CN112452028A - Method capable of simultaneously solving problems of filter cloth blockage and water loss of vertical filter cloth filter - Google Patents
Method capable of simultaneously solving problems of filter cloth blockage and water loss of vertical filter cloth filter Download PDFInfo
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- CN112452028A CN112452028A CN202011156205.0A CN202011156205A CN112452028A CN 112452028 A CN112452028 A CN 112452028A CN 202011156205 A CN202011156205 A CN 202011156205A CN 112452028 A CN112452028 A CN 112452028A
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- 239000004744 fabric Substances 0.000 title claims abstract description 218
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000011001 backwashing Methods 0.000 claims abstract description 96
- 239000010865 sewage Substances 0.000 claims abstract description 57
- 238000007790 scraping Methods 0.000 claims abstract description 26
- 239000003814 drug Substances 0.000 claims abstract description 25
- 238000005086 pumping Methods 0.000 claims abstract description 16
- 239000010802 sludge Substances 0.000 claims description 43
- 238000009434 installation Methods 0.000 claims description 26
- 230000007704 transition Effects 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 12
- 230000035699 permeability Effects 0.000 claims description 12
- 210000004877 mucosa Anatomy 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 8
- 230000000712 assembly Effects 0.000 claims description 7
- 238000000429 assembly Methods 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 238000011010 flushing procedure Methods 0.000 claims 1
- 230000008569 process Effects 0.000 description 11
- 229920002401 polyacrylamide Polymers 0.000 description 8
- 230000003750 conditioning effect Effects 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- -1 nitrogen ion Chemical class 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 6
- 238000005189 flocculation Methods 0.000 description 4
- 230000016615 flocculation Effects 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000008213 purified water Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/04—Controlling the filtration
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method capable of simultaneously solving the problems of filter cloth blockage and water loss of a vertical filter cloth filter. The method comprises the steps of separately controlling mud scraping and back washing of the filter cloth; the filter cloth mud scraping control program and the back washing control program are separately designed into two mutually independent control programs, and the two independent control programs are operated through two different modules of a PLC (programmable logic controller); controlling a travelling crane driving device to drive a travelling crane assembly to drive a mud suction main pipe and a mud suction branch pipe assembly to scrape and wash the filter cloth for one cycle every 15-20 minutes through a filter cloth mud scraping control program of a PLC (programmable logic controller); and controlling the back washing pump to start back washing and water pumping once every 3-4 hours by a back washing control program of the PLC controller. The invention solves the problem that the filter cloth filter tank in the sewage treatment industry has filter cloth blockage and filter water failure due to the addition of a medicament at the front end of the inlet water, and simultaneously solves the problem of water loss of the filter cloth filter tank under the premise of unsaturated sewage treatment amount.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and relates to a method capable of simultaneously solving the problems of filter cloth blockage and water loss of a vertical filter cloth filter.
Background
In the current sewage treatment industry, particularly in the filtration recovery treatment industry of municipal sewage, river sewage and industrial wastewater, a commonly used device is a fiber filter cloth filter (namely a vertical plate type filter cloth filter), as for the final link or the penultimate link of sewage treatment, the sewage filtered by the filter cloth filter needs to reach various indexes of the environmental protection bureau on sewage and wastewater treatment, such as various indexes of effluent SS, BOD, COD, nitrogen ion content, phosphorus ion content and the like, the filter cloth can effectively intercept SS and can also remove partial nitrogen ions and phosphorus ions, but can not reduce BOD, COD and most of nitrogen ions and phosphorus ions in water, and the indexes can reach the standard after conditioning reaction by adding conditioning agents such as PAC flocculant, PAM and the like.
Under the condition that mineral substances in sewage are more, in order to enable the sewage treated by the rear end to reach the standard, more conditioning agents such as PAC (polyaluminium chloride), PAM (polyacrylamide) and the like need to be added into a sewage pool or a flocculation pool at the front end, particularly the mineral substance content of the sewage in the north is high, and the conditioning agents are usually added ten times or hundred times. However, the added medicament amount is large, and the unreacted participating medicament and the new medicament generated after the reaction have high viscosity, so that a glue-like adhesive film can be formed on the filter cloth in a short time (about 20 minutes), gaps of the filter cloth are blocked, the water passing failure is caused, and the automatic recovery cannot be realized. These problems have become common problems in the sewage treatment industry.
The basic working principle of the vertical-piece type cloth filter is as follows: adding agents such as PAC (polyaluminium chloride), PAM (polyacrylamide) and the like into the front-end flocculation tank for conditioning, then feeding the sewage which is subjected to sedimentation in the secondary sedimentation tank into the vertical piece type filter cloth filtering tank from the water inlet end of the tank body through a sludge inlet pump, filtering the sewage by using filter cloth, intercepting dirt by using the filter cloth, and allowing the filtered clean water to flow out through a water passing bottom plate and a water outlet weir to finish the filtering action; when the accumulated amount of dirt on the filter cloth is increased to a certain degree, the permeability of the filter cloth is deteriorated, the water level is increased, and a filter cloth mud scraping and back washing program is started (a driving device and a back washing pump are started at intervals of a certain time through the time set by a PLC): the driving device drives the driving assembly to drive the mud suction main pipe and the mud suction branch pipe to scrape and wash the filter cloth for one cycle, and meanwhile, the backwashing pump sucks dirt on the surface of the filter cloth together with sewage and then discharges the sewage out of the tank body through the sludge pipe and the sludge tank to finish the action of backwashing the filter cloth.
The conventional method for simultaneously solving the problems of filter cloth blockage and water loss of a vertical filter cloth filter usually comprises the following steps: by adopting a linkage mode, the travelling crane driving device is controlled to drive the travelling crane assembly, the mud suction main pipe and the mud suction branch pipe assembly to scrape and wash the filter cloth for one cycle (one time of travelling the travelling crane back and forth is a cycle, the filter cloth is scraped and washed once, and medicament mucosa and dirt on the surface of the filter cloth are scraped) by setting each interval to be 2 hours through a control program of the PLC controller, and meanwhile, the sewage pump is controlled to backwash and pump water once. That is, the existing method is that the travelling crane assembly, the mud suction main pipe and the mud suction branch pipe scrape and wash the filter cloth for one cycle every 2 hours, and the sewage pump backwashes and pumps water once every 2 hours. This method has a great problem in its operation: the travelling crane walks for one circulation scraping and washing once every 2 hours, thick viscous dirt is adhered on the filter cloth and is difficult to scrape and wash, so that the service life of the filter cloth is greatly shortened, the filter cloth needs to be frequently replaced, and the operation cost and the use cost are improved; the sewage pump (i.e. the back flush pump) performs back flush and water pumping once every 2 hours, and under the condition that the sewage treatment amount of the cloth filter is unsaturated, the water loss in the filter cloth filter is serious, the normal operation of the cloth filter can be influenced, and the treatment effect of the cloth filter is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a treatment process capable of solving the problems of filter cloth blockage and filtration water failure caused by adding a medicament at the front end of water inlet of a filter cloth filter in the sewage treatment industry and the water loss problem in the filter cloth filter under the condition of unsaturated sewage treatment amount, namely a method capable of simultaneously solving the problems of filter cloth blockage and water loss of a vertical filter cloth filter.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a method for simultaneously solving the problems of filter cloth blockage and water loss of a vertical filter cloth filter, which comprises the following steps: a method of separately controlling the mud scraping control and the back washing control of the filter cloth is adopted; the filter cloth mud scraping control program and the back washing control program are separately designed into two mutually independent control programs, and the two independent control programs are operated through two different modules of a PLC (programmable logic controller);
through a filter cloth mud scraping control program of the PLC, a travelling crane driving device is controlled to drive a travelling crane assembly to drive a mud suction main pipe and a mud suction branch pipe assembly to scrape and wash filter cloth for one cycle every 20 minutes, medicament mucosa and dirt on the surface of the filter cloth are scraped, and the permeability of the filter cloth is ensured;
controlling a back washing pump to start once every 3.5-4.5 hours by a back washing control program of the PLC controller, namely back washing and pumping water once; after the backwashing pump is started, dirt on the surface of the filter cloth is sucked together with sewage through the sludge suction branch pipe of the sludge suction branch pipe assembly, and then enters a sludge tank through the backwashing pump transition pipe and the sludge suction main pipe in sequence and is discharged out of the tank body.
Further, a filter cloth mud scraping control program of the PLC controls a travelling crane driving device to drive a travelling crane assembly to drive a mud suction main pipe and a mud suction branch pipe assembly to scrape and wash filter cloth for one cycle every 20 minutes;
and controlling the back washing pump to start once every 4 hours by a back washing control program of the PLC controller, namely back washing and pumping once.
Furthermore, the running time of the backwashing water pumping after each starting of the backwashing pump is 5-10 minutes.
Furthermore, the vertical piece type cloth filter comprises a filter body, a filter unit, a track installation assembly, a travelling drive device, a backwashing pump transition pipe, a sludge suction main pipe, a sludge suction branch pipe assembly and a water passing bottom plate installation assembly; the water passing bottom plate installation assembly is arranged at the lower part in the tank body; the filtering unit is vertically arranged on the water passing bottom plate installation assembly; the filter units are arranged in a plurality of rows and a plurality of columns; each filter unit is formed by inserting two plug-in board type square vertical piece fiber filter cloth on the front side and the back side into a square filter frame assembly; the front side and the back side of the filter cloth are provided with two inserting plate type square vertical sheet fiber filter cloth and a square filter frame which enclose into an internal hollow structure; the bottom of the filter frame is provided with a water outlet hole; a water outlet hole is also formed in the water passing bottom plate mounting assembly; the mud suction main pipe is supported and fixed through the main pipe; the travelling crane assembly is fixedly connected with the mud suction main pipe; the travelling crane driving device is connected with the travelling crane assembly, can drive the travelling crane assembly to travel back and forth along the track installation assembly, and drives the mud suction main pipe and the mud suction branch pipe assembly to move back and forth; the mud suction branch pipe is provided with mud suction holes which are close to the filter cloth, the mud suction branch pipe extends into the space between the filter frames of the filter unit and is tightly attached to the outside of the filter cloth, and the mud suction branch pipe can move back and forth to scrape and wash the filter cloth and scrape off medicament mucosa and dirt on the surface of the filter cloth; the back washing pump is fixed on the travelling crane assembly and can travel along with the travelling crane assembly; the inlet of the back washing pump is connected with the mud suction branch pipe, and a back washing pump transition pipe connected with the outlet of the back washing pump is communicated with the mud suction main pipe through a flexible joint; one output end of the PLC is connected with the driving device; the other output end of the PLC is connected with a motor contactor of the backwashing pump; the PLC controller can control the driving device to be started once every a certain time interval, control the driving assembly, the mud suction main pipe and the mud suction branch pipe to scrape and wash filter cloth back and forth for one cycle, and simultaneously control the back washing pump to be started every a certain time interval to carry out back washing and water pumping once.
Furthermore, the vertical piece type cloth filter also comprises a filter frame straightening assembly and a screw rod; the filter frame straightening assemblies are arranged on the tops of the square filter frame assemblies of the same row of filter units, so that the filter frame assemblies of the same row are positioned on the same straight line; the screw rods are arranged on two sides of the filter frame and used for adjusting the vertical verticality of the filter frame.
Furthermore, the vertical piece type cloth filter also comprises a slide wire installation assembly; and a cable drag chain is arranged on the slide wire installation assembly.
Furthermore, a water level sensor and a liquid level meter are arranged on the tank body; the water level sensor is connected with the input end of the PLC; limiting mounting seats are arranged on two sides of the pool body, and the back-and-forth walking position of the travelling crane assembly can be limited.
Furthermore, a water inlet weir and a water inlet weir cover plate are arranged at the water inlet end of the pool body; an effluent weir installation assembly is arranged at the effluent end of the pool body; the upper part of the tank body is provided with a sludge tank connected with a sludge suction main pipe; the periphery of the pool body is supported and fixed through pool body supporting channel steel.
Further, the treatment process of the filter cloth of the vertical filter cloth filter is as follows:
the sewage with the front end added with the chemicals enters a vertical piece type filter cloth filter tank and is filtered by a filter frame and a filter cloth unit to be treated;
when the accumulated dirt on the filter cloth is increased to a certain degree, the permeability of the filter cloth is deteriorated, the water level is increased, and a filter cloth mud scraping program and a backwashing program are started (a driving device is started every 20 minutes and a backwashing pump is started every 4 hours by adopting a separate control mode and setting time through a PLC controller):
through a filter cloth mud scraping control program, a travelling crane driving device is controlled to drive a travelling crane assembly to drive a mud suction main pipe and a mud suction branch pipe to scrape and wash filter cloth for one cycle every 20 minutes, medicament mucosa and dirt on the surface of the filter cloth are scraped, and the permeability of the filter cloth is ensured;
controlling a back washing pump to back wash and pump water once every 4 hours through a back washing control program, wherein the running time of the back washing and pumping water is 5-10 minutes; after the backwashing pump is started, dirt on the surface of the filter cloth is sucked together with sewage through the sludge suction branch pipe, and then the dirt enters the sludge tank through the backwashing pump transition pipe and the sludge suction main pipe in sequence and is discharged out of the tank body, so that the action of backwashing the filter cloth is completed.
Further, when the water level in the filter cloth filter tank rises to a set certain height, the water level sensor gives a signal to the PLC controller, and the PLC controller controls the driving device and the backwashing pump to start.
The invention has the beneficial effects that:
the treatment process can simultaneously solve the problems of filter cloth blockage and water loss of the vertical filter cloth filter, and is suitable for treatment industries and projects of relevant sewage and wastewater treatment including municipal sewage, river sewage, lake sewage, industrial wastewater and the like; the technical problems that the filter cloth is blocked by a vertical-blade type filter cloth filter tank medicament and the filter tank cannot normally filter sewage commonly existing in the current sewage treatment industry can be solved, so that the vertical-blade type filter cloth filter tank is applicable to a wider sewage treatment field, the risk of blocking the filter cloth by the medicament can be greatly reduced, and the filter tank can be ensured to stably and normally operate under the conditions of various medicament adding types and medicament adding amounts; and moreover, the problem of water loss in the filter cloth filter tank under the condition of unsaturated sewage treatment amount can be solved, and the normal operation and treatment effect of the vertical piece type filter cloth filter tank can be ensured.
Compared with the prior art, the treatment process and the control method which can simultaneously solve the problems of filter cloth blockage and water loss of the vertical filter cloth filter chamber have the following advantages:
1. the treatment process and the control method solve the problem that the filter cloth blocks filtered water and loses efficacy due to the fact that a medicament is added at the front end of inlet water of the filter cloth filter in the sewage treatment industry.
2. The treatment process and the control method solve the problem of water loss of the cloth filter on the premise of unsaturated sewage treatment amount.
3. The treatment process and the control method of the invention do not damage the filter cloth on the premise of solving the blockage of the filter cloth.
Drawings
FIG. 1 is a schematic front view of a vertical blade cloth filter according to the present invention;
FIG. 2 is a schematic side view of a vertical blade cloth filter according to the present invention.
In the figure: 1. data plate 2, water inlet weir cover plate 3, water inlet weir 4, driving assembly 5, rain-proof shed 6, track mounting assembly 7, slide wire mounting assembly 8, filter frame straightening assembly 9, tank body supporting channel steel 10, water level sensor 11, limiting mounting seat 12, liquid level meter 13, main pipe support 14, flexible joint 15, backwash pump transition pipe 16, backwash pump 17, mud suction main pipe 18, sludge tank 19, sludge tank support 20, mud suction branch pipe assembly 21, water outlet weir mounting assembly 22, bottom plate mounting assembly 23, filter frame assembly 24, screw 25, tank body 26, electric control cabinet 27, cable and accessories thereof
Detailed Description
The invention is further described below with reference to the following figures and examples.
Examples
As shown in fig. 1 and 2, the vertical-plate filter cloth filter according to the present invention includes a tank body 25, a filtering unit, a traveling vehicle assembly 4, a traveling vehicle driving device, a rail mounting assembly 6, a water passing bottom plate mounting assembly 22, a filter frame assembly 23, a filter frame alignment assembly 8, a screw 24, a mud suction branch pipe assembly 20, a backwash pump 16, a backwash pump transition pipe 15, and a mud suction main pipe 17; the periphery of the pool body 25 is supported by pool body supporting channel steel 9; the water passing bottom plate installation assembly 22 is installed at the lower part in the tank body 25; the filtering unit is vertically arranged on the water passing bottom plate installation assembly 22; the filter units are arranged in a plurality of rows and a plurality of columns; each filter unit is formed by inserting two plug-in board type square vertical piece fiber filter cloth on the front side and the back side into a square filter frame assembly 23; two inserting plate type square vertical piece fiber filter cloth on the front side and the back side and a square filter frame are enclosed to form an internal hollow structure. The filter frame straightening assembly 8 is arranged on the top of the square filter frame assembly 23 of the same row of filter units, so that the filter frame assemblies 23 of the same row are positioned on the same straight line; the screw rods 24 are arranged on two sides of the filter frame and used for adjusting the vertical verticality of the filter frame; the bottom of the filter frame is provided with a water outlet hole; the water passing bottom plate mounting assembly 22 is also provided with a water outlet hole; the mud suction main pipe 17 is fixed through the main pipe support 13; the travelling crane assembly 4 is fixedly connected with the mud suction main pipe 17; the travelling crane driving device is connected with the travelling crane assembly 4, can drive the travelling crane assembly 4 to travel back and forth along the track installation assembly 6, and drives the mud suction main pipe 17 and the mud suction branch pipe assembly 20 to move back and forth; the mud suction branch pipe of the mud suction branch pipe assembly 20 is provided with mud suction holes which are close to the filter cloth, the mud suction branch pipe extends into the space between the filter frames of the filter unit and is tightly attached to the outer surface of the filter cloth, and the mud suction branch pipe can move back and forth to scrape and wash the filter cloth and scrape off medicament mucosa and dirt on the surface of the filter cloth; the back washing pump 16 is fixed on the travelling crane assembly 4 and can travel along with the travelling crane assembly 4; an inlet of the backwash pump 16 is connected with a sludge suction branch pipe of the sludge suction branch pipe assembly 20, and a backwash pump transition pipe 15 connected with an outlet of the backwash pump 16 is communicated with a sludge suction main pipe 17 through a flexible joint 14 (a rubber soft joint); one output end of the PLC is connected with the driving device; the other output end of the PLC is connected with a motor contactor of the backwashing pump; the PLC controller can control the driving device to be started once every a certain time interval, control the driving assembly, the mud suction main pipe and the mud suction branch pipe to scrape and wash filter cloth back and forth for one cycle, and simultaneously control the back washing pump to be started every a certain time interval to carry out back washing and water pumping once.
A water level sensor 10 and a liquid level meter 12 are arranged on the tank body 25; limiting installation seats 11 are arranged on two sides of the tank body 25 and can limit the back-and-forth walking position of the travelling crane assembly 4.
A water inlet weir 3 and a water inlet weir cover plate 2 are arranged at the water inlet end of the tank body 25; an effluent weir installation assembly 21 is arranged at the effluent end of the pool body 25; the upper part of the tank body 25 is provided with a sludge tank 18 connected with a sludge suction main pipe 17. The sludge tank 18 is fixed by a sludge tank support 19.
An electric control cabinet 26 is arranged on one side of the tank body 25; the cable and the cable drag chain of the accessory 27 thereof which are connected from the electric control cabinet 26 are arranged on the slide wire installation assembly 7 above the pool body 25 and can walk along with the travelling crane assembly 4.
A nameplate 1 is also arranged on one side of the water inlet end of the tank body 25. The driving assembly is provided with a rainproof shed 5.
The invention relates to a method for simultaneously solving the problems of filter cloth blockage and water loss of a vertical filter cloth filter, which comprises the following steps: a method of separately controlling the mud scraping control and the back washing control of the filter cloth is adopted; the filter cloth mud scraping control program and the back washing control program are separately designed into two mutually independent control programs, and the two independent control programs are operated through two different modules of a PLC (programmable logic controller);
through a filter cloth mud scraping control program of a PLC (programmable logic controller), a travelling crane driving device is controlled to drive a travelling crane assembly 4 to drive a mud suction main pipe 17 and a mud suction branch pipe assembly 20 to scrape and wash filter cloth for one cycle every 20 minutes, medicament mucosa and dirt on the surface of the filter cloth are scraped, and the permeability of the filter cloth is ensured;
controlling the back washing pump 16 to start once every 4 hours by a back washing control program of the PLC controller, namely back washing and pumping once; the running time of the backwashing water pumping after each starting of the backwashing pump 16 is 5-10 minutes. After the backwash pump 16 is started, dirt on the surface of the filter cloth and sewage are sucked through the sludge suction branch pipes of the sludge suction branch pipe assembly 20, and then the dirt and the sewage sequentially pass through the backwash pump transition pipe 15 and the sludge suction main pipe 17 to enter the sludge tank 18 and then are discharged out of the tank body.
The working principle of the vertical sheet type cloth filter chamber is as follows:
adding agents such as PAC (polyaluminium chloride), PAM (polyacrylamide) and the like into the front-end flocculation tank for conditioning, then feeding the sewage into a secondary sedimentation tank for sedimentation, feeding the sewage into a vertical piece type filter cloth filter tank from the water inlet end of a tank body 25 through a sludge inlet pump through a water inlet weir 3, filtering the sewage through a filter frame assembly 23, intercepting dirt by filter cloth, and allowing the filtered purified water to flow out through a water passing bottom plate installation assembly 22 and a water outlet weir installation assembly 21 to finish the filtering action;
when the accumulated dirt on the filter cloth is increased to a certain degree, the permeability of the filter cloth is deteriorated, the water level is increased, and a filter cloth mud scraping program and a backwashing program are started (a driving device is started every 20 minutes and a backwashing pump 16 is started every 4 hours by adopting a separate control mode and setting time through a PLC (programmable logic controller)): the travelling crane driving device is started to drive the travelling crane assembly 4 to travel, and the travelling crane assembly 4 travels to drive the mud suction main pipe 17 and the mud suction branch pipe 20 assembly to scrape and wash filter cloth for one cycle; the backwashing pump 16 is started, the backwashing pump 16 sucks dirt on the surface of the filter cloth together with sewage through the mud suction branch pipe of the mud suction branch pipe assembly 20, and then the dirt enters the sludge tank 18 through the backwashing pump transition pipe 15 and the mud suction main pipe 17 in sequence and is discharged out of the tank body, so that the action of backwashing the filter cloth is completed;
when the water level in the filter cloth filter tank rises to a set certain height, the water level sensor 10 gives a signal to the PLC controller, and the PLC controller controls the driving device and the back washing pump 16 to start, at the moment, even if the set starting time does not exist, the driving device and the back washing pump 16 can also start to prevent the overflow of the water level in the tank due to overhigh water level.
The invention relates to a vertical piece type cloth filter and a front-end and rear-end integral treatment process route:
after agents such as PAC, PAM and the like are added into the front end flocculation tank for conditioning, sewage (SS is less than 30mg/L) after sedimentation in the secondary sedimentation tank enters the vertical piece type filter cloth filter tank from the water inlet end of the tank body through the sludge inlet pump, after being filtered by the filter frame assembly 23, dirt is intercepted by the filter cloth, and filtered purified water (SS is less than 10mg/L) flows out to the disinfection tank at the rear end through the water passing bottom plate installation assembly 22 and the water outlet weir installation assembly 21, and the drained water is recycled after reaching the standard.
The method for simultaneously solving the problems of filter cloth blockage and water loss of the vertical filter cloth filter comprises the following steps:
the sewage with the front end added with the chemicals enters a vertical piece type filter cloth filter tank and is filtered by a filter frame and a filter cloth unit to be treated;
when the accumulated dirt on the filter cloth is increased to a certain degree, the permeability of the filter cloth is deteriorated, the water level is increased, and a filter cloth mud scraping program and a backwashing program are started (a driving device is started every 20 minutes and a backwashing pump 16 is started every 4 hours by adopting a separate control mode and setting time through a PLC (programmable logic controller)):
filter cloth mud scraping control program: the electric control program (which is a control program of a PLC controller and controls a driving device to drive a motor) drives the driving assembly 4 to drive the mud suction main pipe 17 and the mud suction branch pipe assembly 20 to scrape and wash the filter cloth for one cycle every 20 minutes, so that the medicament mucosa and dirt on the surface of the filter cloth are scraped, and the permeability of the filter cloth is ensured;
a back washing control program: the backwashing pump 16 is controlled by an electric control program to perform backwashing water pumping once every 4 hours, and the running time of the backwashing water pumping is 5-10 minutes (the time can be adjusted according to the specific conditions of the project); after the backwashing pump 16 is started, dirt on the surface of the filter cloth is sucked together with sewage through the sludge suction branch pipe of the sludge suction branch pipe assembly 20, and then the dirt enters the sludge tank 18 through the backwashing pump transition pipe 15 and the sludge suction main pipe 17 in sequence and is discharged out of the tank body, so that the action of backwashing the filter cloth is completed;
when the water level in the filter cloth filter tank rises to a set certain height, the water level sensor 10 gives a signal to the PLC controller, and the PLC controller controls the driving device and the back washing pump 16 to start, at the moment, even if the set starting time does not exist, the driving device and the back washing pump 16 can also start to prevent the overflow of the water level in the tank due to overhigh water level.
In the invention, the back washing control program is an independent control program, and the filter cloth mud scraping control program is also an independent control program; the back washing control program and the filter cloth mud scraping control program are independent and have no interference, and the execution actions of the back washing control program and the filter cloth mud scraping control program can be separated and overlapped. Therefore, the problem that the filter cloth is blocked by the medicament is solved, the backwashing frequency and time are reduced, the loss of sewage treatment capacity is reduced, and the method is suitable for filter cloth filter tank sewage treatment projects and industries with unsaturated sewage treatment capacity and various medicament additions.
Compared with the prior art, the invention has the following improvement points and advantages:
1. compared with the traditional cloth filter treatment process, the frequency of scraping and washing the filter cloth by the travelling crane assembly, the mud suction main pipe and the mud suction branch pipe is increased (originally, the travelling crane travels one circulation scraping and washing one filter cloth every 2 hours, and the travelling crane travels one circulation scraping and washing one filter cloth every 20 minutes), so that the filter cloth can not be blocked by medicament mucosa and dirt, and the permeability of the filter cloth is improved;
2. compared with the traditional cloth filter treatment process, the starting frequency of the backwashing pump is reduced (the sewage pump, namely the backwashing pump, pumps water once every 2 hours, and the backwashing pump pumps water once every 4 hours), the treatment water loss caused by backwashing is reduced, the electric energy consumption is saved, and the service lives of the backwashing pump and the filter cloth are prolonged;
3. compared with the traditional cloth filter treatment process, the filter cloth mud scraping control program and the backwashing control program are separately designed into two mutually independent control programs (separate control and separate operation are realized through two different modules of a PLC), no interference influence exists between the two programs, the automatic control program is simple and convenient, and the inspection and the maintenance are easy.
The processing technology of the vertical piece type cloth filter tank solves the technical problems that the filter tank cannot normally filter sewage because the vertical piece type cloth filter tank blocks the filter cloth by the medicament commonly existing in the current sewage treatment industry, so that the vertical piece type cloth filter tank is applicable to a wider sewage treatment field, the risk of blocking the filter cloth by the medicament is greatly reduced, and the stable and normal operation of the filter tank under the conditions of various types and dosage is ensured; and moreover, the problem of water loss in the filter cloth filter tank under the condition of unsaturated sewage treatment amount is solved, and the normal operation and treatment effect of the vertical piece type filter cloth filter tank are ensured.
Claims (10)
1. A method for simultaneously solving the problems of filter cloth blockage and water loss of a vertical filter cloth filter is characterized by comprising the following steps: a method of separately controlling the mud scraping control and the back washing control of the filter cloth is adopted; the filter cloth mud scraping control program and the back washing control program are separately designed into two mutually independent control programs, and the two independent control programs are operated through two different modules of a PLC (programmable logic controller);
through a filter cloth mud scraping control program of the PLC, a travelling crane driving device is controlled to drive a travelling crane assembly to drive a mud suction main pipe and a mud suction branch pipe assembly to scrape and wash filter cloth for one cycle every 15-25 minutes, medicament mucosa and dirt on the surface of the filter cloth are scraped, and the permeability of the filter cloth is ensured;
and controlling a back flush pump to start once every 3.5-4.5 hours by a back flush control program of the PLC controller, namely back flushing to pump water once, sucking dirt on the surface of the filter cloth together with sewage by a mud suction branch pipe of a mud suction branch pipe assembly, then sequentially passing through a back flush pump transition pipe and a mud suction main pipe, entering a sludge tank and then discharging the sludge out of the tank body.
2. The method for simultaneously solving the problems of filter cloth blockage and water loss of the vertical blade filter cloth filter tank as claimed in claim 1, wherein a traveling crane driving device is controlled to drive a traveling crane assembly to drive a mud suction main pipe and a mud suction branch pipe assembly to scrape and wash the filter cloth for one cycle every 20 minutes through a filter cloth scraping control program of a PLC (programmable logic controller);
and controlling the back washing pump to start once every 4 hours by a back washing control program of the PLC controller, namely back washing and pumping once.
3. The method for simultaneously solving the problems of the filter cloth blockage and the water loss of the vertical filter cloth filter according to claim 1 or 2, wherein the backwashing water pumping operation time after each start of the backwashing pump is 5 to 10 minutes.
4. The method for simultaneously solving the problems of filter cloth blockage and water loss of the vertical filter cloth filter tank as claimed in claim 1 or 2, wherein the vertical filter cloth filter tank comprises a tank body, a filtering unit, a rail installation assembly, a travelling crane driving device, a backwashing pump transition pipe, a sludge suction main pipe, a sludge suction branch pipe assembly and a water passing bottom plate installation assembly; the water passing bottom plate installation assembly is arranged at the lower part in the tank body; the filtering unit is vertically arranged on the water passing bottom plate installation assembly; the filter units are arranged in a plurality of rows and a plurality of columns; each filter unit is formed by inserting two plug-in board type square vertical piece fiber filter cloth on the front side and the back side into a square filter frame assembly; the front side and the back side of the filter cloth are provided with two inserting plate type square vertical sheet fiber filter cloth and a square filter frame which enclose into an internal hollow structure; the bottom of the filter frame is provided with a water outlet hole; a water outlet hole is also formed in the water passing bottom plate mounting assembly; the mud suction main pipe is supported and fixed through the main pipe; the travelling crane assembly is fixedly connected with the mud suction main pipe; the travelling crane driving device is connected with the travelling crane assembly, can drive the travelling crane assembly to travel back and forth along the track installation assembly, and drives the mud suction main pipe and the mud suction branch pipe assembly to move back and forth; the mud suction branch pipe is provided with mud suction holes which are close to the filter cloth, the mud suction branch pipe extends into the space between the filter frames of the filter unit and is tightly attached to the outside of the filter cloth, and the mud suction branch pipe can move back and forth to scrape and wash the filter cloth and scrape off medicament mucosa and dirt on the surface of the filter cloth; the back washing pump is fixed on the travelling crane assembly and can travel along with the travelling crane assembly; the inlet of the back washing pump is connected with the mud suction branch pipe, and a back washing pump transition pipe connected with the outlet of the back washing pump is communicated with the mud suction main pipe through a flexible joint; one output end of the PLC is connected with the driving device; the other output end of the PLC is connected with a motor contactor of the backwashing pump; the PLC controller can control the driving device to be started once every a certain time interval, control the driving assembly, the mud suction main pipe and the mud suction branch pipe to scrape and wash filter cloth back and forth for one cycle, and simultaneously control the back washing pump to be started every a certain time interval to carry out back washing and water pumping once.
5. The method for simultaneously solving the problems of filter cloth blockage and water loss of the vertical blade filter cloth filter according to claim 4, wherein the vertical blade filter cloth filter further comprises a filter frame alignment assembly and a screw rod; the filter frame straightening assemblies are arranged on the tops of the square filter frame assemblies of the same row of filter units, so that the filter frame assemblies of the same row are positioned on the same straight line; the screw rods are arranged on two sides of the filter frame and used for adjusting the vertical verticality of the filter frame.
6. The method for simultaneously solving the problems of the filter cloth blockage and the water loss of the vertical blade filter cloth filter according to claim 5, wherein the vertical blade filter cloth filter further comprises a slide wire installation assembly; and a cable drag chain is arranged on the slide wire installation assembly.
7. The method for simultaneously solving the problems of the filter cloth blockage and the water loss of the vertical filter cloth filter tank as claimed in claim 6, wherein a water level sensor and a liquid level meter are arranged on the tank body; the water level sensor is connected with the input end of the PLC; limiting mounting seats are arranged on two sides of the pool body, and the back-and-forth walking position of the travelling crane assembly can be limited.
8. The method for simultaneously solving the problems of filter cloth blockage and water loss of the vertical filter cloth filter according to claim 7, wherein a water inlet weir and a water inlet weir cover plate are arranged at the water inlet end of the tank body; an effluent weir installation assembly is arranged at the effluent end of the pool body; the upper part of the tank body is provided with a sludge tank connected with a sludge suction main pipe; the periphery of the pool body is supported and fixed through pool body supporting channel steel.
9. The method according to claim 8, wherein the filter cloth of the vertical filter cloth filter is treated by the following steps:
the sewage with the front end added with the chemicals enters a vertical piece type filter cloth filter tank and is filtered by a filter frame and a filter cloth unit to be treated;
when the accumulated dirt on the filter cloth rises to a certain degree, the permeability of the filter cloth is deteriorated, the water level rises, a filter cloth mud scraping program and a backwashing program are started, a separated control mode is adopted, the time is set through a PLC (programmable logic controller), a driving device is started every 20 minutes, and a backwashing pump is started every 4 hours:
through a filter cloth mud scraping control program, a travelling crane driving device is controlled to drive a travelling crane assembly to drive a mud suction main pipe and a mud suction branch pipe to scrape and wash filter cloth for one cycle every 20 minutes, medicament mucosa and dirt on the surface of the filter cloth are scraped, and the permeability of the filter cloth is ensured;
controlling a back washing pump to back wash and pump water once every 4 hours through a back washing control program, wherein the running time of the back washing and pumping water is 5-10 minutes; after the backwashing pump is started, dirt on the surface of the filter cloth is sucked together with sewage through the sludge suction branch pipe, and then the dirt enters the sludge tank through the backwashing pump transition pipe and the sludge suction main pipe in sequence and is discharged out of the tank body, so that the action of backwashing the filter cloth is completed.
10. The method according to claim 9, wherein when the water level in the cloth filter tank rises to a predetermined height, the water level sensor sends a signal to the PLC controller, and the PLC controller controls the driving unit and the backwash pump to be activated, and the driving unit and the backwash pump are activated even if the predetermined activation time is not reached.
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| CN202011156205.0A CN112452028A (en) | 2020-10-26 | 2020-10-26 | Method capable of simultaneously solving problems of filter cloth blockage and water loss of vertical filter cloth filter |
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| CN113559589A (en) * | 2021-08-03 | 2021-10-29 | 上海同臣环保有限公司 | Method for optimizing filter cloth use of filter tank by adding water inlet valve positioner |
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Application publication date: 20210309 |