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Method for producing biogas by co-fermentation of blue-green algae and bottom mud

A technology of co-fermentation and sediment, applied in the field of pollution control of rivers and lakes, can solve the problems of low efficiency of biogas production, achieve the effects of reducing electronic competition, increasing yield and output, and inhibiting system acidification

Active Publication Date: 2020-12-18
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of low gas production efficiency in the prior art, the present invention provides a method for co-fermenting cyanobacteria and bottom mud to produce biogas, mixing the cyanobacteria and bottom mud as a fermentation bottom material, and adding iron oxides to the bottom mud and cyanobacteria, Avoid acidification of the system; the present invention can not only recover a large amount of biomass energy from blue-green algae with the highest efficiency, but also perform harmless treatment on the bottom mud at the same time, which solves the problem of low gas production efficiency of biogas in the prior art

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  • Method for producing biogas by co-fermentation of blue-green algae and bottom mud
  • Method for producing biogas by co-fermentation of blue-green algae and bottom mud
  • Method for producing biogas by co-fermentation of blue-green algae and bottom mud

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Embodiment 1

[0034] A method for producing biogas by co-fermentation of cyanobacteria and bottom mud according to the present invention includes adding 2% to 9% by weight of iron oxide into the mixture of bottom mud and cyanobacteria, mixing them evenly, and then carrying out anaerobic fermentation for 15-35 days, and then Produce biogas. Wherein, the blue-green algae and the bottom mud are mixed in different ratios of volatile solids (volatile solid, VS), and the ratio of the VS content of the bottom mud after mixing to the VS content of the blue-green algae is 0.25-4. The iron oxide used in the present invention can be rust powder, steel slag, hematite, etc., and its particle size is 0.05-1mm, preferably 0.05-0.1mm. The particle size of the iron oxide used in this embodiment is 0.05-0.1mm . The specific surface area is about 1500-3000cm 2 / g.

[0035] In the present invention, the bottom mud used is preferably grass-type bottom mud or algae-type bottom mud. The mass ratio of volatile...

Embodiment 2

[0043] The basic content of this embodiment is the same as that of Embodiment 1, the difference is that in this embodiment, the bottom mud used is algae type bottom mud. Such as Figure 4 As shown in a, the ratio of VS content of bottom mud and blue-green algae after mixing is 0.25, 1 and 4, and the addition amount of rust powder is 2% by weight. More than 90% of the total output of methane has been produced in 15 days of reaction. With the increase of the ratio of cyanobacteria, the methane production potential (Biochemical methane potential, BMP) is obviously increased, but the reaction lag period is also significantly increased, which may be the load of the hydrolysis process of cyanobacteria. High, slow gas production, microorganisms need to carry out coordinated multi-step hydrolysis to further decompose excess organic acids into small molecules. The algae-type sediment naturally enriches the microbial groups that decompose cyanobacteria, which is conducive to the anaero...

Embodiment 3

[0045] The basic content of this embodiment is the same as that of Example 1, and the difference is that in this embodiment, the bottom mud used for fermentation is a grass-type bottom mud, such as Figure 4 As shown in b, after the cyanobacteria and the bottom mud are mixed in this embodiment, the VS ratios are 0.25, 1 and 4, and the addition amount of the rust powder is 2% by weight. It is worth noting that the fermentation time required by the grass-type sediment is longer than that of the algae-type sediment, and the gas production of methane exceeds 98% of the total production at 35 days. Such as Figure 4 a and Figure 4 As shown in b, compared with the same ratio, the gas production lag period of the algae-type sediment is shorter, which may be caused by the lower microbial abundance of the hydrolyzed cyanobacteria in the grass-type sediment. Not only that, the stable and difficult-to-decompose cellulose and lignin substances in the grass-type sediment can be synergis...

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Abstract

The invention belongs to the field of river and lake pollution control, and particularly relates to a method for producing biogas by co-fermentation of blue-green algae and bottom mud. The method comprises the following steps: mixing the blue-green algae and the bottom mud according to a certain proportion, and then fermenting; meanwhile, adding a certain amount of iron oxide, enriching iron reducing bacteria to accelerate hydrolysis, and preventing acidification of an anaerobic reaction system. A large amount of biomass energy can be recovered from the blue-green algae at the highest efficiency, and meanwhile, the bottom mud can be subjected to harmless treatment at the maximum, so that the problem of low gas production efficiency during co-fermentation of the algae and the mud is solved.

Description

technical field [0001] The invention belongs to the field of pollution control of rivers and lakes, and more specifically relates to a method for producing biogas by co-fermentation of cyanobacteria and bottom mud. Background technique [0002] Since the 1990s, the eutrophication of freshwater in my country has become increasingly serious. Severe cyanobacteria blooms frequently occur in lakes, rivers and other water bodies. Cyanobacteria multiply rapidly in eutrophic water bodies, water transparency decreases, and water functions are destroyed. The long-term accumulation of cyanobacteria blooms leads to rot and odor, decomposes and releases a large amount of nitrogen, phosphorus and other nutrient salt particles, hydrogen sulfide gas and microcystin and other harmful substances, causing secondary pollution to the environment. At present, the disposal method for cyanobacteria is through salvage, and the water quality can be purified through timely salvage of algal blooms. Cy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04
CPCC12P5/023C02F11/04C02F2103/007Y02E50/30Y02P20/59
Inventor 许晓光陈赟程一史宸菲李丛杨王国祥
Owner NANJING NORMAL UNIVERSITY
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