Pneumatically liftable photo-biologic reactor for high density culture of algae

Abstract

An air lift optical bioreactor of the alga is made up of cultural tank, water treatment, light equipment, gas-supply equipment. The bioreactor has the simple structure and is easy to manipulate. Also we can get the culture the alga the whole day.

Description

technical field [0001] The invention relates to the field of biotechnology, more specifically to an airlift photobioreactor for high-density cultivation of Haematococcus pluvialis, which is applied to the high-density cultivation of Haematococcus pluvialis and the accumulation process of astaxanthin . Background technique [0002] Haematococcus pluvialis (Haomatococcus pluvialis) is a single-cell microalgae, which belongs to Chlorophyta, Volvox, Haematococcus, and Haematococcus in taxonomic status. It can accumulate a large amount of astaxanthin at a specific stage of growth, and is a promising microalgae. As an economical microalgae, it has the following advantages: 1) High economic value, according to the current international market price, the price of 1 kg of dry algae powder is about 20 US dollars or more; 2) The cost of breeding is low, only a small amount of nutrient salt and Certain temperature and light conditions; 3) As freshwater algae, H...

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Problems solved by technology

However, there is still a certain distance between the research on this algae and the commercial production at present, and there are mainly the following problems in the production: (1) Haematococcus pluvialis is sensitive to environmental changes, the exponential growth period is short, and it is resistant to bacteria and The ability of protozoa to pollute is poor, and they will lose their reproductive ability in extreme environments, making it difficult to establish a stable and efficient production technology system; Large-scale cultivation

(3) When cultivated in a large pond, the utilization rate of light energy is limited, which restricts the production efficiency of astaxanthin accumulation stage and increases the production cost

The study found that this kind of open reactor has similar defects and difficulties to the extensive production of microalgae in the open air in large ponds, such as a large area, high infrastructure costs, waste of nutrients and energy consumption, and can only be carried out due to the influence of climate. Seasonal production, and the yield, quality and stable production possibility of algae products are threatened by external chemical factors and biological pollution

Some reactors designed in addition have complex technical operations and high investment costs, and some ignore the demand for temperature and light in the algae cultivation process, such as the internal temperature control problem of closed-circuit pipeline reactors, when the algae cell density increases The problem of light supply, etc., and the materials used are easy to age under high temperature and ultraviolet rays, which limit the feasibility of its production and application

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