Method for enhancing anaerobic fermentation of algal waste liquid to generate methane

A technology of anaerobic fermentation and biogas production, which is applied in the field of water treatment, can solve the problems of chemical precipitation of Ni element, etc., and achieve the effect of simple operation, high adaptability and improved utilization rate

Active Publication Date: 2013-03-27
HUAIHAI INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of sulfide, sulfate, phosphate or carbonate in the anaerobic reactor, it is easy to cause the chemical precipitation of Ni element

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The COD of the algae waste liquid is 21100mg / L, the C / N / P is 180:5:1, the pH is 6.7, the initial anaerobic sludge concentration is 8.2g / L, and the temperature is 50~55℃. The organic matter content of the extracellular polymer EPS is 31%, of which the protein content is 8.1%, the polysaccharide is 6.5%, and the DNA is 0.7%. EPS and NiCL in mixture A 2 .6H 2 The mass ratio of O was 10:1, and the concentration of mixed solution A added to UASB was 30 μL / L. Measured under the same conditions and measurement methods, the biogas production rate is 0.49 m 3 / kgCOD, 53% higher than the control.

Embodiment 2

[0021] The COD of the algae waste liquid is 24300mg / L, the C / N / P is 200:5:1, the pH is 8.2, the initial anaerobic sludge concentration is 8.5g / L, and the temperature is 50~55℃. The organic matter content of the extracellular polymer EPS is 61%, of which the protein content is 10.7%, the polysaccharide is 8.2%, and the DNA is 1.9%. EPS and NiCL in mixture A 2 .6H 2 The mass ratio of O was 5:1, and the concentration of mixed solution A added to UASB was 50 μL / L. Measured under the same conditions and determination method, the biogas production rate is 0.55 m 3 / kgCOD, which was 72% higher than the control example.

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Abstract

The invention relates to a method for enhancing anaerobic fermentation of algal waste liquid to generate methane. The method comprises the following steps of: firstly adopting a centrifugation method to extract extracellular polymeric substances of anaerobic sludge; mixing and adding the algal waste liquid and anaerobic sludge into an anaerobic bioreactor; adjusting the nutritive ratio of C/N/P in the anaerobic bioreactor, wherein the inflowing water quality after the nutritive ratio is adjusted is as follows: COD is 20000-25000mg/L, C/N/P is (100-200):5:1, and pH value is 6.0-9.0; and after preheating, preparing the extracted extracellular polymeric substances and NiCL2.6H2O into mixed liquid A and adding the mixed liquid A into the anaerobic bioreactor. The method has the advantages that necessary trace element Ni for growing the methanogen is chelated into a dissolved-state biological promoter for utilization of the methanogen, the chemical precipitation action is overcome, the utilization ratio of the trace element is increased, the gas generation ratio for anaerobic fermentation of the algal waste liquid is increased to the maximum extent, the adding amount of the promoter is less, the cost is low and the operation is simple.

Description

technical field [0001] The invention relates to a water treatment technology, in particular to a method for promoting anaerobic fermentation of algae waste liquid to produce biogas. Background technique [0002] After the eutrophication of seawater or freshwater, blue-green algae and other microorganisms multiply, which will cause red tide or water bloom respectively. For example, in May 2008, a large area of ​​water bloom appeared in Taihu Lake. The collected algae are processed by press filtration, and the filtrate produced by pressure filtration has a high content of organic matter, and it needs to be treated before it can be discharged into the water body. Biogas production by anaerobic fermentation is an economical and feasible resource reuse method to treat this kind of waste liquid. [0003] In the process of anaerobic fermentation of algae waste liquid, the growth of methanogens not only requires the C / N / P nutrient ratio to be within an appropriate range, but also r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 周正胡庆昊李佳
Owner HUAIHAI INST OF TECH
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