adopt the water percentage that sampling is measured after the method for sampling of the present invention to compare with accounting notional result, error is less, and accuracy rate is higher.
Embodiment 3
By ram pump, the mud that mixes up is injected to plate and frame filter press, totally 40 filter plates, entering mud pressure is 0.65MPa, charging instantaneous delivery 36m
3/ h, accumulative total inlet amount 25m3, detecting charging water percentage is 94.5%; Under the pressure of about 1.5MPa, squeeze after 20min, the mud cake unloading, is delivered to transport vehicle by the belt feeder with belt conveyer scale,, belt conveyer scale be counted as 2.61 tons.According to the water percentage theoretical value of the constant calculating mud cake of butt amount, be 47.36%
The mud cake N1 of A, the 3rd block of plate of selected distance press filtration machine head plate, apart from the mud cake N of the 3rd block of plate of pressure filter tailgate
2, apart from the mud cake N3 of the 20th block of plate of press filtration machine head plate;
B, on every mud cake, along the perpendicular line by mud cake center pit, five sampled point Cmn (m=1,2,3,4,5, n=1,2,3) are set respectively from top to bottom, particularly, on mud cake N1, on top edge 5cm place arranges sampled point C
11, on top edge to the intermediate point 5cm place of center pit arranges sampled point C
21, near center pit, 5cm place arranges sampled point C
31, center pit to the intermediate point 5cm place of lower limb arranges sampled point C
41, lower limb 5cm place arranges sampled point C
51, at sampled point C
11, C
21, C
31, C
41, C
51the upper independent sample Y that chooses respectively
11, Y
21, Y
31, Y
41and Y
51; On mud cake N2 and N3, choose equally respectively 5 independent sample Y
12, Y
22, Y
32, Y
42, Y
52, Y
13, Y
23, Y
33, Y
43and Y
53;
C, at mud cake N
1five sampled point C
11, C
21, C
31, C
41, C
51upper mud sample rear this mud cake N that forms of mixing of gathering respectively
1biased sample Y
16; Five sampled point C at mud cake N2
12, C
22, C
32, C
42, C
52upper mud sample rear this mud cake N that forms of mixing of gathering respectively
2biased sample Y
26; Five sampled point C at mud cake N3
13, C
23, C
33, C
43and C
53the upper biased sample Y that gathers respectively mud sample and mix rear this mud cake of formation N3
36;
D, by sample Y
11, Y
21, Y
31, Y
41and Y
51be respectively used to measure water percentage and calculate mud cake N
1average moisture content M
1, by biased sample Y
16be used for measuring water percentage and with average moisture content M
1joint account mud cake N
1water percentage mean value M
1 is flat; By sample Y
12, Y
22, Y
32, Y
42, Y
52be respectively used to measure water percentage and calculate mud cake N
2average moisture content M
2, by biased sample Y
26be used for measuring water percentage and with average moisture content M1 joint account mud cake N
2water percentage mean value M
2 is flat; By sample Y
13, Y
23, Y
33, Y
43and Y
53be respectively used to measure water percentage and calculate mud cake N
3average moisture content M
3, by biased sample Y
36be used for measuring water percentage and with average moisture content M
3joint account mud cake N
3water percentage mean value M
3 is flat; By the water percentage mean value M of mud cake N1
1 is flat, mud cake N
2water percentage mean value M
2 is flatwater percentage mean value M with mud cake N3
3 is flatmerge for calculating the water percentage mean value M of pressure filter mud cake
flat.
Measurement of water-content coefficient method is shown in embodiment 1.Detailed data sees the following form 3.
As can be seen from Table 3, if calculate respectively five sampled point Cmn (m=1,2,3,4,5, n=1,2,3) and compound sample Yn
6the average moisture content H of (n=1,2,3)
m is flat, the average moisture content H of each sampled point
m is flatwith the theoretical water percentage comparison of accounting, the relative error of water percentage all>=1.61%, explanation is got at random one or several sample on mud cake surface and is detected water percentage, there will be the situation that error range is larger, by contrast, adopt the water percentage that sampling is measured after the method for sampling of the present invention to compare with accounting notional result, error is less, and accuracy rate is higher.
Above-listed detailed description is for the illustrating of possible embodiments of the present invention, and this embodiment is not in order to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or change, all should be contained in the scope of the claims of this case.
Claims (4)
1. the method for sampling that pressure filter moisture content of the cake is measured, is characterized in that: it comprises the following steps:
A, choose on pressure filter, be positioned at the three mud cake Nn(n=1,2,3 on diverse location);
B, five sampled point Cmn(m=1,2,3,4,5, n=1,2,3 are set on every mud cake n), at each sampled point Cmn, gather respectively mud sample, form five independent sample Ymn(m=1,2,3,4,5, n=1,2,3);
C, after gathering respectively mud sample and mix, five sampled point Cmn of every mud cake Nn form the biased sample Yn of this mud cake Nn
6;
D, the independent sample Ymn of every mud cake Nn is respectively used to measure water percentage and calculates average moisture content Mn; By the biased sample Yn of every mud cake Nn
6for measure water percentage and with the water percentage mean value Mn of this piece mud cake of average moisture content Mn joint account
flat; Flat merging of the water percentage mean value Mn of whole mud cake Nn is used for calculating this pressure filter moisture content of the cake mean value M
flat.
2. the method for sampling that a kind of pressure filter moisture content of the cake according to claim 1 is measured, is characterized in that: in step B, on every mud cake n, along the perpendicular line by mud cake center pit, five sampled point Cmn are set respectively from top to bottom.
3. the method for sampling that a kind of pressure filter moisture content of the cake according to claim 2 is measured, it is characterized in that: in step B, in mud cake coboundary 0-10cm, coboundary to the intermediate point 0-10cm of center pit, in mud cake center pit 0-10cm, center pit arranges respectively five sampled point Cmn to the intermediate point 0-10cm of lower limb, in lower limb 0-10cm.
4. the method for sampling of measuring according to a kind of pressure filter moisture content of the cake described in claim 1 or 2 or 3, it is characterized in that: in steps A, choose respectively a mud cake in the 1-5 piece mud cake of mud cake in the 1-5 piece mud cake of a mud cake in the 1-5 piece mud cake of pressure filter entrance side, middle and outlet side for measuring water percentage.
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| CN114166582A (en) * | 2022-02-09 | 2022-03-11 | 江苏光云环境科技有限公司 | Sewage sludge discharge device with intermittent sampling structure and method thereof |
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| CN103543032B (en) | 2015-09-30 |
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Inventor after: Huang Xinying Inventor after: Yang Haiying Inventor after: Wei Yuqin Inventor after: Hong Zhaorui Inventor after: Yang Chao Inventor after: Cai Xiaolong Inventor before: Yang Haiying Inventor before: Huang Xinying Inventor before: Wei Yuqin Inventor before: Hong Zhaorui Inventor before: Yang Chao Inventor before: Cai Xiaolong |
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