CN112237776A - Improved direct filtration system and method - Google Patents
Improved direct filtration system and method Download PDFInfo
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- CN112237776A CN112237776A CN201911408110.0A CN201911408110A CN112237776A CN 112237776 A CN112237776 A CN 112237776A CN 201911408110 A CN201911408110 A CN 201911408110A CN 112237776 A CN112237776 A CN 112237776A
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- 238000001914 filtration Methods 0.000 title claims abstract description 169
- 238000000034 method Methods 0.000 title claims description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 310
- 239000003814 drug Substances 0.000 claims abstract description 77
- 238000004140 cleaning Methods 0.000 claims description 152
- 238000005273 aeration Methods 0.000 claims description 90
- 238000004519 manufacturing process Methods 0.000 claims description 70
- 238000012544 monitoring process Methods 0.000 claims description 65
- 239000007788 liquid Substances 0.000 claims description 57
- 238000011001 backwashing Methods 0.000 claims description 53
- 238000005406 washing Methods 0.000 claims description 43
- 238000009295 crossflow filtration Methods 0.000 claims description 36
- 238000002791 soaking Methods 0.000 claims description 33
- 229940079593 drug Drugs 0.000 claims description 29
- 238000003860 storage Methods 0.000 claims description 21
- 239000010865 sewage Substances 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 14
- 238000005422 blasting Methods 0.000 claims description 7
- 238000005276 aerator Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 238000004590 computer program Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 230000015654 memory Effects 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003936 working memory Effects 0.000 description 1
Images
Classifications
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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
- B01D29/62—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
- B01D29/60—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
- B01D29/603—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 by flow measuring
-
- 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
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/143—Filter condition indicators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/08—Regeneration of the filter
- B01D2201/085—Regeneration of the filter using another chemical than the liquid to be filtered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/08—Regeneration of the filter
- B01D2201/087—Regeneration of the filter using gas bubbles, e.g. air
Abstract
The invention relates to an improved direct filtration system, which comprises a water production program, an aeration program, a backwashing program, a first medicine cleaning program and related components; the improved direct filtration system provided by the invention basically does not need human intervention, and the system can be automatically cleaned at regular time, so that transmembrane pressure difference is ensured to be stabilized within a set threshold value. The invention also discloses an improved direct filtration method.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a direct filtration system for pretreating raw water.
Background
In the process of filtering raw water into usable water meeting the sanitary standard, the raw water can be pretreated in various ways to reduce harmful substances in the raw water, so that the filtered raw water meets or approaches the requirement of the sanitary standard.
In the traditional filtering method, the filtering effect cannot be ensured due to the limitation of the performance of the filtering component and the structure of the filtering unit, and meanwhile, the performance of the filtering component needs to be monitored, and the filtering component needs to be manually cleaned after being blocked and cannot meet the water production requirement, so that the system cannot run smoothly, the water production is uncontrollable and unpredictable, and the system cannot be ensured to run reliably due to excessive human factors in maintenance, and the cost is high.
Disclosure of Invention
It is an object of the present invention to at least solve the above problems in the prior art and to provide an improved direct filtration system.
In some embodiments of the present application, an improved direct filtration system is provided, which comprises a cross-flow filtration unit for filtering raw water entering the cross-flow filtration unit through a water inlet pipeline and sending out through a water production pipeline through a filtration assembly in a cross-flow manner, the cross-flow filtration unit further comprising an aeration part for performing aeration cleaning on the filtration assembly; a flow monitoring unit operably coupled to the cross-flow portion of the cross-flow filtration unit or a cross-flow conduit operably connected to the cross-flow portion to monitor whether liquid is flowing out of the cross-flow portion; the pressure monitoring unit is used for monitoring the pressure difference of the inlet and the outlet of the filtering component; the backwashing unit is operably connected with the water production pipeline and is used for backwashing and cleaning the cross-flow filtering unit; the medicine cleaning unit is operatively connected with the water inlet pipeline and is used for providing cleaning liquid to the cross-flow filtering unit through the water inlet pipeline so as to soak and clean the filtering component of the cross-flow filtering unit; a control unit operably connected with the flow monitoring unit, the differential pressure monitoring unit, the backwash unit, and the drug cleaning unit, the control unit configured to:
stopping the water production program after executing the water production program for a first time period, and starting the aeration program to carry out aeration cleaning on the filter assembly for a second time period, wherein the first time period is far greater than the second time period;
circulating the water production program and the aeration program until the pressure difference provided by the pressure monitoring unit is judged to exceed the upper limit of the first threshold range, stopping the water production program and the aeration program, and starting the backwashing program to perform reverse air blasting on the filter assembly for a third time period through a self water production pipeline of the backwashing unit, wherein the third time period is greater than the second time period and far less than the first time period;
repeating the water production procedure, the aeration procedure and the backwashing procedure according to the steps;
and starting a first medicament cleaning program at regular time with a first period no matter whether the pressure difference provided by the pressure monitoring unit exceeds the upper limit of the first threshold value or not, so as to start the medicament cleaning unit, enable a first cleaning solution to enter the cross-flow filtering unit from the water inlet pipeline to perform soaking cleaning on the filtering assembly for a fourth time period which is far longer than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold value range, and stopping the soaking cleaning.
In some embodiments, the cross-flow filtration unit comprises a water inlet part, a filtration assembly, a cross-flow part, a water production part and the aeration part, wherein the water inlet part is communicated with the cross-flow part, the cross-flow part is communicated with the cross-flow pipeline, and the water storage part and the water production part of the cross-flow part are respectively arranged at two sides of the filtration assembly; the cross-flow filtration unit is further configured to access raw water to the water inlet portion through the water inlet pipeline, the water inlet portion guides the raw water to the water storage space of the cross-flow portion, and at least one part of the raw water reaches the water production portion after being filtered by the filtration assembly.
In some embodiments, a water inlet pump is arranged on the water inlet pipeline and used for controlling water supply to the cross-flow filtering unit, and a cross-flow valve is operably connected to the cross-flow pipeline so as to control the on-off of the cross-flow pipeline; a water production valve is arranged on the water production pipeline and used for controlling the on-off of the water production pipeline; the cross flow part is also communicated with a sewage discharge pipeline through a sewage discharge valve and is used for removing back washing dirt and dirt generated in a medicine cleaning procedure in a back washing procedure.
In some embodiments, the cross-flow section comprises a cross-flow pipe, a water inlet pipe connected to the water inlet section, and a cross-flow pipeline, and the flow monitoring unit is operatively connected to one end of the cross-flow pipe to monitor whether water flows out of the cross-flow pipe.
In some embodiments, the aeration part comprises an aeration pipe connected with a compressed air source through an aeration pipeline, and the aeration pipe is arranged on one side (of the water storage part) of the water production pipe 151 of the filter assembly and used for guiding compressed air to the surface of the filter assembly for aeration cleaning; the aerator pipe is configured to communicate with a compressed air source to direct compressed air into the aerator pipe.
In some embodiments, the control unit is configured to set a pre-aeration program prior to the water production program such that the aeration section performs a pre-aeration cleaning of the filter assembly for a fixed fifth time period.
In some embodiments, the backwash unit further comprises the blowdown section operably connected to the water production line for backwashing and blowdown the cross-flow filtration unit;
in some embodiments, the drug cleaning unit includes a drug wash tank and a drug wash pump operably connected to the water inlet line for delivering a cleaning solution into the water storage portion for depth-of-soak cleaning of the filter assembly during a drug cleaning procedure.
In some embodiments, the medical washing tank includes a first washing liquid and a second washing liquid, and the medical washing pump is configured to direct the first washing liquid or the second washing liquid into the water inlet line to the water reservoir.
In some embodiments including the second cleaning solution, the first drug cleaning process is started at a second period timing which is far greater than the first period timing whether the pressure difference provided by the pressure monitoring unit exceeds the upper limit of the first threshold value or not, so as to start the drug cleaning unit, and the second cleaning solution enters the cross-flow filtering unit from the water inlet pipeline to perform soaking cleaning on the filtering assembly for a fourth period which is far greater than the first period timing or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold value range, and then the soaking cleaning is stopped.
In some embodiments, the pre-aeration cleaning procedure comprises: opening the cross flow valve, and sending water to be filtered into the water storage part through the water inlet pump; and when the flow monitoring unit is monitored to provide a water outflow signal, starting a compressed air source to carry out aeration cleaning on the filter assembly for a fifth time period, and then stopping aeration.
In some embodiments, the water production program comprises: the cross-flow valve is closed and the water production valve is opened to produce filtered water at the water production line for a first period of time.
In some embodiments, the aeration procedure comprises: and after the water production valve is closed, the compressed air source leads compressed air to the filtering component from the water production side through the aeration pipeline for a second time period.
In some embodiments, the backwash procedure comprises: closing the water inlet valve, the water production valve and the compressed air source, starting the backwashing unit, firstly moving the gas, backwashing and then opening the blow-down valve for blow-down, and lasting for a third time period. In some embodiments, the blowdown time is about twice the backwash time.
In some embodiments, the first pharmaceutical cleaning procedure comprises: evacuating the cross-flow filtration unit at a time point determined by the first cycle; leading clear water from the medicine washing tank into the cross-flow filtering unit through a water inlet pipeline, and stopping leading the clear water when the flow monitoring unit monitors that liquid flows out of the cross-flow pipe; then an aeration program and a backwashing program are executed; then, the prepared first cleaning liquid is pumped into the equipment, and soaked for a fourth time period which is far longer than the first time period or is stopped for soaking and cleaning for 4-8 hours when the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold range; and after the soaking time is finished, discharging all the cleaning liquid; and introducing the clean water into the cross-flow filtering unit through the water inlet pipeline again, starting an aeration program to remove residual cleaning liquid in the cross-flow filtering unit, and then emptying.
In some embodiments, the second pharmaceutical cleaning procedure comprises: evacuating the cross-flow filtration unit at a time point determined by the second period; leading clear water from the medicine washing tank into the cross-flow filtering unit through a water inlet pipeline, and stopping leading the clear water when the flow monitoring unit monitors that liquid flows out of the cross-flow pipe; then an aeration program and a backwashing program are executed; then, the prepared second cleaning liquid is pumped into the equipment, and soaked for a fourth time period which is far longer than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold range, the medicine cleaning program is stopped, for example, 4-8 hours; and after the soaking time is finished, discharging all the cleaning liquid; and introducing the clean water into the cross-flow filtering unit through the water inlet pipeline again, starting an aeration program to remove residual cleaning liquid in the cross-flow filtering unit, and then emptying.
In some embodiments, the cross-flow filtration unit uses a ceramic straight filtration membrane as the filtration component, the filtration precision is 0.1um, and the suspended matter in water defines particles with the standard of 10-0.1 um.
The direct filtration system provided by the invention is basically free from human intervention, and the system can be automatically cleaned at regular time, so that transmembrane pressure difference is ensured to be stabilized within a set threshold value. The system has the advantages that the suspended matters in the effluent can be reduced to below 1mg/L, the turbidity is close to zero, and the system has the characteristics of large effluent flux, low energy consumption, small occupied area, easy backwashing, flux recovery, short backwashing time, simple operation and the like.
The embodiment of the invention also provides an improved direct filtration method, which comprises the steps of stopping the water production program after the first time period of the water production program is executed, starting the aeration program to carry out aeration cleaning on the filter assembly for the second time period, wherein the first time period is far greater than the second time period; circulating the water production program and the aeration program until the pressure difference between the inlet and the outlet of the filter unit exceeds the upper limit of the first threshold range, stopping the water production program and the aeration program, starting the backwashing program, and performing reverse air blasting on the filter assembly for a third time period through a self water production pipeline of the backwashing unit, wherein the third time period is greater than the second time period and far less than the first time period; repeating the water production procedure, the aeration procedure and the backwashing procedure according to the steps; and starting a first medicament cleaning program at a first period timing no matter whether the pressure difference provided by the pressure monitoring unit exceeds the upper limit of the first threshold value or not, so as to start the medicament cleaning unit, enable a first cleaning solution to enter the cross-flow filtering assembly from the water inlet pipeline to perform soaking cleaning on the filtering assembly for a fourth time period which is far longer than the first time period or until the pressure difference is close to the lower limit of the first threshold value range, and stopping the soaking cleaning.
The advantages and features of the present invention will become more readily apparent to those of ordinary skill in the art from the following description taken in conjunction with the accompanying drawings, in which:
drawings
FIG. 1 is a schematic block diagram of an improved direct filtration system according to an embodiment of the present invention;
FIG. 1A is a schematic diagram of the structure of an improved cross-flow filtration unit according to an embodiment of the present invention;
FIG. 2 is a flow chart of the operation of an improved direct filtration system according to an embodiment of the present invention;
FIG. 3 is a flow diagram of a water production program for an improved direct filtration system according to an embodiment of the present invention;
FIG. 4 is a flow diagram of an aeration sequence for an improved direct filtration system according to an embodiment of the present invention;
FIG. 5 is a flow diagram of a backwash sequence of an improved direct filtration system according to an embodiment of the present invention;
FIG. 6 is a flow chart of a first medication purge routine of the improved direct filtration system in accordance with an embodiment of the present invention;
FIG. 7 is a flow diagram of a pre-aeration sequence for an improved direct filtration system according to an embodiment of the present invention; and
FIG. 8 is a flow chart of a second medication purge routine of the improved direct filtration system in accordance with an embodiment of the present invention.
Detailed Description
The improved direct filtration system and the method for implementing the same according to the present invention will be described in detail with reference to the accompanying drawings.
The embodiments described herein are only a portion of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
According to some embodiments of the present invention, an improved direct filtration system is shown in fig. 1, 1A, comprising: the cross-flow filtering unit 10 is configured to filter raw water from the raw water tank 800, which enters the cross-flow filtering unit 10 through the water inlet pipeline 20, through the filtering module 11 therein in a cross-flow manner, and send the raw water to the water production tank 900 through the water production pipeline 30; the cross-flow filtration unit 10 comprises an aeration section 12 for aeration cleaning of the filtration module 11; a flow monitoring unit 40 operatively coupled to the cross-flow portion 14 of the cross-flow filtration unit or a cross-flow exhaust line 50 connected to the cross-flow portion 14 to monitor whether liquid is flowing out of the cross-flow portion; a pressure monitoring unit 41, which monitors the pressure difference between the inlet and the outlet of the filtering assembly, for example, may be a water pressure difference sensor assembly, which is disposed at the water inlet and the water outlet of the filtering unit, and is configured to measure the pressure difference between the inlet and the outlet of the filtering assembly continuously or at a certain frequency to obtain a pressure difference; a backwash unit 60 operably connected to the water production line 30 for backwashing the cross-flow filtration unit 10; a drug cleaning unit 70 operatively connected to the water inlet line 20 for providing a cleaning solution to the cross-flow filtration unit 10 through the water inlet line 20 to perform soaking cleaning on the filtration assembly 11 of the cross-flow filtration unit 10; the sewage discharge pipeline 80 is used for cleaning and discharging the sewage generated by filtering; and a control unit 90 operatively connected to the control valves of the water inlet line 20, the water production line 30, the cross flow line 40 and the sewage drain line 50, and the flow rate monitoring unit 40, the differential pressure monitoring unit 41, the backwashing unit 60, and the drug cleaning unit 70, the control unit being configured to perform a main control procedure, the main control procedure P900 including:
stopping the water production program after executing the water production program P901 for a first time period, starting the aeration program P902 to carry out aeration cleaning on the filter assembly for a second time period, wherein the first time period is far greater than the second time period, and step S900 a;
circulating the water production program P901 and the aeration program P902 until the pressure difference provided by the pressure monitoring unit is judged to exceed the upper limit of the first threshold range, stopping the water production program and the aeration program, starting the backwashing program P903, and performing reverse air blasting on the filter assembly for a third time period through a backwashing unit self-water production pipeline, wherein the third time period is greater than the second time period and far less than the first time period, and step S900 b;
repeating the water production program P901, the aeration program P902 and the backwashing program P903 according to the steps and the step S900 c;
whether the pressure difference provided by the pressure monitoring unit exceeds the upper limit of the first threshold or not, a first drug cleaning procedure P904 is started at a first cycle timing to start the drug cleaning unit so that the cleaning solution enters the cross-flow filtration unit from the water inlet pipeline to perform soaking cleaning on the filtration assembly for a fourth time period which is much longer than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold range, the first drug cleaning procedure is stopped, and step S900 d.
In some embodiments, the cross-flow filtration unit 10 comprises a water inlet portion 13, a filtration assembly 11, a cross-flow portion 14, a water producing portion 15 and the aeration portion 12, wherein the water inlet portion 13 is communicated with the cross-flow portion 14, the cross-flow portion 14 is communicated with the cross-flow pipeline 50, and the water storage portion 141 and the water producing portion 15 of the cross-flow portion 14 are respectively disposed at two sides of the filtration assembly 11; the cross-flow filtration unit 10 is further configured to receive raw water from the raw water tank 800 into the water inlet portion 13 through the water inlet pipeline 20, and the water inlet portion 13 guides the raw water into the water storage space 141 of the cross-flow portion 14 and allows at least a portion thereof to reach the water production portion 15 after being filtered by the filtration assembly 12.
In some embodiments, a water inlet pump 21 is disposed on the water inlet pipeline 20 for controlling the supply of water to the cross-flow filtration unit 10, and a cross-flow valve 51 is operatively connected to the cross-flow pipeline 50 for controlling the on/off of the cross-flow pipeline; the water production pipeline 30 is provided with a water production valve 31 for controlling the on-off of the water production pipeline 30; the cross-flow section 14 is also in communication with a blowdown line 50 through a blowdown valve 51 for removing backwash foulants during a backwash sequence 903 as well as foulants generated during a drug cleaning sequence 904.
In some embodiments, the cross-flow section 14 comprises a cross-flow pipe 141, a water inlet pipe 131 connected to the water inlet section 13, and a cross-flow pipeline 50, and the flow monitoring unit 40 is operatively connected to one end of the cross-flow pipe 141 to monitor whether water flows out of the cross-flow pipe. Or the flow monitoring unit 40 is operably disposed at one end of the cross-flow pipeline connected to the cross-flow pipe 141 to monitor whether water flows out from the cross-flow pipe.
In some embodiments, the aeration part 12 comprises an aeration pipe 121, the aeration pipe 121 is connected with a compressed air source 123 through an aeration pipeline 122, the aeration pipe 121 is arranged at one side of the water producing part 15 of the filter assembly 11 and is used for guiding compressed air to the surface of the filter assembly 11 for aeration cleaning; the compressed air source is a controllable compressed air source operatively connected to the control unit and configured such that the aeration tube 121, in communication with the compressed air source, directs compressed air to the aeration tube during an aeration sequence P902 and, during a non-aeration sequence, ceases to supply air.
In some embodiments of the invention, the control unit 90 is configured to set a pre-aeration program P905 prior to the water production program P901 such that the aeration section performs a pre-aeration cleaning of the filter assembly for a fixed fifth period of time.
In some embodiments of the present invention, the backwashing unit 60 includes a compressed air source 61, a backwashing control valve 62 for controlling the compressed air source to be led into the water production part through the water production pipeline, and a backwashing sewage discharge part 63 operably connected with the sewage discharge pipeline for discharging sewage after backwashing the cross-flow filtering unit;
in some embodiments of the present invention, the drug cleaning unit 70 includes a drug wash tank 71 operatively connected to the water inlet line, a drug wash pump 72, and a drug wash valve 73, and optionally a fine filter 74, for delivering a cleaning fluid into the water storage section according to a predefined pattern for depth-of-soak cleaning, i.e., cleaning, of the filter assembly during a first drug cleaning procedure P904. The medicine washing box can store at least one medicine washing liquid to soak the filter assembly, and can also store cleaning water to wash the filter assembly and the pipeline after the medicine is soaked and cleaned.
In some embodiments, the pharmaceutical washing tank includes a first washing solution and a second washing solution, and the pharmaceutical washing pump is configured to direct the first washing solution or the second washing solution into the water inlet line to the water storage portion, wherein the first washing solution may be hydrochloric acid and the second washing solution may be sodium chlorate.
In the case where the above-mentioned drug washing tank stores two kinds of washing liquids, the main routine may be configured to further include the following step S900 e: and starting a second medicine cleaning program P905 at a second period which is far larger than the first period at regular time no matter whether the pressure difference provided by the pressure monitoring unit exceeds the upper limit of the first threshold or not, so as to start the medicine cleaning unit, enable a second cleaning liquid to enter the cross-flow filtering unit from the water inlet pipeline to perform soaking cleaning on the filtering component for a fourth time period which is far larger than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold range, and stopping the second medicine cleaning program.
In some embodiments, such as the embodiment shown in fig. 3, the water production program P901 comprises: the water production valve is opened after the cross flow valve is closed, S901a to produce filtered water in the water production line 151 for a first period of time S901 b.
In some embodiments, such as the embodiment shown in fig. 4, the aeration procedure P902 comprises: after the water production valve is closed, the compressed air source leads compressed air S902a to the filter assembly from the water production side through the aeration pipeline; for a second time period S902 b.
In some embodiments, such as the embodiment shown in fig. 5, the backwash program P903 comprises: closing the water inlet valve, the water production valve and the aeration compressed air source, starting the compressed air source 61 of the backwashing unit, opening the backwashing valve 62, and opening the blowdown valve for blowdown after gas-activating backwashing is carried out, wherein the third time period is continued. In some embodiments, the blowdown time is about twice the backwash time.
In some embodiments, such as the embodiment shown in fig. 6, the first pharmaceutical cleaning procedure P904 comprises: evacuating the cross-flow filtration unit at the time point determined by the first cycle S904 a; leading clear water from the medicine washing tank into the cross-flow filtering unit through a water inlet pipeline, and stopping leading the clear water when the flow monitoring unit monitors that liquid flows out of the cross-flow pipe S904 b; then the aeration procedure and the backwashing procedure S904c are performed; then, the configured first cleaning liquid is pumped into the equipment, and is soaked for a fourth time period which is far longer than the first time period or is not soaked until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold range, and then the soaking is stopped S904d, for example, 4-8 hours; and after the soaking time is completed, discharging all the cleaning liquid S904 e; clean water is again introduced into the cross-flow filtration unit through the water inlet line, and an aeration procedure is initiated to remove residual cleaning solution in the cross-flow filtration unit, which is then drained S904 f.
In some embodiments, such as the embodiment shown in fig. 7, the pre-aeration cleaning procedure P905 comprises: opening the cross flow valve, and sending water to be filtered into the water storage part S905a through the water inlet pump; and when the flow monitoring unit is monitored to provide a water outflow signal, starting a compressed air source to perform aeration cleaning on the filter assembly for a fifth time period, and then stopping the aeration S905 b.
In some embodiments, such as the embodiment shown in fig. 8, the second pharmaceutical cleaning procedure P906 comprises: evacuating the cross-flow filtration unit at a time point determined by the second period, S906 a; leading clear water from the medicine washing tank into the cross-flow filtering unit through a water inlet pipeline, and stopping leading the clear water when the flow monitoring unit monitors that liquid flows out of the cross-flow pipe S906 b; then performing an aeration procedure and a backwashing procedure, S906 c; then, the configured second cleaning liquid is pumped into the equipment, and the soaking is stopped for a fourth time period which is far longer than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold range, for example, 4-8 hours, S906 d; and after the soaking time is completed, discharging all the cleaning liquid, S906 e; clean water is introduced into the cross-flow filtration unit again through the water inlet pipeline, and an aeration procedure is started to remove residual cleaning liquid in the cross-flow filtration unit, and then the cleaning liquid is emptied S906 f.
In some embodiments, the cross-flow filtration unit uses a ceramic straight filtration membrane as the filtration component, the filtration precision is 0.1um, and the suspended matter in water defines particles with the standard of 10-0.1 um.
The direct filtration system provided by the invention is basically free from human intervention, and the system can be automatically cleaned at regular time, so that transmembrane pressure difference is ensured to be stabilized within a set threshold value. The system has the advantages that the suspended matters in the effluent can be reduced to below 1mg/L, the turbidity is close to zero, and the system has the characteristics of large effluent flux, low energy consumption, small occupied area, easy backwashing, flux recovery, short backwashing time, simple operation and the like.
Experimental example 1:
the typical working procedure of this experimental example is as follows:
(1) opening a cross flow valve, and pumping water to be filtered into the equipment through a water inlet pump;
(2) when cross-flow water flows out of the equipment, starting aeration, scrubbing for a period of time by aeration, and then stopping aeration;
(3) closing the cross flow valve, opening the water production valve, and adjusting the running water yield and the cross flow of the concentrated water through the flow regulating valve;
(4) stopping water production by the direct filtration system every 9 minutes, aerating and cleaning for 15 seconds, and circularly producing water and aerating for 3 times;
(5) stopping water inflow and water production aeration, starting backwashing and pollution discharge, firstly performing gas circulation and backwashing for 60 seconds, and then performing pollution discharge for 2 minutes;
(6) after backwashing and sewage discharging are finished, the equipment is fed with water again to produce water;
(7) the cleaning system automatically performs one-time hydrochloric acid cleaning by taking 3 days as a period; one sodium hypochlorite washing is automatically carried out for 30 days as a period.
The cleaning steps of the equipment mainly comprise:
7.1 the equipment stops water feeding and water production, and then the equipment is emptied;
7.2, pumping clear water into the equipment until cross flow exists, stopping water inflow, then carrying out aeration, stopping aeration after a period of time, then carrying out reverse gas filling, stopping reverse gas filling after a period of time, and then emptying the equipment;
7.3 operating 3-5 times according to the operation of the step 7.2;
7.4 finally, the prepared cleaning solution is pumped into equipment and soaked for 4 to 8 hours;
7.5, after the soaking time is finished, discharging all the cleaning solution;
7.6, pumping clear water into the equipment, then carrying out aeration cleaning, and emptying the equipment after removing residual cleaning liquid in the equipment;
and finishing cleaning by using the cleaning solution.
The system according to the arrangement can continuously run without any monitoring, and does not need human intervention; and no situation occurs in which the transmembrane pressure difference of the filter element exceeds a set threshold value.
It should be understood that the examples of control routines and control logic executed by the controller are not intended to limit the scope of the present invention. The physical structure of the direct filtration system of the present invention provides a platform in which a backflush unit controller is provided that can configure the timing and mode of providing the back flush and the drug cleaning of the drug cleaning unit based on the signal provided by the flow sensor and the signal provided by the pressure differential module.
As used herein, operatively connected or operatively coupled should be understood to refer to a direct connection or an indirect connection, but in either case, can functionally interconnect components operatively connected to each other.
In this context, the control unit includes any form of controller and its additional components, such as programmable control logic, a single-chip microcomputer, a general-purpose computer, and a special-purpose computer.
It should be noted that the processing portions of the present invention may be implemented in software and/or a combination of software and hardware, for example, as an Application Specific Integrated Circuit (ASIC), a general purpose computer or any other similar hardware device. In one embodiment, the software program of the present invention may be executed by a processor to implement the steps or functions described above. Also, the software programs (including associated data structures) of the present invention can be stored in a computer readable recording medium, such as RAM memory, magnetic or optical drive or diskette and the like. Further, some of the steps or functions of the present invention may be implemented in hardware, for example, as circuitry that cooperates with the processor to perform various steps or functions.
In addition, some of the present invention can be applied as a computer program product, such as computer program instructions, which when executed by a computer, can invoke or provide the method and/or technical solution according to the present invention through the operation of the computer. Program instructions which invoke the methods of the present invention may be stored on a fixed or removable recording medium and/or transmitted via a data stream on a broadcast or other signal-bearing medium and/or stored within a working memory of a computer device operating in accordance with the program instructions. An embodiment according to the invention herein comprises an apparatus comprising a memory for storing computer program instructions and a processor for executing the program instructions, wherein the computer program instructions, when executed by the processor, trigger the apparatus to perform a method and/or solution according to embodiments of the invention as described above.
The foregoing describes preferred embodiments of the present invention, but the spirit and scope of the present invention is not limited to the specific disclosure herein. Those skilled in the art can freely combine and expand the above-described embodiments in accordance with the teachings of the present invention to make further embodiments and applications within the spirit and scope of the present invention. The spirit and scope of the present invention are not to be limited by the specific embodiments but by the appended claims.
Examples of the present application include:
1. an improved direct filtration system is characterized by comprising
The cross-flow filtering unit is used for filtering raw water entering the cross-flow filtering unit through a water inlet pipeline in a cross-flow mode through a filtering assembly and sending the raw water out through a water production pipeline, and the cross-flow filtering unit further comprises an aeration part for carrying out aeration cleaning on the filtering assembly;
a flow monitoring unit operably coupled to the cross-flow portion of the cross-flow filtration unit or a cross-flow conduit operably connected to the cross-flow portion to monitor whether liquid is flowing out of the cross-flow portion;
the pressure monitoring unit is used for monitoring the pressure difference of the inlet and the outlet of the filtering component;
the backwashing unit is operably connected with the water production pipeline and is used for backwashing and cleaning the cross-flow filtering unit;
the medicine cleaning unit is operatively connected with the water inlet pipeline and is used for providing cleaning liquid to the cross-flow filtering unit through the water inlet pipeline so as to soak and clean the filtering component of the cross-flow filtering unit;
a control unit operably connected with the flow monitoring unit, the differential pressure monitoring unit, the backwash unit, and the drug cleaning unit, the control unit configured to:
stopping the water production program after executing the water production program for a first time period, and starting the aeration program to carry out aeration cleaning on the filter assembly for a second time period, wherein the first time period is far greater than the second time period;
circulating the water production program and the aeration program until the pressure difference provided by the pressure monitoring unit is judged to exceed the upper limit of the first threshold range, stopping the water production program and the aeration program, and starting the backwashing program to perform reverse air blasting on the filter assembly for a third time period through a self water production pipeline of the backwashing unit, wherein the third time period is greater than the second time period and far less than the first time period;
repeating the water production procedure, the aeration procedure and the backwashing procedure according to the steps;
and starting a first medicament cleaning program at regular time with a first period no matter whether the pressure difference provided by the pressure monitoring unit exceeds the upper limit of the first threshold value or not, so as to start the medicament cleaning unit, enable a first cleaning solution to enter the cross-flow filtering unit from the water inlet pipeline to perform soaking cleaning on the filtering assembly for a fourth time period which is far longer than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold value range, and stopping the soaking cleaning.
2. An improved direct filtration system according to example 1, wherein: the cross-flow filtering unit comprises a water inlet part, a filtering component, a cross-flow part, a water producing part and an aeration part, wherein the water inlet part is communicated with the cross-flow part, the cross-flow part is communicated with the cross-flow pipeline, and a water storage part and the water producing part of the cross-flow part are respectively arranged at two sides of the filtering component; the cross-flow filtration unit is further configured to access raw water to the water inlet portion through the water inlet pipeline, the water inlet portion guides the raw water to the water storage space of the cross-flow portion, and at least one part of the raw water reaches the water production portion after being filtered by the filtration assembly.
3. An improved direct filtration system according to example 1 or 2, characterized in that: the cross flow pipeline is operatively connected with a cross flow valve to control the on-off of the cross flow pipeline; a water production valve is arranged on the water production pipeline and used for controlling the on-off of the water production pipeline; the cross flow part is also communicated with a sewage discharge pipeline through a sewage discharge valve and is used for removing back washing dirt and dirt generated in a medicine cleaning procedure in a back washing procedure.
4. An improved direct filtration system according to any one of examples 1 to 3, wherein: the cross-flow part comprises a cross-flow pipe, a water inlet pipe connected with the water inlet part and a cross-flow pipeline, and the flow monitoring unit is operatively connected with one end of the cross-flow pipe to monitor whether water flows out of the cross-flow pipe.
5. An improved direct filtration system according to any one of examples 1 to 4, wherein: the aeration part comprises an aeration pipe, the aeration pipe is connected with a compressed air source through an aeration pipeline, and the aeration pipe is arranged on one side (of a water storage part) of a water production pipe of the filter assembly and used for guiding compressed air to the surface of the filter assembly for aeration cleaning; the aerator pipe is configured to communicate with a compressed air source to direct compressed air into the aerator pipe.
6. An improved direct filtration system according to any one of examples 1 to 5, wherein: the control unit is configured to set a pre-aeration program before the water production program so that the aeration part performs pre-aeration cleaning on the filter assembly at a fixed fifth time period.
7. An improved direct filtration system according to any one of examples 1 to 6, wherein: the backwashing unit also comprises a sewage discharge part which is operably connected with the water production pipeline and is used for backwashing and discharging sewage of the cross-flow filtering unit.
8. An improved direct filtration system according to any one of examples 1 to 7, wherein: the medicine cleaning unit comprises a medicine washing tank and a medicine washing pump which are operably connected with the water inlet pipeline and used for sending cleaning liquid into the water storage part in a medicine cleaning procedure so as to carry out soaking depth cleaning on the filter assembly.
9. An improved direct filtration system according to any one of examples 1 to 8, wherein: the drug washing tank comprises a first washing liquid and a second washing liquid, and the drug washing pump is configured to guide the first washing liquid or the second washing liquid into the water inlet pipeline so as to be guided to the water storage part.
10. The improved direct filtration system of example 9, wherein: and starting a first medicament cleaning program at a second period which is far larger than the first period at regular time no matter whether the pressure difference provided by the pressure monitoring unit exceeds the upper limit of the first threshold or not, so as to start the medicament cleaning unit, enable a second cleaning solution to enter the cross-flow filtering unit from the water inlet pipeline to perform soaking cleaning on the filtering assembly for a fourth time period which is far larger than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold range, and stopping the soaking cleaning.
11. An improved direct filtration system according to any of the preceding examples, wherein: the pre-aeration cleaning program comprises the following steps: opening the cross flow valve, and sending water to be filtered into the water storage part through the water inlet pump; and when the flow monitoring unit is monitored to provide a water outflow signal, starting a compressed air source to carry out aeration cleaning on the filter assembly for a fifth time period, and then stopping aeration.
12. An improved direct filtration system according to any of the preceding examples, wherein: the water production program comprises: the cross-flow valve is closed and the water production valve is opened to produce filtered water at the water production line for a first period of time.
13. An improved direct filtration system according to any of the preceding examples, wherein: the aeration program comprises: and after the water production valve is closed, the compressed air source leads compressed air to the filtering component from the water production side through the aeration pipeline for a second time period.
14. An improved direct filtration system according to any of the preceding examples, wherein: the backwashing procedure comprises: closing the water inlet valve, the water production valve and the compressed air source, starting the backwashing unit, firstly moving the gas, backwashing and then opening the blow-down valve for blow-down, and lasting for a third time period.
15. An improved direct filtration system according to any of the preceding examples, wherein: the blowdown time is about twice the backwash time.
16. An improved direct filtration system according to any of the preceding examples, wherein: the first pharmaceutical cleaning procedure comprises: evacuating the cross-flow filtration unit at a time point determined by the first cycle; leading clear water from the medicine washing tank into the cross-flow filtering unit through a water inlet pipeline, and stopping leading the clear water when the flow monitoring unit monitors that liquid flows out of the cross-flow pipe; then an aeration program and a backwashing program are executed; then, the prepared first cleaning liquid is pumped into the equipment, and soaked for a fourth time period which is far longer than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold range, the medicine cleaning program is stopped, for example, 4-8 hours; and after the soaking time is finished, discharging all the cleaning liquid; and introducing the clean water into the cross-flow filtering unit through the water inlet pipeline again, starting an aeration program to remove residual cleaning liquid in the cross-flow filtering unit, and then emptying.
17. An improved direct filtration system according to any of the preceding examples, wherein: the second pharmaceutical cleaning procedure comprises: evacuating the cross-flow filtration unit at a time point determined by the second period; leading clear water from the medicine washing tank into the cross-flow filtering unit through a water inlet pipeline, and stopping leading the clear water when the flow monitoring unit monitors that liquid flows out of the cross-flow pipe; then an aeration program and a backwashing program are executed; then, the prepared second cleaning liquid is pumped into the equipment, and is soaked for a fourth time period which is far longer than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold range, the medicine cleaning program is stopped; and after the soaking time is finished, discharging all the cleaning liquid; and introducing the clean water into the cross-flow filtering unit through the water inlet pipeline again, starting an aeration program to remove residual cleaning liquid in the cross-flow filtering unit, and then emptying.
18. An improved direct filtration system according to any of the preceding examples, wherein: the cross-flow filtration unit adopts a ceramic direct filtration membrane as a filtration component, the filtration precision is 0.1um, and the definition standard of suspended matters in water is particles between 10 and 0.1 um. 19. An improved direct filtration process comprising:
stopping the water production program after the water production program is executed for a first time period,
starting an aeration program to carry out aeration cleaning on the filter assembly for a second time period, wherein the first time period is far longer than the second time period;
circulating the water production program and the aeration program until the pressure difference between the inlet and the outlet of the filter unit exceeds the upper limit of the first threshold range, stopping the water production program and the aeration program, starting the backwashing program, and performing reverse air blasting on the filter assembly for a third time period through a self water production pipeline of the backwashing unit, wherein the third time period is greater than the second time period and far less than the first time period;
repeating the water production procedure, the aeration procedure and the backwashing procedure according to the steps;
and starting a first medicament cleaning program at a first period timing no matter whether the pressure difference provided by the pressure monitoring unit exceeds the upper limit of the first threshold value or not, so as to start the medicament cleaning unit, enable a first cleaning solution to enter the cross-flow filtering assembly from the water inlet pipeline to perform soaking cleaning on the filtering assembly for a fourth time period which is far longer than the first time period or until the pressure difference is close to the lower limit of the first threshold value range, and stopping the soaking cleaning.
20. An improved direct filtration process according to example 19, wherein: the control unit is configured to set a pre-aeration program before the water production program so that the aeration part performs pre-aeration cleaning on the filter assembly at a fixed fifth time period.
21. An improved direct filtration process according to example 19, wherein: the first pharmaceutical cleaning procedure comprises: evacuating the cross-flow filtration unit at a time point determined by the first cycle; leading clear water from the medicine washing tank into the cross-flow filtering unit through a water inlet pipeline, and stopping leading the clear water when the flow monitoring unit monitors that liquid flows out of the cross-flow pipe; then an aeration program and a backwashing program are executed; then, the prepared first cleaning liquid is pumped into the equipment, and soaked for a fourth time period which is far longer than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold range, the medicine cleaning program is stopped, for example, 4-8 hours; and after the soaking time is finished, discharging all the cleaning liquid; and introducing the clean water into the cross-flow filtering unit through the water inlet pipeline again, starting an aeration program to remove residual cleaning liquid in the cross-flow filtering unit, and then emptying.
22. An improved direct filtration process according to example 19, wherein: the second pharmaceutical cleaning procedure comprises: evacuating the cross-flow filtration unit at a time point determined by the second period; leading clear water from the medicine washing tank into the cross-flow filtering unit through a water inlet pipeline, and stopping leading the clear water when the flow monitoring unit monitors that liquid flows out of the cross-flow pipe; then an aeration program and a backwashing program are executed; then, the prepared second cleaning liquid is pumped into the equipment, and is soaked for a fourth time period which is far longer than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold range, the medicine cleaning program is stopped; and after the soaking time is finished, discharging all the cleaning liquid; and introducing the clean water into the cross-flow filtering unit through the water inlet pipeline again, starting an aeration program to remove residual cleaning liquid in the cross-flow filtering unit, and then emptying.
Claims (10)
1. An improved direct filtration system is characterized by comprising
The cross-flow filtering unit is used for filtering raw water entering the cross-flow filtering unit through a water inlet pipeline in a cross-flow mode through a filtering assembly and sending the raw water out through a water production pipeline, and the cross-flow filtering unit further comprises an aeration part for carrying out aeration cleaning on the filtering assembly;
a flow monitoring unit operably coupled to the cross-flow portion of the cross-flow filtration unit or a cross-flow conduit operably connected to the cross-flow portion to monitor whether liquid is flowing out of the cross-flow portion;
the pressure monitoring unit is used for monitoring the pressure difference of the inlet and the outlet of the filtering component;
the backwashing unit is operably connected with the water production pipeline and is used for backwashing and cleaning the cross-flow filtering unit;
the medicine cleaning unit is operatively connected with the water inlet pipeline and is used for providing cleaning liquid to the cross-flow filtering unit through the water inlet pipeline so as to soak and clean the filtering component of the cross-flow filtering unit;
a control unit operably connected with the flow monitoring unit, the differential pressure monitoring unit, the backwash unit, and the drug cleaning unit, the control unit configured to:
stopping the water production program after executing the water production program for a first time period, and starting the aeration program to carry out aeration cleaning on the filter assembly for a second time period, wherein the first time period is far greater than the second time period;
circulating the water production program and the aeration program until the pressure difference provided by the pressure monitoring unit is judged to exceed the upper limit of the first threshold range, stopping the water production program and the aeration program, and starting the backwashing program to perform reverse air blasting on the filter assembly for a third time period through a self water production pipeline of the backwashing unit, wherein the third time period is greater than the second time period and far less than the first time period;
repeating the water production procedure, the aeration procedure and the backwashing procedure according to the steps;
and starting a first medicament cleaning program at regular time with a first period no matter whether the pressure difference provided by the pressure monitoring unit exceeds the upper limit of the first threshold value or not, so as to start the medicament cleaning unit, enable a first cleaning solution to enter the cross-flow filtering unit from the water inlet pipeline to perform soaking cleaning on the filtering assembly for a fourth time period which is far longer than the first time period or until the pressure difference provided by the pressure monitoring unit is judged to be close to the lower limit of the first threshold value range, and stopping the soaking cleaning.
2. The improved direct filtration system according to claim 1, wherein: the cross-flow filtering unit comprises a water inlet part, a filtering component, a cross-flow part, a water producing part and an aeration part, wherein the water inlet part is communicated with the cross-flow part, the cross-flow part is communicated with the cross-flow pipeline, and a water storage part and the water producing part of the cross-flow part are respectively arranged at two sides of the filtering component; the cross-flow filtration unit is further configured to access raw water to the water inlet portion through the water inlet pipeline, the water inlet portion guides the raw water to the water storage space of the cross-flow portion, and at least one part of the raw water reaches the water production portion after being filtered by the filtration assembly.
3. The improved direct filtration system according to claim 1, wherein: the cross flow pipeline is operatively connected with a cross flow valve to control the on-off of the cross flow pipeline; a water production valve is arranged on the water production pipeline and used for controlling the on-off of the water production pipeline; the cross flow part is also communicated with a sewage discharge pipeline through a sewage discharge valve and is used for removing back washing dirt and dirt generated in a medicine cleaning procedure in a back washing procedure.
4. The improved direct filtration system according to any one of claim 1, wherein: the cross-flow part comprises a cross-flow pipe, a water inlet pipe connected with the water inlet part and a cross-flow pipeline, and the flow monitoring unit is operatively connected with one end of the cross-flow pipe to monitor whether water flows out of the cross-flow pipe.
5. The improved direct filtration system according to claim 1, wherein: the aeration part comprises an aeration pipe, the aeration pipe is connected with a compressed air source through an aeration pipeline, and the aeration pipe is arranged on one side (of a water storage part) of a water production pipe of the filter assembly and used for guiding compressed air to the surface of the filter assembly for aeration cleaning; the aerator pipe is configured to communicate with a compressed air source to direct compressed air into the aerator pipe.
6. The improved direct filtration system according to claim 1, wherein: the control unit is configured to set a pre-aeration program before the water production program so that the aeration part performs pre-aeration cleaning on the filter assembly at a fixed fifth time period.
7. The improved direct filtration system according to claim 1, wherein: the backwashing unit also comprises a sewage discharge part which is operably connected with the water production pipeline and is used for backwashing and discharging sewage of the cross-flow filtering unit.
8. The improved direct filtration system according to claim 1, wherein: the medicine cleaning unit comprises a medicine washing tank and a medicine washing pump which are operably connected with the water inlet pipeline and used for sending cleaning liquid into the water storage part in a medicine cleaning procedure so as to carry out soaking depth cleaning on the filter assembly.
9. The improved direct filtration system according to claim 8, wherein: the drug washing tank comprises a first washing liquid and a second washing liquid, and the drug washing pump is configured to guide the first washing liquid or the second washing liquid into the water inlet pipeline so as to be guided to the water storage part.
10. An improved direct filtration process comprising:
stopping the water production program after the water production program is executed for a first time period,
starting an aeration program to carry out aeration cleaning on the filter assembly for a second time period, wherein the first time period is far longer than the second time period;
circulating the water production program and the aeration program until the pressure difference between the inlet and the outlet of the filter unit exceeds the upper limit of the first threshold range, stopping the water production program and the aeration program, starting the backwashing program, and performing reverse air blasting on the filter assembly for a third time period through a self water production pipeline of the backwashing unit, wherein the third time period is greater than the second time period and far less than the first time period;
repeating the water production procedure, the aeration procedure and the backwashing procedure according to the steps;
and starting a first medicament cleaning program at a first period timing no matter whether the pressure difference provided by the pressure monitoring unit exceeds the upper limit of the first threshold value or not, so as to start the medicament cleaning unit, enable a first cleaning solution to enter the cross-flow filtering assembly from the water inlet pipeline to perform soaking cleaning on the filtering assembly for a fourth time period which is far longer than the first time period or until the pressure difference is close to the lower limit of the first threshold value range, and stopping the soaking cleaning.
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