DGT Passive Sampling Device Anchoring and Layer Replacement
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Solution Overview
Problem
Existing DGT sampling devices are unable to eliminate the influence of water flow and microorganisms on the sampling device, leading to instability and biofilm formation, and they cannot replace the adsorption layer in time when sampling at different heights, affecting analysis results.
Innovation Solution
A DGT passive sampling device with a bottom fixed unit, a passive sampling unit featuring ring plates and filtering surfaces with a diffusion layer and adsorption part, and a floating marking unit, which includes a winding cylinder and counterweight sealing plate to stabilize the device and facilitate sampling at different heights while preventing biofilm formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DGT sampling device is placed in water body without anchoring mechanism, then the device structure is simple, but the device stability is poor and easily affected by water flow
Solution Approach 1:
The device is divided into multiple functional modules: bottom fixed unit with drill bit for anchoring, passive sampling unit with filtering surfaces and adsorption layers, and floating marking unit with buoyancy elements. This segmentation allows each module to perform its specific function independently while maintaining overall device stability without excessive complexity.
Solution Approach 2:
The device converts the harmful effect of water flow into a beneficial feature by using water current to drive the rotation of the adsorption drum through the transmission mechanism. This automatic rotation enables continuous sampling and prevents biofilm accumulation, turning the previously harmful water flow into a useful driving force for the sampling process.
2Measurement precision
If the adsorption layer is not replaced timely when sampling at different heights, then the device structure is simple, but the analysis results are affected due to cross-contamination
Solution Approach 1:
The adsorption layer is designed as a dynamic, replaceable component mounted on a rotating drum. The adsorption drum can rotate to bring different adsorption layers into the sampling position, and the replacement mechanism allows timely substitution of saturated layers. This dynamic design ensures sampling accuracy across different heights and time periods without requiring a completely complex replacement system.
Solution Approach 2:
The device implements a system where used adsorption layers are discarded and fresh layers are continuously supplied. The adsorption drum stores multiple adsorption layers, and when one layer becomes saturated, the system automatically or manually advances to the next layer, ensuring that sampling at different heights and times does not result in cross-contamination while maintaining operational simplicity.
3Reliability
If the device does not have biofilm prevention mechanism, then the device structure is simple, but microorganisms attach to form biofilm affecting sampling quality
Solution Approach 1:
The device converts the harmful effect of water flow and microorganisms into a beneficial feature by using water current to drive the rotation of the adsorption drum. This continuous rotation prevents microorganisms from settling and forming biofilm on the adsorption surfaces, while also enabling timely replacement of contaminated layers. The previously harmful water flow and microbial activity are thus transformed into a self-cleaning and self-renewing sampling process.
4Adaptability or versatility
If multiple filtering surfaces are used for sampling at different heights, then the sampling coverage is improved, but the device complexity increases
Solution Approach 1:
The device employs a universal floating marking unit that can mark water levels at different heights, and a modular passive sampling unit with multiple filtering surfaces that can be positioned at various depths. The transmission mechanism and adsorption drum system provide a unified solution for sampling at multiple heights, allowing the same basic structure to adapt to different sampling requirements without requiring entirely separate systems for each height level.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves stable sampling by anchoring the inserting drill bit into underwater soils, reducing the impact of water flow and microorganisms, and allows for timely replacement of the adsorption layer, improving the accuracy of water body sampling at different heights.
Implementation Method 1
anchoring the inserting drill bit into underwater soils, reducing the impact of water flow
Implementation Method 2
DGT technology collects and concentrates pollutants by simulating the natural diffusion process of pollutants in water bodies
Implementation Method 3
an inner side of the filtering surfaces is arranged with a diffusion layer plate and an adsorption part
Implementation Method 4
a floating marking unit, the floating marking unit includes a winding cylinder I arranged at the top of the passive sampling unit
Data Source
AI summary
A DGT passive sampling device for water body detection includes a bottom fixed unit, where the bottom fixed unit includes an inserting drill bit; a passive sampling unit arranged at the top of the bottom fixed unit; and a floating marking unit arranged at the top of the passive sampling unit, where the floating marking unit includes a winding cylinder I, and the winding cylinder I is movably connected to the chassis by control inner ropes. After the inserting drill bit is inserted into the underwater soils, the bottom cavity winding source is started, the rotation of the bottom cavity roll releases the downward movement of the middle ropes, so that the passive sampling unit falls, while the bottom cavity roll may make the passive sampling unit regularly distributed at different heights of the water bottom by releasing different lengths of the middle ropes.