A kind of composite coagulant for removing cyanobacteria without damage and its preparation method and application

A coagulant and blue-green algae technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of destroying algal cell walls and releasing intracellular algal toxins, etc. Achieve the effects of simple operation process, good stability, and significant social and economic effects

Active Publication Date: 2016-03-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the compound coagulants currently used for the treatment of cyanobacteria have certain limitations in the treatment of cyanobacteria cells.
For example, the publication number is CN102976473A, and the name is "a method for controlling the growth of Microcystis aeruginosa by using copper salt and chloramine in combination", which discloses an aqueous solution of copper salt and an aqueous solution containing active chlorine and an aqueous solution of ammonia salt. The method of adding chloramine to algae-containing water to control the growth of Microcystis aeruginosa is that it destroys the algal cell wall, thereby causing the release of intracellular algal toxins
The publication number is CN102701345B, and the name is "a pre-oxidation-coagulation method for algae removal based on in-situ generation of double coagulants" discloses a method of sequentially adding oxidants, ferrous salts and aluminum salts, etc. Live algae cells, and the ferrous salt terminates the pre-oxidation and the new ecological ferric and aluminum salts generated by the oxidation of the ferrous salt are used as a double coagulant to strengthen the coagulation of algal cells. use of the release into water bodies

Method used

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  • A kind of composite coagulant for removing cyanobacteria without damage and its preparation method and application
  • A kind of composite coagulant for removing cyanobacteria without damage and its preparation method and application
  • A kind of composite coagulant for removing cyanobacteria without damage and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 The present invention CTS-AlCl 3 Selection of Composite Coagulant

[0026] Determine CTS-AlCl of the present invention by response surface method 3 The optimal coagulant parameters of composite coagulant are: CTS concentration 2.5mg / L, AlCl 3 With a concentration of 7.5mg / L, the predicted optimum removal rate of Microcystis aeruginosa was 96.28%, and the concentration of extracellular microcystin was 51.59%. The verification test is carried out on the parameters obtained from the response surface, and the specific operation process is as follows:

[0027] 1) CTS-AlCl 3 Preparation of composite coagulant

[0028] a) Chitosan (CTS) is produced by Qingdao Haisheng Biological Engineering Co., Ltd. Weigh 100mg of CTS, add 10mL of 1% acetic acid solution and stir continuously to dissolve it completely, then add distilled water to 100mL to obtain a 1g / LCTS stock solution.

[0029] b), aluminum chloride (AlCl 3 ) stock solution 3g / L: 1.5g analytically pure Al...

Embodiment 2

[0034]In this study, M.aeruginosa FACHB-905, a typical MCs toxin-producing algae species, was selected as the coagulation treatment object. The samples of Prototheca were cultured in BG11 culture medium, under the conditions of 14h / 10h photoperiod and constant temperature at 25°C. Harvest the algae cells at the end of the logarithmic growth phase (about 10 days after culture).

[0035] Take 1L of Microcystis aeruginosa suspension and place it in a 1L beaker, place the beaker on a six-coagulation mixer and start stirring immediately, and start timing at the same time. The microcystis aeruginosa suspension to be treated was stirred rapidly for 30 seconds, and after mixing evenly, the above-mentioned composite coagulant (adding concentration was 10 mg / L) was added respectively in the beaker, after continuing to stir rapidly for 2 minutes, turn to slow stirring for 20 minutes, and finally Place precipitation for 30min, the fast stirring speed is 250r / min, and the slow stirring sp...

Embodiment 3

[0065] Example 3AlCl 3 , CTS and CTS-AlCl 3 Comparison of Effects of Compound Coagulants on Removal of Extracellular Polymers

[0066] The preparation concentration is 2×10 6 cell / mL algae liquid, take three 1L beakers and take 1L of Microcystis aeruginosa suspension, place the beakers on a six-coagulation mixer and start stirring immediately, and start timing at the same time. The Microcystis aeruginosa suspension to be treated was stirred rapidly for 30s, and after mixing evenly, 10mg / L of CTS-AlCl of the present invention was added to 3 beakers respectively 3 Compound coagulant, 7mg / LCTS flocculant (the optimal dose of CTS alone), 15mg / LAlCl 3 Coagulant (adding AlCl alone 3 optimal dosage). After continuing to stir rapidly for 2 minutes, turn to slow stirring for 20 minutes, and finally let it settle for 30 minutes. The fast stirring speed is 250r / min, and the slow stirring speed is 20r / min.

[0067] Since extracellular polymeric EOM forms disinfection by-products du...

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Abstract

The invention discloses a composite coagulant for removing blue algae without breakage as well as a preparation method and application of the composite coagulant. The composite coagulant is formed by mixing main components, namely, chitosan CTS and AlCl3 according to a mass ratio ranging from (1-7) to (1-15), mixing a CTS stock solution and an AlCl3 stock solution according to different coagulant mass ratios, adding the mixture into a beaker, and stirring at a normal temperature and a normal pressure until the mixing is completely finished. Breakage-free removal of more than 97% of microcystis aeruginosa cells can be realized under a preferred CTS-AlCl3 composite coagulant reaction condition, 53% of extracellular microcystic toxins are adsorbed, and removal of most extracellular polymeric substances is realized. Aiming at the removal of blue algae, the adopted CTS-AlCl3 composite coagulant is efficient, steady, environmental friendly and the like, and has potential application value and market competitiveness.

Description

technical field [0001] The invention relates to a novel composite coagulant for algae removal, which belongs to the technical field of environmental protection. Background technique [0002] In recent years, cyanobacteria blooms have occurred in inland freshwater lakes such as Taihu Lake, Chaohu Lake, Dianchi Lake, Xuanwu Lake, and Donghu Lake in my country for many times, which has seriously affected people's lives and industrial and agricultural production, especially those that use these lakes as water sources. In regions, cyanobacteria blooms directly threaten the safety of drinking water. This is mainly due to the release of algal toxins due to the damage of cyanobacteria cells, which seriously endanger people's health. Most of the metabolites of cyanobacteria (up to 98%) are inside the cells. Studies have shown that removing dissolved microcystins is much more difficult than removing algal cells. Therefore, in the drinking water treatment process, the control of algal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/56
CPCC02F1/50C02F1/5236C02F1/5263C02F1/54
Inventor 裴海燕马春霞李秀青徐杭州
Owner SHANDONG UNIV
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