CN111289339A - Water sample pretreatment method and pretreatment system - Google Patents
Water sample pretreatment method and pretreatment system Download PDFInfo
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- CN111289339A CN111289339A CN202010212462.5A CN202010212462A CN111289339A CN 111289339 A CN111289339 A CN 111289339A CN 202010212462 A CN202010212462 A CN 202010212462A CN 111289339 A CN111289339 A CN 111289339A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a water sample pretreatment method and a pretreatment system, wherein an inner cavity of a treatment bin is divided into a liquid bin, a settling bin, a floating bin and a suspension bin, so that settleable particles, suspended particles and floatable fibrous floating particles in a water sample can be separated, the settleable particles are discharged from a continuous sand discharge port after being settled, the floating particles are discharged from a liquid outlet along with water flow after being floated, and the suspended particles are filtered by a filter, so that the water sample only contains trace micro particles, the maintenance cost of a water sample analyzer is reduced, and the service life of the water sample analyzer is prolonged. After the water sample collection is finished, the external light type metal filtering membrane pipe can be directionally cleaned from inside to outside by utilizing the backwashing mechanism, and qualified water sample and absorption are further ensured by backwashing in each circulation process. The purification treatment for obtaining the water sample in the earlier stage is combined, the steps and the cost of the advanced treatment can be simplified, and the purified water obtained by the advanced treatment can be used as cleaning water or water for preparing reagents.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a water sample pretreatment method and a pretreatment system.
Background
The water quality monitoring is a process of monitoring and measuring the types of pollutants in the water body, the concentrations and the variation trends of various pollutants and evaluating the water quality condition. When the water quality monitor in the prior art carries out on-line monitoring on a high-turbidity water sample, more and larger settleable particles such as gravels and the like, suspended particles similar to the density of the water sample and floatable fibrous floating particles exist in the detected water sample, and especially in sewage treatment plants, hospital-derived sewage and production sewage of textile, printing and dyeing, papermaking and the like, the object impurities in the water sample not only affect the measurement index of the water quality, but also threaten an analytical and measurement instrument, and reduce the service life of the analytical and measurement instrument.
Some methods such as MBR membrane method and mechanical filter screen filter are used on site to filter large particles and suspended matters, the effect is poor due to lack of automatic maintenance, and frequent maintenance is required for field personnel.
In addition, in some water supply and drainage engineering designs, sewage/purified water pipelines are not allowed to be installed at the same position on a sewage site, and need to be spaced at a certain distance to prevent accidental pollution of tap water sources. Because a purified water source cannot be obtained on site, the operation of site maintenance personnel is inconvenient.
Disclosure of Invention
The invention aims to provide a water sample pretreatment method and a pretreatment system, which can remove solid particles in a detected water sample on line, keep the analysis index of an instrument in water unchanged, automatically clean and maintain the instrument, and provide clean water on site in a sewage pipeline.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a water sample pretreatment method is characterized by comprising the following steps:
A. removal of particulate matter
a1. Leading out a water sample in a pipeline on line, layering the water body by reducing the flow velocity of the led-out water body, sinking and discharging settleable particles in the water body, and floating the floatable particles in the water body to be discharged along with the continuous entering of the water body;
a2. filtering suspended particles contained in the water body through an external light type metal filtering membrane tube;
B. removing the particulate matters in the water body, and introducing a part of the water as a water sample to a water quality analyzer for detection; the other part enters deep treatment;
C. obtaining pure water through advanced treatment, and using the pure water for preparing a reagent on site;
D. and (4) maintaining the system, and performing back flushing on the external light type metal filtering membrane tube from inside to outside.
The further technical scheme is that a first stage of filtration of suspended particles contained in the water body is also included before the step a2, so as to remove large suspended particles.
The water sample pretreatment system is applied to the water sample pretreatment method, comprises a treatment bin and is characterized in that:
the inner cavity of the treatment bin is divided into:
the liquid separation bin is close to one end of the liquid inlet of the treatment bin and is vertically arranged, so that settleable particles in the liquid can sink and floating particles can float;
the sedimentation bin is of a funnel structure, the upper end of the sedimentation bin is communicated with the lower end of the liquid separation bin, and the bottom of the sedimentation bin is provided with a continuous sand discharge port which can collect and discharge sedimentation particles;
the floating bin is horizontally arranged, one end of the floating bin is communicated with the upper end of the liquid separating bin, the other end of the floating bin is communicated with the liquid outlet of the treatment bin, a filter plate capable of blocking floating particulate matters from passing through is arranged at the bottom of the floating bin, and the floating particulate matters in the floating bin can be discharged from the liquid outlet along with the rise of the liquid level;
the suspension bin is positioned below the filter plate and communicated with the settling bin, and the bottom of the suspension bin is provided with an emptying pipe of an emptying valve;
the water sample filtering device further comprises:
the external light type metal filtering membrane tube is vertically arranged in the suspension bin;
the device comprises a water sample collecting pipe, a water outlet pipe, a reagent preparing water pipe and a water outlet pipe, wherein a water sample collecting pump is arranged on the water sample collecting pipe, one end of the water sample collecting pipe is hermetically connected with the liquid outlet end of an external light type metal filtering membrane pipe, the other end of the water sample collecting pipe is provided with the water sample outlet pipe and the reagent preparing water pipe which are connected in parallel, and an advanced treatment mechanism for carrying out advanced treatment on a water body to obtain pure water is;
one maintenance pipe is arranged in the water sample collecting pipe and is provided with an annular gap between the maintenance pipe and the water sample collecting pipe, one end of the maintenance pipe is positioned in the external light type metal filtering membrane pipe, and the external light type metal filtering membrane pipe is connected with a back washing mechanism for maintaining the external light type metal filtering membrane pipe.
The further technical scheme is as follows: divide the storehouse to include:
and the dividing plate is vertically arranged, the front end and the rear end of the dividing plate are fixed with the treatment bin, a liquid passing gap is formed between the upper end and the lower end of the dividing plate and the bin body, the dividing plate is of an obtuse angle structure, the opening end of the dividing plate faces the liquid inlet, and the liquid inlet corresponds to the middle of the dividing plate.
The further technical scheme is as follows: the water sample filtering device further comprises:
the filtering bin is sleeved outside the external light type metal filtering membrane in a closed manner, filtering holes for primarily filtering suspended particles are formed in the filtering bin, and a one-way water-stop plate capable of being opened when the backwashing mechanism works is arranged at the bottom of the filtering bin.
The further technical scheme is as follows: the filter bin comprises an outer bin body and an inner bin body which are sleeved, the outer bin body and the inner bin body are fixed with the maintenance pipe, a space is reserved between the outer bin body and the inner bin body, and upper end faces of the outer bin body and the inner bin body are provided with filtering holes which are staggered up and down.
The further technical scheme is as follows: the upper end surfaces of the outer bin body and the inner bin body are both slope surfaces which incline downwards.
The further technical scheme is as follows: the back flush mechanism includes:
the air outlet end of the air storage part is hermetically connected with the maintenance pipe;
an air pump for inflating the air storage part;
a first pressure sensor for detecting the internal pressure of the gas storage part;
the first control valve is used for controlling the gas storage part to release gas with positive pressure;
and the signal input end of the first controller is connected with the first pressure sensor, and the control output end of the first controller is connected with the first control valve and the air pump.
The further technical scheme is as follows: the back flush mechanism includes:
the water inlet end of the liquid storage tank is connected with a water source through a pipe body, and a water pump is arranged on the pipe body;
the air bag is in an expanded state after air storage, is arranged in the liquid storage tank and has a liquid storage space with the liquid storage tank;
the second pressure sensor is used for detecting the internal pressure of the liquid storage tank;
the second control valve is used for controlling the liquid outlet end of the liquid storage tank to release the liquid with positive pressure;
and the signal input end of the second controller is connected with the second pressure sensor, and the control output end of the second controller is connected with the second control valve and the water pump.
The further technical scheme is as follows: the diapire of suspension storehouse is decurrent cone structure, the bottommost below of diapire is located to the blow-down pipe.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
according to the water sample pretreatment method and the pretreatment system, the inner cavity of the treatment bin is divided into the liquid bin, the settling bin, the floating bin and the suspension bin, settled particles, suspended particles and floatable fibrous floating particles in a water sample can be separated, the settled particles are discharged from the continuous sand discharge port after settling, the floating particles are discharged from the liquid outlet along with water flow after floating, and the suspended particles are filtered by the filter, so that most of solid impurities contained in the water sample can be removed, only trace micro particles are contained, the maintenance cost of the water sample analyzer is reduced, and the service life of the water sample analyzer is prolonged.
In addition, because the external light type metal filtering membrane tube is adopted as a device for filtering suspended particles in the filtering device, the structural characteristics of the external light type metal filtering membrane tube are utilized, after water sample collection is completed, the external light type metal filtering membrane tube can be directionally cleaned from inside to outside by utilizing a back washing mechanism, and qualified water sample and absorption are further ensured by back washing in each cycle process.
The technology also has the advantages that the advanced treatment of the water body is realized, the impurity removal treatment for obtaining a water sample in the earlier stage is combined, the steps and the cost of the advanced treatment can be simplified, the bacteria, algae, organic matters, metal ions and inorganic salt ions in the water body are removed through the advanced treatment to obtain the purified water, the purified water can be used as cleaning water or reagent preparation water, the regulation that a sewage/purified water pipeline is not allowed to be installed at the same position on a sewage site is not violated, the purified water can be provided on the sewage site, the use requirement of a working environment is met, and the operation of a site maintainer is facilitated.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the backwash mechanism (air wash) in the present invention;
FIG. 3 is another schematic structural view (water washing) of the backwashing mechanism according to the present invention;
fig. 4 is a schematic structural view of the one-way water-stop sheet of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Example one
A water sample pretreatment method comprises the following steps:
A. removal of particulate matter
a1. Leading out a water sample in a pipeline on line, layering the water body by reducing the flow velocity of the led-out water body, sinking and discharging settleable particles in the water body, and floating the floatable particles in the water body to be discharged along with the continuous entering of the water body;
a2. filtering suspended particles contained in the water body through an external light type metal filtering membrane tube;
B. removing the particulate matters in the water body, and introducing a part of the water as a water sample to a water quality analyzer for detection; the other part enters deep treatment;
C. obtaining pure water through advanced treatment, and using the pure water for preparing a reagent on site;
D. and (4) maintaining the system, and performing back flushing on the external light type metal filtering membrane tube from inside to outside.
In order to implement the above water sample pretreatment method, the embodiment further includes a water sample pretreatment system.
The on-line filtering device comprises a processing bin 100, wherein a liquid inlet of the processing bin 100 is connected with a pipeline, and a liquid outlet is emptied. The inner cavity of the treatment bin 100 is divided into a liquid separating bin 101, a settling bin 102, a floating bin 103 and a suspending bin 104, and settled particles and floating fibrous floating particles in a water body can be removed.
The liquid separating bin 101 is close to one end of the liquid inlet of the treating bin 100 and is vertically arranged, so that settleable particles in liquid can sink and floating particles can float.
The sedimentation bin 102 is of a funnel structure, the upper end of the sedimentation bin is communicated with the lower end of the liquid separation bin 101, and the bottom of the sedimentation bin is provided with a continuous sand discharge port which can collect and discharge sedimentation particles.
Float storehouse 103 level setting, its one end and divide the upper end intercommunication in storehouse 101, the other end intercommunication handles the liquid outlet in storehouse 100, the bottom of floating storehouse 103 is equipped with the filter 105 that can the separation float the particulate matter and pass through, floats the particulate matter in the storehouse 103 and can be followed the liquid level and rise by the liquid outlet discharge.
The suspension bin 104 is positioned below the filter plate 105 and is communicated with the settling bin 102, and the bottom of the suspension bin 104 is provided with an emptying pipe 106 of an emptying valve.
The water sample filtering device further comprises an external light type metal filtering film tube 200, a water sample collecting tube 300 and a maintenance tube 400.
In suspension storehouse 104 is vertically arranged in to external light type metal filter membrane pipe 200, through the filtration of external light type metal filter membrane pipe 200 to the water, can get rid of the suspended particles in the water sample.
The water sampling pipe 300 is provided with a water sampling pump 301, one end of the water sampling pipe 300 is hermetically connected with the liquid outlet end of the external light type metal filtering membrane pipe 200, the other end of the water sampling pipe is provided with a water sample measuring outlet pipe 302 and a reagent preparing water pipe 303 which are connected in parallel, and the reagent preparing water pipe 303 is provided with an advanced treatment mechanism 700 for performing advanced treatment on water to obtain pure water.
The maintenance pipe 400 is arranged in the water sample collection pipe 300, an annular gap is formed between the maintenance pipe 400 and the water sample collection pipe 300, one end of the maintenance pipe 400 is positioned in the external light type metal filtering membrane pipe 200, and the other end of the maintenance pipe is connected with a back washing mechanism 500 for maintaining the external light type metal filtering membrane pipe 200.
A water sample enters the liquid separation bin 101 from a liquid inlet of the treatment bin 100, a buffer space is arranged at the connection position of the liquid separation bin 101 and the inlet, the space caliber of the buffer space is more than 5 times of that of the liquid inlet, the flow speed of the liquid is rapidly slowed down after the liquid enters the buffer space, the liquid is divided into 3 liquid layers in the buffer space according to the different densities of particles in the liquid, and the liquid layers are respectively water layers containing settleable particles, suspended particles and floatable fibrous floating particles from bottom to top.
Since the liquid will continuously enter, the layered liquid will be pushed to the next stage. The floatable fibrous floating particles are pushed into the upper floating bin 103 and discharged out of the treatment bin 100 after reaching the liquid outlet. The settleable particles are pushed into the settling bin 102 below, the settling bin 102 is of a funnel type structure, the settleable particles are collected into the settling bin, a liquid outlet of a funnel type bin body of the settling bin is upwards opened to prevent the settleable particles from running out of the bin body, a contact sand discharge port is arranged at the bottom of the bin body, the aperture of the contact sand discharge port is not larger than one half of that of a liquid inlet, and the settleable particles are prevented from accumulating in the bin body. Thereby being capable of removing settleable particles and floating particles in the water body.
The inside impurity of water that gets into in the suspension storehouse 104 is mostly the suspended particle, when needs gather the water sample, starts water sample collection pump 301, and the water sample that is surveyed gets into water sample collection pipe 300 after the external light type metal filter membrane pipe 200 filters the suspended particle, and a part water is discharged from measuring water sample outlet pipe 302 as the water sample and is gone into the water quality testing appearance and carry out the analysis. Through the filtration of the device, can get rid of most solid impurity that contains in the water sample, only contain micro small particulate matter, obtain the water sample that satisfies the measuring instrument.
The other part of the water enters a reagent preparation water pipe 303, is treated by an advanced treatment mechanism 700, and is discharged pure water which is used as cleaning water or water for preparing reagents. In the embodiment, the advanced treatment of the water body is combined with the impurity removal treatment for obtaining the water sample in the earlier stage, so that the steps and the cost of the advanced treatment can be simplified, the bacteria, algae, organic matters, metal ions and inorganic salt ions in the water body are removed through the advanced treatment to obtain the purified water, the purified water can be used as the cleaning water or the water for preparing reagents, the regulation that the sewage/purified water pipeline is not allowed to be installed at the same position on the sewage site is not violated, the purified water can be provided on the sewage site, the use requirement of the working environment is met, and the operation of the site maintainer is.
After the water sample collection is completed, the external light type metal filtering membrane tube 200 can be directionally cleaned from inside to outside by using the backwashing mechanism 500, and the backwashing in each cycle process further ensures qualified water sample and absorption.
The on-line filtering method and the pretreatment system for water sample monitoring can separate settleable particles, suspended particles and floatable fibrous floating particles in a water sample by dividing the inner cavity of the treatment bin 100 into the liquid bin 101, the settling bin 102, the floating bin 103 and the suspending bin 104, the settleable particles are discharged from a continuous sand discharge port after being settled, the floating particles are discharged from a liquid outlet along with water flow after being floated, and the suspended particles are filtered by the filter, so that most of solid impurities contained in the water sample can be removed, only trace micro particles are contained, the maintenance cost of the water sample analyzer is reduced, and the service life of the water sample analyzer is prolonged.
Example two
Based on the first embodiment, the advanced treatment is the same as the advanced treatment of water in the prior art, and can be selected and combined according to pollutant components contained in the water body. The depth processing may include:
c1. ultraviolet irradiation is carried out to inactivate bacteria. Ultraviolet irradiation is widely used in water treatment, and 254nm ultraviolet light emitted from a low pressure mercury lamp is an effective sterilization method because DNA and proteins in bacteria absorb ultraviolet light and die.
c2. And performing deep filtration treatment on the water body by using an ultrafiltration membrane to remove colloids, suspended solids, particulate matters and the like in the water body. Ultrafiltration (UF) is a filtration term that refers to a filter that removes particles, such as protein-sized particles. The pore diameter of the membrane is usually between 1 and 50nm, the ultrafiltration membrane with a hollow fiber structure usually has a high filtration rate, and the ultrafiltration membrane is a strong, thin and selectively permeable membrane which can retain most of molecules with more than a certain specific size and comprises: gums, microorganisms, and heat sources.
c3. The active carbon is used for adsorbing nonionic organic matters and free chlorine in the water body. The adsorption process of the activated carbon is achieved by utilizing the pore size of the activated carbon filter and the permeability of the organic matter through the pores. The adsorption rate is related to the molecular weight and the molecular size of organic matters, and certain granular activated carbons can effectively remove chloramine. Activated carbon also removes free chlorine from the water to protect other purification units within the pure water system that are sensitive to oxidants. Activated carbon is typically used in combination with other treatment methods.
c4. The RO membrane is used for removing microorganisms such as bacteria and inorganic substances such as iron, manganese, silicon and the like. The Reverse Osmosis (RO) method is the most economical method for achieving 90% to 99% impurity removal. The RO membrane has a dense pore structure compared with UF membrane, and can remove all particles, bacteria and organic substances with molecular weight more than 300 (including heat source). The RO membrane has a dense pore structure compared with UF membrane, and can remove all particles, bacteria and organic substances with molecular weight more than 300 (including heat source). RO is the most economical and effective method for purifying tap water after proper treatment based on the quality of raw water and the quality of produced water. RO is also the best pretreatment method for a reagent-grade pure water system.
c5. And removing residual inorganic salt ions in the water body by using ion exchange resin. The ion exchange resin exchanges cations with hydrogen ions and exchanges anions with hydroxide ions; cation exchange resins made from sulfonate-containing styrene and divinylbenzene exchange hydrogen ions for various cations encountered, such as Na+、Ca2+、Al3+. Similarly, anion exchange resins made with styrene containing quaternary ammonium salts will exchange hydroxide ions for various anions encountered, such as Cl-. The hydrogen ions released from the cation exchange resin combine with the hydroxide ions released from the anion exchange resin to produce pure water.
In order to realize the above advanced treatment, in the present embodiment, the advanced treatment mechanism 700 includes a degerming and algae-killing pond, an ultrafiltration membrane, an activated carbon adsorption tank, an RO membrane and an exchange resin column, and is selected and combined according to the components of the impurities in the water body.
EXAMPLE III
Based on the first embodiment, a first stage of filtering the suspended particles contained in the water body is further included before the step a2, so as to remove the large suspended particles.
The water sample filtering device further comprises a filtering bin 600 which is sleeved outside the external light type metal filtering membrane pipe 200 in a closed manner and used for primarily filtering suspended particles and protecting the external light type metal filtering membrane pipe 200, and a one-way water-stop plate 603 which can be opened when the backwashing mechanism 500 works is arranged at the bottom of the filtering bin 600.
As shown in fig. 4, one end of the one-way water stop plate 603 at one end of the one-way water stop plate 603 is hinged to the bin body, a tension spring 604 is fixed between the inner side of the water stop plate 603 and the inner wall of the bin body, when the backwashing mechanism 500 works, high-pressure gas or liquid overcomes the tension force of the clamp spring 604 and pushes the one-way water stop plate 603 to be opened outwards, and after the backwashing is finished, the one-way water stop plate 603 is closed under the action of the tension spring 604 to realize one-way opening and closing.
The filter bin 600 is configured to remove the remaining settleable particles and floatable fibrous floating particles in the water sample, and remove larger floating particles to avoid blocking the external light metal filter membrane tube 200. After entering the filtering bin 600 for filtering, the external light type filter only removes smaller suspended particles in the water sample, so as to ensure that the water sample meeting the measuring instrument is obtained.
The bottom of the filter bin 600 is provided with a one-way water stop sheet 603, when the device is back flushed, the one-way water stop sheet 603 is opened outwards under the action of forward pressure, impurities stripped from the interior of the filter bin 600 and the exterior metal filter membrane tube 200 are discharged to the suspension bin 104, and are discharged by opening the emptying valve, so that the next water sample is clean.
Example four
Based on the third embodiment, the filtering bin 600 comprises an outer bin body 601 and an inner bin body 602 which are sleeved, the outer bin body 601 and the inner bin body 602 are both fixed with the maintenance pipe 400, a space is formed between the outer bin body 601 and the inner bin body 602, and filtering holes which are staggered up and down are formed in the upper end surfaces of the outer bin body 601 and the inner bin body 602.
Through staggering the filtration pore on outer storehouse body 601 and the interior storehouse body 602 from top to bottom, through the cross-flow, make the granule that can subside that gets into through outer storehouse body 601, vertical whereabouts under the effect of gravity, do not offer the filtration pore on the interior storehouse body 602 that corresponds to can keep off the granule that can subside outside the storehouse body 602. In addition, floating and suspended particles can be prevented from entering the bin body through the filtering function of the filtering holes.
EXAMPLE five
Based on the fourth embodiment, the upper end surfaces of the outer bin 601 and the inner bin 602 are both slope surfaces which are inclined downwards. The falling particles can slide down along the slope surface and can not enter the filter cabin.
EXAMPLE six
According to one embodiment of the disclosure, the liquid-separating chamber 101 includes a dividing plate 107, which is vertically disposed, the front and rear ends of the dividing plate are fixed to the processing chamber 100, a liquid-passing gap is provided between the upper and lower ends and the chamber body, the dividing plate 107 has an obtuse angle structure, the opening end of the dividing plate faces the liquid inlet, and the liquid inlet corresponds to the middle of the dividing plate 107.
The inlet corresponds to the middle part of cutting board 107 for the water sample gets into the back and has the biggest buffering space in minute liquid storehouse 101, and the velocity of flow of at utmost reduction water sample makes its layering. The two ends of the partition plate 107 respectively contract towards the upper end and the lower end and are close to the inner wall of the treatment bin 100, so that the layered liquid quickly enters the bin body at the later stage.
EXAMPLE seven
According to one embodiment of the disclosure, the backwashing mechanism 500 is air-washed, and specifically includes an air storage portion 501, an air pump 502, a first pressure sensor, a first control valve 503 and a first controller, wherein the air storage portion 501 may be an air storage tank or an air storage bag 506.
The air outlet end of the air storage part 501 is hermetically connected with the maintenance pipe 400, the air pump 502 inflates air to the air storage part 501, the first pressure sensor can be arranged on the air storage part 501 and used for detecting the internal pressure of the air storage part, the first control valve 503 is used for controlling the air of the air storage part 501 to release positive pressure, the signal input end of the first controller is connected with the first pressure sensor, and the control output end of the first controller is connected with the first control valve 503 and the air pump 502.
When reverse air washing is performed, the first control valve 503 is closed, the air pump 502 inflates air into the air storage portion 501, the first pressure sensor monitors the pressure of the air storage portion 501 in real time and transmits the monitored information to the first controller, and when the pressure in the air storage portion 501 reaches a set value, the first controller controls the air pump 502 to stop working and opens the first control valve 503. At this time, the high-pressure forward gas released from the gas storage 501 reversely washes the external light type metal filtering membrane tube 200 through the maintenance tube 400. The impurities attached to the outer surface of the external light type metal filtering membrane tube 200 in the water pumping process are quickly and reversely peeled off and pushed to the outside of the external light type metal filtering membrane tube 200, and the cleaning is completed for the next water pumping. Because the filter is of a single-end smooth surface type, directional cleaning from inside to outside can be formed, and backwashing in each circulation process ensures qualified water sample and absorption.
In addition, the pressure during air washing can reach a set value through the air storage of the air storage part 501, and the washing effect is good.
Example eight
According to one disclosed embodiment, the backwash mechanism 500 is water washed, and the backwash mechanism 500 includes a reservoir 504, a bladder 506, a second pressure sensor, a second control valve 507, and a second controller.
The water inlet end of the liquid storage tank 504 is connected with a water source through a pipe body, the pipe body is provided with a water pump 505 and an air bag 506 which are in an expansion state after air storage, the water pump is arranged in the liquid storage tank 504, a liquid storage space is arranged between the water pump and the liquid storage tank 504, a second pressure sensor can be arranged in the liquid storage tank 504 and used for detecting the internal pressure of the liquid storage tank 504, a second control valve 507 is used for controlling the liquid outlet end of the liquid storage tank 504 to release forward pressure liquid, the signal input end of a second controller is connected with the second pressure sensor, and the control output end is connected with the second control.
When reverse washing is performed, the second control valve 507 is closed, the water pump 505 pumps water into the liquid storage tank 504, the second pressure sensor monitors the liquid pressure in the liquid storage tank 504 in real time and transmits monitored information to the second controller, and when the pressure in the gas storage portion 501 reaches a set value, the second controller controls the water pump 505 to stop working and opens the second control valve 507. At this time, the high-pressure liquid in the forward direction released from the liquid storage tank 504 reversely washes the external light type metal filtering film pipe 200 through the maintenance pipe 400.
The impurities attached to the outer surface of the external light type metal filtering membrane tube 200 in the water pumping process are quickly and reversely peeled off and pushed to the outside of the external light type metal filtering membrane tube 200, and the cleaning is completed for the next water pumping. Because the filter is of a single-end smooth surface type, directional cleaning from inside to outside can be formed, and backwashing in each circulation process ensures qualified water sample and absorption.
Example nine
According to the disclosed embodiment, the bottom wall of the suspension cabin 104 is in a downward cone structure, and the vent pipe 106 is arranged at the lowest part of the bottom wall. The arrangement of the cone structure is beneficial to the evacuation of the suspension cabin 104.
The above is only a preferred embodiment of the invention, and any simple modifications, variations and equivalents of the invention may be made by anyone in light of the above teachings and fall within the scope of the invention.
Claims (10)
1. A water sample pretreatment method is characterized by comprising the following steps:
A. removal of particulate matter
a1. Leading out a water sample in a pipeline on line, layering the water body by reducing the flow velocity of the led-out water body, sinking and discharging settleable particles in the water body, and floating the floatable particles in the water body to be discharged along with the continuous entering of the water body;
a2. filtering suspended particles contained in the water body through an external light type metal filtering membrane tube;
B. removing the particulate matters in the water body, and introducing a part of the water as a water sample to a water quality analyzer for detection; the other part enters deep treatment;
C. obtaining pure water through advanced treatment, and using the pure water for preparing a reagent on site;
D. and (4) maintaining the system, and performing back flushing on the external light type metal filtering membrane tube from inside to outside.
2. The water sample pretreatment method as claimed in claim 1, further comprising a first stage filtration of suspended particles contained in the water body to remove large suspended particles before step a2.
3. A water sample pretreatment system for use in the water sample pretreatment method as claimed in claim 1, comprising a treatment chamber (100), wherein:
the inner cavity of the treatment bin (100) is divided into:
a liquid separation bin (101) which is close to one end of the liquid inlet of the treatment bin (100) and is vertically arranged, so that settleable particles in the liquid can sink and floating particles can float;
the sedimentation bin (102) is of a funnel structure, the upper end of the sedimentation bin is communicated with the lower end of the liquid separation bin (101), and the bottom of the sedimentation bin is provided with a continuous sand discharge port which can collect and discharge sedimentation particles;
the floating bin (103) is horizontally arranged, one end of the floating bin is communicated with the upper end of the liquid separating bin (101), the other end of the floating bin is communicated with the liquid outlet of the processing bin (100), a filter plate (105) capable of blocking floating particulate matters from passing through is arranged at the bottom of the floating bin (103), and the floating particulate matters in the floating bin (103) can be discharged from the liquid outlet along with the rise of the liquid level;
the suspension bin (104) is positioned below the filter plate (105) and is communicated with the sedimentation bin (102), and the bottom of the suspension bin (104) is provided with an emptying pipe (106) of an emptying valve;
the water sample filtering device further comprises:
the external light type metal filtering membrane tube (200) is vertically arranged in the suspension bin (104);
the device comprises a water sample collecting pipe (300), a water sample collecting pump (301) is arranged on the water sample collecting pipe, one end of the water sample collecting pipe (300) and the liquid outlet end of an external light type metal filtering membrane pipe (200) are hermetically connected with the external light type metal filtering membrane pipe (200), the other end of the water sample collecting pipe is provided with a water sample measuring outlet pipe (302) and a reagent preparation water pipe (303) which are connected in parallel, and an advanced treatment mechanism (700) for carrying out advanced treatment on a water body to obtain pure water is arranged on the reagent preparation water pipe (303);
one maintenance pipe (400) is arranged in the water sample collection pipe (300) and is provided with an annular gap with the water sample collection pipe (300), one end of the maintenance pipe (400) is positioned at the external light type metal filtering film pipe (200) and the internal and external light type metal filtering film pipe (200), and the other end of the maintenance pipe is connected with a back washing mechanism (500) for maintaining the external light type metal filtering film pipe (200).
4. A water sample pretreatment system as claimed in claim 3, wherein: the liquid distribution bin (101) comprises:
and the dividing plate (107) is vertically arranged, the front end and the rear end of the dividing plate are fixed with the treatment bin (100), a liquid passing gap is formed between the upper end and the lower end of the dividing plate and the bin body, the dividing plate (107) is of an obtuse angle structure, the opening end of the dividing plate faces the liquid inlet, and the liquid inlet corresponds to the middle part of the dividing plate (107).
5. A water sample pretreatment system as claimed in claim 3, wherein: the water sample filtering device further comprises:
the filtering bin (600) is sleeved outside the external light type metal filtering membrane pipe (200) in a closed manner, filtering holes for primarily filtering suspended particles are formed in the filtering bin, and a one-way water-stop plate (603) which can be opened when the backwashing mechanism (500) works is arranged at the bottom of the filtering bin (600).
6. The water sample pretreatment system of claim 5, wherein: the filter bin (600) comprises an outer bin body (601) and an inner bin body (602), wherein the outer bin body (601) and the inner bin body (602) are sleeved with each other and fixed with the maintenance pipe (400), a space is formed between the outer bin body (601) and the inner bin body (602), and upper end faces of the outer bin body (601) and the inner bin body (602) are provided with filter holes which are staggered up and down.
7. The water sample pretreatment system of claim 6, wherein: the upper end surfaces of the outer bin body (601) and the inner bin body (602) are both slope surfaces which incline downwards.
8. A water sample pretreatment system as claimed in claim 3, wherein: the backwash mechanism (500) includes:
the air outlet end of the air storage part (501) is hermetically connected with the maintenance pipe (400);
an air pump (502) for inflating the air storage part (501);
a first pressure sensor for detecting the internal pressure of the gas storage part (501);
a first control valve (503) for controlling the gas storage part (501) to release the gas with positive pressure;
and a first controller, wherein the signal input end of the first controller is connected with the first pressure sensor, and the control output end of the first controller is connected with the first control valve (503) and the air pump (502).
9. A water sample pretreatment system as claimed in claim 3, wherein: the backwash mechanism (500) includes:
a liquid storage tank (504), the water inlet end of which is connected with a water source through a pipe body, and a water pump (505) is arranged on the pipe body;
an air bag (506) which is in an expanded state after air storage and is arranged in the liquid storage tank (504) and has a liquid storage space with the liquid storage tank (504);
a second pressure sensor for detecting an internal pressure of the reservoir (504);
a second control valve (507) for controlling the liquid outlet end of the liquid storage tank (504) to release the liquid with positive pressure;
and the signal input end of the second controller is connected with the second pressure sensor, and the control output end of the second controller is connected with the second control valve (507) and the water pump (505).
10. A water sample pretreatment system as claimed in claim 3, wherein: the bottom wall of the suspension bin (104) is of a downward cone structure, and the emptying pipe (106) is arranged at the lowest part of the bottom wall.
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| CN202010212462.5A CN111289339A (en) | 2020-03-24 | 2020-03-24 | Water sample pretreatment method and pretreatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114088505A (en) * | 2021-11-18 | 2022-02-25 | 光大水务科技发展（南京）有限公司 | Pretreatment device system of water treatment water quality detection instrument and working method thereof |
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