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Modified clay composite material capable of efficiently removing microalgae red tide and preparation method thereof

A composite material and clay technology, applied in chemical instruments and methods, water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of increasing the cost of ultra-micro algae red tide, operation intensity, and complicated practical operation procedures, etc. Achieve the effect of efficient removal of ultra-micro algae red tide, high removal ability, and good removal effect

Inactive Publication Date: 2017-08-11
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual application, it is found that the invention has complex practical operation procedures and needs to add drugs at secondary intervals, which greatly increases the cost and work intensity of the modified clay method for controlling ultramicro algae red tides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Aureococcus anophagefferens is the main biological species that causes red tide in Qinhuangdao coastal area in recent years. The microalgae is only 2-4μm in size, which belongs to ultramicroalgae; the biological density can reach 10 when the red tide is formed. 8 above cell / L.

[0023] The modified clay composite material of the present invention is polyaluminum chloride, clay and sodium sulfate (mass ratio 1:5:0.8); wherein, the molar weight of sodium sulfate is equivalent to the molar weight of aluminum ions in the modified clay system material;

[0024] Obtaining of modified clay composite material: use 1 part of polyaluminum chloride to 5 parts of clay (the mass ratio of the two is 1:5), modify it according to the conventional wet modification method, and the aging after mixing Add sodium sulfate equivalent to the molar amount of aluminum ions to the composite system in stages, and after aging at room temperature for 12 hours, a stable new modified clay composite m...

Embodiment 2

[0029] Use 1 part of polyferric chloride to carry out wet modification treatment to 4 parts of clay (the mass ratio of the two is 1:4). After aging for 12 hours, a stable new modified clay material can be obtained.

[0030] The modified clay composite material obtained above was formulated into a suspension, and then sprayed on the surface of the Chrysococcus spp. red tide water body at a concentration of 0.5g / L. After 3 hours, the removal efficiency was 93%, while the same amount of traditional polyferric chloride Modified clay is only 40%.

Embodiment 3

[0032] H. akashiwo is a common harmful red tide organism in aquaculture water, and its cell size is about 15 μm. Using the new modified clay composite material in Example 1, according to the concentration of 0.5g / L sprayed on the surface of Heteroflexus akashiwo water body, the removal efficiency after 3 hours was 90%, while the same amount of traditional polyaluminum chloride modified clay 85%.

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Abstract

The invention belongs to treatment methods of seawater algal pollution, and particularly relates to a modified clay composite material capable of efficiently removing microalgae red tide, a preparation method thereof and a method utilizing the composite material to remove ultramicro algae red tide. The modified clay composite material is inorganic polymeric flocculant modified clay synthesized by adopting sulfate as a polymerization bridge. When the composite material is used, quick removal of red tide can be realized by directly utilizing seawater as a dispersant, premixing to be turbid liquid of certain concentration and then spraying the turbid liquid onto the surface of an ultramicro algal red tide water body. The novel modified clay composite material has efficient removal capability to ultramicro algae and has good removal effect on common microalgae red tide.

Description

technical field [0001] The invention belongs to a treatment method for seawater algae pollution, in particular to a modified clay composite material for efficiently removing microalgae red tides, a preparation method thereof, and a method for removing ultramicroalgae red tides by using the composite material. Background technique [0002] With the increasing impact of global climate change and human activities on the coastal water environment, the hazard-causing organisms in the harmful red tide phenomenon tend to be miniaturized. For example, in recent years, the brown tide phenomenon of thousands of square kilometers in the Bohai Sea adjacent to Qinhuangdao in my country is caused by some unicellular algae with a cell size of only 2-4 μm. According to the suggestion of Ning Xiuren et al. (Ning Xiuren, Marine micro and nano plankton, Donghai Ocean, 1997, 15(3): 60-64), the microalgae whose cell size is less than 5 μm can be classified as nano algae. These ultramicroalgal b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F103/08
CPCC02F1/5236C02F1/5263C02F2103/08
Inventor 曹西华俞志明
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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