A deep dehydration method of cyanobacteria mud based on thermal rearrangement of capsular polysaccharide soft lattice

A technology of capsular polysaccharide and deep dehydration, which is applied in the field of environmental engineering, can solve the problems of increasing the difficulty of filtrate treatment, adding various types of medicaments, and tedious pre-treatment, etc., and achieves the effect of expanding utilization channels, improving quality, and being easy to handle.

Active Publication Date: 2021-10-08
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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  • A deep dehydration method of cyanobacteria mud based on thermal rearrangement of capsular polysaccharide soft lattice

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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Abstract

The invention provides a method for deep dehydration of blue-green algae mud based on capsular polysaccharide soft lattice thermal rearrangement, including pretreatment of blue-green algae mud, adding multivalent cationic salts through heating, and adjusting the pH value range to 1.5-5, so that blue-green algae mud The ratio of the storage modulus to the loss modulus is less than 3.0 to ensure the thermal rearrangement of the capsular polysaccharide soft lattice in the cyanobacteria mud, and then pump the treated cyanobacteria mud into the preheated dehydration device, preheat The temperature ranges from 70 to 100°C for hot-press dehydration. The invention has simple process, mild reaction, good dehydration effect, does not add conditioners such as calcium oxide and clay, not only saves costs, but also reduces the content of inorganic matter in the cyanobacteria cake, relatively increases the content of organic matter and calorific value in the filter cake, and does not It will increase the COD of the filtrate; the dehydrated and dried cyanobacteria powder has a high content of organic matter (volatile solids / total solids > 85%) and a high calorific value, which helps to expand the utilization of cyanobacteria resources and improve the quality of subsequent products.

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 Patents(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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