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Method for disposing water containing massive algae on basis of calcium-peroxide-enhanced coagulation

A technology of calcium peroxide and high-algae water, which is applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc., and can solve the problem of chemical types, complex steps of chemical pretreatment process, and algae fragmentation and death , increase dissolved oxygen and other issues, to achieve the effect of improving coagulation effect, reducing dosage and promoting hydrolysis

Active Publication Date: 2019-02-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The function of calcium peroxide in this patent is mainly to increase the dissolved oxygen in water, and the whole reaction process lasts for 14 to 22 hours. The types of agents involved in the method, the pretreatment of agents, and the process steps are complicated, which eventually leads to the complete death of algae and releases more A lot of intracellular organic matter causes secondary pollution, so it is not suitable for promotion and use in actual water bodies

Method used

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  • Method for disposing water containing massive algae on basis of calcium-peroxide-enhanced coagulation
  • Method for disposing water containing massive algae on basis of calcium-peroxide-enhanced coagulation
  • Method for disposing water containing massive algae on basis of calcium-peroxide-enhanced coagulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Comparison of the effects of different calcium peroxide preoxidation times on strengthening coagulation and sedimentation.

[0030] 1) Dilute Microcystis aeruginosa to about 2×10 with tap water 6 Algae / mL, respectively put into beakers to prepare for the experiment.

[0031] 2) The configured CaO 2 The solution is added to the algae water at a concentration of 0.5mmol / , fully stirred, and pre-oxidized for 0-120mins.

[0032] 3) Then add 0.1mmol / L ferrous sulfate coagulant (15.2mg / L FeSO 4 ) for coagulation, first rapid coagulation under the condition of 200r / min for 2mins, then coagulation under the condition of 50r / min for 15mins, and finally settling for 10, 20, 30mins, sampling and testing.

[0033] the result shows( figure 1 ), with CaO 2 The removal rate of algae gradually increased with the increase of preoxidation time. When the pre-oxidation time=30mins, the removal rate of algae measured after 30mins of coagulation and sedimentation can be as high as 94.9...

Embodiment 2

[0035] Comparison of the effects of different calcium peroxide oxidant dosing sequences on strengthening coagulation and sedimentation.

[0036] 1) Dilute Microcystis aeruginosa to about 2×10 with tap water 6 Algae / mL, respectively put into beakers to prepare for the experiment.

[0037] 2) Simultaneous addition of oxidant and coagulant experiment (SiDS): the configured CaO 2 The solution was added to the algae water according to the concentration gradient of 0.05, 0.15, 0.3, 0.5, 1.0mmol / L, and then immediately added 0.1mmol / L ferrous sulfate coagulant (15.2mg / L FeSO 4 ), simultaneously oxidizing and coagulating. First, stir rapidly under the condition of 200r / min for 2mins, then stir slowly under the condition of 50r / min for 15mins, and finally let it settle for 30mins, and take samples for testing.

[0038]3) Dosing the oxidant first and then adding the coagulant experiment (SuDS): the prepared CaO 2 The solution was added into the algae water according to the concentra...

Embodiment 3

[0041] Effect of calcium peroxide preoxidation enhanced coagulation on the integrity of algae cells

[0042] 1) Dilute Microcystis aeruginosa to about 2×10 with tap water 6 Algae / mL, respectively put into beakers to prepare for the experiment.

[0043] 2) The configured CaO 2 The solution was added into the algae water according to the concentration gradient of 0, 0.05, 0.15, 0.3, 0.5, 1.0mmol / L, fully stirred, and pre-oxidized for 30mins.

[0044] 3) Then add 0.1mmol / L ferrous sulfate coagulant (15.2mg / L FeSO 4 ) Coagulation. Firstly, coagulate quickly for 2mins under the condition of 200r / min, then coagulate for 15mins under the condition of 50r / min, and finally let it settle for 30mins, and take samples to measure K + .

[0045] the result shows( Figure 4 ), with CaO 2 Concentration increases, K + The concentration change is very small, indicating that calcium peroxide is a mild oxidant, which has little or no damage to the integrity of algae cells and will not cau...

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Abstract

The invention relates to a method for disposing water containing massive algae on the basis of calcium-peroxide-enhanced coagulation. The method includes the steps of adding calcium peroxide into thewater containing the massive algae and adding an iron salt coagulant, wherein calcium peroxide and the coagulant can catalyze the generation of free radicals used for oxidizing and inactivating algaecells. Compared with the prior art, the method is based on a Fenton-like technology of calcium peroxide, enhanced coagulation and sedimentation for disposing the water containing the massive algae areachieved, the use dosage of the coagulant can be reduced, synchronous and efficient removal of the algae and organic matter is achieved, and the algae are inactivated without causing cell disruptionand releasing intracellular organic matter. The method is an environmentally friendly pollution-free technology with a great prospect.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for treating high-algae water based on calcium peroxide enhanced coagulation. Background technique [0002] Due to the rapid development of society, human activities such as industry and agriculture have brought a large amount of pollutants and discharged them into water bodies, resulting in eutrophication of water bodies, which has greatly increased the frequency and scale of cyanobacteria blooms in reservoirs, lakes and coasts in summer. The frequent occurrence of cyanobacteria blooms has brought a series of environmental problems, such as affecting the aesthetics of the environment, producing foul odors, increasing the difficulty of water treatment technology, and causing health risks, etc., which have attracted great attention both internationally and domestically. At present, coagulation-sedimentation-filtration is still the main process of drinking water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/72
CPCC02F1/5236C02F1/722C02F2103/007
Inventor 唐玉霖辛怀佳杨舒吴梦怡刘倩宏
Owner TONGJI UNIV
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