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Modified clay capable of eliminating red tide with high efficiency

A modified clay technology, which is applied in seawater treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of algae cell breakage, secondary pollution, high oxidant dose, etc., and achieve the goal of improving binding capacity, reducing dosage, and enhancing binding Effect

Active Publication Date: 2016-01-13
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, it has been found in practice that the dose of oxidant required to eliminate red tide organisms through killing is relatively high, and killing algal cells often causes the destruction of algal cells, and some substances in the cells, such as algal toxins, intracellular dissolved organic matter, etc. Will be released from cells, may cause secondary pollution

Method used

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  • Modified clay capable of eliminating red tide with high efficiency
  • Modified clay capable of eliminating red tide with high efficiency
  • Modified clay capable of eliminating red tide with high efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Use inorganic aluminum salts as modifiers (inorganic aluminum salts are aluminum chloride, aluminum sulfate or polyaluminum chloride), make it into a certain concentration of aqueous solution, and then add powder clay minerals in proportion, use alkalization (such as caustic Potassium, caustic soda, soda ash, quicklime, slaked lime, etc.) to adjust the pH value of the mixture to 4-6, and obtain different types of modified clay suspensions after aging and stabilization. Among them, the aluminum concentration in the modified clay suspension is 2.85×10 -2 The removal of Chrysococcus (cell density 1.2×10 7 cells / ml) as an example, add the above-mentioned different types of modified clay to the algae liquid to reach 0.10, 0.20, 0.25, 0.30, 0.40, 0.50, 0.75, 1.0g / L, shake well, and observe after 2.5 hours Changes in the cell density of Chrysococcus spp. in algae fluid. The algae removal efficiency of various modified clay compositions at different concentrations is as follo...

Embodiment 2

[0025] As described in Example 1, the efficiency of the above-mentioned different types of modified clays for removing high-density chlorella in water bodies was determined, and compared with unmodified clays of the same concentration. The cell density of Chlorella used was 1.12×10 8 cells / ml, add modified clay to a concentration of 0.40g / L, shake well, and observe the algae removal efficiency after standing still for 2.5 hours. Algae removal efficiency of different clays such as figure 2 As shown, the results show that the algae removal efficiency of aluminum chloride modified soil or aluminum sulfate modified soil is higher (see figure 2 ).

Embodiment 3

[0027] As described in Example 1, the efficiency of the above-mentioned different types of modified clays in removing high-density Heterocurvium akashiwo in water bodies was determined, and compared with the same concentration of unmodified clays. The cell density of H. akashiwo used was 7.2×10 4 cells / ml, add modified clay to a concentration of 0.10, 0.20, 0.35, 0.50, 0.75, 1.0, 1.5, 2.0, 2.5g / L, shake well, and observe the algae removal efficiency after standing still for 2.5 hours. Algae removal efficiency as image 3 As shown, the results show that the algae removal efficiency of aluminum chloride modified soil or aluminum sulfate modified soil is higher (see image 3 ).

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Abstract

The invention belongs to disaster prevention and mitigation strategies in the field of water ecological safety, and further relates to the fields of control and treatment of red tide in offshore water areas, and specifically to modified clay capable of eliminating the red tide with high efficiency. The modified clay is a compound material prepared from inorganic aluminum salt, clay mineral and an oxidant in a ratio of 500: 0-1: 1-50 by weight. When in use, the modified clay is uniformly mixed with seawater into a uniform suspension which is sprayed on the surface of the red tide water according to a certain concentration, so the effect of rapid elimination of a large number of red tide organisms in water is achieved. The modified clay can solve the problems of harsh application conditions and difficult highly-efficient large-scale application of common PAC modified clay in treatment of the red tide.

Description

technical field [0001] The design of the present invention belongs to the disaster prevention and reduction strategy in the field of water ecological security, and further relates to the field of control and management of red tides in offshore waters, specifically a modified clay that can efficiently eliminate red tides. Background technique [0002] Red tide (Redtide) refers to the sudden proliferation and accumulation of planktonic microalgae, protozoa or bacteria in seawater in a short period of time under certain environmental conditions, causing serious damage to the water ecosystem and catastrophic changes in water color. ecological anomalies. [0003] In recent years, the frequency and intensity of red tide outbreaks in my country's coastal waters have been increasing, which has seriously affected the ecological security of coastal waters. In order to effectively reduce the harm of red tide disasters, especially in some breeding areas, nursery areas and some landscap...

Claims

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Application Information

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