CN111766181B - In-situ aquatic ecological nutrient salt sediment-overlying water interface migration and transformation simulation system - Google Patents
In-situ aquatic ecological nutrient salt sediment-overlying water interface migration and transformation simulation system Download PDFInfo
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- CN111766181B CN111766181B CN202010623507.8A CN202010623507A CN111766181B CN 111766181 B CN111766181 B CN 111766181B CN 202010623507 A CN202010623507 A CN 202010623507A CN 111766181 B CN111766181 B CN 111766181B
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Abstract
The invention relates to an in-situ water ecological nutrient salt sediment-overlying water interface migration and transformation simulation system, which is characterized by comprising the following steps: the system comprises a circulating water system, a simulated water ecological experimental system, an aeration system, a monitoring system and a sampling system, wherein the simulated water ecological experimental system lays sediment; the circulating water system flows through the overlying water, enters the water inlet chamber from the water inlet, and enters the simulated water ecological experiment system through the steady flow hole; the aeration system provides dissolved oxygen for upward water covering through a porous blast aeration pipe; the monitoring system monitors the real-time water quality of the simulated culture process; the method can be used for researching endogenous release of the nutrient salt in the water ecological system under different environmental conditions, accurately quantifying migration and transformation rules of the nutrient salt at a sediment-overlying water interface, and providing theoretical basis and technical reference for repairing the water ecological system.
Description
Technical Field
The invention relates to the technical field of water ecological system engineering, in particular to an in-situ water ecological nutrient salt sediment-overlying water interface migration and transformation simulation system.
Background
Along with the rapid development of the economy in China, the water pollution problem is increasingly prominent, although the country is out of the table a series of laws and regulations about water pollution control, the external pollution control force on the water environment is gradually increased, so that the external pollution is effectively intercepted, and under certain conditions, sediment can be used as the endogenous pollution to continuously cover water upwards to release pollutants, so that the overlying water maintains a higher nutrition level.
The Chinese patent publication No. CN105585129A discloses a device and a method for simulating the nitrogen trend of an in-situ river ecological system, the device can monitor the temperature, the pH and the dissolved oxygen in the simulation process in real time, simultaneously measure the concentration of sediment nitrogen, the concentration of water nitrogen and the content of produced gas nitrogen, and study the output and conversion of nitrogen among various denitrification paths of the river ecological system; the Chinese patent publication No. CN110082484A discloses a water-sediment degradation experimental device, which consists of an air supply device, a sealing device and an exhaust sampling device, and is used for ensuring anaerobic experimental conditions and performing experiments of water-sediment degradation experiments, laboratory simulation of endogenous pollutant release and the like; CN110578318A provides a circulating water tank capable of simulating the sediment environment of river, etc., and detecting the sediment state at different time points through a plurality of incubators, and realizing the regulation of water depth and flow rate through a circulating water system; chinese patent publication No. CN108872528A discloses a "continuous process-based sediment nitrogen circulation rate determination method", in which sediment is added into a serum bottle to replace air at the top of the bottle, urea is added, and the mixture is cultured at constant temperature, so that the denitrification, nitrification and ammoniation rates of the sediment can be calculated; the Chinese patent publication No. CN110528454A discloses a simulation experiment device and a simulation experiment method for adsorbing and releasing pollutants by sediments at the junction of a river channel, wherein the device comprises a water flow circulating device, a flow regulating device, a sediment laying device and a sampling device, can change the junction angle through a hinge, and is suitable for the river channels with different junction ratios under natural conditions; the Chinese patent publication No. CN110967279A discloses an experimental device, an experimental method and application thereof for simulating the migration and conversion behavior of pollutants in near-sea water-sediment, wherein the device comprises an exogenous pollutant storage chamber, a water source conveying system and a mud-water exchange system so as to realize the simulation of pollutant input, stay and sample sampling; the Chinese patent publication No. CN109490084A discloses an in-situ test device and method for simulating the release amount of endogenous pollutants in marine sediments under the action of waves, which can be used for in-situ experiments of the marine sediments, maintains the original structure of the sediments in the sampling process, simulates the loading conditions under different natural conditions, and reveals the endogenous release rule of the marine sediments; chinese patent publication No. CN107449638A discloses a "device for studying sediment-water interface nutrient salt flux under the influence of oxygen", the experimental vessel is composed of upper and lower separable parts, the upper part is provided with an aerobic/anaerobic control device and an overlying water collector, the lower part is provided with a gap water collection hole, and the comparative study of sediment-water interface nutrient salt flux under the condition of sufficient oxygen and lack of oxygen can be achieved; chinese patent publication No. CN104360014a discloses a "device for simulating the influence of water level change on the release risk of nitrogen, phosphorus and heavy metals from sediments", in which a plurality of steps are arranged in the device, the heights of the steps are arranged in a gradient manner, and a sediment containing groove is arranged, so that the elevation gradient and the water level change of the sediments can be effectively simulated; chinese patent publication No. CN104075872a discloses a "circulation straight water tank device for simulating sediment re-suspension under the action of reciprocating flow", which can simulate the starting and re-suspension process of sediment under the action of tidal reciprocating flow of tidal river reach, and can collect water samples at different depths under certain hydraulic conditions.
Nutrient salts in the sediment can be released into the overlying water body through processes of desorption, microbial decomposition, oxidation reduction, molecular diffusion, re-suspension and the like, and meanwhile, the nutrient salts in the overlying water can migrate to the sediment through processes of adsorption, precipitation/sedimentation, molecular diffusion and the like. When the overlying water body is anoxic, fe 3+ Is reduced to Fe 2+ With Fe 3+ The combined phosphorus is released into the overlying water, and at the same time, the dissolution of calcium-combined phosphorus and the decomposition of organic matters also release phosphorus into the overlying water, thereby increasing the phosphorus content in the water body. The migration and conversion of nitrogen are more complex than that of phosphorus, and the processes of decomposition, nitrification/denitrification, ammoxidation and the like of nitrogen-containing organic matters have important influence on the distribution and the existence form of nitrogen among sediment-overlying water. The nitrification and denitrification at the sediment-overburden interface are vertically stratified and occur only within a sediment thin layer of a few centimeters in the surface layer. Under the aerobic condition, organic nitrogen in the sediment is mineralized to generate NH 4 + 、NO 3 - The inorganic ions are diffused into the overlying water body, so that the nitrogen content in the water body is improved; NO in overlying water 3 - Enters the anaerobic layer of the sediment and is reduced to N by denitrifying bacteria 2 O and N 2 And eventually spills into the air. Under different environmental conditions, migration and conversion of nutrient salts among overlying water, sediments and sediment interstitial water are researched, a substance exchange mechanism between the sediments and the overlying water is analyzed, theoretical support is provided for water ecological system restoration, and technical guidance is provided for solving the water environment problem and realizing sustainable development of environment, economy and society on the basis.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides an in-situ water ecological nutrient salt sediment-overlying water interface migration and transformation simulation system which can accurately quantify the migration and transformation rule of nutrient salt at the sediment-overlying water interface of a water ecological system, simulate the sediment paving and sediment sampling ports and sediment gap water sampling ports of a water ecological experimental system, fill overlying water body at the upper part and set the overlying water sampling ports; the circulating water system pushes the overlying water to flow through the water pump, enters the water inlet chamber through the water inlet and enters the simulated river channel through the steady flow holes formed in the steady flow plate; the aeration system provides dissolved oxygen for upward water covering through an air pipe and a porous blasting aeration pipe; the monitoring system monitors the real-time water quality of the simulated culture process.
The technical scheme adopted for realizing the purpose of the invention is as follows: an in situ water ecological nutrient salt deposit-overlying water interface migration transformation simulation system, comprising: circulating water system, simulation water ecological experiment system, aeration system, monitoring system and sampling system, circulating water system include: the water pump 11 is connected with the water inlet 14 and the water outlet 17 through the water pipe 12 respectively to form a closed loop, the water pipe between the water pump 11 and the water inlet 14 is provided with the flow meter 13, and the water pipe between the water pump 11 and the water outlet 17 is provided with the valve 18; the simulated water ecology experiment system comprises: the device comprises a steady flow hole 21, a first steady flow plate 22, a second steady flow plate 23, an overlying water body 7 and sediment 8, wherein the first steady flow plate 22 and the second steady flow plate 23 divide a glass water tank 19 into a water inlet chamber 15, a water ecological laboratory 24 and a water outlet chamber 16 in sequence, the sediment 8 is arranged at the bottom of the water ecological laboratory 24, the overlying water body 7 is arranged at the upper part of the sediment 8, a sediment-overlying water interface is formed between the sediment 8 and the overlying water body 7, and the steady flow holes 22 are respectively arranged on the first steady flow plate 21 and the second steady flow plate 23; the sampling system comprises: a water sample sampling port 31, a sediment sampling port 32 and a sediment gap water sampling port 33, wherein the water sample sampling port 31 is arranged in the overlying water body 7 above the sediment-overlying water interface, and the sediment sampling port 32 and the sediment gap water sampling port 33 are arranged in the sediment 8 below the sediment-overlying water interface; the monitoring system includes: the flow meter probe 41, the flow meter host 42, the ORP probe 43, the DO probe 44, the pH probe 45, the computer host 46 and the display 47 are arranged in the overlying water body 7 above the sediment-overlying water interface, the flow meter probe 41, the ORP probe 43, the DO probe 44 and the pH probe 45 are electrically connected with the computer host 46, the computer host 46 is electrically connected with the display 47, and the flow meter probe 41 is electrically connected with the flow meter host 42; the aeration system includes: the device comprises a porous air blast aeration pipe 51, an air pipe 52, an air flowmeter 53 and an air source 54, wherein the porous air blast aeration pipe 51 is connected with the air source 54 through the air pipe 52, the air flowmeter 53 is arranged on the air pipe 52 between the porous air blast aeration pipe 51 and the air source 54, the porous air blast aeration pipe 51 is arranged in the overlying water body 7 above the sediment-overlying water interface, and the aeration amount of overlying water in a simulated water ecological system is controlled by adjusting the air flowmeter 53.
The water replenishing system comprises a water replenishing port 61, a water replenishing valve 62, a water replenishing flow meter 63, a water replenishing pump 64 and a water storage tank 65, wherein the water replenishing port 61 is arranged on the upper portion of the water inlet 14, the water replenishing pump 64 is arranged on a water pipe connected with the water replenishing port 61 of the water storage tank 65, the water replenishing flow meter 63 is arranged on a water pipe between the water replenishing pump 64 and the water replenishing port 61, the water replenishing valve 62 is arranged on a water pipe between the water replenishing flow meter 63 and the water replenishing port 61, and the water replenishing amount is controlled by adjusting the opening degree of the water replenishing valve 62.
The glass water tank 19 is an organic glass water tank.
The steady flow holes 22 are arranged in a matrix, and the aperture is gradually increased from bottom to top, so that the overlying water body is in different flow state distributions.
The simulated water ecology experiment system also comprises a fixed transverse frame 25, wherein two ends of the fixed transverse frame 25 are fixedly connected with the glass water tank 19, the fixed transverse frame 25 is respectively fixedly connected with the flow meter probe 41, the ORP probe 43, the DO probe 44, the pH probe 45 and the porous blast aeration pipe 51, the vertical height of the fixed transverse frame 25 is adjustable, and the positions of the monitoring device and the porous blast aeration pipe 51 fixed on the fixed transverse frame are adjusted.
One or more water sampling ports 31 are arranged, one or more sediment gap water sampling ports 33 are arranged, and a special gap water sampler is required to be externally connected.
The air source 54 is an air compressor, an oxygen tank or a nitrogen tank.
The water storage tank 65 is filled with tap water, reclaimed water or treated effluent of a sewage plant.
The water storage tank 65 is filled with tap water, reclaimed water or treated effluent from a sewage plant to form mixed water.
The in-situ water ecological nutrient salt sediment-overlying water interface migration and transformation simulation system has the beneficial effects that:
1. the method can be used for researching migration and conversion of the nutrient salts in the water ecosystem in multiple phases under different environmental conditions, accurately quantifying migration and conversion rules of the nutrient salts at sediment-overlying water interfaces of the water ecosystem, and providing theoretical basis and technical reference for researching ecological restoration of the water ecosystem; the device has the advantages of simple structure, convenient operation, strong function, excellent performance and strong adaptability;
2. the sampling system realizes synchronous collection of overlying water, sediment interstitial water and sediment samples through sampling port site arrangement;
3. different overlying water flow field distribution can be realized by adjusting the flow of the water pump and the arrangement of the steady flow holes;
4. different oxidation-reduction conditions of the overlying water can be realized by controlling the conditions.
Drawings
FIG. 1 is a schematic diagram of an in situ aquatic ecological nutrient salt deposit-overlying water interface migration and conversion simulation system;
FIG. 2 is a schematic illustration of the arrangement of sampling points in FIG. 1;
FIG. 3 is a layout of the flow stabilizing holes in the flow stabilizing plate of FIG. 1;
FIG. 4 is an overlay water nitrogen content variation in an example embodiment;
FIG. 5 is a plot of variation in sediment nitrogen loading in an example implementation;
in the figure: 7. the system comprises an overlying water body 8, sediment 11, a water pump 12, a water pipe 13, a flowmeter 14, a water inlet 15, a water inlet chamber 16, a water outlet chamber 17, a water outlet 18, a valve 19, a glass water tank 21, a steady flow hole 22, a first steady flow plate 23, a second steady flow plate 24, a water ecology laboratory 25, a fixed cross frame 31, a water sample port 32, a sediment sample port 33, a sediment gap water sample port 41, a flow meter probe 42, a flow meter host, a 43 ORP probe, a 44 DO probe, a 45 pH probe 46, a computer host 47, a display 51, a porous blast aeration pipe 52, an air pipe 53, a gas flowmeter 54, an air source 61, a water supplementing port 62, a water supplementing valve 63, a water supplementing flowmeter 64, and a water supplementing pump 65.
Detailed Description
The present invention is described in further detail below with reference to the drawings and the specific embodiments, which are described herein for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Examples:
sediment and an overlying water sample used in the indoor simulation experiment are sediment and a water sample collected by an in-situ river channel, the sample is stored in a dark place at a low temperature after being collected, is returned to a laboratory as soon as possible, and is filled in a simulated water ecological system device, so that the construction of the whole laboratory simulation environment is completed.
As shown in fig. 1, the in-situ water ecological nutrient salt sediment-overlying water interface migration and transformation simulation system is characterized in that the system comprises: circulating water system, simulation water ecological experiment system, aeration system, monitoring system and sampling system, circulating water system include: the water pump 11 is connected with the water inlet 14 and the water outlet 17 through the water pipe 12 respectively to form a closed loop, the water pipe between the water pump 11 and the water inlet 14 is provided with the flow meter 13, and the water pipe between the water pump 11 and the water outlet 17 is provided with the valve 18; the simulated water ecology experiment system comprises: the device comprises a steady flow hole 21, a first steady flow plate 22, a second steady flow plate 23, an overlying water body 7 and sediment 8, wherein the first steady flow plate 22 and the second steady flow plate 23 divide a glass water tank 19 into a water inlet chamber 15, a water ecological laboratory 24 and a water outlet chamber 16 in sequence, the sediment 8 is arranged at the bottom of the ecological laboratory 24, the overlying water body 7 is arranged at the upper part of the sediment 8, a sediment-overlying water interface is formed between the sediment 8 and the overlying water body 7, and the steady flow holes 22 are respectively arranged on the first steady flow plate 21 and the second steady flow plate 23; the sampling system comprises: a water sample sampling port 31, a sediment sampling port 32 and a sediment gap water sampling port 33, wherein the water sample sampling port 31 is arranged in the overlying water body 7 above the sediment-overlying water interface, and the sediment sampling port 32 and the sediment gap water sampling port 33 are arranged in the sediment 8 below the sediment-overlying water interface; the monitoring system includes: a flow meter probe 41, a flow meter host 42, an ORP probe 43, a DO probe 44, a pH probe 45, a computer host 46 and a display 47, wherein the flow meter probe 41, the ORP probe 43, the DO probe 44 and the pH probe 45 are arranged in the overlying water body 7 above the sediment-overlying water interface, the ORP probe 43, the DO probe 44 and the pH probe 45 are electrically connected with the computer host 46, the computer host 46 is electrically connected with the display 47, and the flow meter probe 41 is electrically connected with the flow meter host 42; the aeration system includes: the device comprises a porous air blast aeration pipe 51, an air pipe 52, an air flowmeter 53 and an air source 54, wherein the porous air blast aeration pipe 51 is connected with the air source 54 through the air pipe 52, the air flowmeter 53 is arranged on the air pipe 52 between the porous air blast aeration pipe 51 and the air source 54, the porous air blast aeration pipe 51 is arranged in the overlying water body 7 above the sediment-overlying water interface, and the aeration amount of overlying water in a simulated water ecological system is controlled by adjusting the air flowmeter 53.
The aeration system comprises a porous blast aeration pipe 51, an air pipe 52, an air flowmeter 53 and an air source 54, wherein the aeration amount of overlying water in the simulated water ecological system is controlled by adjusting the air flowmeter 53, the air source 54 can be replaced according to actual requirements, if the experiment is an aerobic condition, the dissolved oxygen content in the overlying water is increased, the air source 54 is an air compressor or an oxygen tank, and if the experiment is an anaerobic condition, the air source 54 is a nitrogen tank.
The water replenishing system comprises a water replenishing port 61, a water replenishing valve 62, a water replenishing flow meter 63, a water replenishing pump 64 and a water storage tank 65, wherein the water replenishing amount is controlled by adjusting the opening degree of the water replenishing valve 62, so that the water level of the overlying water in the simulated water ecological system is kept constant, and the water storage tank 65 can be tap water, reclaimed water, treated water of a sewage plant and the like.
As shown in fig. 2, the sampling system includes one or more water sample sampling ports 31 above the sediment-overburden water interface, a sediment sampling port 32 below the interface, and one or more sediment gap water sampling ports 33 that require an external specialized gap water sampler.
The simulated water ecology experiment system comprises a steady flow hole 21, a first steady flow plate 22, a second steady flow plate 23 and a fixed transverse frame 25, wherein the injected overlying water body 7 and sediment 8 paved at the bottom are transparent cuboid composed of organic glass, the length of the part is 1.2 m, the width of the part is 0.45 m, and the height of the part is 0.7 m, wherein the distances between a water inlet and a water outlet are 0.1m, the first steady flow plate 22 and the second steady flow plate 23 can uniformly distribute the water flow speed in the overlying water body, prevent jet flow phenomenon, simultaneously can block sediment from running off along with water outlet, and can enable the overlying water body to be in different flow state distribution by controlling the aperture size and the distribution position of the steady flow hole 21, the steady flow hole is arranged as shown in fig. 3, the vertical height of the fixed transverse frame 25 is adjustable, the aim of reinforcing an experiment device can be achieved, and the positions of a monitoring device and an aerator pipe fixed on the steady flow hole can be adjusted.
The specific experimental steps are as follows:
1. filling impurities such as leaves and the like in riverway sediment removed from the original position into an experimental device, wherein the sediment filling height is 10cm, slowly injecting overlying water along the inner wall of the device by adopting a siphon method, and the overlying water height is 50cm; closing valve 18 and refill valve 62 during filling;
2. a water sample sampling port 31 is formed at the position of 5cm, 25cm and 45cm of the upper water layer 7, a sediment sampling port 32 is formed at the position of 5cm below a sediment-upper water layer interface, sediment gap water sampling ports 33 are formed at the positions of 0.5cm, 1cm, 1.5cm, 2cm and 2.5cm below the sediment-upper water layer interface, the sampling ports are externally connected with a Rhizon gap water sampler, and the arrangement positions of the sampling ports are shown in figure 2;
3. starting the water pump 11, regulating the valve 18, and maintaining the circulation period of the overlying water for 24 hours, wherein the circulation flow is 0.2l/min;
4. the air source 54 selects an air compressor, upward water covering aeration is carried out, the upward water covering is maintained in an aerobic state, and the dissolved oxygen in the water body is 6.0-7.0mg/l;
5. the regenerated water is selected as a water supplementing source, a water storage tank 65 stores the regenerated water, a water supplementing pump 64 is started, a water supplementing valve 62 is adjusted, the water level of the overlying water in the simulated water ecological system is maintained to be constant, and the water supplementing amount is 3ml/min according to the evaporation amount calculation in the area.
6. The experiment was maintained for 20 days of operation and the overburden and sediment gap water samples were taken on days 0, 1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 of the start of the experiment, and sediment samples were taken at the beginning and end of the experiment while monitoring the flow rate, DO, ORP and pH in the overburden daily. The results show that as shown in fig. 4, the ammonia nitrogen content in the overlying water is greatly reduced, the total phosphorus and the active phosphorus are also reduced to a certain extent, the risk of releasing sediment into the overlying water exists, the phosphorus tends to migrate towards the sediment, and the phosphorus is stored in the sediment in the form of apatite phosphorus, and as shown in fig. 5, the migration of pollutants between interfaces is mainly based on turbulent diffusion.
The foregoing is merely a preferred embodiment of the invention, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the invention, which are intended to be comprehended within the scope of the invention.
Claims (9)
1. An in situ aquatic ecology nutrient salt deposit-overlying water interface migration and conversion simulation system, comprising: circulating water system, simulation water ecological experiment system, aeration system, monitoring system and sampling system, circulating water system include: the water pump (11) is connected with the water inlet (14) and the water outlet (17) through the water pipe (12) respectively to form a closed loop, the flowmeter (13) is arranged on a water pipe between the water pump (11) and the water inlet (14), and the valve (18) is arranged on a water pipe between the water pump (11) and the water outlet (17); the simulated water ecology experiment system comprises: the device comprises a steady flow hole (21), a first steady flow plate (22), a second steady flow plate (23), an overlying water body (7) and sediments (8), wherein the first steady flow plate (22) and the second steady flow plate (23) divide a glass water tank (19) into a water inlet chamber (15), a water ecological laboratory (24) and a water outlet chamber (16) in sequence, sediments (8) are arranged at the bottom of the water ecological laboratory (24), an overlying water body (7) is arranged at the upper part of the sediments (8), a sediment-overlying water interface is formed between the sediments (8) and the overlying water body (7), and steady flow holes (21) are respectively arranged on the first steady flow plate (22) and the second steady flow plate (23); the sampling system comprises: a water sample sampling port (31), a sediment sampling port (32) and a sediment gap water sampling port (33), wherein the water sample sampling port (31) is arranged in an overlying water body (7) above the sediment-overlying water interface, and the sediment sampling port (32) and the sediment gap water sampling port (33) are arranged in a sediment (8) below the sediment-overlying water interface; the monitoring system includes: the system comprises a flow meter probe (41), a flow meter host (42), an ORP probe (43), a DO probe (44), a pH probe (45), a computer host (46) and a display (47), wherein the flow meter probe (41), the ORP probe (43), the DO probe (44) and the pH probe (45) are arranged in an overlying water body (7) above a sediment-overlying water interface, the ORP probe (43), the DO probe (45) and the pH probe (45) are electrically connected with the computer host (46), the computer host (46) is electrically connected with the display (47), and the flow meter probe (41) is electrically connected with the flow meter host (42); the aeration system includes: the device comprises a porous blasting aeration pipe (51), an air pipe (52), a gas flowmeter (53) and an air source (54), wherein the porous blasting aeration pipe (51) is connected with the air source (54) through the air pipe (52), the gas flowmeter (53) is arranged on the air pipe (52) between the porous blasting aeration pipe (51) and the air source (54), the porous blasting aeration pipe (51) is arranged in an overlying water body (7) above a sediment-overlying water interface, and the aeration quantity of overlying water in a simulated water ecological system is controlled by adjusting the gas flowmeter (53).
2. The in-situ water ecological nutrient salt deposit-overlying water interface migration and conversion simulation system according to claim 1, further comprising a water supplementing system, wherein the water supplementing system comprises a water supplementing port (61), a water supplementing valve (62), a water supplementing flow meter (63), a water supplementing pump (64) and a water storage tank (65), the water supplementing port (61) is arranged on the upper portion of the water inlet (14), the water supplementing pump (64) is arranged on a water pipe connected with the water supplementing port (61) of the water storage tank (65), the water supplementing flow meter (63) is arranged on a water pipe between the water supplementing pump (64) and the water supplementing port (61), the water supplementing valve (62) is arranged on a water pipe between the water supplementing flow meter (63) and the water supplementing port (61), and the water supplementing amount is controlled by adjusting the opening degree of the water supplementing valve (62).
3. The in situ water ecological nutrient salt deposit-overlying water interface migration and transformation simulation system according to claim 1, wherein the glass water tank (19) is a plexiglass water tank.
4. The in-situ water ecological nutrient salt deposit-overlying water interface migration and conversion simulation system according to claim 1 or claim 2, wherein the steady flow holes (21) are arranged in a matrix, and the pore diameters are gradually increased from bottom to top, so that the overlying water body is in different flow state distributions.
5. The in-situ water ecology nutrient salt deposit-overlying water interface migration conversion simulation system according to claim 1 or claim 2, further comprising a fixed transverse frame (25), wherein two ends of the fixed transverse frame (25) are fixedly connected with a glass water tank (19), the fixed transverse frame (25) is fixedly connected with a fluviograph probe (41), an ORP probe (43), a DO probe (44), a pH probe (45) and a porous blast aerator pipe (51) respectively, and the vertical height of the fixed transverse frame (25) is adjustable to adjust the positions of a monitoring device and the porous blast aerator pipe (51) fixed on the fixed transverse frame.
6. The in-situ water ecological nutrient salt sediment-overlying water interface migration and conversion simulation system according to claim 1, wherein one or more water sample sampling ports (31) are arranged, one or more sediment gap water sampling ports (33) are arranged, and a special gap water sampler is required to be externally connected.
7. The in situ water ecological nutrient salt deposit-overlying water interface migration and conversion simulation system of claim 1, wherein the air source (54) is an air compressor, an oxygen tank, or a nitrogen tank.
8. The in-situ water ecological nutrient salt deposit-overlying water interface migration and conversion simulation system according to claim 2, wherein the water storage tank (65) is filled with tap water, reclaimed water or treated effluent of a sewage plant.
9. The in-situ water ecological nutrient salt deposit-overlying water interface migration and conversion simulation system according to claim 2, wherein the water storage tank (65) is filled with tap water, reclaimed water or effluent water after treatment of a sewage plant to form mixed water.
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| CN112520865B (en) * | 2020-11-18 | 2022-11-25 | 中国市政工程华北设计研究总院有限公司 | Method and device for measuring release amount of water body litter pollutants |
| CN113406027B (en) * | 2021-06-16 | 2022-06-14 | 南京工业大学 | Quantitative calculation method for phosphorus migration and conversion in pipeline sediment-water system |
| CN113588209A (en) * | 2021-07-30 | 2021-11-02 | 交通运输部天津水运工程科学研究所 | Experimental device and method for phosphorus flux water tank in river |
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