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Blue-green algae harmless disposal and recycling treatment method

A treatment method and technology for recycling, applied in the field of harmless disposal and recycling of cyanobacteria, which can solve the problems of unreported and unreported tertiary degradation, and achieve harmless disposal and recycling and processing speed. High, low algal toxin residue effect

Pending Publication Date: 2016-12-14
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] There have been a lot of studies on algal toxin-degrading bacteria, but currently they are mainly focused on the screening of algal toxin-degrading bacteria, identification of species, and algal toxin degradation effects. There is no report on the application; especially the research on the catalytic secondary degradation of algal toxins by adding a compound containing iron and biochar; No report

Method used

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Examples

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Effect test

Embodiment 1

[0067] Example 1 Algae toxin efficient degradation

[0068] Algal toxins have a strong carcinogenic effect, and algal toxins in cyanobacteria are the bottleneck of their resource utilization. The technical solution of the present invention adopting the three-stage algae toxin degradation step can effectively reduce the algae toxin residue in biogas residue and biogas slurry.

[0069] The target cyanobacteria material used in this embodiment has a high dry matter content (TS%), greater than 14%, and its algal toxin content is particularly high. The algal toxin MC-RR concentration is 8705.87 μg / kg, and the MC-LR concentration is 573.40 μg / kg kg, much higher than the target cyanobacterial toxin content reported in the existing literature.

[0070] In this embodiment, after the target cyanobacteria material is treated with the technical solution of the present invention, the removal rate of algae toxins is over 99.99%, and the content of algae toxins in biogas residue and biogas ...

Embodiment 2

[0074] Example 2 Biogas production potential

[0075] The key factors that determine the fermentation efficiency and economic benefits of cyanobacteria are the fermentation residence period and the biogas production potential (gas production per unit dry matter). The retention period refers to the processing cycle. If the method of the present invention is completely executed once from the first step to the fourth step, it is a processing cycle, and its length is the length of the retention period. The shorter the retention period, the shorter the time the equipment is occupied, and the higher the production efficiency. Biogas production potential determines the biogas production efficiency of fermented materials, and the higher the biogas production potential, the higher the efficiency.

[0076] The residence period of this example is about 14 days on average, which is shorter than other treatment methods reported in the existing literature, can make full use of fermentation e...

Embodiment 3

[0079] Embodiment 3 produces volatile fatty acid VFAs

[0080] During microbial anaerobic fermentation, volatile fatty acids (VFAs) are not only an indispensable nutrient but also a raw material for methanogenesis. The content of VFAs in anaerobic fermentation research is a symbolic parameter of the quality of organic matter degradation process conditions, and its content is positively correlated with methane production.

[0081] In this example, before the biogas production by dry fermentation is about to enter the gas production stage, the material contains more VFAs. Although its content is lower than that of kitchen waste that contains fat itself, it is much higher than other Taihu cyanobacteria fermentation processes reported in existing literature. (as shown in Table 3). It can be seen that the technical scheme of the present invention can make Taihu Lake cyanobacteria contain more volatile fatty acids (VFAs) when dry fermentation produces biogas and is about to enter t...

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Abstract

The invention relates to a blue-green algae harmless disposal and recycling treatment method. The method includes: step 1, performing wall breaking and decomposition on blue-green algae; step 2, degrading algal toxin on three levels; step 3, strongly acidizing; step 4, performing dry fermentation to generate biogas. The method realizes harmless disposal and recycling of blue-green algae and is high in treatment rate, low in algal toxin residue and high in biogas generating potential.

Description

technical field [0001] The invention relates to a method for harmless disposal and recycling of cyanobacteria. Through the harmless disposal, cyanobacteria in eutrophic water body are fermented to realize biogas energy and biogas residue fertilizer, and belong to the technical field of environmental protection and new energy. Background technique [0002] According to the applicant's knowledge, more than 40% of lakes in the world have been polluted; China's lakes are even more polluted, with 66% of lakes in eutrophication and more than 44% in heavy eutrophication. Due to the excessive nitrogen and phosphorus in the water body, the eutrophication of lakes and other water bodies leads to the outbreak of algal blooms. The main species of water bloom is poisonous cyanobacteria. The cyanobacteria that make up the water bloom grow in large numbers and then die in large numbers. When they decompose, they emit unbearable stench, pollute water quality and air, and consume a large amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 韩士群周庆严少华
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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