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Spirulina dehydration method

A technology for dehydration of cyanobacteria and filter press, applied in chemical instruments and methods, dehydration/drying/concentrated sludge treatment, water/sludge/sewage treatment, etc., can solve the disadvantages of increased cyanobacteria volume and high moisture content of algae-enriched water Transportation and final disposal and other issues, to achieve the effect of weight and volume reduction, convenient large-scale industrial production, and fast processing speed

Inactive Publication Date: 2017-02-22
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the high moisture content of the 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 dehydration using flocculants. Technical problems such as increased volume of cyanobacteria to be treated after dehydration of coal ash, lime, etc., provide a cyanobacteria with low energy consumption, fast processing speed, simple operation, greatly reduced volume of cyanobacteria after treatment, no change in calorific value and high degree of dehydration dehydration method

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Examples

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Embodiment 1

[0034] A method for cyanobacteria dehydration, comprising the following steps:

[0035] (1) Ultrasonic: The salvaged cyanobacteria (the initial moisture content of the salvaged cyanobacteria is 98%) is subjected to ultrasonic frequency of 50kHz and sound intensity of 0.7W / cm 2 , Ultrasonic treatment with a sound energy density of 0.8W / ml for 3min.

[0036] (2) Adding a flocculant: adding polyferric sulfate to the sonicated cyanobacteria at a ratio of 2% of the dry weight of the cyanobacteria, and stirring evenly to obtain cyanobacteria added with a flocculant.

[0037] (3) Dehydration by filtration: the cyanobacteria added with flocculant in step (2) are dehydrated by filtration through a membrane filter press, the pore diameter of the filter cloth of the membrane filter press is 20 μm, and the dehydration of cyanobacteria is completed.

[0038] The capillary water absorption time of the untreated cyanobacteria in this embodiment was 89s, and the dry basis calorific value was...

Embodiment 2

[0040] A method for cyanobacteria dehydration, comprising the following steps:

[0041] (1) Ultrasound: the salvaged cyanobacteria (the initial moisture content of the salvaged cyanobacteria is 95%) undergoes a frequency of 80kHz and a sound intensity of 0.6W / cm 2 , Ultrasonic treatment with a sound energy density of 0.5W / ml for 4min.

[0042] (2) Adding flocculant: adding polyaluminum chloride to the sonicated cyanobacteria at a ratio of 4% of the dry weight of cyanobacteria, and stirring evenly to obtain cyanobacteria with flocculant added.

[0043] (3) Filtration dehydration: the cyanobacteria added with flocculant in 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 about 10 μm, and the cyanobacteria dehydration is completed.

[0044]The capillary water absorption time of the untreated cyanobacteria in this embodiment is 365s, and the calorific value on a dry basis is 20.48 MJ / kg. ...

Embodiment 3

[0046] A method for cyanobacteria dehydration, comprising the following steps:

[0047] (1) Ultrasound: the salvaged cyanobacteria (the initial water content of the salvaged cyanobacteria is 99%) undergoes a frequency of 110kHz, and the sound intensity is 0-1.2W / cm 2 , Ultrasonic treatment with a sound energy density of 0.7W / ml for 5min.

[0048] (2) Adding a flocculant: adding polyferric chloride to the sonicated cyanobacteria at a ratio of 1% of the dry weight of the cyanobacteria, and stirring evenly to obtain cyanobacteria with flocculant added.

[0049] (3) Filtration dehydration: The cyanobacteria added with the flocculant in step (2) are dehydrated by pressure filtration through a chamber filter press, the pore diameter of the filter cloth of the chamber filter press is 15 μm, and the cyanobacteria dehydration is completed.

[0050] The capillary water absorption time of the untreated cyanobacteria in the present embodiment was 76s. See figure 1 .

[0051] From fig...

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Abstract

The invention discloses a blue algae dehydrating method. The method comprises the steps of performing ultrasonic processing, adding a flocculant and filter-pressing to dehydrate, wherein the specific steps are as follows: ultrasonically processing the blue algae for 2-6min; adding the flocculant in the blue algae after the ultrasonic processing, and uniformly stirring; filter-pressing the blue algae after adding the flocculant to dehydrate. Through the adoption of the method disclosed by the invention, the volume of the blue algae is greatly reduced, the heat value is not changed, and the dehydrating degree is high; the processing speed is high, the operation is simple, the large-scale production is facilitated, and the method has wide application prospect.

Description

technical field [0001] The invention relates to the technical field of cyanobacteria pollution, in particular to a method for dehydrating cyanobacteria, in particular to an ultrasonic-assisted dehydration method for 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 o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/12C02F11/14
CPCC02F11/121C02F11/14C02F2303/06
Inventor 袁兴中肖智华陈晓红黄超冷立健江洪炜张海波曾光明
Owner HUNAN UNIV
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