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Blue-green alga mud deep-dehydration method based on thermal rearrangement of capsular polysaccharide soft lattices

A capsular polysaccharide and deep dehydration technology, applied in the field of environmental engineering, can solve the problems of increasing the difficulty of filtrate treatment, adding more types of drugs, and cumbersome pre-treatment, etc., to achieve the effects of expanding utilization channels, improving quality, and easy handling

Active Publication Date: 2019-12-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can dehydrate the blue-green algae mud to about 50%, its pre-treatment is more cumbersome, and there are many kinds of agents added, which is difficult for practical application
In addition, the application number is 201910040109.0, a method for deep dehydration of cyanobacteria, which uses the Fenton reaction to oxidize and degrade organic matter into small molecules, which is beneficial to dehydration by pressure filtration, but due to molecular degradation, the COD in the filtrate will increase significantly. Increased difficulty in handling the filtrate

Method used

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  • Blue-green alga mud deep-dehydration method based on thermal rearrangement of capsular polysaccharide soft lattices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Get 1.0 tons of fresh cyanobacteria mud with a water content of 90% (w / v), VS / TS as 91% in the stirring device, add 10kg of iron sulfate, that is, the amount of iron sulfate input is 10% (wt) of the cyanobacteria dry matter weight at this time. ). Use water vapor to heat the blue-green algae mud to 80°C, adjust the pH to 2.5, and stir for 30 minutes with a mixer. Take a sample and test the storage modulus and loss modulus under the corresponding temperature conditions, and confirm that the ratio of the two is less than 3.0. If it is higher than 3.0, add the amount of ferric sulfate, stir and mix, so that the storage modulus / loss modulus is less than 3.0 .

[0029] At the same time, pump 80°C circulating hot water into the unloaded diaphragm plate and frame filter press, filter out the hot water and return it to the hot water tank, preheat the diaphragm plate and frame filter press and stand by.

[0030] After the cyanobacteria slurry is stirred, it is pumped into a di...

Embodiment 2

[0035] Get 0.65 tons of fresh blue-green algae mud with a water content of 85% (w / v) and a VS / TS of 91%. Add 13kg of ferric chloride, that is, the dosage of ferric chloride is 13.3% (wt) of the dry matter weight of cyanobacteria. Use steam to heat the blue-green algae mud to 85°C, adjust the pH to 2.0, and use a mixer to stir for 25 minutes. Take samples and detect the storage modulus and loss modulus under corresponding temperature conditions, and confirm that the ratio of the two is less than 3.0. If it is higher than 3.0, adjust the pH value to 1.0-1.5, stir and mix well, so that the storage modulus / loss modulus is less than 3.0.

[0036] At the same time, pump 85°C circulating hot water into the unloaded filter press, filter out the hot water and return it to the hot water tank, preheat the filter press and stand by.

[0037] After the cyanobacteria slurry is stirred, it is pumped into a diaphragm plate and frame filter press for pressure filtration. After the feed press...

Embodiment 3

[0042] Get 1.6 tons of fresh blue-green algae mud with a water content of 94% (w / v) and a VS / TS of 91%. Add 6kg of aluminum sulfate, that is, the dosage of aluminum sulfate at this time is 6.25% (wt) of the dry matter weight of cyanobacteria. Use steam to heat the blue-green algae mud to 90°C, adjust the pH to 2.0, and use a mixer to stir for 20 minutes. Take samples and detect the storage modulus and loss modulus under corresponding temperature conditions, and confirm that the ratio of the two is less than 3.0. If it is higher than 3.0, supplement the amount of ferric sulfate, stir and mix, so that the storage modulus / loss modulus is less than 3.0.

[0043] At the same time, pump 90°C circulating hot water into the unloaded filter press, filter out the hot water and return it to the hot water tank, preheat the diaphragm plate and frame filter press and stand by.

[0044] After the cyanobacteria slurry is stirred, it is pumped into a diaphragm plate and frame filter press fo...

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PUM

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Abstract

The invention provides a blue-green alga mud deep-dehydration method based on thermal rearrangement of capsular polysaccharide soft lattices. The method comprises the following steps: pretreating blue-green alga mud, carrying out heating, adding a multivalent cationic salt, adjusting a pH value to 1.5-5, enabling a ratio of the energy storage modulus of the blue-green alga mud to the loss modulusof the blue-green alga mud to be less than 3.0 so as to ensure that capsular polysaccharide soft lattices in the blue-green alga mud to undergo thermal rearrangement, then pumping the treated blue-green alga mud into a preheated dehydration device, wherein a preheating temperature is in a range of 70-100 DEG C, and carrying out hot-pressing dehydration. The method has the advantages of simple process, mild reaction, good dehydration effect, no addition of conditioners such as calcium oxide and clay, cost reduction, capacity of reducing the inorganic matter content of a blue-green alga cake andrelatively increasing the organic matter content and the calorific value of a filter cake, and no increase in the COD of a filtrate; and dehydrated and dried blue-green alga powder is high in organicmatter content (with a ratio of volatile solid to total solid of more than 85%) and high in heat value, the recycling ways of blue-green alga can be increased, and the quality of subsequent productscan be improved.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to a deep dehydration method of blue-green algae mud based on capsular polysaccharide soft lattice thermal rearrangement. Background technique [0002] Cyanobacteria are ecological products produced after eutrophication of freshwater lakes. Since the cyanobacteria water crisis broke out in Taihu Lake in 2007, Wuxi City has been organizing scientific research forces to solve the problems of cyanobacteria salvage and harmless treatment, and has become an auxiliary center for the promotion of advanced cyanobacteria treatment technology to all parts of the country. At present, cyanobacteria mud with a water content of about 90% is generally landfilled, which occupies a large area and occupies land resources. Further volume reduction treatment of cyanobacteria mud is still required. Although cyanobacteria mud can be utilized as a resource through biogas production, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/147C02F11/122
CPCC02F11/122C02F11/147
Inventor 刘和郑志永余甜甜杨文杰叶元刘宏波
Owner JIANGNAN UNIV
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