Seawater nutrient salt online pre-filter device capable of preventing organism attachment

Abstract

The invention provides a seawater nutrient salt online pre-filter device capable of preventing organism attachment. Seawater is passively filtered by the pre-filter device for a plurality of times to eliminate interference of particles and suspended solids, so that the purpose of long-term measurement is achieved. The seawater nutrient salt online pre-filter device is capable of preventing marine organisms from attachment within the range of 0-200 m, the internal three stages of filter elements are a coarse particle first-stage filter element, a thin particle second-stage filter element and a third-stage filter element, and no extra nutrient salt is polluted after long-term use. The first-stage filter element, the second-stage filter element and the third-stage filter element are changed randomly to facilitate operation. The seawater nutrient salt online pre-filter device prevents the attaching organisms from growing, the three stages of filter elements effectively prevent large particles from entering an online measurement instrument, so that the filtering capacity is increased; a wood fiber and a resin material cause no pollution to the nutrient salt or adsorption influence, the structure and the material (high-density PVC material) of the used device can resist the hydraulic pressure at the water depth of 200 m, so that the requirement on the measurement of the nutrient salt in short sea or deep high sea is met, the filtering effect is remarkable, and the seawater nutrient salt online pre-filter device can be used in situ and on line for a long period of time.

Description

technical field [0001] The invention belongs to the field of in-situ on-line monitoring of seawater chemistry, and is a pre-pollution-free filtration treatment for long-term in-situ measurement of nitrate, phosphate, silicate and other nutrient salts in the ocean, and specifically relates to a seawater nutrient for preventing biological adhesion Salt in-line pre-filter. Background technique [0002] Nutrients such as nitrogen, phosphorus, and silicon in seawater are the basic nutrients of phytoplankton. The traditional method is to pass seawater through a 0.45 μm or 0.7 μm filter membrane to remove particulate matter, and then add reagents to react and develop color. In order to obtain high-time-resolution nutrient changes in the ocean, wet chemical reaction instruments are often used for in-situ online monitoring in the ocean. The principle is that when the peristaltic pump or piston inside the in-situ measurement instrument moves, seawater can be passively sucked into the ...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the pretreatment devices for nutrient monitoring at home and abroad are cellulose acetate filter membranes or glass fiber filter membranes used in laboratories, which cannot be used for online monitoring.

[0004] However, commercial online filtration devices are mostly used for groundwater sampling, which are expensive and prone to biofouling (such as Pall TM 、Millipore TM 、Whatman TM and other brands), the structure is simple such as only single-stage filtration, and glass fiber material is mostly used, which is easy to dissolve silicate, and is not suitable for long-term nutrient monitoring in seawater, especially in coastal high-turbidity seawater

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