CN104075910B - A kind of for the sampling detecting device in printing and dyeing wastewater treatment system - Google Patents

Abstract

The invention relates to a detection device used in a physical and chemical treatment system of printing and dyeing wastewater. A sampling detection device used in a printing and dyeing wastewater treatment system, comprising a sampling water inlet pipe, a buffer filter for removing impurities in the printing and dyeing wastewater, a flocculant adding device, and a detection box for detecting the transmittance of the printing and dyeing wastewater; sampling The output end of the water inlet pipe is connected to the detection box, and the buffer filter is set on the sampling water inlet pipe on the front side of the detection box; the input end of the flocculant adding device is connected to the buffer filter and the sampling water inlet pipe of the detection box; the supernatant in the settling device The water outlet is connected to the printing and dyeing wastewater inlet pipe in the detection device for detecting the light transmittance of the printing and dyeing wastewater supernatant. The sampling and detection device samples the printing and dyeing wastewater, first settles and separates the supernatant, and then detects the light transmission ability of the printing and dyeing wastewater supernatant, and uses the signal of light intensity as an available control signal, so as to provide printing and dyeing wastewater. Handling systems better build control systems.

Description

A sampling detection device used in printing and dyeing wastewater treatment system

technical field

The invention belongs to the field of sewage treatment, in particular to a detection device used in a physical and chemical treatment system of printing and dyeing wastewater.

Background technique

China is the world's largest producer and exporter of textiles and clothing, so the printing and dyeing industry is closely related to it, and the wastewater discharge of the printing and dyeing industry is one of the key industries that cause water pollution in my country. Compared with other industries, printing and dyeing wastewater has a large amount of wastewater discharge , deep color, high content of refractory organic matter, unstable water quality and so on.

For the treatment of printing and dyeing wastewater, the existing treatment technologies mainly treat printing and dyeing wastewater through physical and chemical treatment and biochemical treatment in order, so as to degrade harmful substances and meet the discharge standards. For the current physical and chemical treatment of printing and dyeing wastewater, the existing physical and chemical treatment process is basically completed manually by the operator. First, the printing and dyeing wastewater is introduced into the pool. Because the pH of the printing and dyeing wastewater is uncertain, it is generally adjusted to alkaline with lime, and then ferrous sulfate is added to the wastewater for flocculation and sedimentation treatment. At present, the pre-treatment of printing and dyeing wastewater needs to judge whether there is sufficient flocculation according to the naked eye. If it is not fully flocculated, it means that there is a problem with the amount of chemicals added during the treatment process, and the adjustment is not in place. In general, adjusting the pH to 9-11 can fully flocculate, and the supernatant can be separated after passing through the sedimentation tank.

In view of the above problems, the Chinese Patent No. CN203238083U discloses a printing and dyeing wastewater treatment equipment that automatically adjusts the amount of treatment chemicals. However, in the actual treatment process, since the pH meter is inserted into the printing and dyeing wastewater, it is easy to be blocked by impurities, resulting in There is an excessive deviation between the measured value and the actual value, and the pH value is non-linear, which requires extremely high control accuracy, resulting in an unstable control system architecture.

Contents of the invention

In view of the deficiencies pointed out in the prior art, the purpose of the invention of the present invention is to provide a sampling detection device for sampling detection in the printing and dyeing wastewater treatment system. The sampling detection device first settles and separates the supernatant by sampling the printing and dyeing wastewater , and finally detect the light transmission ability of the printing and dyeing wastewater supernatant, and use the signal of light intensity as an available control signal to replace human eye observation, so as to better establish a control system for the printing and dyeing wastewater treatment system.

In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

A sampling detection device used in a printing and dyeing wastewater treatment system, the sampling detection device includes a sampling water inlet pipe, a buffer filter for removing impurities in the printing and dyeing wastewater, a flocculant adding device, and a device for detecting the light transmittance of the printing and dyeing wastewater The detection box; the output end of the sampling water inlet pipe is connected to the detection box, and the buffer filter is arranged on the sampling water inlet pipe on the front side of the detection box; the input end of the flocculant adding device is connected to the buffer filter and the sampling water inlet pipe of the detection box Above; the flocculant adding device includes a chemical mixing box, a mixer, a water valve and a chemical metering pump connected to the controller. The chemical mixing box is set above the sampling water inlet pipe, and the mixer has a constant power and can output a speed signal to the controller The motor is composed of a motor and a stirring paddle connected to the output end of the motor shaft. The motor is located outside the medicine mixing box and installed on the top of the medicine mixing box. The stirring paddle is located inside the medicine mixing box. and the mixed medicament output port, the medicament metering pump is connected to the medicament inlet, the water valve is connected to the water injection port, and the mixed medicament output port is connected to the sampling water inlet pipe; The settling device of the water pipe and the detection device used to detect the light transmittance of the printing and dyeing wastewater supernatant, both the settling device and the detection device are located in the box; wherein: the settling device includes a bottom plate, a spiral coil, an upper sealing plate and a side Sealing plate, the spiral coiled plate is longitudinally curled to form a spiral channel, the bottom plate is sealed and fixed at the lower end of the spiral coiled plate, the upper sealing plate is sealed and fixed at the upper end of the spiral coiled plate, and the side sealing plate is sealed longitudinally The outer end of the spiral coil between the bottom plate and the upper sealing plate, and seal the outer end of the spiral channel; the upper sealing plate is provided with a water inlet pipe connected to the center of the spiral channel and a supernatant outlet connected to the outer end of the spiral channel; The bottom of the side sealing plate is provided with a sedimentation outlet connected to the outer end of the spiral channel, and the sedimentation outlet extends to the outside of the box body and is used for direct discharge; the detection device for detecting the light transmittance of the printing and dyeing wastewater supernatant includes a measuring piece, The printing and dyeing wastewater inlet pipe and the printing and dyeing wastewater outlet pipe, one end of the measuring piece is provided with a light source, and the other end is provided with a light sensing element for collecting optical signals and inputting the signal to the controller in the printing and dyeing wastewater treatment system. There is an inner chamber communicating with the printing and dyeing wastewater, and the printing and dyeing wastewater inlet pipe and the printing and dyeing wastewater outlet pipe are both connected to the measuring piece and respectively communicated with the inner chamber; the supernatant outlet in the settling device is connected to the The printing and dyeing wastewater inlet pipe in the detection device for the light transmittance of the printing and dyeing wastewater supernatant.

Preferably, an inclined first transparent glass sheet is provided between the light source and the inner cavity, and an inclined second transparent glass sheet is arranged between the light sensing element and the inner cavity; the axis line of the printing and dyeing wastewater inlet pipe Corresponding to the inclined first transparent glass sheet, the axis line of the printing and dyeing wastewater outlet pipe corresponds to the inclined second transparent glass sheet.

Preferably, the detection device further includes the two-way cleaning device, and the two-way cleaning device includes a cleaning pump and a water pipe for connecting the cleaning pump to the middle of the measuring piece.

In order to solve the deficiencies in the prior art, the present invention re-improves the above-mentioned automatic control equipment for printing and dyeing wastewater treatment to avoid controlling the control point of the pH parameter, which can not only reduce the cost but also improve the stability and stability of the entire process control system. durability. In the improvement process, the existing printing and dyeing wastewater treatment system needs a device for sampling and testing the printing and dyeing wastewater, so as to establish a new control point with low cost and high precision.

Therefore, the sampling detection device adopted in the present invention first settles the sampled printing and dyeing wastewater, then separates it, separates the supernatant, and then detects the light transmission ability of the printing and dyeing wastewater supernatant, and uses the signal of light intensity as a possible The control signal used, that is, the light transmission ability of the printing and dyeing wastewater supernatant, is controlled as a new control point, and the signal of light intensity is used instead of human eye observation, so as to better establish a control system for the printing and dyeing wastewater treatment system.

In order to weaken the hysteresis of the control system to the greatest extent, the present invention has to install a flocculant adding device before the detection box. The flocculant does not change the clarity of the upper layer of sewage, but only quickly coagulates small solid particles of sewage into large particles to accelerate its precipitation. . At the same time, it is still necessary to install a settling device in the front part of the sampling and testing device, otherwise the hysteresis of the control system will be too serious, which will affect the time for the entire printing and dyeing wastewater treatment to enter a stable state. It is easy to pollute the biochemical treatment pool in the subsequent process. Using the settling device of the present invention, the printing and dyeing wastewater enters from the water inlet pipe of the settling device, passes through the spiral channel, and the spiral channel lengthens the settling distance and time of the printing and dyeing wastewater, so that the supernatant can easily flow from the supernatant at the upper end of the outer end of the spiral channel. The liquid outlet is separated, and the flocculent sediment is extruded from the sedimentation outlet at the bottom of the outer end of the spiral channel. The volume is small and the separation effect is good, which is convenient for sampling and detecting the upper liquid of the printing and dyeing wastewater.

Description of drawings

Figure 1: Schematic diagram of the signal connection between the sampling detection device and the controller in the embodiment of the present invention.

Figure 2: Schematic diagram of the structure of the detection box used to detect the transmittance of printing and dyeing wastewater in the embodiment of the present invention.

Figure 3: Schematic diagram of the three-dimensional structure of the settling device in the embodiment of the present invention.

Fig. 4: A three-dimensional cut-away schematic diagram of the settling device in the embodiment of the present invention.

Figure 5: Schematic diagram of the structure of the detection device used to detect the light transmittance of the printing and dyeing wastewater supernatant in the embodiment of the present invention.

Figure 6: Schematic diagram of the structure of the flocculant adding device in the embodiment of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

Embodiment: as shown in Figure 1, a kind of sampling detection device used in the printing and dyeing wastewater treatment system, the sampling detection device is through the sampling of printing and dyeing wastewater in the treatment system, and then the printing and dyeing wastewater that has been treated with medicine in the treatment system is processed. Settling quickly, extracting the supernatant and detecting its transmittance, providing a control signal for the controller 6 in the treatment system, instead of human eye observation, so as to better establish a control system for the printing and dyeing wastewater treatment system.

Referring to Fig. 1, the sampling detection device 5 includes a sampling water inlet pipe 51, a buffer filter 52 for removing impurities in the printing and dyeing wastewater, a flocculant adding device 53, a detection box 54 for detecting the transmittance of the printing and dyeing wastewater, and a collector. Liquid tank 57. The sampling water inlet pipe 51 is connected to the detection box 54 through the buffer filter 52. The buffer filter 52 is composed of a buffer tank and a filter screen. The filter screen is arranged in the buffer tank. Sampling outlet pipe 56 and reflux pump 58, the output end of detection box 54 is connected to sampling outlet pipe 56, and sampling outlet pipe 56 returns the tested printing and dyeing wastewater to the water supply pipe through the reflux pump 58. Of course, as shown in FIG. 1 , the buffer filter 52 in front of the filter screen can also be directly connected to the sampling outlet pipe 56 .

The input end of the flocculant adding device 53 is connected to the buffer filter 52 and the sampling inlet pipe 51 of the detection box 54. The flocculant does not change the clarity of the upper layer of the sewage, but only quickly coagulates the small solid particles of the sewage into large particles to accelerate its precipitation. .

Referring to FIG. 6 , the flocculant adding device 53 includes a chemical mixing box 531 , a mixer, a water valve 535 and a chemical metering pump 534 . The medicine mixing box 531 is arranged above the sampling water inlet pipe 51, and the mixer is composed of a motor 530 with constant power and capable of outputting a rotational speed signal and a stirring paddle 533 connected to the shaft output end of the motor 530. The motor 530 is located outside the medicament mixing box and installed on the top of the medicament mixing box 531, the stirring paddle 533 is located inside the medicament mixing box, and the stirring paddle 533 is connected to the shaft output end of the motor 530. The top of the medicament mixing box 531 is provided with a medicament inlet, its upper side is provided with a water injection port, its bottom is provided with a mixed medicament output port 532, the output end of the medicament metering pump 534 is connected to the medicament inlet, and the water valve 535 is connected to the water injection port. The mixed medicine output port 532 is connected to the sampling water inlet pipe 51 . In order to better control the amount of flocculant added, the motor 530 is connected to the controller 6 in the processing system through a signal line, and the controller 6 is connected to and controls the chemical metering pump 534 through a signal line.

During control, the calibration control speed is at the set value, and the steps to determine the set value are as follows: Because the concentration and viscosity are positively correlated, and the viscosity and resistance are inversely correlated, put in a solid agent (flocculant) to make it the target viscosity, assuming The measured rotational speed is 2000 rpm, so the set value is 2000 rpm. In the state of constant pressure and constant current, if the motor 530 drives the agitator 533 to rotate at a speed of 3000 rpm in clear water, the controller 6 will automatically turn on the control and start to control the medicament metering pump 534 to add medicament. When the speed is 2000 rpm, it means that the viscosity of the water is reduced, and the solid agent (flocculant) is automatically added to increase the viscosity. When the speed is 2000 rpm, stop adding the solid agent (flocculant); The controller 6 opens and controls the water valve 535 to add water from the water injection port.

Referring to Fig. 2, the above-mentioned detection box 54 includes a box body, a settling device 54' sequentially connected to the sampling water inlet pipe 51, and a detection device 54" for detecting the light transmittance of the printing and dyeing wastewater supernatant, the settling device 54' and the detection device 54" are in the box.

Referring to Fig. 2, Fig. 3 and Fig. 4, the role of the settling device 54' is to quickly settle the solids in the sewage to separate the sewage supernatant, which is convenient for the subsequent detection device for detecting the light transmittance of the printing and dyeing wastewater supernatant 54" for light transmittance testing, which includes a bottom plate 1', a spiral coil 2', an upper seal 3' and a side seal 21'. The spiral coil 2' is longitudinally curled, and its cross-section is a mosquito coil spiral. A spiral channel 20' is formed in the spiral coil 2', and the two ends of the spiral coil 2' are flush. The above-mentioned bottom plate 1' is sealed and fixed at the lower end of the spiral coil 2', and the bottom plate 1' and the spiral coil The lower end of 2' is detachably fixed, the upper sealing plate 3' is sealed and fixed on the upper end of the spiral coiling plate 2', and the side sealing plate 21' is longitudinally sealed on the spiral coiling plate 2' between the bottom plate 1' and the upper sealing plate 3' outer end, and seal the outer end 20b' of the spiral channel. The center of the upper sealing plate 3' is provided with a water inlet pipe 4' for connecting printing and dyeing wastewater, and the water inlet pipe 4' communicates with the center of the spiral channel 20a', and the upper sealing plate 3' One edge is provided with a supernatant outlet 5', and the supernatant outlet 5' is connected to the outer end of the spiral channel 20'. The bottom of the side sealing plate 21' is provided with a sedimentation outlet 6' connected to the outer end of the spiral channel 20'. For better sealing and fixing, the above-mentioned side sealing plate 21' is connected with the outer end of the spiral coiling plate 2' as a whole.

Referring to Fig. 5, the detection device 54" for detecting the light transmittance of the printing and dyeing wastewater supernatant is composed of a measuring piece 2", a bidirectional cleaning device 4", a printing and dyeing wastewater inlet pipe 1" and a printing and dyeing wastewater outlet pipe 3". The measuring piece 2" is the main body of the detection device, the measuring piece 2" is hollow, a light source 21" is provided at one end of the measuring piece 2", and a light sensing element 22" is provided at the other end inside. Between the light source 21" and the photosensitive element 22", there is an inner cavity 20" communicating with printing and dyeing wastewater. The light source 21" isolates the inner cavity 20" through the inclined first transparent glass sheet 210", and the light sensing element 22" passes through the inclined second transparent glass sheet 210". The transparent glass sheet 220 "isolates the inner cavity 20". The above-mentioned printing and dyeing wastewater inlet pipe 1" measures the part 2" from below and communicates with the above-mentioned inner cavity 20"; the printing and dyeing wastewater outlet pipe 3" connects the measuring part 2" from above and communicates with the above-mentioned inner cavity Cavity 20". The above-mentioned two-way cleaning device 4" is composed of a cleaning pump 55 and a water pipe connecting the cleaning pump 55 and the middle part of the measuring piece inner chamber 20". Specifically, the axis line of the above-mentioned printing and dyeing wastewater inlet pipe 1" corresponds to the first inclined In the middle area of the transparent glass sheet 210", the angle between the axis line of the printing and dyeing wastewater inlet pipe 3" and the inclined first transparent glass sheet 210" is between 15-40 degrees. The axis of the printing and dyeing wastewater outlet pipe 3" The line corresponds to the middle area of the inclined second transparent glass sheet 220", and the included angle between the axis line of the printing and dyeing wastewater outlet pipe 1" and the inclined second transparent glass sheet 220" is between 15-40 degrees. In this way The purpose of setting is to prevent the first transparent glass sheet 210" from being easily fouled when the water flow impacts the first transparent glass sheet 210" when the printing and dyeing wastewater enters the water pipe 1", and the second transparent glass sheet The sheet 220" can also withstand the water flow from the inner cavity 20", which is not easy to accumulate dirt, maintains the transparency of the first transparent glass sheet 210" and the second transparent glass sheet 220", and improves the accuracy of detection.

After describing in detail the above-mentioned settling device 54' and the detection device 54" for detecting the light transmittance of the printing and dyeing wastewater supernatant, the water inlet pipe 4' in the above-mentioned settling device 54' is connected to the output end of the sampling water inlet pipe 51, and the settling device 54 The supernatant outlet 5' in 'is connected to the printing and dyeing wastewater inlet pipe 1" in the detection device 54" for detecting the light transmittance of the printing and dyeing wastewater supernatant, and the printing and dyeing wastewater outlet pipe 3" in the detection device 54" can be connected to Return the sampling outlet pipe 56, and the sedimentation outlet 6' in the settling device 54' is directly discharged.

Claims (3)

1. one kind for the sampling detecting device in printing and dyeing wastewater treatment system, it is characterised in that: described sampling detecting device (5) comprises sampling water inlet pipe (51), for rejecting the buffering filter (52) of foreign material in dyeing waste water, flocculation agent adding apparatus (53) and the detection box (54) for detecting dyeing waste water transparence; Sampling water inlet pipe (51) output terminal joint detection box (54), described buffering filter (52) is arranged on the sampling water inlet pipe (51) of detection box (54) front side;Buffering filter (52) is made up of surge tank and filtering net, and filtering net is located in surge tank;

-described flocculation agent adding apparatus (53) input terminus is connected on the sampling water inlet pipe (51) of buffering filter (52) and detection box (54), described flocculation agent adding apparatus (53) comprises medicament blending bin (531), stirrer, water valve (535) and drug metering pump (534), described medicament blending bin (531) is located at sampling water inlet pipe (51) top, stirrer by power invariability and can output speed signal motor (530) and connection motor (530) axle output terminal stirring rake (533) form, described motor (530) is in outside medicament blending bin and is arranged on medicament blending bin (531) top, stirring rake (533) is in inside medicament blending bin, medicament blending bin (531) is provided with medicament and adds entrance, water filling mouth and confection delivery port (532), drug metering pump (534) connects medicament and adds entrance, water valve (535) connects water filling mouth, confection delivery port (532) connects sampling water inlet pipe (51), described motor (530) signal connection control case (6), controlling box (6) signal connects and controls described drug metering pump (534),

-described detection the box (54) for detecting dyeing waste water transparence comprises box body, sedimentation device (54 ��) and the detection device (54 ��) for detecting dyeing waste water supernatant transparent luminosity, sedimentation device (54 ��) and detection device (54 ��) are all in box body, and sampling water inlet pipe (51) connects sedimentation device (54 ��) and detection device (54 ��) successively;

Wherein:

I () described sedimentation device (54 ��) comprises base plate (1 ��), spiral volume plate (2 ��), upper sealing plate (3 ��) and side seal board (21 ��), described spiral volume plate (2 ��) longitudinal curl also forms helical channel (20 ��), described base plate (1 ��) sealing is fixed on the lower end of described spiral volume plate (2 ��), upper sealing plate (3 ��) sealing is fixed on described spiral volume plate (2 ��) upper end, spiral volume plate (2 ��) outer end of side seal board (21 ��) longitudinal sealing between base plate (1 ��) and upper sealing plate (3 ��), and helical channel outer end (20b ��) is sealed, described upper sealing plate (3 ��) is provided with the inhalent siphon (4 ��) and the supernatant liquor water outlet (5 ��) being connected helical channel (20 ��) outer end that are connected helical channel center (20a ��), described side seal board (21 ��) bottom is provided with the precipitation extrusion (6 ��) being connected helical channel (20 ��) outer end, and precipitation extrusion (6 ��) is stretched to the external side of box and in order to direct discharge,

(ii) measuring piece (2 ��) is comprised for detecting the detection device (54 ��) of dyeing waste water supernatant transparent luminosity described in, dyeing waste water water inlet pipe (1 ��) and dyeing waste water rising pipe (3 ��), described measuring piece (2 ��) inner opposite end is provided with light source (21 ��), the other end is provided with for gathering optical signal and signal inputs to the photoinduction element (22 ��) of printing and dyeing wastewater treatment system middle controller, the inner chamber (20 ��) being connected dyeing waste water it is provided with between light source (21 ��) and photoinduction element (22 ��), described dyeing waste water water inlet pipe (1 ��) all connects measuring piece (2 ��) with dyeing waste water rising pipe (3 ��) and is connected described inner chamber (20 ��) respectively,

Supernatant liquor water outlet (5 ��) in described sedimentation device (54 ��) connects described for the dyeing waste water water inlet pipe (1 ��) in the detection device (54 ��) detecting dyeing waste water supernatant transparent luminosity.

2. according to claim 1 a kind of for the sampling detecting device in printing and dyeing wastewater treatment system, it is characterized in that: the first transparent glass sheet (210 ��) being provided with inclination between described light source (21 ��) and inner chamber (20 ��), between described photoinduction element (22 ��) and inner chamber (20 ��), it is provided with the 2nd transparent glass sheet (220 ��) of inclination;On corresponding the first transparent glass sheet (210 ��) tilting of described dyeing waste water water inlet pipe (1 ��) axial line, on corresponding the 2nd transparent glass sheet (220 ��) tilting of described dyeing waste water rising pipe (3 ��) axial line.

3. according to claim 2 a kind of for the sampling detecting device in printing and dyeing wastewater treatment system, it is characterized in that: the described detection device (54 ��) for detecting dyeing waste water supernatant transparent luminosity also comprises bidirectional cleaning device (4 ��), described bidirectional cleaning device (4 ��) comprise scavenging pump (55) and for connect scavenging pump (55) and described measuring piece (2 ��) middle part water pipe.