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A method for simultaneously detoxifying and dehydrating cyanobacteria

A technology for cyanobacteria and filter press dehydration, which is applied in the field of cyanobacteria pollution control, can solve the problems of high moisture content in algae-rich water, unfavorable transportation and final disposal, and increased volume of cyanobacteria, so as to facilitate large-scale industrial production and reduce weight and volume , high dehydration effect

Inactive Publication Date: 2016-01-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the high moisture content of algae-rich water after salvage of cyanobacteria is not conducive to subsequent transportation and final disposal, and the moisture content of the existing cyanobacteria dehydration method is still high after using flocculant dehydration. Technical problems such as the increase in the volume of cyanobacteria that need to be treated after dehydration of coal ash, lime, etc., provide a method for detoxification and dehydration of cyanobacteria with low energy consumption, high efficiency and fast

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  • A method for simultaneously detoxifying and dehydrating cyanobacteria
  • A method for simultaneously detoxifying and dehydrating cyanobacteria
  • A method for simultaneously detoxifying and dehydrating cyanobacteria

Examples

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Embodiment 1

[0037] A method for simultaneously detoxifying and dehydrating cyanobacteria, specifically comprising the following steps:

[0038] (1) Add concentrated nitric acid to the salvaged cyanobacteria (initial water content 98%) and stir evenly to adjust the pH of the cyanobacteria to 3.

[0039] (2) Add 1.8 mol / kg hydrogen peroxide solution of dry weight of cyanobacteria to the cyanobacteria with pH 3 in step (1), stir evenly, and then treat with microwave radiation at 120°C for 25min. Stir the cyanobacteria rapidly at a stirring speed of 80 r / min while microwave treatment.

[0040] (3) The cyanobacteria obtained after step (2) are dehydrated through a plate and frame filter press. The pore diameter of the filter cloth of the plate and frame filter press is 15 μm.

[0041] The capillary water absorption time of the untreated cyanobacteria in this example is greater than 89s, the calorific value on a dry basis is 19.89MJ / kg, and the microcystin content on a dry basis is 9237 μg / kg...

Embodiment 2

[0043] A method for simultaneously detoxifying and dehydrating cyanobacteria, specifically comprising the following steps:

[0044](1) Add concentrated sulfuric acid to the salvaged blue-green algae (initial water content of 95%) and stir evenly to adjust the pH of the blue-green algae to 2.

[0045] (2) Add 2.5 mol / kg dry weight of cyanobacteria peracetic acid solution to the cyanobacteria with a pH of 2 in step (1), stir evenly, and then treat with microwave radiation at 130° C. for 20 minutes. Stir the blue-green algae rapidly at a stirring speed of 100 r / min while microwave treatment.

[0046] (3) The cyanobacteria obtained after the step (2) are dehydrated through a chamber filter press. The pore diameter of the filter cloth of the chamber filter press is 30 μm.

[0047] The capillary water absorption time of the untreated cyanobacteria in this example is 365s, the calorific value on a dry basis is 20.48MJ / kg, and the microcystin content on a dry basis is 11245 μg / kg. ...

Embodiment 3

[0049] A method for simultaneously detoxifying and dehydrating cyanobacteria, specifically comprising the following steps:

[0050] (1) Add concentrated hydrochloric acid to the salvaged cyanobacteria (initial water content 99%) and stir evenly to adjust the pH of the cyanobacteria to 5.

[0051] (2) Add 1.3 mol / kg dry weight of blue-green algae peracetic acid solution to the blue-green algae with a pH of 5 in step (1), stir evenly, and then treat it with microwave radiation at 110° C. for 15 min. Stir the cyanobacteria rapidly at a stirring speed of 40 r / min while microwave treatment.

[0052] (3) The cyanobacteria obtained after step (2) are dehydrated through a membrane filter press. The pore diameter of the filter cloth of the membrane filter press is 10 μm.

[0053] The capillary water absorption time of the untreated cyanobacteria in this example was 76s, the calorific value on a dry basis was 19.45 MJ / kg, and the microcystin content on a dry basis was 6579 μg / kg. The...

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Abstract

The invention discloses a method for simultaneously detoxifying and dehydrating blue-green algae, which specifically comprises the following steps: adjusting the pH of blue-green algae to be acidic; adding an oxidant to the acidic blue-green algae, and then performing microwave radiation treatment; Carry out pressure filtration and dehydration to complete the treatment of cyanobacteria. The invention can carry out detoxification and rapid dehydration treatment on large quantities of salvaged cyanobacteria, with simple equipment, low use cost, convenient operation and maintenance, high degree of dehydration, greatly reduced volume of cyanobacteria, thorough detoxification, no secondary pollution, and broad application potential. Application prospects.

Description

technical field [0001] The invention relates to the technical field of cyanobacteria pollution control, in particular to a method for simultaneously detoxifying and dehydrating cyanobacteria. Background technique [0002] Algae blooms in eutrophic water bodies are a global problem. In the past two decades, with the rapid development of industry and agriculture, the rapid increase of population, and the acceleration of urbanization, a large amount of untreated domestic sewage and industrial and agricultural production wastewater have been discharged into rivers, lakes and seas, seriously polluting the water environment. Nutritization is intensified. The eutrophication of the water body has led to the flooding of many freshwater lakes and the frequent occurrence of red tides in the bay. The toxic substances (algae toxins) released by a large number of cyanobacteria, the odorous substances and organic substances released after the death of cyanobacteria have seriously deterior...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D37/00B01J19/12
Inventor 袁兴中肖智华陈晓红李飞蒋龙波王侯吴志斌曹亮曾光明
Owner HUNAN UNIV
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