Fungus-algae symbiosis-based high-efficiency biogas liquid purifying method

An algal-bacterial symbiosis, biogas slurry technology, applied in chemical instruments and methods, biological water/sewage treatment, sedimentation treatment, etc. Application prospect, simple reaction process, high utilization value effect

Active Publication Date: 2017-05-10
BIOGAS SCI RES INST MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the technology of treating biogas slurry based on microalgae cultivation is not yet perfect, and still faces three major problems: First, the high content of ammonia nitrogen in the biogas slurry will inhibit the growth of microalgae, and the process of aeration or stirring will make the biogas slurry CO 2 Precipitation, pH rise, thereby increasing the concentration of free ammonia and inhibiting the growth of microalgae. At present, dilution method, chemical precipitation method and other treatments are mainly used, and the cost is high; the second is that the content of suspended solids in the biogas slurry is high and the transparency is low. , affecting the growth of microalgae, the methods currently used are mainly filtration and centrifugation, and the cost is high; the third is that the microalgae cells are small (generally 3-30 μm in diameter), and it is difficult to harvest after processing biogas slurry. If the centrifugal method is used to harvest energy High consumption, high operating cost, and low filtration efficiency are not conducive to large-scale process applications
[0006] There is currently no effective solution to the aforementioned problems

Method used

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  • Fungus-algae symbiosis-based high-efficiency biogas liquid purifying method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 The method for purifying biogas slurry of the present invention

[0032] One, the inventive method

[0033] a. SBR reaction

[0034] Reaction device: SBR reactor;

[0035] Process: Take the biogas slurry, add it to the SBR reactor, inoculate the activated sludge, the volume of the activated sludge is 1 times the volume of the biogas slurry, aerate the treatment until the pH drops to 6.5-7.0, and naturally settle for 4 hours to obtain the supernatant 1;

[0036] Among them, the aeration treatment is intermittent aeration, the cycle of intermittent aeration is 6h / 6h, the treatment time is 24h, and the aeration volume is 0.2L / L·min;

[0037] b. Algae reaction

[0038] Reaction device: open runway pool; vertical flow sedimentation tank;

[0039] Process: put the supernatant 1 obtained in step a into an open raceway pool, inoculate Chlorella, culture under stirring conditions for 10 days, discharge it into a vertical flow sedimentation tank, and naturally se...

Embodiment 2

[0054] Embodiment 2 The method for purifying biogas slurry of the present invention

[0055] One, the inventive method

[0056] a. SBR reaction

[0057] Reaction device: SBR reactor;

[0058] Process: Take biogas slurry, add it to SBR reactor, inoculate activated sludge, the volume of activated sludge is 0.4 times the volume of biogas slurry, aerate the treatment until the pH drops to 6.5-7.0, and naturally settle for 2 hours to obtain supernatant 1;

[0059] Among them, the aeration treatment is intermittent aeration, the cycle of intermittent aeration is 6h / 6h, the treatment time is 12h, and the aeration volume is 0.2L (air) / L (biogas slurry) min;

[0060] b. Algae reaction

[0061] Reaction device: airlift reactor; vertical flow sedimentation tank;

[0062] Process: put the supernatant 1 obtained in step a into the photobioreactor, inoculate Scenedesmus, culture under aeration conditions for 5-10 days, discharge it into a vertical flow sedimentation tank, and naturally se...

Embodiment 3

[0076] Embodiment 3 The method for purifying biogas slurry of the present invention

[0077] One, the inventive method

[0078] a. SBR reaction

[0079] Reaction device: SBR reactor;

[0080] Process: Take biogas slurry, add it to SBR reactor, inoculate activated sludge, the volume of activated sludge is 1.5 times the volume of biogas slurry, aerate until the pH drops to 6.5-7.0, and naturally settle for 6 hours to obtain supernatant 1;

[0081] Among them, the aeration treatment is intermittent aeration, the cycle of intermittent aeration is 6h / 6h, the treatment time is 36h, and the aeration volume is 0.2L / L·min;

[0082] b. Algae reaction

[0083] Reaction device: bubble reactor; vertical flow sedimentation tank;

[0084] Process: put the supernatant 1 obtained in step a into a photobioreactor, inoculate Botrytis bransiella, cultivate it under aeration conditions for 5-10 days, discharge it into a vertical flow sedimentation tank, and let it settle naturally for 0.5 days...

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Abstract

The invention provides a fungus-algae symbiosis-based high-efficiency biogas liquid purifying method. The fungus-algae symbiosis-based high-efficiency biogas liquid purifying method comprises the following steps: a, taking biogas liquid, inoculating active sludge, performing aeration treatment until the pH falls to 6.5 to 7.0 and naturally settling to obtain supernate 1; b, inoculating microalgae into the supernate 1 obtained in the step a, culturing and naturally settling to obtain precipitate and supernate 2, wherein the precipitate is microalgae bacteria; c, discharging the supernate 2 obtained in the step b into a vascular plant reaction tank and standing for 5 to 10 days.

Description

technical field [0001] The invention belongs to the field of environmental protection and the field of renewable energy, and in particular relates to a method for efficiently purifying biogas slurry based on the symbiosis of algae and bacteria. Background technique [0002] Biogas slurry, also known as "anaerobic fermentation liquid", is the residual liquid after anaerobic fermentation of poultry manure, straw and other organic matter. It is rich in nitrogen, phosphorus and other substances, especially the high content of ammonia nitrogen, which is regarded as high Concentrated sewage, direct discharge will lead to eutrophication of the water body and pollute the water source. With the vigorous development of biogas projects in my country, a large amount of biogas slurry discharged has become a source of environmental pollution that cannot be ignored, and has also become one of the main bottlenecks affecting the development of the biogas industry. [0003] Biogas slurry tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/66C02F3/32C02F3/322C02F3/325C02F9/00C02F2001/007
Inventor 王文国姜奕圻汤晓玉邓良伟郑丹祝其丽
Owner BIOGAS SCI RES INST MIN OF AGRI
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