CN107941305B - A kind of submerged artificial wetland water level detector and its detection method - Google Patents

Abstract

The invention discloses an undercurrent artificial wetland water level detector and a detection method thereof, wherein the detection method comprises the following steps: the detector comprises a detector inner core, a detector outer tube and a resistance indicator; the detector inner core includes: an electrode bar at the top end of the inner core and an electrode plate at the bottom end of the inner core; the electrode rod at the top end of the inner core is connected with the electrode plate at the bottom end of the inner core through an internal connecting wire; the top end of the detector outer tube is provided with an outer tube top end electrode plate, and the resistance indicator is respectively connected with an inner core top end electrode bar and an outer tube top end electrode plate; the detector inner core is provided with scales, and when a zero scale line on the detector inner core is level with the top end of the detector outer tube, the detector inner core and the bottom end of the detector outer tube are in the same horizontal plane. The invention has the beneficial effects that: the water level height can be rapidly read by adopting the arrangement of the inner core and the outer pipe, and the result is accurate and reliable; the stainless steel outer pipe can be driven into the substrate in the later stage of the construction of the subsurface flow constructed wetland, and any number of monitoring point positions can be set, so that the complexity of the construction of the wetland is greatly reduced.

Description

A kind of submerged artificial wetland water level detector and its detection method

technical field

The invention relates to the technical field of artificial wetland water level detection, in particular to an underflow artificial wetland water level detector and a detection method thereof.

Background technique

Subsurface flow constructed wetlands have the advantages of low investment and operating costs, convenient management, landscaping, and water ecological storage. At present, they have been widely used in the fields of deep purification of water quality such as tail water from urban sewage plants and polluted river water. etc. have outstanding technical advantages and broad application prospects. Water level is a key factor of hydrological mechanism. The level and change of water level directly affect the living environment of wetland plants and microorganisms, and then affect the operation effect of wetland system, which has an important impact on the function of subsurface flow constructed wetland system.

The growth and development of aquatic plants in the subsurface constructed wetland system needs to maintain a certain water level. Too high or too low water level is not conducive to the growth of plants. Unreasonable inflow flow and blockage of wetland matrix during wetland operation will cause short flow and surface overflow, which will reduce the purification capacity of the wetland system and bring health and safety risks. Wetland operation, management and maintenance need to adjust the water level reasonably according to heavy rain, drought, icing period, blockage, etc., to avoid excessively high or low water level, blocked water at the water inlet and submerged water outlet. Therefore, accurate measurement of water levels in subsurface wetlands at each stage is helpful to grasp the water flow conditions inside the system, provide a scientific basis for its operation and regulation, and provide technical support for related research on the impact of wetland water level changes.

Existing subsurface wetlands usually use water level observation pools or water level pipes to measure water level. The direct observation method has the disadvantages of low accuracy, high construction cost and few monitoring points. In addition to the direct observation method, the current liquid level measurement methods usually include the differential pressure method, float method, ultrasonic method, magnetic method, etc., but because the subsurface wetland is a shallow water body and the wetland bed is filled with fillers, these methods have low accuracy and disadvantages. Due to problems such as complex operation and poor applicability, it is not suitable for popularization and application in subsurface flow constructed wetland water level detection. In recent years, there is a method to judge the water level by the change of the resistance value of the sensitive device with the liquid level. Although the measurement accuracy is high, the control circuit is relatively complicated, which limits its application; the water level detection probe can use the conductivity of water to judge the level Water level, this method is simple and easy to implement, but a single probe can only judge whether the system water level has reached a certain fixed position, and this method cannot meet the accuracy requirements of subsurface flow wetland water level detection. As people pay more and more attention to the operation and management of the subsurface constructed wetland system, the accurate measurement of wetland water level becomes more and more meaningful, which will provide a strong technical guarantee for maintaining the ecological stability of the system and maintaining its sustainable operation. There is an urgent need to establish an accurate and simple method for measurement, and there has never been a report on the accurate measurement of the water level of subsurface flow constructed wetlands by using the electrical method.

Contents of the invention

The purpose of the present invention is to solve the above problems, and propose a subsurface constructed wetland water level detector and its detection method. The system and method have high precision and are easy to operate, and can be used for accurate measurement of the water level of shallow water bodies in constructed wetlands.

In order to achieve the above object, the present invention adopts the following technical solutions:

A submerged artificial wetland water level detector, comprising: a detector inner core, a detector outer tube and a resistance indicator;

The inner core of the detector includes: an electrode rod at the top of the inner core and an electrode sheet at the bottom end of the inner core; the electrode rod at the top of the inner core and the electrode sheet at the bottom end of the inner core are connected by an internal connecting wire;

The top of the outer tube of the detector is provided with an electrode sheet at the top of the outer tube, and the resistance indicator is respectively connected to the electrode rod at the top of the inner core and the electrode sheet at the top of the outer tube;

The inner core of the detector is provided with a scale, and when the zero scale line on the inner core of the detector is equal to the top of the outer tube of the detector, the inner core of the detector is at the same level as the bottom end of the outer tube of the detector.

Further, the inner core of the detector is prismatic.

Further, outer tube slits are evenly arranged on the outer tube of the detector, and the lowest end of the outer tube slit is not lower than the lowest end scale position of the inner core of the detector. .

Further, the outer surface of the outer tube of the detector is provided with a protrusion for preventing the blockage of the outer tube slit.

Further, the bottom end of the outer tube of the detector is in the shape of a B-type central drill bit.

Further, the top of the outer tube of the detector is symmetrically provided with openings.

A water level detection method of a subsurface constructed wetland water level detector, comprising:

Keep the outer tube of the detector in a vertical state and insert it into the subsurface artificial wetland water, and slowly insert the inner core into the outer tube;

When the value of the resistance indicator of the detector changes significantly or reaches the critical value of the alarm, at this time, the electrode sheet at the bottom of the inner core is just in contact with the water surface of the wetland, and the value of the scale line corresponding to the top of the outer tube of the detector is read, which is the measured position. water level.

A substrate clogging detection method for a subsurface constructed wetland water level detector, comprising:

Initially, vertically drive the outer tube of the detector to a depth similar to the depth of the subsurface constructed wetland substrate to be measured. After driving in, rotate the outer tube several times, and use the extrusion effect of the raised surface to prevent the filler from being stuck in the seam of the outer tube;

Constantly adjust the height of the outer tube of the detector, and use the inner core of the detector to measure the water level; until the initial water level measurement values of each monitoring point of the subsurface flow constructed wetland under normal operation are consistent;

Measure the water level of each monitoring point every set time;

When the water level in one area is significantly higher than the water level in other areas, it indicates that matrix blockage has occurred in this area.

A method for measuring the porosity of each layer of a subsurface constructed wetland using a subsurface constructed wetland water level detector, comprising:

Insert the outer tube of the detector into the subsurface flow artificial wetland system, adjust the inner core of the detector to the set height, and fix the position of the inner core;

Empty the water body in the subsurface flow constructed wetland system and re-add the water body until the resistance indicator of the detector is at the critical value of the warning light, and record the volume of the added water body; the porosity of the height layer can be obtained according to the obtained water body volume.

The beneficial effects of the present invention are:

The present invention chooses to use the resistance method to measure the water level of the submerged artificial wetland. There is a significant difference in the conductivity of the natural water body and the air, and then the water-air transfer position can be accurately determined; the inner core and the outer tube can be used to quickly read the water level. The mobile inner core greatly simplifies the complexity of the device and improves the accuracy of the results, and the measurement results are accurate and reliable; the stainless steel outer tube can be driven into the matrix in the late construction of the subsurface flow constructed wetland, and any number of monitoring points can be set. The complexity of wetland construction is greatly reduced; the alarm function of the resistance indicator realizes the convenient, accurate and rapid judgment of the position of the water level interface. This method provides an accurate water level detection method with simple operation and low cost.

Description of drawings

Fig. 1 is the schematic diagram of the inner core of detector of the present invention;

Fig. 2 is a schematic diagram of the outer tube of the detector of the present invention;

Fig. 3 is a schematic diagram of detecting the water level of an underflow constructed wetland according to the present invention.

Among them, 1 is the inner core of the detector, 2 is the electrode rod at the top of the inner core, 3 is the internal connecting wire, 4 is the electrode sheet at the bottom end of the inner core, 5 is the scale line, 6 is the outer tube of the detector, and 7 is the seam of the outer tube. 8 is the drill bit at the bottom of the outer tube, 9 is the surface protrusion, 10 is the opening at the top of the outer tube, 11 is the electrode sheet at the top of the outer tube, 12 is the resistance indicator of the detector, 13 is the alarm horn, 14 is the warning light, 15 is Alligator clip electrode wire, 16 is subsurface artificial wetland matrix, and 17 is wetland water surface.

Detailed ways:

Below in conjunction with accompanying drawing and example the present invention will be further described:

It is generally believed that natural water or sewage contains a certain concentration of ionic substances, and the water has good electrical conductivity, while the air has almost no electrical conductivity. Using this feature, the water level of subsurface flow constructed wetlands can be accurately measured. The invention discloses a submerged flow constructed wetland water level detector, which is mainly used for accurate detection of subsurface flow constructed wetland water level, as shown in Figure 1, comprising: a detector inner core 1, a detector outer tube 6 and a detector resistance indicator 12 An electrode is arranged on the top of the inner core 1 of the detector, and the outer tube 6 of the detector is another electrode, and the two electrodes are connected to a resistance indicator 12 for judging the water-air interface.

The inner core 1 of the detector includes the electrode rod 2 at the top of the inner core, the internal connecting wire 3, the electrode sheet 4 at the bottom end of the inner core and the scale line 5;

The main body of the detector core 1 is made of hard insulating plastic, such as polypropylene, polyphenylene sulfide rod, polyether ether ketone, etc., and the shape of the main body is prismatic; the bottom of the detector core is funnel-shaped, and the upper opening of the funnel is connected to The main body of the inner core; such a design can reduce the liquid residue on the inner core 1 of the detector, thereby increasing the accuracy of measurement.

As an embodiment, the main material of the inner core 1 of the detector is polypropylene, and the main body of the inner core is a triangular prism with a length of 600 mm. The side length of the equilateral triangle on the bottom surface of the table is reduced to 8mm, and the bottom 20mm to the bottom is a triangular prism.

The top of the inner core is equipped with a stainless steel electrode rod 2, the diameter of the electrode rod is 3-6mm, and the extension length is 15-30mm; the internal connecting wire 3 connects the top stainless steel electrode rod 2 and the bottom stainless steel electrode piece 4, and the wire is a waterproof single core wire , the circuit is completely wrapped by the insulating plastic main body; the stainless steel electrode piece 4 at the bottom of the inner core is a disc shape, with a diameter of 4-5mm and a thickness of 1-2mm, and the electrode piece is located in the center of the insulating plastic main body; there is a scale line 5 on the inner core, The measuring range is 500-1100mm, the minimum scale is mm, and when the zero scale line is equal to the top of the outer tube 6 of the detector, the inner core 1 of the detector is at the same level as the bottom of the outer tube 6 of the detector.

As an embodiment, the diameter of the electrode rod 2 at the top of the inner core is 3mm, and the extension length is 15mm; the internal connecting wire 4 is completely wrapped by a hard insulating plastic body; the diameter of the electrode sheet 4 at the bottom of the inner core is 4mm, and the thickness is 1mm; The measuring range of scale line 5 is 500mm.

As shown in Figure 2, the outer tube 6 of the detector includes an outer tube slit 7, a drill bit 8 at the bottom of the outer tube, a surface protrusion 9, an opening 10 at the top of the outer tube, and an electrode sheet 11 at the top of the outer tube; the material of the outer tube 6 of the detector is Stainless steel, round tube, length 500-1100mm, outer diameter 40mm, inner diameter 30mm;

The outer tube 6 of the detector is equipped with an outer tube slit 7, the outer tube slit 7 is 100mm long and 4mm wide, the angle between the slit and the slit on the cut surface of the outer tube is 90°, the vertical overlapping length is 20mm, and the outer tube slit 7 is evenly distributed , the lowest end of the outer pipe seam is not lower than the lowest end scale position of the inner core of the detector.

The drill bit 8 at the bottom of the outer pipe is a B-type central drill bit to facilitate the smooth insertion of the outer pipe into the wetland matrix. To prevent seam clogging, cuboid shape, length 500-1000mm, bottom surface is square, side length is 5mm;

The top of the outer tube has an opening 10 for the extraction of the outer tube. The opening is 40mm away from the top, and the diameter is 15mm. , the overhang length is 10-20mm, the height is 20-40mm, and the thickness is 3-6mm.

As shown in Figure 3, the detector resistance indicator 12 includes a warning horn 13 and a warning light 14; the detector resistance indicator 12 has a range of 200KΩ, a minimum resolution of 100Ω, and an internal supply voltage of 6V; the impedance measurement chip is used to monitor the resistance value , send the data to the single-chip microcomputer, and realize the alarm within a certain resistance range through a simple judgment program, the user-defined alarm range is 0-2KΩ, and two alarm modes, alarm horn and alarm light, can be selected; when measuring, the electrode line of the crocodile clip is positive Connect the electrode sheet at the top of the outer tube, and connect the negative pole to the electrode rod at the top of the inner core.

The detection method of the invented submerged artificial wetland water level detector is as follows: keep the outer tube in a vertical state and insert it into the water, slowly insert the inner core into the outer tube until its position is at the critical value of the resistance indicator value of the detector for significant changes or alarms, at this time The electrode piece at the bottom of the inner core is just in contact with the water surface of the wetland, and the value of the scale line corresponding to the top of the outer tube of the detector is read, which is the water level at the measured position.

Example 1:

Subsurface flow constructed wetland water level changes in each stage to judge substrate blockage.

Taking a small subsurface flow constructed wetland as the research object, the wetland inflow is the sewage treatment plant outlet water, initially the outer tube 6 of the detector is driven vertically to a depth similar to that of the subsurface flow constructed wetland matrix 16, and the outer tube is rotated several times after penetration, Use the extruding effect of the surface protrusion 9 to prevent the filler from being stuck in the outer pipe slit 7, continuously use the inner core 1 of the detector to measure the water level, and use an external lever to pass through the opening 10 at the top of the outer pipe to adjust the height of the outer pipe 6 of the detector. Until the initial water level measurement value of each monitoring point in the subsurface flow constructed wetland remains consistent under normal operation, keep the system water flow constant, and measure the water level at each point every six months.

The results show that when the bottom end of the inner core 1 of the detector comes into contact with the water surface 17 of the subsurface artificial wetland, the value of the resistance indicator 12 of the detector decreases significantly, from an over-range to a value of the order of a thousand ohms, and an alarm light turns on, and the water level measurement accuracy is 1mm. With the operation of the system, the water level at the inlet end of the subsurface flow constructed wetland gradually increased. After two years of operation, the water level at the inlet end increased from 430mm at the initial stage to 486mm. of clogging.

Example 2:

Determination of porosity in each layer of subsurface flow constructed wetland.

The parameters of the detector are as shown above. The laboratory-scale subsurface flow artificial wetland is taken as the research object. The subsurface flow wetland is 1500mm long, 300mm wide, and 350mm high. Insert the outer tube 6 of the detector into the system, adjust the height of the inner core 1 of the detector to 110 mm and fix the position of the inner core, drain the water body in the wetland system and slowly add a certain volume of tap water until the resistance indicator 12 of the detector is at the warning light and lights up The critical value, record the volume of water added, adjust the inner core 1 of the detector to 220mm and 330mm in turn, and repeat the above operation.

The results show that the porosity of the upper, middle and lower layers of the subsurface flow constructed wetland system in the early stage of plant growth is 42.4%, 44.0% and 42.6%, respectively, and after 6 months of growth, the porosity is divided into 38.0%, 43.4% and 42.4% %, indicating that plant root growth occupies about 10% of the void volume.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (1)

1. A matrix clogging detection method that adopts an underflow constructed wetland water level detector, is characterized in that, The submerged artificial wetland water level detector includes: the inner core of the detector, the outer tube of the detector and the resistance indicator; the inner core of the detector includes: the electrode rod at the top of the inner core and the electrode sheet at the bottom of the inner core; The electrode rod at the top of the core and the electrode at the bottom of the inner core are connected by an internal connecting wire; the top of the outer tube of the detector is provided with an electrode at the top of the outer tube, and the resistance indicator is respectively connected to the electrode at the top of the inner core and the top electrode of the outer tube There is a scale on the inner core of the detector, and when the zero scale line on the inner core of the detector is equal to the top end of the outer tube of the detector, the inner core of the detector is at the same level as the bottom end of the outer tube of the detector; Outer pipe seams are uniformly arranged on the outer pipe, and the lowest end of the outer pipe seam is not lower than the lowest end scale position of the inner core of the detector; rise; The method for detection of matrix blockage comprises: Initially, the outer tube of the detector is driven vertically to a depth similar to the depth of the subsurface constructed wetland matrix to be tested. After driving in, the outer tube is rotated several times, and the extrusion effect of the protrusions on the outer surface of the detector outer tube is used to prevent the outer tube from cracking. Insert the packing inside; Constantly adjust the height of the outer tube of the detector, and use the inner core of the detector to measure the water level height; until the initial water level measurement value of each monitoring point of the subsurface flow constructed wetland under normal operation is consistent; Measure the water level of each monitoring point every set time; When the water level in one area is significantly higher than the water level in other areas, it indicates that matrix blockage has occurred in this area.