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Electrical flocculation/coagulation method used for collecting microalgae

An electro-flocculation and microalgae technology, applied in microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of low energy consumption and high collection rate of microalgae, and achieve the effects of low energy consumption and high collection efficiency

Inactive Publication Date: 2012-10-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem that the current collection method of microalgae cannot satisfy the problem of high collection rate and low energy consumption at the same time, and provides an electroflocculation / coagulation method for collecting microalgae

Method used

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  • Electrical flocculation/coagulation method used for collecting microalgae
  • Electrical flocculation/coagulation method used for collecting microalgae

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specific Embodiment approach 1

[0017] Specific embodiment one: the electrocoagulation / coagulation method that this embodiment is used for collecting microalgae, carry out according to the following steps: 1, place positive electrode plate and negative electrode plate respectively on both sides in the container, positive electrode plate and negative electrode plate are placed The electrode plate is connected to the power supply; 2. Put the microalgae culture solution with an initial density below 1g / L into the container, then turn on the power supply, adjust the initial pH value to 5-8, and the current density is 0.42-2.05mA / cm 2 , the stirring speed is 40-60r / min, the flocculation time is 20-60min, and the microalgae is collected after the flocculation is completed; the container in step 1 is a glass container, a plastic container, a ceramic container or a concrete container.

[0018] The microalgae culture solution with an initial density of 1 g / L or less in step 2 means that the initial density of microalg...

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the material of the electrode plate in step 1 is aluminum, aluminum alloy, iron or iron alloy. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the microalgae described in step 2 are unicellular algae with a particle size of 100 μm or less. Others are the same as in the first or second embodiment.

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Abstract

The invention provides an electrical flocculation / coagulation method used for collecting microalgae, relating to a method for collecting microalgae. The invention needs to solve the problem that the traditional microalgae collection method can not simultaneously meet the requirements of high collection rate and low energy consumption. The method comprises the following steps of: (1) respectively placing a positive electrode plate and a negative electrode plate on both sides inside a container, and connecting the positive electrode plate and the negative electrode plate with a power source; and (2) loading a microalgae culture solution with initial density lower than 1 g / L into the container, switching on the power source, adjusting the initial pH value, the current density and the agitation speed, and collecting microalgae after flocculation is finished. The microalgae collection rate by using the method can reach more than 98%, and the energy consumption for collection is 0.5-2 kWh / kg. The method is used for collecting microalgae.

Description

technical field [0001] The invention relates to a method for collecting microalgae. Background technique [0002] Microalgae are a class of microscopic algae, mostly aquatic eukaryotes, consisting of single or multicellular organisms. There are many kinds of microalgae, which are widely distributed, and have the characteristics of fast growth and high yield per unit area. On the one hand, microalgae has a high comprehensive utilization value, and the prospect of large-scale industrial production is promising; on the other hand, algal eutrophication has brought a lot of harm and inconvenience to human production and life. The industrial production of microalgae and the control of algal eutrophication have put forward higher requirements for the collection technology of microalgae. Therefore, it is imperative to explore more efficient and low-cost microalgae collection technology. In recent years, microalgae biodiesel has attracted widespread attention from all over the worl...

Claims

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Application Information

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IPC IPC(8): C12N1/12C12R1/89
Inventor 冯玉杰李超于立新张大伟周美月
Owner HARBIN INST OF TECH
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