CN207253832U - Active sand filter plant and sewage filter system - Google Patents

Abstract

The utility model provides a kind of active sand filter plant and sewage filter system, is related to technical field of water treatment equipment, which includes active sand filter, controller, pressure sensor and single board computer；The inner tubal wall of sand extraction tube in active sand filter sets ceramic layer, the end face of splash-back face sand-washing device sets at least one detecting the pressure sensor of sand aqueous mixtures pressure, pressure signal can be delivered to single board computer by pressure sensor, single board computer can handle the pressure signal and be delivered to controller, when controller detects pressure anomaly, it can control and carry sand pump and be turned on and off according to certain time.Sand extraction tube is rinsed repeatedly using the mixture of gas, filter sand, water, to have the function that to dredge sand extraction tube.Sewage filter system includes Master Control Room and above-mentioned active sand filter plant, also sets up display to show pressure value in Master Control Room, facilitates staff to understand the operation conditions of each active sand filter plant in time.

Description

Active sand filter plant and sewage filter system

Technical field

It the utility model is related to technical field of water treatment equipment, more particularly to a kind of active sand filter plant and sewage water filtration System.

Background technology

Active sand filter relies primarily on the mesh that internal filtrate (i.e. active sand) reaches suspended matter retention in sewage purification , influent quality is not up to standard, equipment fault, pipeline blockage or the gas flow factor such as not enough may all influence the backwash of filtrate, Back washing strength is inadequate, and water outlet is not up to standard, while can cause the hardened of active sand filtering material.

Once active sand is hardened or part is hardened, then whole filtration system all cisco unity malfunctions.After active sand is hardened such as Need to repair, workload will be very big.All filtrates are completely drawn out first, rinses well, sieve again, whether are overhauled because hardened Cause section components to damage, be backfilled to if any then needing to change, then by the filtrate rinsed well and sieved in filter tank.Maintenance process Time and effort consuming, and in maintenance process, sewage cannot be processed, shorten equipment normal service life.Therefore, filtrate is hardened to activity Sand filtration system influences most serious.

The inspection work of original system for filtering active sand has water factory worker completion, when filtering layer is hardened, filter tank internal water Position can raise, when inspection worker sees water level rise, it is believed that equipment breaks down, and equipment is overhauled.It is this relatively to check knot Fruit may be delayed the optimal repair time, add cost of labor by checking that worker's oneself factor is had a great influence.

In addition, the sand extraction tube in traditional activated sand filter uses polypropylene PPR materials, conventional polypropylene PPR materials carry Sandpipe has the disadvantages that：(1) the lifting medium of the sand extraction tube in active sand filter is particle diameter for 1.2-2.0mm, uneven Coefficient is less than the natural sea sand filtrate that 1.5, silicon content is high, hardness is big, than other conventional pumped (conveying) medium Ru Shui, oil etc. to pipeline material The wearability of matter requires higher, is found in multiple projects run, and conventional polypropylene PPR pipe road is in lifting quartz sand filter media During, tube wall occurs grinding cut, non-uniform wear down by quartz sand or even grinds the phenomenon of leakage, its average life is only Just needed to change for 2-3, increase replacement cost, operation expense；(2) sand extraction tube inner wall is rough causes to propose sand conveying resistance Power becomes larger, and it is bad to cut dirty filtrate cleaning performance；If mill leakage finds that can equally cause filtrate to clean asks not in time Topic.Filtrate cleans not in time, and waste water filtering effect is bad, and water outlet is not up to standard, and for a long time, the pollutant being attached on filtrate Mycoderm can be formed under anaerobic environment causes filtrate hardened, filter tank failure.Filter tank is once hardened, and solution difficulty is larger, expense It is higher, greatly increase operation expense.

Utility model content

First purpose of the utility model is to provide a kind of active sand filter plant, is filtered with solving existing active sand Hand inspection precision is low existing for equipment, it is impossible to timely processing activity sand filtering material it is hardened, and using polypropylene PPR materials The low technical problem of sand extraction tube wearability.

Second purpose of the utility model be to provide a kind of sewage filter system, and the sewage filter system is using above-mentioned Active sand filter plant.

Based on above-mentioned first purpose, active sand filter plant provided by the utility model, including active sand filter, control Device, pressure sensor and single board computer processed；

The activity sand filter includes sand extraction tube, and ceramic layer is set in the sand extraction tube tube wall, the sand extraction tube Lower part, which is connected with, carries sand pump, and top is connected with sand-washing device；Splash-back, the splash-back face institute are provided with the top of the sand-washing device State sand-washing device end face set it is at least one detecting the pressure sensor of sand aqueous mixtures pressure, the pressure sensor Pressure signal can be delivered to the single board computer, the single board computer can handle the pressure signal and be delivered to controller, The controller carries being turned on and off for sand pump described in can controlling.

Further, pressure threshold is provided with the controller, when the pressure of pressure sensor detection is decreased to necessarily After threshold value, the controller, which can be output control signals to, carries sand pump, and control carries sand pump according to preset time repeatedly starting and stopping, with right Sand extraction tube is cleaned.

Further, support tube is provided with the outside of the sand extraction tube, is provided between the sand extraction tube and the support tube Multiple fixing pieces；The sand extraction tube can be fixed in the support tube by the fixing piece.

Further, tank body is further included, and central tube and water distributor are provided with the tank body；

The water distributor is arranged at the lower part of the central tube and is interconnected；

The support tube penetrates in the central tube and the water distributor from top to bottom, the support tube and the central tube Between be provided with gap.

Further, water inlet pipe is provided with the side wall of the tank body, and the water inlet pipe connects with the central tube It is logical.

Further, liquid level gauge is further included；The liquid level gauge is detachably connected on water inlet pipe in active sand filter On tube wall, and the liquid level gauge bottom is connected with the water inlet pipe；

Current can be entered in the liquid level gauge by the water inlet pipe, and by the liquid level gauge show it is described into The height of liquid level in water branch pipe.

Further, through hole is set on the tube wall of the water inlet pipe, and the bottom of the liquid level gauge can be placed in described In through hole.

Further, plug is further included, the plug can block the through hole on the water inlet pipe.

Further, further include half blind plate, half blind plate is arranged at the water inlet end of the water inlet pipe, and it is described into Water inlet openings are left between water branch pipe and half blind plate.

Based on above-mentioned second purpose, a kind of sewage filter system provided by the utility model, including Master Control Room and above-mentioned Active sand filter plant；

Controller in the active sand filter plant is integrated in the Master Control Room, meanwhile, set in the Master Control Room Display, to show the pressure value of the detection of the pressure sensor in each active sand filter plant.

Beneficial effect：

Active sand filter plant provided by the utility model, including active sand filter, controller, pressure sensor and Single board computer；Active sand filter includes sand extraction tube, sets ceramic layer in the tube wall of sand extraction tube, the lower part of sand extraction tube, which is connected with, to be carried Sand pump, top are connected with sand-washing device；Splash-back is provided with the top of sand-washing device, the end face of sand-washing device described in splash-back face is set It is at least one to detect the pressure sensor of sand aqueous mixtures pressure, pressure signal can be delivered to veneer by pressure sensor Machine, single board computer can handle the pressure signal and be delivered to controller, controller can control the unlatching for carrying sand pump or Close.

Gases at high pressure are filled with sand pump to carrying using extraneous high-pressure air source, can be by the sky of active sand filter bottom The mixture of gas, dirty sand and water is lifted to sand-washing device by sand extraction tube and cleaned, and filter sand is separated with pollutant and reaches clear The purpose washed, filter sand returns to casting bed after over cleaning using dead weight, and cleaning sullage is then discharged to the external world.Also, washed-out sand process Carried out together with filter process so that filter sand can be carried out continuously cleaning, to improve the filter effect to sewage of filtrate.

In addition, air, filter sand and water mixture up flow through carry sand pump outlet enter sand-washing device, air, Sha Heshui Mixture can to the pressure sensor of splash-back lower part apply upward pressure, pressure sensor can convey pressure signal To single board computer, single board computer processing pressure signal and can be delivered to controller, be not normally functioning when sand extraction tube blocks, casting bed plate When knot or part hardened situations such as causing backwash process water lift not carry sand occur, sand extraction tube must not in active sand filter Smoothness does not carry sand, then gas, filter sand, the mixture of water reduce the pressure of pressure sensor, can be controlled by controller System carries sand pump and carries out being turned on and off acting according to certain time, and sand extraction tube is carried out repeatedly using the mixture of gas, filter sand, water Rinse, to have the function that to dredge sand extraction tube, meanwhile, by the way that pressure monitor can also for casting bed, hardened or part be hardened causes Backwash process water lift, which does not carry situations such as sand, to be occurred being found and being handled in time, ensures the normal fortune of active sand filter plant OK.

Ceramics have very strong resistance to scraping property of quarter, also can keep shape injury-free for a long time even if by various hard thing effects, i.e., Make to have in quartz sand filter media that a certain proportion of sand grains is non-round, corner angle are sharp, ceramic layer, which also can guarantee that, occurs without cut, wear down and mill The phenomenon of leakage；Since the ceramic layer on the inside of sand extraction tube has very strong wearability so that the service life of sand extraction tube entirety extends； Failure rate is minimized, also, reduces equipment cost.

Sewage filter system provided by the utility model includes Master Control Room and above-mentioned active sand filter plant；Active sand Controller in filter plant is integrated in Master Control Room, meanwhile, display is set in Master Control Room, to show each active sand mistake The pressure value of the pressure sensor detection in equipment is filtered, facilitates staff to understand the fortune of each active sand filter plant in time Row situation；It is also equipped with the above-mentioned advantage of active sand filter plant.

Brief description of the drawings

, below will be right in order to illustrate more clearly of the utility model embodiment or technical solution of the prior art Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, describe below In attached drawing be the utility model some embodiments, for those of ordinary skill in the art, do not paying creativeness On the premise of work, other attached drawings can also be obtained according to these attached drawings.

Fig. 1 is the structure diagram for the active sand filter plant (assembling liquid level gauge) that the utility model embodiment provides；

Fig. 2 is the partial enlarged view at A in Fig. 1；

Fig. 3 is the structure diagram of splash-back in the active sand filter plant that the utility model embodiment provides；

Fig. 4 is the structure diagram of the sand extraction tube mouth of pipe in the active sand filter plant that the utility model embodiment provides；

Fig. 5 is the control principle schematic diagram for the active sand filter plant that the utility model embodiment provides；

Fig. 6 is the structure diagram for the active sand filter plant (assembling plug) that the utility model embodiment provides；

Fig. 7 is sand extraction tube dimensional structure diagram in the active sand filter plant that the utility model embodiment provides；

Fig. 8 is the principle schematic for the sewage filter system that the utility model embodiment provides.

Icon：100- activity sand filters；110- sand extraction tubes；120- carries sand pump；121- ceramic layers；130- sand-washing devices； 140- splash-backs；150- support tubes；160- tank bodies；170- central tubes；180- water distributors；190- water inlet pipes；191- through holes； 200- controllers；300- pressure sensors；400- single board computers；500- alarm devices；600- liquid level gauges；700- plugs；800- half Blind plate；10- Master Control Rooms；20- active sand filter plants.

Embodiment

It is new to this practicality below in conjunction with attached drawing to make the purpose of this utility model, technical solution and advantage clearer The technical solution of type carries out clear, complete description.Obviously, described embodiment is only the part implementation of the utility model Example, instead of all the embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making wound All other embodiments obtained under the premise of the property made work, shall fall within the protection scope of the present invention.

As Figure 1-Figure 5, a kind of active sand filter plant is present embodiments provided, including active sand filter 100, Controller 200, pressure sensor 300 and single board computer 400.

The activity sand filter 100 includes sand extraction tube 110, and the lower part of sand extraction tube 110, which is connected with, carries sand pump 120, is carrying The inner wall of sandpipe 120 is provided with ceramic layer 121 (refer to Fig. 2), and the top of sand extraction tube 120 is connected with sand-washing device 130；Sand-washing device 130 tops are provided with splash-back 140, when it is implemented, splash-back 140 is arranged on by stent washes the husky top of device 130, splash-back The end face of 140 face sand-washing devices 130 sets at least one to detect the pressure sensor 300 of sand aqueous mixtures pressure, pressure Pressure signal can be delivered to single board computer 400 by force snesor 300, and single board computer 400 processing pressure signal and can be delivered to control Device 200 processed, controller 200, which can control, carries being turned on and off for sand pump 120.

Above-mentioned sand extraction tube 120 is made of polypropylene PPR materials, and ceramic layer 121 is set in 120 inner wall of sand extraction tube, pottery Porcelain has good resistance to scraping property of quarter, even if having in quartz sand filter media, a certain proportion of sand grains is non-round, corner angle are sharp, ceramic layer 121 It is not easy to the phenomenon for cut, wear down and mill leakage occur；Since the ceramic layer 121 of the inner side of sand extraction tube 120 has good wearability, So that the service life of the entirety of sand extraction tube 120 can extend to the several years；In addition to above advantage, ceramics are also equipped with the feature of environmental protection, inner wall light Sliding, the advantages that transporting resistance is small, cheap moderate；To sum up, ceramic layer 121 is set so that sand extraction tube in the inner side of sand extraction tube 120 120 while polypropylene PPR material advantages are remained, also effectively solve polypropylene PPR it is resistance to carve scraping property and wearability compared with The problem of weak.So as to be more advantageous to dirty sand and be transported in sand-washing device 300 and cleaned by carrying sand pump 200 and sand extraction tube 120. Active sand filter plant provided in this embodiment is set by setting the above-mentioned sand extraction tube 120 with ceramic layer 121 to effectively increase Standby service life, is minimized failure rate, also, reduces equipment cost and operation and maintenance difficulty.

Refer to Fig. 4, active sand filter plant provided in this embodiment in the specific implementation, multiple pressure sensors 300 Array distribution is on splash-back 140, fully to detect the pressure value of sand aqueous mixtures.

Carry sand pump 120 and use air lift, when extraneous high-pressure air source to carry be filled with gases at high pressure in sand pump 120 when, energy It is enough that the mixture of the air of active 100 bottom of sand filter, dirty sand and water is lifted into sand-washing device 130 by sand extraction tube 110 Being cleaned, filter sand and pollutant are separated and achieve the purpose that cleaning, filter sand returns to casting bed after over cleaning using dead weight, and Cleaning sullage is then discharged to the external world.Also, washed-out sand process carries out together with filter process so that filter sand can be carried out continuously Cleaning, to improve the filter effect to sewage of filtrate.

In addition, the mixture in air, filter sand and water up flows through and proposes the outlet of sand pump 120 and enter sand-washing device 130, air, The mixture of sand and water, which can apply the pressure sensor 300 of 140 lower part of splash-back, to upward pressure, 300 energy of pressure sensor Enough that pressure signal is delivered to single board computer 400, single board computer 400 processing pressure signal and can be delivered to controller 200, when carrying sand Pipe 110 block be not normally functioning, casting bed is hardened or part hardened situations such as causing backwash process water lift not carry sand occurs When, sand extraction tube 110 must not be smooth or carry sand in active sand filter 100, then the mixture of gas, filter sand, water is to pressure The pressure of force snesor 300 reduces, and can be controlled by controller 200 and carry sand pump 120 and opened or closed according to certain time Action is closed, sand extraction tube 110 is rinsed repeatedly using the mixture of gas, filter sand, water, to reach the work of dredging sand extraction tube 110 With, meanwhile, by the way that pressure monitor can also for casting bed, hardened or part be hardened causes backwash process water lift not carry sand etc. Being found and being handled in time occur in situation, ensures the normal operation of active sand filter plant.

As a preferred embodiment, pressure threshold is provided with controller 200, is detected when pressure sensor 300 After pressure is decreased to certain threshold value, controller 200, which can be output control signals to, carries sand pump 120, and control carries sand pump 120 according to pre- If time repeatedly starting and stopping, to be cleaned to sand extraction tube 110.

The pressure detected by controller 200 for pressure sensor 300 monitors in real time, it can be ensured that active sand mistake Equipment is filtered when operation exception caused by 110 plugging reason of sand extraction tube occurs, dredges sand extraction tube 110, real-time guarantees activity in time Sand filter plant works normally.

As a preferred embodiment, pressure sensor 300 passes through wireless network connection with single board computer 400.

Wherein, pressure sensor 300 carries out data transmission mode with single board computer 400 by wireless network, can reduce profit With signal wire carry out data transmission bringing intake, the security risk such as short circuit, can also reduce deploying to ensure effective monitoring and control of illegal activities for circuit.

Fig. 5 is refer to, as a preferred embodiment, further includes alarm device 500, alarm device 500 and controller 200 signals connect, and after the pressure that pressure sensor 300 detects is decreased to certain predetermined pressure threshold, controller 200 can be defeated Go out signal to 500 signal an alert of alarm device.The alarm device 500 can select the common device such as warning lamp or loudspeaker Part.

Using alarm device 500, when active sand filter plant is abnormal situation, staff can be notified in time.

Fig. 1 is refer to, as a preferred embodiment, the outside of sand extraction tube 110 is provided with support tube 150, sand extraction tube 110 Multiple fixing pieces are provided between support tube 150；

Sand extraction tube 110 can be fixed in support tube 150 by fixing piece.

Prevent it is produced during sand, washed-out sand is proposed from rocking for sand extraction tube 110 is fixedly mounted, sand extraction tube 110 is placed in Inside support tube 150, also, multiple fixing pieces, the inner side of fixing piece are evenly arranged between sand extraction tube 110 and support tube 150 It is connected with the outer wall of sand extraction tube 110, outside is connected with the inner wall of support tube 150, so as to which sand extraction tube 110 is secured firmly to In support tube 150, effectively alleviate and carry the problem of sand extraction tube 110 during sand, washed-out sand rocks.

As a preferred embodiment, above-mentioned active sand filter 100 further includes tank body 160, and in tank body 160 Inside it is provided with central tube 170 and water distributor 180；

Water distributor 180 is arranged at the lower part of central tube 170, and is interconnected between the two.

As a preferred embodiment, support tube 150 penetrates in central tube 170 and water distributor 180 from top to bottom；

Gap is provided between support tube 150 and central tube 170.

As a preferred embodiment, the lower part of tank body 160 is provided with the taper bucket, and the bottom of the taper bucket is provided with sediment outflow Mouthful.

As a preferred embodiment, be provided with water inlet pipe 190 on the side wall of tank body 160, and water inlet pipe 190 with Central tube 170 connects.

Water flows into central tube 170 by the water inlet pipe 190 in equipment, and by between central tube 170 and support tube 150 Gap be flowed into water distributor 180 so that water can pass through water distributor evenly into casting bed bottom, and then, water is to upstream It is dynamic, and sufficiently and uniformly contacted with the filtrate in tank body, so that some impurity in sewage are trapped within filter bed, most Eventually, the water after media filtration is pooled to water outlet and discharges.

Fig. 1 is continued referring to, as a preferred embodiment, active sand filter plant provided in this embodiment further includes Liquid level gauge 600；Liquid level gauge 600 is detachably connected in active sand filter on the tube wall of water inlet pipe 190, and the liquid level gauge 600 bottoms are connected with water inlet pipe 190；Current can be entered in liquid level gauge 600 by the water inlet pipe 190, and are led to Cross the height that liquid level gauge 600 shows liquid level in water inlet pipe 190.

When it is implemented, through hole 191 can be set on the tube wall of water inlet pipe 190, the bottom of liquid level gauge 600 can hold It is placed in through hole 191, makes to connect between water inlet pipe and liquid level gauge 600.For example, above-mentioned can use screw thread between the two Connection or the common connection mode such as flanged joint, and fitted seal circle is to reach sealing effect.

Fig. 6 is refer to, as a preferred embodiment, active sand filter plant provided in this embodiment further includes plug 700, plug 700 can block the through hole 191 on the water inlet pipe 190.

Fig. 7 is refer to, as a preferred embodiment, active sand filter plant provided in this embodiment further includes half-blindness Plate 800, half blind plate 800 are arranged at the water inlet end of water inlet pipe 190, and left between 190 and half blind plate 800 of water inlet pipe into Water opening.

The active sand filter plant that the utility model embodiment provides passes through liquid level gauge on the basis of traditional structure is continued to use Water level in 600 pairs of water inlet pipes 190 is monitored, and according to water level regulation in active sand filter plant water inlet pipe At 190 water inlet end set half blind plate 800 size, and the area of half blind plate 800 need to according to water level in water inlet pipe 190 and It is fixed, different degrees of closure is carried out to the water inlet openings of water inlet pipe 190 by half blind plate 800 of different area, so as to By adjusting, respectively set active sand filter plant can ensure that inflow is consistent in openings of sizes filtering ponds, and flow velocity is identical, Increase treatment effect.

Situation is monitored according to liquid level gauge 600, half blind plate 800, such energy are correspondingly arranged at the water inlet end of water inlet pipe 190 Enough water distributions for controlling active sand filter very accurately by adjusting the sectional area of half blind plate 800 at 190 water inlet end of water inlet pipe, And then it ensure that each complete equipment even water distribution in bed rearrangement sand filter.

It should be noted that when needing to carry out water flowing experiment, and half blind plate 800 being configured according to experimental result, it is necessary to will Liquid level gauge 600 is installed on water inlet pipe 190, can be by liquid level gauge 600 from water inlet pipe when that need not carry out water flowing experiment Under being dismantled on 190, then plug 700 is recycled to be blocked, to prevent water stream from being reserved from through hole 191.

In the optional technical solution of the present embodiment, the shape of half blind plate 800 and cross section at the water inlet end of water inlet pipe 190 Shape it is corresponding, and the area of half blind plate 800 be less than 190 water inlet end of water inlet pipe at cross-sectional area.

In the optional technical solution of the present embodiment, water inlet pipe 190 uses circular cross section, correspondingly, half blind plate 800 Using large semicircle or small semicircle., can be with herein it should be noted that the cross-sectional area of water inlet pipe 190 is not limited to circle Using square or other polygons, as long as disclosure satisfy that actual needs, it is not limited herein.

In addition, the utility model additionally provides a kind of sewage filter system, Fig. 8 is refer to, which includes Master Control Room 10 and above-mentioned active sand filter plant 20；

Controller in active sand filter plant 20 is integrated in Master Control Room 10, meanwhile, display is set in Master Control Room 10, To show the pressure value of the detection of the pressure sensor in each active sand filter plant.

Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations； Although the utility model is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that： It can still modify the technical solution described in previous embodiment, either to which part or all technical characteristic Carry out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from the utility model embodiment The scope of technical solution.

Claims (10)

1. a kind of active sand filter plant, it is characterised in that including active sand filter, controller, pressure sensor and list Trigger；

The activity sand filter includes sand extraction tube, and ceramic layer, the lower part of the sand extraction tube are set in the sand extraction tube tube wall It is connected with and carries sand pump, top is connected with sand-washing device；Splash-back is provided with the top of the sand-washing device, is washed described in the splash-back face The end face setting of sand device is at least one to detect the pressure sensor of sand aqueous mixtures pressure, and the pressure sensor can Pressure signal is delivered to the single board computer, the single board computer can handle the pressure signal and be delivered to controller, described Controller carries being turned on and off for sand pump described in can controlling.

2. active sand filter plant according to claim 1, it is characterised in that be provided with pressure threshold in the controller Value, after the pressure of pressure sensor detection is decreased to certain threshold value, the controller can output control signals to and carry sand pump, Control carries sand pump according to preset time repeatedly starting and stopping, to be cleaned to sand extraction tube.

3. active sand filter plant according to claim 1, it is characterised in that be provided with support on the outside of the sand extraction tube Pipe, is provided with multiple fixing pieces between the sand extraction tube and the support tube；The fixing piece can fix the sand extraction tube In the support tube.

4. active sand filter plant according to claim 3, it is characterised in that tank body is further included, and in the tank body It is provided with central tube and water distributor；

The water distributor is arranged at the lower part of the central tube and is interconnected；

The support tube penetrates in the central tube and the water distributor from top to bottom, between the support tube and the central tube It is provided with gap.

5. active sand filter plant according to claim 4, it is characterised in that be provided with the side wall of the tank body into water Branch pipe, and the water inlet pipe is connected with the central tube.

6. active sand filter plant according to claim 5, it is characterised in that further include liquid level gauge；The liquid level gauge can Dismantling connection is in active sand filter on the tube wall of water inlet pipe, and the liquid level gauge bottom is connected with the water inlet pipe It is logical；

Current can be entered in the liquid level gauge by the water inlet pipe, and show the water inlet branch by the liquid level gauge The height of intraluminal fluid position.

7. active sand filter plant according to claim 6, it is characterised in that set on the tube wall of the water inlet pipe logical Hole, the bottom of the liquid level gauge can be placed in the through hole.

8. active sand filter plant according to claim 7, it is characterised in that further include plug, the plug can seal Block up the through hole on the water inlet pipe.

9. according to claim 5-8 any one of them active sand filter plants, it is characterised in that half blind plate is further included, it is described Half blind plate is arranged at the water inlet end of the water inlet pipe, and is left into water and opened between the water inlet pipe and half blind plate Mouthful.

10. a kind of sewage filter system, it is characterised in that including Master Control Room and multiple claim 1-9 any one of them Active sand filter plant；

Controller in the active sand filter plant is integrated in the Master Control Room, meanwhile, display is set in the Master Control Room Device, to show the pressure value of the detection of the pressure sensor in each active sand filter plant.