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Preparation method for modified nanometer shell powder microalgae flocculant

A technology of shell powder and flocculant, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, special treatment targets, etc., can solve the secondary dehydration of concentrated algae liquid, secondary pollution, and affect the processing of microalgae biomass Utilize and other problems to achieve the effect of good flocculation separation effect and low production cost

Inactive Publication Date: 2017-12-26
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The harvesting of microalgae is an important part of microalgae cultivation. At present, air flotation, centrifugation, flocculation and other methods are mainly used. Among them, air flotation is suitable for large-scale cultivation, but the energy consumption of air flotation is high, and there are also challenges. The problem of secondary dehydration of the concentrated algae liquid harvested; centrifugation is suitable for small-scale and laboratory harvest; flocculation is a relatively economical and highly feasible method, and the selection of flocculants should be based on non-polluting, good effect, and low cost in principle
Chitosan in polysaccharide is a natural polymer compound, non-toxic, excellent biocompatibility, biodegradable, as an environmentally friendly, safe and healthy microalgae flocculant, it has been widely used in microalgae Flocculation and harvesting, but the flocculation effect of chitosan alone on microalgae is limited. If in order to reduce the cost and improve the flocculation effect, the combination of chitosan and inorganic materials will cause secondary pollution and affect the subsequent processing and utilization of microalgae biomass

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of a modified nano-shell powder microalgae flocculant in this embodiment comprises the following steps:

[0030] (1) Preparation of nano-shell powder: Soak discarded shells in 0.1% hydrochloric acid solution for 12 hours to remove various impurities on the surface of the shells, wash them with distilled water, and dry them in an oven. Put the above shells into a muffle furnace, calcinate at 600°C for 4 hours, take them out after cooling, grind them into powder with a nano pulverizer, and pass through a 1000-mesh sieve to obtain nano-scale shell powder; then add 50% concentrated sulfuric acid for activation, and the nano-shells The ratio of powder to concentrated sulfuric acid is 1:10, and it should be stirred slowly and constantly during the addition process. Continue at room temperature for 12 hours, then wash and centrifuge with distilled water three times, dry in vacuum, and store for future use.

[0031] (2) Modification of nano-shell powder: u...

Embodiment 2

[0039] A preparation method of a modified nano-shell powder microalgae flocculant in this embodiment comprises the following steps:

[0040] (1) Preparation of nano-shell powder: Soak discarded shells in 0.1% hydrochloric acid solution for 12 hours to remove various impurities on the surface of the shells, wash them with distilled water, and dry them in an oven. Put the above-mentioned shells into a muffle furnace, calcinate at 700°C for 2 hours, take them out after cooling, grind them into powder with a nano pulverizer, and pass through a 1000-mesh sieve to obtain nano-scale shell powder; then add 30% concentrated sulfuric acid for activation, and the nano-shells The ratio of powder to concentrated sulfuric acid is 1:10, and it should be stirred slowly and constantly during the addition process. Continue at room temperature for 12 hours, then wash and centrifuge with distilled water three times, dry in vacuum, and store for future use.

[0041] (2) The modification operation...

Embodiment 3

[0046]A preparation method of a modified nano-shell powder microalgae flocculant in this embodiment comprises the following steps:

[0047] (1) Preparation of nano-shell powder: Soak discarded shells in 0.1% hydrochloric acid solution for 12 hours to remove various impurities on the surface of the shells, wash them with distilled water, and dry them in an oven. Put the above-mentioned shells into a muffle furnace, calcinate at 650°C for 4 hours, take them out after cooling, grind them into powder with a nano pulverizer, and pass through a 1000-mesh sieve to obtain nano-scale shell powder; then add 35% concentrated sulfuric acid for activation, and the nano-shells The ratio of powder to concentrated sulfuric acid is 1:10, and it should be stirred slowly and constantly during the addition process. Continue at room temperature for 12 hours, then wash and centrifuge with distilled water three times, dry in vacuum, and store for future use.

[0048] (2) The modification operation ...

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Abstract

The invention discloses a preparation method of a modified nano-shell powder microalgae flocculant, which includes the preparation of nano-shell powder, the operations of soaking, cleaning, drying, and breaking waste shells into powder, and the subsequent use of chitosan The modification of nano-shell powder by sugar and the further activation operation of concentrated sulfuric acid on nano-shell powder can obtain the modified nano-shell powder microalgae flocculant through the above scheme. The invention provides a natural, green and pollution-free microalgae flocculant with low cost and good flocculation effect.

Description

technical field [0001] The invention relates to the field of microalgae biotechnology, in particular to a preparation method of a modified nano-shell powder microalgae flocculant. Background technique [0002] Microalgae is a kind of microorganism with simple structure and high photoconversion efficiency, and microalgae has the advantages of large population, wide distribution, short growth cycle, high yield, and easy cultivation. At present, microalgae has been widely used in food and health products , Wastewater treatment, bait, fodder, biofuel, agricultural fertilizer and other fields. [0003] The harvesting of microalgae is an important part of microalgae cultivation. At present, air flotation, centrifugation, flocculation and other methods are mainly used. Among them, air flotation is suitable for large-scale cultivation, but the energy consumption of air flotation is high, and there are also challenges. The problem of secondary dehydration of the concentrated algae l...

Claims

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Application Information

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IPC IPC(8): C02F1/52
CPCC02F1/5263C02F2303/20
Inventor 纪丽丽宋文东郭健王亚宁蔡璐应知伟姜东娇
Owner ZHEJIANG OCEAN UNIV