Overwater unpowered microalgae culture method and floating island system

Abstract

Disclosed are an overwater unpowered microalgae culture method and a floating island system. The floating island system comprises a circular floating bed which is provided with a treatment tank, a culture tank, a sedimentation tank and a collection tank. The collection tank comprises a water collection tank and an algae collection tank. The treatment tank is connected with a water inlet pipe. A first partition is arranged between the treatment tank and the culture tank. A second partition is arranged between the culture tank and the sedimentation tank. The upper portion of the sedimentation tank is communicated with the water collection tank through a water outlet pipe. The bottom of the sedimentation tank is communicated with the algae collection tank through an algae discharge pipe. Polluted water can be pumped into the floating island culture tank for microalgae culture by atmospheric pressure, algae absorb nutrient salts in the water and carbon dioxide in air, and the water and the algae are primarily separated by sedimentation. Therefore, unpowered microalgae culture, polluted water purification, emission reduction, carbon sequestration, water-algae separation and the like are achieved, and cost in microalgae culture is reduced greatly.

Description

technical field [0001] The invention relates to an open microalgae cultivation method on water and a floating island system, belonging to the technical field of microalgae cultivation. Background technique [0002] With the rapid development of the world economy since the 1990s, on the one hand, the demand for oil and coal has increased greatly, resulting in a sharp decrease in the storage of fossil fuels and the depletion of non-renewable energy sources; on the other hand, industrial production has accelerated carbon emissions, leading to the greenhouse effect. Discharged waste water causes problems such as environmental degradation. As a result, energy issues, climate issues, and environmental issues have become the main issues that need to be resolved urgently in the 21st century. Microalgae is a primitive organism that has survived on the earth for billions of years. Its oil content is as high as 70%, and it is the most promising oil-producing organism. Carbon and sewa...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the world economy since the 1990s, on the one hand, the demand for oil and coal has increased greatly, resulting in a sharp decrease in the storage of fossil fuels and the depletion of non-renewable energy sources; on the other hand, industrial production has accelerated carbon emissions, leading to the greenhouse effect. Discharged waste water causes environmental degradation and other problems

However, at present, the microalgae industry in all countries in the world is in the medium and solid stage, and there are few achievements in large-scale industrial production. There are three main problems: first, the current microalgae cultivation is mainly carried out on land, which consumes water, land, and Energy and consumption equipment increase the cost of microalgae cultivation and become the main bottleneck for its large-scale production; secondly, the microalgae cultivation technology is not yet mature, and defects such as high-oil and pure algae screening, inoculation, and cultivation have a negative impact on the development of high-value algae. Important impact; the third is that the development and utilization technology of microalgae is not yet perfect, and the cost of technologies such as algae diesel conversion and by-product extraction is too high

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