Method for treatment of sea red tides and fresh water bloom

A seawater and red tide technology, applied in separation methods, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc., can solve problems such as accelerated decomposition and no substantial improvement

Inactive Publication Date: 2003-05-14
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can not only flocculate the algal cells in the sedimentation water, but also accelerate the decomposition o

Method used

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  • Method for treatment of sea red tides and fresh water bloom
  • Method for treatment of sea red tides and fresh water bloom
  • Method for treatment of sea red tides and fresh water bloom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 sepiolite extraction preparation

[0020] Dry the raw sepiolite, crush it to a certain particle size (70-180 mesh), disperse it in distilled water, prepare a suspension with a concentration of about 10g / L, stir it and let it stand for 30 minutes, and take out the supernatant by siphoning. The obtained supernatant was centrifuged at 12,000 rpm for 10 minutes, the obtained sediment was collected, dried at 65°C for 12 hours, ground to 180 mesh, and analyzed by X-ray diffraction, the purity of the obtained sepiolite was over 90%.

Embodiment 2

[0021] Example 2 Fe 3+ Modified sepiolite

[0022] Take by weighing the prepared 1.00g sepiolite (90%) of embodiment 1, be dispersed in 50mL, the Fe of 1000mg / L 3+ solution (with NH 4 Fe(SO 4 ) 2 12H 2 O preparation), shake at room temperature for 5 hours, centrifuge at 12,000 rpm for 10 minutes, collect the obtained sepiolite and dry it at 65°C for 12 hours, and grind to 180 meshes to obtain modified sepiolite.

Embodiment 3

[0023] Embodiment 3 Sepiolite flocculation removes the embodiment of algae

[0024] Take by weighing 0.1g of sepiolite prepared in Example 1 in an 800ml beaker, add 500ml of it quickly and prepare a concentration of 4.78*10 6 The algae liquid of cell / ml (the algae liquid is prepared with 0.5% NaCl solution), is placed on the six-coagulation mixer and starts stirring immediately, and starts timing simultaneously. Stirring parameters are: rapid stirring at 600 rpm for 4 minutes, then transfer to 50 rpm and continue stirring for 2 minutes, and finally stop stirring and let stand. Samples were taken at about 3 cm below the liquid level every hour to measure the algal cell concentration, and the algal cell removal rate was calculated. The result is as figure 1 (dosage is 0.2g / l). Depend on figure 1 It can be seen that after 100 minutes of treatment, the algae removal rate has exceeded 90%, and after 300 minutes, the algae removal rate has exceeded 99%, which is close to complet...

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Abstract

The present invention relates to a method of tackling sea red tides and fresh water bloom using clay as algae flocculant. The effective component of the flocculant is hydrated magnesio-silicate salt in the laminated structure including upper and lower silicon-oxygen tetrahedron layers and sandwiched magnesium-oxygen octahedron layer. The hydrated magnesio-silicate salt is easy to prepare, low in cost and high in algae flocculating elimination effect.

Description

technical field [0001] The invention relates to a method for controlling seawater red tide and freshwater bloom. Specifically, the active ingredient is used as the unit cell (Si 6 o 15 ) or (Si 4 o 10 A method for treating seawater red tides and freshwater blooms with a flocculant of hydrous magnesium silicate as a structural unit. Background technique [0002] The outbreak of harmful algae in natural seawater, lakes and rivers (commonly known as red tide in seawater and algae bloom in freshwater) has become a global environmental pollution problem. It not only seriously deteriorates water quality, depletes oxygen, and causes a large number of fish to die, but also algae toxins can enter the food chain and cause human diseases and even death. So far, there is no technology in the world that can safely, effectively, economically and comprehensively manage such large-scale natural disasters (Anderson, D.M., 1997 Turning back the harmful red tide, Nature, 388, 513-514.). ...

Claims

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Application Information

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IPC IPC(8): B01D21/01C02F1/50C02F1/52
Inventor 潘纲张明明阎海
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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