Sediment-water interface substance migration and transformation simulation device and use method

Abstract

The invention relates to the technical field of environment, and particularly discloses a sediment-water interface substance migration and transformation simulation device and a use method. The device mainly comprises four parts: a columnar simulation container, a plurality of collection holes, an interface disturbance device, a heating device and an aeration device, the columnar simulation container is provided with a lightproof outer coating, the collection holes are uniformly distributed on the columnar simulation container except one collection hole is additionally arranged at the interface, and each collection hole can collect corresponding overlying water. The columnar simulation container is used for containing sediment and overlying water, the outer covering layer can simulate the dark environment of the sediment, and the multiple collection holes are used for obtaining an interface and a nearby overlying water sample in a layered mode. The device is reasonable in design and convenient to use, migration and transformation of the nutritive salt on the sediment-water interface under different environmental conditions can be accurately simulated, the migration and diffusion flux of the nutritive salt on the interface can be calculated, and the device has good application prospects in the technical field of the environment.

Description

technical field [0001] The invention belongs to the field of environmental technology, and in particular relates to a sediment-water interface material migration and transformation simulation device and a use method. Background technique [0002] Lakes and other natural conditions such as wind and biological disturbances, as well as artificial hydraulic disturbances such as ships passing by, are often disturbed. Shallow lakes are more disturbed. After wind disturbance or hydraulic disturbance, the sediments in the water body are suspended. Changes in environmental factors such as water often lead to easier release of endogenous pollutants in sediments, and will change the endogenous diffusion fluxes and release rates of nutrients such as nitrogen and phosphorus in sediments. [0003] The endogenous pollution of sediments is an important factor affecting lake water quality. The diffusion flux and release rate of endogenous pollution are important research topics in lake eutro...

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Problems solved by technology

The sediments collected by these two methods and simulated experiments can meet the diffusion flux and release rate of endogenous pollution when some water quality changes or environmental factors change, but for changes caused by wind disturbance or hydraulic disturbance, these methods cannot Achieved

Because this method cannot simulate the influence of wind disturbance or hydraulic disturbance on the endogenous diffusion flux and release rate of nutrients such as nitrogen and phosphorus

[0004] At present, the existing experimental devices and methods (201310342721.6) for studying the exchange flux of nutrients in sediment layers are mainly to study the diffusion flux of different layers of interstitial water under static conditions, and the release of endogenous nutrients in sediments will also be affected by The sediment resuspension process caused by various disturbance conditions; an existing experimental device and experimental method for simulating the migration and transformation behavior of pollutants in offshore seawater-sediment (201811152322.2), mainly uses a peristaltic pump to introduce water into the mud-water exchange container , simulating the flow of actual water bodies, and natural conditions not only involve the flow state, but also include different environmental conditions such as temperature, dissolved oxygen, and pH, which will affect the release of endogenous nutrients in sediments

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