CN111175172A - Device for measuring specific resistance parameter of sludge, use method and application thereof - Google Patents
Device for measuring specific resistance parameter of sludge, use method and application thereof Download PDFInfo
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- CN111175172A CN111175172A CN201811331152.4A CN201811331152A CN111175172A CN 111175172 A CN111175172 A CN 111175172A CN 201811331152 A CN201811331152 A CN 201811331152A CN 111175172 A CN111175172 A CN 111175172A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
Abstract
The invention relates to the technical field of sludge treatment, and discloses a device for measuring a sludge specific resistance parameter, a using method and application thereof. The device comprises: the device comprises a filtering unit, an air supply unit, a filtrate collecting unit, a mass weighing unit and a counting unit. According to the invention, the air supply unit provides filtering pressure for the filtering unit, the sludge sample is filtered in the sealed positive pressure space of the filtering unit, the filtrate is obtained by the filtrate collecting unit and is conveyed to the mass weighing unit to weigh the mass of the filtrate, the counting unit in data communication with the mass weighing unit automatically obtains the mass of the filtrate and time interval data, and records the curve of the volume of the filtrate and the time to obtain the parameter b, so that manual reading is avoided, and the counting error of the traditional method is effectively reduced. Furthermore, the filter unit of the present invention has a sealed space that remains intact.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a device for measuring a specific resistance parameter of sludge, a using method and application thereof.
Background
The sludge specific resistance is an important index for evaluating the sludge dewatering performance, and the application is wide. The sludge specific resistance refers to the resistance of a unit dry weight of sludge filter cake per unit filter area under a certain pressure. At present, the method commonly used for measuring the specific resistance of the sludge is mainly a suction filtration type Brinell funnel method, and the method has the disadvantages of complex operation and large counting error. Typically, the buchner funnel is determined by measuring the rate at which the sludge filtrate filters through the media, i.e., R ═ 2pA2b/(μ C). R is the specific resistance of the sludge, p is the filtering pressure,a is the filtration area, b is the slope of the straight line of the ratio T/V-V of the filtration time T to the volume V of the filtrate, mu is the viscosity of the filtrate, C is the solids concentration of the filter cake after filtration of a unit volume of the filtrate, and C can be represented by the formula C1000C0Cb/(C0-Cb) And (6) obtaining. C0Is the solids concentration of the raw sludge, CbThe concentration of the filter cake after the filtration is finished. In scientific research and engineering practice, the specific resistance of the sludge needs to be accurately calculated, and the key point of measuring the specific resistance of the sludge is to measure the value b, so that the accurate acquisition of the value of the parameter b is the direction of research all the time.
Disclosure of Invention
The invention aims to overcome the defect of large counting error in the prior art, and provides a device for measuring a sludge specific resistance parameter, a using method and application thereof.
In order to achieve the above object, in a basic embodiment, the present invention provides an apparatus for measuring a specific resistance parameter of sludge, comprising:
the filter unit comprises a sealing body and a base connected with the sealing body, the sealing body is provided with a sample inlet and a gas inlet, the base is provided with a filtrate collecting tank and a filtrate outlet communicated with the filtrate collecting tank, and filter paper is arranged on the surface of the base; the sealing body is combined with the base to form a closed positive pressure space; the sludge enters a filtering unit through the sample inlet and is subjected to filter pressing to obtain filtrate;
the air supply unit is communicated with the air inlet of the filtering unit and is used for providing pressure for the filtering unit;
the filtrate collecting unit is communicated with the filtrate outlet and is used for collecting filtrate;
the mass weighing unit is positioned below the filtrate collecting unit and used for weighing the mass of the filtrate in the filtrate collecting unit in the filtrate collecting process;
and the counting unit is communicated with the mass weighing unit and is used for acquiring volume data and time data of the filtrate in the filtrate collecting process.
In a preferred embodiment, the filter unit further comprises a sealing ring, the sealing ring arranged along the circumferential direction of the base is arranged between the base and the sealing body, and one end of the sealing ring is fixed in the base.
In a preferred embodiment, the filtrate collection tank is arranged in an annular shape, and the sealing ring surrounds the filtrate collection tank.
In a preferred embodiment, the sample inlet is further provided with a sealing cover for sealing the sample inlet.
In a preferred embodiment, the filter unit further comprises fasteners surrounding the base and the seal body side walls for securing the seal body and the base.
In a preferred embodiment, the filtrate collection unit is in communication with the filtrate outlet via a collection tube.
In a preferred embodiment, the counting unit communicates with the mass weighing unit via a data line.
In a preferred embodiment, the mass weighing unit is a balance and the counting unit is a computer.
In a preferred embodiment, the gas supply unit further comprises a pressure control unit;
preferably, the pressure control unit comprises a pressure gauge, a pressure control valve and a gas switch, and is arranged on the gas inlet pipeline, and the gas inlet pipeline is communicated with the gas inlet of the filtering unit.
The second aspect of the invention provides a method for using the device for measuring the sludge specific resistance parameter so as to automatically, accurately and simply obtain the parameter b.
To achieve the purpose, in a basic embodiment, the invention provides a use method of the device for measuring the specific resistance parameter of the sludge, which comprises the following steps:
wetting filter paper, placing the filter paper on a base of a filter unit, matching a sealing body with the base, and fastening and sealing the matching position between the sealing body and the base;
(II) pouring a sludge sample from the sample inlet, and sealing the sample inlet;
(III) the air supply unit starts to supply air, and the mass weighing unit and the counting unit are started simultaneously;
and (IV) every other time period, the computer acquires time data T and filtrate mass data m corresponding to the time data T, and further acquires the slope of a straight line of the ratio T/V-V of the time T to the filtrate volume V, so as to obtain the sludge specific resistance parameter b.
In a preferred embodiment, the method of use further comprises: and (4) before gas supply is started in the step (3), adjusting the pressure control valve to enable the reading of the pressure gauge to be a fixed value p.
The invention also provides application of the device for measuring the sludge specific resistance parameter, and the device is used for measuring the sludge specific resistance.
According to the technical scheme, the air supply unit provides filtering pressure for the filtering unit, the sludge sample is filtered in the sealed positive pressure space of the filtering unit, the filtrate is obtained by the filtrate collecting unit and is conveyed to the mass weighing unit to weigh the mass of the filtrate, the counting unit in data communication with the mass weighing unit automatically obtains the mass of the filtrate and time interval data, and records the curve of the volume of the filtrate and the time to obtain the parameter b, so that manual reading is avoided, and the counting error of the traditional method is effectively reduced. In addition, the filter unit has a sealed space which is kept complete, and a stable operation environment is provided for the filter unit.
Drawings
FIG. 1 is a schematic structural diagram of a device for measuring specific resistance parameters of sludge according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of the structure of the base 4 of FIG. 1;
FIG. 3 is a schematic structural view of the fastener 5 of FIG. 1;
FIG. 4 is a schematic structural diagram of a device for measuring specific resistance parameters of sludge according to embodiment 2 of the present invention;
description of the reference numerals
1-sealing body, 2-sample inlet, 3-gas inlet, 4-base, 5-fastener, 6-gas inlet pipe, 7-collecting pipe, 8-collecting bottle, 9-analytical balance, 10-data line, 11-computer system, 12-nitrogen gas bottle, 13-gas switch, 14-pressure gauge, 15-pressure control valve, 2.1-sealing cover, 4.1-filtrate collecting tank, 4.2-filtrate outlet, 4.3-sealing ring, 5.1-tightening hoop and 5.2-bolt.
Detailed Description
In order to better understand the technical solutions, the technical solutions of the present application are described in detail with specific embodiments below, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, but not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict. It should be understood that the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The device for measuring the specific resistance parameter of the sludge provided by the embodiment of the invention comprises:
the filter unit comprises a sealing body and a base connected with the sealing body, the sealing body is provided with a sample inlet and a gas inlet, the base is provided with a filtrate collecting tank and a filtrate outlet communicated with the filtrate collecting tank, and filter paper is arranged on the surface of the base; the sealing body is combined with the base to form a closed positive pressure space; the sludge enters a filtering unit through the sample inlet and is subjected to filter pressing to obtain filtrate;
the air supply unit is communicated with the air inlet of the filtering unit and is used for providing pressure for the filtering unit;
the filtrate collecting unit is communicated with the filtrate outlet and is used for collecting filtrate;
the mass weighing unit is positioned below the filtrate collecting unit and used for weighing the mass of the filtrate in the filtrate collecting unit in the filtrate collecting process;
and the counting unit is communicated with the mass weighing unit and is used for acquiring volume data and time data of the filtrate in the filtrate collecting process.
In the filtering unit, the sealing body and the base are matched to form a closed space, the positions and structural forms of the sample inlet and the gas inlet are not limited, preferably, the sample inlet and the gas inlet are respectively positioned at the upper part of the sealing body, and the opening of the sample inlet can be set to be a conventional easily-poured structure with inclination, so that a sludge sample can be poured conveniently; preferably, the sample inlet can be further provided with a matched sealing cover, and the sealing body is sealed in the filtering process after the sample introduction is finished. The structure and material form of the sealing body are not limited, such as a pressure sealing tank, and the material can bear a certain pressure, such as 0 to 0.1 MPa; the structural form of the joint of the sealing body and the base is not limited, a conventional opening and closing structure is adopted, in order to ensure the sealing effect, a sealing ring can be additionally arranged for sealing a gap between the base and the sealing body, and preferably, the sealing ring can be placed in a groove of the base. In addition, in order to ensure the sealing effect, a fastener can be arranged around the outer surface of the base and the sealing body for fastening the sealing body and the base, and the structural form of the fastener is arranged according to the structure of the matching part of the sealing body and the base, for example, an integrated tightening ring which surrounds the outer surfaces of the circular sealing tank and the circular base is arranged, and the fastening ring is fixed by bolts. The base is provided with a filtrate collecting tank, preferably annular, which can uniformly collect filtrate.
The filtrate collecting tank is communicated with the filtrate outlet, the position of the filtrate outlet is not limited, the filtrate outlet is preferably the center of an annular collecting tank, and the filtrate in the collecting tank can quickly and uniformly reach the filtrate outlet.
The filtrate collecting unit includes a container for collecting the filtrate, and the structure and material form are not limited, such as a collecting bottle with a conventional structure and shape. The filtrate collection unit and the filtrate outlet can be communicated by adopting a collection conduit.
The mass weighing unit is used for weighing the mass of the filtrate in real time, and electronic or mechanical analysis balance weighing equipment can be adopted. The collection bottle is placed on a balance.
The counting unit can adopt a computer and other equipment, and can adopt a data line to be communicated with the mass weighing unit so as to acquire mass data and time data and process the data to obtain the relationship between the volume of the filtrate and the time. So as to obtain the slope of the straight line of the ratio T/V-V of the time T and the volume V of the filtrate, namely the sludge specific resistance parameter b.
The gas supply unit comprises an external gas storage device and a gas inlet pipeline, and gas in the gas inlet pipeline is introduced into the gas inlet of the filtering unit. Preferably, the air supply unit can be further provided with a pressure control unit; furthermore, the pressure control unit can comprise a pressure gauge, a pressure control valve and a gas switch, and can be arranged on the gas inlet pipeline, the pressure gauge and the pressure control valve control the pressure, and the gas switch controls the start or stop of gas inlet; therefore, the invention can adjust the pressure of the gas according to the actual requirement, and can adjust the pressure of 0 to 0.1MPa, wherein the gas is preferably nitrogen, and the gas storage device is a nitrogen bottle.
The embodiment of the invention also provides a using method of the device for measuring the sludge specific resistance parameter, which comprises the following steps:
wetting filter paper, placing the filter paper on a base of a filter unit, matching a sealing body with the base, and fastening and sealing the matching position between the sealing body and the base by using a fastener;
(II) pouring a sludge sample from the sample inlet, and sealing the sample inlet;
(III) the air supply unit starts to supply air, and the mass weighing unit and the counting unit are started simultaneously;
and (IV) every other time period, the computer acquires time data T and filtrate mass data m corresponding to the time data T, and further acquires the slope of a straight line of the ratio T/V-V of the time T to the filtrate volume V, so as to obtain the sludge specific resistance parameter b.
Wherein, the using method can also comprise the following steps: and (3) before gas supply is started in the step (three), adjusting the pressure control valve to enable the reading of the pressure gauge to be a fixed value p.
After the parameter b is obtained by the device for measuring the sludge specific resistance parameter, the sludge specific resistance can be further obtained according to a formula.
The invention will be described in detail below with reference to the drawings and specific embodiments.
Example 1
As shown in fig. 1-3, the device for measuring the specific resistance parameter of sludge in the embodiment includes: the device comprises a sealing body 1, a sample inlet 2, a sample inlet sealing cover 2.1, a gas inlet 3, a base 4, a fastener 5 (a tightening ring 5.1 and a bolt 5.2), a gas inlet pipe 6, a collecting pipe 7, a collecting bottle 8, an analytical balance 9, a data line 10, a computer system 11, a nitrogen bottle 12 and a nitrogen switch 13; and a filtrate collecting tank 4.1, a filtrate outlet 4.2 and a sealing ring 4.3 are arranged on the base.
And one end of the air inlet pipe 6 is connected with the nitrogen cylinder 12, and the other end of the air inlet pipe is connected with the top of the sealing body 1. The sealing body 1 and the base 4 are connected by a grip 5.1. The filter unit comprises a sample inlet sealing cover 2.1, a sample inlet 2, a sealing body 1 and a base 4 which are arranged from top to bottom. One end of the collecting pipe 7 is connected with the filtrate outlet 4.2, and the other end is arranged in the collecting bottle 8 and at the bottom of the collecting bottle. The collection vial 8 is placed on an analytical balance 9. The data line 10 connects the analytical balance 9 to a computer system 11 to form a data acquisition system. The inside of the filtering unit forms a closed positive pressure space. And the sample inlet 2 is used for dumping a sludge sample. The injection port sealing cover 2.1 is used for sealing the injection port. The collecting tank 4.1 is used for collecting filtrate obtained after the sludge is subjected to filter pressing. The sealing ring 4.3 is used for sealing a gap between the body 1 and the base 4. The filtrate outlet 4.2 is used for conveying filtrate. The grip 5.1 is used to secure and grip the seal body 1 and the base 4. Said inlet pipe 6 is used to feed nitrogen to the inlet pipe 3 to pressurise the filter unit. The collection tube 7 is used to transport the filtrate to a collection bottle 8. The collection bottle 8 is used to collect the entire filtrate. The analytical balance 9 serves to weigh the filtrate mass. The computer system 11 is used to record the filtrate mass versus time. The nitrogen cylinder 12 is used for providing nitrogen, and the air inlet pipe 6 is provided with an air switch 13.
The use method of the device for measuring the specific resistance parameter of the sludge comprises the following steps:
firstly, the computer system 11 and the analytical balance 9 are opened, medium-speed filter paper is wetted and placed on the base 4, the sealing ring 4.3 is placed in the groove of the base 4, and the sealing body 1 and the base 4 are clamped by the clamping ring 5.1.
And (II) pouring a sludge sample from the sample inlet 2, and then sealing by using a sample inlet sealing cover 2.1.
(iii) open gas switch 13 and simultaneously turn on the analytical balance.
(IV) the computer system 11 extracts T-V curve data (T is 5S interval timing), draws a T/V-V straight line and obtains a slope b, and the specific process comprises the following steps: recording a time t every 5siAt the same time, the computer reads and outputs the mass m of the filtrate displayed by the analytical balanceiObtaining volume data ViA straight line is drawn as the ratio T/V-V of the filtration time to the filtrate volume, and b is the slope of the straight line.
Example 2
As shown in fig. 4, the apparatus for measuring the specific resistance parameter of sludge according to embodiment 1 is different in that the apparatus further includes a pressure control unit, specifically including a pressure gauge 14 and a pressure control valve 15, which are disposed on the air inlet pipe 7. The pressure gauge 14 is used for recording the pressure value in the sealing body 1. The pressure control valve 15 is used to control the pressure inside the sealing body 1.
The device of the embodiment is used for measuring the specific resistance of sludge, and comprises the following specific steps:
first, the computer system 11 and the analytical balance 9 are opened, medium-speed filter paper is wetted and placed on the base 4, the sealing ring 4.3 is placed in the groove of the base, and the space between the sealing body 1 and the base 4 is tightened by the tightening ring 5.1.
And (II) adjusting the pressure control valve 15 to make the indication value p of the pressure gauge 14 be 60 KPa.
And (III) pouring a sludge sample from the sample inlet 2, and then sealing by using a sample inlet sealing cover 2.1.
And (IV) opening a nitrogen switch and simultaneously opening the analytical balance.
And (V) the computer system 11 extracts T-V curve data (T is 5S interval timing), draws a T/V-V straight line and obtains a slope b.
(VI) after the filtration is finished, putting the filter cake into an oven, drying at 105 ℃, measuring the solid concentration Cb of the filter cake, and then passing through a formula C-1000 ═ C0Cb/(C0-Cb) The solid concentration C of the cake after filtration of the unit volume of the filtrate was determined, and the specific sludge resistance R of 2pA was determined from the values of b and C obtained above, the set pressure p, the filtration area A (the area in the sealed vessel 1), and the filtrate viscosity μ2b/(μC)。
Example 3
Based on embodiment 1 measure device of mud specific resistance parameter, the difference lies in, the fastener is elastic rubber circle, the surface of locating the sealing body 1 and the base 4 junction is overlapped.
The device of the embodiment is used for measuring the specific resistance of the sludge, and the specific steps are the same as those of the embodiment 2.
The traditional method is adopted to measure the sludge specific resistance value, the manual reading is carried out, the average value is obtained through statistics according to the measured sludge specific resistance value every time, and compared with the average value, the single relative error can reach about 37%. Compared with the average value of the specific resistance values of the sludge measured in the embodiments 2 and 3 of the invention, the single relative error is only about 2 percent at most. Therefore, by adopting the parameter b obtained by the embodiment of the invention, the calculated sludge specific resistance has smaller error, and the counting error of the traditional method is effectively reduced.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The utility model provides a measure device of mud specific resistance parameter which characterized in that: the method comprises the following steps:
the filter unit comprises a sealing body (1) and a base (4) connected with the sealing body (1), the top of the sealing body (1) is provided with a sample inlet (2) and a gas inlet (3) respectively, the base (4) is provided with a filtrate collecting tank (4.1) and a filtrate outlet (4.2) communicated with the filtrate collecting tank (4.1), and filter paper is arranged on the surface of the base (4); the sealing body (1) is combined with the base (4) to form a closed positive pressure space; the sludge enters a filtering unit through the sample inlet (2) and is subjected to pressure filtration to obtain filtrate;
the air supply unit is communicated with the air inlet (3) of the filtering unit and is used for supplying pressure to the filtering unit;
a filtrate collection unit in communication with the filtrate outlet (4.2) for collecting filtrate;
the mass weighing unit is positioned below the filtrate collecting unit and used for weighing the mass of the filtrate in the filtrate collecting unit in the filtrate collecting process;
and the counting unit is communicated with the mass weighing unit and is used for acquiring volume data and time data of the filtrate in the filtrate collecting process.
2. The device according to claim 1, characterized in that the filter unit further comprises a sealing ring (4.3), the sealing ring (4.3) is arranged between the base (4) and the seal body (1) along the circumference of the base (4), and one end of the sealing ring (4.3) is fixed in the base (4).
3. The apparatus of claim 2, wherein said filtrate collection tank
(4.1) is arranged in a ring shape, and the sealing ring (4.3) surrounds the filtrate collecting groove (4.1).
4. Device according to claim 1, characterized in that the sample inlet (2) is further provided with a sealing lid (2.1) closing the sample inlet.
5. Device according to claim 1 or 2, characterized in that the filter unit further comprises fastening means (5) surrounding the base (4) and the side wall of the sealing body (1) for fastening the sealing body (1) and the base (4).
6. The device according to claim 1, wherein the filtrate collection unit is in communication with the filtrate outlet via a collection pipe (7);
preferably, the counting unit is communicated with the mass weighing unit through a data line (10);
preferably, the mass weighing unit is a balance, and the counting unit is a computer.
7. The apparatus of claim 1, wherein the gas supply unit further comprises a pressure control unit;
preferably, the pressure control unit comprises a pressure gauge (14), a pressure control valve (15) and a gas switch (13) which are all arranged on the gas inlet pipe (6), and the gas inlet pipe (6) is communicated with the gas inlet (3) of the filtering unit.
8. The use method of the device for measuring the specific resistance parameter of sludge according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
wetting filter paper and placing the filter paper on a base (4) of a filter unit, matching a sealing body (1) with the base (4), and fastening and sealing the matching position between the sealing body (1) and the base (4);
(II) pouring a sludge sample from the sample inlet (2), and sealing the sample inlet (2);
(III) the air supply unit starts to supply air, and the mass weighing unit and the counting unit are started simultaneously;
(IV) every other time period, the computer acquires time data TiAnd time data TiCorresponding filtrate mass data miAnd further obtaining the slope of a straight line of the ratio T/V-V of the time T to the volume V of the filtrate to obtain a sludge specific resistance parameter b.
9. Use according to claim 8, characterized in that: the use method further comprises the following steps: and (3) before gas supply is started in the step (three), adjusting the pressure control valve (15) to enable the reading of the pressure gauge to be a fixed value p.
10. Use of a device for measuring the specific resistance parameter of sludge according to any one of claims 1 to 7, characterized in that: the device is used for measuring the specific resistance of the sludge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811331152.4A CN111175172A (en) | 2018-11-09 | 2018-11-09 | Device for measuring specific resistance parameter of sludge, use method and application thereof |
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| CN201811331152.4A CN111175172A (en) | 2018-11-09 | 2018-11-09 | Device for measuring specific resistance parameter of sludge, use method and application thereof |
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Application publication date: 20200519 |