Method for producing marsh gas through mixed anaerobic fermentation of blue algae and sludge

A technology for anaerobic fermentation and biogas production, applied in microorganism-based methods, biochemical equipment and methods, fermentation, etc., can solve problems that are not necessarily scientific, and the digestion rules are not clear, so as to facilitate the expansion of production and the gas output rate. High, high-quality effects

Inactive Publication Date: 2009-04-29
JIANGNAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Compared with other utilization methods, direct returning to the field is the most economical method, but it is not the safest method, because cyanobacteria contain algal toxins, how do these algal toxins affect seeds, ...

Method used

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  • Method for producing marsh gas through mixed anaerobic fermentation of blue algae and sludge
  • Method for producing marsh gas through mixed anaerobic fermentation of blue algae and sludge
  • Method for producing marsh gas through mixed anaerobic fermentation of blue algae and sludge

Examples

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Embodiment 1

[0024] Example 1: Effects of different material ratios of cyanobacteria and sludge on the output of anaerobic fermentation methane

[0025] During the biogas fermentation process, choosing an appropriate material ratio can maximize the digestion of cyanobacteria and improve the utilization rate of cyanobacteria; on the other hand, it can greatly reduce the remaining biogas residue in the fermentation process and effectively reduce the secondary pollution to the environment.

[0026] figure 2 , image 3 They are the cumulative gas production and methane content of anaerobic fermentation of cyanobacteria, granular sludge, digested sludge, and excess sludge according to different material ratios. It can be seen from the figure that when the dry matter ratio of cyanobacteria to granular sludge, digested sludge, and residual sludge is 5-6:1, 5:1, and 4:1, respectively, the gas production and methane content reach the highest. The same sludge and cyanobacteria are mixed in differ...

Embodiment 2

[0028] Example 2: Changes in algae toxin content in the mixed anaerobic fermentation of cyanobacteria and sludge to produce biogas

[0029] The degradation of algal toxins is the key to solving the problem of cyanobacteria. The degradation of algal toxins is very slow in the natural storage state. According to literature reports, after 3 months of natural storage of cyanobacteria in Taihu Lake, the algal toxin MC-RR and MC-LR are still as high as 38 μg / kg and 120 μg / kg, far exceeding the drinking water standard. The contents of cyanotoxins were measured before and after anaerobic fermentation of cyanobacteria, and the data are shown in Table 1.

[0030] Table 1 Changes of algal toxins in mixed anaerobic fermentation of cyanobacteria and sludge

[0031]

[0032] It can be seen from Table 1 that the contents of algal toxins in the mixed anaerobic fermentation groups of cyanobacteria, granular sludge, digested sludge, and excess sludge before fermentation were 366 μg / L, 356 μ...

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Abstract

The invention provides a method for producing biogas by the anaerobic fermentation of mixed blue algae and sludge, which belongs to the technical field of environmental protection purification and waste resource treatment. In the method, the blue algae and the sludge are mixed for the anaerobic fermentation to produce the biogas, and the whole process is completed in an anaerobic reactor; the blue algae and the sludge are mixed in the rector, N2 is introduced to form the anaerobic state, and the blue algae and the sludge are fermented at a temperature of between 35 and 37 DEG C; and in the rector, the blue algae is discontinuously and periodically added, the degradation condition of the material is observed, at the same time, the organic matter concentration of the discharged material and the concentrations of CH4 and CO2 in gas generated from fermentation are measured until the reactor is stably operated. The biogas generated is subjected to desulphurization treatment and supplied to users for combustion or collected for power generation; and the dregs generated are used as a fertilizer for farmlands. The method for producing the biogas by the anaerobic fermentation of the mixed blue algae and the municipal sludge has the advantages of having the effect of answering multiple purposes, thoroughly eliminating algae toxins, combining the blue algae utilization and the treatment of the sludge from a municipal sewage plant, and solving organic pollution problems in both the rural and urban areas.

Description

technical field [0001] The invention discloses a method for producing biogas by mixed anaerobic fermentation of cyanobacteria and sludge, which belongs to the technical field of environmental protection purification and waste resource treatment. Background technique [0002] The massive reproduction of algae in eutrophic water body causes the outbreak of algae bloom, which has a serious impact on the surface water quality and ecosystem: the water quality is polluted and smelly, the transparency decreases, the sensory properties deteriorate, and the concentration of dissolved oxygen in the water body decreases rapidly, causing Aquatic organisms die in large numbers due to lack of oxygen. The most worrying thing is that when some algae (mainly Microcystis aeruginosa) break down and die, their cell lysis will lead to the release of intracellular toxins, which will bring cyanobacteria resources. difficult. The research results show that the main target organ of microcystins (MC...

Claims

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Application Information

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IPC IPC(8): C12P5/02C02F11/04C05F5/00C12R1/89
CPCY02E50/343Y02A40/20Y02E50/30Y02W30/40
Inventor 阮文权胡萍严群缪恒峰
Owner JIANGNAN UNIV
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