CN213875349U - Flocculation detection device and sewage treatment system - Google Patents
Flocculation detection device and sewage treatment system Download PDFInfo
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- CN213875349U CN213875349U CN202021929569.3U CN202021929569U CN213875349U CN 213875349 U CN213875349 U CN 213875349U CN 202021929569 U CN202021929569 U CN 202021929569U CN 213875349 U CN213875349 U CN 213875349U
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Abstract
A flocculation detection device, comprising: one end of the water taking pipe is arranged in the flocculation reaction tank and used for obtaining a detection sample, and the other end of the water taking pipe is connected into the sample container; the sample container is used for containing a detection sample taken from the flocculation sewage tank; and the image acquisition unit is used for acquiring an image of the detection sample. The device also comprises a light source, wherein the light source is used for irradiating the sample container, and the sample container is made of transparent materials. The device is used for analyzing and calculating the detection data of floccules in the detection sample solution in the flocculation reaction tank, and provides accurate flocculation dosing data for the sewage treatment process. The application also discloses a sewage treatment system.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, in particular to flocculation detection device and sewage treatment system.
Background
In the sewage treatment process, suspended substances in the sewage can be removed by sedimentation under the action of gravity. Flocculation precipitation (also known as interference precipitation) can be used depending on the nature, concentration and flocculation properties of the suspended material. When the concentration of suspended substances is about 50-500 mg/L, in the flocculation precipitation process, particles may collide with each other to generate flocculation, so that the particle size and the mass of the particles are gradually increased, the precipitation speed is increased continuously, and the actual precipitation speed is difficult to calculate by using a theoretical formula and is mainly determined by tests. A typical example of this precipitation is the precipitation of activated sludge in a secondary sedimentation tank.
The flocculation precipitation process requires the addition of a coagulant aid, so-called medicated flocculation. The amount of the added medicine needs to be observed at any time, and the dosage is adjusted in time according to the state change of the floccules in the sewage to be treated. In the prior art, the measurement of floc in water is generally completed by using a turbidity meter.
Floc is a suspension of particles in water, the quantity, size and distribution of which are the basis for judging the flocculation state and turbidity degree of liquid, and the observation of floc is to obtain data about the quantity, size and distribution of floc. Most of conventional turbidimeters adopt a photoelectric measurement method, a beam of parallel light irradiates a solution to be measured, a part of the parallel light is absorbed and scattered, a photoelectric receiving device is adopted to receive the intensity of scattered light in a direction which is 90 degrees to incident light, and the ratio of the intensity of the received scattered light to the intensity of the incident light is used for expressing the turbidity of the solution.
Obviously, the measurement method of the existing turbidimeter cannot express the quantity, size and distribution state of suspended particles in a solution, and cannot express the intensity of light scattered by each suspended substance. Meanwhile, the real-time and quick requirements for measuring the floccules in the flocculation precipitation cannot be met.
SUMMERY OF THE UTILITY MODEL
One of the embodiments of the utility model provides a flocculation detection device, include
One end of the water taking pipe is arranged in the flocculation reaction tank and used for obtaining a sewage detection sample, and the other end of the water taking pipe is connected into the sample container;
the sample container is used for containing a detection sample obtained from the flocculation reaction tank;
an image acquisition unit for acquiring an image of the test sample;
the light source is used for irradiating the sample container, and the sample container is made of a transparent material;
a lens disposed between the light source and the sample container.
The utility model discloses synthesize and utilize optical technology, automatic control technique and computer image recognition technology, the detection data of flocculus in the analysis and the calculation flocculation reaction tank detection sample solution, these detection data include the quantity of flocculus, size and distribution state and the scattered light intensity of each flocculus, dynamic analysis and the change process of calculating above-mentioned data provide accurate medicine control data for the sewage treatment process.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
FIG. 1 is a diagram showing an example of the composition of a conventional sewage treatment system.
FIG. 2 is a schematic diagram of a flocculation detection device according to an embodiment of the present invention.
Fig. 3 is a schematic view of a light source structure of a flocculation detection device according to an embodiment of the present invention.
Fig. 4 is a schematic view of an illumination mode according to an embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating the definition of GH parameter according to one embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating GDS parameter definition according to one embodiment of the present invention.
1-Water intake device
2-Intelligent Camera for image analysis
3-cylindrical lens
4-linear laser light source
5-glass water container with fixed capacity (black bottom, anti-reflection side)
6-flocculation reaction tank
7-water intake pipe
Detailed Description
The existing sewage treatment system comprises a coarse sedimentation tank, a biological sedimentation tank, a dosing flocculation tank, a flocculation reaction tank, a floccule sedimentation tank and a deodorizing and decolorizing adsorption tank. The dosing device is arranged in a dosing flocculation tank, and the flocculation analyzer (usually adopting a turbidity meter) is arranged in a flocculation reaction tank. The analysis result of the flocculation analyzer is used for controlling the dosage of the dosing device. As shown in fig. 1.
In accordance with one or more embodiments, as shown in fig. 2, a flocculation detection apparatus comprises: one end of the water taking pipe is arranged in the flocculation reaction tank and used for taking a detection sample, and the other end of the water taking pipe is connected into the sample container through a water taking pump; the sample container is used for containing a detection sample taken from the flocculation sewage tank; and the image acquisition unit is used for acquiring an image of the detection sample.
The device also comprises a laser line light source which is used for irradiating the sample container, so that the image acquisition unit obtains a clearer detection sample image. The sample container is made of transparent materials. The background surface of the sample container, which is shot by the image acquisition unit to detect the sample, is set to be black, and the side surface of the sample container is provided with a measure for increasing the transmission light, such as being coated with an anti-reflection film or adopting a material for enhancing the transmission light. The sample container can be an open face container, and the open face can be round or square. And a cylindrical lens is arranged between the light source and the sample container and is used for forming a highlighted water sample section which is helpful for the image acquisition unit to acquire the detected sample image in the sample container.
Furthermore, the flocculation detection device also comprises an image processing unit which calculates and analyzes the number, the size and the distribution state of the floccules in the detection sample after the detection sample image is obtained.
According to one or more embodiments, the device for flocculation analysis and turbidity judgment comprises a liquid detection sample extraction module, a light source system, an optical imaging system, a shooting module and a flocculent analysis module.
The sample extraction module consists of a water tank with unit volume, a corresponding liquid supply system and a pipeline. Wherein the water tank of unit volume is used for storing a liquid sample to be tested from a liquid source. The corresponding liquid supply system and the corresponding pipeline provide guarantee for achieving the purpose. The liquid supply system includes a water intake device, which may be a water pump, for pumping liquid. The liquid is a test sample containing floe.
The light source system is composed of a linear light source generator and a cylindrical lens, wherein the linear light source generator generates linear light scattered in a fan-shaped manner in a linear direction, and the cylindrical lens constrains the linear light scattered in the fan-shaped manner in the linear direction into linear quasi-parallel light having a certain width in a certain range, as shown in fig. 3. The cylindrical lens can be regarded as a lens with a plane incident surface and a cylindrical emergent surface, wherein the incident surface is formed by vertically cutting a cylindrical mirror surface.
The optical imaging system is affected by the illumination mode of the light source, as shown in FIG. 4 and the quasi-parallel light imaging mode. The plane formed by the linear quasi-parallel light is vertical to the image shooting direction, the linear quasi-parallel light irradiates floccules and particles in water, the image shooting device receives the image formed by scattered light in the 90-degree direction, and the shooting lens adopts a quasi-parallel light lens.
The camera module consists of a camera using a quasi-parallel light lens, which takes a liquid sample placed in a unit volume of water bath as shown in fig. 4. The camera's field of view covers the tank of the liquid sample, and the liquid sample in the tank is continuously updated at the rate of normal flow of liquid in the liquid source, and the camera takes a picture of the liquid sample in a high-speed shooting mode.
The flocculent analysis module analyzes and calculates the number of flocculents, extracts each flocculent and the shape and size of particles and the scattering light intensity of incident light for the shot liquid sample image. And a statistical histogram is made for each physical quantity.
The flocculent analysis module analyzes and calculates the number of flocculents, extracts each flocculent and the shape and size of particles and the scattering light intensity of incident light for the shot liquid sample image. A statistical histogram is made for each physical quantity: (1) a histogram of the number of floes with time t as a variable, which reflects the statistical state of the number of floes in a time period; (2) a difference histogram of the floccule quantity with time t as a variable, which reflects the statistical state of the change gradient of the floccule quantity in a time period, wherein the third-order dynamic moment thereof reflects the change trend of the floccule quantity; (3) the statistical histogram of the sizes of the floccules at the moment t reflects the distribution state of the sizes of the floccules at the moment t, and the third-order dynamic moment of the statistical histogram reflects the distribution trend of the sizes of the floccules at the moment t; (4) the third moment of the floe size is a histogram with time t as a variable, which reflects the state of change of the floe size over a period of time.
Furthermore, the floccules can be subjected to cluster analysis, and the statistical parameter with the time t as a variable can reflect the characteristics of the change of the size and the quantity of the floccules along with the time. And determining a dosing strategy of the flocculation sewage tank according to the detection and analysis of the floccules.
In accordance with one or more embodiments, a flocculation detection method includes: the method comprises the steps of taking a detection sample from a flocculation sewage tank, introducing the detection sample into a sample container, shooting the detection sample in the sample container to obtain an image of the detection sample, and accumulating the detection data of the multiple shot samples when the sample volume of the multiple shot samples is accumulated to 1000 ml to form the detection data of a unit volume sample, wherein the detection data comprises the number, the size and the distribution state of floccules and the scattered light intensity of each floccule. If the sample detection data is set as the particle distribution of the sample, the process is as follows:
using the photographed sample region as a sample volume for one detection, when the sample volumes photographed a plurality of times are accumulated to 1000 ml, the sample particle distributions photographed a plurality of times are accumulated to form a sample particle distribution per unit volume of the sample, that is,
and (3) counting three data of GH number (particle size distribution), GROF (flocculation change rate) and GDS (distribution skewness) of a detection sample, and comparing the data with prior data to obtain a result that the current dosage is slightly more or less. Wherein the content of the first and second substances,
the GH number (English syllabification is a granularity history) is a group of data describing particle size distribution, and expresses the relationship between the particle size and the number (or probability) of the particles, and the member data is a certain particle size (particle size) giNumber of particles N (g) presenti) Or the corresponding probability p (g)i):N(gi)＝H(gi) Or p (g)i)＝H(gi) I is 0,1, …, n-1. Fig. 5 is a schematic diagram illustrating the definition of the parameter.
The flocculation rate (gross rate of flocule, abbreviated as GROF) is the data describing the flocculation change (floc growth) expressed as the derivative of GH number over time t. For a certain particle size giThe number of particles at time t is N (g)iT), then flocculated to dN (g) as a rate of change in particle number expressioniT)/dt, in units of particles/second; the grain size g at time t when GH number is expressed as probabilityiHas a probability of p (g)iT) the flocculation rate of change is dp (g)iT)/dt in percent/sec.
Distribution Skewness (GDS), which is an acronym for global distribution skewness, describes the degree to which a current particle size distribution deviates from a reference particle size distribution. When the positive deviation occurs, the median particle size is smaller than the mean value, and the particle size distribution is concentrated in small particles; when a negative bias occurs, the median particle size is greater than the mean and the particle size distribution is centered on large particles. The bias values are characterized by mean minus median: s ═ med (g) -mean (g) in particle size. Fig. 6 is a schematic diagram illustrating the parameter definition.
According to one or more embodiments, a sewage treatment system comprises a dosing flocculation tank and a flocculation reaction tank, wherein the dosing flocculation tank is provided with a dosing device, and the flocculation reaction tank is provided with a flocculation detection device. The flocculation detection device includes: one end of the water taking pipe is arranged in the flocculation reaction tank and is used for taking a sewage detection sample, and the other end of the water taking pipe is connected into the sample container through a water drawing pump; the sample container is made of transparent materials and is used for containing a sewage detection sample obtained from the flocculation reaction tank; a camera or a video camera, the lens of which is directly opposite to the sample container positioned at the lower part from the upper part, and is used for acquiring the image of the detection sample, and the color of the background surface shell of the detection sample shot by the camera or the video camera of the sample container is set to be black; a linear laser light source for illuminating the sample container; a cylindrical lens disposed between the linear laser light source and a sample container; and the image processor is used for calculating and analyzing the number, the size and the distribution state of the floccules in the detection sample after acquiring the image of the detection sample.
The flocculation detection device is coupled with the dosing device through wired or wireless communication, and the image processor calculates dosing quantity parameters by analyzing floccules in a detection sample and transmits the dosing quantity parameters to the dosing device through the communication interface to control the dosing quantity.
It is worth noting that while the foregoing has described the spirit and principles of the present invention with reference to several specific embodiments, it is to be understood that the present invention is not limited to the disclosed embodiments, nor is the division of aspects, which is for convenience only as the features in these aspects cannot be combined. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (6)
1. A flocculation detection device is used for flocculation detection of a sewage treatment system, the sewage treatment system comprises a coarse sedimentation biological sedimentation tank, a dosing flocculation tank, a flocculation reaction tank, a sedimentation tank and a deodorization and color removal adsorption tank,
the outlet of the dosing device of the sewage treatment system is arranged on the dosing flocculation tank, and is characterized in that the flocculation detection device comprises,
one end of the water taking pipe is arranged in the flocculation reaction tank and used for obtaining a sewage detection sample, and the other end of the water taking pipe is connected into the sample container;
the sample container is made of transparent materials and is used for containing a sewage detection sample obtained from the flocculation reaction tank;
a camera or a video camera, the lens of which is directly opposite to the sample container positioned at the lower part from the upper part, and is used for acquiring the image of the detection sample, and the color of the background surface shell of the detection sample shot by the camera or the video camera of the sample container is set to be black;
a linear laser light source for illuminating the sample container;
a cylindrical lens disposed between the linear laser light source and a sample container;
and the image processor is used for calculating and analyzing the number, the size and the distribution state of the floccules in the detection sample after acquiring the image of the detection sample.
2. The flocculation detection device of claim 1, wherein the flocculation detection device is communicatively coupled to the dosing device, and wherein the image processor calculates a dosing parameter by analyzing floe in the detection sample and transmits the dosing parameter to the dosing device via the communication interface.
3. The flocculation detection apparatus of claim 1, wherein the other end of said water intake conduit is first connected to a water intake device, said water intake device being in communication with said sample container.
4. A flocculation detection apparatus according to claim 3, wherein said water intake device is a water pump.
5. A flocculation assay apparatus as claimed in claim 1, wherein said sample container is an open face container.
6. A sewage treatment system, characterized in that a flocculation reaction tank of the sewage treatment system is provided with the flocculation detection device of claim 1.
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| CN114863313A (en) * | 2022-03-24 | 2022-08-05 | 上海擎测机电工程技术有限公司 | Water treatment process monitoring method based on image recognition |
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| CN114863313A (en) * | 2022-03-24 | 2022-08-05 | 上海擎测机电工程技术有限公司 | Water treatment process monitoring method based on image recognition |
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