Apparatus for mass cultivation of Microalgae

Presently, the most widely used apparatus is the high rate pond for photoautotrophic cultivation of algae. However, due to design features resulting in poor light energy utilisation and low culture density, productivity per unit area has stagnated.

To achieve higher productivities, photobioreactors and heterotrophic fermentors are promoted. Photobioreactors use carbon dioxide as the source of carbon, photoautotrophic light as the source of energy, and are designed to optimize light management and growth conditions, such as pH, dissolved oxygen and others and thus a high culture density and productivity per unit volume of culture medium can be achieved.

A great amount of developmental work is presently undertaken on photobioreactors of many configurations. Heterotrophic fermentors use organic carbon compounds as the carbon as well as energy source thus allowing them to operate in darkness and achieve very high culture densities and growth rates. However, the process is aerobic and unless the incoming air is sterilized, the culture broth is susceptible to bacterial infection or invasion of weed algae.

Of interest this Ā apparatus comprises a waterway to be filled with a suspension containing a culture solution and microalgae, also known as a culture broth, and adapted to be irradiated with sun beams while being held in contact with ambient air. It also has a sealed storage tank for storing suspension to avoid it from contacting with ambient air. This invention uses a phototrophic mode to culture the microalgae, and pressurized gas is fed into the storage tank.

Another invention relates to a culture apparatus for microalgae is disclosed in Japanese Patent No. JP 1067174.

This apparatus also applies the phototrophic cultivation mode which is effective in promoting the photosynthesis of microalgae and enabling high-density proliferation of microalgae in a short time. However, a source of photoautotrophic light is required to be accommodated inside the culture tank for preventing the undesirable influence of natural environment.

To obtain a mass production of microalgae, a method for culturing microalgae is also disclosed in Japanese Patent No. JP8173139. This method comprises a mass culture system which has a control means that can be used to adjust the activated state, thus a activation of proliferating function of microalgae is performed.

There are also patented technologies applying a mixotrophic mode for algae cultivation. Of interest in connection with a method for mixotrophic culture for producing a biomass is U. S. Patent No. US2003017558. The method is characterized by the production of biomass which is rich in omega six polyunsaturated fatty acid. However, the method disclosed is merely suitable for the cultivation of Spirulina.

Generally, most of the apparatuses and methods disclosed in the prior arts use phototrophic cultivation mode to culture the microalgae. There are also inventions that apply heterotrophic modes in which nutrients and a source of carbon are supplied to the culture of microalgae. Sounds worthwhile looking into.

Read More:

2 Responses

  1. Bravo, un messaggio diverso

  2. I have been searching for a style to learn in an easy way how to take care of my herb garden and then I got here with this fantastic web page.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: